dyngen.c

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