| 1 | /* Main simulator entry points specific to the CRIS. |
| 2 | Copyright (C) 2004-2019 Free Software Foundation, Inc. |
| 3 | Contributed by Axis Communications. |
| 4 | |
| 5 | This file is part of the GNU simulators. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | /* Based on the fr30 file, mixing in bits from the i960 and pruning of |
| 21 | dead code. */ |
| 22 | |
| 23 | #include "config.h" |
| 24 | #include "libiberty.h" |
| 25 | #include "bfd.h" |
| 26 | #include "elf-bfd.h" |
| 27 | |
| 28 | #include "sim-main.h" |
| 29 | #ifdef HAVE_STDLIB_H |
| 30 | #include <stdlib.h> |
| 31 | #endif |
| 32 | #include <errno.h> |
| 33 | #include "sim-options.h" |
| 34 | #include "dis-asm.h" |
| 35 | |
| 36 | /* Apparently the autoconf bits are missing (though HAVE_ENVIRON is used |
| 37 | in other dirs; also lacking there). Patch around it for major systems. */ |
| 38 | #if defined (HAVE_ENVIRON) || defined (__GLIBC__) |
| 39 | extern char **environ; |
| 40 | #define GET_ENVIRON() environ |
| 41 | #else |
| 42 | char *missing_environ[] = { "SHELL=/bin/sh", "PATH=/bin:/usr/bin", NULL }; |
| 43 | #define GET_ENVIRON() missing_environ |
| 44 | #endif |
| 45 | |
| 46 | /* Used with get_progbounds to find out how much memory is needed for the |
| 47 | program. We don't want to allocate more, since that could mask |
| 48 | invalid memory accesses program bugs. */ |
| 49 | struct progbounds { |
| 50 | USI startmem; |
| 51 | USI endmem; |
| 52 | USI end_loadmem; |
| 53 | USI start_nonloadmem; |
| 54 | }; |
| 55 | |
| 56 | static void free_state (SIM_DESC); |
| 57 | static void get_progbounds_iterator (bfd *, asection *, void *); |
| 58 | static SIM_RC cris_option_handler (SIM_DESC, sim_cpu *, int, char *, int); |
| 59 | |
| 60 | /* Since we don't build the cgen-opcode table, we use the old |
| 61 | disassembler. */ |
| 62 | static CGEN_DISASSEMBLER cris_disassemble_insn; |
| 63 | |
| 64 | /* By default, we set up stack and environment variables like the Linux |
| 65 | kernel. */ |
| 66 | static char cris_bare_iron = 0; |
| 67 | |
| 68 | /* Whether 0x9000000xx have simulator-specific meanings. */ |
| 69 | char cris_have_900000xxif = 0; |
| 70 | |
| 71 | /* Used to optionally override the default start address of the |
| 72 | simulation. */ |
| 73 | static USI cris_start_address = 0xffffffffu; |
| 74 | |
| 75 | /* Used to optionally add offsets to the loaded image and its start |
| 76 | address. (Not used for the interpreter of dynamically loaded |
| 77 | programs or the DSO:s.) */ |
| 78 | static int cris_program_offset = 0; |
| 79 | |
| 80 | /* What to do when we face a more or less unknown syscall. */ |
| 81 | enum cris_unknown_syscall_action_type cris_unknown_syscall_action |
| 82 | = CRIS_USYSC_MSG_STOP; |
| 83 | |
| 84 | /* CRIS-specific options. */ |
| 85 | typedef enum { |
| 86 | OPTION_CRIS_STATS = OPTION_START, |
| 87 | OPTION_CRIS_TRACE, |
| 88 | OPTION_CRIS_NAKED, |
| 89 | OPTION_CRIS_PROGRAM_OFFSET, |
| 90 | OPTION_CRIS_STARTADDR, |
| 91 | OPTION_CRIS_900000XXIF, |
| 92 | OPTION_CRIS_UNKNOWN_SYSCALL |
| 93 | } CRIS_OPTIONS; |
| 94 | |
| 95 | static const OPTION cris_options[] = |
| 96 | { |
| 97 | { {"cris-cycles", required_argument, NULL, OPTION_CRIS_STATS}, |
| 98 | '\0', "basic|unaligned|schedulable|all", |
| 99 | "Dump execution statistics", |
| 100 | cris_option_handler, NULL }, |
| 101 | { {"cris-trace", required_argument, NULL, OPTION_CRIS_TRACE}, |
| 102 | '\0', "basic", |
| 103 | "Emit trace information while running", |
| 104 | cris_option_handler, NULL }, |
| 105 | { {"cris-naked", no_argument, NULL, OPTION_CRIS_NAKED}, |
| 106 | '\0', NULL, "Don't set up stack and environment", |
| 107 | cris_option_handler, NULL }, |
| 108 | { {"cris-900000xx", no_argument, NULL, OPTION_CRIS_900000XXIF}, |
| 109 | '\0', NULL, "Define addresses at 0x900000xx with simulator semantics", |
| 110 | cris_option_handler, NULL }, |
| 111 | { {"cris-unknown-syscall", required_argument, NULL, |
| 112 | OPTION_CRIS_UNKNOWN_SYSCALL}, |
| 113 | '\0', "stop|enosys|enosys-quiet", "Action at an unknown system call", |
| 114 | cris_option_handler, NULL }, |
| 115 | { {"cris-program-offset", required_argument, NULL, |
| 116 | OPTION_CRIS_PROGRAM_OFFSET}, |
| 117 | '\0', "OFFSET", |
| 118 | "Offset image addresses and default start address of a program", |
| 119 | cris_option_handler }, |
| 120 | { {"cris-start-address", required_argument, NULL, OPTION_CRIS_STARTADDR}, |
| 121 | '\0', "ADDRESS", "Set start address", |
| 122 | cris_option_handler }, |
| 123 | { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL } |
| 124 | }; |
| 125 | \f |
| 126 | /* Handle CRIS-specific options. */ |
| 127 | |
| 128 | static SIM_RC |
| 129 | cris_option_handler (SIM_DESC sd, sim_cpu *cpu ATTRIBUTE_UNUSED, int opt, |
| 130 | char *arg, int is_command ATTRIBUTE_UNUSED) |
| 131 | { |
| 132 | /* The options are CRIS-specific, but cpu-specific option-handling is |
| 133 | broken; required to being with "--cpu0-". We store the flags in an |
| 134 | unused field in the global state structure and move the flags over |
| 135 | to the module-specific CPU data when we store things in the |
| 136 | cpu-specific structure. */ |
| 137 | char *tracefp = STATE_TRACE_FLAGS (sd); |
| 138 | char *chp = arg; |
| 139 | |
| 140 | switch ((CRIS_OPTIONS) opt) |
| 141 | { |
| 142 | case OPTION_CRIS_STATS: |
| 143 | if (strcmp (arg, "basic") == 0) |
| 144 | *tracefp = FLAG_CRIS_MISC_PROFILE_SIMPLE; |
| 145 | else if (strcmp (arg, "unaligned") == 0) |
| 146 | *tracefp |
| 147 | = (FLAG_CRIS_MISC_PROFILE_UNALIGNED |
| 148 | | FLAG_CRIS_MISC_PROFILE_SIMPLE); |
| 149 | else if (strcmp (arg, "schedulable") == 0) |
| 150 | *tracefp |
| 151 | = (FLAG_CRIS_MISC_PROFILE_SCHEDULABLE |
| 152 | | FLAG_CRIS_MISC_PROFILE_SIMPLE); |
| 153 | else if (strcmp (arg, "all") == 0) |
| 154 | *tracefp = FLAG_CRIS_MISC_PROFILE_ALL; |
| 155 | else |
| 156 | { |
| 157 | /* Beware; the framework does not handle the error case; |
| 158 | we have to do it ourselves. */ |
| 159 | sim_io_eprintf (sd, "Unknown option `--cris-cycles=%s'\n", arg); |
| 160 | return SIM_RC_FAIL; |
| 161 | } |
| 162 | break; |
| 163 | |
| 164 | case OPTION_CRIS_TRACE: |
| 165 | if (strcmp (arg, "basic") == 0) |
| 166 | *tracefp |= FLAG_CRIS_MISC_PROFILE_XSIM_TRACE; |
| 167 | else |
| 168 | { |
| 169 | sim_io_eprintf (sd, "Unknown option `--cris-trace=%s'\n", arg); |
| 170 | return SIM_RC_FAIL; |
| 171 | } |
| 172 | break; |
| 173 | |
| 174 | case OPTION_CRIS_NAKED: |
| 175 | cris_bare_iron = 1; |
| 176 | break; |
| 177 | |
| 178 | case OPTION_CRIS_900000XXIF: |
| 179 | cris_have_900000xxif = 1; |
| 180 | break; |
| 181 | |
| 182 | case OPTION_CRIS_STARTADDR: |
| 183 | errno = 0; |
| 184 | cris_start_address = (USI) strtoul (chp, &chp, 0); |
| 185 | |
| 186 | if (errno != 0 || *chp != 0) |
| 187 | { |
| 188 | sim_io_eprintf (sd, "Invalid option `--cris-start-address=%s'\n", |
| 189 | arg); |
| 190 | return SIM_RC_FAIL; |
| 191 | } |
| 192 | break; |
| 193 | |
| 194 | case OPTION_CRIS_PROGRAM_OFFSET: |
| 195 | errno = 0; |
| 196 | cris_program_offset = (int) strtol (chp, &chp, 0); |
| 197 | |
| 198 | if (errno != 0 || *chp != 0) |
| 199 | { |
| 200 | sim_io_eprintf (sd, "Invalid option `--cris-program-offset=%s'\n", |
| 201 | arg); |
| 202 | return SIM_RC_FAIL; |
| 203 | } |
| 204 | break; |
| 205 | |
| 206 | case OPTION_CRIS_UNKNOWN_SYSCALL: |
| 207 | if (strcmp (arg, "enosys") == 0) |
| 208 | cris_unknown_syscall_action = CRIS_USYSC_MSG_ENOSYS; |
| 209 | else if (strcmp (arg, "enosys-quiet") == 0) |
| 210 | cris_unknown_syscall_action = CRIS_USYSC_QUIET_ENOSYS; |
| 211 | else if (strcmp (arg, "stop") == 0) |
| 212 | cris_unknown_syscall_action = CRIS_USYSC_MSG_STOP; |
| 213 | else |
| 214 | { |
| 215 | sim_io_eprintf (sd, "Unknown option `--cris-unknown-syscall=%s'\n", |
| 216 | arg); |
| 217 | return SIM_RC_FAIL; |
| 218 | } |
| 219 | break; |
| 220 | |
| 221 | default: |
| 222 | /* We'll actually never get here; the caller handles the error |
| 223 | case. */ |
| 224 | sim_io_eprintf (sd, "Unknown option `%s'\n", arg); |
| 225 | return SIM_RC_FAIL; |
| 226 | } |
| 227 | |
| 228 | /* Imply --profile-model=on. */ |
| 229 | return sim_profile_set_option (sd, "-model", PROFILE_MODEL_IDX, "on"); |
| 230 | } |
| 231 | |
| 232 | /* An ELF-specific simplified ../common/sim-load.c:sim_load_file, |
| 233 | using the program headers, not sections, in order to make sure that |
| 234 | the program headers themeselves are also loaded. The caller is |
| 235 | responsible for asserting that ABFD is an ELF file. */ |
| 236 | |
| 237 | static bfd_boolean |
| 238 | cris_load_elf_file (SIM_DESC sd, struct bfd *abfd, sim_write_fn do_write) |
| 239 | { |
| 240 | Elf_Internal_Phdr *phdr; |
| 241 | int n_hdrs; |
| 242 | int i; |
| 243 | bfd_boolean verbose = STATE_OPEN_KIND (sd) == SIM_OPEN_DEBUG; |
| 244 | |
| 245 | phdr = elf_tdata (abfd)->phdr; |
| 246 | n_hdrs = elf_elfheader (abfd)->e_phnum; |
| 247 | |
| 248 | /* We're only interested in PT_LOAD; all necessary information |
| 249 | should be covered by that. */ |
| 250 | for (i = 0; i < n_hdrs; i++) |
| 251 | { |
| 252 | bfd_byte *buf; |
| 253 | bfd_vma lma = STATE_LOAD_AT_LMA_P (sd) |
| 254 | ? phdr[i].p_paddr : phdr[i].p_vaddr; |
| 255 | |
| 256 | if (phdr[i].p_type != PT_LOAD) |
| 257 | continue; |
| 258 | |
| 259 | buf = xmalloc (phdr[i].p_filesz); |
| 260 | |
| 261 | if (verbose) |
| 262 | sim_io_printf (sd, "Loading segment at 0x%lx, size 0x%lx\n", |
| 263 | lma, phdr[i].p_filesz); |
| 264 | |
| 265 | if (bfd_seek (abfd, phdr[i].p_offset, SEEK_SET) != 0 |
| 266 | || (bfd_bread (buf, phdr[i].p_filesz, abfd) != phdr[i].p_filesz)) |
| 267 | { |
| 268 | sim_io_eprintf (sd, |
| 269 | "%s: could not read segment at 0x%lx, size 0x%lx\n", |
| 270 | STATE_MY_NAME (sd), lma, phdr[i].p_filesz); |
| 271 | free (buf); |
| 272 | return FALSE; |
| 273 | } |
| 274 | |
| 275 | if (do_write (sd, lma, buf, phdr[i].p_filesz) != phdr[i].p_filesz) |
| 276 | { |
| 277 | sim_io_eprintf (sd, |
| 278 | "%s: could not load segment at 0x%lx, size 0x%lx\n", |
| 279 | STATE_MY_NAME (sd), lma, phdr[i].p_filesz); |
| 280 | free (buf); |
| 281 | return FALSE; |
| 282 | } |
| 283 | |
| 284 | free (buf); |
| 285 | } |
| 286 | |
| 287 | return TRUE; |
| 288 | } |
| 289 | |
| 290 | /* Cover function of sim_state_free to free the cpu buffers as well. */ |
| 291 | |
| 292 | static void |
| 293 | free_state (SIM_DESC sd) |
| 294 | { |
| 295 | if (STATE_MODULES (sd) != NULL) |
| 296 | sim_module_uninstall (sd); |
| 297 | sim_cpu_free_all (sd); |
| 298 | sim_state_free (sd); |
| 299 | } |
| 300 | |
| 301 | /* Helper struct for cris_set_section_offset_iterator. */ |
| 302 | |
| 303 | struct offsetinfo |
| 304 | { |
| 305 | SIM_DESC sd; |
| 306 | int offset; |
| 307 | }; |
| 308 | |
| 309 | /* BFD section iterator to offset the LMA and VMA. */ |
| 310 | |
| 311 | static void |
| 312 | cris_set_section_offset_iterator (bfd *abfd, asection *s, void *vp) |
| 313 | { |
| 314 | struct offsetinfo *p = (struct offsetinfo *) vp; |
| 315 | SIM_DESC sd = p->sd; |
| 316 | int offset = p->offset; |
| 317 | |
| 318 | if ((bfd_section_flags (s) & SEC_ALLOC)) |
| 319 | { |
| 320 | bfd_vma vma = bfd_section_vma (s); |
| 321 | |
| 322 | bfd_set_section_vma (s, vma + offset); |
| 323 | } |
| 324 | |
| 325 | /* This seems clumsy and inaccurate, but let's stick to doing it the |
| 326 | same way as sim_analyze_program for consistency. */ |
| 327 | if (strcmp (bfd_section_name (s), ".text") == 0) |
| 328 | STATE_TEXT_START (sd) = bfd_section_vma (s); |
| 329 | } |
| 330 | |
| 331 | /* Adjust the start-address, LMA and VMA of a SD. Must be called |
| 332 | after sim_analyze_program. */ |
| 333 | |
| 334 | static void |
| 335 | cris_offset_sections (SIM_DESC sd, int offset) |
| 336 | { |
| 337 | bfd_boolean ret; |
| 338 | struct bfd *abfd = STATE_PROG_BFD (sd); |
| 339 | asection *text; |
| 340 | struct offsetinfo oi; |
| 341 | |
| 342 | /* Only happens for usage error. */ |
| 343 | if (abfd == NULL) |
| 344 | return; |
| 345 | |
| 346 | oi.sd = sd; |
| 347 | oi.offset = offset; |
| 348 | |
| 349 | bfd_map_over_sections (abfd, cris_set_section_offset_iterator, &oi); |
| 350 | ret = bfd_set_start_address (abfd, bfd_get_start_address (abfd) + offset); |
| 351 | |
| 352 | STATE_START_ADDR (sd) = bfd_get_start_address (abfd); |
| 353 | } |
| 354 | |
| 355 | /* BFD section iterator to find the highest and lowest allocated and |
| 356 | non-allocated section addresses (plus one). */ |
| 357 | |
| 358 | static void |
| 359 | get_progbounds_iterator (bfd *abfd ATTRIBUTE_UNUSED, asection *s, void *vp) |
| 360 | { |
| 361 | struct progbounds *pbp = (struct progbounds *) vp; |
| 362 | |
| 363 | if ((bfd_section_flags (s) & SEC_ALLOC)) |
| 364 | { |
| 365 | bfd_size_type sec_size = bfd_section_size (s); |
| 366 | bfd_size_type sec_start = bfd_section_vma (s); |
| 367 | bfd_size_type sec_end = sec_start + sec_size; |
| 368 | |
| 369 | if (sec_end > pbp->endmem) |
| 370 | pbp->endmem = sec_end; |
| 371 | |
| 372 | if (sec_start < pbp->startmem) |
| 373 | pbp->startmem = sec_start; |
| 374 | |
| 375 | if ((bfd_section_flags (s) & SEC_LOAD)) |
| 376 | { |
| 377 | if (sec_end > pbp->end_loadmem) |
| 378 | pbp->end_loadmem = sec_end; |
| 379 | } |
| 380 | else if (sec_start < pbp->start_nonloadmem) |
| 381 | pbp->start_nonloadmem = sec_start; |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /* Get the program boundaries. Because not everything is covered by |
| 386 | sections in ELF, notably the program headers, we use the program |
| 387 | headers instead. */ |
| 388 | |
| 389 | static void |
| 390 | cris_get_progbounds (struct bfd *abfd, struct progbounds *pbp) |
| 391 | { |
| 392 | Elf_Internal_Phdr *phdr; |
| 393 | int n_hdrs; |
| 394 | int i; |
| 395 | |
| 396 | pbp->startmem = 0xffffffff; |
| 397 | pbp->endmem = 0; |
| 398 | pbp->end_loadmem = 0; |
| 399 | pbp->start_nonloadmem = 0xffffffff; |
| 400 | |
| 401 | /* In case we're ever used for something other than ELF, use the |
| 402 | generic method. */ |
| 403 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 404 | { |
| 405 | bfd_map_over_sections (abfd, get_progbounds_iterator, pbp); |
| 406 | return; |
| 407 | } |
| 408 | |
| 409 | phdr = elf_tdata (abfd)->phdr; |
| 410 | n_hdrs = elf_elfheader (abfd)->e_phnum; |
| 411 | |
| 412 | /* We're only interested in PT_LOAD; all necessary information |
| 413 | should be covered by that. */ |
| 414 | for (i = 0; i < n_hdrs; i++) |
| 415 | { |
| 416 | if (phdr[i].p_type != PT_LOAD) |
| 417 | continue; |
| 418 | |
| 419 | if (phdr[i].p_paddr < pbp->startmem) |
| 420 | pbp->startmem = phdr[i].p_paddr; |
| 421 | |
| 422 | if (phdr[i].p_paddr + phdr[i].p_memsz > pbp->endmem) |
| 423 | pbp->endmem = phdr[i].p_paddr + phdr[i].p_memsz; |
| 424 | |
| 425 | if (phdr[i].p_paddr + phdr[i].p_filesz > pbp->end_loadmem) |
| 426 | pbp->end_loadmem = phdr[i].p_paddr + phdr[i].p_filesz; |
| 427 | |
| 428 | if (phdr[i].p_memsz > phdr[i].p_filesz |
| 429 | && phdr[i].p_paddr + phdr[i].p_filesz < pbp->start_nonloadmem) |
| 430 | pbp->start_nonloadmem = phdr[i].p_paddr + phdr[i].p_filesz; |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | /* Parameter communication by static variables, hmm... Oh well, for |
| 435 | simplicity. */ |
| 436 | static bfd_vma exec_load_addr; |
| 437 | static bfd_vma interp_load_addr; |
| 438 | static bfd_vma interp_start_addr; |
| 439 | |
| 440 | /* Supposed to mimic Linux' "NEW_AUX_ENT (AT_PHDR, load_addr + exec->e_phoff)". */ |
| 441 | |
| 442 | static USI |
| 443 | aux_ent_phdr (struct bfd *ebfd) |
| 444 | { |
| 445 | return elf_elfheader (ebfd)->e_phoff + exec_load_addr; |
| 446 | } |
| 447 | |
| 448 | /* We just pass on the header info; we don't have our own idea of the |
| 449 | program header entry size. */ |
| 450 | |
| 451 | static USI |
| 452 | aux_ent_phent (struct bfd *ebfd) |
| 453 | { |
| 454 | return elf_elfheader (ebfd)->e_phentsize; |
| 455 | } |
| 456 | |
| 457 | /* Like "NEW_AUX_ENT(AT_PHNUM, exec->e_phnum)". */ |
| 458 | |
| 459 | static USI |
| 460 | aux_ent_phnum (struct bfd *ebfd) |
| 461 | { |
| 462 | return elf_elfheader (ebfd)->e_phnum; |
| 463 | } |
| 464 | |
| 465 | /* Like "NEW_AUX_ENT(AT_BASE, interp_load_addr)". */ |
| 466 | |
| 467 | static USI |
| 468 | aux_ent_base (struct bfd *ebfd) |
| 469 | { |
| 470 | return interp_load_addr; |
| 471 | } |
| 472 | |
| 473 | /* Like "NEW_AUX_ENT(AT_ENTRY, exec->e_entry)". */ |
| 474 | |
| 475 | static USI |
| 476 | aux_ent_entry (struct bfd *ebfd) |
| 477 | { |
| 478 | ASSERT (elf_elfheader (ebfd)->e_entry == bfd_get_start_address (ebfd)); |
| 479 | return elf_elfheader (ebfd)->e_entry; |
| 480 | } |
| 481 | |
| 482 | /* Helper for cris_handle_interpreter: like sim_write, but load at |
| 483 | interp_load_addr offset. */ |
| 484 | |
| 485 | static int |
| 486 | cris_write_interp (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length) |
| 487 | { |
| 488 | return sim_write (sd, mem + interp_load_addr, buf, length); |
| 489 | } |
| 490 | |
| 491 | /* Cater to the presence of an interpreter: load it and set |
| 492 | interp_start_addr. Return FALSE if there was an error, TRUE if |
| 493 | everything went fine, including an interpreter being absent and |
| 494 | the program being in a non-ELF format. */ |
| 495 | |
| 496 | static bfd_boolean |
| 497 | cris_handle_interpreter (SIM_DESC sd, struct bfd *abfd) |
| 498 | { |
| 499 | int i, n_hdrs; |
| 500 | bfd_vma phaddr; |
| 501 | bfd_byte buf[4]; |
| 502 | char *interp = NULL; |
| 503 | struct bfd *ibfd; |
| 504 | bfd_boolean ok = FALSE; |
| 505 | Elf_Internal_Phdr *phdr; |
| 506 | |
| 507 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 508 | return TRUE; |
| 509 | |
| 510 | phdr = elf_tdata (abfd)->phdr; |
| 511 | n_hdrs = aux_ent_phnum (abfd); |
| 512 | |
| 513 | /* Check the program headers for presence of an interpreter. */ |
| 514 | for (i = 0; i < n_hdrs; i++) |
| 515 | { |
| 516 | int interplen; |
| 517 | bfd_size_type interpsiz, interp_filesiz; |
| 518 | struct progbounds interp_bounds; |
| 519 | |
| 520 | if (phdr[i].p_type != PT_INTERP) |
| 521 | continue; |
| 522 | |
| 523 | /* Get the name of the interpreter, prepended with the sysroot |
| 524 | (empty if absent). */ |
| 525 | interplen = phdr[i].p_filesz; |
| 526 | interp = xmalloc (interplen + strlen (simulator_sysroot)); |
| 527 | strcpy (interp, simulator_sysroot); |
| 528 | |
| 529 | /* Read in the name. */ |
| 530 | if (bfd_seek (abfd, phdr[i].p_offset, SEEK_SET) != 0 |
| 531 | || (bfd_bread (interp + strlen (simulator_sysroot), interplen, abfd) |
| 532 | != interplen)) |
| 533 | goto interpname_failed; |
| 534 | |
| 535 | /* Like Linux, require the string to be 0-terminated. */ |
| 536 | if (interp[interplen + strlen (simulator_sysroot) - 1] != 0) |
| 537 | goto interpname_failed; |
| 538 | |
| 539 | /* Inspect the interpreter. */ |
| 540 | ibfd = bfd_openr (interp, STATE_TARGET (sd)); |
| 541 | if (ibfd == NULL) |
| 542 | goto interpname_failed; |
| 543 | |
| 544 | /* The interpreter is at least something readable to BFD; make |
| 545 | sure it's an ELF non-archive file. */ |
| 546 | if (!bfd_check_format (ibfd, bfd_object) |
| 547 | || bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 548 | goto interp_failed; |
| 549 | |
| 550 | /* Check the layout of the interpreter. */ |
| 551 | cris_get_progbounds (ibfd, &interp_bounds); |
| 552 | |
| 553 | /* Round down to pagesize the start page and up the endpage. |
| 554 | Don't round the *load and *nonload members. */ |
| 555 | interp_bounds.startmem &= ~8191; |
| 556 | interp_bounds.endmem = (interp_bounds.endmem + 8191) & ~8191; |
| 557 | |
| 558 | /* Until we need a more dynamic solution, assume we can put the |
| 559 | interpreter at this fixed location. NB: this is not what |
| 560 | happens for Linux 2008-12-28, but it could and might and |
| 561 | perhaps should. */ |
| 562 | interp_load_addr = 0x40000; |
| 563 | interpsiz = interp_bounds.endmem - interp_bounds.startmem; |
| 564 | interp_filesiz = interp_bounds.end_loadmem - interp_bounds.startmem; |
| 565 | |
| 566 | /* If we have a non-DSO or interpreter starting at the wrong |
| 567 | address, bail. */ |
| 568 | if (interp_bounds.startmem != 0 |
| 569 | || interpsiz + interp_load_addr >= exec_load_addr) |
| 570 | goto interp_failed; |
| 571 | |
| 572 | /* We don't have the API to get the address of a simulator |
| 573 | memory area, so we go via a temporary area. Luckily, the |
| 574 | interpreter is supposed to be small, less than 0x40000 |
| 575 | bytes. */ |
| 576 | sim_do_commandf (sd, "memory region 0x%lx,0x%lx", |
| 577 | interp_load_addr, interpsiz); |
| 578 | |
| 579 | /* Now that memory for the interpreter is defined, load it. */ |
| 580 | if (!cris_load_elf_file (sd, ibfd, cris_write_interp)) |
| 581 | goto interp_failed; |
| 582 | |
| 583 | /* It's no use setting STATE_START_ADDR, because it gets |
| 584 | overwritten by a sim_analyze_program call in sim_load. Let's |
| 585 | just store it locally. */ |
| 586 | interp_start_addr |
| 587 | = (bfd_get_start_address (ibfd) |
| 588 | - interp_bounds.startmem + interp_load_addr); |
| 589 | |
| 590 | /* Linux cares only about the first PT_INTERP, so let's ignore |
| 591 | the rest. */ |
| 592 | goto all_done; |
| 593 | } |
| 594 | |
| 595 | /* Register R10 should hold 0 at static start (no finifunc), but |
| 596 | that's the default, so don't bother. */ |
| 597 | return TRUE; |
| 598 | |
| 599 | all_done: |
| 600 | ok = TRUE; |
| 601 | |
| 602 | interp_failed: |
| 603 | bfd_close (ibfd); |
| 604 | |
| 605 | interpname_failed: |
| 606 | if (!ok) |
| 607 | sim_io_eprintf (sd, |
| 608 | "%s: could not load ELF interpreter `%s' for program `%s'\n", |
| 609 | STATE_MY_NAME (sd), |
| 610 | interp == NULL ? "(what's-its-name)" : interp, |
| 611 | bfd_get_filename (abfd)); |
| 612 | free (interp); |
| 613 | return ok; |
| 614 | } |
| 615 | |
| 616 | /* Create an instance of the simulator. */ |
| 617 | |
| 618 | SIM_DESC |
| 619 | sim_open (SIM_OPEN_KIND kind, host_callback *callback, struct bfd *abfd, |
| 620 | char * const *argv) |
| 621 | { |
| 622 | char c; |
| 623 | int i; |
| 624 | USI startmem = 0; |
| 625 | USI endmem = CRIS_DEFAULT_MEM_SIZE; |
| 626 | USI endbrk = endmem; |
| 627 | USI stack_low = 0; |
| 628 | SIM_DESC sd = sim_state_alloc (kind, callback); |
| 629 | |
| 630 | static const struct auxv_entries_s |
| 631 | { |
| 632 | bfd_byte id; |
| 633 | USI (*efn) (struct bfd *ebfd); |
| 634 | USI val; |
| 635 | } auxv_entries[] = |
| 636 | { |
| 637 | #define AUX_ENT(a, b) {a, NULL, b} |
| 638 | #define AUX_ENTF(a, f) {a, f, 0} |
| 639 | AUX_ENT (AT_HWCAP, 0), |
| 640 | AUX_ENT (AT_PAGESZ, 8192), |
| 641 | AUX_ENT (AT_CLKTCK, 100), |
| 642 | AUX_ENTF (AT_PHDR, aux_ent_phdr), |
| 643 | AUX_ENTF (AT_PHENT, aux_ent_phent), |
| 644 | AUX_ENTF (AT_PHNUM, aux_ent_phnum), |
| 645 | AUX_ENTF (AT_BASE, aux_ent_base), |
| 646 | AUX_ENT (AT_FLAGS, 0), |
| 647 | AUX_ENTF (AT_ENTRY, aux_ent_entry), |
| 648 | |
| 649 | /* Or is root better? Maybe have it settable? */ |
| 650 | AUX_ENT (AT_UID, 500), |
| 651 | AUX_ENT (AT_EUID, 500), |
| 652 | AUX_ENT (AT_GID, 500), |
| 653 | AUX_ENT (AT_EGID, 500), |
| 654 | AUX_ENT (AT_SECURE, 0), |
| 655 | AUX_ENT (AT_NULL, 0) |
| 656 | }; |
| 657 | |
| 658 | /* Can't initialize to "" below. It's either a GCC bug in old |
| 659 | releases (up to and including 2.95.3 (.4 in debian) or a bug in the |
| 660 | standard ;-) that the rest of the elements won't be initialized. */ |
| 661 | bfd_byte sp_init[4] = {0, 0, 0, 0}; |
| 662 | |
| 663 | /* The cpu data is kept in a separately allocated chunk of memory. */ |
| 664 | if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK) |
| 665 | { |
| 666 | free_state (sd); |
| 667 | return 0; |
| 668 | } |
| 669 | |
| 670 | if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK) |
| 671 | { |
| 672 | free_state (sd); |
| 673 | return 0; |
| 674 | } |
| 675 | |
| 676 | /* Add the CRIS-specific option list to the simulator. */ |
| 677 | if (sim_add_option_table (sd, NULL, cris_options) != SIM_RC_OK) |
| 678 | { |
| 679 | free_state (sd); |
| 680 | return 0; |
| 681 | } |
| 682 | |
| 683 | /* The parser will print an error message for us, so we silently return. */ |
| 684 | if (sim_parse_args (sd, argv) != SIM_RC_OK) |
| 685 | { |
| 686 | free_state (sd); |
| 687 | return 0; |
| 688 | } |
| 689 | |
| 690 | /* check for/establish the reference program image */ |
| 691 | if (sim_analyze_program (sd, |
| 692 | (STATE_PROG_ARGV (sd) != NULL |
| 693 | ? *STATE_PROG_ARGV (sd) |
| 694 | : NULL), |
| 695 | abfd) != SIM_RC_OK) |
| 696 | { |
| 697 | /* When there's an error, sim_analyze_program has already output |
| 698 | a message. Let's just clarify it, as "not an object file" |
| 699 | perhaps doesn't ring a bell. */ |
| 700 | sim_io_eprintf (sd, "(not a CRIS program)\n"); |
| 701 | free_state (sd); |
| 702 | return 0; |
| 703 | } |
| 704 | |
| 705 | /* We might get called with the caller expecting us to get hold of |
| 706 | the bfd for ourselves, which would happen at the |
| 707 | sim_analyze_program call above. */ |
| 708 | if (abfd == NULL) |
| 709 | abfd = STATE_PROG_BFD (sd); |
| 710 | |
| 711 | /* Adjust the addresses of the program at this point. Unfortunately |
| 712 | this does not affect ELF program headers, so we have to handle |
| 713 | that separately. */ |
| 714 | cris_offset_sections (sd, cris_program_offset); |
| 715 | |
| 716 | if (abfd != NULL && bfd_get_arch (abfd) == bfd_arch_unknown) |
| 717 | { |
| 718 | if (STATE_PROG_ARGV (sd) != NULL) |
| 719 | sim_io_eprintf (sd, "%s: `%s' is not a CRIS program\n", |
| 720 | STATE_MY_NAME (sd), *STATE_PROG_ARGV (sd)); |
| 721 | else |
| 722 | sim_io_eprintf (sd, "%s: program to be run is not a CRIS program\n", |
| 723 | STATE_MY_NAME (sd)); |
| 724 | free_state (sd); |
| 725 | return 0; |
| 726 | } |
| 727 | |
| 728 | /* For CRIS simulator-specific use, we need to find out the bounds of |
| 729 | the program as well, which is not done by sim_analyze_program |
| 730 | above. */ |
| 731 | if (abfd != NULL) |
| 732 | { |
| 733 | struct progbounds pb; |
| 734 | |
| 735 | /* The sections should now be accessible using bfd functions. */ |
| 736 | cris_get_progbounds (abfd, &pb); |
| 737 | |
| 738 | /* We align the area that the program uses to page boundaries. */ |
| 739 | startmem = pb.startmem & ~8191; |
| 740 | endbrk = pb.endmem; |
| 741 | endmem = (endbrk + 8191) & ~8191; |
| 742 | } |
| 743 | |
| 744 | /* Find out how much room is needed for the environment and argv, create |
| 745 | that memory and fill it. Only do this when there's a program |
| 746 | specified. */ |
| 747 | if (abfd != NULL && !cris_bare_iron) |
| 748 | { |
| 749 | const char *name = bfd_get_filename (abfd); |
| 750 | char **my_environ = GET_ENVIRON (); |
| 751 | /* We use these maps to give the same behavior as the old xsim |
| 752 | simulator. */ |
| 753 | USI envtop = 0x40000000; |
| 754 | USI stacktop = 0x3e000000; |
| 755 | USI envstart; |
| 756 | int envc; |
| 757 | int len = strlen (name) + 1; |
| 758 | USI epp, epp0; |
| 759 | USI stacklen; |
| 760 | int i; |
| 761 | char **prog_argv = STATE_PROG_ARGV (sd); |
| 762 | int my_argc = 0; |
| 763 | USI csp; |
| 764 | bfd_byte buf[4]; |
| 765 | |
| 766 | /* Count in the environment as well. */ |
| 767 | for (envc = 0; my_environ[envc] != NULL; envc++) |
| 768 | len += strlen (my_environ[envc]) + 1; |
| 769 | |
| 770 | for (i = 0; prog_argv[i] != NULL; my_argc++, i++) |
| 771 | len += strlen (prog_argv[i]) + 1; |
| 772 | |
| 773 | envstart = (envtop - len) & ~8191; |
| 774 | |
| 775 | /* Create read-only block for the environment strings. */ |
| 776 | sim_core_attach (sd, NULL, 0, access_read, 0, |
| 777 | envstart, (len + 8191) & ~8191, |
| 778 | 0, NULL, NULL); |
| 779 | |
| 780 | /* This shouldn't happen. */ |
| 781 | if (envstart < stacktop) |
| 782 | stacktop = envstart - 64 * 8192; |
| 783 | |
| 784 | csp = stacktop; |
| 785 | |
| 786 | /* Note that the linux kernel does not correctly compute the storage |
| 787 | needs for the static-exe AUX vector. */ |
| 788 | |
| 789 | csp -= ARRAY_SIZE (auxv_entries) * 4 * 2; |
| 790 | |
| 791 | csp -= (envc + 1) * 4; |
| 792 | csp -= (my_argc + 1) * 4; |
| 793 | csp -= 4; |
| 794 | |
| 795 | /* Write the target representation of the start-up-value for the |
| 796 | stack-pointer suitable for register initialization below. */ |
| 797 | bfd_putl32 (csp, sp_init); |
| 798 | |
| 799 | /* If we make this 1M higher; say 8192*1024, we have to take |
| 800 | special precautions for pthreads, because pthreads assumes that |
| 801 | the memory that low isn't mmapped, and that it can mmap it |
| 802 | without fallback in case of failure (and we fail ungracefully |
| 803 | long before *that*: the memory isn't accounted for in our mmap |
| 804 | list). */ |
| 805 | stack_low = (csp - (7168*1024)) & ~8191; |
| 806 | |
| 807 | stacklen = stacktop - stack_low; |
| 808 | |
| 809 | /* Tee hee, we have an executable stack. Well, it's necessary to |
| 810 | test GCC trampolines... */ |
| 811 | sim_core_attach (sd, NULL, 0, access_read_write_exec, 0, |
| 812 | stack_low, stacklen, |
| 813 | 0, NULL, NULL); |
| 814 | |
| 815 | epp = epp0 = envstart; |
| 816 | |
| 817 | /* Can't use sim_core_write_unaligned_4 without everything |
| 818 | initialized when tracing, and then these writes would get into |
| 819 | the trace. */ |
| 820 | #define write_dword(addr, data) \ |
| 821 | do \ |
| 822 | { \ |
| 823 | USI data_ = data; \ |
| 824 | USI addr_ = addr; \ |
| 825 | bfd_putl32 (data_, buf); \ |
| 826 | if (sim_core_write_buffer (sd, NULL, NULL_CIA, buf, addr_, 4) != 4)\ |
| 827 | goto abandon_chip; \ |
| 828 | } \ |
| 829 | while (0) |
| 830 | |
| 831 | write_dword (csp, my_argc); |
| 832 | csp += 4; |
| 833 | |
| 834 | for (i = 0; i < my_argc; i++, csp += 4) |
| 835 | { |
| 836 | size_t strln = strlen (prog_argv[i]) + 1; |
| 837 | |
| 838 | if (sim_core_write_buffer (sd, NULL, NULL_CIA, prog_argv[i], epp, |
| 839 | strln) |
| 840 | != strln) |
| 841 | goto abandon_chip; |
| 842 | |
| 843 | write_dword (csp, envstart + epp - epp0); |
| 844 | epp += strln; |
| 845 | } |
| 846 | |
| 847 | write_dword (csp, 0); |
| 848 | csp += 4; |
| 849 | |
| 850 | for (i = 0; i < envc; i++, csp += 4) |
| 851 | { |
| 852 | unsigned int strln = strlen (my_environ[i]) + 1; |
| 853 | |
| 854 | if (sim_core_write_buffer (sd, NULL, NULL_CIA, my_environ[i], epp, |
| 855 | strln) |
| 856 | != strln) |
| 857 | goto abandon_chip; |
| 858 | |
| 859 | write_dword (csp, envstart + epp - epp0); |
| 860 | epp += strln; |
| 861 | } |
| 862 | |
| 863 | write_dword (csp, 0); |
| 864 | csp += 4; |
| 865 | |
| 866 | /* The load address of the executable could presumably be |
| 867 | different than the lowest used memory address, but let's |
| 868 | stick to simplicity until needed. And |
| 869 | cris_handle_interpreter might change startmem and endmem, so |
| 870 | let's set it now. */ |
| 871 | exec_load_addr = startmem; |
| 872 | |
| 873 | if (!cris_handle_interpreter (sd, abfd)) |
| 874 | goto abandon_chip; |
| 875 | |
| 876 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
| 877 | for (i = 0; i < ARRAY_SIZE (auxv_entries); i++) |
| 878 | { |
| 879 | write_dword (csp, auxv_entries[i].id); |
| 880 | write_dword (csp + 4, |
| 881 | auxv_entries[i].efn != NULL |
| 882 | ? (*auxv_entries[i].efn) (abfd) |
| 883 | : auxv_entries[i].val); |
| 884 | csp += 4 + 4; |
| 885 | } |
| 886 | } |
| 887 | |
| 888 | /* Allocate core managed memory if none specified by user. */ |
| 889 | if (sim_core_read_buffer (sd, NULL, read_map, &c, startmem, 1) == 0) |
| 890 | sim_do_commandf (sd, "memory region 0x%lx,0x%lx", startmem, |
| 891 | endmem - startmem); |
| 892 | |
| 893 | /* Allocate simulator I/O managed memory if none specified by user. */ |
| 894 | if (cris_have_900000xxif) |
| 895 | sim_hw_parse (sd, "/core/%s/reg %#x %i", "cris_900000xx", 0x90000000, 0x100); |
| 896 | |
| 897 | /* Establish any remaining configuration options. */ |
| 898 | if (sim_config (sd) != SIM_RC_OK) |
| 899 | { |
| 900 | abandon_chip: |
| 901 | free_state (sd); |
| 902 | return 0; |
| 903 | } |
| 904 | |
| 905 | if (sim_post_argv_init (sd) != SIM_RC_OK) |
| 906 | { |
| 907 | free_state (sd); |
| 908 | return 0; |
| 909 | } |
| 910 | |
| 911 | /* Open a copy of the cpu descriptor table. */ |
| 912 | { |
| 913 | CGEN_CPU_DESC cd = cris_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name, |
| 914 | CGEN_ENDIAN_LITTLE); |
| 915 | for (i = 0; i < MAX_NR_PROCESSORS; ++i) |
| 916 | { |
| 917 | SIM_CPU *cpu = STATE_CPU (sd, i); |
| 918 | CPU_CPU_DESC (cpu) = cd; |
| 919 | CPU_DISASSEMBLER (cpu) = cris_disassemble_insn; |
| 920 | |
| 921 | /* See cris_option_handler for the reason why this is needed. */ |
| 922 | CPU_CRIS_MISC_PROFILE (cpu)->flags = STATE_TRACE_FLAGS (sd)[0]; |
| 923 | |
| 924 | /* Set SP to the stack we allocated above. */ |
| 925 | (* CPU_REG_STORE (cpu)) (cpu, H_GR_SP, (char *) sp_init, 4); |
| 926 | |
| 927 | /* Set the simulator environment data. */ |
| 928 | cpu->highest_mmapped_page = NULL; |
| 929 | cpu->endmem = endmem; |
| 930 | cpu->endbrk = endbrk; |
| 931 | cpu->stack_low = stack_low; |
| 932 | cpu->syscalls = 0; |
| 933 | cpu->m1threads = 0; |
| 934 | cpu->threadno = 0; |
| 935 | cpu->max_threadid = 0; |
| 936 | cpu->thread_data = NULL; |
| 937 | memset (cpu->sighandler, 0, sizeof (cpu->sighandler)); |
| 938 | cpu->make_thread_cpu_data = NULL; |
| 939 | cpu->thread_cpu_data_size = 0; |
| 940 | #if WITH_HW |
| 941 | cpu->deliver_interrupt = NULL; |
| 942 | #endif |
| 943 | } |
| 944 | #if WITH_HW |
| 945 | /* Always be cycle-accurate and call before/after functions if |
| 946 | with-hardware. */ |
| 947 | sim_profile_set_option (sd, "-model", PROFILE_MODEL_IDX, "on"); |
| 948 | #endif |
| 949 | } |
| 950 | |
| 951 | /* Initialize various cgen things not done by common framework. |
| 952 | Must be done after cris_cgen_cpu_open. */ |
| 953 | cgen_init (sd); |
| 954 | |
| 955 | cris_set_callbacks (callback); |
| 956 | |
| 957 | return sd; |
| 958 | } |
| 959 | \f |
| 960 | SIM_RC |
| 961 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, |
| 962 | char * const *argv ATTRIBUTE_UNUSED, |
| 963 | char * const *envp ATTRIBUTE_UNUSED) |
| 964 | { |
| 965 | SIM_CPU *current_cpu = STATE_CPU (sd, 0); |
| 966 | SIM_ADDR addr; |
| 967 | |
| 968 | if (sd != NULL) |
| 969 | addr = cris_start_address != (SIM_ADDR) -1 |
| 970 | ? cris_start_address |
| 971 | : (interp_start_addr != 0 |
| 972 | ? interp_start_addr |
| 973 | : bfd_get_start_address (abfd)); |
| 974 | else |
| 975 | addr = 0; |
| 976 | sim_pc_set (current_cpu, addr); |
| 977 | |
| 978 | /* Standalone mode (i.e. `run`) will take care of the argv for us in |
| 979 | sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' |
| 980 | with `gdb`), we need to handle it because the user can change the |
| 981 | argv on the fly via gdb's 'run'. */ |
| 982 | if (STATE_PROG_ARGV (sd) != argv) |
| 983 | { |
| 984 | freeargv (STATE_PROG_ARGV (sd)); |
| 985 | STATE_PROG_ARGV (sd) = dupargv (argv); |
| 986 | } |
| 987 | |
| 988 | return SIM_RC_OK; |
| 989 | } |
| 990 | \f |
| 991 | /* Disassemble an instruction. */ |
| 992 | |
| 993 | static void |
| 994 | cris_disassemble_insn (SIM_CPU *cpu, |
| 995 | const CGEN_INSN *insn ATTRIBUTE_UNUSED, |
| 996 | const ARGBUF *abuf ATTRIBUTE_UNUSED, |
| 997 | IADDR pc, char *buf) |
| 998 | { |
| 999 | disassembler_ftype pinsn; |
| 1000 | struct disassemble_info disasm_info; |
| 1001 | SFILE sfile; |
| 1002 | SIM_DESC sd = CPU_STATE (cpu); |
| 1003 | |
| 1004 | sfile.buffer = sfile.current = buf; |
| 1005 | INIT_DISASSEMBLE_INFO (disasm_info, (FILE *) &sfile, |
| 1006 | (fprintf_ftype) sim_disasm_sprintf); |
| 1007 | disasm_info.endian = BFD_ENDIAN_LITTLE; |
| 1008 | disasm_info.read_memory_func = sim_disasm_read_memory; |
| 1009 | disasm_info.memory_error_func = sim_disasm_perror_memory; |
| 1010 | disasm_info.application_data = (PTR) cpu; |
| 1011 | pinsn = cris_get_disassembler (STATE_PROG_BFD (sd)); |
| 1012 | (*pinsn) (pc, &disasm_info); |
| 1013 | } |