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 /* all dynamically generated functions begin with this code */
 114 #define OP_PREFIX "op_"
 115
 116 int elf_must_swap(struct elfhdr *h)
 117 {
 118   union {
 119       uint32_t i;
 120       uint8_t b[4];
 121   } swaptest;
 122
 123   swaptest.i = 1;
 124   return (h->e_ident[EI_DATA] == ELFDATA2MSB) !=
 125       (swaptest.b[0] == 0);
 126 }
 127
 128 void swab16s(uint16_t *p)
 129 {
 130     *p = bswap16(*p);
 131 }
 132
 133 void swab32s(uint32_t *p)
 134 {
 135     *p = bswap32(*p);
 136 }
 137
 138 void swab64s(uint64_t *p)
 139 {
 140     *p = bswap64(*p);
 141 }
 142
 143 void elf_swap_ehdr(struct elfhdr *h)
 144 {
 145     swab16s(&h->e_type);                        /* Object file type */
 146     swab16s(&h->        e_machine);             /* Architecture */
 147     swab32s(&h->        e_version);             /* Object file version */
 148     swabls(&h-> e_entry);               /* Entry point virtual address */
 149     swabls(&h-> e_phoff);               /* Program header table file offset */
 150     swabls(&h-> e_shoff);               /* Section header table file offset */
 151     swab32s(&h->        e_flags);               /* Processor-specific flags */
 152     swab16s(&h->        e_ehsize);              /* ELF header size in bytes */
 153     swab16s(&h->        e_phentsize);           /* Program header table entry size */
 154     swab16s(&h->        e_phnum);               /* Program header table entry count */
 155     swab16s(&h->        e_shentsize);           /* Section header table entry size */
 156     swab16s(&h->        e_shnum);               /* Section header table entry count */
 157     swab16s(&h->        e_shstrndx);            /* Section header string table index */
 158 }
 159
 160 void elf_swap_shdr(struct elf_shdr *h)
 161 {
 162   swab32s(&h->  sh_name);               /* Section name (string tbl index) */
 163   swab32s(&h->  sh_type);               /* Section type */
 164   swabls(&h->   sh_flags);              /* Section flags */
 165   swabls(&h->   sh_addr);               /* Section virtual addr at execution */
 166   swabls(&h->   sh_offset);             /* Section file offset */
 167   swabls(&h->   sh_size);               /* Section size in bytes */
 168   swab32s(&h->  sh_link);               /* Link to another section */
 169   swab32s(&h->  sh_info);               /* Additional section information */
 170   swabls(&h->   sh_addralign);          /* Section alignment */
 171   swabls(&h->   sh_entsize);            /* Entry size if section holds table */
 172 }
 173
 174 void elf_swap_phdr(struct elf_phdr *h)
 175 {
 176     swab32s(&h->p_type);                        /* Segment type */
 177     swabls(&h->p_offset);               /* Segment file offset */
 178     swabls(&h->p_vaddr);                /* Segment virtual address */
 179     swabls(&h->p_paddr);                /* Segment physical address */
 180     swabls(&h->p_filesz);               /* Segment size in file */
 181     swabls(&h->p_memsz);                /* Segment size in memory */
 182     swab32s(&h->p_flags);               /* Segment flags */
 183     swabls(&h->p_align);                /* Segment alignment */
 184 }
 185
 186 void elf_swap_rel(ELF_RELOC *rel)
 187 {
 188     swabls(&rel->r_offset);
 189     swabls(&rel->r_info);
 190 #ifdef ELF_USES_RELOCA
 191     swabls(&rel->r_addend);
 192 #endif
 193 }
 194
 195 /* ELF file info */
 196 int do_swap;
 197 struct elf_shdr *shdr;
 198 uint8_t **sdata;
 199 struct elfhdr ehdr;
 200 ElfW(Sym) *symtab;
 201 int nb_syms;
 202 char *strtab;
 203 int text_shndx;
 204
 205 uint16_t get16(uint16_t *p)
 206 {
 207     uint16_t val;
 208     val = *p;
 209     if (do_swap)
 210         val = bswap16(val);
 211     return val;
 212 }
 213
 214 uint32_t get32(uint32_t *p)
 215 {
 216     uint32_t val;
 217     val = *p;
 218     if (do_swap)
 219         val = bswap32(val);
 220     return val;
 221 }
 222
 223 void put16(uint16_t *p, uint16_t val)
 224 {
 225     if (do_swap)
 226         val = bswap16(val);
 227     *p = val;
 228 }
 229
 230 void put32(uint32_t *p, uint32_t val)
 231 {
 232     if (do_swap)
 233         val = bswap32(val);
 234     *p = val;
 235 }
 236
 237 void __attribute__((noreturn)) __attribute__((format (printf, 1, 2))) error(const char *fmt, ...)
 238 {
 239     va_list ap;
 240     va_start(ap, fmt);
 241     fprintf(stderr, "dyngen: ");
 242     vfprintf(stderr, fmt, ap);
 243     fprintf(stderr, "\n");
 244     va_end(ap);
 245     exit(1);
 246 }
 247
 248
 249 struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr,
 250                                   const char *name)
 251 {
 252     int i;
 253     const char *shname;
 254     struct elf_shdr *sec;
 255
 256     for(i = 0; i < shnum; i++) {
 257         sec = &shdr[i];
 258         if (!sec->sh_name)
 259             continue;
 260         shname = shstr + sec->sh_name;
 261         if (!strcmp(shname, name))
 262             return sec;
 263     }
 264     return NULL;
 265 }
 266
 267 int find_reloc(int sh_index)
 268 {
 269     struct elf_shdr *sec;
 270     int i;
 271
 272     for(i = 0; i < ehdr.e_shnum; i++) {
 273         sec = &shdr[i];
 274         if (sec->sh_type == SHT_RELOC && sec->sh_info == sh_index)
 275             return i;
 276     }
 277     return 0;
 278 }
 279
 280 void *load_data(int fd, long offset, unsigned int size)
 281 {
 282     char *data;
 283
 284     data = malloc(size);
 285     if (!data)
 286         return NULL;
 287     lseek(fd, offset, SEEK_SET);
 288     if (read(fd, data, size) != size) {
 289         free(data);
 290         return NULL;
 291     }
 292     return data;
 293 }
 294
 295 int strstart(const char *str, const char *val, const char **ptr)
 296 {
 297     const char *p, *q;
 298     p = str;
 299     q = val;
 300     while (*q != '\0') {
 301         if (*p != *q)
 302             return 0;
 303         p++;
 304         q++;
 305     }
 306     if (ptr)
 307         *ptr = p;
 308     return 1;
 309 }
 310
 311 #ifdef HOST_ARM
 312
 313 int arm_emit_ldr_info(const char *name, unsigned long start_offset,
 314                       FILE *outfile, uint8_t *p_start, uint8_t *p_end,
 315                       ELF_RELOC *relocs, int nb_relocs)
 316 {
 317     uint8_t *p;
 318     uint32_t insn;
 319     int offset, min_offset, pc_offset, data_size;
 320     uint8_t data_allocated[1024];
 321     unsigned int data_index;
 322
 323     memset(data_allocated, 0, sizeof(data_allocated));
 324
 325     p = p_start;
 326     min_offset = p_end - p_start;
 327     while (p < p_start + min_offset) {
 328         insn = get32((uint32_t *)p);
 329         if ((insn & 0x0d5f0000) == 0x051f0000) {
 330             /* ldr reg, [pc, #im] */
 331             offset = insn & 0xfff;
 332             if (!(insn & 0x00800000))
 333                         offset = -offset;
 334             if ((offset & 3) !=0)
 335                 error("%s:%04x: ldr pc offset must be 32 bit aligned",
 336                       name, start_offset + p - p_start);
 337             pc_offset = p - p_start + offset + 8;
 338             if (pc_offset <= (p - p_start) ||
 339                 pc_offset >= (p_end - p_start))
 340                 error("%s:%04x: ldr pc offset must point inside the function code",
 341                       name, start_offset + p - p_start);
 342             if (pc_offset < min_offset)
 343                 min_offset = pc_offset;
 344             if (outfile) {
 345                 /* ldr position */
 346                 fprintf(outfile, "    arm_ldr_ptr->ptr = gen_code_ptr + %d;\n",
 347                         p - p_start);
 348                 /* ldr data index */
 349                 data_index = ((p_end - p_start) - pc_offset - 4) >> 2;
 350                 fprintf(outfile, "    arm_ldr_ptr->data_ptr = arm_data_ptr + %d;\n",
 351                         data_index);
 352                 fprintf(outfile, "    arm_ldr_ptr++;\n");
 353                 if (data_index >= sizeof(data_allocated))
 354                     error("%s: too many data", name);
 355                 if (!data_allocated[data_index]) {
 356                     ELF_RELOC *rel;
 357                     int i, addend, type;
 358                     const char *sym_name, *p;
 359                     char relname[1024];
 360
 361                     data_allocated[data_index] = 1;
 362
 363                     /* data value */
 364                     addend = get32((uint32_t *)(p_start + pc_offset));
 365                     relname[0] = '\0';
 366                     for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 367                         if (rel->r_offset == (pc_offset + start_offset)) {
 368                             sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 369                             /* the compiler leave some unnecessary references to the code */
 370                             if (strstart(sym_name, "__op_param", &p)) {
 371                                 snprintf(relname, sizeof(relname), "param%s", p);
 372                             } else {
 373                                 snprintf(relname, sizeof(relname), "(long)(&%s)", sym_name);
 374                             }
 375                             type = ELF32_R_TYPE(rel->r_info);
 376                             if (type != R_ARM_ABS32)
 377                                 error("%s: unsupported data relocation", name);
 378                             break;
 379                         }
 380                     }
 381                     fprintf(outfile, "    arm_data_ptr[%d] = 0x%x",
 382                             data_index, addend);
 383                     if (relname[0] != '\0')
 384                         fprintf(outfile, " + %s", relname);
 385                     fprintf(outfile, ";\n");
 386                 }
 387             }
 388         }
 389         p += 4;
 390     }
 391     data_size = (p_end - p_start) - min_offset;
 392     if (data_size > 0 && outfile) {
 393         fprintf(outfile, "    arm_data_ptr += %d;\n", data_size >> 2);
 394     }
 395
 396     /* the last instruction must be a mov pc, lr */
 397     if (p == p_start)
 398         goto arm_ret_error;
 399     p -= 4;
 400     insn = get32((uint32_t *)p);
 401     if ((insn & 0xffff0000) != 0xe91b0000) {
 402     arm_ret_error:
 403         if (!outfile)
 404             printf("%s: invalid epilog\n", name);
 405     }
 406     return p - p_start;
 407 }
 408 #endif
 409
 410
 411 #define MAX_ARGS 3
 412
 413 /* generate op code */
 414 void gen_code(const char *name, host_ulong offset, host_ulong size,
 415               FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs,
 416               int gen_switch)
 417 {
 418     int copy_size = 0;
 419     uint8_t *p_start, *p_end;
 420     host_ulong start_offset;
 421     int nb_args, i, n;
 422     uint8_t args_present[MAX_ARGS];
 423     const char *sym_name, *p;
 424     ELF_RELOC *rel;
 425
 426     /* Compute exact size excluding prologue and epilogue instructions.
 427      * Increment start_offset to skip epilogue instructions, then compute
 428      * copy_size the indicate the size of the remaining instructions (in
 429      * bytes).
 430      */
 431     p_start = text + offset;
 432     p_end = p_start + size;
 433     start_offset = offset;
 434     switch(ELF_ARCH) {
 435     case EM_386:
 436         {
 437             int len;
 438             len = p_end - p_start;
 439             if (len == 0)
 440                 error("empty code for %s", name);
 441             if (p_end[-1] == 0xc3) {
 442                 len--;
 443             } else {
 444                 error("ret or jmp expected at the end of %s", name);
 445             }
 446             copy_size = len;
 447         }
 448         break;
 449     case EM_PPC:
 450         {
 451             uint8_t *p;
 452             p = (void *)(p_end - 4);
 453             if (p == p_start)
 454                 error("empty code for %s", name);
 455             if (get32((uint32_t *)p) != 0x4e800020)
 456                 error("blr expected at the end of %s", name);
 457             copy_size = p - p_start;
 458         }
 459         break;
 460     case EM_S390:
 461         {
 462             uint8_t *p;
 463             p = (void *)(p_end - 2);
 464             if (p == p_start)
 465                 error("empty code for %s", name);
 466             if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4)
 467                 error("br %%r14 expected at the end of %s", name);
 468             copy_size = p - p_start;
 469         }
 470         break;
 471     case EM_ALPHA:
 472         {
 473             uint8_t *p;
 474             p = p_end - 4;
 475             if (p == p_start)
 476                 error("empty code for %s", name);
 477             if (get32((uint32_t *)p) != 0x6bfa8001)
 478                 error("ret expected at the end of %s", name);
 479             copy_size = p - p_start;
 480         }
 481         break;
 482     case EM_IA_64:
 483         {
 484             uint8_t *p;
 485             p = (void *)(p_end - 4);
 486             if (p == p_start)
 487                 error("empty code for %s", name);
 488             /* br.ret.sptk.many b0;; */
 489             /* 08 00 84 00 */
 490             if (get32((uint32_t *)p) != 0x00840008)
 491                 error("br.ret.sptk.many b0;; expected at the end of %s", name);
 492             copy_size = p - p_start;
 493         }
 494         break;
 495     case EM_SPARC:
 496     case EM_SPARC32PLUS:
 497         {
 498             uint32_t start_insn, end_insn1, end_insn2;
 499             uint8_t *p;
 500             p = (void *)(p_end - 8);
 501             if (p <= p_start)
 502                 error("empty code for %s", name);
 503             start_insn = get32((uint32_t *)(p_start + 0x0));
 504             end_insn1 = get32((uint32_t *)(p + 0x0));
 505             end_insn2 = get32((uint32_t *)(p + 0x4));
 506             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 507                 p_start += 0x4;
 508                 start_offset += 0x4;
 509                 if ((int)(start_insn | ~0x1fff) < -128)
 510                     error("Found bogus save at the start of %s", name);
 511                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 512                     error("ret; restore; not found at end of %s", name);
 513             } else {
 514                 error("No save at the beginning of %s", name);
 515             }
 516 #if 0
 517             /* Skip a preceeding nop, if present.  */
 518             if (p > p_start) {
 519                 skip_insn = get32((uint32_t *)(p - 0x4));
 520                 if (skip_insn == 0x01000000)
 521                     p -= 4;
 522             }
 523 #endif
 524             copy_size = p - p_start;
 525         }
 526         break;
 527     case EM_SPARCV9:
 528         {
 529             uint32_t start_insn, end_insn1, end_insn2, skip_insn;
 530             uint8_t *p;
 531             p = (void *)(p_end - 8);
 532             if (p <= p_start)
 533                 error("empty code for %s", name);
 534             start_insn = get32((uint32_t *)(p_start + 0x0));
 535             end_insn1 = get32((uint32_t *)(p + 0x0));
 536             end_insn2 = get32((uint32_t *)(p + 0x4));
 537             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 538                 p_start += 0x4;
 539                 start_offset += 0x4;
 540                 if ((int)(start_insn | ~0x1fff) < -256)
 541                     error("Found bogus save at the start of %s", name);
 542                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 543                     error("ret; restore; not found at end of %s", name);
 544             } else {
 545                 error("No save at the beginning of %s", name);
 546             }
 547
 548             /* Skip a preceeding nop, if present.  */
 549             if (p > p_start) {
 550                 skip_insn = get32((uint32_t *)(p - 0x4));
 551                 if (skip_insn == 0x01000000)
 552                     p -= 4;
 553             }
 554
 555             copy_size = p - p_start;
 556         }
 557         break;
 558 #ifdef HOST_ARM
 559     case EM_ARM:
 560         if ((p_end - p_start) <= 16)
 561             error("%s: function too small", name);
 562         if (get32((uint32_t *)p_start) != 0xe1a0c00d ||
 563             (get32((uint32_t *)(p_start + 4)) & 0xffff0000) != 0xe92d0000 ||
 564             get32((uint32_t *)(p_start + 8)) != 0xe24cb004)
 565             error("%s: invalid prolog", name);
 566         p_start += 12;
 567         start_offset += 12;
 568         copy_size = arm_emit_ldr_info(name, start_offset, NULL, p_start, p_end,
 569                                       relocs, nb_relocs);
 570         break;
 571 #endif
 572     default:
 573         error("unknown ELF architecture");
 574     }
 575
 576     /* compute the number of arguments by looking at the relocations */
 577     for(i = 0;i < MAX_ARGS; i++)
 578         args_present[i] = 0;
 579
 580     for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 581         if (rel->r_offset >= start_offset &&
 582             rel->r_offset < start_offset + (p_end - p_start)) {
 583             sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 584             if (strstart(sym_name, "__op_param", &p)) {
 585                 n = strtoul(p, NULL, 10);
 586                 if (n > MAX_ARGS)
 587                     error("too many arguments in %s", name);
 588                 args_present[n - 1] = 1;
 589             }
 590         }
 591     }
 592
 593     nb_args = 0;
 594     while (nb_args < MAX_ARGS && args_present[nb_args])
 595         nb_args++;
 596     for(i = nb_args; i < MAX_ARGS; i++) {
 597         if (args_present[i])
 598             error("inconsistent argument numbering in %s", name);
 599     }
 600
 601     if (gen_switch == 2) {
 602         fprintf(outfile, "DEF(%s, %d, %d)\n", name + 3, nb_args, copy_size);
 603     } else if (gen_switch == 1) {
 604
 605         /* output C code */
 606         fprintf(outfile, "case INDEX_%s: {\n", name);
 607         if (nb_args > 0) {
 608             fprintf(outfile, "    long ");
 609             for(i = 0; i < nb_args; i++) {
 610                 if (i != 0)
 611                     fprintf(outfile, ", ");
 612                 fprintf(outfile, "param%d", i + 1);
 613             }
 614             fprintf(outfile, ";\n");
 615         }
 616         fprintf(outfile, "    extern void %s();\n", name);
 617
 618         for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 619             if (rel->r_offset >= start_offset &&
 620                 rel->r_offset < start_offset + (p_end - p_start)) {
 621                 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 622                 if (*sym_name &&
 623                     !strstart(sym_name, "__op_param", NULL) &&
 624                     !strstart(sym_name, "__op_jmp", NULL)) {
 625 #if defined(HOST_SPARC)
 626                     if (sym_name[0] == '.') {
 627                         fprintf(outfile,
 628                                 "extern char __dot_%s __asm__(\"%s\");\n",
 629                                 sym_name+1, sym_name);
 630                         continue;
 631                     }
 632 #endif
 633                     fprintf(outfile, "extern char %s;\n", sym_name);
 634                 }
 635             }
 636         }
 637
 638         fprintf(outfile, "    memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name, start_offset - offset, copy_size);
 639
 640         /* emit code offset information */
 641         {
 642             ElfW(Sym) *sym;
 643             const char *sym_name, *p;
 644             target_ulong val;
 645             int n;
 646
 647             for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
 648                 sym_name = strtab + sym->st_name;
 649                 if (strstart(sym_name, "__op_label", &p)) {
 650                     uint8_t *ptr;
 651                     int addend;
 652                     unsigned long offset;
 653
 654                     /* test if the variable refers to a label inside
 655                        the code we are generating */
 656                     ptr = sdata[sym->st_shndx];
 657                     if (!ptr)
 658                         error("__op_labelN in invalid section");
 659                     offset = sym->st_value;
 660                     addend = 0;
 661 #ifdef ELF_USES_RELOCA
 662                     {
 663                         int reloc_shndx, nb_relocs1, j;
 664
 665                         /* try to find a matching relocation */
 666                         reloc_shndx = find_reloc(sym->st_shndx);
 667                         if (reloc_shndx) {
 668                             nb_relocs1 = shdr[reloc_shndx].sh_size /
 669                                 shdr[reloc_shndx].sh_entsize;
 670                             rel = (ELF_RELOC *)sdata[reloc_shndx];
 671                             for(j = 0; j < nb_relocs1; j++) {
 672                                 if (rel->r_offset == offset) {
 673                                     addend = rel->r_addend;
 674                                     break;
 675                                 }
 676                                 rel++;
 677                             }
 678                         }
 679                     }
 680 #endif
 681                     val = *(target_ulong *)(ptr + offset);
 682                     val += addend;
 683
 684                     if (val >= start_offset && val < start_offset + copy_size) {
 685                         n = strtol(p, NULL, 10);
 686                         fprintf(outfile, "    label_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n", n, val - start_offset);
 687                     }
 688                 }
 689             }
 690         }
 691
 692         /* load parameres in variables */
 693         for(i = 0; i < nb_args; i++) {
 694             fprintf(outfile, "    param%d = *opparam_ptr++;\n", i + 1);
 695         }
 696
 697         /* patch relocations */
 698 #if defined(HOST_I386)
 699             {
 700                 char name[256];
 701                 int type;
 702                 int addend;
 703                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 704                 if (rel->r_offset >= start_offset &&
 705                     rel->r_offset < start_offset + copy_size) {
 706                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 707                     if (strstart(sym_name, "__op_param", &p)) {
 708                         snprintf(name, sizeof(name), "param%s", p);
 709                     } else {
 710                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 711                     }
 712                     type = ELF32_R_TYPE(rel->r_info);
 713                     addend = get32((uint32_t *)(text + rel->r_offset));
 714                     switch(type) {
 715                     case R_386_32:
 716                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 717                                 rel->r_offset - start_offset, name, addend);
 718                         break;
 719                     case R_386_PC32:
 720                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
 721                                 rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 722                         break;
 723                     default:
 724                         error("unsupported i386 relocation (%d)", type);
 725                     }
 726                 }
 727                 }
 728             }
 729 #elif defined(HOST_PPC)
 730             {
 731                 char name[256];
 732                 int type;
 733                 int addend;
 734                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 735                     if (rel->r_offset >= start_offset &&
 736                         rel->r_offset < start_offset + copy_size) {
 737                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 738                         if (strstart(sym_name, "__op_jmp", &p)) {
 739                             int n;
 740                             n = strtol(p, NULL, 10);
 741                             /* __op_jmp relocations are done at
 742                                runtime to do translated block
 743                                chaining: the offset of the instruction
 744                                needs to be stored */
 745                             fprintf(outfile, "    jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
 746                                     n, rel->r_offset - start_offset);
 747                             continue;
 748                         }
 749
 750                         if (strstart(sym_name, "__op_param", &p)) {
 751                             snprintf(name, sizeof(name), "param%s", p);
 752                         } else {
 753                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 754                         }
 755                         type = ELF32_R_TYPE(rel->r_info);
 756                         addend = rel->r_addend;
 757                         switch(type) {
 758                         case R_PPC_ADDR32:
 759                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 760                                     rel->r_offset - start_offset, name, addend);
 761                             break;
 762                         case R_PPC_ADDR16_LO:
 763                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
 764                                     rel->r_offset - start_offset, name, addend);
 765                             break;
 766                         case R_PPC_ADDR16_HI:
 767                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
 768                                     rel->r_offset - start_offset, name, addend);
 769                             break;
 770                         case R_PPC_ADDR16_HA:
 771                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
 772                                     rel->r_offset - start_offset, name, addend);
 773                             break;
 774                         case R_PPC_REL24:
 775                             /* warning: must be at 32 MB distancy */
 776                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
 777                                     rel->r_offset - start_offset, rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 778                             break;
 779                         default:
 780                             error("unsupported powerpc relocation (%d)", type);
 781                         }
 782                     }
 783                 }
 784             }
 785 #elif defined(HOST_S390)
 786             {
 787                 char name[256];
 788                 int type;
 789                 int addend;
 790                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 791                     if (rel->r_offset >= start_offset &&
 792                         rel->r_offset < start_offset + copy_size) {
 793                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 794                         if (strstart(sym_name, "__op_param", &p)) {
 795                             snprintf(name, sizeof(name), "param%s", p);
 796                         } else {
 797                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 798                         }
 799                         type = ELF32_R_TYPE(rel->r_info);
 800                         addend = rel->r_addend;
 801                         switch(type) {
 802                         case R_390_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_390_16:
 807                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
 808                                     rel->r_offset - start_offset, name, addend);
 809                             break;
 810                         case R_390_8:
 811                             fprintf(outfile, "    *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
 812                                     rel->r_offset - start_offset, name, addend);
 813                             break;
 814                         default:
 815                             error("unsupported s390 relocation (%d)", type);
 816                         }
 817                     }
 818                 }
 819             }
 820 #elif defined(HOST_ALPHA)
 821             {
 822                 for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) {
 823                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 824                         int type;
 825
 826                         type = ELF64_R_TYPE(rel->r_info);
 827                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 828                         switch (type) {
 829                         case R_ALPHA_GPDISP:
 830                             /* The gp is just 32 bit, and never changes, so it's easiest to emit it
 831                                as an immediate instead of constructing it from the pv or ra.  */
 832                             fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, gp);\n",
 833                                     rel->r_offset - start_offset);
 834                             fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, gp);\n",
 835                                     rel->r_offset - start_offset + rel->r_addend);
 836                             break;
 837                         case R_ALPHA_LITUSE:
 838                             /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
 839                                now, since some called functions (libc) need pv to be set up.  */
 840                             break;
 841                         case R_ALPHA_HINT:
 842                             /* Branch target prediction hint. Ignore for now.  Should be already
 843                                correct for in-function jumps.  */
 844                             break;
 845                         case R_ALPHA_LITERAL:
 846                             /* Load a literal from the GOT relative to the gp.  Since there's only a
 847                                single gp, nothing is to be done.  */
 848                             break;
 849                         case R_ALPHA_GPRELHIGH:
 850                             /* Handle fake relocations against __op_param symbol.  Need to emit the
 851                                high part of the immediate value instead.  Other symbols need no
 852                                special treatment.  */
 853                             if (strstart(sym_name, "__op_param", &p))
 854                                 fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, param%s);\n",
 855                                         rel->r_offset - start_offset, p);
 856                             break;
 857                         case R_ALPHA_GPRELLOW:
 858                             if (strstart(sym_name, "__op_param", &p))
 859                                 fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, param%s);\n",
 860                                         rel->r_offset - start_offset, p);
 861                             break;
 862                         case R_ALPHA_BRSGP:
 863                             /* PC-relative jump. Tweak offset to skip the two instructions that try to
 864                                set up the gp from the pv.  */
 865                             fprintf(outfile, "    fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
 866                                     rel->r_offset - start_offset, sym_name, rel->r_offset - start_offset);
 867                             break;
 868                         default:
 869                             error("unsupported Alpha relocation (%d)", type);
 870                         }
 871                     }
 872                 }
 873             }
 874 #elif defined(HOST_IA64)
 875             {
 876                 char name[256];
 877                 int type;
 878                 int addend;
 879                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 880                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 881                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 882                         if (strstart(sym_name, "__op_param", &p)) {
 883                             snprintf(name, sizeof(name), "param%s", p);
 884                         } else {
 885                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 886                         }
 887                         type = ELF64_R_TYPE(rel->r_info);
 888                         addend = rel->r_addend;
 889                         switch(type) {
 890                         case R_IA64_LTOFF22:
 891                             error("must implemnt R_IA64_LTOFF22 relocation");
 892                         case R_IA64_PCREL21B:
 893                             error("must implemnt R_IA64_PCREL21B relocation");
 894                         default:
 895                             error("unsupported ia64 relocation (%d)", type);
 896                         }
 897                     }
 898                 }
 899             }
 900 #elif defined(HOST_SPARC)
 901             {
 902                 char name[256];
 903                 int type;
 904                 int addend;
 905                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 906                     if (rel->r_offset >= start_offset &&
 907                         rel->r_offset < start_offset + copy_size) {
 908                         sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 909                         if (strstart(sym_name, "__op_param", &p)) {
 910                             snprintf(name, sizeof(name), "param%s", p);
 911                         } else {
 912                                 if (sym_name[0] == '.')
 913                                         snprintf(name, sizeof(name),
 914                                                  "(long)(&__dot_%s)",
 915                                                  sym_name + 1);
 916                                 else
 917                                         snprintf(name, sizeof(name),
 918                                                  "(long)(&%s)", sym_name);
 919                         }
 920                         type = ELF32_R_TYPE(rel->r_info);
 921                         addend = rel->r_addend;
 922                         switch(type) {
 923                         case R_SPARC_32:
 924                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 925                                     rel->r_offset - start_offset, name, addend);
 926                             break;
 927                         case R_SPARC_HI22:
 928                             fprintf(outfile,
 929                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 930                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 931                                     " & ~0x3fffff) "
 932                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
 933                                     rel->r_offset - start_offset,
 934                                     rel->r_offset - start_offset,
 935                                     name, addend);
 936                             break;
 937                         case R_SPARC_LO10:
 938                             fprintf(outfile,
 939                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 940                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 941                                     " & ~0x3ff) "
 942                                     " | ((%s + %d) & 0x3ff);\n",
 943                                     rel->r_offset - start_offset,
 944                                     rel->r_offset - start_offset,
 945                                     name, addend);
 946                             break;
 947                         case R_SPARC_WDISP30:
 948                             fprintf(outfile,
 949                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 950                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 951                                     " & ~0x3fffffff) "
 952                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
 953                                     "    & 0x3fffffff);\n",
 954                                     rel->r_offset - start_offset,
 955                                     rel->r_offset - start_offset,
 956                                     name, addend,
 957                                     rel->r_offset - start_offset);
 958                             break;
 959                         default:
 960                             error("unsupported sparc relocation (%d)", type);
 961                         }
 962                     }
 963                 }
 964             }
 965 #elif defined(HOST_SPARC64)
 966             {
 967                 char name[256];
 968                 int type;
 969                 int addend;
 970                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 971                     if (rel->r_offset >= start_offset &&
 972                         rel->r_offset < start_offset + copy_size) {
 973                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 974                         if (strstart(sym_name, "__op_param", &p)) {
 975                             snprintf(name, sizeof(name), "param%s", p);
 976                         } else {
 977                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 978                         }
 979                         type = ELF64_R_TYPE(rel->r_info);
 980                         addend = rel->r_addend;
 981                         switch(type) {
 982                         case R_SPARC_32:
 983                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 984                                     rel->r_offset - start_offset, name, addend);
 985                             break;
 986                         case R_SPARC_HI22:
 987                             fprintf(outfile,
 988                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 989                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 990                                     " & ~0x3fffff) "
 991                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
 992                                     rel->r_offset - start_offset,
 993                                     rel->r_offset - start_offset,
 994                                     name, addend);
 995                             break;
 996                         case R_SPARC_LO10:
 997                             fprintf(outfile,
 998                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 999                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1000                                     " & ~0x3ff) "
1001                                     " | ((%s + %d) & 0x3ff);\n",
1002                                     rel->r_offset - start_offset,
1003                                     rel->r_offset - start_offset,
1004                                     name, addend);
1005                             break;
1006                         case R_SPARC_WDISP30:
1007                             fprintf(outfile,
1008                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1009                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1010                                     " & ~0x3fffffff) "
1011                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
1012                                     "    & 0x3fffffff);\n",
1013                                     rel->r_offset - start_offset,
1014                                     rel->r_offset - start_offset,
1015                                     name, addend,
1016                                     rel->r_offset - start_offset);
1017                             break;
1018                         default:
1019                             error("unsupported sparc64 relocation (%d)", type);
1020                         }
1021                     }
1022                 }
1023             }
1024 #elif defined(HOST_ARM)
1025             {
1026                 char name[256];
1027                 int type;
1028                 int addend;
1029
1030                 arm_emit_ldr_info(name, start_offset, outfile, p_start, p_end,
1031                                   relocs, nb_relocs);
1032
1033                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1034                 if (rel->r_offset >= start_offset &&
1035                     rel->r_offset < start_offset + copy_size) {
1036                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
1037                     /* the compiler leave some unnecessary references to the code */
1038                     if (sym_name[0] == '\0')
1039                         continue;
1040                     if (strstart(sym_name, "__op_param", &p)) {
1041                         snprintf(name, sizeof(name), "param%s", p);
1042                     } else {
1043                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1044                     }
1045                     type = ELF32_R_TYPE(rel->r_info);
1046                     addend = get32((uint32_t *)(text + rel->r_offset));
1047                     switch(type) {
1048                     case R_ARM_ABS32:
1049                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1050                                 rel->r_offset - start_offset, name, addend);
1051                         break;
1052                     case R_ARM_PC24:
1053                         fprintf(outfile, "    arm_reloc_pc24((uint32_t *)(gen_code_ptr + %d), 0x%x, %s);\n",
1054                                 rel->r_offset - start_offset, addend, name);
1055                         break;
1056                     default:
1057                         error("unsupported arm relocation (%d)", type);
1058                     }
1059                 }
1060                 }
1061             }
1062 #else
1063 #error unsupported CPU
1064 #endif
1065         fprintf(outfile, "    gen_code_ptr += %d;\n", copy_size);
1066         fprintf(outfile, "}\n");
1067         fprintf(outfile, "break;\n\n");
1068     } else {
1069         fprintf(outfile, "static inline void gen_%s(", name);
1070         if (nb_args == 0) {
1071             fprintf(outfile, "void");
1072         } else {
1073             for(i = 0; i < nb_args; i++) {
1074                 if (i != 0)
1075                     fprintf(outfile, ", ");
1076                 fprintf(outfile, "long param%d", i + 1);
1077             }
1078         }
1079         fprintf(outfile, ")\n");
1080         fprintf(outfile, "{\n");
1081         for(i = 0; i < nb_args; i++) {
1082             fprintf(outfile, "    *gen_opparam_ptr++ = param%d;\n", i + 1);
1083         }
1084         fprintf(outfile, "    *gen_opc_ptr++ = INDEX_%s;\n", name);
1085         fprintf(outfile, "}\n\n");
1086     }
1087 }
1088
1089 /* load an elf object file */
1090 int load_elf(const char *filename, FILE *outfile, int do_print_enum)
1091 {
1092     int fd;
1093     struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec;
1094     int i, j;
1095     ElfW(Sym) *sym;
1096     char *shstr;
1097     uint8_t *text;
1098     ELF_RELOC *relocs;
1099     int nb_relocs;
1100     ELF_RELOC *rel;
1101
1102     fd = open(filename, O_RDONLY);
1103     if (fd < 0)
1104         error("can't open file '%s'", filename);
1105
1106     /* Read ELF header.  */
1107     if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
1108         error("unable to read file header");
1109
1110     /* Check ELF identification.  */
1111     if (ehdr.e_ident[EI_MAG0] != ELFMAG0
1112      || ehdr.e_ident[EI_MAG1] != ELFMAG1
1113      || ehdr.e_ident[EI_MAG2] != ELFMAG2
1114      || ehdr.e_ident[EI_MAG3] != ELFMAG3
1115      || ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
1116         error("bad ELF header");
1117     }
1118
1119     do_swap = elf_must_swap(&ehdr);
1120     if (do_swap)
1121         elf_swap_ehdr(&ehdr);
1122     if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
1123         error("Unsupported ELF class");
1124     if (ehdr.e_type != ET_REL)
1125         error("ELF object file expected");
1126     if (ehdr.e_version != EV_CURRENT)
1127         error("Invalid ELF version");
1128     if (!elf_check_arch(ehdr.e_machine))
1129         error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
1130
1131     /* read section headers */
1132     shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr));
1133     if (do_swap) {
1134         for(i = 0; i < ehdr.e_shnum; i++) {
1135             elf_swap_shdr(&shdr[i]);
1136         }
1137     }
1138
1139     /* read all section data */
1140     sdata = malloc(sizeof(void *) * ehdr.e_shnum);
1141     memset(sdata, 0, sizeof(void *) * ehdr.e_shnum);
1142
1143     for(i = 0;i < ehdr.e_shnum; i++) {
1144         sec = &shdr[i];
1145         if (sec->sh_type != SHT_NOBITS)
1146             sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size);
1147     }
1148
1149     sec = &shdr[ehdr.e_shstrndx];
1150     shstr = sdata[ehdr.e_shstrndx];
1151
1152     /* swap relocations */
1153     for(i = 0; i < ehdr.e_shnum; i++) {
1154         sec = &shdr[i];
1155         if (sec->sh_type == SHT_RELOC) {
1156             nb_relocs = sec->sh_size / sec->sh_entsize;
1157             if (do_swap) {
1158                 for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++)
1159                     elf_swap_rel(rel);
1160             }
1161         }
1162     }
1163     /* text section */
1164
1165     text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
1166     if (!text_sec)
1167         error("could not find .text section");
1168     text_shndx = text_sec - shdr;
1169     text = sdata[text_shndx];
1170
1171     /* find text relocations, if any */
1172     relocs = NULL;
1173     nb_relocs = 0;
1174     i = find_reloc(text_shndx);
1175     if (i != 0) {
1176         relocs = (ELF_RELOC *)sdata[i];
1177         nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize;
1178     }
1179
1180     symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
1181     if (!symtab_sec)
1182         error("could not find .symtab section");
1183     strtab_sec = &shdr[symtab_sec->sh_link];
1184
1185     symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr];
1186     strtab = sdata[symtab_sec->sh_link];
1187
1188     nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
1189     if (do_swap) {
1190         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1191             swab32s(&sym->st_name);
1192             swabls(&sym->st_value);
1193             swabls(&sym->st_size);
1194             swab16s(&sym->st_shndx);
1195         }
1196     }
1197
1198     if (do_print_enum) {
1199         fprintf(outfile, "DEF(end, 0, 0)\n");
1200         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1201             const char *name, *p;
1202             name = strtab + sym->st_name;
1203             if (strstart(name, OP_PREFIX, &p)) {
1204                 gen_code(name, sym->st_value, sym->st_size, outfile,
1205                          text, relocs, nb_relocs, 2);
1206             }
1207         }
1208     } else {
1209         /* generate big code generation switch */
1210 fprintf(outfile,
1211 "int dyngen_code(uint8_t *gen_code_buf,\n"
1212 "                uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
1213 "                const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
1214 "{\n"
1215 "    uint8_t *gen_code_ptr;\n"
1216 "    const uint16_t *opc_ptr;\n"
1217 "    const uint32_t *opparam_ptr;\n");
1218
1219 #ifdef HOST_ARM
1220 fprintf(outfile,
1221 "    uint8_t *last_gen_code_ptr = gen_code_buf;\n"
1222 "    LDREntry *arm_ldr_ptr = arm_ldr_table;\n"
1223 "    uint32_t *arm_data_ptr = arm_data_table;\n");
1224 #endif
1225
1226 fprintf(outfile,
1227 "\n"
1228 "    gen_code_ptr = gen_code_buf;\n"
1229 "    opc_ptr = opc_buf;\n"
1230 "    opparam_ptr = opparam_buf;\n");
1231
1232         /* Generate prologue, if needed. */
1233
1234 fprintf(outfile,
1235 "    for(;;) {\n"
1236 "        switch(*opc_ptr++) {\n"
1237 );
1238
1239         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1240             const char *name;
1241             name = strtab + sym->st_name;
1242             if (strstart(name, OP_PREFIX, NULL)) {
1243 #if 0
1244                 printf("%4d: %s pos=0x%08x len=%d\n",
1245                        i, name, sym->st_value, sym->st_size);
1246 #endif
1247                 if (sym->st_shndx != (text_sec - shdr))
1248                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1249                 gen_code(name, sym->st_value, sym->st_size, outfile,
1250                          text, relocs, nb_relocs, 1);
1251             }
1252         }
1253
1254 fprintf(outfile,
1255 "        default:\n"
1256 "            goto the_end;\n"
1257 "        }\n");
1258
1259 #ifdef HOST_ARM
1260 /* generate constant table if needed */
1261 fprintf(outfile,
1262 "        if ((gen_code_ptr - last_gen_code_ptr) >= (MAX_FRAG_SIZE - MAX_OP_SIZE)) {\n"
1263 "            gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 1);\n"
1264 "            last_gen_code_ptr = gen_code_ptr;\n"
1265 "            arm_ldr_ptr = arm_ldr_table;\n"
1266 "            arm_data_ptr = arm_data_table;\n"
1267 "        }\n");
1268 #endif
1269
1270
1271 fprintf(outfile,
1272 "    }\n"
1273 " the_end:\n"
1274 );
1275
1276 /* generate epilogue */
1277     switch(ELF_ARCH) {
1278     case EM_386:
1279         fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
1280         break;
1281     case EM_PPC:
1282         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
1283         break;
1284     case EM_S390:
1285         fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
1286         break;
1287     case EM_ALPHA:
1288         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
1289         break;
1290     case EM_IA_64:
1291         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
1292         break;
1293     case EM_SPARC:
1294     case EM_SPARC32PLUS:
1295         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c62008; /* jmpl %%i0 + 8, %%g0 */\n");
1296         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x01000000; /* nop */\n");
1297         break;
1298     case EM_SPARCV9:
1299         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c7e008; /* ret */\n");
1300         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81e80000; /* restore */\n");
1301         break;
1302     case EM_ARM:
1303         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");
1304         break;
1305     default:
1306         error("unknown ELF architecture");
1307     }
1308
1309     fprintf(outfile, "return gen_code_ptr -  gen_code_buf;\n");
1310     fprintf(outfile, "}\n\n");
1311
1312 /* generate gen_xxx functions */
1313 /* XXX: suppress the use of these functions to simplify code */
1314         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1315             const char *name;
1316             name = strtab + sym->st_name;
1317             if (strstart(name, OP_PREFIX, NULL)) {
1318                 if (sym->st_shndx != (text_sec - shdr))
1319                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1320                 gen_code(name, sym->st_value, sym->st_size, outfile,
1321                          text, relocs, nb_relocs, 0);
1322             }
1323         }
1324     }
1325
1326     close(fd);
1327     return 0;
1328 }
1329
1330 void usage(void)
1331 {
1332     printf("dyngen (c) 2003 Fabrice Bellard\n"
1333            "usage: dyngen [-o outfile] [-c] objfile\n"
1334            "Generate a dynamic code generator from an object file\n"
1335            "-c     output enum of operations\n"
1336            );
1337     exit(1);
1338 }
1339
1340 int main(int argc, char **argv)
1341 {
1342     int c, do_print_enum;
1343     const char *filename, *outfilename;
1344     FILE *outfile;
1345
1346     outfilename = "out.c";
1347     do_print_enum = 0;
1348     for(;;) {
1349         c = getopt(argc, argv, "ho:c");
1350         if (c == -1)
1351             break;
1352         switch(c) {
1353         case 'h':
1354             usage();
1355             break;
1356         case 'o':
1357             outfilename = optarg;
1358             break;
1359         case 'c':
1360             do_print_enum = 1;
1361             break;
1362         }
1363     }
1364     if (optind >= argc)
1365         usage();
1366     filename = argv[optind];
1367     outfile = fopen(outfilename, "w");
1368     if (!outfile)
1369         error("could not open '%s'", outfilename);
1370     load_elf(filename, outfile, do_print_enum);
1371     fclose(outfile);
1372     return 0;
1373 }