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