Add -name option, by Anthony Liguori.
[qemu] / linux-user / syscall.c
index b2965bb..5eb5b39 100644 (file)
 #include <fcntl.h>
 #include <time.h>
 #include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/msg.h>
 #include <sys/wait.h>
 #include <sys/time.h>
 #include <sys/stat.h>
 #include <sys/mount.h>
+#include <sys/prctl.h>
 #include <sys/resource.h>
 #include <sys/mman.h>
 #include <sys/swap.h>
@@ -42,6 +45,8 @@
 #include <sys/poll.h>
 #include <sys/times.h>
 #include <sys/shm.h>
+#include <sys/sem.h>
+#include <sys/statfs.h>
 #include <utime.h>
 #include <sys/sysinfo.h>
 //#include <sys/user.h>
@@ -68,7 +73,8 @@
 
 //#define DEBUG
 
-#if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SPARC)
+#if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SPARC) \
+    || defined(TARGET_M68K)
 /* 16 bit uid wrappers emulation */
 #define USE_UID16
 #endif
 #define        VFAT_IOCTL_READDIR_SHORT        _IOR('r', 2, struct dirent [2])
 
 
-#if defined(__powerpc__)
-#undef __syscall_nr
-#undef __sc_loadargs_0
-#undef __sc_loadargs_1
-#undef __sc_loadargs_2
-#undef __sc_loadargs_3
-#undef __sc_loadargs_4
-#undef __sc_loadargs_5
-#undef __sc_asm_input_0
-#undef __sc_asm_input_1
-#undef __sc_asm_input_2
-#undef __sc_asm_input_3
-#undef __sc_asm_input_4
-#undef __sc_asm_input_5
 #undef _syscall0
 #undef _syscall1
 #undef _syscall2
 #undef _syscall3
 #undef _syscall4
 #undef _syscall5
+#undef _syscall6
 
-/* need to redefine syscalls as Linux kernel defines are incorrect for
-   the clobber list */
-/* On powerpc a system call basically clobbers the same registers like a
- * function call, with the exception of LR (which is needed for the
- * "sc; bnslr" sequence) and CR (where only CR0.SO is clobbered to signal
- * an error return status).
- */
+#define _syscall0(type,name)           \
+type name (void)                       \
+{                                      \
+       return syscall(__NR_##name);    \
+}
 
-#define __syscall_nr(nr, type, name, args...)                          \
-       unsigned long __sc_ret, __sc_err;                               \
-       {                                                               \
-               register unsigned long __sc_0  __asm__ ("r0");          \
-               register unsigned long __sc_3  __asm__ ("r3");          \
-               register unsigned long __sc_4  __asm__ ("r4");          \
-               register unsigned long __sc_5  __asm__ ("r5");          \
-               register unsigned long __sc_6  __asm__ ("r6");          \
-               register unsigned long __sc_7  __asm__ ("r7");          \
-                                                                       \
-               __sc_loadargs_##nr(name, args);                         \
-               __asm__ __volatile__                                    \
-                       ("sc           \n\t"                            \
-                        "mfcr %0      "                                \
-                       : "=&r" (__sc_0),                               \
-                         "=&r" (__sc_3),  "=&r" (__sc_4),              \
-                         "=&r" (__sc_5),  "=&r" (__sc_6),              \
-                         "=&r" (__sc_7)                                \
-                       : __sc_asm_input_##nr                           \
-                       : "cr0", "ctr", "memory",                       \
-                         "r8", "r9", "r10","r11", "r12");              \
-               __sc_ret = __sc_3;                                      \
-               __sc_err = __sc_0;                                      \
-       }                                                               \
-       if (__sc_err & 0x10000000)                                      \
-       {                                                               \
-               errno = __sc_ret;                                       \
-               __sc_ret = -1;                                          \
-       }                                                               \
-       return (type) __sc_ret
-
-#define __sc_loadargs_0(name, dummy...)                                        \
-       __sc_0 = __NR_##name
-#define __sc_loadargs_1(name, arg1)                                    \
-       __sc_loadargs_0(name);                                          \
-       __sc_3 = (unsigned long) (arg1)
-#define __sc_loadargs_2(name, arg1, arg2)                              \
-       __sc_loadargs_1(name, arg1);                                    \
-       __sc_4 = (unsigned long) (arg2)
-#define __sc_loadargs_3(name, arg1, arg2, arg3)                                \
-       __sc_loadargs_2(name, arg1, arg2);                              \
-       __sc_5 = (unsigned long) (arg3)
-#define __sc_loadargs_4(name, arg1, arg2, arg3, arg4)                  \
-       __sc_loadargs_3(name, arg1, arg2, arg3);                        \
-       __sc_6 = (unsigned long) (arg4)
-#define __sc_loadargs_5(name, arg1, arg2, arg3, arg4, arg5)            \
-       __sc_loadargs_4(name, arg1, arg2, arg3, arg4);                  \
-       __sc_7 = (unsigned long) (arg5)
-
-#define __sc_asm_input_0 "0" (__sc_0)
-#define __sc_asm_input_1 __sc_asm_input_0, "1" (__sc_3)
-#define __sc_asm_input_2 __sc_asm_input_1, "2" (__sc_4)
-#define __sc_asm_input_3 __sc_asm_input_2, "3" (__sc_5)
-#define __sc_asm_input_4 __sc_asm_input_3, "4" (__sc_6)
-#define __sc_asm_input_5 __sc_asm_input_4, "5" (__sc_7)
-
-#define _syscall0(type,name)                                           \
-type name(void)                                                                \
-{                                                                      \
-       __syscall_nr(0, type, name);                                    \
+#define _syscall1(type,name,type1,arg1)                \
+type name (type1 arg1)                         \
+{                                              \
+       return syscall(__NR_##name, arg1);      \
 }
 
-#define _syscall1(type,name,type1,arg1)                                        \
-type name(type1 arg1)                                                  \
-{                                                                      \
-       __syscall_nr(1, type, name, arg1);                              \
+#define _syscall2(type,name,type1,arg1,type2,arg2)     \
+type name (type1 arg1,type2 arg2)                      \
+{                                                      \
+       return syscall(__NR_##name, arg1, arg2);        \
 }
 
-#define _syscall2(type,name,type1,arg1,type2,arg2)                     \
-type name(type1 arg1, type2 arg2)                                      \
-{                                                                      \
-       __syscall_nr(2, type, name, arg1, arg2);                        \
+#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)  \
+type name (type1 arg1,type2 arg2,type3 arg3)                   \
+{                                                              \
+       return syscall(__NR_##name, arg1, arg2, arg3);          \
 }
 
-#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)          \
-type name(type1 arg1, type2 arg2, type3 arg3)                          \
-{                                                                      \
-       __syscall_nr(3, type, name, arg1, arg2, arg3);                  \
+#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)       \
+type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4)                                \
+{                                                                              \
+       return syscall(__NR_##name, arg1, arg2, arg3, arg4);                    \
 }
 
-#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
-type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4)              \
-{                                                                      \
-       __syscall_nr(4, type, name, arg1, arg2, arg3, arg4);            \
+#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,       \
+                 type5,arg5)                                                   \
+type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5)             \
+{                                                                              \
+       return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5);              \
 }
 
-#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \
-type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5)  \
-{                                                                      \
-       __syscall_nr(5, type, name, arg1, arg2, arg3, arg4, arg5);      \
+
+#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,       \
+                 type5,arg5,type6,arg6)                                        \
+type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5,type6 arg6)  \
+{                                                                              \
+       return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5, arg6);        \
 }
-#endif
+
 
 #define __NR_sys_uname __NR_uname
 #define __NR_sys_getcwd1 __NR_getcwd
-#define __NR_sys_statfs __NR_statfs
-#define __NR_sys_fstatfs __NR_fstatfs
 #define __NR_sys_getdents __NR_getdents
 #define __NR_sys_getdents64 __NR_getdents64
 #define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo
+#define __NR_sys_syslog __NR_syslog
 
 #if defined(__alpha__) || defined (__ia64__) || defined(__x86_64__)
 #define __NR__llseek __NR_lseek
@@ -225,12 +162,14 @@ _syscall3(int, sys_getdents, uint, fd, struct dirent *, dirp, uint, count);
 _syscall3(int, sys_getdents64, uint, fd, struct dirent64 *, dirp, uint, count);
 _syscall5(int, _llseek,  uint,  fd, ulong, hi, ulong, lo,
           loff_t *, res, uint, wh);
-_syscall2(int,sys_statfs,const char *,path,struct kernel_statfs *,buf)
-_syscall2(int,sys_fstatfs,int,fd,struct kernel_statfs *,buf)
 _syscall3(int,sys_rt_sigqueueinfo,int,pid,int,sig,siginfo_t *,uinfo)
+_syscall3(int,sys_syslog,int,type,char*,bufp,int,len)
 #ifdef __NR_exit_group
 _syscall1(int,exit_group,int,error_code)
 #endif
+#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
+_syscall1(int,set_tid_address,int *,tidptr)
+#endif
 
 extern int personality(int);
 extern int flock(int, int);
@@ -255,44 +194,43 @@ static inline int is_error(long ret)
     return (unsigned long)ret >= (unsigned long)(-4096);
 }
 
-static char *target_brk;
-static char *target_original_brk;
+static target_ulong target_brk;
+static target_ulong target_original_brk;
 
-void target_set_brk(char *new_brk)
+void target_set_brk(target_ulong new_brk)
 {
-    target_brk = new_brk;
-    target_original_brk = new_brk;
+    target_original_brk = target_brk = new_brk;
 }
 
-static long do_brk(char *new_brk)
+long do_brk(target_ulong new_brk)
 {
-    char *brk_page;
+    target_ulong brk_page;
     long mapped_addr;
     int        new_alloc_size;
 
     if (!new_brk)
-        return (long)target_brk;
+        return target_brk;
     if (new_brk < target_original_brk)
         return -ENOMEM;
     
-    brk_page = (char *)HOST_PAGE_ALIGN((unsigned long)target_brk);
+    brk_page = HOST_PAGE_ALIGN(target_brk);
 
     /* If the new brk is less than this, set it and we're done... */
     if (new_brk < brk_page) {
        target_brk = new_brk;
-       return (long)target_brk;
+       return target_brk;
     }
 
     /* We need to allocate more memory after the brk... */
     new_alloc_size = HOST_PAGE_ALIGN(new_brk - brk_page + 1);
-    mapped_addr = get_errno(target_mmap((unsigned long)brk_page, new_alloc_size, 
+    mapped_addr = get_errno(target_mmap(brk_page, new_alloc_size, 
                                         PROT_READ|PROT_WRITE,
                                         MAP_ANON|MAP_FIXED|MAP_PRIVATE, 0, 0));
     if (is_error(mapped_addr)) {
        return mapped_addr;
     } else {
        target_brk = new_brk;
-       return (long)target_brk;
+       return target_brk;
     }
 }
 
@@ -357,9 +295,12 @@ static inline long host_to_target_clock_t(long ticks)
 #endif
 }
 
-static inline void host_to_target_rusage(struct target_rusage *target_rusage, 
+static inline void host_to_target_rusage(target_ulong target_addr,
                                          const struct rusage *rusage)
 {
+    struct target_rusage *target_rusage;
+
+    lock_user_struct(target_rusage, target_addr, 0);
     target_rusage->ru_utime.tv_sec = tswapl(rusage->ru_utime.tv_sec);
     target_rusage->ru_utime.tv_usec = tswapl(rusage->ru_utime.tv_usec);
     target_rusage->ru_stime.tv_sec = tswapl(rusage->ru_stime.tv_sec);
@@ -378,35 +319,64 @@ static inline void host_to_target_rusage(struct target_rusage *target_rusage,
     target_rusage->ru_nsignals = tswapl(rusage->ru_nsignals);
     target_rusage->ru_nvcsw = tswapl(rusage->ru_nvcsw);
     target_rusage->ru_nivcsw = tswapl(rusage->ru_nivcsw);
+    unlock_user_struct(target_rusage, target_addr, 1);
 }
 
-static inline void target_to_host_timeval(struct timeval *tv, 
-                                          const struct target_timeval *target_tv)
+static inline void target_to_host_timeval(struct timeval *tv,
+                                          target_ulong target_addr)
 {
+    struct target_timeval *target_tv;
+
+    lock_user_struct(target_tv, target_addr, 1);
     tv->tv_sec = tswapl(target_tv->tv_sec);
     tv->tv_usec = tswapl(target_tv->tv_usec);
+    unlock_user_struct(target_tv, target_addr, 0);
 }
 
-static inline void host_to_target_timeval(struct target_timeval *target_tv, 
+static inline void host_to_target_timeval(target_ulong target_addr,
                                           const struct timeval *tv)
 {
+    struct target_timeval *target_tv;
+
+    lock_user_struct(target_tv, target_addr, 0);
     target_tv->tv_sec = tswapl(tv->tv_sec);
     target_tv->tv_usec = tswapl(tv->tv_usec);
+    unlock_user_struct(target_tv, target_addr, 1);
 }
 
 
 static long do_select(long n, 
-                      target_long *target_rfds, target_long *target_wfds, 
-                      target_long *target_efds, struct target_timeval *target_tv)
+                      target_ulong rfd_p, target_ulong wfd_p, 
+                      target_ulong efd_p, target_ulong target_tv)
 {
     fd_set rfds, wfds, efds;
     fd_set *rfds_ptr, *wfds_ptr, *efds_ptr;
+    target_long *target_rfds, *target_wfds, *target_efds;
     struct timeval tv, *tv_ptr;
     long ret;
+    int ok;
 
-    rfds_ptr = target_to_host_fds(&rfds, target_rfds, n);
-    wfds_ptr = target_to_host_fds(&wfds, target_wfds, n);
-    efds_ptr = target_to_host_fds(&efds, target_efds, n);
+    if (rfd_p) {
+        target_rfds = lock_user(rfd_p, sizeof(target_long) * n, 1);
+        rfds_ptr = target_to_host_fds(&rfds, target_rfds, n);
+    } else {
+        target_rfds = NULL;
+        rfds_ptr = NULL;
+    }
+    if (wfd_p) {
+        target_wfds = lock_user(wfd_p, sizeof(target_long) * n, 1);
+        wfds_ptr = target_to_host_fds(&wfds, target_wfds, n);
+    } else {
+        target_wfds = NULL;
+        wfds_ptr = NULL;
+    }
+    if (efd_p) {
+        target_efds = lock_user(efd_p, sizeof(target_long) * n, 1);
+        efds_ptr = target_to_host_fds(&efds, target_efds, n);
+    } else {
+        target_efds = NULL;
+        efds_ptr = NULL;
+    }
             
     if (target_tv) {
         target_to_host_timeval(&tv, target_tv);
@@ -415,7 +385,9 @@ static long do_select(long n,
         tv_ptr = NULL;
     }
     ret = get_errno(select(n, rfds_ptr, wfds_ptr, efds_ptr, tv_ptr));
-    if (!is_error(ret)) {
+    ok = !is_error(ret);
+
+    if (ok) {
         host_to_target_fds(target_rfds, rfds_ptr, n);
         host_to_target_fds(target_wfds, wfds_ptr, n);
         host_to_target_fds(target_efds, efds_ptr, n);
@@ -424,25 +396,41 @@ static long do_select(long n,
             host_to_target_timeval(target_tv, &tv);
         }
     }
+    if (target_rfds)
+        unlock_user(target_rfds, rfd_p, ok ? sizeof(target_long) * n : 0);
+    if (target_wfds)
+        unlock_user(target_wfds, wfd_p, ok ? sizeof(target_long) * n : 0);
+    if (target_efds)
+        unlock_user(target_efds, efd_p, ok ? sizeof(target_long) * n : 0);
+
     return ret;
 }
 
 static inline void target_to_host_sockaddr(struct sockaddr *addr,
-                                           struct target_sockaddr *target_addr,
+                                           target_ulong target_addr,
                                            socklen_t len)
 {
-    memcpy(addr, target_addr, len);
-    addr->sa_family = tswap16(target_addr->sa_family);
+    struct target_sockaddr *target_saddr;
+
+    target_saddr = lock_user(target_addr, len, 1);
+    memcpy(addr, target_saddr, len);
+    addr->sa_family = tswap16(target_saddr->sa_family);
+    unlock_user(target_saddr, target_addr, 0);
 }
 
-static inline void host_to_target_sockaddr(struct target_sockaddr *target_addr,
+static inline void host_to_target_sockaddr(target_ulong target_addr,
                                            struct sockaddr *addr,
                                            socklen_t len)
 {
-    memcpy(target_addr, addr, len);
-    target_addr->sa_family = tswap16(addr->sa_family);
+    struct target_sockaddr *target_saddr;
+
+    target_saddr = lock_user(target_addr, len, 0);
+    memcpy(target_saddr, addr, len);
+    target_saddr->sa_family = tswap16(addr->sa_family);
+    unlock_user(target_saddr, target_addr, len);
 }
 
+/* ??? Should this also swap msgh->name?  */
 static inline void target_to_host_cmsg(struct msghdr *msgh,
                                        struct target_msghdr *target_msgh)
 {
@@ -460,7 +448,7 @@ static inline void target_to_host_cmsg(struct msghdr *msgh,
         space += CMSG_SPACE(len);
         if (space > msgh->msg_controllen) {
             space -= CMSG_SPACE(len);
-            gemu_log("Host cmsg overflow");
+            gemu_log("Host cmsg overflow\n");
             break;
         }
 
@@ -468,7 +456,7 @@ static inline void target_to_host_cmsg(struct msghdr *msgh,
         cmsg->cmsg_type = tswap32(target_cmsg->cmsg_type);
         cmsg->cmsg_len = CMSG_LEN(len);
 
-        if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
+        if (cmsg->cmsg_level != TARGET_SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
             gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type);
             memcpy(data, target_data, len);
         } else {
@@ -487,6 +475,7 @@ static inline void target_to_host_cmsg(struct msghdr *msgh,
     msgh->msg_controllen = space;
 }
 
+/* ??? Should this also swap msgh->name?  */
 static inline void host_to_target_cmsg(struct target_msghdr *target_msgh,
                                        struct msghdr *msgh)
 {
@@ -503,7 +492,7 @@ static inline void host_to_target_cmsg(struct target_msghdr *target_msgh,
         space += TARGET_CMSG_SPACE(len);
         if (space > tswapl(target_msgh->msg_controllen)) {
             space -= TARGET_CMSG_SPACE(len);
-            gemu_log("Target cmsg overflow");
+            gemu_log("Target cmsg overflow\n");
             break;
         }
 
@@ -511,7 +500,7 @@ static inline void host_to_target_cmsg(struct target_msghdr *target_msgh,
         target_cmsg->cmsg_type = tswap32(cmsg->cmsg_type);
         target_cmsg->cmsg_len = tswapl(TARGET_CMSG_LEN(len));
 
-        if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
+        if (cmsg->cmsg_level != TARGET_SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
             gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type);
             memcpy(target_data, data, len);
         } else {
@@ -531,7 +520,7 @@ static inline void host_to_target_cmsg(struct target_msghdr *target_msgh,
 }
 
 static long do_setsockopt(int sockfd, int level, int optname, 
-                          void *optval, socklen_t optlen)
+                          target_ulong optval, socklen_t optlen)
 {
     int val, ret;
             
@@ -541,20 +530,31 @@ static long do_setsockopt(int sockfd, int level, int optname,
         if (optlen < sizeof(uint32_t))
             return -EINVAL;
         
-        if (get_user(val, (uint32_t *)optval))
-            return -EFAULT;
+        val = tget32(optval);
         ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
         break;
     case SOL_IP:
         switch(optname) {
+        case IP_TOS:
+        case IP_TTL:
         case IP_HDRINCL:
+        case IP_ROUTER_ALERT:
+        case IP_RECVOPTS:
+        case IP_RETOPTS:
+        case IP_PKTINFO:
+        case IP_MTU_DISCOVER:
+        case IP_RECVERR:
+        case IP_RECVTOS:
+#ifdef IP_FREEBIND
+        case IP_FREEBIND:
+#endif
+        case IP_MULTICAST_TTL:
+        case IP_MULTICAST_LOOP:
             val = 0;
             if (optlen >= sizeof(uint32_t)) {
-                if (get_user(val, (uint32_t *)optval))
-                    return -EFAULT;
+                val = tget32(optval);
             } else if (optlen >= 1) {
-                if (get_user(val, (uint8_t *)optval))
-                    return -EFAULT;
+                val = tget8(optval);
             }
             ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
             break;
@@ -562,36 +562,74 @@ static long do_setsockopt(int sockfd, int level, int optname,
             goto unimplemented;
         }
         break;
-    case SOL_SOCKET:
+    case TARGET_SOL_SOCKET:
         switch (optname) {
             /* Options with 'int' argument.  */
-        case SO_DEBUG:
-        case SO_REUSEADDR:
-        case SO_TYPE:
-        case SO_ERROR:
-        case SO_DONTROUTE:
-        case SO_BROADCAST:
-        case SO_SNDBUF:
-        case SO_RCVBUF:
-        case SO_KEEPALIVE:
-        case SO_OOBINLINE:
-        case SO_NO_CHECK:
-        case SO_PRIORITY:
-        case SO_BSDCOMPAT:
-        case SO_PASSCRED:
-        case SO_TIMESTAMP:
-        case SO_RCVLOWAT:
-        case SO_RCVTIMEO:
-        case SO_SNDTIMEO:
-            if (optlen < sizeof(uint32_t))
-                return -EINVAL;
-            if (get_user(val, (uint32_t *)optval))
-                return -EFAULT;
-            ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
+        case TARGET_SO_DEBUG:
+               optname = SO_DEBUG;
+               break;
+        case TARGET_SO_REUSEADDR:
+               optname = SO_REUSEADDR;
+               break;
+        case TARGET_SO_TYPE:
+               optname = SO_TYPE;
+               break;
+        case TARGET_SO_ERROR:
+               optname = SO_ERROR;
+               break;
+        case TARGET_SO_DONTROUTE:
+               optname = SO_DONTROUTE;
+               break;
+        case TARGET_SO_BROADCAST:
+               optname = SO_BROADCAST;
+               break;
+        case TARGET_SO_SNDBUF:
+               optname = SO_SNDBUF;
+               break;
+        case TARGET_SO_RCVBUF:
+               optname = SO_RCVBUF;
+               break;
+        case TARGET_SO_KEEPALIVE:
+               optname = SO_KEEPALIVE;
+               break;
+        case TARGET_SO_OOBINLINE:
+               optname = SO_OOBINLINE;
+               break;
+        case TARGET_SO_NO_CHECK:
+               optname = SO_NO_CHECK;
+               break;
+        case TARGET_SO_PRIORITY:
+               optname = SO_PRIORITY;
+               break;
+#ifdef SO_BSDCOMPAT
+        case TARGET_SO_BSDCOMPAT:
+               optname = SO_BSDCOMPAT;
+               break;
+#endif
+        case TARGET_SO_PASSCRED:
+               optname = SO_PASSCRED;
+               break;
+        case TARGET_SO_TIMESTAMP:
+               optname = SO_TIMESTAMP;
+               break;
+        case TARGET_SO_RCVLOWAT:
+               optname = SO_RCVLOWAT;
+               break;
+        case TARGET_SO_RCVTIMEO:
+               optname = SO_RCVTIMEO;
+               break;
+        case TARGET_SO_SNDTIMEO:
+               optname = SO_SNDTIMEO;
+               break;
             break;
         default:
             goto unimplemented;
         }
+       if (optlen < sizeof(uint32_t))
+       return -EINVAL;
+
+       val = tget32(optval);
+       ret = get_errno(setsockopt(sockfd, SOL_SOCKET, optname, &val, sizeof(val)));
         break;
     default:
     unimplemented:
@@ -602,37 +640,81 @@ static long do_setsockopt(int sockfd, int level, int optname,
 }
 
 static long do_getsockopt(int sockfd, int level, int optname, 
-                          void *optval, socklen_t *optlen)
+                          target_ulong optval, target_ulong optlen)
 {
     int len, lv, val, ret;
 
     switch(level) {
-    case SOL_SOCKET:
+    case TARGET_SOL_SOCKET:
+       level = SOL_SOCKET;
        switch (optname) {
-       case SO_LINGER:
-       case SO_RCVTIMEO:
-       case SO_SNDTIMEO:
-       case SO_PEERCRED:
-       case SO_PEERNAME:
+       case TARGET_SO_LINGER:
+       case TARGET_SO_RCVTIMEO:
+       case TARGET_SO_SNDTIMEO:
+       case TARGET_SO_PEERCRED:
+       case TARGET_SO_PEERNAME:
            /* These don't just return a single integer */
            goto unimplemented;
         default:
-            if (get_user(len, optlen))
-                return -EFAULT;
+            goto int_case;
+        }
+        break;
+    case SOL_TCP:
+        /* TCP options all take an 'int' value.  */
+    int_case:
+        len = tget32(optlen);
+        if (len < 0)
+            return -EINVAL;
+        lv = sizeof(int);
+        ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));
+        if (ret < 0)
+            return ret;
+        val = tswap32(val);
+        if (len > lv)
+            len = lv;
+        if (len == 4)
+            tput32(optval, val);
+        else
+            tput8(optval, val);
+        tput32(optlen, len);
+        break;
+    case SOL_IP:
+        switch(optname) {
+        case IP_TOS:
+        case IP_TTL:
+        case IP_HDRINCL:
+        case IP_ROUTER_ALERT:
+        case IP_RECVOPTS:
+        case IP_RETOPTS:
+        case IP_PKTINFO:
+        case IP_MTU_DISCOVER:
+        case IP_RECVERR:
+        case IP_RECVTOS:
+#ifdef IP_FREEBIND
+        case IP_FREEBIND:
+#endif
+        case IP_MULTICAST_TTL:
+        case IP_MULTICAST_LOOP:
+            len = tget32(optlen);
             if (len < 0)
                 return -EINVAL;
             lv = sizeof(int);
             ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));
             if (ret < 0)
                 return ret;
-            val = tswap32(val);
-            if (len > lv)
-                len = lv;
-            if (copy_to_user(optval, &val, len))
-                return -EFAULT;
-            if (put_user(len, optlen))
-                return -EFAULT;
+            if (len < sizeof(int) && len > 0 && val >= 0 && val < 255) {
+                len = 1;
+                tput32(optlen, len);
+                tput8(optval, val);
+            } else {
+                if (len > sizeof(int))
+                    len = sizeof(int);
+                tput32(optlen, len);
+                tput32(optval, val);
+            }
             break;
+        default:
+            goto unimplemented;
         }
         break;
     default:
@@ -645,166 +727,346 @@ static long do_getsockopt(int sockfd, int level, int optname,
     return ret;
 }
 
-static long do_socketcall(int num, int32_t *vptr)
+static void lock_iovec(struct iovec *vec, target_ulong target_addr,
+                       int count, int copy)
+{
+    struct target_iovec *target_vec;
+    target_ulong base;
+    int i;
+
+    target_vec = lock_user(target_addr, count * sizeof(struct target_iovec), 1);
+    for(i = 0;i < count; i++) {
+        base = tswapl(target_vec[i].iov_base);
+        vec[i].iov_len = tswapl(target_vec[i].iov_len);
+        vec[i].iov_base = lock_user(base, vec[i].iov_len, copy);
+    }
+    unlock_user (target_vec, target_addr, 0);
+}
+
+static void unlock_iovec(struct iovec *vec, target_ulong target_addr,
+                         int count, int copy)
+{
+    struct target_iovec *target_vec;
+    target_ulong base;
+    int i;
+
+    target_vec = lock_user(target_addr, count * sizeof(struct target_iovec), 1);
+    for(i = 0;i < count; i++) {
+        base = tswapl(target_vec[i].iov_base);
+        unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0);
+    }
+    unlock_user (target_vec, target_addr, 0);
+}
+
+static long do_socket(int domain, int type, int protocol)
+{
+#if defined(TARGET_MIPS)
+    switch(type) {
+    case TARGET_SOCK_DGRAM:
+        type = SOCK_DGRAM;
+        break;
+    case TARGET_SOCK_STREAM:
+        type = SOCK_STREAM;
+        break;
+    case TARGET_SOCK_RAW:
+        type = SOCK_RAW;
+        break;
+    case TARGET_SOCK_RDM:
+        type = SOCK_RDM;
+        break;
+    case TARGET_SOCK_SEQPACKET:
+        type = SOCK_SEQPACKET;
+        break;
+    case TARGET_SOCK_PACKET:
+        type = SOCK_PACKET;
+        break;
+    }
+#endif
+    return get_errno(socket(domain, type, protocol));
+}
+
+static long do_bind(int sockfd, target_ulong target_addr,
+                    socklen_t addrlen)
+{
+    void *addr = alloca(addrlen);
+    
+    target_to_host_sockaddr(addr, target_addr, addrlen);
+    return get_errno(bind(sockfd, addr, addrlen));
+}
+
+static long do_connect(int sockfd, target_ulong target_addr,
+                    socklen_t addrlen)
+{
+    void *addr = alloca(addrlen);
+    
+    target_to_host_sockaddr(addr, target_addr, addrlen);
+    return get_errno(connect(sockfd, addr, addrlen));
+}
+
+static long do_sendrecvmsg(int fd, target_ulong target_msg,
+                           int flags, int send)
+{
+    long ret;
+    struct target_msghdr *msgp;
+    struct msghdr msg;
+    int count;
+    struct iovec *vec;
+    target_ulong target_vec;
+
+    lock_user_struct(msgp, target_msg, 1);
+    if (msgp->msg_name) {
+        msg.msg_namelen = tswap32(msgp->msg_namelen);
+        msg.msg_name = alloca(msg.msg_namelen);
+        target_to_host_sockaddr(msg.msg_name, tswapl(msgp->msg_name),
+                                msg.msg_namelen);
+    } else {
+        msg.msg_name = NULL;
+        msg.msg_namelen = 0;
+    }
+    msg.msg_controllen = 2 * tswapl(msgp->msg_controllen);
+    msg.msg_control = alloca(msg.msg_controllen);
+    msg.msg_flags = tswap32(msgp->msg_flags);
+    
+    count = tswapl(msgp->msg_iovlen);
+    vec = alloca(count * sizeof(struct iovec));
+    target_vec = tswapl(msgp->msg_iov);
+    lock_iovec(vec, target_vec, count, send);
+    msg.msg_iovlen = count;
+    msg.msg_iov = vec;
+    
+    if (send) {
+        target_to_host_cmsg(&msg, msgp);
+        ret = get_errno(sendmsg(fd, &msg, flags));
+    } else {
+        ret = get_errno(recvmsg(fd, &msg, flags));
+        if (!is_error(ret))
+            host_to_target_cmsg(msgp, &msg);
+    }
+    unlock_iovec(vec, target_vec, count, !send);
+    return ret;
+}
+
+static long do_accept(int fd, target_ulong target_addr,
+                      target_ulong target_addrlen)
+{
+    socklen_t addrlen = tget32(target_addrlen);
+    void *addr = alloca(addrlen);
+    long ret;
+
+    ret = get_errno(accept(fd, addr, &addrlen));
+    if (!is_error(ret)) {
+        host_to_target_sockaddr(target_addr, addr, addrlen);
+        tput32(target_addrlen, addrlen);
+    }
+    return ret;
+}
+
+static long do_getpeername(int fd, target_ulong target_addr,
+                           target_ulong target_addrlen)
+{
+    socklen_t addrlen = tget32(target_addrlen);
+    void *addr = alloca(addrlen);
+    long ret;
+
+    ret = get_errno(getpeername(fd, addr, &addrlen));
+    if (!is_error(ret)) {
+        host_to_target_sockaddr(target_addr, addr, addrlen);
+        tput32(target_addrlen, addrlen);
+    }
+    return ret;
+}
+
+static long do_getsockname(int fd, target_ulong target_addr,
+                           target_ulong target_addrlen)
+{
+    socklen_t addrlen = tget32(target_addrlen);
+    void *addr = alloca(addrlen);
+    long ret;
+
+    ret = get_errno(getsockname(fd, addr, &addrlen));
+    if (!is_error(ret)) {
+        host_to_target_sockaddr(target_addr, addr, addrlen);
+        tput32(target_addrlen, addrlen);
+    }
+    return ret;
+}
+
+static long do_socketpair(int domain, int type, int protocol,
+                          target_ulong target_tab)
+{
+    int tab[2];
+    long ret;
+
+    ret = get_errno(socketpair(domain, type, protocol, tab));
+    if (!is_error(ret)) {
+        tput32(target_tab, tab[0]);
+        tput32(target_tab + 4, tab[1]);
+    }
+    return ret;
+}
+
+static long do_sendto(int fd, target_ulong msg, size_t len, int flags,
+                      target_ulong target_addr, socklen_t addrlen)
 {
+    void *addr;
+    void *host_msg;
     long ret;
 
+    host_msg = lock_user(msg, len, 1);
+    if (target_addr) {
+        addr = alloca(addrlen);
+        target_to_host_sockaddr(addr, target_addr, addrlen);
+        ret = get_errno(sendto(fd, host_msg, len, flags, addr, addrlen));
+    } else {
+        ret = get_errno(send(fd, host_msg, len, flags));
+    }
+    unlock_user(host_msg, msg, 0);
+    return ret;
+}
+
+static long do_recvfrom(int fd, target_ulong msg, size_t len, int flags,
+                        target_ulong target_addr, target_ulong target_addrlen)
+{
+    socklen_t addrlen;
+    void *addr;
+    void *host_msg;
+    long ret;
+
+    host_msg = lock_user(msg, len, 0);
+    if (target_addr) {
+        addrlen = tget32(target_addrlen);
+        addr = alloca(addrlen);
+        ret = get_errno(recvfrom(fd, host_msg, len, flags, addr, &addrlen));
+    } else {
+        addr = NULL; /* To keep compiler quiet.  */
+        ret = get_errno(recv(fd, host_msg, len, flags));
+    }
+    if (!is_error(ret)) {
+        if (target_addr) {
+            host_to_target_sockaddr(target_addr, addr, addrlen);
+            tput32(target_addrlen, addrlen);
+        }
+        unlock_user(host_msg, msg, len);
+    } else {
+        unlock_user(host_msg, msg, 0);
+    }
+    return ret;
+}
+
+static long do_socketcall(int num, target_ulong vptr)
+{
+    long ret;
+    const int n = sizeof(target_ulong);
+
     switch(num) {
     case SOCKOP_socket:
        {
-            int domain = tswap32(vptr[0]);
-            int type = tswap32(vptr[1]);
-            int protocol = tswap32(vptr[2]);
-
-            ret = get_errno(socket(domain, type, protocol));
+            int domain = tgetl(vptr);
+            int type = tgetl(vptr + n);
+            int protocol = tgetl(vptr + 2 * n);
+            ret = do_socket(domain, type, protocol);
        }
         break;
     case SOCKOP_bind:
        {
-            int sockfd = tswap32(vptr[0]);
-            void *target_addr = (void *)tswap32(vptr[1]);
-            socklen_t addrlen = tswap32(vptr[2]);
-            void *addr = alloca(addrlen);
-
-            target_to_host_sockaddr(addr, target_addr, addrlen);
-            ret = get_errno(bind(sockfd, addr, addrlen));
+            int sockfd = tgetl(vptr);
+            target_ulong target_addr = tgetl(vptr + n);
+            socklen_t addrlen = tgetl(vptr + 2 * n);
+            ret = do_bind(sockfd, target_addr, addrlen);
         }
         break;
     case SOCKOP_connect:
         {
-            int sockfd = tswap32(vptr[0]);
-            void *target_addr = (void *)tswap32(vptr[1]);
-            socklen_t addrlen = tswap32(vptr[2]);
-            void *addr = alloca(addrlen);
-
-            target_to_host_sockaddr(addr, target_addr, addrlen);
-            ret = get_errno(connect(sockfd, addr, addrlen));
+            int sockfd = tgetl(vptr);
+            target_ulong target_addr = tgetl(vptr + n);
+            socklen_t addrlen = tgetl(vptr + 2 * n);
+            ret = do_connect(sockfd, target_addr, addrlen);
         }
         break;
     case SOCKOP_listen:
         {
-            int sockfd = tswap32(vptr[0]);
-            int backlog = tswap32(vptr[1]);
-
+            int sockfd = tgetl(vptr);
+            int backlog = tgetl(vptr + n);
             ret = get_errno(listen(sockfd, backlog));
         }
         break;
     case SOCKOP_accept:
         {
-            int sockfd = tswap32(vptr[0]);
-            void *target_addr = (void *)tswap32(vptr[1]);
-            uint32_t *target_addrlen = (void *)tswap32(vptr[2]);
-            socklen_t addrlen = tswap32(*target_addrlen);
-            void *addr = alloca(addrlen);
-
-            ret = get_errno(accept(sockfd, addr, &addrlen));
-            if (!is_error(ret)) {
-                host_to_target_sockaddr(target_addr, addr, addrlen);
-                *target_addrlen = tswap32(addrlen);
-            }
+            int sockfd = tgetl(vptr);
+            target_ulong target_addr = tgetl(vptr + n);
+            target_ulong target_addrlen = tgetl(vptr + 2 * n);
+            ret = do_accept(sockfd, target_addr, target_addrlen);
         }
         break;
     case SOCKOP_getsockname:
         {
-            int sockfd = tswap32(vptr[0]);
-            void *target_addr = (void *)tswap32(vptr[1]);
-            uint32_t *target_addrlen = (void *)tswap32(vptr[2]);
-            socklen_t addrlen = tswap32(*target_addrlen);
-            void *addr = alloca(addrlen);
-
-            ret = get_errno(getsockname(sockfd, addr, &addrlen));
-            if (!is_error(ret)) {
-                host_to_target_sockaddr(target_addr, addr, addrlen);
-                *target_addrlen = tswap32(addrlen);
-            }
+            int sockfd = tgetl(vptr);
+            target_ulong target_addr = tgetl(vptr + n);
+            target_ulong target_addrlen = tgetl(vptr + 2 * n);
+            ret = do_getsockname(sockfd, target_addr, target_addrlen);
         }
         break;
     case SOCKOP_getpeername:
         {
-            int sockfd = tswap32(vptr[0]);
-            void *target_addr = (void *)tswap32(vptr[1]);
-            uint32_t *target_addrlen = (void *)tswap32(vptr[2]);
-            socklen_t addrlen = tswap32(*target_addrlen);
-            void *addr = alloca(addrlen);
-
-            ret = get_errno(getpeername(sockfd, addr, &addrlen));
-            if (!is_error(ret)) {
-                host_to_target_sockaddr(target_addr, addr, addrlen);
-                *target_addrlen = tswap32(addrlen);
-            }
+            int sockfd = tgetl(vptr);
+            target_ulong target_addr = tgetl(vptr + n);
+            target_ulong target_addrlen = tgetl(vptr + 2 * n);
+            ret = do_getpeername(sockfd, target_addr, target_addrlen);
         }
         break;
     case SOCKOP_socketpair:
         {
-            int domain = tswap32(vptr[0]);
-            int type = tswap32(vptr[1]);
-            int protocol = tswap32(vptr[2]);
-            int32_t *target_tab = (void *)tswap32(vptr[3]);
-            int tab[2];
-
-            ret = get_errno(socketpair(domain, type, protocol, tab));
-            if (!is_error(ret)) {
-                target_tab[0] = tswap32(tab[0]);
-                target_tab[1] = tswap32(tab[1]);
-            }
+            int domain = tgetl(vptr);
+            int type = tgetl(vptr + n);
+            int protocol = tgetl(vptr + 2 * n);
+            target_ulong tab = tgetl(vptr + 3 * n);
+            ret = do_socketpair(domain, type, protocol, tab);
         }
         break;
     case SOCKOP_send:
         {
-            int sockfd = tswap32(vptr[0]);
-            void *msg = (void *)tswap32(vptr[1]);
-            size_t len = tswap32(vptr[2]);
-            int flags = tswap32(vptr[3]);
-
-            ret = get_errno(send(sockfd, msg, len, flags));
+            int sockfd = tgetl(vptr);
+            target_ulong msg = tgetl(vptr + n);
+            size_t len = tgetl(vptr + 2 * n);
+            int flags = tgetl(vptr + 3 * n);
+            ret = do_sendto(sockfd, msg, len, flags, 0, 0);
         }
         break;
     case SOCKOP_recv:
         {
-            int sockfd = tswap32(vptr[0]);
-            void *msg = (void *)tswap32(vptr[1]);
-            size_t len = tswap32(vptr[2]);
-            int flags = tswap32(vptr[3]);
-
-            ret = get_errno(recv(sockfd, msg, len, flags));
+            int sockfd = tgetl(vptr);
+            target_ulong msg = tgetl(vptr + n);
+            size_t len = tgetl(vptr + 2 * n);
+            int flags = tgetl(vptr + 3 * n);
+            ret = do_recvfrom(sockfd, msg, len, flags, 0, 0);
         }
         break;
     case SOCKOP_sendto:
         {
-            int sockfd = tswap32(vptr[0]);
-            void *msg = (void *)tswap32(vptr[1]);
-            size_t len = tswap32(vptr[2]);
-            int flags = tswap32(vptr[3]);
-            void *target_addr = (void *)tswap32(vptr[4]);
-            socklen_t addrlen = tswap32(vptr[5]);
-            void *addr = alloca(addrlen);
-
-            target_to_host_sockaddr(addr, target_addr, addrlen);
-            ret = get_errno(sendto(sockfd, msg, len, flags, addr, addrlen));
+            int sockfd = tgetl(vptr);
+            target_ulong msg = tgetl(vptr + n);
+            size_t len = tgetl(vptr + 2 * n);
+            int flags = tgetl(vptr + 3 * n);
+            target_ulong addr = tgetl(vptr + 4 * n);
+            socklen_t addrlen = tgetl(vptr + 5 * n);
+            ret = do_sendto(sockfd, msg, len, flags, addr, addrlen);
         }
         break;
     case SOCKOP_recvfrom:
         {
-            int sockfd = tswap32(vptr[0]);
-            void *msg = (void *)tswap32(vptr[1]);
-            size_t len = tswap32(vptr[2]);
-            int flags = tswap32(vptr[3]);
-            void *target_addr = (void *)tswap32(vptr[4]);
-            uint32_t *target_addrlen = (void *)tswap32(vptr[5]);
-            socklen_t addrlen = tswap32(*target_addrlen);
-            void *addr = alloca(addrlen);
-
-            ret = get_errno(recvfrom(sockfd, msg, len, flags, addr, &addrlen));
-            if (!is_error(ret)) {
-                host_to_target_sockaddr(target_addr, addr, addrlen);
-                *target_addrlen = tswap32(addrlen);
-            }
+            int sockfd = tgetl(vptr);
+            target_ulong msg = tgetl(vptr + n);
+            size_t len = tgetl(vptr + 2 * n);
+            int flags = tgetl(vptr + 3 * n);
+            target_ulong addr = tgetl(vptr + 4 * n);
+            target_ulong addrlen = tgetl(vptr + 5 * n);
+            ret = do_recvfrom(sockfd, msg, len, flags, addr, addrlen);
         }
         break;
     case SOCKOP_shutdown:
         {
-            int sockfd = tswap32(vptr[0]);
-            int how = tswap32(vptr[1]);
+            int sockfd = tgetl(vptr);
+            int how = tgetl(vptr + n);
 
             ret = get_errno(shutdown(sockfd, how));
         }
@@ -813,59 +1075,35 @@ static long do_socketcall(int num, int32_t *vptr)
     case SOCKOP_recvmsg:
         {
             int fd;
-            struct target_msghdr *msgp;
-            struct msghdr msg;
-            int flags, count, i;
-            struct iovec *vec;
-            struct target_iovec *target_vec;
+            target_ulong target_msg;
+            int flags;
 
-            msgp = (void *)tswap32(vptr[1]);
-            msg.msg_name = (void *)tswapl(msgp->msg_name);
-            msg.msg_namelen = tswapl(msgp->msg_namelen);
-            msg.msg_controllen = 2 * tswapl(msgp->msg_controllen);
-            msg.msg_control = alloca(msg.msg_controllen);
-            msg.msg_flags = tswap32(msgp->msg_flags);
+            fd = tgetl(vptr);
+            target_msg = tgetl(vptr + n);
+            flags = tgetl(vptr + 2 * n);
 
-            count = tswapl(msgp->msg_iovlen);
-            vec = alloca(count * sizeof(struct iovec));
-            target_vec = (void *)tswapl(msgp->msg_iov);
-            for(i = 0;i < count; i++) {
-                vec[i].iov_base = (void *)tswapl(target_vec[i].iov_base);
-                vec[i].iov_len = tswapl(target_vec[i].iov_len);
-            }
-            msg.msg_iovlen = count;
-            msg.msg_iov = vec;
-
-            fd = tswap32(vptr[0]);
-            flags = tswap32(vptr[2]);
-            if (num == SOCKOP_sendmsg) {
-                target_to_host_cmsg(&msg, msgp);
-                ret = get_errno(sendmsg(fd, &msg, flags));
-            } else {
-                ret = get_errno(recvmsg(fd, &msg, flags));
-                if (!is_error(ret))
-                  host_to_target_cmsg(msgp, &msg);
-            }
+            ret = do_sendrecvmsg(fd, target_msg, flags, 
+                                 (num == SOCKOP_sendmsg));
         }
         break;
     case SOCKOP_setsockopt:
         {
-            int sockfd = tswap32(vptr[0]);
-            int level = tswap32(vptr[1]);
-            int optname = tswap32(vptr[2]);
-            void *optval = (void *)tswap32(vptr[3]);
-            socklen_t optlen = tswap32(vptr[4]);
+            int sockfd = tgetl(vptr);
+            int level = tgetl(vptr + n);
+            int optname = tgetl(vptr + 2 * n);
+            target_ulong optval = tgetl(vptr + 3 * n);
+            socklen_t optlen = tgetl(vptr + 4 * n);
 
             ret = do_setsockopt(sockfd, level, optname, optval, optlen);
         }
         break;
     case SOCKOP_getsockopt:
         {
-            int sockfd = tswap32(vptr[0]);
-            int level = tswap32(vptr[1]);
-            int optname = tswap32(vptr[2]);
-            void *optval = (void *)tswap32(vptr[3]);
-            uint32_t *poptlen = (void *)tswap32(vptr[4]);
+            int sockfd = tgetl(vptr);
+            int level = tgetl(vptr + n);
+            int optname = tgetl(vptr + 2 * n);
+            target_ulong optval = tgetl(vptr + 3 * n);
+            target_ulong poptlen = tgetl(vptr + 4 * n);
 
             ret = do_getsockopt(sockfd, level, optname, optval, poptlen);
         }
@@ -878,7 +1116,6 @@ static long do_socketcall(int num, int32_t *vptr)
     return ret;
 }
 
-
 #define N_SHM_REGIONS  32
 
 static struct shm_region {
@@ -886,6 +1123,13 @@ static struct shm_region {
     uint32_t   size;
 } shm_regions[N_SHM_REGIONS];
 
+union semun {
+       int val;
+       struct senid_ds *buf;
+       unsigned short *array;
+};
+
+/* ??? This only works with linear mappings.  */
 static long do_ipc(long call, long first, long second, long third,
                   long ptr, long fifth)
 {
@@ -899,6 +1143,52 @@ static long do_ipc(long call, long first, long second, long third,
     call &= 0xffff;
 
     switch (call) {
+    case IPCOP_semop:
+        ret = get_errno(semop(first,(struct sembuf *) ptr, second));
+        break;
+
+    case IPCOP_semget:
+        ret = get_errno(semget(first, second, third));
+        break;
+
+    case IPCOP_semctl:
+        ret = get_errno(semctl(first, second, third, ((union semun*)ptr)->val));
+
+        break;
+
+    case IPCOP_semtimedop:
+        gemu_log("Unsupported ipc call: %ld (version %d)\n", call, version);
+        ret = -ENOSYS;
+        break;
+
+       case IPCOP_msgget:
+               ret = get_errno(msgget(first, second));
+               break;
+
+       case IPCOP_msgsnd:
+               ret = get_errno(msgsnd(first, (struct msgbuf *) ptr, second, third));
+               break;
+
+       case IPCOP_msgctl:
+               ret = get_errno(msgctl(first, second, (struct msqid_ds *) ptr));
+               break;
+
+       case IPCOP_msgrcv:
+               {
+                       struct ipc_kludge
+                       {
+                               void *__unbounded msgp;
+                               long int msgtyp;
+                       };
+
+                       struct ipc_kludge *foo = (struct ipc_kludge *) ptr;
+                       struct msgbuf *msgp = (struct msgbuf *) foo->msgp;
+
+                       ret = get_errno(msgrcv(first, msgp, second, 0, third));
+
+               }
+               break;
+
     case IPCOP_shmat:
        /* SHM_* flags are the same on all linux platforms */
        ret = get_errno((long) shmat(first, (void *) ptr, second));
@@ -1002,12 +1292,15 @@ IOCTLEntry ioctl_entries[] = {
     { 0, 0, },
 };
 
+/* ??? Implement proper locking for ioctls.  */
 static long do_ioctl(long fd, long cmd, long arg)
 {
     const IOCTLEntry *ie;
     const argtype *arg_type;
     long ret;
     uint8_t buf_temp[MAX_STRUCT_SIZE];
+    int target_size;
+    void *argptr;
 
     ie = ioctl_entries;
     for(;;) {
@@ -1035,23 +1328,32 @@ static long do_ioctl(long fd, long cmd, long arg)
         break;
     case TYPE_PTR:
         arg_type++;
+        target_size = thunk_type_size(arg_type, 0);
         switch(ie->access) {
         case IOC_R:
             ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
             if (!is_error(ret)) {
-                thunk_convert((void *)arg, buf_temp, arg_type, THUNK_TARGET);
+                argptr = lock_user(arg, target_size, 0);
+                thunk_convert(argptr, buf_temp, arg_type, THUNK_TARGET);
+                unlock_user(argptr, arg, target_size);
             }
             break;
         case IOC_W:
-            thunk_convert(buf_temp, (void *)arg, arg_type, THUNK_HOST);
+            argptr = lock_user(arg, target_size, 1);
+            thunk_convert(buf_temp, argptr, arg_type, THUNK_HOST);
+            unlock_user(argptr, arg, 0);
             ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
             break;
         default:
         case IOC_RW:
-            thunk_convert(buf_temp, (void *)arg, arg_type, THUNK_HOST);
+            argptr = lock_user(arg, target_size, 1);
+            thunk_convert(buf_temp, argptr, arg_type, THUNK_HOST);
+            unlock_user(argptr, arg, 0);
             ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
             if (!is_error(ret)) {
-                thunk_convert((void *)arg, buf_temp, arg_type, THUNK_TARGET);
+                argptr = lock_user(arg, target_size, 0);
+                thunk_convert(argptr, buf_temp, arg_type, THUNK_TARGET);
+                unlock_user(argptr, arg, target_size);
             }
             break;
         }
@@ -1275,35 +1577,41 @@ static bitmask_transtbl fcntl_flags_tbl[] = {
 /* NOTE: there is really one LDT for all the threads */
 uint8_t *ldt_table;
 
-static int read_ldt(void *ptr, unsigned long bytecount)
+static int read_ldt(target_ulong ptr, unsigned long bytecount)
 {
     int size;
+    void *p;
 
     if (!ldt_table)
         return 0;
     size = TARGET_LDT_ENTRIES * TARGET_LDT_ENTRY_SIZE;
     if (size > bytecount)
         size = bytecount;
-    memcpy(ptr, ldt_table, size);
+    p = lock_user(ptr, size, 0);
+    /* ??? Shoudl this by byteswapped?  */
+    memcpy(p, ldt_table, size);
+    unlock_user(p, ptr, size);
     return size;
 }
 
 /* XXX: add locking support */
 static int write_ldt(CPUX86State *env, 
-                     void *ptr, unsigned long bytecount, int oldmode)
+                     target_ulong ptr, unsigned long bytecount, int oldmode)
 {
     struct target_modify_ldt_ldt_s ldt_info;
+    struct target_modify_ldt_ldt_s *target_ldt_info;
     int seg_32bit, contents, read_exec_only, limit_in_pages;
     int seg_not_present, useable;
     uint32_t *lp, entry_1, entry_2;
 
     if (bytecount != sizeof(ldt_info))
         return -EINVAL;
-    memcpy(&ldt_info, ptr, sizeof(ldt_info));
-    tswap32s(&ldt_info.entry_number);
-    tswapls((long *)&ldt_info.base_addr);
-    tswap32s(&ldt_info.limit);
-    tswap32s(&ldt_info.flags);
+    lock_user_struct(target_ldt_info, ptr, 1);
+    ldt_info.entry_number = tswap32(target_ldt_info->entry_number);
+    ldt_info.base_addr = tswapl(target_ldt_info->base_addr);
+    ldt_info.limit = tswap32(target_ldt_info->limit);
+    ldt_info.flags = tswap32(target_ldt_info->flags);
+    unlock_user_struct(target_ldt_info, ptr, 0);
     
     if (ldt_info.entry_number >= TARGET_LDT_ENTRIES)
         return -EINVAL;
@@ -1326,7 +1634,7 @@ static int write_ldt(CPUX86State *env,
         if (!ldt_table)
             return -ENOMEM;
         memset(ldt_table, 0, TARGET_LDT_ENTRIES * TARGET_LDT_ENTRY_SIZE);
-        env->ldt.base = ldt_table;
+        env->ldt.base = h2g(ldt_table);
         env->ldt.limit = 0xffff;
     }
 
@@ -1369,7 +1677,7 @@ install:
 }
 
 /* specific and weird i386 syscalls */
-int do_modify_ldt(CPUX86State *env, int func, void *ptr, unsigned long bytecount)
+int do_modify_ldt(CPUX86State *env, int func, target_ulong ptr, unsigned long bytecount)
 {
     int ret = -ENOSYS;
     
@@ -1417,8 +1725,7 @@ int do_fork(CPUState *env, unsigned int flags, unsigned long newsp)
         ts->next = first_task_state;
         first_task_state = ts;
         /* we create a new CPU instance. */
-        new_env = cpu_init();
-        memcpy(new_env, env, sizeof(CPUState));
+        new_env = cpu_copy(env);
 #if defined(TARGET_I386)
         if (!newsp)
             newsp = env->regs[R_ESP];
@@ -1430,6 +1737,19 @@ int do_fork(CPUState *env, unsigned int flags, unsigned long newsp)
         new_env->regs[13] = newsp;
         new_env->regs[0] = 0;
 #elif defined(TARGET_SPARC)
+        if (!newsp)
+            newsp = env->regwptr[22];
+        new_env->regwptr[22] = newsp;
+        new_env->regwptr[0] = 0;
+       /* XXXXX */
+        printf ("HELPME: %s:%d\n", __FILE__, __LINE__);
+#elif defined(TARGET_M68K)
+        if (!newsp)
+            newsp = env->aregs[7];
+        new_env->aregs[7] = newsp;
+        new_env->dregs[0] = 0;
+        /* ??? is this sufficient?  */
+#elif defined(TARGET_MIPS)
         printf ("HELPME: %s:%d\n", __FILE__, __LINE__);
 #elif defined(TARGET_PPC)
         if (!newsp)
@@ -1440,12 +1760,17 @@ int do_fork(CPUState *env, unsigned int flags, unsigned long newsp)
             for (i = 7; i < 32; i++)
                 new_env->gpr[i] = 0;
         }
+#elif defined(TARGET_SH4)
+       if (!newsp)
+         newsp = env->gregs[15];
+       new_env->gregs[15] = newsp;
+       /* XXXXX */
 #else
 #error unsupported target CPU
 #endif
         new_env->opaque = ts;
 #ifdef __ia64__
-        ret = clone2(clone_func, new_stack + NEW_STACK_SIZE, flags, new_env);
+        ret = __clone2(clone_func, new_stack + NEW_STACK_SIZE, flags, new_env);
 #else
        ret = clone(clone_func, new_stack + NEW_STACK_SIZE, flags, new_env);
 #endif
@@ -1458,39 +1783,62 @@ int do_fork(CPUState *env, unsigned int flags, unsigned long newsp)
     return ret;
 }
 
-static long do_fcntl(int fd, int cmd, unsigned long arg)
+static long do_fcntl(int fd, int cmd, target_ulong arg)
 {
     struct flock fl;
-    struct target_flock *target_fl = (void *)arg;
+    struct target_flock *target_fl;
+    struct flock64 fl64;
+    struct target_flock64 *target_fl64;
     long ret;
-    
+
     switch(cmd) {
     case TARGET_F_GETLK:
         ret = fcntl(fd, cmd, &fl);
         if (ret == 0) {
+            lock_user_struct(target_fl, arg, 0);
             target_fl->l_type = tswap16(fl.l_type);
             target_fl->l_whence = tswap16(fl.l_whence);
             target_fl->l_start = tswapl(fl.l_start);
             target_fl->l_len = tswapl(fl.l_len);
             target_fl->l_pid = tswapl(fl.l_pid);
+            unlock_user_struct(target_fl, arg, 1);
         }
         break;
         
     case TARGET_F_SETLK:
     case TARGET_F_SETLKW:
+        lock_user_struct(target_fl, arg, 1);
         fl.l_type = tswap16(target_fl->l_type);
         fl.l_whence = tswap16(target_fl->l_whence);
         fl.l_start = tswapl(target_fl->l_start);
         fl.l_len = tswapl(target_fl->l_len);
         fl.l_pid = tswapl(target_fl->l_pid);
+        unlock_user_struct(target_fl, arg, 0);
         ret = fcntl(fd, cmd, &fl);
         break;
         
     case TARGET_F_GETLK64:
+        ret = fcntl(fd, cmd >> 1, &fl64);
+        if (ret == 0) {
+            lock_user_struct(target_fl64, arg, 0);
+            target_fl64->l_type = tswap16(fl64.l_type) >> 1;
+            target_fl64->l_whence = tswap16(fl64.l_whence);
+            target_fl64->l_start = tswapl(fl64.l_start);
+            target_fl64->l_len = tswapl(fl64.l_len);
+            target_fl64->l_pid = tswapl(fl64.l_pid);
+            unlock_user_struct(target_fl64, arg, 1);
+        }
+               break;
     case TARGET_F_SETLK64:
     case TARGET_F_SETLKW64:
-        ret = -1;
-        errno = EINVAL;
+        lock_user_struct(target_fl64, arg, 1);
+        fl64.l_type = tswap16(target_fl64->l_type) >> 1;
+        fl64.l_whence = tswap16(target_fl64->l_whence);
+        fl64.l_start = tswapl(target_fl64->l_start);
+        fl64.l_len = tswapl(target_fl64->l_len);
+        fl64.l_pid = tswap16(target_fl64->l_pid);
+        unlock_user_struct(target_fl64, arg, 0);
+               ret = fcntl(fd, cmd >> 1, &fl64);
         break;
 
     case F_GETFL:
@@ -1586,12 +1934,74 @@ void syscall_init(void)
     }
 }
 
+static inline uint64_t target_offset64(uint32_t word0, uint32_t word1)
+{
+#ifdef TARGET_WORDS_BIG_ENDIAN
+    return ((uint64_t)word0 << 32) | word1;
+#else
+    return ((uint64_t)word1 << 32) | word0;
+#endif
+}
+
+#ifdef TARGET_NR_truncate64
+static inline long target_truncate64(void *cpu_env, const char *arg1,
+                                     long arg2, long arg3, long arg4)
+{
+#ifdef TARGET_ARM
+    if (((CPUARMState *)cpu_env)->eabi)
+      {
+        arg2 = arg3;
+        arg3 = arg4;
+      }
+#endif
+    return get_errno(truncate64(arg1, target_offset64(arg2, arg3)));
+}
+#endif
+
+#ifdef TARGET_NR_ftruncate64
+static inline long target_ftruncate64(void *cpu_env, long arg1, long arg2,
+                                      long arg3, long arg4)
+{
+#ifdef TARGET_ARM
+    if (((CPUARMState *)cpu_env)->eabi)
+      {
+        arg2 = arg3;
+        arg3 = arg4;
+      }
+#endif
+    return get_errno(ftruncate64(arg1, target_offset64(arg2, arg3)));
+}
+#endif
+
+static inline void target_to_host_timespec(struct timespec *host_ts,
+                                           target_ulong target_addr)
+{
+    struct target_timespec *target_ts;
+
+    lock_user_struct(target_ts, target_addr, 1);
+    host_ts->tv_sec = tswapl(target_ts->tv_sec);
+    host_ts->tv_nsec = tswapl(target_ts->tv_nsec);
+    unlock_user_struct(target_ts, target_addr, 0);
+}
+
+static inline void host_to_target_timespec(target_ulong target_addr,
+                                           struct timespec *host_ts)
+{
+    struct target_timespec *target_ts;
+
+    lock_user_struct(target_ts, target_addr, 0);
+    target_ts->tv_sec = tswapl(host_ts->tv_sec);
+    target_ts->tv_nsec = tswapl(host_ts->tv_nsec);
+    unlock_user_struct(target_ts, target_addr, 1);
+}
+
 long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3, 
                 long arg4, long arg5, long arg6)
 {
     long ret;
     struct stat st;
-    struct kernel_statfs *stfs;
+    struct statfs stfs;
+    void *p;
     
 #ifdef DEBUG
     gemu_log("syscall %d", num);
@@ -1601,92 +2011,146 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
 #ifdef HAVE_GPROF
         _mcleanup();
 #endif
+        gdb_exit(cpu_env, arg1);
         /* XXX: should free thread stack and CPU env */
         _exit(arg1);
         ret = 0; /* avoid warning */
         break;
     case TARGET_NR_read:
-        page_unprotect_range((void *)arg2, arg3);
-        ret = get_errno(read(arg1, (void *)arg2, arg3));
+        page_unprotect_range(arg2, arg3);
+        p = lock_user(arg2, arg3, 0);
+        ret = get_errno(read(arg1, p, arg3));
+        unlock_user(p, arg2, ret);
         break;
     case TARGET_NR_write:
-        ret = get_errno(write(arg1, (void *)arg2, arg3));
+        p = lock_user(arg2, arg3, 1);
+        ret = get_errno(write(arg1, p, arg3));
+        unlock_user(p, arg2, 0);
         break;
     case TARGET_NR_open:
-        ret = get_errno(open(path((const char *)arg1),
+        p = lock_user_string(arg1);
+        ret = get_errno(open(path(p),
                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
                              arg3));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_close:
         ret = get_errno(close(arg1));
         break;
     case TARGET_NR_brk:
-        ret = do_brk((char *)arg1);
+        ret = do_brk(arg1);
         break;
     case TARGET_NR_fork:
         ret = get_errno(do_fork(cpu_env, SIGCHLD, 0));
         break;
     case TARGET_NR_waitpid:
         {
-            int *status = (int *)arg2;
-            ret = get_errno(waitpid(arg1, status, arg3));
-            if (!is_error(ret) && status)
-                tswapls((long *)&status);
+            int status;
+            ret = get_errno(waitpid(arg1, &status, arg3));
+            if (!is_error(ret) && arg2)
+                tput32(arg2, status);
         }
         break;
     case TARGET_NR_creat:
-        ret = get_errno(creat((const char *)arg1, arg2));
+        p = lock_user_string(arg1);
+        ret = get_errno(creat(p, arg2));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_link:
-        ret = get_errno(link((const char *)arg1, (const char *)arg2));
+        {
+            void * p2;
+            p = lock_user_string(arg1);
+            p2 = lock_user_string(arg2);
+            ret = get_errno(link(p, p2));
+            unlock_user(p2, arg2, 0);
+            unlock_user(p, arg1, 0);
+        }
         break;
     case TARGET_NR_unlink:
-        ret = get_errno(unlink((const char *)arg1));
+        p = lock_user_string(arg1);
+        ret = get_errno(unlink(p));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_execve:
         {
             char **argp, **envp;
             int argc, envc;
-            uint32_t *p;
+            target_ulong gp;
+            target_ulong guest_argp;
+            target_ulong guest_envp;
+            target_ulong addr;
             char **q;
 
             argc = 0;
-            for (p = (void *)arg2; *p; p++)
+            guest_argp = arg2;
+            for (gp = guest_argp; tgetl(gp); gp++)
                 argc++;
             envc = 0;
-            for (p = (void *)arg3; *p; p++)
+            guest_envp = arg3;
+            for (gp = guest_envp; tgetl(gp); gp++)
                 envc++;
 
             argp = alloca((argc + 1) * sizeof(void *));
             envp = alloca((envc + 1) * sizeof(void *));
 
-            for (p = (void *)arg2, q = argp; *p; p++, q++)
-                *q = (void *)tswap32(*p);
+            for (gp = guest_argp, q = argp; ;
+                  gp += sizeof(target_ulong), q++) {
+                addr = tgetl(gp);
+                if (!addr)
+                    break;
+                *q = lock_user_string(addr);
+            }
             *q = NULL;
 
-            for (p = (void *)arg3, q = envp; *p; p++, q++)
-                *q = (void *)tswap32(*p);
+            for (gp = guest_envp, q = envp; ;
+                  gp += sizeof(target_ulong), q++) {
+                addr = tgetl(gp);
+                if (!addr)
+                    break;
+                *q = lock_user_string(addr);
+            }
             *q = NULL;
 
-            ret = get_errno(execve((const char *)arg1, argp, envp));
+            p = lock_user_string(arg1);
+            ret = get_errno(execve(p, argp, envp));
+            unlock_user(p, arg1, 0);
+
+            for (gp = guest_argp, q = argp; *q;
+                  gp += sizeof(target_ulong), q++) {
+                addr = tgetl(gp);
+                unlock_user(*q, addr, 0);
+            }
+            for (gp = guest_envp, q = envp; *q;
+                  gp += sizeof(target_ulong), q++) {
+                addr = tgetl(gp);
+                unlock_user(*q, addr, 0);
+            }
         }
         break;
     case TARGET_NR_chdir:
-        ret = get_errno(chdir((const char *)arg1));
+        p = lock_user_string(arg1);
+        ret = get_errno(chdir(p));
+        unlock_user(p, arg1, 0);
         break;
+#ifdef TARGET_NR_time
     case TARGET_NR_time:
         {
-            int *time_ptr = (int *)arg1;
-            ret = get_errno(time((time_t *)time_ptr));
-            if (!is_error(ret) && time_ptr)
-                tswap32s(time_ptr);
+            time_t host_time;
+            ret = get_errno(time(&host_time));
+            if (!is_error(ret) && arg1)
+                tputl(arg1, host_time);
         }
         break;
+#endif
     case TARGET_NR_mknod:
-        ret = get_errno(mknod((const char *)arg1, arg2, arg3));
+        p = lock_user_string(arg1);
+        ret = get_errno(mknod(p, arg2, arg3));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_chmod:
-        ret = get_errno(chmod((const char *)arg1, arg2));
+        p = lock_user_string(arg1);
+        ret = get_errno(chmod(p, arg2));
+        unlock_user(p, arg1, 0);
         break;
 #ifdef TARGET_NR_break
     case TARGET_NR_break:
@@ -1703,17 +2167,28 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         ret = get_errno(getpid());
         break;
     case TARGET_NR_mount:
-        /* need to look at the data field */
-        goto unimplemented;
+               {
+                       /* need to look at the data field */
+                       void *p2, *p3;
+                       p = lock_user_string(arg1);
+                       p2 = lock_user_string(arg2);
+                       p3 = lock_user_string(arg3);
+                       ret = get_errno(mount(p, p2, p3, (unsigned long)arg4, (const void *)arg5));
+                       unlock_user(p, arg1, 0);
+                       unlock_user(p2, arg2, 0);
+                       unlock_user(p3, arg3, 0);
+                       break;
+               }
     case TARGET_NR_umount:
-        ret = get_errno(umount((const char *)arg1));
+        p = lock_user_string(arg1);
+        ret = get_errno(umount(p));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_stime:
         {
-            int *time_ptr = (int *)arg1;
-            if (time_ptr)
-                tswap32s(time_ptr);
-            ret = get_errno(stime((time_t *)time_ptr));
+            time_t host_time;
+            host_time = tgetl(arg1);
+            ret = get_errno(stime(&host_time));
         }
         break;
     case TARGET_NR_ptrace:
@@ -1730,16 +2205,36 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         break;
     case TARGET_NR_utime:
         {
-            struct utimbuf tbuf, *tbuf1;
-            struct target_utimbuf *target_tbuf = (void *)arg2;
-            if (target_tbuf) {
-                get_user(tbuf.actime, &target_tbuf->actime);
-                get_user(tbuf.modtime, &target_tbuf->modtime);
-                tbuf1 = &tbuf;
+            struct utimbuf tbuf, *host_tbuf;
+            struct target_utimbuf *target_tbuf;
+            if (arg2) {
+                lock_user_struct(target_tbuf, arg2, 1);
+                tbuf.actime = tswapl(target_tbuf->actime);
+                tbuf.modtime = tswapl(target_tbuf->modtime);
+                unlock_user_struct(target_tbuf, arg2, 0);
+                host_tbuf = &tbuf;
+            } else {
+                host_tbuf = NULL;
+            }
+            p = lock_user_string(arg1);
+            ret = get_errno(utime(p, host_tbuf));
+            unlock_user(p, arg1, 0);
+        }
+        break;
+    case TARGET_NR_utimes:
+        {
+            struct timeval *tvp, tv[2];
+            if (arg2) {
+                target_to_host_timeval(&tv[0], arg2);
+                target_to_host_timeval(&tv[1],
+                    arg2 + sizeof (struct target_timeval));
+                tvp = tv;
             } else {
-                tbuf1 = NULL;
+                tvp = NULL;
             }
-            ret = get_errno(utime((const char *)arg1, tbuf1));
+            p = lock_user_string(arg1);
+            ret = get_errno(utimes(p, tvp));
+            unlock_user(p, arg1, 0);
         }
         break;
 #ifdef TARGET_NR_stty
@@ -1751,7 +2246,9 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         goto unimplemented;
 #endif
     case TARGET_NR_access:
-        ret = get_errno(access((const char *)arg1, arg2));
+        p = lock_user_string(arg1);
+        ret = get_errno(access(p, arg2));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_nice:
         ret = get_errno(nice(arg1));
@@ -1768,33 +2265,45 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         ret = get_errno(kill(arg1, arg2));
         break;
     case TARGET_NR_rename:
-        ret = get_errno(rename((const char *)arg1, (const char *)arg2));
+        {
+            void *p2;
+            p = lock_user_string(arg1);
+            p2 = lock_user_string(arg2);
+            ret = get_errno(rename(p, p2));
+            unlock_user(p2, arg2, 0);
+            unlock_user(p, arg1, 0);
+        }
         break;
     case TARGET_NR_mkdir:
-        ret = get_errno(mkdir((const char *)arg1, arg2));
+        p = lock_user_string(arg1);
+        ret = get_errno(mkdir(p, arg2));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_rmdir:
-        ret = get_errno(rmdir((const char *)arg1));
+        p = lock_user_string(arg1);
+        ret = get_errno(rmdir(p));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_dup:
         ret = get_errno(dup(arg1));
         break;
     case TARGET_NR_pipe:
         {
-            int *pipe_ptr = (int *)arg1;
-            ret = get_errno(pipe(pipe_ptr));
+            int host_pipe[2];
+            ret = get_errno(pipe(host_pipe));
             if (!is_error(ret)) {
-                tswap32s(&pipe_ptr[0]);
-                tswap32s(&pipe_ptr[1]);
+                tput32(arg1, host_pipe[0]);
+                tput32(arg1 + 4, host_pipe[1]);
             }
         }
         break;
     case TARGET_NR_times:
         {
-            struct target_tms *tmsp = (void *)arg1;
+            struct target_tms *tmsp;
             struct tms tms;
             ret = get_errno(times(&tms));
-            if (tmsp) {
+            if (arg1) {
+                tmsp = lock_user(arg1, sizeof(struct target_tms), 0);
                 tmsp->tms_utime = tswapl(host_to_target_clock_t(tms.tms_utime));
                 tmsp->tms_stime = tswapl(host_to_target_clock_t(tms.tms_stime));
                 tmsp->tms_cutime = tswapl(host_to_target_clock_t(tms.tms_cutime));
@@ -1812,9 +2321,14 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         goto unimplemented;
 
     case TARGET_NR_acct:
-        goto unimplemented;
+        p = lock_user_string(arg1);
+        ret = get_errno(acct(path(p)));
+        unlock_user(p, arg1, 0);
+        break;
     case TARGET_NR_umount2:
-        ret = get_errno(umount2((const char *)arg1, arg2));
+        p = lock_user_string(arg1);
+        ret = get_errno(umount2(p, arg2));
+        unlock_user(p, arg1, 0);
         break;
 #ifdef TARGET_NR_lock
     case TARGET_NR_lock:
@@ -1845,7 +2359,9 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         ret = get_errno(umask(arg1));
         break;
     case TARGET_NR_chroot:
-        ret = get_errno(chroot((const char *)arg1));
+        p = lock_user_string(arg1);
+        ret = get_errno(chroot(p));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_ustat:
         goto unimplemented;
@@ -1863,29 +2379,77 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         break;
     case TARGET_NR_sigaction:
         {
-            struct target_old_sigaction *old_act = (void *)arg2;
-            struct target_old_sigaction *old_oact = (void *)arg3;
+       #if !defined(TARGET_MIPS)
+            struct target_old_sigaction *old_act;
             struct target_sigaction act, oact, *pact;
-            if (old_act) {
+            if (arg2) {
+                lock_user_struct(old_act, arg2, 1);
                 act._sa_handler = old_act->_sa_handler;
                 target_siginitset(&act.sa_mask, old_act->sa_mask);
                 act.sa_flags = old_act->sa_flags;
                 act.sa_restorer = old_act->sa_restorer;
+                unlock_user_struct(old_act, arg2, 0);
                 pact = &act;
             } else {
                 pact = NULL;
             }
             ret = get_errno(do_sigaction(arg1, pact, &oact));
-            if (!is_error(ret) && old_oact) {
-                old_oact->_sa_handler = oact._sa_handler;
-                old_oact->sa_mask = oact.sa_mask.sig[0];
-                old_oact->sa_flags = oact.sa_flags;
-                old_oact->sa_restorer = oact.sa_restorer;
+            if (!is_error(ret) && arg3) {
+                lock_user_struct(old_act, arg3, 0);
+                old_act->_sa_handler = oact._sa_handler;
+                old_act->sa_mask = oact.sa_mask.sig[0];
+                old_act->sa_flags = oact.sa_flags;
+                old_act->sa_restorer = oact.sa_restorer;
+                unlock_user_struct(old_act, arg3, 1);
             }
+       #else
+           struct target_sigaction act, oact, *pact, *old_act;
+
+           if (arg2) {
+               lock_user_struct(old_act, arg2, 1);
+               act._sa_handler = old_act->_sa_handler;
+               target_siginitset(&act.sa_mask, old_act->sa_mask.sig[0]);
+               act.sa_flags = old_act->sa_flags;
+               unlock_user_struct(old_act, arg2, 0);
+               pact = &act;
+           } else {
+               pact = NULL;
+           }
+
+           ret = get_errno(do_sigaction(arg1, pact, &oact));
+
+           if (!is_error(ret) && arg3) {
+               lock_user_struct(old_act, arg3, 0);
+               old_act->_sa_handler = oact._sa_handler;
+               old_act->sa_flags = oact.sa_flags;
+               old_act->sa_mask.sig[0] = oact.sa_mask.sig[0];
+               old_act->sa_mask.sig[1] = 0;
+               old_act->sa_mask.sig[2] = 0;
+               old_act->sa_mask.sig[3] = 0;
+               unlock_user_struct(old_act, arg3, 1);
+           }
+       #endif
         }
         break;
     case TARGET_NR_rt_sigaction:
-        ret = get_errno(do_sigaction(arg1, (void *)arg2, (void *)arg3));
+        {
+            struct target_sigaction *act;
+            struct target_sigaction *oact;
+
+            if (arg2)
+                lock_user_struct(act, arg2, 1);
+            else
+                act = NULL;
+            if (arg3)
+                lock_user_struct(oact, arg3, 0);
+            else
+                oact = NULL;
+            ret = get_errno(do_sigaction(arg1, act, oact));
+            if (arg2)
+                unlock_user_struct(act, arg2, 0);
+            if (arg3)
+                unlock_user_struct(oact, arg3, 1);
+        }
         break;
     case TARGET_NR_sgetmask:
         {
@@ -1912,9 +2476,8 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         {
             int how = arg1;
             sigset_t set, oldset, *set_ptr;
-            target_ulong *pset = (void *)arg2, *poldset = (void *)arg3;
             
-            if (pset) {
+            if (arg2) {
                 switch(how) {
                 case TARGET_SIG_BLOCK:
                     how = SIG_BLOCK;
@@ -1929,15 +2492,19 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                     ret = -EINVAL;
                     goto fail;
                 }
-                target_to_host_old_sigset(&set, pset);
+                p = lock_user(arg2, sizeof(target_sigset_t), 1);
+                target_to_host_old_sigset(&set, p);
+                unlock_user(p, arg2, 0);
                 set_ptr = &set;
             } else {
                 how = 0;
                 set_ptr = NULL;
             }
             ret = get_errno(sigprocmask(arg1, set_ptr, &oldset));
-            if (!is_error(ret) && poldset) {
-                host_to_target_old_sigset(poldset, &oldset);
+            if (!is_error(ret) && arg3) {
+                p = lock_user(arg3, sizeof(target_sigset_t), 0);
+                host_to_target_old_sigset(p, &oldset);
+                unlock_user(p, arg3, sizeof(target_sigset_t));
             }
         }
         break;
@@ -1945,10 +2512,8 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         {
             int how = arg1;
             sigset_t set, oldset, *set_ptr;
-            target_sigset_t *pset = (void *)arg2;
-            target_sigset_t *poldset = (void *)arg3;
             
-            if (pset) {
+            if (arg2) {
                 switch(how) {
                 case TARGET_SIG_BLOCK:
                     how = SIG_BLOCK;
@@ -1963,15 +2528,19 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                     ret = -EINVAL;
                     goto fail;
                 }
-                target_to_host_sigset(&set, pset);
+                p = lock_user(arg2, sizeof(target_sigset_t), 1);
+                target_to_host_sigset(&set, p);
+                unlock_user(p, arg2, 0);
                 set_ptr = &set;
             } else {
                 how = 0;
                 set_ptr = NULL;
             }
             ret = get_errno(sigprocmask(how, set_ptr, &oldset));
-            if (!is_error(ret) && poldset) {
-                host_to_target_sigset(poldset, &oldset);
+            if (!is_error(ret) && arg3) {
+                p = lock_user(arg3, sizeof(target_sigset_t), 0);
+                host_to_target_sigset(p, &oldset);
+                unlock_user(p, arg3, sizeof(target_sigset_t));
             }
         }
         break;
@@ -1980,7 +2549,9 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
             sigset_t set;
             ret = get_errno(sigpending(&set));
             if (!is_error(ret)) {
-                host_to_target_old_sigset((target_ulong *)arg1, &set);
+                p = lock_user(arg1, sizeof(target_sigset_t), 0);
+                host_to_target_old_sigset(p, &set);
+                unlock_user(p, arg1, sizeof(target_sigset_t));
             }
         }
         break;
@@ -1989,51 +2560,59 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
             sigset_t set;
             ret = get_errno(sigpending(&set));
             if (!is_error(ret)) {
-                host_to_target_sigset((target_sigset_t *)arg1, &set);
+                p = lock_user(arg1, sizeof(target_sigset_t), 0);
+                host_to_target_sigset(p, &set);
+                unlock_user(p, arg1, sizeof(target_sigset_t));
             }
         }
         break;
     case TARGET_NR_sigsuspend:
         {
             sigset_t set;
-            target_to_host_old_sigset(&set, (target_ulong *)arg1);
+            p = lock_user(arg1, sizeof(target_sigset_t), 1);
+            target_to_host_old_sigset(&set, p);
+            unlock_user(p, arg1, 0);
             ret = get_errno(sigsuspend(&set));
         }
         break;
     case TARGET_NR_rt_sigsuspend:
         {
             sigset_t set;
-            target_to_host_sigset(&set, (target_sigset_t *)arg1);
+            p = lock_user(arg1, sizeof(target_sigset_t), 1);
+            target_to_host_sigset(&set, p);
+            unlock_user(p, arg1, 0);
             ret = get_errno(sigsuspend(&set));
         }
         break;
     case TARGET_NR_rt_sigtimedwait:
         {
-            target_sigset_t *target_set = (void *)arg1;
-            target_siginfo_t *target_uinfo = (void *)arg2;
-            struct target_timespec *target_uts = (void *)arg3;
             sigset_t set;
             struct timespec uts, *puts;
             siginfo_t uinfo;
             
-            target_to_host_sigset(&set, target_set);
-            if (target_uts) {
+            p = lock_user(arg1, sizeof(target_sigset_t), 1);
+            target_to_host_sigset(&set, p);
+            unlock_user(p, arg1, 0);
+            if (arg3) {
                 puts = &uts;
-                puts->tv_sec = tswapl(target_uts->tv_sec);
-                puts->tv_nsec = tswapl(target_uts->tv_nsec);
+                target_to_host_timespec(puts, arg3);
             } else {
                 puts = NULL;
             }
             ret = get_errno(sigtimedwait(&set, &uinfo, puts));
-            if (!is_error(ret) && target_uinfo) {
-                host_to_target_siginfo(target_uinfo, &uinfo);
+            if (!is_error(ret) && arg2) {
+                p = lock_user(arg2, sizeof(target_sigset_t), 0);
+                host_to_target_siginfo(p, &uinfo);
+                unlock_user(p, arg2, sizeof(target_sigset_t));
             }
         }
         break;
     case TARGET_NR_rt_sigqueueinfo:
         {
             siginfo_t uinfo;
-            target_to_host_siginfo(&uinfo, (target_siginfo_t *)arg3);
+            p = lock_user(arg3, sizeof(target_sigset_t), 1);
+            target_to_host_siginfo(&uinfo, p);
+            unlock_user(p, arg1, 0);
             ret = get_errno(sys_rt_sigqueueinfo(arg1, arg2, &uinfo));
         }
         break;
@@ -2046,16 +2625,20 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         ret = do_rt_sigreturn(cpu_env);
         break;
     case TARGET_NR_sethostname:
-        ret = get_errno(sethostname((const char *)arg1, arg2));
+        p = lock_user_string(arg1);
+        ret = get_errno(sethostname(p, arg2));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_setrlimit:
         {
             /* XXX: convert resource ? */
             int resource = arg1;
-            struct target_rlimit *target_rlim = (void *)arg2;
+            struct target_rlimit *target_rlim;
             struct rlimit rlim;
+            lock_user_struct(target_rlim, arg2, 1);
             rlim.rlim_cur = tswapl(target_rlim->rlim_cur);
             rlim.rlim_max = tswapl(target_rlim->rlim_max);
+            unlock_user_struct(target_rlim, arg2, 0);
             ret = get_errno(setrlimit(resource, &rlim));
         }
         break;
@@ -2063,86 +2646,109 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         {
             /* XXX: convert resource ? */
             int resource = arg1;
-            struct target_rlimit *target_rlim = (void *)arg2;
+            struct target_rlimit *target_rlim;
             struct rlimit rlim;
             
             ret = get_errno(getrlimit(resource, &rlim));
             if (!is_error(ret)) {
-                target_rlim->rlim_cur = tswapl(rlim.rlim_cur);
-                target_rlim->rlim_max = tswapl(rlim.rlim_max);
+                lock_user_struct(target_rlim, arg2, 0);
+                rlim.rlim_cur = tswapl(target_rlim->rlim_cur);
+                rlim.rlim_max = tswapl(target_rlim->rlim_max);
+                unlock_user_struct(target_rlim, arg2, 1);
             }
         }
         break;
     case TARGET_NR_getrusage:
         {
             struct rusage rusage;
-            struct target_rusage *target_rusage = (void *)arg2;
             ret = get_errno(getrusage(arg1, &rusage));
             if (!is_error(ret)) {
-                host_to_target_rusage(target_rusage, &rusage);
+                host_to_target_rusage(arg2, &rusage);
             }
         }
         break;
     case TARGET_NR_gettimeofday:
         {
-            struct target_timeval *target_tv = (void *)arg1;
             struct timeval tv;
             ret = get_errno(gettimeofday(&tv, NULL));
             if (!is_error(ret)) {
-                host_to_target_timeval(target_tv, &tv);
+                host_to_target_timeval(arg1, &tv);
             }
         }
         break;
     case TARGET_NR_settimeofday:
         {
-            struct target_timeval *target_tv = (void *)arg1;
             struct timeval tv;
-            target_to_host_timeval(&tv, target_tv);
+            target_to_host_timeval(&tv, arg1);
             ret = get_errno(settimeofday(&tv, NULL));
         }
         break;
+#ifdef TARGET_NR_select
     case TARGET_NR_select:
         {
-            struct target_sel_arg_struct *sel = (void *)arg1;
-            sel->n = tswapl(sel->n);
-            sel->inp = tswapl(sel->inp);
-            sel->outp = tswapl(sel->outp);
-            sel->exp = tswapl(sel->exp);
-            sel->tvp = tswapl(sel->tvp);
-            ret = do_select(sel->n, (void *)sel->inp, (void *)sel->outp,
-                            (void *)sel->exp, (void *)sel->tvp);
+            struct target_sel_arg_struct *sel;
+            target_ulong inp, outp, exp, tvp;
+            long nsel;
+
+            lock_user_struct(sel, arg1, 1);
+            nsel = tswapl(sel->n);
+            inp = tswapl(sel->inp);
+            outp = tswapl(sel->outp);
+            exp = tswapl(sel->exp);
+            tvp = tswapl(sel->tvp);
+            unlock_user_struct(sel, arg1, 0);
+            ret = do_select(nsel, inp, outp, exp, tvp);
         }
         break;
+#endif
     case TARGET_NR_symlink:
-        ret = get_errno(symlink((const char *)arg1, (const char *)arg2));
+        {
+            void *p2;
+            p = lock_user_string(arg1);
+            p2 = lock_user_string(arg2);
+            ret = get_errno(symlink(p, p2));
+            unlock_user(p2, arg2, 0);
+            unlock_user(p, arg1, 0);
+        }
         break;
 #ifdef TARGET_NR_oldlstat
     case TARGET_NR_oldlstat:
         goto unimplemented;
 #endif
     case TARGET_NR_readlink:
-        ret = get_errno(readlink(path((const char *)arg1), (char *)arg2, arg3));
+        {
+            void *p2;
+            p = lock_user_string(arg1);
+            p2 = lock_user(arg2, arg3, 0);
+            ret = get_errno(readlink(path(p), p2, arg3));
+            unlock_user(p2, arg2, ret);
+            unlock_user(p, arg1, 0);
+        }
         break;
     case TARGET_NR_uselib:
         goto unimplemented;
     case TARGET_NR_swapon:
-        ret = get_errno(swapon((const char *)arg1, arg2));
+        p = lock_user_string(arg1);
+        ret = get_errno(swapon(p, arg2));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_reboot:
         goto unimplemented;
     case TARGET_NR_readdir:
         goto unimplemented;
     case TARGET_NR_mmap:
-#if defined(TARGET_I386) || defined(TARGET_ARM)
-        {
-            uint32_t v1, v2, v3, v4, v5, v6, *vptr;
-            vptr = (uint32_t *)arg1;
-            v1 = tswap32(vptr[0]);
-            v2 = tswap32(vptr[1]);
-            v3 = tswap32(vptr[2]);
-            v4 = tswap32(vptr[3]);
-            v5 = tswap32(vptr[4]);
-            v6 = tswap32(vptr[5]);
+#if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_M68K)
+        {
+            target_ulong *v;
+            target_ulong v1, v2, v3, v4, v5, v6;
+            v = lock_user(arg1, 6 * sizeof(target_ulong), 1);
+            v1 = tswapl(v[0]);
+            v2 = tswapl(v[1]);
+            v3 = tswapl(v[2]);
+            v4 = tswapl(v[3]);
+            v5 = tswapl(v[4]);
+            v6 = tswapl(v[5]);
+            unlock_user(v, arg1, 0);
             ret = get_errno(target_mmap(v1, v2, v3, 
                                         target_to_host_bitmask(v4, mmap_flags_tbl),
                                         v5, v6));
@@ -2154,8 +2760,9 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                                     arg6));
 #endif
         break;
+#ifdef TARGET_NR_mmap2
     case TARGET_NR_mmap2:
-#if defined(TARGET_SPARC)
+#if defined(TARGET_SPARC) || defined(TARGET_MIPS)
 #define MMAP_SHIFT 12
 #else
 #define MMAP_SHIFT TARGET_PAGE_BITS
@@ -2165,6 +2772,7 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                                     arg5,
                                     arg6 << MMAP_SHIFT));
         break;
+#endif
     case TARGET_NR_munmap:
         ret = get_errno(target_munmap(arg1, arg2));
         break;
@@ -2174,14 +2782,15 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
     case TARGET_NR_mremap:
         ret = get_errno(target_mremap(arg1, arg2, arg3, arg4, arg5));
         break;
+        /* ??? msync/mlock/munlock are broken for softmmu.  */
     case TARGET_NR_msync:
-        ret = get_errno(msync((void *)arg1, arg2, arg3));
+        ret = get_errno(msync(g2h(arg1), arg2, arg3));
         break;
     case TARGET_NR_mlock:
-        ret = get_errno(mlock((void *)arg1, arg2));
+        ret = get_errno(mlock(g2h(arg1), arg2));
         break;
     case TARGET_NR_munlock:
-        ret = get_errno(munlock((void *)arg1, arg2));
+        ret = get_errno(munlock(g2h(arg1), arg2));
         break;
     case TARGET_NR_mlockall:
         ret = get_errno(mlockall(arg1));
@@ -2190,7 +2799,9 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         ret = get_errno(munlockall());
         break;
     case TARGET_NR_truncate:
-        ret = get_errno(truncate((const char *)arg1, arg2));
+        p = lock_user_string(arg1);
+        ret = get_errno(truncate(p, arg2));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_ftruncate:
         ret = get_errno(ftruncate(arg1, arg2));
@@ -2209,88 +2820,213 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         goto unimplemented;
 #endif
     case TARGET_NR_statfs:
-        stfs = (void *)arg2;
-        ret = get_errno(sys_statfs(path((const char *)arg1), stfs));
+        p = lock_user_string(arg1);
+        ret = get_errno(statfs(path(p), &stfs));
+        unlock_user(p, arg1, 0);
     convert_statfs:
         if (!is_error(ret)) {
-            tswap32s(&stfs->f_type);
-            tswap32s(&stfs->f_bsize);
-            tswap32s(&stfs->f_blocks);
-            tswap32s(&stfs->f_bfree);
-            tswap32s(&stfs->f_bavail);
-            tswap32s(&stfs->f_files);
-            tswap32s(&stfs->f_ffree);
-            tswap32s(&stfs->f_fsid.val[0]);
-            tswap32s(&stfs->f_fsid.val[1]);
-            tswap32s(&stfs->f_namelen);
+            struct target_statfs *target_stfs;
+            
+            lock_user_struct(target_stfs, arg2, 0);
+            /* ??? put_user is probably wrong.  */
+            put_user(stfs.f_type, &target_stfs->f_type);
+            put_user(stfs.f_bsize, &target_stfs->f_bsize);
+            put_user(stfs.f_blocks, &target_stfs->f_blocks);
+            put_user(stfs.f_bfree, &target_stfs->f_bfree);
+            put_user(stfs.f_bavail, &target_stfs->f_bavail);
+            put_user(stfs.f_files, &target_stfs->f_files);
+            put_user(stfs.f_ffree, &target_stfs->f_ffree);
+            put_user(stfs.f_fsid.__val[0], &target_stfs->f_fsid);
+            put_user(stfs.f_namelen, &target_stfs->f_namelen);
+            unlock_user_struct(target_stfs, arg2, 1);
         }
         break;
     case TARGET_NR_fstatfs:
-        stfs = (void *)arg2;
-        ret = get_errno(sys_fstatfs(arg1, stfs));
+        ret = get_errno(fstatfs(arg1, &stfs));
         goto convert_statfs;
+#ifdef TARGET_NR_statfs64
+    case TARGET_NR_statfs64:
+        p = lock_user_string(arg1);
+        ret = get_errno(statfs(path(p), &stfs));
+        unlock_user(p, arg1, 0);
+    convert_statfs64:
+        if (!is_error(ret)) {
+            struct target_statfs64 *target_stfs;
+            
+            lock_user_struct(target_stfs, arg3, 0);
+            /* ??? put_user is probably wrong.  */
+            put_user(stfs.f_type, &target_stfs->f_type);
+            put_user(stfs.f_bsize, &target_stfs->f_bsize);
+            put_user(stfs.f_blocks, &target_stfs->f_blocks);
+            put_user(stfs.f_bfree, &target_stfs->f_bfree);
+            put_user(stfs.f_bavail, &target_stfs->f_bavail);
+            put_user(stfs.f_files, &target_stfs->f_files);
+            put_user(stfs.f_ffree, &target_stfs->f_ffree);
+            put_user(stfs.f_fsid.__val[0], &target_stfs->f_fsid);
+            put_user(stfs.f_namelen, &target_stfs->f_namelen);
+            unlock_user_struct(target_stfs, arg3, 0);
+        }
+        break;
+    case TARGET_NR_fstatfs64:
+        ret = get_errno(fstatfs(arg1, &stfs));
+        goto convert_statfs64;
+#endif
 #ifdef TARGET_NR_ioperm
     case TARGET_NR_ioperm:
         goto unimplemented;
 #endif
     case TARGET_NR_socketcall:
-        ret = do_socketcall(arg1, (int32_t *)arg2);
+        ret = do_socketcall(arg1, arg2);
+        break;
+
+#ifdef TARGET_NR_accept
+    case TARGET_NR_accept:
+        ret = do_accept(arg1, arg2, arg3);
+        break;
+#endif
+#ifdef TARGET_NR_bind
+    case TARGET_NR_bind:
+        ret = do_bind(arg1, arg2, arg3);
+        break;
+#endif
+#ifdef TARGET_NR_connect
+    case TARGET_NR_connect:
+        ret = do_connect(arg1, arg2, arg3);
+        break;
+#endif
+#ifdef TARGET_NR_getpeername
+    case TARGET_NR_getpeername:
+        ret = do_getpeername(arg1, arg2, arg3);
+        break;
+#endif
+#ifdef TARGET_NR_getsockname
+    case TARGET_NR_getsockname:
+        ret = do_getsockname(arg1, arg2, arg3);
+        break;
+#endif
+#ifdef TARGET_NR_getsockopt
+    case TARGET_NR_getsockopt:
+        ret = do_getsockopt(arg1, arg2, arg3, arg4, arg5);
+        break;
+#endif
+#ifdef TARGET_NR_listen
+    case TARGET_NR_listen:
+        ret = get_errno(listen(arg1, arg2));
+        break;
+#endif
+#ifdef TARGET_NR_recv
+    case TARGET_NR_recv:
+        ret = do_recvfrom(arg1, arg2, arg3, arg4, 0, 0);
+        break;
+#endif
+#ifdef TARGET_NR_recvfrom
+    case TARGET_NR_recvfrom:
+        ret = do_recvfrom(arg1, arg2, arg3, arg4, arg5, arg6);
+        break;
+#endif
+#ifdef TARGET_NR_recvmsg
+    case TARGET_NR_recvmsg:
+        ret = do_sendrecvmsg(arg1, arg2, arg3, 0);
+        break;
+#endif
+#ifdef TARGET_NR_send
+    case TARGET_NR_send:
+        ret = do_sendto(arg1, arg2, arg3, arg4, 0, 0);
+        break;
+#endif
+#ifdef TARGET_NR_sendmsg
+    case TARGET_NR_sendmsg:
+        ret = do_sendrecvmsg(arg1, arg2, arg3, 1);
+        break;
+#endif
+#ifdef TARGET_NR_sendto
+    case TARGET_NR_sendto:
+        ret = do_sendto(arg1, arg2, arg3, arg4, arg5, arg6);
+        break;
+#endif
+#ifdef TARGET_NR_shutdown
+    case TARGET_NR_shutdown:
+        ret = get_errno(shutdown(arg1, arg2));
         break;
+#endif
+#ifdef TARGET_NR_socket
+    case TARGET_NR_socket:
+        ret = do_socket(arg1, arg2, arg3);
+        break;
+#endif
+#ifdef TARGET_NR_socketpair
+    case TARGET_NR_socketpair:
+        ret = do_socketpair(arg1, arg2, arg3, arg4);
+        break;
+#endif
+#ifdef TARGET_NR_setsockopt
+    case TARGET_NR_setsockopt:
+        ret = do_setsockopt(arg1, arg2, arg3, arg4, (socklen_t) arg5);
+        break;
+#endif
+
     case TARGET_NR_syslog:
-        goto unimplemented;
+        p = lock_user_string(arg2);
+        ret = get_errno(sys_syslog((int)arg1, p, (int)arg3));
+        unlock_user(p, arg2, 0);
+        break;
+
     case TARGET_NR_setitimer:
         {
-            struct target_itimerval *target_value = (void *)arg2;
-            struct target_itimerval *target_ovalue = (void *)arg3;
             struct itimerval value, ovalue, *pvalue;
 
-            if (target_value) {
+            if (arg2) {
                 pvalue = &value;
                 target_to_host_timeval(&pvalue->it_interval, 
-                                       &target_value->it_interval);
+                                       arg2);
                 target_to_host_timeval(&pvalue->it_value, 
-                                       &target_value->it_value);
+                                       arg2 + sizeof(struct target_timeval));
             } else {
                 pvalue = NULL;
             }
             ret = get_errno(setitimer(arg1, pvalue, &ovalue));
-            if (!is_error(ret) && target_ovalue) {
-                host_to_target_timeval(&target_ovalue->it_interval, 
+            if (!is_error(ret) && arg3) {
+                host_to_target_timeval(arg3,
                                        &ovalue.it_interval);
-                host_to_target_timeval(&target_ovalue->it_value, 
+                host_to_target_timeval(arg3 + sizeof(struct target_timeval),
                                        &ovalue.it_value);
             }
         }
         break;
     case TARGET_NR_getitimer:
         {
-            struct target_itimerval *target_value = (void *)arg2;
             struct itimerval value;
             
             ret = get_errno(getitimer(arg1, &value));
-            if (!is_error(ret) && target_value) {
-                host_to_target_timeval(&target_value->it_interval, 
+            if (!is_error(ret) && arg2) {
+                host_to_target_timeval(arg2,
                                        &value.it_interval);
-                host_to_target_timeval(&target_value->it_value, 
+                host_to_target_timeval(arg2 + sizeof(struct target_timeval),
                                        &value.it_value);
             }
         }
         break;
     case TARGET_NR_stat:
-        ret = get_errno(stat(path((const char *)arg1), &st));
+        p = lock_user_string(arg1);
+        ret = get_errno(stat(path(p), &st));
+        unlock_user(p, arg1, 0);
         goto do_stat;
     case TARGET_NR_lstat:
-        ret = get_errno(lstat(path((const char *)arg1), &st));
+        p = lock_user_string(arg1);
+        ret = get_errno(lstat(path(p), &st));
+        unlock_user(p, arg1, 0);
         goto do_stat;
     case TARGET_NR_fstat:
         {
             ret = get_errno(fstat(arg1, &st));
         do_stat:
             if (!is_error(ret)) {
-                struct target_stat *target_st = (void *)arg2;
+                struct target_stat *target_st;
+                
+                lock_user_struct(target_st, arg2, 0);
                 target_st->st_dev = tswap16(st.st_dev);
                 target_st->st_ino = tswapl(st.st_ino);
-#if defined(TARGET_PPC)
+#if defined(TARGET_PPC) || defined(TARGET_MIPS)
                 target_st->st_mode = tswapl(st.st_mode); /* XXX: check this */
                 target_st->st_uid = tswap32(st.st_uid);
                 target_st->st_gid = tswap32(st.st_gid);
@@ -2307,6 +3043,7 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                 target_st->target_st_atime = tswapl(st.st_atime);
                 target_st->target_st_mtime = tswapl(st.st_mtime);
                 target_st->target_st_ctime = tswapl(st.st_ctime);
+                unlock_user_struct(target_st, arg2, 1);
             }
         }
         break;
@@ -2325,12 +3062,17 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
     case TARGET_NR_idle:
         goto unimplemented;
 #endif
+#ifdef TARGET_NR_syscall
+    case TARGET_NR_syscall:
+       ret = do_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
+       break;
+#endif
     case TARGET_NR_wait4:
         {
             int status;
-            target_long *status_ptr = (void *)arg2;
+            target_long status_ptr = arg2;
             struct rusage rusage, *rusage_ptr;
-            struct target_rusage *target_rusage = (void *)arg4;
+            target_ulong target_rusage = arg4;
             if (target_rusage)
                 rusage_ptr = &rusage;
             else
@@ -2338,7 +3080,7 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
             ret = get_errno(wait4(arg1, &status, arg3, rusage_ptr));
             if (!is_error(ret)) {
                 if (status_ptr)
-                    *status_ptr = tswap32(status);
+                    tputl(status_ptr, status);
                 if (target_rusage) {
                     host_to_target_rusage(target_rusage, &rusage);
                 }
@@ -2346,15 +3088,19 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         }
         break;
     case TARGET_NR_swapoff:
-        ret = get_errno(swapoff((const char *)arg1));
+        p = lock_user_string(arg1);
+        ret = get_errno(swapoff(p));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_sysinfo:
         {
-            struct target_sysinfo *target_value = (void *)arg1;
+            struct target_sysinfo *target_value;
             struct sysinfo value;
             ret = get_errno(sysinfo(&value));
-            if (!is_error(ret) && target_value)
+            if (!is_error(ret) && arg1)
             {
+                /* ??? __put_user is probably wrong.  */
+                lock_user_struct(target_value, arg1, 0);
                 __put_user(value.uptime, &target_value->uptime);
                 __put_user(value.loads[0], &target_value->loads[0]);
                 __put_user(value.loads[1], &target_value->loads[1]);
@@ -2369,6 +3115,7 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                 __put_user(value.totalhigh, &target_value->totalhigh);
                 __put_user(value.freehigh, &target_value->freehigh);
                 __put_user(value.mem_unit, &target_value->mem_unit);
+                unlock_user_struct(target_value, arg1, 1);
             }
         }
         break;
@@ -2384,34 +3131,41 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
 #ifdef __NR_exit_group
         /* new thread calls */
     case TARGET_NR_exit_group:
+        gdb_exit(cpu_env, arg1);
         ret = get_errno(exit_group(arg1));
         break;
 #endif
     case TARGET_NR_setdomainname:
-        ret = get_errno(setdomainname((const char *)arg1, arg2));
+        p = lock_user_string(arg1);
+        ret = get_errno(setdomainname(p, arg2));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_uname:
         /* no need to transcode because we use the linux syscall */
         {
             struct new_utsname * buf;
     
-            buf = (struct new_utsname *)arg1;
+            lock_user_struct(buf, arg1, 0);
             ret = get_errno(sys_uname(buf));
             if (!is_error(ret)) {
                 /* Overrite the native machine name with whatever is being
                    emulated. */
                 strcpy (buf->machine, UNAME_MACHINE);
+                /* Allow the user to override the reported release.  */
+                if (qemu_uname_release && *qemu_uname_release)
+                  strcpy (buf->release, qemu_uname_release);
             }
+            unlock_user_struct(buf, arg1, 1);
         }
         break;
 #ifdef TARGET_I386
     case TARGET_NR_modify_ldt:
-        ret = get_errno(do_modify_ldt(cpu_env, arg1, (void *)arg2, arg3));
+        ret = get_errno(do_modify_ldt(cpu_env, arg1, arg2, arg3));
         break;
     case TARGET_NR_vm86old:
         goto unimplemented;
     case TARGET_NR_vm86:
-        ret = do_vm86(cpu_env, arg1, (void *)arg2);
+        ret = do_vm86(cpu_env, arg1, arg2);
         break;
 #endif
     case TARGET_NR_adjtimex:
@@ -2442,20 +3196,21 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         {
 #if defined (__x86_64__)
             ret = get_errno(lseek(arg1, ((uint64_t )arg2 << 32) | arg3, arg5));
-            *(int64_t *)arg4 = ret;
+            tput64(arg4, ret);
 #else
             int64_t res;
             ret = get_errno(_llseek(arg1, arg2, arg3, &res, arg5));
-            *(int64_t *)arg4 = tswap64(res);
+            tput64(arg4, res);
 #endif
         }
         break;
     case TARGET_NR_getdents:
 #if TARGET_LONG_SIZE != 4
-#error not supported
+        goto unimplemented;
+#warning not supported
 #elif TARGET_LONG_SIZE == 4 && HOST_LONG_SIZE == 8
         {
-            struct target_dirent *target_dirp = (void *)arg2;
+            struct target_dirent *target_dirp;
             struct dirent *dirp;
             long count = arg3;
 
@@ -2473,6 +3228,7 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
 
                count1 = 0;
                 de = dirp;
+                target_dirp = lock_user(arg2, count, 0);
                tde = target_dirp;
                 while (len > 0) {
                     reclen = de->d_reclen;
@@ -2483,6 +3239,7 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                    tnamelen = treclen - (2 * sizeof(target_long) + 2);
                    if (tnamelen > 256)
                         tnamelen = 256;
+                    /* XXX: may not be correct */
                    strncpy(tde->d_name, de->d_name, tnamelen);
                     de = (struct dirent *)((char *)de + reclen);
                     len -= reclen;
@@ -2491,13 +3248,15 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                 }
                ret = count1;
             }
+            unlock_user(target_dirp, arg2, ret);
            free(dirp);
         }
 #else
         {
-            struct dirent *dirp = (void *)arg2;
+            struct dirent *dirp;
             long count = arg3;
 
+            dirp = lock_user(arg2, count, 0);
             ret = get_errno(sys_getdents(arg1, dirp, count));
             if (!is_error(ret)) {
                 struct dirent *de;
@@ -2515,14 +3274,16 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                     len -= reclen;
                 }
             }
+            unlock_user(dirp, arg2, ret);
         }
 #endif
         break;
 #ifdef TARGET_NR_getdents64
     case TARGET_NR_getdents64:
         {
-            struct dirent64 *dirp = (void *)arg2;
+            struct dirent64 *dirp;
             long count = arg3;
+            dirp = lock_user(arg2, count, 0);
             ret = get_errno(sys_getdents64(arg1, dirp, count));
             if (!is_error(ret)) {
                 struct dirent64 *de;
@@ -2540,21 +3301,22 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                     len -= reclen;
                 }
             }
+            unlock_user(dirp, arg2, ret);
         }
         break;
 #endif /* TARGET_NR_getdents64 */
     case TARGET_NR__newselect:
-        ret = do_select(arg1, (void *)arg2, (void *)arg3, (void *)arg4, 
-                        (void *)arg5);
+        ret = do_select(arg1, arg2, arg3, arg4, arg5);
         break;
     case TARGET_NR_poll:
         {
-            struct target_pollfd *target_pfd = (void *)arg1;
+            struct target_pollfd *target_pfd;
             unsigned int nfds = arg2;
             int timeout = arg3;
             struct pollfd *pfd;
             unsigned int i;
 
+            target_pfd = lock_user(arg1, sizeof(struct target_pollfd) * nfds, 1);
             pfd = alloca(sizeof(struct pollfd) * nfds);
             for(i = 0; i < nfds; i++) {
                 pfd[i].fd = tswap32(target_pfd[i].fd);
@@ -2565,7 +3327,10 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
                 for(i = 0; i < nfds; i++) {
                     target_pfd[i].revents = tswap16(pfd[i].revents);
                 }
+                ret += nfds * (sizeof(struct target_pollfd)
+                               - sizeof(struct pollfd));
             }
+            unlock_user(target_pfd, arg1, ret);
         }
         break;
     case TARGET_NR_flock:
@@ -2576,31 +3341,23 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
     case TARGET_NR_readv:
         {
             int count = arg3;
-            int i;
             struct iovec *vec;
-            struct target_iovec *target_vec = (void *)arg2;
 
             vec = alloca(count * sizeof(struct iovec));
-            for(i = 0;i < count; i++) {
-                vec[i].iov_base = (void *)tswapl(target_vec[i].iov_base);
-                vec[i].iov_len = tswapl(target_vec[i].iov_len);
-            }
+            lock_iovec(vec, arg2, count, 0);
             ret = get_errno(readv(arg1, vec, count));
+            unlock_iovec(vec, arg2, count, 1);
         }
         break;
     case TARGET_NR_writev:
         {
             int count = arg3;
-            int i;
             struct iovec *vec;
-            struct target_iovec *target_vec = (void *)arg2;
 
             vec = alloca(count * sizeof(struct iovec));
-            for(i = 0;i < count; i++) {
-                vec[i].iov_base = (void *)tswapl(target_vec[i].iov_base);
-                vec[i].iov_len = tswapl(target_vec[i].iov_len);
-            }
+            lock_iovec(vec, arg2, count, 1);
             ret = get_errno(writev(arg1, vec, count));
+            unlock_iovec(vec, arg2, count, 0);
         }
         break;
     case TARGET_NR_getsid:
@@ -2615,27 +3372,34 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         return -ENOTDIR;
     case TARGET_NR_sched_setparam:
         {
-            struct sched_param *target_schp = (void *)arg2;
+            struct sched_param *target_schp;
             struct sched_param schp;
+
+            lock_user_struct(target_schp, arg2, 1);
             schp.sched_priority = tswap32(target_schp->sched_priority);
+            unlock_user_struct(target_schp, arg2, 0);
             ret = get_errno(sched_setparam(arg1, &schp));
         }
         break;
     case TARGET_NR_sched_getparam:
         {
-            struct sched_param *target_schp = (void *)arg2;
+            struct sched_param *target_schp;
             struct sched_param schp;
             ret = get_errno(sched_getparam(arg1, &schp));
             if (!is_error(ret)) {
+                lock_user_struct(target_schp, arg2, 0);
                 target_schp->sched_priority = tswap32(schp.sched_priority);
+                unlock_user_struct(target_schp, arg2, 1);
             }
         }
         break;
     case TARGET_NR_sched_setscheduler:
         {
-            struct sched_param *target_schp = (void *)arg3;
+            struct sched_param *target_schp;
             struct sched_param schp;
+            lock_user_struct(target_schp, arg3, 1);
             schp.sched_priority = tswap32(target_schp->sched_priority);
+            unlock_user_struct(target_schp, arg3, 0);
             ret = get_errno(sched_setscheduler(arg1, arg2, &schp));
         }
         break;
@@ -2653,26 +3417,20 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         break;
     case TARGET_NR_sched_rr_get_interval:
         {
-            struct target_timespec *target_ts = (void *)arg2;
             struct timespec ts;
             ret = get_errno(sched_rr_get_interval(arg1, &ts));
             if (!is_error(ret)) {
-                target_ts->tv_sec = tswapl(ts.tv_sec);
-                target_ts->tv_nsec = tswapl(ts.tv_nsec);
+                host_to_target_timespec(arg2, &ts);
             }
         }
         break;
     case TARGET_NR_nanosleep:
         {
-            struct target_timespec *target_req = (void *)arg1;
-            struct target_timespec *target_rem = (void *)arg2;
             struct timespec req, rem;
-            req.tv_sec = tswapl(target_req->tv_sec);
-            req.tv_nsec = tswapl(target_req->tv_nsec);
+            target_to_host_timespec(&req, arg1);
             ret = get_errno(nanosleep(&req, &rem));
-            if (is_error(ret) && target_rem) {
-                target_rem->tv_sec = tswapl(rem.tv_sec);
-                target_rem->tv_nsec = tswapl(rem.tv_nsec);
+            if (is_error(ret) && arg2) {
+                host_to_target_timespec(arg2, &rem);
             }
         }
         break;
@@ -2681,18 +3439,38 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
     case TARGET_NR_nfsservctl:
         goto unimplemented;
     case TARGET_NR_prctl:
-        goto unimplemented;
+        switch (arg1)
+            {
+            case PR_GET_PDEATHSIG:
+                {
+                    int deathsig;
+                    ret = get_errno(prctl(arg1, &deathsig, arg3, arg4, arg5));
+                    if (!is_error(ret) && arg2)
+                        tput32(arg2, deathsig);
+                }
+                break;
+            default:
+                ret = get_errno(prctl(arg1, arg2, arg3, arg4, arg5));
+                break;
+            }
+        break;
 #ifdef TARGET_NR_pread
     case TARGET_NR_pread:
-        page_unprotect_range((void *)arg2, arg3);
-        ret = get_errno(pread(arg1, (void *)arg2, arg3, arg4));
+        page_unprotect_range(arg2, arg3);
+        p = lock_user(arg2, arg3, 0);
+        ret = get_errno(pread(arg1, p, arg3, arg4));
+        unlock_user(p, arg2, ret);
         break;
     case TARGET_NR_pwrite:
-        ret = get_errno(pwrite(arg1, (void *)arg2, arg3, arg4));
+        p = lock_user(arg2, arg3, 1);
+        ret = get_errno(pwrite(arg1, p, arg3, arg4));
+        unlock_user(p, arg2, 0);
         break;
 #endif
     case TARGET_NR_getcwd:
-        ret = get_errno(sys_getcwd1((char *)arg1, arg2));
+        p = lock_user(arg1, arg2, 0);
+        ret = get_errno(sys_getcwd1(p, arg2));
+        unlock_user(p, arg1, ret);
         break;
     case TARGET_NR_capget:
         goto unimplemented;
@@ -2710,63 +3488,117 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
     case TARGET_NR_putpmsg:
         goto unimplemented;
 #endif
+#ifdef TARGET_NR_vfork
     case TARGET_NR_vfork:
         ret = get_errno(do_fork(cpu_env, CLONE_VFORK | CLONE_VM | SIGCHLD, 0));
         break;
+#endif
 #ifdef TARGET_NR_ugetrlimit
     case TARGET_NR_ugetrlimit:
     {
        struct rlimit rlim;
        ret = get_errno(getrlimit(arg1, &rlim));
        if (!is_error(ret)) {
-           struct target_rlimit *target_rlim = (void *)arg2;
+           struct target_rlimit *target_rlim;
+            lock_user_struct(target_rlim, arg2, 0);
            target_rlim->rlim_cur = tswapl(rlim.rlim_cur);
            target_rlim->rlim_max = tswapl(rlim.rlim_max);
+            unlock_user_struct(target_rlim, arg2, 1);
        }
        break;
     }
 #endif
+#ifdef TARGET_NR_truncate64
     case TARGET_NR_truncate64:
-        goto unimplemented;
+        p = lock_user_string(arg1);
+       ret = target_truncate64(cpu_env, p, arg2, arg3, arg4);
+        unlock_user(p, arg1, 0);
+       break;
+#endif
+#ifdef TARGET_NR_ftruncate64
     case TARGET_NR_ftruncate64:
-        goto unimplemented;
+       ret = target_ftruncate64(cpu_env, arg1, arg2, arg3, arg4);
+       break;
+#endif
+#ifdef TARGET_NR_stat64
     case TARGET_NR_stat64:
-        ret = get_errno(stat(path((const char *)arg1), &st));
+        p = lock_user_string(arg1);
+        ret = get_errno(stat(path(p), &st));
+        unlock_user(p, arg1, 0);
         goto do_stat64;
+#endif
+#ifdef TARGET_NR_lstat64
     case TARGET_NR_lstat64:
-        ret = get_errno(lstat(path((const char *)arg1), &st));
+        p = lock_user_string(arg1);
+        ret = get_errno(lstat(path(p), &st));
+        unlock_user(p, arg1, 0);
         goto do_stat64;
+#endif
+#ifdef TARGET_NR_fstat64
     case TARGET_NR_fstat64:
         {
             ret = get_errno(fstat(arg1, &st));
         do_stat64:
             if (!is_error(ret)) {
-                struct target_stat64 *target_st = (void *)arg2;
-                memset(target_st, 0, sizeof(struct target_stat64));
-                put_user(st.st_dev, &target_st->st_dev);
-                put_user(st.st_ino, &target_st->st_ino);
+#ifdef TARGET_ARM
+                if (((CPUARMState *)cpu_env)->eabi) {
+                    struct target_eabi_stat64 *target_st;
+                    lock_user_struct(target_st, arg2, 1);
+                    memset(target_st, 0, sizeof(struct target_eabi_stat64));
+                    /* put_user is probably wrong.  */
+                    put_user(st.st_dev, &target_st->st_dev);
+                    put_user(st.st_ino, &target_st->st_ino);
+#ifdef TARGET_STAT64_HAS_BROKEN_ST_INO
+                    put_user(st.st_ino, &target_st->__st_ino);
+#endif
+                    put_user(st.st_mode, &target_st->st_mode);
+                    put_user(st.st_nlink, &target_st->st_nlink);
+                    put_user(st.st_uid, &target_st->st_uid);
+                    put_user(st.st_gid, &target_st->st_gid);
+                    put_user(st.st_rdev, &target_st->st_rdev);
+                    /* XXX: better use of kernel struct */
+                    put_user(st.st_size, &target_st->st_size);
+                    put_user(st.st_blksize, &target_st->st_blksize);
+                    put_user(st.st_blocks, &target_st->st_blocks);
+                    put_user(st.st_atime, &target_st->target_st_atime);
+                    put_user(st.st_mtime, &target_st->target_st_mtime);
+                    put_user(st.st_ctime, &target_st->target_st_ctime);
+                    unlock_user_struct(target_st, arg2, 0);
+                } else
+#endif
+                {
+                    struct target_stat64 *target_st;
+                    lock_user_struct(target_st, arg2, 1);
+                    memset(target_st, 0, sizeof(struct target_stat64));
+                    /* ??? put_user is probably wrong.  */
+                    put_user(st.st_dev, &target_st->st_dev);
+                    put_user(st.st_ino, &target_st->st_ino);
 #ifdef TARGET_STAT64_HAS_BROKEN_ST_INO
-                put_user(st.st_ino, &target_st->__st_ino);
-#endif
-                put_user(st.st_mode, &target_st->st_mode);
-                put_user(st.st_nlink, &target_st->st_nlink);
-                put_user(st.st_uid, &target_st->st_uid);
-                put_user(st.st_gid, &target_st->st_gid);
-                put_user(st.st_rdev, &target_st->st_rdev);
-                /* XXX: better use of kernel struct */
-                put_user(st.st_size, &target_st->st_size);
-                put_user(st.st_blksize, &target_st->st_blksize);
-                put_user(st.st_blocks, &target_st->st_blocks);
-                put_user(st.st_atime, &target_st->target_st_atime);
-                put_user(st.st_mtime, &target_st->target_st_mtime);
-                put_user(st.st_ctime, &target_st->target_st_ctime);
+                    put_user(st.st_ino, &target_st->__st_ino);
+#endif
+                    put_user(st.st_mode, &target_st->st_mode);
+                    put_user(st.st_nlink, &target_st->st_nlink);
+                    put_user(st.st_uid, &target_st->st_uid);
+                    put_user(st.st_gid, &target_st->st_gid);
+                    put_user(st.st_rdev, &target_st->st_rdev);
+                    /* XXX: better use of kernel struct */
+                    put_user(st.st_size, &target_st->st_size);
+                    put_user(st.st_blksize, &target_st->st_blksize);
+                    put_user(st.st_blocks, &target_st->st_blocks);
+                    put_user(st.st_atime, &target_st->target_st_atime);
+                    put_user(st.st_mtime, &target_st->target_st_mtime);
+                    put_user(st.st_ctime, &target_st->target_st_ctime);
+                    unlock_user_struct(target_st, arg2, 0);
+                }
             }
         }
         break;
-
+#endif
 #ifdef USE_UID16
     case TARGET_NR_lchown:
-        ret = get_errno(lchown((const char *)arg1, low2highuid(arg2), low2highgid(arg3)));
+        p = lock_user_string(arg1);
+        ret = get_errno(lchown(p, low2highuid(arg2), low2highgid(arg3)));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_getuid:
         ret = get_errno(high2lowuid(getuid()));
@@ -2789,28 +3621,32 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
     case TARGET_NR_getgroups:
         {
             int gidsetsize = arg1;
-            uint16_t *target_grouplist = (void *)arg2;
+            uint16_t *target_grouplist;
             gid_t *grouplist;
             int i;
 
             grouplist = alloca(gidsetsize * sizeof(gid_t));
             ret = get_errno(getgroups(gidsetsize, grouplist));
             if (!is_error(ret)) {
+                target_grouplist = lock_user(arg2, gidsetsize * 2, 0);
                 for(i = 0;i < gidsetsize; i++)
                     target_grouplist[i] = tswap16(grouplist[i]);
+                unlock_user(target_grouplist, arg2, gidsetsize * 2);
             }
         }
         break;
     case TARGET_NR_setgroups:
         {
             int gidsetsize = arg1;
-            uint16_t *target_grouplist = (void *)arg2;
+            uint16_t *target_grouplist;
             gid_t *grouplist;
             int i;
 
             grouplist = alloca(gidsetsize * sizeof(gid_t));
+            target_grouplist = lock_user(arg2, gidsetsize * 2, 1);
             for(i = 0;i < gidsetsize; i++)
                 grouplist[i] = tswap16(target_grouplist[i]);
+            unlock_user(target_grouplist, arg2, 0);
             ret = get_errno(setgroups(gidsetsize, grouplist));
         }
         break;
@@ -2827,12 +3663,12 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
 #ifdef TARGET_NR_getresuid
     case TARGET_NR_getresuid:
         {
-            int ruid, euid, suid;
+            uid_t ruid, euid, suid;
             ret = get_errno(getresuid(&ruid, &euid, &suid));
             if (!is_error(ret)) {
-                *(uint16_t *)arg1 = tswap16(high2lowuid(ruid));
-                *(uint16_t *)arg2 = tswap16(high2lowuid(euid));
-                *(uint16_t *)arg3 = tswap16(high2lowuid(suid));
+                tput16(arg1, tswap16(high2lowuid(ruid)));
+                tput16(arg2, tswap16(high2lowuid(euid)));
+                tput16(arg3, tswap16(high2lowuid(suid)));
             }
         }
         break;
@@ -2847,18 +3683,20 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
 #ifdef TARGET_NR_getresgid
     case TARGET_NR_getresgid:
         {
-            int rgid, egid, sgid;
+            gid_t rgid, egid, sgid;
             ret = get_errno(getresgid(&rgid, &egid, &sgid));
             if (!is_error(ret)) {
-                *(uint16_t *)arg1 = tswap16(high2lowgid(rgid));
-                *(uint16_t *)arg2 = tswap16(high2lowgid(egid));
-                *(uint16_t *)arg3 = tswap16(high2lowgid(sgid));
+                tput16(arg1, tswap16(high2lowgid(rgid)));
+                tput16(arg2, tswap16(high2lowgid(egid)));
+                tput16(arg3, tswap16(high2lowgid(sgid)));
             }
         }
         break;
 #endif
     case TARGET_NR_chown:
-        ret = get_errno(chown((const char *)arg1, low2highuid(arg2), low2highgid(arg3)));
+        p = lock_user_string(arg1);
+        ret = get_errno(chown(p, low2highuid(arg2), low2highgid(arg3)));
+        unlock_user(p, arg1, 0);
         break;
     case TARGET_NR_setuid:
         ret = get_errno(setuid(low2highuid(arg1)));
@@ -2874,77 +3712,147 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
         break;
 #endif /* USE_UID16 */
 
+#ifdef TARGET_NR_lchown32
     case TARGET_NR_lchown32:
-        ret = get_errno(lchown((const char *)arg1, arg2, arg3));
+        p = lock_user_string(arg1);
+        ret = get_errno(lchown(p, arg2, arg3));
+        unlock_user(p, arg1, 0);
         break;
+#endif
+#ifdef TARGET_NR_getuid32
     case TARGET_NR_getuid32:
         ret = get_errno(getuid());
         break;
+#endif
+#ifdef TARGET_NR_getgid32
     case TARGET_NR_getgid32:
         ret = get_errno(getgid());
         break;
+#endif
+#ifdef TARGET_NR_geteuid32
     case TARGET_NR_geteuid32:
         ret = get_errno(geteuid());
         break;
+#endif
+#ifdef TARGET_NR_getegid32
     case TARGET_NR_getegid32:
         ret = get_errno(getegid());
         break;
+#endif
+#ifdef TARGET_NR_setreuid32
     case TARGET_NR_setreuid32:
         ret = get_errno(setreuid(arg1, arg2));
         break;
+#endif
+#ifdef TARGET_NR_setregid32
     case TARGET_NR_setregid32:
         ret = get_errno(setregid(arg1, arg2));
         break;
+#endif
+#ifdef TARGET_NR_getgroups32
     case TARGET_NR_getgroups32:
-        goto unimplemented;
+        {
+            int gidsetsize = arg1;
+            uint32_t *target_grouplist;
+            gid_t *grouplist;
+            int i;
+
+            grouplist = alloca(gidsetsize * sizeof(gid_t));
+            ret = get_errno(getgroups(gidsetsize, grouplist));
+            if (!is_error(ret)) {
+                target_grouplist = lock_user(arg2, gidsetsize * 4, 0);
+                for(i = 0;i < gidsetsize; i++)
+                    target_grouplist[i] = tswap32(grouplist[i]);
+                unlock_user(target_grouplist, arg2, gidsetsize * 4);
+            }
+        }
+        break;
+#endif
+#ifdef TARGET_NR_setgroups32
     case TARGET_NR_setgroups32:
-        goto unimplemented;
+        {
+            int gidsetsize = arg1;
+            uint32_t *target_grouplist;
+            gid_t *grouplist;
+            int i;
+            
+            grouplist = alloca(gidsetsize * sizeof(gid_t));
+            target_grouplist = lock_user(arg2, gidsetsize * 4, 1);
+            for(i = 0;i < gidsetsize; i++)
+                grouplist[i] = tswap32(target_grouplist[i]);
+            unlock_user(target_grouplist, arg2, 0);
+            ret = get_errno(setgroups(gidsetsize, grouplist));
+        }
+        break;
+#endif
+#ifdef TARGET_NR_fchown32
     case TARGET_NR_fchown32:
         ret = get_errno(fchown(arg1, arg2, arg3));
         break;
+#endif
+#ifdef TARGET_NR_setresuid32
     case TARGET_NR_setresuid32:
         ret = get_errno(setresuid(arg1, arg2, arg3));
         break;
+#endif
+#ifdef TARGET_NR_getresuid32
     case TARGET_NR_getresuid32:
         {
-            int ruid, euid, suid;
+            uid_t ruid, euid, suid;
             ret = get_errno(getresuid(&ruid, &euid, &suid));
             if (!is_error(ret)) {
-                *(uint32_t *)arg1 = tswap32(ruid);
-                *(uint32_t *)arg2 = tswap32(euid);
-                *(uint32_t *)arg3 = tswap32(suid);
+                tput32(arg1, tswap32(ruid));
+                tput32(arg2, tswap32(euid));
+                tput32(arg3, tswap32(suid));
             }
         }
         break;
+#endif
+#ifdef TARGET_NR_setresgid32
     case TARGET_NR_setresgid32:
         ret = get_errno(setresgid(arg1, arg2, arg3));
         break;
+#endif
+#ifdef TARGET_NR_getresgid32
     case TARGET_NR_getresgid32:
         {
-            int rgid, egid, sgid;
+            gid_t rgid, egid, sgid;
             ret = get_errno(getresgid(&rgid, &egid, &sgid));
             if (!is_error(ret)) {
-                *(uint32_t *)arg1 = tswap32(rgid);
-                *(uint32_t *)arg2 = tswap32(egid);
-                *(uint32_t *)arg3 = tswap32(sgid);
+                tput32(arg1, tswap32(rgid));
+                tput32(arg2, tswap32(egid));
+                tput32(arg3, tswap32(sgid));
             }
         }
         break;
+#endif
+#ifdef TARGET_NR_chown32
     case TARGET_NR_chown32:
-        ret = get_errno(chown((const char *)arg1, arg2, arg3));
+        p = lock_user_string(arg1);
+        ret = get_errno(chown(p, arg2, arg3));
+        unlock_user(p, arg1, 0);
         break;
+#endif
+#ifdef TARGET_NR_setuid32
     case TARGET_NR_setuid32:
         ret = get_errno(setuid(arg1));
         break;
+#endif
+#ifdef TARGET_NR_setgid32
     case TARGET_NR_setgid32:
         ret = get_errno(setgid(arg1));
         break;
+#endif
+#ifdef TARGET_NR_setfsuid32
     case TARGET_NR_setfsuid32:
         ret = get_errno(setfsuid(arg1));
         break;
+#endif
+#ifdef TARGET_NR_setfsgid32
     case TARGET_NR_setfsgid32:
         ret = get_errno(setfsgid(arg1));
         break;
+#endif
 
     case TARGET_NR_pivot_root:
         goto unimplemented;
@@ -2954,33 +3862,71 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
 #endif
 #ifdef TARGET_NR_madvise
     case TARGET_NR_madvise:
-        goto unimplemented;
+        /* A straight passthrough may not be safe because qemu sometimes
+           turns private flie-backed mappings into anonymous mappings.
+           This will break MADV_DONTNEED.
+           This is a hint, so ignoring and returning success is ok.  */
+        ret = get_errno(0);
+        break;
 #endif
 #if TARGET_LONG_BITS == 32
     case TARGET_NR_fcntl64:
     {
        struct flock64 fl;
-       struct target_flock64 *target_fl = (void *)arg3;
+       struct target_flock64 *target_fl;
+#ifdef TARGET_ARM
+       struct target_eabi_flock64 *target_efl;
+#endif
 
         switch(arg2) {
         case F_GETLK64:
             ret = get_errno(fcntl(arg1, arg2, &fl));
            if (ret == 0) {
-               target_fl->l_type = tswap16(fl.l_type);
-               target_fl->l_whence = tswap16(fl.l_whence);
-               target_fl->l_start = tswap64(fl.l_start);
-               target_fl->l_len = tswap64(fl.l_len);
-               target_fl->l_pid = tswapl(fl.l_pid);
+#ifdef TARGET_ARM
+                if (((CPUARMState *)cpu_env)->eabi) {
+                    lock_user_struct(target_efl, arg3, 0);
+                    target_efl->l_type = tswap16(fl.l_type);
+                    target_efl->l_whence = tswap16(fl.l_whence);
+                    target_efl->l_start = tswap64(fl.l_start);
+                    target_efl->l_len = tswap64(fl.l_len);
+                    target_efl->l_pid = tswapl(fl.l_pid);
+                    unlock_user_struct(target_efl, arg3, 1);
+                } else
+#endif
+                {
+                    lock_user_struct(target_fl, arg3, 0);
+                    target_fl->l_type = tswap16(fl.l_type);
+                    target_fl->l_whence = tswap16(fl.l_whence);
+                    target_fl->l_start = tswap64(fl.l_start);
+                    target_fl->l_len = tswap64(fl.l_len);
+                    target_fl->l_pid = tswapl(fl.l_pid);
+                    unlock_user_struct(target_fl, arg3, 1);
+                }
            }
            break;
 
         case F_SETLK64:
         case F_SETLKW64:
-           fl.l_type = tswap16(target_fl->l_type);
-           fl.l_whence = tswap16(target_fl->l_whence);
-           fl.l_start = tswap64(target_fl->l_start);
-           fl.l_len = tswap64(target_fl->l_len);
-           fl.l_pid = tswapl(target_fl->l_pid);
+#ifdef TARGET_ARM
+            if (((CPUARMState *)cpu_env)->eabi) {
+                lock_user_struct(target_efl, arg3, 1);
+                fl.l_type = tswap16(target_efl->l_type);
+                fl.l_whence = tswap16(target_efl->l_whence);
+                fl.l_start = tswap64(target_efl->l_start);
+                fl.l_len = tswap64(target_efl->l_len);
+                fl.l_pid = tswapl(target_efl->l_pid);
+                unlock_user_struct(target_efl, arg3, 0);
+            } else
+#endif
+            {
+                lock_user_struct(target_fl, arg3, 1);
+                fl.l_type = tswap16(target_fl->l_type);
+                fl.l_whence = tswap16(target_fl->l_whence);
+                fl.l_start = tswap64(target_fl->l_start);
+                fl.l_len = tswap64(target_fl->l_len);
+                fl.l_pid = tswapl(target_fl->l_pid);
+                unlock_user_struct(target_fl, arg3, 0);
+            }
             ret = get_errno(fcntl(arg1, arg2, &fl));
            break;
         default:
@@ -2990,6 +3936,12 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
        break;
     }
 #endif
+#ifdef TARGET_NR_cacheflush
+    case TARGET_NR_cacheflush:
+        /* self-modifying code is handled automatically, so nothing needed */
+        ret = 0;
+        break;
+#endif
 #ifdef TARGET_NR_security
     case TARGET_NR_security:
         goto unimplemented;
@@ -3021,13 +3973,58 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
 #endif
 #ifdef TARGET_NR_set_thread_area
     case TARGET_NR_set_thread_area:
+#ifdef TARGET_MIPS
+      ((CPUMIPSState *) cpu_env)->tls_value = arg1;
+      ret = 0;
+      break;
+#else
+      goto unimplemented_nowarn;
+#endif
+#endif
+#ifdef TARGET_NR_get_thread_area
     case TARGET_NR_get_thread_area:
         goto unimplemented_nowarn;
 #endif
+#ifdef TARGET_NR_getdomainname
+    case TARGET_NR_getdomainname:
+        goto unimplemented_nowarn;
+#endif
+
+#ifdef TARGET_NR_clock_gettime
+    case TARGET_NR_clock_gettime:
+    {
+        struct timespec ts;
+        ret = get_errno(clock_gettime(arg1, &ts));
+        if (!is_error(ret)) {
+            host_to_target_timespec(arg2, &ts);
+        }
+        break;
+    }
+#endif
+#ifdef TARGET_NR_clock_getres
+    case TARGET_NR_clock_getres:
+    {
+        struct timespec ts;
+        ret = get_errno(clock_getres(arg1, &ts));
+        if (!is_error(ret)) {
+            host_to_target_timespec(arg2, &ts);
+        }
+        break;
+    }
+#endif
+
+#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
+    case TARGET_NR_set_tid_address:
+      ret = get_errno(set_tid_address((int *) arg1));
+      break;
+#endif
+
     default:
     unimplemented:
         gemu_log("qemu: Unsupported syscall: %d\n", num);
+#if defined(TARGET_NR_setxattr) || defined(TARGET_NR_get_thread_area) || defined(TARGET_NR_getdomainname)
     unimplemented_nowarn:
+#endif
         ret = -ENOSYS;
         break;
     }