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 (p == p_start)
 489                 error("empty code for %s", name);
 490             if (get32((uint32_t *)p) != 0x6bfa8001)
 491                 error("ret expected at the end of %s", name);
 492             copy_size = p - p_start;
 493         }
 494         break;
 495     case EM_IA_64:
 496         {
 497             uint8_t *p;
 498             p = (void *)(p_end - 4);
 499             if (p == p_start)
 500                 error("empty code for %s", name);
 501             /* br.ret.sptk.many b0;; */
 502             /* 08 00 84 00 */
 503             if (get32((uint32_t *)p) != 0x00840008)
 504                 error("br.ret.sptk.many b0;; expected at the end of %s", name);
 505             copy_size = p - p_start;
 506         }
 507         break;
 508     case EM_SPARC:
 509     case EM_SPARC32PLUS:
 510         {
 511             uint32_t start_insn, end_insn1, end_insn2;
 512             uint8_t *p;
 513             p = (void *)(p_end - 8);
 514             if (p <= p_start)
 515                 error("empty code for %s", name);
 516             start_insn = get32((uint32_t *)(p_start + 0x0));
 517             end_insn1 = get32((uint32_t *)(p + 0x0));
 518             end_insn2 = get32((uint32_t *)(p + 0x4));
 519             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 520                 p_start += 0x4;
 521                 start_offset += 0x4;
 522                 if ((int)(start_insn | ~0x1fff) < -128)
 523                     error("Found bogus save at the start of %s", name);
 524                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 525                     error("ret; restore; not found at end of %s", name);
 526             } else {
 527                 error("No save at the beginning of %s", name);
 528             }
 529 #if 0
 530             /* Skip a preceeding nop, if present.  */
 531             if (p > p_start) {
 532                 skip_insn = get32((uint32_t *)(p - 0x4));
 533                 if (skip_insn == 0x01000000)
 534                     p -= 4;
 535             }
 536 #endif
 537             copy_size = p - p_start;
 538         }
 539         break;
 540     case EM_SPARCV9:
 541         {
 542             uint32_t start_insn, end_insn1, end_insn2, skip_insn;
 543             uint8_t *p;
 544             p = (void *)(p_end - 8);
 545             if (p <= p_start)
 546                 error("empty code for %s", name);
 547             start_insn = get32((uint32_t *)(p_start + 0x0));
 548             end_insn1 = get32((uint32_t *)(p + 0x0));
 549             end_insn2 = get32((uint32_t *)(p + 0x4));
 550             if ((start_insn & ~0x1fff) == 0x9de3a000) {
 551                 p_start += 0x4;
 552                 start_offset += 0x4;
 553                 if ((int)(start_insn | ~0x1fff) < -256)
 554                     error("Found bogus save at the start of %s", name);
 555                 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
 556                     error("ret; restore; not found at end of %s", name);
 557             } else {
 558                 error("No save at the beginning of %s", name);
 559             }
 560
 561             /* Skip a preceeding nop, if present.  */
 562             if (p > p_start) {
 563                 skip_insn = get32((uint32_t *)(p - 0x4));
 564                 if (skip_insn == 0x01000000)
 565                     p -= 4;
 566             }
 567
 568             copy_size = p - p_start;
 569         }
 570         break;
 571 #ifdef HOST_ARM
 572     case EM_ARM:
 573         if ((p_end - p_start) <= 16)
 574             error("%s: function too small", name);
 575         if (get32((uint32_t *)p_start) != 0xe1a0c00d ||
 576             (get32((uint32_t *)(p_start + 4)) & 0xffff0000) != 0xe92d0000 ||
 577             get32((uint32_t *)(p_start + 8)) != 0xe24cb004)
 578             error("%s: invalid prolog", name);
 579         p_start += 12;
 580         start_offset += 12;
 581         copy_size = arm_emit_ldr_info(name, start_offset, NULL, p_start, p_end,
 582                                       relocs, nb_relocs);
 583         break;
 584 #endif
 585     case EM_68K:
 586         {
 587             uint8_t *p;
 588             p = (void *)(p_end - 2);
 589             if (p == p_start)
 590                 error("empty code for %s", name);
 591             // remove NOP's, probably added for alignment
 592             while ((get16((uint16_t *)p) == 0x4e71) &&
 593                    (p>p_start))
 594               p -= 2;
 595             if (get16((uint16_t *)p) != 0x4e75)
 596                 error("rts expected at the end of %s", name);
 597             copy_size = p - p_start;
 598         }
 599         break;
 600     default:
 601         error("unknown ELF architecture");
 602     }
 603
 604     /* compute the number of arguments by looking at the relocations */
 605     for(i = 0;i < MAX_ARGS; i++)
 606         args_present[i] = 0;
 607
 608     for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 609         if (rel->r_offset >= start_offset &&
 610             rel->r_offset < start_offset + (p_end - p_start)) {
 611             sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 612             if (strstart(sym_name, "__op_param", &p)) {
 613                 n = strtoul(p, NULL, 10);
 614                 if (n > MAX_ARGS)
 615                     error("too many arguments in %s", name);
 616                 args_present[n - 1] = 1;
 617             }
 618         }
 619     }
 620
 621     nb_args = 0;
 622     while (nb_args < MAX_ARGS && args_present[nb_args])
 623         nb_args++;
 624     for(i = nb_args; i < MAX_ARGS; i++) {
 625         if (args_present[i])
 626             error("inconsistent argument numbering in %s", name);
 627     }
 628
 629     if (gen_switch == 2) {
 630         fprintf(outfile, "DEF(%s, %d, %d)\n", name + 3, nb_args, copy_size);
 631     } else if (gen_switch == 1) {
 632
 633         /* output C code */
 634         fprintf(outfile, "case INDEX_%s: {\n", name);
 635         if (nb_args > 0) {
 636             fprintf(outfile, "    long ");
 637             for(i = 0; i < nb_args; i++) {
 638                 if (i != 0)
 639                     fprintf(outfile, ", ");
 640                 fprintf(outfile, "param%d", i + 1);
 641             }
 642             fprintf(outfile, ";\n");
 643         }
 644         fprintf(outfile, "    extern void %s();\n", name);
 645
 646         for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 647             if (rel->r_offset >= start_offset &&
 648                 rel->r_offset < start_offset + (p_end - p_start)) {
 649                 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 650                 if (*sym_name &&
 651                     !strstart(sym_name, "__op_param", NULL) &&
 652                     !strstart(sym_name, "__op_jmp", NULL)) {
 653 #if defined(HOST_SPARC)
 654                     if (sym_name[0] == '.') {
 655                         fprintf(outfile,
 656                                 "extern char __dot_%s __asm__(\"%s\");\n",
 657                                 sym_name+1, sym_name);
 658                         continue;
 659                     }
 660 #endif
 661                     fprintf(outfile, "extern char %s;\n", sym_name);
 662                 }
 663             }
 664         }
 665
 666         fprintf(outfile, "    memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name, start_offset - offset, copy_size);
 667
 668         /* emit code offset information */
 669         {
 670             ElfW(Sym) *sym;
 671             const char *sym_name, *p;
 672             unsigned long val;
 673             int n;
 674
 675             for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
 676                 sym_name = strtab + sym->st_name;
 677                 if (strstart(sym_name, "__op_label", &p)) {
 678                     uint8_t *ptr;
 679                     unsigned long offset;
 680
 681                     /* test if the variable refers to a label inside
 682                        the code we are generating */
 683                     ptr = sdata[sym->st_shndx];
 684                     if (!ptr)
 685                         error("__op_labelN in invalid section");
 686                     offset = sym->st_value;
 687                     val = *(unsigned long *)(ptr + offset);
 688 #ifdef ELF_USES_RELOCA
 689                     {
 690                         int reloc_shndx, nb_relocs1, j;
 691
 692                         /* try to find a matching relocation */
 693                         reloc_shndx = find_reloc(sym->st_shndx);
 694                         if (reloc_shndx) {
 695                             nb_relocs1 = shdr[reloc_shndx].sh_size /
 696                                 shdr[reloc_shndx].sh_entsize;
 697                             rel = (ELF_RELOC *)sdata[reloc_shndx];
 698                             for(j = 0; j < nb_relocs1; j++) {
 699                                 if (rel->r_offset == offset) {
 700                                     val = rel->r_addend;
 701                                     break;
 702                                 }
 703                                 rel++;
 704                             }
 705                         }
 706                     }
 707 #endif
 708
 709                     if (val >= start_offset && val < start_offset + copy_size) {
 710                         n = strtol(p, NULL, 10);
 711                         fprintf(outfile, "    label_offsets[%d] = %ld + (gen_code_ptr - gen_code_buf);\n", n, val - start_offset);
 712                     }
 713                 }
 714             }
 715         }
 716
 717         /* load parameres in variables */
 718         for(i = 0; i < nb_args; i++) {
 719             fprintf(outfile, "    param%d = *opparam_ptr++;\n", i + 1);
 720         }
 721
 722         /* patch relocations */
 723 #if defined(HOST_I386)
 724             {
 725                 char name[256];
 726                 int type;
 727                 int addend;
 728                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 729                 if (rel->r_offset >= start_offset &&
 730                     rel->r_offset < start_offset + copy_size) {
 731                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 732                     if (strstart(sym_name, "__op_param", &p)) {
 733                         snprintf(name, sizeof(name), "param%s", p);
 734                     } else {
 735                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 736                     }
 737                     type = ELF32_R_TYPE(rel->r_info);
 738                     addend = get32((uint32_t *)(text + rel->r_offset));
 739                     switch(type) {
 740                     case R_386_32:
 741                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 742                                 rel->r_offset - start_offset, name, addend);
 743                         break;
 744                     case R_386_PC32:
 745                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
 746                                 rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 747                         break;
 748                     default:
 749                         error("unsupported i386 relocation (%d)", type);
 750                     }
 751                 }
 752                 }
 753             }
 754 #elif defined(HOST_PPC)
 755             {
 756                 char name[256];
 757                 int type;
 758                 int addend;
 759                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 760                     if (rel->r_offset >= start_offset &&
 761                         rel->r_offset < start_offset + copy_size) {
 762                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 763                         if (strstart(sym_name, "__op_jmp", &p)) {
 764                             int n;
 765                             n = strtol(p, NULL, 10);
 766                             /* __op_jmp relocations are done at
 767                                runtime to do translated block
 768                                chaining: the offset of the instruction
 769                                needs to be stored */
 770                             fprintf(outfile, "    jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
 771                                     n, rel->r_offset - start_offset);
 772                             continue;
 773                         }
 774
 775                         if (strstart(sym_name, "__op_param", &p)) {
 776                             snprintf(name, sizeof(name), "param%s", p);
 777                         } else {
 778                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 779                         }
 780                         type = ELF32_R_TYPE(rel->r_info);
 781                         addend = rel->r_addend;
 782                         switch(type) {
 783                         case R_PPC_ADDR32:
 784                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 785                                     rel->r_offset - start_offset, name, addend);
 786                             break;
 787                         case R_PPC_ADDR16_LO:
 788                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
 789                                     rel->r_offset - start_offset, name, addend);
 790                             break;
 791                         case R_PPC_ADDR16_HI:
 792                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
 793                                     rel->r_offset - start_offset, name, addend);
 794                             break;
 795                         case R_PPC_ADDR16_HA:
 796                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
 797                                     rel->r_offset - start_offset, name, addend);
 798                             break;
 799                         case R_PPC_REL24:
 800                             /* warning: must be at 32 MB distancy */
 801                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
 802                                     rel->r_offset - start_offset, rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
 803                             break;
 804                         default:
 805                             error("unsupported powerpc relocation (%d)", type);
 806                         }
 807                     }
 808                 }
 809             }
 810 #elif defined(HOST_S390)
 811             {
 812                 char name[256];
 813                 int type;
 814                 int addend;
 815                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 816                     if (rel->r_offset >= start_offset &&
 817                         rel->r_offset < start_offset + copy_size) {
 818                         sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
 819                         if (strstart(sym_name, "__op_param", &p)) {
 820                             snprintf(name, sizeof(name), "param%s", p);
 821                         } else {
 822                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 823                         }
 824                         type = ELF32_R_TYPE(rel->r_info);
 825                         addend = rel->r_addend;
 826                         switch(type) {
 827                         case R_390_32:
 828                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 829                                     rel->r_offset - start_offset, name, addend);
 830                             break;
 831                         case R_390_16:
 832                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
 833                                     rel->r_offset - start_offset, name, addend);
 834                             break;
 835                         case R_390_8:
 836                             fprintf(outfile, "    *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
 837                                     rel->r_offset - start_offset, name, addend);
 838                             break;
 839                         default:
 840                             error("unsupported s390 relocation (%d)", type);
 841                         }
 842                     }
 843                 }
 844             }
 845 #elif defined(HOST_ALPHA)
 846             {
 847                 for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) {
 848                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 849                         int type;
 850
 851                         type = ELF64_R_TYPE(rel->r_info);
 852                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 853                         switch (type) {
 854                         case R_ALPHA_GPDISP:
 855                             /* The gp is just 32 bit, and never changes, so it's easiest to emit it
 856                                as an immediate instead of constructing it from the pv or ra.  */
 857                             fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, gp);\n",
 858                                     rel->r_offset - start_offset);
 859                             fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, gp);\n",
 860                                     rel->r_offset - start_offset + rel->r_addend);
 861                             break;
 862                         case R_ALPHA_LITUSE:
 863                             /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
 864                                now, since some called functions (libc) need pv to be set up.  */
 865                             break;
 866                         case R_ALPHA_HINT:
 867                             /* Branch target prediction hint. Ignore for now.  Should be already
 868                                correct for in-function jumps.  */
 869                             break;
 870                         case R_ALPHA_LITERAL:
 871                             /* Load a literal from the GOT relative to the gp.  Since there's only a
 872                                single gp, nothing is to be done.  */
 873                             break;
 874                         case R_ALPHA_GPRELHIGH:
 875                             /* Handle fake relocations against __op_param symbol.  Need to emit the
 876                                high part of the immediate value instead.  Other symbols need no
 877                                special treatment.  */
 878                             if (strstart(sym_name, "__op_param", &p))
 879                                 fprintf(outfile, "    immediate_ldah(gen_code_ptr + %ld, param%s);\n",
 880                                         rel->r_offset - start_offset, p);
 881                             break;
 882                         case R_ALPHA_GPRELLOW:
 883                             if (strstart(sym_name, "__op_param", &p))
 884                                 fprintf(outfile, "    immediate_lda(gen_code_ptr + %ld, param%s);\n",
 885                                         rel->r_offset - start_offset, p);
 886                             break;
 887                         case R_ALPHA_BRSGP:
 888                             /* PC-relative jump. Tweak offset to skip the two instructions that try to
 889                                set up the gp from the pv.  */
 890                             fprintf(outfile, "    fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
 891                                     rel->r_offset - start_offset, sym_name, rel->r_offset - start_offset);
 892                             break;
 893                         default:
 894                             error("unsupported Alpha relocation (%d)", type);
 895                         }
 896                     }
 897                 }
 898             }
 899 #elif defined(HOST_IA64)
 900             {
 901                 char name[256];
 902                 int type;
 903                 int addend;
 904                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 905                     if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
 906                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 907                         if (strstart(sym_name, "__op_param", &p)) {
 908                             snprintf(name, sizeof(name), "param%s", p);
 909                         } else {
 910                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 911                         }
 912                         type = ELF64_R_TYPE(rel->r_info);
 913                         addend = rel->r_addend;
 914                         switch(type) {
 915                         case R_IA64_LTOFF22:
 916                             error("must implemnt R_IA64_LTOFF22 relocation");
 917                         case R_IA64_PCREL21B:
 918                             error("must implemnt R_IA64_PCREL21B relocation");
 919                         default:
 920                             error("unsupported ia64 relocation (%d)", type);
 921                         }
 922                     }
 923                 }
 924             }
 925 #elif defined(HOST_SPARC)
 926             {
 927                 char name[256];
 928                 int type;
 929                 int addend;
 930                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 931                     if (rel->r_offset >= start_offset &&
 932                         rel->r_offset < start_offset + copy_size) {
 933                         sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 934                         if (strstart(sym_name, "__op_param", &p)) {
 935                             snprintf(name, sizeof(name), "param%s", p);
 936                         } else {
 937                                 if (sym_name[0] == '.')
 938                                         snprintf(name, sizeof(name),
 939                                                  "(long)(&__dot_%s)",
 940                                                  sym_name + 1);
 941                                 else
 942                                         snprintf(name, sizeof(name),
 943                                                  "(long)(&%s)", sym_name);
 944                         }
 945                         type = ELF32_R_TYPE(rel->r_info);
 946                         addend = rel->r_addend;
 947                         switch(type) {
 948                         case R_SPARC_32:
 949                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
 950                                     rel->r_offset - start_offset, name, addend);
 951                             break;
 952                         case R_SPARC_HI22:
 953                             fprintf(outfile,
 954                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 955                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 956                                     " & ~0x3fffff) "
 957                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
 958                                     rel->r_offset - start_offset,
 959                                     rel->r_offset - start_offset,
 960                                     name, addend);
 961                             break;
 962                         case R_SPARC_LO10:
 963                             fprintf(outfile,
 964                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 965                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 966                                     " & ~0x3ff) "
 967                                     " | ((%s + %d) & 0x3ff);\n",
 968                                     rel->r_offset - start_offset,
 969                                     rel->r_offset - start_offset,
 970                                     name, addend);
 971                             break;
 972                         case R_SPARC_WDISP30:
 973                             fprintf(outfile,
 974                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
 975                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
 976                                     " & ~0x3fffffff) "
 977                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
 978                                     "    & 0x3fffffff);\n",
 979                                     rel->r_offset - start_offset,
 980                                     rel->r_offset - start_offset,
 981                                     name, addend,
 982                                     rel->r_offset - start_offset);
 983                             break;
 984                         default:
 985                             error("unsupported sparc relocation (%d)", type);
 986                         }
 987                     }
 988                 }
 989             }
 990 #elif defined(HOST_SPARC64)
 991             {
 992                 char name[256];
 993                 int type;
 994                 int addend;
 995                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 996                     if (rel->r_offset >= start_offset &&
 997                         rel->r_offset < start_offset + copy_size) {
 998                         sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
 999                         if (strstart(sym_name, "__op_param", &p)) {
1000                             snprintf(name, sizeof(name), "param%s", p);
1001                         } else {
1002                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1003                         }
1004                         type = ELF64_R_TYPE(rel->r_info);
1005                         addend = rel->r_addend;
1006                         switch(type) {
1007                         case R_SPARC_32:
1008                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1009                                     rel->r_offset - start_offset, name, addend);
1010                             break;
1011                         case R_SPARC_HI22:
1012                             fprintf(outfile,
1013                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1014                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1015                                     " & ~0x3fffff) "
1016                                     " | (((%s + %d) >> 10) & 0x3fffff);\n",
1017                                     rel->r_offset - start_offset,
1018                                     rel->r_offset - start_offset,
1019                                     name, addend);
1020                             break;
1021                         case R_SPARC_LO10:
1022                             fprintf(outfile,
1023                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1024                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1025                                     " & ~0x3ff) "
1026                                     " | ((%s + %d) & 0x3ff);\n",
1027                                     rel->r_offset - start_offset,
1028                                     rel->r_offset - start_offset,
1029                                     name, addend);
1030                             break;
1031                         case R_SPARC_WDISP30:
1032                             fprintf(outfile,
1033                                     "    *(uint32_t *)(gen_code_ptr + %d) = "
1034                                     "((*(uint32_t *)(gen_code_ptr + %d)) "
1035                                     " & ~0x3fffffff) "
1036                                     " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
1037                                     "    & 0x3fffffff);\n",
1038                                     rel->r_offset - start_offset,
1039                                     rel->r_offset - start_offset,
1040                                     name, addend,
1041                                     rel->r_offset - start_offset);
1042                             break;
1043                         default:
1044                             error("unsupported sparc64 relocation (%d)", type);
1045                         }
1046                     }
1047                 }
1048             }
1049 #elif defined(HOST_ARM)
1050             {
1051                 char name[256];
1052                 int type;
1053                 int addend;
1054
1055                 arm_emit_ldr_info(name, start_offset, outfile, p_start, p_end,
1056                                   relocs, nb_relocs);
1057
1058                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1059                 if (rel->r_offset >= start_offset &&
1060                     rel->r_offset < start_offset + copy_size) {
1061                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
1062                     /* the compiler leave some unnecessary references to the code */
1063                     if (sym_name[0] == '\0')
1064                         continue;
1065                     if (strstart(sym_name, "__op_param", &p)) {
1066                         snprintf(name, sizeof(name), "param%s", p);
1067                     } else {
1068                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1069                     }
1070                     type = ELF32_R_TYPE(rel->r_info);
1071                     addend = get32((uint32_t *)(text + rel->r_offset));
1072                     switch(type) {
1073                     case R_ARM_ABS32:
1074                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1075                                 rel->r_offset - start_offset, name, addend);
1076                         break;
1077                     case R_ARM_PC24:
1078                         fprintf(outfile, "    arm_reloc_pc24((uint32_t *)(gen_code_ptr + %d), 0x%x, %s);\n",
1079                                 rel->r_offset - start_offset, addend, name);
1080                         break;
1081                     default:
1082                         error("unsupported arm relocation (%d)", type);
1083                     }
1084                 }
1085                 }
1086             }
1087 #elif defined(HOST_M68K)
1088             {
1089                 char name[256];
1090                 int type;
1091                 int addend;
1092                 Elf32_Sym *sym;
1093                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1094                 if (rel->r_offset >= start_offset &&
1095                     rel->r_offset < start_offset + copy_size) {
1096                     sym = &(symtab[ELFW(R_SYM)(rel->r_info)]);
1097                     sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
1098                     if (strstart(sym_name, "__op_param", &p)) {
1099                         snprintf(name, sizeof(name), "param%s", p);
1100                     } else {
1101                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1102                     }
1103                     type = ELF32_R_TYPE(rel->r_info);
1104                     addend = get32((uint32_t *)(text + rel->r_offset)) + rel->r_addend;
1105                     switch(type) {
1106                     case R_68K_32:
1107                         fprintf(outfile, "    /* R_68K_32 RELOC, offset %x */\n", rel->r_offset) ;
1108                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s + %#x;\n",
1109                                 rel->r_offset - start_offset, name, addend );
1110                         break;
1111                     case R_68K_PC32:
1112                         fprintf(outfile, "    /* R_68K_PC32 RELOC, offset %x */\n", rel->r_offset);
1113                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %#x) + %#x;\n",
1114                                 rel->r_offset - start_offset, name, rel->r_offset - start_offset, /*sym->st_value+*/ addend);
1115                         break;
1116                     default:
1117                         error("unsupported m68k relocation (%d)", type);
1118                     }
1119                 }
1120                 }
1121             }
1122 #else
1123 #error unsupported CPU
1124 #endif
1125         fprintf(outfile, "    gen_code_ptr += %d;\n", copy_size);
1126         fprintf(outfile, "}\n");
1127         fprintf(outfile, "break;\n\n");
1128     } else {
1129         fprintf(outfile, "static inline void gen_%s(", name);
1130         if (nb_args == 0) {
1131             fprintf(outfile, "void");
1132         } else {
1133             for(i = 0; i < nb_args; i++) {
1134                 if (i != 0)
1135                     fprintf(outfile, ", ");
1136                 fprintf(outfile, "long param%d", i + 1);
1137             }
1138         }
1139         fprintf(outfile, ")\n");
1140         fprintf(outfile, "{\n");
1141         for(i = 0; i < nb_args; i++) {
1142             fprintf(outfile, "    *gen_opparam_ptr++ = param%d;\n", i + 1);
1143         }
1144         fprintf(outfile, "    *gen_opc_ptr++ = INDEX_%s;\n", name);
1145         fprintf(outfile, "}\n\n");
1146     }
1147 }
1148
1149 /* load an elf object file */
1150 int load_elf(const char *filename, FILE *outfile, int out_type)
1151 {
1152     int fd;
1153     struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec;
1154     int i, j;
1155     ElfW(Sym) *sym;
1156     char *shstr;
1157     uint8_t *text;
1158     ELF_RELOC *relocs;
1159     int nb_relocs;
1160     ELF_RELOC *rel;
1161
1162     fd = open(filename, O_RDONLY);
1163     if (fd < 0)
1164         error("can't open file '%s'", filename);
1165
1166     /* Read ELF header.  */
1167     if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
1168         error("unable to read file header");
1169
1170     /* Check ELF identification.  */
1171     if (ehdr.e_ident[EI_MAG0] != ELFMAG0
1172      || ehdr.e_ident[EI_MAG1] != ELFMAG1
1173      || ehdr.e_ident[EI_MAG2] != ELFMAG2
1174      || ehdr.e_ident[EI_MAG3] != ELFMAG3
1175      || ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
1176         error("bad ELF header");
1177     }
1178
1179     do_swap = elf_must_swap(&ehdr);
1180     if (do_swap)
1181         elf_swap_ehdr(&ehdr);
1182     if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
1183         error("Unsupported ELF class");
1184     if (ehdr.e_type != ET_REL)
1185         error("ELF object file expected");
1186     if (ehdr.e_version != EV_CURRENT)
1187         error("Invalid ELF version");
1188     if (!elf_check_arch(ehdr.e_machine))
1189         error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
1190
1191     /* read section headers */
1192     shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr));
1193     if (do_swap) {
1194         for(i = 0; i < ehdr.e_shnum; i++) {
1195             elf_swap_shdr(&shdr[i]);
1196         }
1197     }
1198
1199     /* read all section data */
1200     sdata = malloc(sizeof(void *) * ehdr.e_shnum);
1201     memset(sdata, 0, sizeof(void *) * ehdr.e_shnum);
1202
1203     for(i = 0;i < ehdr.e_shnum; i++) {
1204         sec = &shdr[i];
1205         if (sec->sh_type != SHT_NOBITS)
1206             sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size);
1207     }
1208
1209     sec = &shdr[ehdr.e_shstrndx];
1210     shstr = sdata[ehdr.e_shstrndx];
1211
1212     /* swap relocations */
1213     for(i = 0; i < ehdr.e_shnum; i++) {
1214         sec = &shdr[i];
1215         if (sec->sh_type == SHT_RELOC) {
1216             nb_relocs = sec->sh_size / sec->sh_entsize;
1217             if (do_swap) {
1218                 for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++)
1219                     elf_swap_rel(rel);
1220             }
1221         }
1222     }
1223     /* text section */
1224
1225     text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
1226     if (!text_sec)
1227         error("could not find .text section");
1228     text_shndx = text_sec - shdr;
1229     text = sdata[text_shndx];
1230
1231     /* find text relocations, if any */
1232     relocs = NULL;
1233     nb_relocs = 0;
1234     i = find_reloc(text_shndx);
1235     if (i != 0) {
1236         relocs = (ELF_RELOC *)sdata[i];
1237         nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize;
1238     }
1239
1240     symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
1241     if (!symtab_sec)
1242         error("could not find .symtab section");
1243     strtab_sec = &shdr[symtab_sec->sh_link];
1244
1245     symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr];
1246     strtab = sdata[symtab_sec->sh_link];
1247
1248     nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
1249     if (do_swap) {
1250         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1251             swab32s(&sym->st_name);
1252             swabls(&sym->st_value);
1253             swabls(&sym->st_size);
1254             swab16s(&sym->st_shndx);
1255         }
1256     }
1257
1258     if (out_type == OUT_INDEX_OP) {
1259         fprintf(outfile, "DEF(end, 0, 0)\n");
1260         fprintf(outfile, "DEF(nop, 0, 0)\n");
1261         fprintf(outfile, "DEF(nop1, 1, 0)\n");
1262         fprintf(outfile, "DEF(nop2, 2, 0)\n");
1263         fprintf(outfile, "DEF(nop3, 3, 0)\n");
1264         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1265             const char *name, *p;
1266             name = strtab + sym->st_name;
1267             if (strstart(name, OP_PREFIX, &p)) {
1268                 gen_code(name, sym->st_value, sym->st_size, outfile,
1269                          text, relocs, nb_relocs, 2);
1270             }
1271         }
1272     } else if (out_type == OUT_GEN_OP) {
1273         /* generate gen_xxx functions */
1274
1275         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1276             const char *name;
1277             name = strtab + sym->st_name;
1278             if (strstart(name, OP_PREFIX, NULL)) {
1279                 if (sym->st_shndx != (text_sec - shdr))
1280                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1281                 gen_code(name, sym->st_value, sym->st_size, outfile,
1282                          text, relocs, nb_relocs, 0);
1283             }
1284         }
1285
1286     } else {
1287         /* generate big code generation switch */
1288 fprintf(outfile,
1289 "int dyngen_code(uint8_t *gen_code_buf,\n"
1290 "                uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
1291 "                const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
1292 "{\n"
1293 "    uint8_t *gen_code_ptr;\n"
1294 "    const uint16_t *opc_ptr;\n"
1295 "    const uint32_t *opparam_ptr;\n");
1296
1297 #ifdef HOST_ARM
1298 fprintf(outfile,
1299 "    uint8_t *last_gen_code_ptr = gen_code_buf;\n"
1300 "    LDREntry *arm_ldr_ptr = arm_ldr_table;\n"
1301 "    uint32_t *arm_data_ptr = arm_data_table;\n");
1302 #endif
1303
1304 fprintf(outfile,
1305 "\n"
1306 "    gen_code_ptr = gen_code_buf;\n"
1307 "    opc_ptr = opc_buf;\n"
1308 "    opparam_ptr = opparam_buf;\n");
1309
1310         /* Generate prologue, if needed. */
1311
1312 fprintf(outfile,
1313 "    for(;;) {\n"
1314 "        switch(*opc_ptr++) {\n"
1315 );
1316
1317         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1318             const char *name;
1319             name = strtab + sym->st_name;
1320             if (strstart(name, OP_PREFIX, NULL)) {
1321 #if 0
1322                 printf("%4d: %s pos=0x%08x len=%d\n",
1323                        i, name, sym->st_value, sym->st_size);
1324 #endif
1325                 if (sym->st_shndx != (text_sec - shdr))
1326                     error("invalid section for opcode (0x%x)", sym->st_shndx);
1327                 gen_code(name, sym->st_value, sym->st_size, outfile,
1328                          text, relocs, nb_relocs, 1);
1329             }
1330         }
1331
1332 fprintf(outfile,
1333 "        case INDEX_op_nop:\n"
1334 "            break;\n"
1335 "        case INDEX_op_nop1:\n"
1336 "            opparam_ptr++;\n"
1337 "            break;\n"
1338 "        case INDEX_op_nop2:\n"
1339 "            opparam_ptr += 2;\n"
1340 "            break;\n"
1341 "        case INDEX_op_nop3:\n"
1342 "            opparam_ptr += 3;\n"
1343 "            break;\n"
1344 "        default:\n"
1345 "            goto the_end;\n"
1346 "        }\n");
1347
1348 #ifdef HOST_ARM
1349 /* generate constant table if needed */
1350 fprintf(outfile,
1351 "        if ((gen_code_ptr - last_gen_code_ptr) >= (MAX_FRAG_SIZE - MAX_OP_SIZE)) {\n"
1352 "            gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 1);\n"
1353 "            last_gen_code_ptr = gen_code_ptr;\n"
1354 "            arm_ldr_ptr = arm_ldr_table;\n"
1355 "            arm_data_ptr = arm_data_table;\n"
1356 "        }\n");
1357 #endif
1358
1359
1360 fprintf(outfile,
1361 "    }\n"
1362 " the_end:\n"
1363 );
1364
1365 /* generate some code patching */
1366 #ifdef HOST_ARM
1367 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");
1368 #endif
1369     /* flush instruction cache */
1370     fprintf(outfile, "flush_icache_range((unsigned long)gen_code_buf, (unsigned long)gen_code_ptr);\n");
1371
1372     fprintf(outfile, "return gen_code_ptr -  gen_code_buf;\n");
1373     fprintf(outfile, "}\n\n");
1374
1375     }
1376
1377     close(fd);
1378     return 0;
1379 }
1380
1381 void usage(void)
1382 {
1383     printf("dyngen (c) 2003 Fabrice Bellard\n"
1384            "usage: dyngen [-o outfile] [-c] objfile\n"
1385            "Generate a dynamic code generator from an object file\n"
1386            "-c     output enum of operations\n"
1387            "-g     output gen_op_xx() functions\n"
1388            );
1389     exit(1);
1390 }
1391
1392 int main(int argc, char **argv)
1393 {
1394     int c, out_type;
1395     const char *filename, *outfilename;
1396     FILE *outfile;
1397
1398     outfilename = "out.c";
1399     out_type = OUT_CODE;
1400     for(;;) {
1401         c = getopt(argc, argv, "ho:cg");
1402         if (c == -1)
1403             break;
1404         switch(c) {
1405         case 'h':
1406             usage();
1407             break;
1408         case 'o':
1409             outfilename = optarg;
1410             break;
1411         case 'c':
1412             out_type = OUT_INDEX_OP;
1413             break;
1414         case 'g':
1415             out_type = OUT_GEN_OP;
1416             break;
1417         }
1418     }
1419     if (optind >= argc)
1420         usage();
1421     filename = argv[optind];
1422     outfile = fopen(outfilename, "w");
1423     if (!outfile)
1424         error("could not open '%s'", outfilename);
1425     load_elf(filename, outfile, out_type);
1426     fclose(outfile);
1427     return 0;
1428 }