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 #else
  83 #error unsupported CPU - please update the code
  84 #endif
  85
  86 #include "elf.h"
  87
  88 #if ELF_CLASS == ELFCLASS32
  89 typedef int32_t host_long;
  90 typedef uint32_t host_ulong;
  91 #define swabls(x) swab32s(x)
  92 #else
  93 typedef int64_t host_long;
  94 typedef uint64_t host_ulong;
  95 #define swabls(x) swab64s(x)
  96 #endif
  97
  98 #ifdef ELF_USES_RELOCA
  99 #define SHT_RELOC SHT_RELA
 100 #else
 101 #define SHT_RELOC SHT_REL
 102 #endif
 103
 104 #include "thunk.h"
 105
 106 /* all dynamically generated functions begin with this code */
 107 #define OP_PREFIX "op_"
 108
 109 int elf_must_swap(struct elfhdr *h)
 110 {
 111   union {
 112       uint32_t i;
 113       uint8_t b[4];
 114   } swaptest;
 115
 116   swaptest.i = 1;
 117   return (h->e_ident[EI_DATA] == ELFDATA2MSB) !=
 118       (swaptest.b[0] == 0);
 119 }
 120
 121 void swab16s(uint16_t *p)
 122 {
 123     *p = bswap16(*p);
 124 }
 125
 126 void swab32s(uint32_t *p)
 127 {
 128     *p = bswap32(*p);
 129 }
 130
 131 void swab64s(uint64_t *p)
 132 {
 133     *p = bswap64(*p);
 134 }
 135
 136 void elf_swap_ehdr(struct elfhdr *h)
 137 {
 138     swab16s(&h->e_type);                        /* Object file type */
 139     swab16s(&h->        e_machine);             /* Architecture */
 140     swab32s(&h->        e_version);             /* Object file version */
 141     swabls(&h-> e_entry);               /* Entry point virtual address */
 142     swabls(&h-> e_phoff);               /* Program header table file offset */
 143     swabls(&h-> e_shoff);               /* Section header table file offset */
 144     swab32s(&h->        e_flags);               /* Processor-specific flags */
 145     swab16s(&h->        e_ehsize);              /* ELF header size in bytes */
 146     swab16s(&h->        e_phentsize);           /* Program header table entry size */
 147     swab16s(&h->        e_phnum);               /* Program header table entry count */
 148     swab16s(&h->        e_shentsize);           /* Section header table entry size */
 149     swab16s(&h->        e_shnum);               /* Section header table entry count */
 150     swab16s(&h->        e_shstrndx);            /* Section header string table index */
 151 }
 152
 153 void elf_swap_shdr(struct elf_shdr *h)
 154 {
 155   swab32s(&h->  sh_name);               /* Section name (string tbl index) */
 156   swab32s(&h->  sh_type);               /* Section type */
 157   swabls(&h->   sh_flags);              /* Section flags */
 158   swabls(&h->   sh_addr);               /* Section virtual addr at execution */
 159   swabls(&h->   sh_offset);             /* Section file offset */
 160   swabls(&h->   sh_size);               /* Section size in bytes */
 161   swab32s(&h->  sh_link);               /* Link to another section */
 162   swab32s(&h->  sh_info);               /* Additional section information */
 163   swabls(&h->   sh_addralign);          /* Section alignment */
 164   swabls(&h->   sh_entsize);            /* Entry size if section holds table */
 165 }
 166
 167 void elf_swap_phdr(struct elf_phdr *h)
 168 {
 169     swab32s(&h->p_type);                        /* Segment type */
 170     swabls(&h->p_offset);               /* Segment file offset */
 171     swabls(&h->p_vaddr);                /* Segment virtual address */
 172     swabls(&h->p_paddr);                /* Segment physical address */
 173     swabls(&h->p_filesz);               /* Segment size in file */
 174     swabls(&h->p_memsz);                /* Segment size in memory */
 175     swab32s(&h->p_flags);               /* Segment flags */
 176     swabls(&h->p_align);                /* Segment alignment */
 177 }
 178
 179 void elf_swap_rel(ELF_RELOC *rel)
 180 {
 181     swabls(&rel->r_offset);
 182     swabls(&rel->r_info);
 183 #ifdef ELF_USES_RELOCA
 184     swabls(&rel->r_addend);
 185 #endif
 186 }
 187
 188 /* ELF file info */
 189 int do_swap;
 190 struct elf_shdr *shdr;
 191 uint8_t **sdata;
 192 struct elfhdr ehdr;
 193 ElfW(Sym) *symtab;
 194 int nb_syms;
 195 char *strtab;
 196 int text_shndx;
 197
 198 uint16_t get16(uint16_t *p)
 199 {
 200     uint16_t val;
 201     val = *p;
 202     if (do_swap)
 203         val = bswap16(val);
 204     return val;
 205 }
 206
 207 uint32_t get32(uint32_t *p)
 208 {
 209     uint32_t val;
 210     val = *p;
 211     if (do_swap)
 212         val = bswap32(val);
 213     return val;
 214 }
 215
 216 void put16(uint16_t *p, uint16_t val)
 217 {
 218     if (do_swap)
 219         val = bswap16(val);
 220     *p = val;
 221 }
 222
 223 void put32(uint32_t *p, uint32_t val)
 224 {
 225     if (do_swap)
 226         val = bswap32(val);
 227     *p = val;
 228 }
 229
 230 void __attribute__((noreturn)) __attribute__((format (printf, 1, 2))) error(const char *fmt, ...)
 231 {
 232     va_list ap;
 233     va_start(ap, fmt);
 234     fprintf(stderr, "dyngen: ");
 235     vfprintf(stderr, fmt, ap);
 236     fprintf(stderr, "\n");
 237     va_end(ap);
 238     exit(1);
 239 }
 240
 241
 242 struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr,
 243                                   const char *name)
 244 {
 245     int i;
 246     const char *shname;
 247     struct elf_shdr *sec;
 248
 249     for(i = 0; i < shnum; i++) {
 250         sec = &shdr[i];
 251         if (!sec->sh_name)
 252             continue;
 253         shname = shstr + sec->sh_name;
 254         if (!strcmp(shname, name))
 255             return sec;
 256     }
 257     return NULL;
 258 }
 259
 260 int find_reloc(int sh_index)
 261 {
 262     struct elf_shdr *sec;
 263     int i;
 264
 265     for(i = 0; i < ehdr.e_shnum; i++) {
 266         sec = &shdr[i];
 267         if (sec->sh_type == SHT_RELOC && sec->sh_info == sh_index)
 268             return i;
 269     }
 270     return 0;
 271 }
 272
 273 void *load_data(int fd, long offset, unsigned int size)
 274 {
 275     char *data;
 276
 277     data = malloc(size);
 278     if (!data)
 279         return NULL;
 280     lseek(fd, offset, SEEK_SET);
 281     if (read(fd, data, size) != size) {
 282         free(data);
 283         return NULL;
 284     }
 285     return data;
 286 }
 287
 288 int strstart(const char *str, const char *val, const char **ptr)
 289 {
 290     const char *p, *q;
 291     p = str;
 292     q = val;
 293     while (*q != '\0') {
 294         if (*p != *q)
 295             return 0;
 296         p++;
 297         q++;
 298     }
 299     if (ptr)
 300         *ptr = p;
 301     return 1;
 302 }
 303
 304 #define MAX_ARGS 3
 305
 306 /* generate op code */
 307 void gen_code(const char *name, host_ulong offset, host_ulong size,
 308               FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs,
 309               int gen_switch)
 310 {
 311     int copy_size = 0;
 312     uint8_t *p_start, *p_end;
 313     host_ulong start_offset;
 314     int nb_args, i, n;
 315     uint8_t args_present[MAX_ARGS];
 316     const char *sym_name, *p;
 317     ELF_RELOC *rel;
 318
 319     /* Compute exact size excluding prologue and epilogue instructions.
 320      * Increment start_offset to skip epilogue instructions, then compute
 321      * copy_size the indicate the size of the remaining instructions (in
 322      * bytes).
 323      */
 324     p_start = text + offset;
 325     p_end = p_start + size;
 326     start_offset = offset;
 327     switch(ELF_ARCH) {
 328     case EM_386:
 329         {
 330             int len;
 331             len = p_end - p_start;
 332             if (len == 0)
 333                 error("empty code for %s", name);
 334             if (p_end[-1] == 0xc3) {
 335                 len--;
 336             } else {
 337                 error("ret or jmp expected at the end of %s", name);
 338             }
 339             copy_size = len;
 340         }
 341         break;
 342     case EM_PPC:
 343         {
 344             uint8_t *p;
 345             p = (void *)(p_end - 4);
 346             if (p == p_start)
 347                 error("empty code for %s", name);
 348             if (get32((uint32_t *)p) != 0x4e800020)
 349                 error("blr expected at the end of %s", name);
 350             copy_size = p - p_start;
 351         }
 352         break;
 353     case EM_S390:
 354         {
 355             uint8_t *p;
 356             p = (void *)(p_end - 2);
 357             if (p == p_start)
 358                 error("empty code for %s", name);
 359             if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4)
 360                 error("br %%r14 expected at the end of %s", name);
 361             copy_size = p - p_start;
 362         }
 363         break;
 364     case EM_ALPHA:
 365         {
 366             uint8_t *p;
 367             p = p_end - 4;
 368             if (p == p_start)
 369                 error("empty code for %s", name);
 370             if (get32((uint32_t *)p) != 0x6bfa8001)
 371                 error("ret expected at the end of %s", name);
 372             copy_size = p - p_start;
 373         }
 374         break;
 375     case EM_IA_64:
 376         {
 377             uint8_t *p;
 378             p = (void *)(p_end - 4);
 379             if (p == p_start)
 380                 error("empty code for %s", name);
 381             /* br.ret.sptk.many b0;; */
 382             /* 08 00 84 00 */
 383             if (get32((uint32_t *)p) != 0x00840008)
 384                 error("br.ret.sptk.many b0;; expected at the end of %s", name);
 385             copy_size = p - p_start;
 386         }
 387         break;
 388     case EM_SPARC:
 389     case EM_SPARC32PLUS:
 390         {
 391             uint32_t start_insn, end_insn1, end_insn2, skip_insn;
 392             uint8_t *p;
 393             p = (void *)(p_end - 8);
 394             if (p <= p_start)
 395                 error("empty code for %s", name);
 396             start_insn = get32((uint32_t *)(p_start + 0x0));
 397             end_insn1 = get32((uint32_t *)(p + 0x0));
 398             end_insn2 = get32((uint32_t *)(p + 0x4));
 399             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 400                 p_start += 0x4;
 401                 start_offset += 0x4;
 402                 if ((int)(start_insn | ~0x1fff) < -128)
 403                     error("Found bogus save at the start of %s", name);
 404                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 405                     error("ret; restore; not found at end of %s", name);
 406             } else {
 407                 error("No save at the beginning of %s", name);
 408             }
 409
 410             /* Skip a preceeding nop, if present.  */
 411             if (p > p_start) {
 412                 skip_insn = get32((uint32_t *)(p - 0x4));
 413                 if (skip_insn == 0x01000000)
 414                     p -= 4;
 415             }
 416
 417             copy_size = p - p_start;
 418         }
 419         break;
 420     case EM_SPARCV9:
 421         {
 422             uint32_t start_insn, end_insn1, end_insn2, skip_insn;
 423             uint8_t *p;
 424             p = (void *)(p_end - 8);
 425             if (p <= p_start)
 426                 error("empty code for %s", name);
 427             start_insn = get32((uint32_t *)(p_start + 0x0));
 428             end_insn1 = get32((uint32_t *)(p + 0x0));
 429             end_insn2 = get32((uint32_t *)(p + 0x4));
 430             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 431                 p_start += 0x4;
 432                 start_offset += 0x4;
 433                 if ((int)(start_insn | ~0x1fff) < -256)
 434                     error("Found bogus save at the start of %s", name);
 435                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 436                     error("ret; restore; not found at end of %s", name);
 437             } else {
 438                 error("No save at the beginning of %s", name);
 439             }
 440
 441             /* Skip a preceeding nop, if present.  */
 442             if (p > p_start) {
 443                 skip_insn = get32((uint32_t *)(p - 0x4));
 444                 if (skip_insn == 0x01000000)
 445                     p -= 4;
 446             }
 447
 448             copy_size = p - p_start;
 449         }
 450         break;
 451     default:
 452         error("unknown ELF architecture");
 453     }
 454
 455     /* compute the number of arguments by looking at the relocations */
 456     for(i = 0;i < MAX_ARGS; i++)
 457         args_present[i] = 0;
 458
 459     for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 460         if (rel->r_offset >= start_offset &&
 461             rel->r_offset < start_offset + copy_size) {
 462             sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 463             if (strstart(sym_name, "__op_param", &p)) {
 464                 n = strtoul(p, NULL, 10);
 465                 if (n > MAX_ARGS)
 466                     error("too many arguments in %s", name);
 467                 args_present[n - 1] = 1;
 468             }
 469         }
 470     }
 471
 472     nb_args = 0;
 473     while (nb_args < MAX_ARGS && args_present[nb_args])
 474         nb_args++;
 475     for(i = nb_args; i < MAX_ARGS; i++) {
 476         if (args_present[i])
 477             error("inconsistent argument numbering in %s", name);
 478     }
 479
 480     if (gen_switch == 2) {
 481         fprintf(outfile, "DEF(%s, %d, %d)\n", name + 3, nb_args, copy_size);
 482     } else if (gen_switch == 1) {
 483
 484         /* output C code */
 485         fprintf(outfile, "case INDEX_%s: {\n", name);
 486         if (nb_args > 0) {
 487             fprintf(outfile, "    long ");
 488             for(i = 0; i < nb_args; i++) {
 489                 if (i != 0)
 490                     fprintf(outfile, ", ");
 491                 fprintf(outfile, "param%d", i + 1);
 492             }
 493             fprintf(outfile, ";\n");
 494         }
 495         fprintf(outfile, "    extern void %s();\n", name);
 496
 497         for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 498             if (rel->r_offset >= start_offset &&
 499                 rel->r_offset < start_offset + copy_size) {
 500                 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 501                 if (*sym_name &&
 502                     !strstart(sym_name, "__op_param", NULL) &&
 503                     !strstart(sym_name, "__op_jmp", NULL)) {
 504 #if defined(HOST_SPARC)
 505                     if (sym_name[0] == '.') {
 506                         fprintf(outfile,
 507                                 "extern char __dot_%s __asm__(\"%s\");\n",
 508                                 sym_name+1, sym_name);
 509                         continue;
 510                     }
 511 #endif
 512                     fprintf(outfile, "extern char %s;\n", sym_name);
 513                 }
 514             }
 515         }
 516
 517         fprintf(outfile, "    memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name, start_offset - offset, copy_size);
 518
 519         /* emit code offset information */
 520         {
 521             ElfW(Sym) *sym;
 522             const char *sym_name, *p;
 523             target_ulong val;
 524             int n;
 525
 526             for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
 527                 sym_name = strtab + sym->st_name;
 528                 if (strstart(sym_name, "__op_label", &p)) {
 529                     uint8_t *ptr;
 530                     int addend;
 531                     unsigned long offset;
 532
 533                     /* test if the variable refers to a label inside
 534                        the code we are generating */
 535                     ptr = sdata[sym->st_shndx];
 536                     if (!ptr)
 537                         error("__op_labelN in invalid section");
 538                     offset = sym->st_value;
 539                     addend = 0;
 540 #ifdef ELF_USES_RELOCA
 541                     {
 542                         int reloc_shndx, nb_relocs1, j;
 543
 544                         /* try to find a matching relocation */
 545                         reloc_shndx = find_reloc(sym->st_shndx);
 546                         if (reloc_shndx) {
 547                             nb_relocs1 = shdr[reloc_shndx].sh_size /
 548                                 shdr[reloc_shndx].sh_entsize;
 549                             rel = (ELF_RELOC *)sdata[reloc_shndx];
 550                             for(j = 0; j < nb_relocs1; j++) {
 551                                 if (rel->r_offset == offset) {
 552                                     addend = rel->r_addend;
 553                                     break;
 554                                 }
 555                                 rel++;
 556                             }
 557                         }
 558                     }
 559 #endif
 560                     val = *(target_ulong *)(ptr + offset);
 561                     val += addend;
 562
 563                     if (val >= start_offset && val < start_offset + copy_size) {
 564                         n = strtol(p, NULL, 10);
 565                         fprintf(outfile, "    label_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n", n, val - start_offset);
 566                     }
 567                 }
 568             }
 569         }
 570
 571         /* load parameres in variables */
 572         for(i = 0; i < nb_args; i++) {
 573             fprintf(outfile, "    param%d = *opparam_ptr++;\n", i + 1);
 574         }
 575
 576         /* patch relocations */
 577 #if defined(HOST_I386)
 578             {
 579                 char name[256];
 580                 int type;
 581                 int addend;
 582                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 583                 if (rel->r_offset >= start_offset &&
 584                     rel->r_offset < start_offset + copy_size) {
 585                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 586                     if (strstart(sym_name, "__op_param", &p)) {
 587                         snprintf(name, sizeof(name), "param%s", p);
 588                     } else {
 589                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 590                     }
 591                     type = ELF32_R_TYPE(rel->r_info);
 592                     addend = get32((uint32_t *)(text + rel->r_offset));
 593                     switch(type) {
 594                     case R_386_32:
 595                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 596                                 rel->r_offset - start_offset, name, addend);
 597                         break;
 598                     case R_386_PC32:
 599                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
 600                                 rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 601                         break;
 602                     default:
 603                         error("unsupported i386 relocation (%d)", type);
 604                     }
 605                 }
 606                 }
 607             }
 608 #elif defined(HOST_PPC)
 609             {
 610                 char name[256];
 611                 int type;
 612                 int addend;
 613                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 614                     if (rel->r_offset >= start_offset &&
 615                         rel->r_offset < start_offset + copy_size) {
 616                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 617                         if (strstart(sym_name, "__op_jmp", &p)) {
 618                             int n;
 619                             n = strtol(p, NULL, 10);
 620                             /* __op_jmp relocations are done at
 621                                runtime to do translated block
 622                                chaining: the offset of the instruction
 623                                needs to be stored */
 624                             fprintf(outfile, "    jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
 625                                     n, rel->r_offset - start_offset);
 626                             continue;
 627                         }
 628
 629                         if (strstart(sym_name, "__op_param", &p)) {
 630                             snprintf(name, sizeof(name), "param%s", p);
 631                         } else {
 632                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 633                         }
 634                         type = ELF32_R_TYPE(rel->r_info);
 635                         addend = rel->r_addend;
 636                         switch(type) {
 637                         case R_PPC_ADDR32:
 638                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 639                                     rel->r_offset - start_offset, name, addend);
 640                             break;
 641                         case R_PPC_ADDR16_LO:
 642                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
 643                                     rel->r_offset - start_offset, name, addend);
 644                             break;
 645                         case R_PPC_ADDR16_HI:
 646                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
 647                                     rel->r_offset - start_offset, name, addend);
 648                             break;
 649                         case R_PPC_ADDR16_HA:
 650                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
 651                                     rel->r_offset - start_offset, name, addend);
 652                             break;
 653                         case R_PPC_REL24:
 654                             /* warning: must be at 32 MB distancy */
 655                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
 656                                     rel->r_offset - start_offset, rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 657                             break;
 658                         default:
 659                             error("unsupported powerpc relocation (%d)", type);
 660                         }
 661                     }
 662                 }
 663             }
 664 #elif defined(HOST_S390)
 665             {
 666                 char name[256];
 667                 int type;
 668                 int addend;
 669                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 670                     if (rel->r_offset >= start_offset &&
 671                         rel->r_offset < start_offset + copy_size) {
 672                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 673                         if (strstart(sym_name, "__op_param", &p)) {
 674                             snprintf(name, sizeof(name), "param%s", p);
 675                         } else {
 676                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 677                         }
 678                         type = ELF32_R_TYPE(rel->r_info);
 679                         addend = rel->r_addend;
 680                         switch(type) {
 681                         case R_390_32:
 682                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 683                                     rel->r_offset - start_offset, name, addend);
 684                             break;
 685                         case R_390_16:
 686                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
 687                                     rel->r_offset - start_offset, name, addend);
 688                             break;
 689                         case R_390_8:
 690                             fprintf(outfile, "    *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
 691                                     rel->r_offset - start_offset, name, addend);
 692                             break;
 693                         default:
 694                             error("unsupported s390 relocation (%d)", type);
 695                         }
 696                     }
 697                 }
 698             }
 699 #elif defined(HOST_ALPHA)
 700             {
 701                 for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) {
 702                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 703                         int type;
 704
 705                         type = ELF64_R_TYPE(rel->r_info);
 706                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 707                         switch (type) {
 708                         case R_ALPHA_GPDISP:
 709                             /* The gp is just 32 bit, and never changes, so it's easiest to emit it
 710                                as an immediate instead of constructing it from the pv or ra.  */
 711                             fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, gp);\n",
 712                                     rel->r_offset - start_offset);
 713                             fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, gp);\n",
 714                                     rel->r_offset - start_offset + rel->r_addend);
 715                             break;
 716                         case R_ALPHA_LITUSE:
 717                             /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
 718                                now, since some called functions (libc) need pv to be set up.  */
 719                             break;
 720                         case R_ALPHA_HINT:
 721                             /* Branch target prediction hint. Ignore for now.  Should be already
 722                                correct for in-function jumps.  */
 723                             break;
 724                         case R_ALPHA_LITERAL:
 725                             /* Load a literal from the GOT relative to the gp.  Since there's only a
 726                                single gp, nothing is to be done.  */
 727                             break;
 728                         case R_ALPHA_GPRELHIGH:
 729                             /* Handle fake relocations against __op_param symbol.  Need to emit the
 730                                high part of the immediate value instead.  Other symbols need no
 731                                special treatment.  */
 732                             if (strstart(sym_name, "__op_param", &p))
 733                                 fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, param%s);\n",
 734                                         rel->r_offset - start_offset, p);
 735                             break;
 736                         case R_ALPHA_GPRELLOW:
 737                             if (strstart(sym_name, "__op_param", &p))
 738                                 fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, param%s);\n",
 739                                         rel->r_offset - start_offset, p);
 740                             break;
 741                         case R_ALPHA_BRSGP:
 742                             /* PC-relative jump. Tweak offset to skip the two instructions that try to
 743                                set up the gp from the pv.  */
 744                             fprintf(outfile, "    fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
 745                                     rel->r_offset - start_offset, sym_name, rel->r_offset - start_offset);
 746                             break;
 747                         default:
 748                             error("unsupported Alpha relocation (%d)", type);
 749                         }
 750                     }
 751                 }
 752             }
 753 #elif defined(HOST_IA64)
 754             {
 755                 char name[256];
 756                 int type;
 757                 int addend;
 758                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 759                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 760                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 761                         if (strstart(sym_name, "__op_param", &p)) {
 762                             snprintf(name, sizeof(name), "param%s", p);
 763                         } else {
 764                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 765                         }
 766                         type = ELF64_R_TYPE(rel->r_info);
 767                         addend = rel->r_addend;
 768                         switch(type) {
 769                         case R_IA64_LTOFF22:
 770                             error("must implemnt R_IA64_LTOFF22 relocation");
 771                         case R_IA64_PCREL21B:
 772                             error("must implemnt R_IA64_PCREL21B relocation");
 773                         default:
 774                             error("unsupported ia64 relocation (%d)", type);
 775                         }
 776                     }
 777                 }
 778             }
 779 #elif defined(HOST_SPARC)
 780             {
 781                 char name[256];
 782                 int type;
 783                 int addend;
 784                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 785                     if (rel->r_offset >= start_offset &&
 786                         rel->r_offset < start_offset + copy_size) {
 787                         sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 788                         if (strstart(sym_name, "__op_param", &p)) {
 789                             snprintf(name, sizeof(name), "param%s", p);
 790                         } else {
 791                                 if (sym_name[0] == '.')
 792                                         snprintf(name, sizeof(name),
 793                                                  "(long)(&__dot_%s)",
 794                                                  sym_name + 1);
 795                                 else
 796                                         snprintf(name, sizeof(name),
 797                                                  "(long)(&%s)", sym_name);
 798                         }
 799                         type = ELF32_R_TYPE(rel->r_info);
 800                         addend = rel->r_addend;
 801                         switch(type) {
 802                         case R_SPARC_32:
 803                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 804                                     rel->r_offset - start_offset, name, addend);
 805                             break;
 806                         case R_SPARC_HI22:
 807                             fprintf(outfile,
 808                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 809                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 810                                     " & ~0x3fffff) "
 811                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
 812                                     rel->r_offset - start_offset,
 813                                     rel->r_offset - start_offset,
 814                                     name, addend);
 815                             break;
 816                         case R_SPARC_LO10:
 817                             fprintf(outfile,
 818                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 819                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 820                                     " & ~0x3ff) "
 821                                     " | ((%s + %d) & 0x3ff);\n",
 822                                     rel->r_offset - start_offset,
 823                                     rel->r_offset - start_offset,
 824                                     name, addend);
 825                             break;
 826                         case R_SPARC_WDISP30:
 827                             fprintf(outfile,
 828                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 829                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 830                                     " & ~0x3fffffff) "
 831                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
 832                                     "    & 0x3fffffff);\n",
 833                                     rel->r_offset - start_offset,
 834                                     rel->r_offset - start_offset,
 835                                     name, addend,
 836                                     rel->r_offset - start_offset);
 837                             break;
 838                         default:
 839                             error("unsupported sparc relocation (%d)", type);
 840                         }
 841                     }
 842                 }
 843             }
 844 #elif defined(HOST_SPARC64)
 845             {
 846                 char name[256];
 847                 int type;
 848                 int addend;
 849                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 850                     if (rel->r_offset >= start_offset &&
 851                         rel->r_offset < start_offset + copy_size) {
 852                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 853                         if (strstart(sym_name, "__op_param", &p)) {
 854                             snprintf(name, sizeof(name), "param%s", p);
 855                         } else {
 856                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 857                         }
 858                         type = ELF64_R_TYPE(rel->r_info);
 859                         addend = rel->r_addend;
 860                         switch(type) {
 861                         case R_SPARC_32:
 862                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 863                                     rel->r_offset - start_offset, name, addend);
 864                             break;
 865                         case R_SPARC_HI22:
 866                             fprintf(outfile,
 867                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 868                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 869                                     " & ~0x3fffff) "
 870                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
 871                                     rel->r_offset - start_offset,
 872                                     rel->r_offset - start_offset,
 873                                     name, addend);
 874                             break;
 875                         case R_SPARC_LO10:
 876                             fprintf(outfile,
 877                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 878                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 879                                     " & ~0x3ff) "
 880                                     " | ((%s + %d) & 0x3ff);\n",
 881                                     rel->r_offset - start_offset,
 882                                     rel->r_offset - start_offset,
 883                                     name, addend);
 884                             break;
 885                         case R_SPARC_WDISP30:
 886                             fprintf(outfile,
 887                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 888                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 889                                     " & ~0x3fffffff) "
 890                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
 891                                     "    & 0x3fffffff);\n",
 892                                     rel->r_offset - start_offset,
 893                                     rel->r_offset - start_offset,
 894                                     name, addend,
 895                                     rel->r_offset - start_offset);
 896                             break;
 897                         default:
 898                             error("unsupported sparc64 relocation (%d)", type);
 899                         }
 900                     }
 901                 }
 902             }
 903 #else
 904 #error unsupported CPU
 905 #endif
 906         fprintf(outfile, "    gen_code_ptr += %d;\n", copy_size);
 907         fprintf(outfile, "}\n");
 908         fprintf(outfile, "break;\n\n");
 909     } else {
 910         fprintf(outfile, "static inline void gen_%s(", name);
 911         if (nb_args == 0) {
 912             fprintf(outfile, "void");
 913         } else {
 914             for(i = 0; i < nb_args; i++) {
 915                 if (i != 0)
 916                     fprintf(outfile, ", ");
 917                 fprintf(outfile, "long param%d", i + 1);
 918             }
 919         }
 920         fprintf(outfile, ")\n");
 921         fprintf(outfile, "{\n");
 922         for(i = 0; i < nb_args; i++) {
 923             fprintf(outfile, "    *gen_opparam_ptr++ = param%d;\n", i + 1);
 924         }
 925         fprintf(outfile, "    *gen_opc_ptr++ = INDEX_%s;\n", name);
 926         fprintf(outfile, "}\n\n");
 927     }
 928 }
 929
 930 /* load an elf object file */
 931 int load_elf(const char *filename, FILE *outfile, int do_print_enum)
 932 {
 933     int fd;
 934     struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec;
 935     int i, j;
 936     ElfW(Sym) *sym;
 937     char *shstr;
 938     uint8_t *text;
 939     ELF_RELOC *relocs;
 940     int nb_relocs;
 941     ELF_RELOC *rel;
 942
 943     fd = open(filename, O_RDONLY);
 944     if (fd < 0)
 945         error("can't open file '%s'", filename);
 946
 947     /* Read ELF header.  */
 948     if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
 949         error("unable to read file header");
 950
 951     /* Check ELF identification.  */
 952     if (ehdr.e_ident[EI_MAG0] != ELFMAG0
 953      || ehdr.e_ident[EI_MAG1] != ELFMAG1
 954      || ehdr.e_ident[EI_MAG2] != ELFMAG2
 955      || ehdr.e_ident[EI_MAG3] != ELFMAG3
 956      || ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
 957         error("bad ELF header");
 958     }
 959
 960     do_swap = elf_must_swap(&ehdr);
 961     if (do_swap)
 962         elf_swap_ehdr(&ehdr);
 963     if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
 964         error("Unsupported ELF class");
 965     if (ehdr.e_type != ET_REL)
 966         error("ELF object file expected");
 967     if (ehdr.e_version != EV_CURRENT)
 968         error("Invalid ELF version");
 969     if (!elf_check_arch(ehdr.e_machine))
 970         error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
 971
 972     /* read section headers */
 973     shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr));
 974     if (do_swap) {
 975         for(i = 0; i < ehdr.e_shnum; i++) {
 976             elf_swap_shdr(&shdr[i]);
 977         }
 978     }
 979
 980     /* read all section data */
 981     sdata = malloc(sizeof(void *) * ehdr.e_shnum);
 982     memset(sdata, 0, sizeof(void *) * ehdr.e_shnum);
 983
 984     for(i = 0;i < ehdr.e_shnum; i++) {
 985         sec = &shdr[i];
 986         if (sec->sh_type != SHT_NOBITS)
 987             sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size);
 988     }
 989
 990     sec = &shdr[ehdr.e_shstrndx];
 991     shstr = sdata[ehdr.e_shstrndx];
 992
 993     /* swap relocations */
 994     for(i = 0; i < ehdr.e_shnum; i++) {
 995         sec = &shdr[i];
 996         if (sec->sh_type == SHT_RELOC) {
 997             nb_relocs = sec->sh_size / sec->sh_entsize;
 998             if (do_swap) {
 999                 for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++)
1000                     elf_swap_rel(rel);
1001             }
1002         }
1003     }
1004     /* text section */
1005
1006     text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
1007     if (!text_sec)
1008         error("could not find .text section");
1009     text_shndx = text_sec - shdr;
1010     text = sdata[text_shndx];
1011
1012     /* find text relocations, if any */
1013     relocs = NULL;
1014     nb_relocs = 0;
1015     i = find_reloc(text_shndx);
1016     if (i != 0) {
1017         relocs = (ELF_RELOC *)sdata[i];
1018         nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize;
1019     }
1020
1021     symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
1022     if (!symtab_sec)
1023         error("could not find .symtab section");
1024     strtab_sec = &shdr[symtab_sec->sh_link];
1025
1026     symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr];
1027     strtab = sdata[symtab_sec->sh_link];
1028
1029     nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
1030     if (do_swap) {
1031         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1032             swab32s(&sym->st_name);
1033             swabls(&sym->st_value);
1034             swabls(&sym->st_size);
1035             swab16s(&sym->st_shndx);
1036         }
1037     }
1038
1039     if (do_print_enum) {
1040         fprintf(outfile, "DEF(end, 0, 0)\n");
1041         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1042             const char *name, *p;
1043             name = strtab + sym->st_name;
1044             if (strstart(name, OP_PREFIX, &p)) {
1045                 gen_code(name, sym->st_value, sym->st_size, outfile,
1046                          text, relocs, nb_relocs, 2);
1047             }
1048         }
1049     } else {
1050         /* generate big code generation switch */
1051 #ifdef HOST_ALPHA
1052 fprintf(outfile,
1053 "register int gp asm(\"$29\");\n"
1054 "static inline void immediate_ldah(void *p, int val) {\n"
1055 "    uint32_t *dest = p;\n"
1056 "    long high = ((val >> 16) + ((val >> 15) & 1)) & 0xffff;\n"
1057 "\n"
1058 "    *dest &= ~0xffff;\n"
1059 "    *dest |= high;\n"
1060 "    *dest |= 31 << 16;\n"
1061 "}\n"
1062 "static inline void immediate_lda(void *dest, int val) {\n"
1063 "    *(uint16_t *) dest = val;\n"
1064 "}\n"
1065 "void fix_bsr(void *p, int offset) {\n"
1066 "    uint32_t *dest = p;\n"
1067 "    *dest &= ~((1 << 21) - 1);\n"
1068 "    *dest |= (offset >> 2) & ((1 << 21) - 1);\n"
1069 "}\n");
1070 #endif
1071 fprintf(outfile,
1072 "int dyngen_code(uint8_t *gen_code_buf,\n"
1073 "                uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
1074 "                const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
1075 "{\n"
1076 "    uint8_t *gen_code_ptr;\n"
1077 "    const uint16_t *opc_ptr;\n"
1078 "    const uint32_t *opparam_ptr;\n"
1079 "    gen_code_ptr = gen_code_buf;\n"
1080 "    opc_ptr = opc_buf;\n"
1081 "    opparam_ptr = opparam_buf;\n");
1082
1083         /* Generate prologue, if needed. */
1084         switch(ELF_ARCH) {
1085         case EM_SPARC:
1086                 fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x9c23a080; /* sub %%sp, 128, %%sp */\n");
1087                 fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0xbc27a080; /* sub %%fp, 128, %%fp */\n");
1088                 break;
1089
1090         case EM_SPARCV9:
1091                 fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x9c23a100; /* sub %%sp, 256, %%sp */\n");
1092                 fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0xbc27a100; /* sub %%fp, 256, %%fp */\n");
1093                 break;
1094         };
1095
1096 fprintf(outfile,
1097 "    for(;;) {\n"
1098 "        switch(*opc_ptr++) {\n"
1099 );
1100
1101         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1102             const char *name;
1103             name = strtab + sym->st_name;
1104             if (strstart(name, OP_PREFIX, NULL)) {
1105 #if 0
1106                 printf("%4d: %s pos=0x%08x len=%d\n",
1107                        i, name, sym->st_value, sym->st_size);
1108 #endif
1109                 if (sym->st_shndx != (text_sec - shdr))
1110                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1111                 gen_code(name, sym->st_value, sym->st_size, outfile,
1112                          text, relocs, nb_relocs, 1);
1113             }
1114         }
1115
1116 fprintf(outfile,
1117 "        default:\n"
1118 "            goto the_end;\n"
1119 "        }\n"
1120 "    }\n"
1121 " the_end:\n"
1122 );
1123
1124 /* generate epilogue */
1125     switch(ELF_ARCH) {
1126     case EM_386:
1127         fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
1128         break;
1129     case EM_PPC:
1130         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
1131         break;
1132     case EM_S390:
1133         fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
1134         break;
1135     case EM_ALPHA:
1136         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
1137         break;
1138     case EM_IA_64:
1139         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
1140         break;
1141     case EM_SPARC:
1142     case EM_SPARC32PLUS:
1143         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0xbc07a080; /* add %%fp, 256, %%fp */\n");
1144         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c62008; /* jmpl %%i0 + 8, %%g0 */\n");
1145         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x9c03a080; /* add %%sp, 256, %%sp */\n");
1146         break;
1147     case EM_SPARCV9:
1148         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c7e008; /* ret */\n");
1149         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81e80000; /* restore */\n");
1150         break;
1151     default:
1152         error("unknown ELF architecture");
1153     }
1154
1155     fprintf(outfile, "return gen_code_ptr -  gen_code_buf;\n");
1156     fprintf(outfile, "}\n\n");
1157
1158 /* generate gen_xxx functions */
1159 /* XXX: suppress the use of these functions to simplify code */
1160         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1161             const char *name;
1162             name = strtab + sym->st_name;
1163             if (strstart(name, OP_PREFIX, NULL)) {
1164                 if (sym->st_shndx != (text_sec - shdr))
1165                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1166                 gen_code(name, sym->st_value, sym->st_size, outfile,
1167                          text, relocs, nb_relocs, 0);
1168             }
1169         }
1170     }
1171
1172     close(fd);
1173     return 0;
1174 }
1175
1176 void usage(void)
1177 {
1178     printf("dyngen (c) 2003 Fabrice Bellard\n"
1179            "usage: dyngen [-o outfile] [-c] objfile\n"
1180            "Generate a dynamic code generator from an object file\n"
1181            "-c     output enum of operations\n"
1182            );
1183     exit(1);
1184 }
1185
1186 int main(int argc, char **argv)
1187 {
1188     int c, do_print_enum;
1189     const char *filename, *outfilename;
1190     FILE *outfile;
1191
1192     outfilename = "out.c";
1193     do_print_enum = 0;
1194     for(;;) {
1195         c = getopt(argc, argv, "ho:c");
1196         if (c == -1)
1197             break;
1198         switch(c) {
1199         case 'h':
1200             usage();
1201             break;
1202         case 'o':
1203             outfilename = optarg;
1204             break;
1205         case 'c':
1206             do_print_enum = 1;
1207             break;
1208         }
1209     }
1210     if (optind >= argc)
1211         usage();
1212     filename = argv[optind];
1213     outfile = fopen(outfilename, "w");
1214     if (!outfile)
1215         error("could not open '%s'", outfilename);
1216     load_elf(filename, outfile, do_print_enum);
1217     fclose(outfile);
1218     return 0;
1219 }