vcs.maemo.org Git - qemu/blob - dyngen.c

   1 /*
   2  *  Generic Dynamic compiler generator
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <stdarg.h>
  24 #include <inttypes.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27
  28 #include "config-host.h"
  29
  30 /* elf format definitions. We use these macros to test the CPU to
  31    allow cross compilation (this tool must be ran on the build
  32    platform) */
  33 #if defined(HOST_I386)
  34
  35 #define ELF_CLASS       ELFCLASS32
  36 #define ELF_ARCH        EM_386
  37 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
  38 #undef ELF_USES_RELOCA
  39
  40 #elif defined(HOST_AMD64)
  41
  42 #define ELF_CLASS       ELFCLASS64
  43 #define ELF_ARCH        EM_X86_64
  44 #define elf_check_arch(x) ((x) == EM_X86_64)
  45 #define ELF_USES_RELOCA
  46
  47 #elif defined(HOST_PPC)
  48
  49 #define ELF_CLASS       ELFCLASS32
  50 #define ELF_ARCH        EM_PPC
  51 #define elf_check_arch(x) ((x) == EM_PPC)
  52 #define ELF_USES_RELOCA
  53
  54 #elif defined(HOST_S390)
  55
  56 #define ELF_CLASS       ELFCLASS32
  57 #define ELF_ARCH        EM_S390
  58 #define elf_check_arch(x) ((x) == EM_S390)
  59 #define ELF_USES_RELOCA
  60
  61 #elif defined(HOST_ALPHA)
  62
  63 #define ELF_CLASS       ELFCLASS64
  64 #define ELF_ARCH        EM_ALPHA
  65 #define elf_check_arch(x) ((x) == EM_ALPHA)
  66 #define ELF_USES_RELOCA
  67
  68 #elif defined(HOST_IA64)
  69
  70 #define ELF_CLASS       ELFCLASS64
  71 #define ELF_ARCH        EM_IA_64
  72 #define elf_check_arch(x) ((x) == EM_IA_64)
  73 #define ELF_USES_RELOCA
  74
  75 #elif defined(HOST_SPARC)
  76
  77 #define ELF_CLASS       ELFCLASS32
  78 #define ELF_ARCH        EM_SPARC
  79 #define elf_check_arch(x) ((x) == EM_SPARC || (x) == EM_SPARC32PLUS)
  80 #define ELF_USES_RELOCA
  81
  82 #elif defined(HOST_SPARC64)
  83
  84 #define ELF_CLASS       ELFCLASS64
  85 #define ELF_ARCH        EM_SPARCV9
  86 #define elf_check_arch(x) ((x) == EM_SPARCV9)
  87 #define ELF_USES_RELOCA
  88
  89 #elif defined(HOST_ARM)
  90
  91 #define ELF_CLASS       ELFCLASS32
  92 #define ELF_ARCH        EM_ARM
  93 #define elf_check_arch(x) ((x) == EM_ARM)
  94 #define ELF_USES_RELOC
  95
  96 #elif defined(HOST_M68K)
  97
  98 #define ELF_CLASS       ELFCLASS32
  99 #define ELF_ARCH        EM_68K
 100 #define elf_check_arch(x) ((x) == EM_68K)
 101 #define ELF_USES_RELOCA
 102
 103 #else
 104 #error unsupported CPU - please update the code
 105 #endif
 106
 107 #include "elf.h"
 108
 109 #if ELF_CLASS == ELFCLASS32
 110 typedef int32_t host_long;
 111 typedef uint32_t host_ulong;
 112 #define swabls(x) swab32s(x)
 113 #else
 114 typedef int64_t host_long;
 115 typedef uint64_t host_ulong;
 116 #define swabls(x) swab64s(x)
 117 #endif
 118
 119 #ifdef ELF_USES_RELOCA
 120 #define SHT_RELOC SHT_RELA
 121 #else
 122 #define SHT_RELOC SHT_REL
 123 #endif
 124
 125 #include "bswap.h"
 126
 127 enum {
 128     OUT_GEN_OP,
 129     OUT_CODE,
 130     OUT_INDEX_OP,
 131 };
 132
 133 /* all dynamically generated functions begin with this code */
 134 #define OP_PREFIX "op_"
 135
 136 int elf_must_swap(struct elfhdr *h)
 137 {
 138   union {
 139       uint32_t i;
 140       uint8_t b[4];
 141   } swaptest;
 142
 143   swaptest.i = 1;
 144   return (h->e_ident[EI_DATA] == ELFDATA2MSB) !=
 145       (swaptest.b[0] == 0);
 146 }
 147
 148 void swab16s(uint16_t *p)
 149 {
 150     *p = bswap16(*p);
 151 }
 152
 153 void swab32s(uint32_t *p)
 154 {
 155     *p = bswap32(*p);
 156 }
 157
 158 void swab64s(uint64_t *p)
 159 {
 160     *p = bswap64(*p);
 161 }
 162
 163 void elf_swap_ehdr(struct elfhdr *h)
 164 {
 165     swab16s(&h->e_type);                        /* Object file type */
 166     swab16s(&h->        e_machine);             /* Architecture */
 167     swab32s(&h->        e_version);             /* Object file version */
 168     swabls(&h-> e_entry);               /* Entry point virtual address */
 169     swabls(&h-> e_phoff);               /* Program header table file offset */
 170     swabls(&h-> e_shoff);               /* Section header table file offset */
 171     swab32s(&h->        e_flags);               /* Processor-specific flags */
 172     swab16s(&h->        e_ehsize);              /* ELF header size in bytes */
 173     swab16s(&h->        e_phentsize);           /* Program header table entry size */
 174     swab16s(&h->        e_phnum);               /* Program header table entry count */
 175     swab16s(&h->        e_shentsize);           /* Section header table entry size */
 176     swab16s(&h->        e_shnum);               /* Section header table entry count */
 177     swab16s(&h->        e_shstrndx);            /* Section header string table index */
 178 }
 179
 180 void elf_swap_shdr(struct elf_shdr *h)
 181 {
 182   swab32s(&h->  sh_name);               /* Section name (string tbl index) */
 183   swab32s(&h->  sh_type);               /* Section type */
 184   swabls(&h->   sh_flags);              /* Section flags */
 185   swabls(&h->   sh_addr);               /* Section virtual addr at execution */
 186   swabls(&h->   sh_offset);             /* Section file offset */
 187   swabls(&h->   sh_size);               /* Section size in bytes */
 188   swab32s(&h->  sh_link);               /* Link to another section */
 189   swab32s(&h->  sh_info);               /* Additional section information */
 190   swabls(&h->   sh_addralign);          /* Section alignment */
 191   swabls(&h->   sh_entsize);            /* Entry size if section holds table */
 192 }
 193
 194 void elf_swap_phdr(struct elf_phdr *h)
 195 {
 196     swab32s(&h->p_type);                        /* Segment type */
 197     swabls(&h->p_offset);               /* Segment file offset */
 198     swabls(&h->p_vaddr);                /* Segment virtual address */
 199     swabls(&h->p_paddr);                /* Segment physical address */
 200     swabls(&h->p_filesz);               /* Segment size in file */
 201     swabls(&h->p_memsz);                /* Segment size in memory */
 202     swab32s(&h->p_flags);               /* Segment flags */
 203     swabls(&h->p_align);                /* Segment alignment */
 204 }
 205
 206 void elf_swap_rel(ELF_RELOC *rel)
 207 {
 208     swabls(&rel->r_offset);
 209     swabls(&rel->r_info);
 210 #ifdef ELF_USES_RELOCA
 211     swabls(&rel->r_addend);
 212 #endif
 213 }
 214
 215 /* ELF file info */
 216 int do_swap;
 217 struct elf_shdr *shdr;
 218 uint8_t **sdata;
 219 struct elfhdr ehdr;
 220 ElfW(Sym) *symtab;
 221 int nb_syms;
 222 char *strtab;
 223 int text_shndx;
 224
 225 uint16_t get16(uint16_t *p)
 226 {
 227     uint16_t val;
 228     val = *p;
 229     if (do_swap)
 230         val = bswap16(val);
 231     return val;
 232 }
 233
 234 uint32_t get32(uint32_t *p)
 235 {
 236     uint32_t val;
 237     val = *p;
 238     if (do_swap)
 239         val = bswap32(val);
 240     return val;
 241 }
 242
 243 void put16(uint16_t *p, uint16_t val)
 244 {
 245     if (do_swap)
 246         val = bswap16(val);
 247     *p = val;
 248 }
 249
 250 void put32(uint32_t *p, uint32_t val)
 251 {
 252     if (do_swap)
 253         val = bswap32(val);
 254     *p = val;
 255 }
 256
 257 void __attribute__((noreturn)) __attribute__((format (printf, 1, 2))) error(const char *fmt, ...)
 258 {
 259     va_list ap;
 260     va_start(ap, fmt);
 261     fprintf(stderr, "dyngen: ");
 262     vfprintf(stderr, fmt, ap);
 263     fprintf(stderr, "\n");
 264     va_end(ap);
 265     exit(1);
 266 }
 267
 268
 269 struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr,
 270                                   const char *name)
 271 {
 272     int i;
 273     const char *shname;
 274     struct elf_shdr *sec;
 275
 276     for(i = 0; i < shnum; i++) {
 277         sec = &shdr[i];
 278         if (!sec->sh_name)
 279             continue;
 280         shname = shstr + sec->sh_name;
 281         if (!strcmp(shname, name))
 282             return sec;
 283     }
 284     return NULL;
 285 }
 286
 287 int find_reloc(int sh_index)
 288 {
 289     struct elf_shdr *sec;
 290     int i;
 291
 292     for(i = 0; i < ehdr.e_shnum; i++) {
 293         sec = &shdr[i];
 294         if (sec->sh_type == SHT_RELOC && sec->sh_info == sh_index)
 295             return i;
 296     }
 297     return 0;
 298 }
 299
 300 void *load_data(int fd, long offset, unsigned int size)
 301 {
 302     char *data;
 303
 304     data = malloc(size);
 305     if (!data)
 306         return NULL;
 307     lseek(fd, offset, SEEK_SET);
 308     if (read(fd, data, size) != size) {
 309         free(data);
 310         return NULL;
 311     }
 312     return data;
 313 }
 314
 315 int strstart(const char *str, const char *val, const char **ptr)
 316 {
 317     const char *p, *q;
 318     p = str;
 319     q = val;
 320     while (*q != '\0') {
 321         if (*p != *q)
 322             return 0;
 323         p++;
 324         q++;
 325     }
 326     if (ptr)
 327         *ptr = p;
 328     return 1;
 329 }
 330
 331 #ifdef HOST_ARM
 332
 333 int arm_emit_ldr_info(const char *name, unsigned long start_offset,
 334                       FILE *outfile, uint8_t *p_start, uint8_t *p_end,
 335                       ELF_RELOC *relocs, int nb_relocs)
 336 {
 337     uint8_t *p;
 338     uint32_t insn;
 339     int offset, min_offset, pc_offset, data_size;
 340     uint8_t data_allocated[1024];
 341     unsigned int data_index;
 342
 343     memset(data_allocated, 0, sizeof(data_allocated));
 344
 345     p = p_start;
 346     min_offset = p_end - p_start;
 347     while (p < p_start + min_offset) {
 348         insn = get32((uint32_t *)p);
 349         if ((insn & 0x0d5f0000) == 0x051f0000) {
 350             /* ldr reg, [pc, #im] */
 351             offset = insn & 0xfff;
 352             if (!(insn & 0x00800000))
 353                         offset = -offset;
 354             if ((offset & 3) !=0)
 355                 error("%s:%04x: ldr pc offset must be 32 bit aligned",
 356                       name, start_offset + p - p_start);
 357             pc_offset = p - p_start + offset + 8;
 358             if (pc_offset <= (p - p_start) ||
 359                 pc_offset >= (p_end - p_start))
 360                 error("%s:%04x: ldr pc offset must point inside the function code",
 361                       name, start_offset + p - p_start);
 362             if (pc_offset < min_offset)
 363                 min_offset = pc_offset;
 364             if (outfile) {
 365                 /* ldr position */
 366                 fprintf(outfile, "    arm_ldr_ptr->ptr = gen_code_ptr + %d;\n",
 367                         p - p_start);
 368                 /* ldr data index */
 369                 data_index = ((p_end - p_start) - pc_offset - 4) >> 2;
 370                 fprintf(outfile, "    arm_ldr_ptr->data_ptr = arm_data_ptr + %d;\n",
 371                         data_index);
 372                 fprintf(outfile, "    arm_ldr_ptr++;\n");
 373                 if (data_index >= sizeof(data_allocated))
 374                     error("%s: too many data", name);
 375                 if (!data_allocated[data_index]) {
 376                     ELF_RELOC *rel;
 377                     int i, addend, type;
 378                     const char *sym_name, *p;
 379                     char relname[1024];
 380
 381                     data_allocated[data_index] = 1;
 382
 383                     /* data value */
 384                     addend = get32((uint32_t *)(p_start + pc_offset));
 385                     relname[0] = '\0';
 386                     for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 387                         if (rel->r_offset == (pc_offset + start_offset)) {
 388                             sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 389                             /* the compiler leave some unnecessary references to the code */
 390                             if (strstart(sym_name, "__op_param", &p)) {
 391                                 snprintf(relname, sizeof(relname), "param%s", p);
 392                             } else {
 393                                 snprintf(relname, sizeof(relname), "(long)(&%s)", sym_name);
 394                             }
 395                             type = ELF32_R_TYPE(rel->r_info);
 396                             if (type != R_ARM_ABS32)
 397                                 error("%s: unsupported data relocation", name);
 398                             break;
 399                         }
 400                     }
 401                     fprintf(outfile, "    arm_data_ptr[%d] = 0x%x",
 402                             data_index, addend);
 403                     if (relname[0] != '\0')
 404                         fprintf(outfile, " + %s", relname);
 405                     fprintf(outfile, ";\n");
 406                 }
 407             }
 408         }
 409         p += 4;
 410     }
 411     data_size = (p_end - p_start) - min_offset;
 412     if (data_size > 0 && outfile) {
 413         fprintf(outfile, "    arm_data_ptr += %d;\n", data_size >> 2);
 414     }
 415
 416     /* the last instruction must be a mov pc, lr */
 417     if (p == p_start)
 418         goto arm_ret_error;
 419     p -= 4;
 420     insn = get32((uint32_t *)p);
 421     if ((insn & 0xffff0000) != 0xe91b0000) {
 422     arm_ret_error:
 423         if (!outfile)
 424             printf("%s: invalid epilog\n", name);
 425     }
 426     return p - p_start;
 427 }
 428 #endif
 429
 430
 431 #define MAX_ARGS 3
 432
 433 /* generate op code */
 434 void gen_code(const char *name, host_ulong offset, host_ulong size,
 435               FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs,
 436               int gen_switch)
 437 {
 438     int copy_size = 0;
 439     uint8_t *p_start, *p_end;
 440     host_ulong start_offset;
 441     int nb_args, i, n;
 442     uint8_t args_present[MAX_ARGS];
 443     const char *sym_name, *p;
 444     ELF_RELOC *rel;
 445
 446     /* Compute exact size excluding prologue and epilogue instructions.
 447      * Increment start_offset to skip epilogue instructions, then compute
 448      * copy_size the indicate the size of the remaining instructions (in
 449      * bytes).
 450      */
 451     p_start = text + offset;
 452     p_end = p_start + size;
 453     start_offset = offset;
 454     switch(ELF_ARCH) {
 455     case EM_386:
 456     case EM_X86_64:
 457         {
 458             int len;
 459             len = p_end - p_start;
 460             if (len == 0)
 461                 error("empty code for %s", name);
 462             if (p_end[-1] == 0xc3) {
 463                 len--;
 464             } else {
 465                 error("ret or jmp expected at the end of %s", name);
 466             }
 467             copy_size = len;
 468         }
 469         break;
 470     case EM_PPC:
 471         {
 472             uint8_t *p;
 473             p = (void *)(p_end - 4);
 474             if (p == p_start)
 475                 error("empty code for %s", name);
 476             if (get32((uint32_t *)p) != 0x4e800020)
 477                 error("blr expected at the end of %s", name);
 478             copy_size = p - p_start;
 479         }
 480         break;
 481     case EM_S390:
 482         {
 483             uint8_t *p;
 484             p = (void *)(p_end - 2);
 485             if (p == p_start)
 486                 error("empty code for %s", name);
 487             if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4)
 488                 error("br %%r14 expected at the end of %s", name);
 489             copy_size = p - p_start;
 490         }
 491         break;
 492     case EM_ALPHA:
 493         {
 494             uint8_t *p;
 495             p = p_end - 4;
 496 #if 0
 497             /* XXX: check why it occurs */
 498             if (p == p_start)
 499                 error("empty code for %s", name);
 500 #endif
 501             if (get32((uint32_t *)p) != 0x6bfa8001)
 502                 error("ret expected at the end of %s", name);
 503             copy_size = p - p_start;
 504         }
 505         break;
 506     case EM_IA_64:
 507         {
 508             uint8_t *p;
 509             p = (void *)(p_end - 4);
 510             if (p == p_start)
 511                 error("empty code for %s", name);
 512             /* br.ret.sptk.many b0;; */
 513             /* 08 00 84 00 */
 514             if (get32((uint32_t *)p) != 0x00840008)
 515                 error("br.ret.sptk.many b0;; expected at the end of %s", name);
 516             copy_size = p - p_start;
 517         }
 518         break;
 519     case EM_SPARC:
 520     case EM_SPARC32PLUS:
 521         {
 522             uint32_t start_insn, end_insn1, end_insn2;
 523             uint8_t *p;
 524             p = (void *)(p_end - 8);
 525             if (p <= p_start)
 526                 error("empty code for %s", name);
 527             start_insn = get32((uint32_t *)(p_start + 0x0));
 528             end_insn1 = get32((uint32_t *)(p + 0x0));
 529             end_insn2 = get32((uint32_t *)(p + 0x4));
 530             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 531                 p_start += 0x4;
 532                 start_offset += 0x4;
 533                 if ((int)(start_insn | ~0x1fff) < -128)
 534                     error("Found bogus save at the start of %s", name);
 535                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 536                     error("ret; restore; not found at end of %s", name);
 537             } else {
 538                 error("No save at the beginning of %s", name);
 539             }
 540 #if 0
 541             /* Skip a preceeding nop, if present.  */
 542             if (p > p_start) {
 543                 skip_insn = get32((uint32_t *)(p - 0x4));
 544                 if (skip_insn == 0x01000000)
 545                     p -= 4;
 546             }
 547 #endif
 548             copy_size = p - p_start;
 549         }
 550         break;
 551     case EM_SPARCV9:
 552         {
 553             uint32_t start_insn, end_insn1, end_insn2, skip_insn;
 554             uint8_t *p;
 555             p = (void *)(p_end - 8);
 556             if (p <= p_start)
 557                 error("empty code for %s", name);
 558             start_insn = get32((uint32_t *)(p_start + 0x0));
 559             end_insn1 = get32((uint32_t *)(p + 0x0));
 560             end_insn2 = get32((uint32_t *)(p + 0x4));
 561             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 562                 p_start += 0x4;
 563                 start_offset += 0x4;
 564                 if ((int)(start_insn | ~0x1fff) < -256)
 565                     error("Found bogus save at the start of %s", name);
 566                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 567                     error("ret; restore; not found at end of %s", name);
 568             } else {
 569                 error("No save at the beginning of %s", name);
 570             }
 571
 572             /* Skip a preceeding nop, if present.  */
 573             if (p > p_start) {
 574                 skip_insn = get32((uint32_t *)(p - 0x4));
 575                 if (skip_insn == 0x01000000)
 576                     p -= 4;
 577             }
 578
 579             copy_size = p - p_start;
 580         }
 581         break;
 582 #ifdef HOST_ARM
 583     case EM_ARM:
 584         if ((p_end - p_start) <= 16)
 585             error("%s: function too small", name);
 586         if (get32((uint32_t *)p_start) != 0xe1a0c00d ||
 587             (get32((uint32_t *)(p_start + 4)) & 0xffff0000) != 0xe92d0000 ||
 588             get32((uint32_t *)(p_start + 8)) != 0xe24cb004)
 589             error("%s: invalid prolog", name);
 590         p_start += 12;
 591         start_offset += 12;
 592         copy_size = arm_emit_ldr_info(name, start_offset, NULL, p_start, p_end,
 593                                       relocs, nb_relocs);
 594         break;
 595 #endif
 596     case EM_68K:
 597         {
 598             uint8_t *p;
 599             p = (void *)(p_end - 2);
 600             if (p == p_start)
 601                 error("empty code for %s", name);
 602             // remove NOP's, probably added for alignment
 603             while ((get16((uint16_t *)p) == 0x4e71) &&
 604                    (p>p_start))
 605               p -= 2;
 606             if (get16((uint16_t *)p) != 0x4e75)
 607                 error("rts expected at the end of %s", name);
 608             copy_size = p - p_start;
 609         }
 610         break;
 611     default:
 612         error("unknown ELF architecture");
 613     }
 614
 615     /* compute the number of arguments by looking at the relocations */
 616     for(i = 0;i < MAX_ARGS; i++)
 617         args_present[i] = 0;
 618
 619     for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 620         if (rel->r_offset >= start_offset &&
 621             rel->r_offset < start_offset + (p_end - p_start)) {
 622             sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 623             if (strstart(sym_name, "__op_param", &p)) {
 624                 n = strtoul(p, NULL, 10);
 625                 if (n > MAX_ARGS)
 626                     error("too many arguments in %s", name);
 627                 args_present[n - 1] = 1;
 628             }
 629         }
 630     }
 631
 632     nb_args = 0;
 633     while (nb_args < MAX_ARGS && args_present[nb_args])
 634         nb_args++;
 635     for(i = nb_args; i < MAX_ARGS; i++) {
 636         if (args_present[i])
 637             error("inconsistent argument numbering in %s", name);
 638     }
 639
 640     if (gen_switch == 2) {
 641         fprintf(outfile, "DEF(%s, %d, %d)\n", name + 3, nb_args, copy_size);
 642     } else if (gen_switch == 1) {
 643
 644         /* output C code */
 645         fprintf(outfile, "case INDEX_%s: {\n", name);
 646         if (nb_args > 0) {
 647             fprintf(outfile, "    long ");
 648             for(i = 0; i < nb_args; i++) {
 649                 if (i != 0)
 650                     fprintf(outfile, ", ");
 651                 fprintf(outfile, "param%d", i + 1);
 652             }
 653             fprintf(outfile, ";\n");
 654         }
 655         fprintf(outfile, "    extern void %s();\n", name);
 656
 657         for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 658             if (rel->r_offset >= start_offset &&
 659                 rel->r_offset < start_offset + (p_end - p_start)) {
 660                 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 661                 if (*sym_name &&
 662                     !strstart(sym_name, "__op_param", NULL) &&
 663                     !strstart(sym_name, "__op_jmp", NULL)) {
 664 #if defined(HOST_SPARC)
 665                     if (sym_name[0] == '.') {
 666                         fprintf(outfile,
 667                                 "extern char __dot_%s __asm__(\"%s\");\n",
 668                                 sym_name+1, sym_name);
 669                         continue;
 670                     }
 671 #endif
 672                     fprintf(outfile, "extern char %s;\n", sym_name);
 673                 }
 674             }
 675         }
 676
 677         fprintf(outfile, "    memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name, start_offset - offset, copy_size);
 678
 679         /* emit code offset information */
 680         {
 681             ElfW(Sym) *sym;
 682             const char *sym_name, *p;
 683             unsigned long val;
 684             int n;
 685
 686             for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
 687                 sym_name = strtab + sym->st_name;
 688                 if (strstart(sym_name, "__op_label", &p)) {
 689                     uint8_t *ptr;
 690                     unsigned long offset;
 691
 692                     /* test if the variable refers to a label inside
 693                        the code we are generating */
 694                     ptr = sdata[sym->st_shndx];
 695                     if (!ptr)
 696                         error("__op_labelN in invalid section");
 697                     offset = sym->st_value;
 698                     val = *(unsigned long *)(ptr + offset);
 699 #ifdef ELF_USES_RELOCA
 700                     {
 701                         int reloc_shndx, nb_relocs1, j;
 702
 703                         /* try to find a matching relocation */
 704                         reloc_shndx = find_reloc(sym->st_shndx);
 705                         if (reloc_shndx) {
 706                             nb_relocs1 = shdr[reloc_shndx].sh_size /
 707                                 shdr[reloc_shndx].sh_entsize;
 708                             rel = (ELF_RELOC *)sdata[reloc_shndx];
 709                             for(j = 0; j < nb_relocs1; j++) {
 710                                 if (rel->r_offset == offset) {
 711                                     val = rel->r_addend;
 712                                     break;
 713                                 }
 714                                 rel++;
 715                             }
 716                         }
 717                     }
 718 #endif
 719
 720                     if (val >= start_offset && val < start_offset + copy_size) {
 721                         n = strtol(p, NULL, 10);
 722                         fprintf(outfile, "    label_offsets[%d] = %ld + (gen_code_ptr - gen_code_buf);\n", n, val - start_offset);
 723                     }
 724                 }
 725             }
 726         }
 727
 728         /* load parameres in variables */
 729         for(i = 0; i < nb_args; i++) {
 730             fprintf(outfile, "    param%d = *opparam_ptr++;\n", i + 1);
 731         }
 732
 733         /* patch relocations */
 734 #if defined(HOST_I386)
 735             {
 736                 char name[256];
 737                 int type;
 738                 int addend;
 739                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 740                 if (rel->r_offset >= start_offset &&
 741                     rel->r_offset < start_offset + copy_size) {
 742                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 743                     if (strstart(sym_name, "__op_jmp", &p)) {
 744                         int n;
 745                         n = strtol(p, NULL, 10);
 746                         /* __op_jmp relocations are done at
 747                            runtime to do translated block
 748                            chaining: the offset of the instruction
 749                            needs to be stored */
 750                         fprintf(outfile, "    jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
 751                                 n, rel->r_offset - start_offset);
 752                         continue;
 753                     }
 754
 755                     if (strstart(sym_name, "__op_param", &p)) {
 756                         snprintf(name, sizeof(name), "param%s", p);
 757                     } else {
 758                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 759                     }
 760                     type = ELF32_R_TYPE(rel->r_info);
 761                     addend = get32((uint32_t *)(text + rel->r_offset));
 762                     switch(type) {
 763                     case R_386_32:
 764                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 765                                 rel->r_offset - start_offset, name, addend);
 766                         break;
 767                     case R_386_PC32:
 768                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
 769                                 rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 770                         break;
 771                     default:
 772                         error("unsupported i386 relocation (%d)", type);
 773                     }
 774                 }
 775                 }
 776             }
 777 #elif defined(HOST_AMD64)
 778             {
 779                 char name[256];
 780                 int type;
 781                 int addend;
 782                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 783                 if (rel->r_offset >= start_offset &&
 784                     rel->r_offset < start_offset + copy_size) {
 785                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 786                     if (strstart(sym_name, "__op_param", &p)) {
 787                         snprintf(name, sizeof(name), "param%s", p);
 788                     } else {
 789                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 790                     }
 791                     type = ELF32_R_TYPE(rel->r_info);
 792                     addend = rel->r_addend;
 793                     switch(type) {
 794                     case R_X86_64_32:
 795                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = (uint32_t)%s + %d;\n",
 796                                 rel->r_offset - start_offset, name, addend);
 797                         break;
 798                     case R_X86_64_32S:
 799                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = (int32_t)%s + %d;\n",
 800                                 rel->r_offset - start_offset, name, addend);
 801                         break;
 802                     case R_X86_64_PC32:
 803                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
 804                                 rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 805                         break;
 806                     default:
 807                         error("unsupported AMD64 relocation (%d)", type);
 808                     }
 809                 }
 810                 }
 811             }
 812 #elif defined(HOST_PPC)
 813             {
 814                 char name[256];
 815                 int type;
 816                 int addend;
 817                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 818                     if (rel->r_offset >= start_offset &&
 819                         rel->r_offset < start_offset + copy_size) {
 820                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 821                         if (strstart(sym_name, "__op_jmp", &p)) {
 822                             int n;
 823                             n = strtol(p, NULL, 10);
 824                             /* __op_jmp relocations are done at
 825                                runtime to do translated block
 826                                chaining: the offset of the instruction
 827                                needs to be stored */
 828                             fprintf(outfile, "    jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
 829                                     n, rel->r_offset - start_offset);
 830                             continue;
 831                         }
 832
 833                         if (strstart(sym_name, "__op_param", &p)) {
 834                             snprintf(name, sizeof(name), "param%s", p);
 835                         } else {
 836                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 837                         }
 838                         type = ELF32_R_TYPE(rel->r_info);
 839                         addend = rel->r_addend;
 840                         switch(type) {
 841                         case R_PPC_ADDR32:
 842                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 843                                     rel->r_offset - start_offset, name, addend);
 844                             break;
 845                         case R_PPC_ADDR16_LO:
 846                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
 847                                     rel->r_offset - start_offset, name, addend);
 848                             break;
 849                         case R_PPC_ADDR16_HI:
 850                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
 851                                     rel->r_offset - start_offset, name, addend);
 852                             break;
 853                         case R_PPC_ADDR16_HA:
 854                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
 855                                     rel->r_offset - start_offset, name, addend);
 856                             break;
 857                         case R_PPC_REL24:
 858                             /* warning: must be at 32 MB distancy */
 859                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
 860                                     rel->r_offset - start_offset, rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 861                             break;
 862                         default:
 863                             error("unsupported powerpc relocation (%d)", type);
 864                         }
 865                     }
 866                 }
 867             }
 868 #elif defined(HOST_S390)
 869             {
 870                 char name[256];
 871                 int type;
 872                 int addend;
 873                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 874                     if (rel->r_offset >= start_offset &&
 875                         rel->r_offset < start_offset + copy_size) {
 876                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 877                         if (strstart(sym_name, "__op_param", &p)) {
 878                             snprintf(name, sizeof(name), "param%s", p);
 879                         } else {
 880                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 881                         }
 882                         type = ELF32_R_TYPE(rel->r_info);
 883                         addend = rel->r_addend;
 884                         switch(type) {
 885                         case R_390_32:
 886                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 887                                     rel->r_offset - start_offset, name, addend);
 888                             break;
 889                         case R_390_16:
 890                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
 891                                     rel->r_offset - start_offset, name, addend);
 892                             break;
 893                         case R_390_8:
 894                             fprintf(outfile, "    *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
 895                                     rel->r_offset - start_offset, name, addend);
 896                             break;
 897                         default:
 898                             error("unsupported s390 relocation (%d)", type);
 899                         }
 900                     }
 901                 }
 902             }
 903 #elif defined(HOST_ALPHA)
 904             {
 905                 for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) {
 906                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 907                         int type;
 908
 909                         type = ELF64_R_TYPE(rel->r_info);
 910                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 911                         switch (type) {
 912                         case R_ALPHA_GPDISP:
 913                             /* The gp is just 32 bit, and never changes, so it's easiest to emit it
 914                                as an immediate instead of constructing it from the pv or ra.  */
 915                             fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, gp);\n",
 916                                     rel->r_offset - start_offset);
 917                             fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, gp);\n",
 918                                     rel->r_offset - start_offset + rel->r_addend);
 919                             break;
 920                         case R_ALPHA_LITUSE:
 921                             /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
 922                                now, since some called functions (libc) need pv to be set up.  */
 923                             break;
 924                         case R_ALPHA_HINT:
 925                             /* Branch target prediction hint. Ignore for now.  Should be already
 926                                correct for in-function jumps.  */
 927                             break;
 928                         case R_ALPHA_LITERAL:
 929                             /* Load a literal from the GOT relative to the gp.  Since there's only a
 930                                single gp, nothing is to be done.  */
 931                             break;
 932                         case R_ALPHA_GPRELHIGH:
 933                             /* Handle fake relocations against __op_param symbol.  Need to emit the
 934                                high part of the immediate value instead.  Other symbols need no
 935                                special treatment.  */
 936                             if (strstart(sym_name, "__op_param", &p))
 937                                 fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, param%s);\n",
 938                                         rel->r_offset - start_offset, p);
 939                             break;
 940                         case R_ALPHA_GPRELLOW:
 941                             if (strstart(sym_name, "__op_param", &p))
 942                                 fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, param%s);\n",
 943                                         rel->r_offset - start_offset, p);
 944                             break;
 945                         case R_ALPHA_BRSGP:
 946                             /* PC-relative jump. Tweak offset to skip the two instructions that try to
 947                                set up the gp from the pv.  */
 948                             fprintf(outfile, "    fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
 949                                     rel->r_offset - start_offset, sym_name, rel->r_offset - start_offset);
 950                             break;
 951                         default:
 952                             error("unsupported Alpha relocation (%d)", type);
 953                         }
 954                     }
 955                 }
 956             }
 957 #elif defined(HOST_IA64)
 958             {
 959                 char name[256];
 960                 int type;
 961                 int addend;
 962                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 963                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 964                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 965                         if (strstart(sym_name, "__op_param", &p)) {
 966                             snprintf(name, sizeof(name), "param%s", p);
 967                         } else {
 968                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 969                         }
 970                         type = ELF64_R_TYPE(rel->r_info);
 971                         addend = rel->r_addend;
 972                         switch(type) {
 973                         case R_IA64_LTOFF22:
 974                             error("must implemnt R_IA64_LTOFF22 relocation");
 975                         case R_IA64_PCREL21B:
 976                             error("must implemnt R_IA64_PCREL21B relocation");
 977                         default:
 978                             error("unsupported ia64 relocation (%d)", type);
 979                         }
 980                     }
 981                 }
 982             }
 983 #elif defined(HOST_SPARC)
 984             {
 985                 char name[256];
 986                 int type;
 987                 int addend;
 988                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 989                     if (rel->r_offset >= start_offset &&
 990                         rel->r_offset < start_offset + copy_size) {
 991                         sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 992                         if (strstart(sym_name, "__op_param", &p)) {
 993                             snprintf(name, sizeof(name), "param%s", p);
 994                         } else {
 995                                 if (sym_name[0] == '.')
 996                                         snprintf(name, sizeof(name),
 997                                                  "(long)(&__dot_%s)",
 998                                                  sym_name + 1);
 999                                 else
1000                                         snprintf(name, sizeof(name),
1001                                                  "(long)(&%s)", sym_name);
1002                         }
1003                         type = ELF32_R_TYPE(rel->r_info);
1004                         addend = rel->r_addend;
1005                         switch(type) {
1006                         case R_SPARC_32:
1007                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1008                                     rel->r_offset - start_offset, name, addend);
1009                             break;
1010                         case R_SPARC_HI22:
1011                             fprintf(outfile,
1012                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1013                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1014                                     " & ~0x3fffff) "
1015                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
1016                                     rel->r_offset - start_offset,
1017                                     rel->r_offset - start_offset,
1018                                     name, addend);
1019                             break;
1020                         case R_SPARC_LO10:
1021                             fprintf(outfile,
1022                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1023                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1024                                     " & ~0x3ff) "
1025                                     " | ((%s + %d) & 0x3ff);\n",
1026                                     rel->r_offset - start_offset,
1027                                     rel->r_offset - start_offset,
1028                                     name, addend);
1029                             break;
1030                         case R_SPARC_WDISP30:
1031                             fprintf(outfile,
1032                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1033                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1034                                     " & ~0x3fffffff) "
1035                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
1036                                     "    & 0x3fffffff);\n",
1037                                     rel->r_offset - start_offset,
1038                                     rel->r_offset - start_offset,
1039                                     name, addend,
1040                                     rel->r_offset - start_offset);
1041                             break;
1042                         default:
1043                             error("unsupported sparc relocation (%d)", type);
1044                         }
1045                     }
1046                 }
1047             }
1048 #elif defined(HOST_SPARC64)
1049             {
1050                 char name[256];
1051                 int type;
1052                 int addend;
1053                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1054                     if (rel->r_offset >= start_offset &&
1055                         rel->r_offset < start_offset + copy_size) {
1056                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
1057                         if (strstart(sym_name, "__op_param", &p)) {
1058                             snprintf(name, sizeof(name), "param%s", p);
1059                         } else {
1060                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1061                         }
1062                         type = ELF64_R_TYPE(rel->r_info);
1063                         addend = rel->r_addend;
1064                         switch(type) {
1065                         case R_SPARC_32:
1066                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1067                                     rel->r_offset - start_offset, name, addend);
1068                             break;
1069                         case R_SPARC_HI22:
1070                             fprintf(outfile,
1071                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1072                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1073                                     " & ~0x3fffff) "
1074                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
1075                                     rel->r_offset - start_offset,
1076                                     rel->r_offset - start_offset,
1077                                     name, addend);
1078                             break;
1079                         case R_SPARC_LO10:
1080                             fprintf(outfile,
1081                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1082                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1083                                     " & ~0x3ff) "
1084                                     " | ((%s + %d) & 0x3ff);\n",
1085                                     rel->r_offset - start_offset,
1086                                     rel->r_offset - start_offset,
1087                                     name, addend);
1088                             break;
1089                         case R_SPARC_WDISP30:
1090                             fprintf(outfile,
1091                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1092                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1093                                     " & ~0x3fffffff) "
1094                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
1095                                     "    & 0x3fffffff);\n",
1096                                     rel->r_offset - start_offset,
1097                                     rel->r_offset - start_offset,
1098                                     name, addend,
1099                                     rel->r_offset - start_offset);
1100                             break;
1101                         default:
1102                             error("unsupported sparc64 relocation (%d)", type);
1103                         }
1104                     }
1105                 }
1106             }
1107 #elif defined(HOST_ARM)
1108             {
1109                 char name[256];
1110                 int type;
1111                 int addend;
1112
1113                 arm_emit_ldr_info(name, start_offset, outfile, p_start, p_end,
1114                                   relocs, nb_relocs);
1115
1116                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1117                 if (rel->r_offset >= start_offset &&
1118                     rel->r_offset < start_offset + copy_size) {
1119                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
1120                     /* the compiler leave some unnecessary references to the code */
1121                     if (sym_name[0] == '\0')
1122                         continue;
1123                     if (strstart(sym_name, "__op_param", &p)) {
1124                         snprintf(name, sizeof(name), "param%s", p);
1125                     } else {
1126                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1127                     }
1128                     type = ELF32_R_TYPE(rel->r_info);
1129                     addend = get32((uint32_t *)(text + rel->r_offset));
1130                     switch(type) {
1131                     case R_ARM_ABS32:
1132                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1133                                 rel->r_offset - start_offset, name, addend);
1134                         break;
1135                     case R_ARM_PC24:
1136                         fprintf(outfile, "    arm_reloc_pc24((uint32_t *)(gen_code_ptr + %d), 0x%x, %s);\n",
1137                                 rel->r_offset - start_offset, addend, name);
1138                         break;
1139                     default:
1140                         error("unsupported arm relocation (%d)", type);
1141                     }
1142                 }
1143                 }
1144             }
1145 #elif defined(HOST_M68K)
1146             {
1147                 char name[256];
1148                 int type;
1149                 int addend;
1150                 Elf32_Sym *sym;
1151                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1152                 if (rel->r_offset >= start_offset &&
1153                     rel->r_offset < start_offset + copy_size) {
1154                     sym = &(symtab[ELFW(R_SYM)(rel->r_info)]);
1155                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
1156                     if (strstart(sym_name, "__op_param", &p)) {
1157                         snprintf(name, sizeof(name), "param%s", p);
1158                     } else {
1159                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1160                     }
1161                     type = ELF32_R_TYPE(rel->r_info);
1162                     addend = get32((uint32_t *)(text + rel->r_offset)) + rel->r_addend;
1163                     switch(type) {
1164                     case R_68K_32:
1165                         fprintf(outfile, "    /* R_68K_32 RELOC, offset %x */\n", rel->r_offset) ;
1166                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %#x;\n",
1167                                 rel->r_offset - start_offset, name, addend );
1168                         break;
1169                     case R_68K_PC32:
1170                         fprintf(outfile, "    /* R_68K_PC32 RELOC, offset %x */\n", rel->r_offset);
1171                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %#x) + %#x;\n",
1172                                 rel->r_offset - start_offset, name, rel->r_offset - start_offset, /*sym->st_value+*/ addend);
1173                         break;
1174                     default:
1175                         error("unsupported m68k relocation (%d)", type);
1176                     }
1177                 }
1178                 }
1179             }
1180 #else
1181 #error unsupported CPU
1182 #endif
1183         fprintf(outfile, "    gen_code_ptr += %d;\n", copy_size);
1184         fprintf(outfile, "}\n");
1185         fprintf(outfile, "break;\n\n");
1186     } else {
1187         fprintf(outfile, "static inline void gen_%s(", name);
1188         if (nb_args == 0) {
1189             fprintf(outfile, "void");
1190         } else {
1191             for(i = 0; i < nb_args; i++) {
1192                 if (i != 0)
1193                     fprintf(outfile, ", ");
1194                 fprintf(outfile, "long param%d", i + 1);
1195             }
1196         }
1197         fprintf(outfile, ")\n");
1198         fprintf(outfile, "{\n");
1199         for(i = 0; i < nb_args; i++) {
1200             fprintf(outfile, "    *gen_opparam_ptr++ = param%d;\n", i + 1);
1201         }
1202         fprintf(outfile, "    *gen_opc_ptr++ = INDEX_%s;\n", name);
1203         fprintf(outfile, "}\n\n");
1204     }
1205 }
1206
1207 /* load an elf object file */
1208 int load_elf(const char *filename, FILE *outfile, int out_type)
1209 {
1210     int fd;
1211     struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec;
1212     int i, j;
1213     ElfW(Sym) *sym;
1214     char *shstr;
1215     uint8_t *text;
1216     ELF_RELOC *relocs;
1217     int nb_relocs;
1218     ELF_RELOC *rel;
1219
1220     fd = open(filename, O_RDONLY);
1221     if (fd < 0)
1222         error("can't open file '%s'", filename);
1223
1224     /* Read ELF header.  */
1225     if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
1226         error("unable to read file header");
1227
1228     /* Check ELF identification.  */
1229     if (ehdr.e_ident[EI_MAG0] != ELFMAG0
1230      || ehdr.e_ident[EI_MAG1] != ELFMAG1
1231      || ehdr.e_ident[EI_MAG2] != ELFMAG2
1232      || ehdr.e_ident[EI_MAG3] != ELFMAG3
1233      || ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
1234         error("bad ELF header");
1235     }
1236
1237     do_swap = elf_must_swap(&ehdr);
1238     if (do_swap)
1239         elf_swap_ehdr(&ehdr);
1240     if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
1241         error("Unsupported ELF class");
1242     if (ehdr.e_type != ET_REL)
1243         error("ELF object file expected");
1244     if (ehdr.e_version != EV_CURRENT)
1245         error("Invalid ELF version");
1246     if (!elf_check_arch(ehdr.e_machine))
1247         error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
1248
1249     /* read section headers */
1250     shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr));
1251     if (do_swap) {
1252         for(i = 0; i < ehdr.e_shnum; i++) {
1253             elf_swap_shdr(&shdr[i]);
1254         }
1255     }
1256
1257     /* read all section data */
1258     sdata = malloc(sizeof(void *) * ehdr.e_shnum);
1259     memset(sdata, 0, sizeof(void *) * ehdr.e_shnum);
1260
1261     for(i = 0;i < ehdr.e_shnum; i++) {
1262         sec = &shdr[i];
1263         if (sec->sh_type != SHT_NOBITS)
1264             sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size);
1265     }
1266
1267     sec = &shdr[ehdr.e_shstrndx];
1268     shstr = sdata[ehdr.e_shstrndx];
1269
1270     /* swap relocations */
1271     for(i = 0; i < ehdr.e_shnum; i++) {
1272         sec = &shdr[i];
1273         if (sec->sh_type == SHT_RELOC) {
1274             nb_relocs = sec->sh_size / sec->sh_entsize;
1275             if (do_swap) {
1276                 for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++)
1277                     elf_swap_rel(rel);
1278             }
1279         }
1280     }
1281     /* text section */
1282
1283     text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
1284     if (!text_sec)
1285         error("could not find .text section");
1286     text_shndx = text_sec - shdr;
1287     text = sdata[text_shndx];
1288
1289     /* find text relocations, if any */
1290     relocs = NULL;
1291     nb_relocs = 0;
1292     i = find_reloc(text_shndx);
1293     if (i != 0) {
1294         relocs = (ELF_RELOC *)sdata[i];
1295         nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize;
1296     }
1297
1298     symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
1299     if (!symtab_sec)
1300         error("could not find .symtab section");
1301     strtab_sec = &shdr[symtab_sec->sh_link];
1302
1303     symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr];
1304     strtab = sdata[symtab_sec->sh_link];
1305
1306     nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
1307     if (do_swap) {
1308         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1309             swab32s(&sym->st_name);
1310             swabls(&sym->st_value);
1311             swabls(&sym->st_size);
1312             swab16s(&sym->st_shndx);
1313         }
1314     }
1315
1316     if (out_type == OUT_INDEX_OP) {
1317         fprintf(outfile, "DEF(end, 0, 0)\n");
1318         fprintf(outfile, "DEF(nop, 0, 0)\n");
1319         fprintf(outfile, "DEF(nop1, 1, 0)\n");
1320         fprintf(outfile, "DEF(nop2, 2, 0)\n");
1321         fprintf(outfile, "DEF(nop3, 3, 0)\n");
1322         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1323             const char *name, *p;
1324             name = strtab + sym->st_name;
1325             if (strstart(name, OP_PREFIX, &p)) {
1326                 gen_code(name, sym->st_value, sym->st_size, outfile,
1327                          text, relocs, nb_relocs, 2);
1328             }
1329         }
1330     } else if (out_type == OUT_GEN_OP) {
1331         /* generate gen_xxx functions */
1332
1333         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1334             const char *name;
1335             name = strtab + sym->st_name;
1336             if (strstart(name, OP_PREFIX, NULL)) {
1337                 if (sym->st_shndx != (text_sec - shdr))
1338                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1339                 gen_code(name, sym->st_value, sym->st_size, outfile,
1340                          text, relocs, nb_relocs, 0);
1341             }
1342         }
1343
1344     } else {
1345         /* generate big code generation switch */
1346 fprintf(outfile,
1347 "int dyngen_code(uint8_t *gen_code_buf,\n"
1348 "                uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
1349 "                const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
1350 "{\n"
1351 "    uint8_t *gen_code_ptr;\n"
1352 "    const uint16_t *opc_ptr;\n"
1353 "    const uint32_t *opparam_ptr;\n");
1354
1355 #ifdef HOST_ARM
1356 fprintf(outfile,
1357 "    uint8_t *last_gen_code_ptr = gen_code_buf;\n"
1358 "    LDREntry *arm_ldr_ptr = arm_ldr_table;\n"
1359 "    uint32_t *arm_data_ptr = arm_data_table;\n");
1360 #endif
1361
1362 fprintf(outfile,
1363 "\n"
1364 "    gen_code_ptr = gen_code_buf;\n"
1365 "    opc_ptr = opc_buf;\n"
1366 "    opparam_ptr = opparam_buf;\n");
1367
1368         /* Generate prologue, if needed. */
1369
1370 fprintf(outfile,
1371 "    for(;;) {\n"
1372 "        switch(*opc_ptr++) {\n"
1373 );
1374
1375         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1376             const char *name;
1377             name = strtab + sym->st_name;
1378             if (strstart(name, OP_PREFIX, NULL)) {
1379 #if 0
1380                 printf("%4d: %s pos=0x%08x len=%d\n",
1381                        i, name, sym->st_value, sym->st_size);
1382 #endif
1383                 if (sym->st_shndx != (text_sec - shdr))
1384                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1385                 gen_code(name, sym->st_value, sym->st_size, outfile,
1386                          text, relocs, nb_relocs, 1);
1387             }
1388         }
1389
1390 fprintf(outfile,
1391 "        case INDEX_op_nop:\n"
1392 "            break;\n"
1393 "        case INDEX_op_nop1:\n"
1394 "            opparam_ptr++;\n"
1395 "            break;\n"
1396 "        case INDEX_op_nop2:\n"
1397 "            opparam_ptr += 2;\n"
1398 "            break;\n"
1399 "        case INDEX_op_nop3:\n"
1400 "            opparam_ptr += 3;\n"
1401 "            break;\n"
1402 "        default:\n"
1403 "            goto the_end;\n"
1404 "        }\n");
1405
1406 #ifdef HOST_ARM
1407 /* generate constant table if needed */
1408 fprintf(outfile,
1409 "        if ((gen_code_ptr - last_gen_code_ptr) >= (MAX_FRAG_SIZE - MAX_OP_SIZE)) {\n"
1410 "            gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 1);\n"
1411 "            last_gen_code_ptr = gen_code_ptr;\n"
1412 "            arm_ldr_ptr = arm_ldr_table;\n"
1413 "            arm_data_ptr = arm_data_table;\n"
1414 "        }\n");
1415 #endif
1416
1417
1418 fprintf(outfile,
1419 "    }\n"
1420 " the_end:\n"
1421 );
1422
1423 /* generate some code patching */
1424 #ifdef HOST_ARM
1425 fprintf(outfile, "gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 0);\n");
1426 #endif
1427     /* flush instruction cache */
1428     fprintf(outfile, "flush_icache_range((unsigned long)gen_code_buf, (unsigned long)gen_code_ptr);\n");
1429
1430     fprintf(outfile, "return gen_code_ptr -  gen_code_buf;\n");
1431     fprintf(outfile, "}\n\n");
1432
1433     }
1434
1435     close(fd);
1436     return 0;
1437 }
1438
1439 void usage(void)
1440 {
1441     printf("dyngen (c) 2003 Fabrice Bellard\n"
1442            "usage: dyngen [-o outfile] [-c] objfile\n"
1443            "Generate a dynamic code generator from an object file\n"
1444            "-c     output enum of operations\n"
1445            "-g     output gen_op_xx() functions\n"
1446            );
1447     exit(1);
1448 }
1449
1450 int main(int argc, char **argv)
1451 {
1452     int c, out_type;
1453     const char *filename, *outfilename;
1454     FILE *outfile;
1455
1456     outfilename = "out.c";
1457     out_type = OUT_CODE;
1458     for(;;) {
1459         c = getopt(argc, argv, "ho:cg");
1460         if (c == -1)
1461             break;
1462         switch(c) {
1463         case 'h':
1464             usage();
1465             break;
1466         case 'o':
1467             outfilename = optarg;
1468             break;
1469         case 'c':
1470             out_type = OUT_INDEX_OP;
1471             break;
1472         case 'g':
1473             out_type = OUT_GEN_OP;
1474             break;
1475         }
1476     }
1477     if (optind >= argc)
1478         usage();
1479     filename = argv[optind];
1480     outfile = fopen(outfilename, "w");
1481     if (!outfile)
1482         error("could not open '%s'", outfilename);
1483     load_elf(filename, outfile, out_type);
1484     fclose(outfile);
1485     return 0;
1486 }