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.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_PPC)
  41
  42 #define ELF_CLASS       ELFCLASS32
  43 #define ELF_ARCH        EM_PPC
  44 #define elf_check_arch(x) ((x) == EM_PPC)
  45 #define ELF_USES_RELOCA
  46
  47 #elif defined(HOST_S390)
  48
  49 #define ELF_CLASS       ELFCLASS32
  50 #define ELF_ARCH        EM_S390
  51 #define elf_check_arch(x) ((x) == EM_S390)
  52 #define ELF_USES_RELOCA
  53
  54 #elif defined(HOST_ALPHA)
  55
  56 #define ELF_CLASS       ELFCLASS64
  57 #define ELF_ARCH        EM_ALPHA
  58 #define elf_check_arch(x) ((x) == EM_ALPHA)
  59 #define ELF_USES_RELOCA
  60
  61 #elif defined(HOST_IA64)
  62
  63 #define ELF_CLASS       ELFCLASS64
  64 #define ELF_ARCH        EM_IA_64
  65 #define elf_check_arch(x) ((x) == EM_IA_64)
  66 #define ELF_USES_RELOCA
  67
  68 #elif defined(HOST_SPARC)
  69
  70 #define ELF_CLASS       ELFCLASS32
  71 #define ELF_ARCH        EM_SPARC
  72 #define elf_check_arch(x) ((x) == EM_SPARC || (x) == EM_SPARC32PLUS)
  73 #define ELF_USES_RELOCA
  74
  75 #elif defined(HOST_SPARC64)
  76
  77 #define ELF_CLASS       ELFCLASS64
  78 #define ELF_ARCH        EM_SPARCV9
  79 #define elf_check_arch(x) ((x) == EM_SPARCV9)
  80 #define ELF_USES_RELOCA
  81
  82 #elif defined(HOST_ARM)
  83
  84 #define ELF_CLASS       ELFCLASS32
  85 #define ELF_ARCH        EM_ARM
  86 #define elf_check_arch(x) ((x) == EM_ARM)
  87 #define ELF_USES_RELOC
  88
  89 #else
  90 #error unsupported CPU - please update the code
  91 #endif
  92
  93 #include "elf.h"
  94
  95 #if ELF_CLASS == ELFCLASS32
  96 typedef int32_t host_long;
  97 typedef uint32_t host_ulong;
  98 #define swabls(x) swab32s(x)
  99 #else
 100 typedef int64_t host_long;
 101 typedef uint64_t host_ulong;
 102 #define swabls(x) swab64s(x)
 103 #endif
 104
 105 #ifdef ELF_USES_RELOCA
 106 #define SHT_RELOC SHT_RELA
 107 #else
 108 #define SHT_RELOC SHT_REL
 109 #endif
 110
 111 #include "thunk.h"
 112
 113 enum {
 114     OUT_GEN_OP,
 115     OUT_CODE,
 116     OUT_INDEX_OP,
 117 };
 118
 119 /* all dynamically generated functions begin with this code */
 120 #define OP_PREFIX "op_"
 121
 122 int elf_must_swap(struct elfhdr *h)
 123 {
 124   union {
 125       uint32_t i;
 126       uint8_t b[4];
 127   } swaptest;
 128
 129   swaptest.i = 1;
 130   return (h->e_ident[EI_DATA] == ELFDATA2MSB) !=
 131       (swaptest.b[0] == 0);
 132 }
 133
 134 void swab16s(uint16_t *p)
 135 {
 136     *p = bswap16(*p);
 137 }
 138
 139 void swab32s(uint32_t *p)
 140 {
 141     *p = bswap32(*p);
 142 }
 143
 144 void swab64s(uint64_t *p)
 145 {
 146     *p = bswap64(*p);
 147 }
 148
 149 void elf_swap_ehdr(struct elfhdr *h)
 150 {
 151     swab16s(&h->e_type);                        /* Object file type */
 152     swab16s(&h->        e_machine);             /* Architecture */
 153     swab32s(&h->        e_version);             /* Object file version */
 154     swabls(&h-> e_entry);               /* Entry point virtual address */
 155     swabls(&h-> e_phoff);               /* Program header table file offset */
 156     swabls(&h-> e_shoff);               /* Section header table file offset */
 157     swab32s(&h->        e_flags);               /* Processor-specific flags */
 158     swab16s(&h->        e_ehsize);              /* ELF header size in bytes */
 159     swab16s(&h->        e_phentsize);           /* Program header table entry size */
 160     swab16s(&h->        e_phnum);               /* Program header table entry count */
 161     swab16s(&h->        e_shentsize);           /* Section header table entry size */
 162     swab16s(&h->        e_shnum);               /* Section header table entry count */
 163     swab16s(&h->        e_shstrndx);            /* Section header string table index */
 164 }
 165
 166 void elf_swap_shdr(struct elf_shdr *h)
 167 {
 168   swab32s(&h->  sh_name);               /* Section name (string tbl index) */
 169   swab32s(&h->  sh_type);               /* Section type */
 170   swabls(&h->   sh_flags);              /* Section flags */
 171   swabls(&h->   sh_addr);               /* Section virtual addr at execution */
 172   swabls(&h->   sh_offset);             /* Section file offset */
 173   swabls(&h->   sh_size);               /* Section size in bytes */
 174   swab32s(&h->  sh_link);               /* Link to another section */
 175   swab32s(&h->  sh_info);               /* Additional section information */
 176   swabls(&h->   sh_addralign);          /* Section alignment */
 177   swabls(&h->   sh_entsize);            /* Entry size if section holds table */
 178 }
 179
 180 void elf_swap_phdr(struct elf_phdr *h)
 181 {
 182     swab32s(&h->p_type);                        /* Segment type */
 183     swabls(&h->p_offset);               /* Segment file offset */
 184     swabls(&h->p_vaddr);                /* Segment virtual address */
 185     swabls(&h->p_paddr);                /* Segment physical address */
 186     swabls(&h->p_filesz);               /* Segment size in file */
 187     swabls(&h->p_memsz);                /* Segment size in memory */
 188     swab32s(&h->p_flags);               /* Segment flags */
 189     swabls(&h->p_align);                /* Segment alignment */
 190 }
 191
 192 void elf_swap_rel(ELF_RELOC *rel)
 193 {
 194     swabls(&rel->r_offset);
 195     swabls(&rel->r_info);
 196 #ifdef ELF_USES_RELOCA
 197     swabls(&rel->r_addend);
 198 #endif
 199 }
 200
 201 /* ELF file info */
 202 int do_swap;
 203 struct elf_shdr *shdr;
 204 uint8_t **sdata;
 205 struct elfhdr ehdr;
 206 ElfW(Sym) *symtab;
 207 int nb_syms;
 208 char *strtab;
 209 int text_shndx;
 210
 211 uint16_t get16(uint16_t *p)
 212 {
 213     uint16_t val;
 214     val = *p;
 215     if (do_swap)
 216         val = bswap16(val);
 217     return val;
 218 }
 219
 220 uint32_t get32(uint32_t *p)
 221 {
 222     uint32_t val;
 223     val = *p;
 224     if (do_swap)
 225         val = bswap32(val);
 226     return val;
 227 }
 228
 229 void put16(uint16_t *p, uint16_t val)
 230 {
 231     if (do_swap)
 232         val = bswap16(val);
 233     *p = val;
 234 }
 235
 236 void put32(uint32_t *p, uint32_t val)
 237 {
 238     if (do_swap)
 239         val = bswap32(val);
 240     *p = val;
 241 }
 242
 243 void __attribute__((noreturn)) __attribute__((format (printf, 1, 2))) error(const char *fmt, ...)
 244 {
 245     va_list ap;
 246     va_start(ap, fmt);
 247     fprintf(stderr, "dyngen: ");
 248     vfprintf(stderr, fmt, ap);
 249     fprintf(stderr, "\n");
 250     va_end(ap);
 251     exit(1);
 252 }
 253
 254
 255 struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr,
 256                                   const char *name)
 257 {
 258     int i;
 259     const char *shname;
 260     struct elf_shdr *sec;
 261
 262     for(i = 0; i < shnum; i++) {
 263         sec = &shdr[i];
 264         if (!sec->sh_name)
 265             continue;
 266         shname = shstr + sec->sh_name;
 267         if (!strcmp(shname, name))
 268             return sec;
 269     }
 270     return NULL;
 271 }
 272
 273 int find_reloc(int sh_index)
 274 {
 275     struct elf_shdr *sec;
 276     int i;
 277
 278     for(i = 0; i < ehdr.e_shnum; i++) {
 279         sec = &shdr[i];
 280         if (sec->sh_type == SHT_RELOC && sec->sh_info == sh_index)
 281             return i;
 282     }
 283     return 0;
 284 }
 285
 286 void *load_data(int fd, long offset, unsigned int size)
 287 {
 288     char *data;
 289
 290     data = malloc(size);
 291     if (!data)
 292         return NULL;
 293     lseek(fd, offset, SEEK_SET);
 294     if (read(fd, data, size) != size) {
 295         free(data);
 296         return NULL;
 297     }
 298     return data;
 299 }
 300
 301 int strstart(const char *str, const char *val, const char **ptr)
 302 {
 303     const char *p, *q;
 304     p = str;
 305     q = val;
 306     while (*q != '\0') {
 307         if (*p != *q)
 308             return 0;
 309         p++;
 310         q++;
 311     }
 312     if (ptr)
 313         *ptr = p;
 314     return 1;
 315 }
 316
 317 #ifdef HOST_ARM
 318
 319 int arm_emit_ldr_info(const char *name, unsigned long start_offset,
 320                       FILE *outfile, uint8_t *p_start, uint8_t *p_end,
 321                       ELF_RELOC *relocs, int nb_relocs)
 322 {
 323     uint8_t *p;
 324     uint32_t insn;
 325     int offset, min_offset, pc_offset, data_size;
 326     uint8_t data_allocated[1024];
 327     unsigned int data_index;
 328
 329     memset(data_allocated, 0, sizeof(data_allocated));
 330
 331     p = p_start;
 332     min_offset = p_end - p_start;
 333     while (p < p_start + min_offset) {
 334         insn = get32((uint32_t *)p);
 335         if ((insn & 0x0d5f0000) == 0x051f0000) {
 336             /* ldr reg, [pc, #im] */
 337             offset = insn & 0xfff;
 338             if (!(insn & 0x00800000))
 339                         offset = -offset;
 340             if ((offset & 3) !=0)
 341                 error("%s:%04x: ldr pc offset must be 32 bit aligned",
 342                       name, start_offset + p - p_start);
 343             pc_offset = p - p_start + offset + 8;
 344             if (pc_offset <= (p - p_start) ||
 345                 pc_offset >= (p_end - p_start))
 346                 error("%s:%04x: ldr pc offset must point inside the function code",
 347                       name, start_offset + p - p_start);
 348             if (pc_offset < min_offset)
 349                 min_offset = pc_offset;
 350             if (outfile) {
 351                 /* ldr position */
 352                 fprintf(outfile, "    arm_ldr_ptr->ptr = gen_code_ptr + %d;\n",
 353                         p - p_start);
 354                 /* ldr data index */
 355                 data_index = ((p_end - p_start) - pc_offset - 4) >> 2;
 356                 fprintf(outfile, "    arm_ldr_ptr->data_ptr = arm_data_ptr + %d;\n",
 357                         data_index);
 358                 fprintf(outfile, "    arm_ldr_ptr++;\n");
 359                 if (data_index >= sizeof(data_allocated))
 360                     error("%s: too many data", name);
 361                 if (!data_allocated[data_index]) {
 362                     ELF_RELOC *rel;
 363                     int i, addend, type;
 364                     const char *sym_name, *p;
 365                     char relname[1024];
 366
 367                     data_allocated[data_index] = 1;
 368
 369                     /* data value */
 370                     addend = get32((uint32_t *)(p_start + pc_offset));
 371                     relname[0] = '\0';
 372                     for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 373                         if (rel->r_offset == (pc_offset + start_offset)) {
 374                             sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 375                             /* the compiler leave some unnecessary references to the code */
 376                             if (strstart(sym_name, "__op_param", &p)) {
 377                                 snprintf(relname, sizeof(relname), "param%s", p);
 378                             } else {
 379                                 snprintf(relname, sizeof(relname), "(long)(&%s)", sym_name);
 380                             }
 381                             type = ELF32_R_TYPE(rel->r_info);
 382                             if (type != R_ARM_ABS32)
 383                                 error("%s: unsupported data relocation", name);
 384                             break;
 385                         }
 386                     }
 387                     fprintf(outfile, "    arm_data_ptr[%d] = 0x%x",
 388                             data_index, addend);
 389                     if (relname[0] != '\0')
 390                         fprintf(outfile, " + %s", relname);
 391                     fprintf(outfile, ";\n");
 392                 }
 393             }
 394         }
 395         p += 4;
 396     }
 397     data_size = (p_end - p_start) - min_offset;
 398     if (data_size > 0 && outfile) {
 399         fprintf(outfile, "    arm_data_ptr += %d;\n", data_size >> 2);
 400     }
 401
 402     /* the last instruction must be a mov pc, lr */
 403     if (p == p_start)
 404         goto arm_ret_error;
 405     p -= 4;
 406     insn = get32((uint32_t *)p);
 407     if ((insn & 0xffff0000) != 0xe91b0000) {
 408     arm_ret_error:
 409         if (!outfile)
 410             printf("%s: invalid epilog\n", name);
 411     }
 412     return p - p_start;
 413 }
 414 #endif
 415
 416
 417 #define MAX_ARGS 3
 418
 419 /* generate op code */
 420 void gen_code(const char *name, host_ulong offset, host_ulong size,
 421               FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs,
 422               int gen_switch)
 423 {
 424     int copy_size = 0;
 425     uint8_t *p_start, *p_end;
 426     host_ulong start_offset;
 427     int nb_args, i, n;
 428     uint8_t args_present[MAX_ARGS];
 429     const char *sym_name, *p;
 430     ELF_RELOC *rel;
 431
 432     /* Compute exact size excluding prologue and epilogue instructions.
 433      * Increment start_offset to skip epilogue instructions, then compute
 434      * copy_size the indicate the size of the remaining instructions (in
 435      * bytes).
 436      */
 437     p_start = text + offset;
 438     p_end = p_start + size;
 439     start_offset = offset;
 440     switch(ELF_ARCH) {
 441     case EM_386:
 442         {
 443             int len;
 444             len = p_end - p_start;
 445             if (len == 0)
 446                 error("empty code for %s", name);
 447             if (p_end[-1] == 0xc3) {
 448                 len--;
 449             } else {
 450                 error("ret or jmp expected at the end of %s", name);
 451             }
 452             copy_size = len;
 453         }
 454         break;
 455     case EM_PPC:
 456         {
 457             uint8_t *p;
 458             p = (void *)(p_end - 4);
 459             if (p == p_start)
 460                 error("empty code for %s", name);
 461             if (get32((uint32_t *)p) != 0x4e800020)
 462                 error("blr expected at the end of %s", name);
 463             copy_size = p - p_start;
 464         }
 465         break;
 466     case EM_S390:
 467         {
 468             uint8_t *p;
 469             p = (void *)(p_end - 2);
 470             if (p == p_start)
 471                 error("empty code for %s", name);
 472             if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4)
 473                 error("br %%r14 expected at the end of %s", name);
 474             copy_size = p - p_start;
 475         }
 476         break;
 477     case EM_ALPHA:
 478         {
 479             uint8_t *p;
 480             p = p_end - 4;
 481             if (p == p_start)
 482                 error("empty code for %s", name);
 483             if (get32((uint32_t *)p) != 0x6bfa8001)
 484                 error("ret expected at the end of %s", name);
 485             copy_size = p - p_start;
 486         }
 487         break;
 488     case EM_IA_64:
 489         {
 490             uint8_t *p;
 491             p = (void *)(p_end - 4);
 492             if (p == p_start)
 493                 error("empty code for %s", name);
 494             /* br.ret.sptk.many b0;; */
 495             /* 08 00 84 00 */
 496             if (get32((uint32_t *)p) != 0x00840008)
 497                 error("br.ret.sptk.many b0;; expected at the end of %s", name);
 498             copy_size = p - p_start;
 499         }
 500         break;
 501     case EM_SPARC:
 502     case EM_SPARC32PLUS:
 503         {
 504             uint32_t start_insn, end_insn1, end_insn2;
 505             uint8_t *p;
 506             p = (void *)(p_end - 8);
 507             if (p <= p_start)
 508                 error("empty code for %s", name);
 509             start_insn = get32((uint32_t *)(p_start + 0x0));
 510             end_insn1 = get32((uint32_t *)(p + 0x0));
 511             end_insn2 = get32((uint32_t *)(p + 0x4));
 512             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 513                 p_start += 0x4;
 514                 start_offset += 0x4;
 515                 if ((int)(start_insn | ~0x1fff) < -128)
 516                     error("Found bogus save at the start of %s", name);
 517                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 518                     error("ret; restore; not found at end of %s", name);
 519             } else {
 520                 error("No save at the beginning of %s", name);
 521             }
 522 #if 0
 523             /* Skip a preceeding nop, if present.  */
 524             if (p > p_start) {
 525                 skip_insn = get32((uint32_t *)(p - 0x4));
 526                 if (skip_insn == 0x01000000)
 527                     p -= 4;
 528             }
 529 #endif
 530             copy_size = p - p_start;
 531         }
 532         break;
 533     case EM_SPARCV9:
 534         {
 535             uint32_t start_insn, end_insn1, end_insn2, skip_insn;
 536             uint8_t *p;
 537             p = (void *)(p_end - 8);
 538             if (p <= p_start)
 539                 error("empty code for %s", name);
 540             start_insn = get32((uint32_t *)(p_start + 0x0));
 541             end_insn1 = get32((uint32_t *)(p + 0x0));
 542             end_insn2 = get32((uint32_t *)(p + 0x4));
 543             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 544                 p_start += 0x4;
 545                 start_offset += 0x4;
 546                 if ((int)(start_insn | ~0x1fff) < -256)
 547                     error("Found bogus save at the start of %s", name);
 548                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 549                     error("ret; restore; not found at end of %s", name);
 550             } else {
 551                 error("No save at the beginning of %s", name);
 552             }
 553
 554             /* Skip a preceeding nop, if present.  */
 555             if (p > p_start) {
 556                 skip_insn = get32((uint32_t *)(p - 0x4));
 557                 if (skip_insn == 0x01000000)
 558                     p -= 4;
 559             }
 560
 561             copy_size = p - p_start;
 562         }
 563         break;
 564 #ifdef HOST_ARM
 565     case EM_ARM:
 566         if ((p_end - p_start) <= 16)
 567             error("%s: function too small", name);
 568         if (get32((uint32_t *)p_start) != 0xe1a0c00d ||
 569             (get32((uint32_t *)(p_start + 4)) & 0xffff0000) != 0xe92d0000 ||
 570             get32((uint32_t *)(p_start + 8)) != 0xe24cb004)
 571             error("%s: invalid prolog", name);
 572         p_start += 12;
 573         start_offset += 12;
 574         copy_size = arm_emit_ldr_info(name, start_offset, NULL, p_start, p_end,
 575                                       relocs, nb_relocs);
 576         break;
 577 #endif
 578     default:
 579         error("unknown ELF architecture");
 580     }
 581
 582     /* compute the number of arguments by looking at the relocations */
 583     for(i = 0;i < MAX_ARGS; i++)
 584         args_present[i] = 0;
 585
 586     for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 587         if (rel->r_offset >= start_offset &&
 588             rel->r_offset < start_offset + (p_end - p_start)) {
 589             sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 590             if (strstart(sym_name, "__op_param", &p)) {
 591                 n = strtoul(p, NULL, 10);
 592                 if (n > MAX_ARGS)
 593                     error("too many arguments in %s", name);
 594                 args_present[n - 1] = 1;
 595             }
 596         }
 597     }
 598
 599     nb_args = 0;
 600     while (nb_args < MAX_ARGS && args_present[nb_args])
 601         nb_args++;
 602     for(i = nb_args; i < MAX_ARGS; i++) {
 603         if (args_present[i])
 604             error("inconsistent argument numbering in %s", name);
 605     }
 606
 607     if (gen_switch == 2) {
 608         fprintf(outfile, "DEF(%s, %d, %d)\n", name + 3, nb_args, copy_size);
 609     } else if (gen_switch == 1) {
 610
 611         /* output C code */
 612         fprintf(outfile, "case INDEX_%s: {\n", name);
 613         if (nb_args > 0) {
 614             fprintf(outfile, "    long ");
 615             for(i = 0; i < nb_args; i++) {
 616                 if (i != 0)
 617                     fprintf(outfile, ", ");
 618                 fprintf(outfile, "param%d", i + 1);
 619             }
 620             fprintf(outfile, ";\n");
 621         }
 622         fprintf(outfile, "    extern void %s();\n", name);
 623
 624         for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 625             if (rel->r_offset >= start_offset &&
 626                 rel->r_offset < start_offset + (p_end - p_start)) {
 627                 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 628                 if (*sym_name &&
 629                     !strstart(sym_name, "__op_param", NULL) &&
 630                     !strstart(sym_name, "__op_jmp", NULL)) {
 631 #if defined(HOST_SPARC)
 632                     if (sym_name[0] == '.') {
 633                         fprintf(outfile,
 634                                 "extern char __dot_%s __asm__(\"%s\");\n",
 635                                 sym_name+1, sym_name);
 636                         continue;
 637                     }
 638 #endif
 639                     fprintf(outfile, "extern char %s;\n", sym_name);
 640                 }
 641             }
 642         }
 643
 644         fprintf(outfile, "    memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name, start_offset - offset, copy_size);
 645
 646         /* emit code offset information */
 647         {
 648             ElfW(Sym) *sym;
 649             const char *sym_name, *p;
 650             target_ulong val;
 651             int n;
 652
 653             for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
 654                 sym_name = strtab + sym->st_name;
 655                 if (strstart(sym_name, "__op_label", &p)) {
 656                     uint8_t *ptr;
 657                     int addend;
 658                     unsigned long offset;
 659
 660                     /* test if the variable refers to a label inside
 661                        the code we are generating */
 662                     ptr = sdata[sym->st_shndx];
 663                     if (!ptr)
 664                         error("__op_labelN in invalid section");
 665                     offset = sym->st_value;
 666                     addend = 0;
 667 #ifdef ELF_USES_RELOCA
 668                     {
 669                         int reloc_shndx, nb_relocs1, j;
 670
 671                         /* try to find a matching relocation */
 672                         reloc_shndx = find_reloc(sym->st_shndx);
 673                         if (reloc_shndx) {
 674                             nb_relocs1 = shdr[reloc_shndx].sh_size /
 675                                 shdr[reloc_shndx].sh_entsize;
 676                             rel = (ELF_RELOC *)sdata[reloc_shndx];
 677                             for(j = 0; j < nb_relocs1; j++) {
 678                                 if (rel->r_offset == offset) {
 679                                     addend = rel->r_addend;
 680                                     break;
 681                                 }
 682                                 rel++;
 683                             }
 684                         }
 685                     }
 686 #endif
 687                     val = *(target_ulong *)(ptr + offset);
 688                     val += addend;
 689
 690                     if (val >= start_offset && val < start_offset + copy_size) {
 691                         n = strtol(p, NULL, 10);
 692                         fprintf(outfile, "    label_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n", n, val - start_offset);
 693                     }
 694                 }
 695             }
 696         }
 697
 698         /* load parameres in variables */
 699         for(i = 0; i < nb_args; i++) {
 700             fprintf(outfile, "    param%d = *opparam_ptr++;\n", i + 1);
 701         }
 702
 703         /* patch relocations */
 704 #if defined(HOST_I386)
 705             {
 706                 char name[256];
 707                 int type;
 708                 int addend;
 709                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 710                 if (rel->r_offset >= start_offset &&
 711                     rel->r_offset < start_offset + copy_size) {
 712                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 713                     if (strstart(sym_name, "__op_param", &p)) {
 714                         snprintf(name, sizeof(name), "param%s", p);
 715                     } else {
 716                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 717                     }
 718                     type = ELF32_R_TYPE(rel->r_info);
 719                     addend = get32((uint32_t *)(text + rel->r_offset));
 720                     switch(type) {
 721                     case R_386_32:
 722                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 723                                 rel->r_offset - start_offset, name, addend);
 724                         break;
 725                     case R_386_PC32:
 726                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
 727                                 rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 728                         break;
 729                     default:
 730                         error("unsupported i386 relocation (%d)", type);
 731                     }
 732                 }
 733                 }
 734             }
 735 #elif defined(HOST_PPC)
 736             {
 737                 char name[256];
 738                 int type;
 739                 int addend;
 740                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 741                     if (rel->r_offset >= start_offset &&
 742                         rel->r_offset < start_offset + copy_size) {
 743                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 744                         if (strstart(sym_name, "__op_jmp", &p)) {
 745                             int n;
 746                             n = strtol(p, NULL, 10);
 747                             /* __op_jmp relocations are done at
 748                                runtime to do translated block
 749                                chaining: the offset of the instruction
 750                                needs to be stored */
 751                             fprintf(outfile, "    jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
 752                                     n, rel->r_offset - start_offset);
 753                             continue;
 754                         }
 755
 756                         if (strstart(sym_name, "__op_param", &p)) {
 757                             snprintf(name, sizeof(name), "param%s", p);
 758                         } else {
 759                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 760                         }
 761                         type = ELF32_R_TYPE(rel->r_info);
 762                         addend = rel->r_addend;
 763                         switch(type) {
 764                         case R_PPC_ADDR32:
 765                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 766                                     rel->r_offset - start_offset, name, addend);
 767                             break;
 768                         case R_PPC_ADDR16_LO:
 769                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
 770                                     rel->r_offset - start_offset, name, addend);
 771                             break;
 772                         case R_PPC_ADDR16_HI:
 773                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
 774                                     rel->r_offset - start_offset, name, addend);
 775                             break;
 776                         case R_PPC_ADDR16_HA:
 777                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
 778                                     rel->r_offset - start_offset, name, addend);
 779                             break;
 780                         case R_PPC_REL24:
 781                             /* warning: must be at 32 MB distancy */
 782                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
 783                                     rel->r_offset - start_offset, rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 784                             break;
 785                         default:
 786                             error("unsupported powerpc relocation (%d)", type);
 787                         }
 788                     }
 789                 }
 790             }
 791 #elif defined(HOST_S390)
 792             {
 793                 char name[256];
 794                 int type;
 795                 int addend;
 796                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 797                     if (rel->r_offset >= start_offset &&
 798                         rel->r_offset < start_offset + copy_size) {
 799                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 800                         if (strstart(sym_name, "__op_param", &p)) {
 801                             snprintf(name, sizeof(name), "param%s", p);
 802                         } else {
 803                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 804                         }
 805                         type = ELF32_R_TYPE(rel->r_info);
 806                         addend = rel->r_addend;
 807                         switch(type) {
 808                         case R_390_32:
 809                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 810                                     rel->r_offset - start_offset, name, addend);
 811                             break;
 812                         case R_390_16:
 813                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
 814                                     rel->r_offset - start_offset, name, addend);
 815                             break;
 816                         case R_390_8:
 817                             fprintf(outfile, "    *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
 818                                     rel->r_offset - start_offset, name, addend);
 819                             break;
 820                         default:
 821                             error("unsupported s390 relocation (%d)", type);
 822                         }
 823                     }
 824                 }
 825             }
 826 #elif defined(HOST_ALPHA)
 827             {
 828                 for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) {
 829                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 830                         int type;
 831
 832                         type = ELF64_R_TYPE(rel->r_info);
 833                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 834                         switch (type) {
 835                         case R_ALPHA_GPDISP:
 836                             /* The gp is just 32 bit, and never changes, so it's easiest to emit it
 837                                as an immediate instead of constructing it from the pv or ra.  */
 838                             fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, gp);\n",
 839                                     rel->r_offset - start_offset);
 840                             fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, gp);\n",
 841                                     rel->r_offset - start_offset + rel->r_addend);
 842                             break;
 843                         case R_ALPHA_LITUSE:
 844                             /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
 845                                now, since some called functions (libc) need pv to be set up.  */
 846                             break;
 847                         case R_ALPHA_HINT:
 848                             /* Branch target prediction hint. Ignore for now.  Should be already
 849                                correct for in-function jumps.  */
 850                             break;
 851                         case R_ALPHA_LITERAL:
 852                             /* Load a literal from the GOT relative to the gp.  Since there's only a
 853                                single gp, nothing is to be done.  */
 854                             break;
 855                         case R_ALPHA_GPRELHIGH:
 856                             /* Handle fake relocations against __op_param symbol.  Need to emit the
 857                                high part of the immediate value instead.  Other symbols need no
 858                                special treatment.  */
 859                             if (strstart(sym_name, "__op_param", &p))
 860                                 fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, param%s);\n",
 861                                         rel->r_offset - start_offset, p);
 862                             break;
 863                         case R_ALPHA_GPRELLOW:
 864                             if (strstart(sym_name, "__op_param", &p))
 865                                 fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, param%s);\n",
 866                                         rel->r_offset - start_offset, p);
 867                             break;
 868                         case R_ALPHA_BRSGP:
 869                             /* PC-relative jump. Tweak offset to skip the two instructions that try to
 870                                set up the gp from the pv.  */
 871                             fprintf(outfile, "    fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
 872                                     rel->r_offset - start_offset, sym_name, rel->r_offset - start_offset);
 873                             break;
 874                         default:
 875                             error("unsupported Alpha relocation (%d)", type);
 876                         }
 877                     }
 878                 }
 879             }
 880 #elif defined(HOST_IA64)
 881             {
 882                 char name[256];
 883                 int type;
 884                 int addend;
 885                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 886                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 887                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 888                         if (strstart(sym_name, "__op_param", &p)) {
 889                             snprintf(name, sizeof(name), "param%s", p);
 890                         } else {
 891                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 892                         }
 893                         type = ELF64_R_TYPE(rel->r_info);
 894                         addend = rel->r_addend;
 895                         switch(type) {
 896                         case R_IA64_LTOFF22:
 897                             error("must implemnt R_IA64_LTOFF22 relocation");
 898                         case R_IA64_PCREL21B:
 899                             error("must implemnt R_IA64_PCREL21B relocation");
 900                         default:
 901                             error("unsupported ia64 relocation (%d)", type);
 902                         }
 903                     }
 904                 }
 905             }
 906 #elif defined(HOST_SPARC)
 907             {
 908                 char name[256];
 909                 int type;
 910                 int addend;
 911                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 912                     if (rel->r_offset >= start_offset &&
 913                         rel->r_offset < start_offset + copy_size) {
 914                         sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 915                         if (strstart(sym_name, "__op_param", &p)) {
 916                             snprintf(name, sizeof(name), "param%s", p);
 917                         } else {
 918                                 if (sym_name[0] == '.')
 919                                         snprintf(name, sizeof(name),
 920                                                  "(long)(&__dot_%s)",
 921                                                  sym_name + 1);
 922                                 else
 923                                         snprintf(name, sizeof(name),
 924                                                  "(long)(&%s)", sym_name);
 925                         }
 926                         type = ELF32_R_TYPE(rel->r_info);
 927                         addend = rel->r_addend;
 928                         switch(type) {
 929                         case R_SPARC_32:
 930                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 931                                     rel->r_offset - start_offset, name, addend);
 932                             break;
 933                         case R_SPARC_HI22:
 934                             fprintf(outfile,
 935                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 936                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 937                                     " & ~0x3fffff) "
 938                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
 939                                     rel->r_offset - start_offset,
 940                                     rel->r_offset - start_offset,
 941                                     name, addend);
 942                             break;
 943                         case R_SPARC_LO10:
 944                             fprintf(outfile,
 945                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 946                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 947                                     " & ~0x3ff) "
 948                                     " | ((%s + %d) & 0x3ff);\n",
 949                                     rel->r_offset - start_offset,
 950                                     rel->r_offset - start_offset,
 951                                     name, addend);
 952                             break;
 953                         case R_SPARC_WDISP30:
 954                             fprintf(outfile,
 955                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 956                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 957                                     " & ~0x3fffffff) "
 958                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
 959                                     "    & 0x3fffffff);\n",
 960                                     rel->r_offset - start_offset,
 961                                     rel->r_offset - start_offset,
 962                                     name, addend,
 963                                     rel->r_offset - start_offset);
 964                             break;
 965                         default:
 966                             error("unsupported sparc relocation (%d)", type);
 967                         }
 968                     }
 969                 }
 970             }
 971 #elif defined(HOST_SPARC64)
 972             {
 973                 char name[256];
 974                 int type;
 975                 int addend;
 976                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 977                     if (rel->r_offset >= start_offset &&
 978                         rel->r_offset < start_offset + copy_size) {
 979                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 980                         if (strstart(sym_name, "__op_param", &p)) {
 981                             snprintf(name, sizeof(name), "param%s", p);
 982                         } else {
 983                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 984                         }
 985                         type = ELF64_R_TYPE(rel->r_info);
 986                         addend = rel->r_addend;
 987                         switch(type) {
 988                         case R_SPARC_32:
 989                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 990                                     rel->r_offset - start_offset, name, addend);
 991                             break;
 992                         case R_SPARC_HI22:
 993                             fprintf(outfile,
 994                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 995                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 996                                     " & ~0x3fffff) "
 997                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
 998                                     rel->r_offset - start_offset,
 999                                     rel->r_offset - start_offset,
1000                                     name, addend);
1001                             break;
1002                         case R_SPARC_LO10:
1003                             fprintf(outfile,
1004                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1005                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1006                                     " & ~0x3ff) "
1007                                     " | ((%s + %d) & 0x3ff);\n",
1008                                     rel->r_offset - start_offset,
1009                                     rel->r_offset - start_offset,
1010                                     name, addend);
1011                             break;
1012                         case R_SPARC_WDISP30:
1013                             fprintf(outfile,
1014                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1015                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1016                                     " & ~0x3fffffff) "
1017                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
1018                                     "    & 0x3fffffff);\n",
1019                                     rel->r_offset - start_offset,
1020                                     rel->r_offset - start_offset,
1021                                     name, addend,
1022                                     rel->r_offset - start_offset);
1023                             break;
1024                         default:
1025                             error("unsupported sparc64 relocation (%d)", type);
1026                         }
1027                     }
1028                 }
1029             }
1030 #elif defined(HOST_ARM)
1031             {
1032                 char name[256];
1033                 int type;
1034                 int addend;
1035
1036                 arm_emit_ldr_info(name, start_offset, outfile, p_start, p_end,
1037                                   relocs, nb_relocs);
1038
1039                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1040                 if (rel->r_offset >= start_offset &&
1041                     rel->r_offset < start_offset + copy_size) {
1042                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
1043                     /* the compiler leave some unnecessary references to the code */
1044                     if (sym_name[0] == '\0')
1045                         continue;
1046                     if (strstart(sym_name, "__op_param", &p)) {
1047                         snprintf(name, sizeof(name), "param%s", p);
1048                     } else {
1049                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1050                     }
1051                     type = ELF32_R_TYPE(rel->r_info);
1052                     addend = get32((uint32_t *)(text + rel->r_offset));
1053                     switch(type) {
1054                     case R_ARM_ABS32:
1055                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1056                                 rel->r_offset - start_offset, name, addend);
1057                         break;
1058                     case R_ARM_PC24:
1059                         fprintf(outfile, "    arm_reloc_pc24((uint32_t *)(gen_code_ptr + %d), 0x%x, %s);\n",
1060                                 rel->r_offset - start_offset, addend, name);
1061                         break;
1062                     default:
1063                         error("unsupported arm relocation (%d)", type);
1064                     }
1065                 }
1066                 }
1067             }
1068 #else
1069 #error unsupported CPU
1070 #endif
1071         fprintf(outfile, "    gen_code_ptr += %d;\n", copy_size);
1072         fprintf(outfile, "}\n");
1073         fprintf(outfile, "break;\n\n");
1074     } else {
1075         fprintf(outfile, "static inline void gen_%s(", name);
1076         if (nb_args == 0) {
1077             fprintf(outfile, "void");
1078         } else {
1079             for(i = 0; i < nb_args; i++) {
1080                 if (i != 0)
1081                     fprintf(outfile, ", ");
1082                 fprintf(outfile, "long param%d", i + 1);
1083             }
1084         }
1085         fprintf(outfile, ")\n");
1086         fprintf(outfile, "{\n");
1087         for(i = 0; i < nb_args; i++) {
1088             fprintf(outfile, "    *gen_opparam_ptr++ = param%d;\n", i + 1);
1089         }
1090         fprintf(outfile, "    *gen_opc_ptr++ = INDEX_%s;\n", name);
1091         fprintf(outfile, "}\n\n");
1092     }
1093 }
1094
1095 /* load an elf object file */
1096 int load_elf(const char *filename, FILE *outfile, int out_type)
1097 {
1098     int fd;
1099     struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec;
1100     int i, j;
1101     ElfW(Sym) *sym;
1102     char *shstr;
1103     uint8_t *text;
1104     ELF_RELOC *relocs;
1105     int nb_relocs;
1106     ELF_RELOC *rel;
1107
1108     fd = open(filename, O_RDONLY);
1109     if (fd < 0)
1110         error("can't open file '%s'", filename);
1111
1112     /* Read ELF header.  */
1113     if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
1114         error("unable to read file header");
1115
1116     /* Check ELF identification.  */
1117     if (ehdr.e_ident[EI_MAG0] != ELFMAG0
1118      || ehdr.e_ident[EI_MAG1] != ELFMAG1
1119      || ehdr.e_ident[EI_MAG2] != ELFMAG2
1120      || ehdr.e_ident[EI_MAG3] != ELFMAG3
1121      || ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
1122         error("bad ELF header");
1123     }
1124
1125     do_swap = elf_must_swap(&ehdr);
1126     if (do_swap)
1127         elf_swap_ehdr(&ehdr);
1128     if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
1129         error("Unsupported ELF class");
1130     if (ehdr.e_type != ET_REL)
1131         error("ELF object file expected");
1132     if (ehdr.e_version != EV_CURRENT)
1133         error("Invalid ELF version");
1134     if (!elf_check_arch(ehdr.e_machine))
1135         error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
1136
1137     /* read section headers */
1138     shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr));
1139     if (do_swap) {
1140         for(i = 0; i < ehdr.e_shnum; i++) {
1141             elf_swap_shdr(&shdr[i]);
1142         }
1143     }
1144
1145     /* read all section data */
1146     sdata = malloc(sizeof(void *) * ehdr.e_shnum);
1147     memset(sdata, 0, sizeof(void *) * ehdr.e_shnum);
1148
1149     for(i = 0;i < ehdr.e_shnum; i++) {
1150         sec = &shdr[i];
1151         if (sec->sh_type != SHT_NOBITS)
1152             sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size);
1153     }
1154
1155     sec = &shdr[ehdr.e_shstrndx];
1156     shstr = sdata[ehdr.e_shstrndx];
1157
1158     /* swap relocations */
1159     for(i = 0; i < ehdr.e_shnum; i++) {
1160         sec = &shdr[i];
1161         if (sec->sh_type == SHT_RELOC) {
1162             nb_relocs = sec->sh_size / sec->sh_entsize;
1163             if (do_swap) {
1164                 for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++)
1165                     elf_swap_rel(rel);
1166             }
1167         }
1168     }
1169     /* text section */
1170
1171     text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
1172     if (!text_sec)
1173         error("could not find .text section");
1174     text_shndx = text_sec - shdr;
1175     text = sdata[text_shndx];
1176
1177     /* find text relocations, if any */
1178     relocs = NULL;
1179     nb_relocs = 0;
1180     i = find_reloc(text_shndx);
1181     if (i != 0) {
1182         relocs = (ELF_RELOC *)sdata[i];
1183         nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize;
1184     }
1185
1186     symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
1187     if (!symtab_sec)
1188         error("could not find .symtab section");
1189     strtab_sec = &shdr[symtab_sec->sh_link];
1190
1191     symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr];
1192     strtab = sdata[symtab_sec->sh_link];
1193
1194     nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
1195     if (do_swap) {
1196         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1197             swab32s(&sym->st_name);
1198             swabls(&sym->st_value);
1199             swabls(&sym->st_size);
1200             swab16s(&sym->st_shndx);
1201         }
1202     }
1203
1204     if (out_type == OUT_INDEX_OP) {
1205         fprintf(outfile, "DEF(end, 0, 0)\n");
1206         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1207             const char *name, *p;
1208             name = strtab + sym->st_name;
1209             if (strstart(name, OP_PREFIX, &p)) {
1210                 gen_code(name, sym->st_value, sym->st_size, outfile,
1211                          text, relocs, nb_relocs, 2);
1212             }
1213         }
1214     } else if (out_type == OUT_GEN_OP) {
1215         /* generate gen_xxx functions */
1216
1217         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1218             const char *name;
1219             name = strtab + sym->st_name;
1220             if (strstart(name, OP_PREFIX, NULL)) {
1221                 if (sym->st_shndx != (text_sec - shdr))
1222                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1223                 gen_code(name, sym->st_value, sym->st_size, outfile,
1224                          text, relocs, nb_relocs, 0);
1225             }
1226         }
1227
1228     } else {
1229         /* generate big code generation switch */
1230 fprintf(outfile,
1231 "int dyngen_code(uint8_t *gen_code_buf,\n"
1232 "                uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
1233 "                const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
1234 "{\n"
1235 "    uint8_t *gen_code_ptr;\n"
1236 "    const uint16_t *opc_ptr;\n"
1237 "    const uint32_t *opparam_ptr;\n");
1238
1239 #ifdef HOST_ARM
1240 fprintf(outfile,
1241 "    uint8_t *last_gen_code_ptr = gen_code_buf;\n"
1242 "    LDREntry *arm_ldr_ptr = arm_ldr_table;\n"
1243 "    uint32_t *arm_data_ptr = arm_data_table;\n");
1244 #endif
1245
1246 fprintf(outfile,
1247 "\n"
1248 "    gen_code_ptr = gen_code_buf;\n"
1249 "    opc_ptr = opc_buf;\n"
1250 "    opparam_ptr = opparam_buf;\n");
1251
1252         /* Generate prologue, if needed. */
1253
1254 fprintf(outfile,
1255 "    for(;;) {\n"
1256 "        switch(*opc_ptr++) {\n"
1257 );
1258
1259         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1260             const char *name;
1261             name = strtab + sym->st_name;
1262             if (strstart(name, OP_PREFIX, NULL)) {
1263 #if 0
1264                 printf("%4d: %s pos=0x%08x len=%d\n",
1265                        i, name, sym->st_value, sym->st_size);
1266 #endif
1267                 if (sym->st_shndx != (text_sec - shdr))
1268                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1269                 gen_code(name, sym->st_value, sym->st_size, outfile,
1270                          text, relocs, nb_relocs, 1);
1271             }
1272         }
1273
1274 fprintf(outfile,
1275 "        default:\n"
1276 "            goto the_end;\n"
1277 "        }\n");
1278
1279 #ifdef HOST_ARM
1280 /* generate constant table if needed */
1281 fprintf(outfile,
1282 "        if ((gen_code_ptr - last_gen_code_ptr) >= (MAX_FRAG_SIZE - MAX_OP_SIZE)) {\n"
1283 "            gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 1);\n"
1284 "            last_gen_code_ptr = gen_code_ptr;\n"
1285 "            arm_ldr_ptr = arm_ldr_table;\n"
1286 "            arm_data_ptr = arm_data_table;\n"
1287 "        }\n");
1288 #endif
1289
1290
1291 fprintf(outfile,
1292 "    }\n"
1293 " the_end:\n"
1294 );
1295
1296 /* generate epilogue */
1297     switch(ELF_ARCH) {
1298     case EM_386:
1299         fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
1300         break;
1301     case EM_PPC:
1302         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
1303         break;
1304     case EM_S390:
1305         fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
1306         break;
1307     case EM_ALPHA:
1308         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
1309         break;
1310     case EM_IA_64:
1311         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
1312         break;
1313     case EM_SPARC:
1314     case EM_SPARC32PLUS:
1315         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c62008; /* jmpl %%i0 + 8, %%g0 */\n");
1316         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x01000000; /* nop */\n");
1317         break;
1318     case EM_SPARCV9:
1319         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c7e008; /* ret */\n");
1320         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81e80000; /* restore */\n");
1321         break;
1322     case EM_ARM:
1323         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");
1324         break;
1325     default:
1326         error("unknown ELF architecture");
1327     }
1328     /* flush instruction cache */
1329     fprintf(outfile, "flush_icache_range((unsigned long)gen_code_buf, (unsigned long)gen_code_ptr);\n");
1330
1331     fprintf(outfile, "return gen_code_ptr -  gen_code_buf;\n");
1332     fprintf(outfile, "}\n\n");
1333
1334     }
1335
1336     close(fd);
1337     return 0;
1338 }
1339
1340 void usage(void)
1341 {
1342     printf("dyngen (c) 2003 Fabrice Bellard\n"
1343            "usage: dyngen [-o outfile] [-c] objfile\n"
1344            "Generate a dynamic code generator from an object file\n"
1345            "-c     output enum of operations\n"
1346            "-g     output gen_op_xx() functions\n"
1347            );
1348     exit(1);
1349 }
1350
1351 int main(int argc, char **argv)
1352 {
1353     int c, out_type;
1354     const char *filename, *outfilename;
1355     FILE *outfile;
1356
1357     outfilename = "out.c";
1358     out_type = OUT_CODE;
1359     for(;;) {
1360         c = getopt(argc, argv, "ho:cg");
1361         if (c == -1)
1362             break;
1363         switch(c) {
1364         case 'h':
1365             usage();
1366             break;
1367         case 'o':
1368             outfilename = optarg;
1369             break;
1370         case 'c':
1371             out_type = OUT_INDEX_OP;
1372             break;
1373         case 'g':
1374             out_type = OUT_GEN_OP;
1375             break;
1376         }
1377     }
1378     if (optind >= argc)
1379         usage();
1380     filename = argv[optind];
1381     outfile = fopen(outfilename, "w");
1382     if (!outfile)
1383         error("could not open '%s'", outfilename);
1384     load_elf(filename, outfile, out_type);
1385     fclose(outfile);
1386     return 0;
1387 }