git.maemo.org Git - qemu/blob - dyngen.c

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