| 1 | /* IBM RS/6000 native-dependent code for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-1987, 1989, 1991-2004, 2007-2012 Free Software |
| 4 | Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "inferior.h" |
| 23 | #include "target.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "xcoffsolib.h" |
| 26 | #include "symfile.h" |
| 27 | #include "objfiles.h" |
| 28 | #include "libbfd.h" /* For bfd_default_set_arch_mach (FIXME) */ |
| 29 | #include "bfd.h" |
| 30 | #include "exceptions.h" |
| 31 | #include "gdb-stabs.h" |
| 32 | #include "regcache.h" |
| 33 | #include "arch-utils.h" |
| 34 | #include "inf-ptrace.h" |
| 35 | #include "ppc-tdep.h" |
| 36 | #include "rs6000-tdep.h" |
| 37 | #include "exec.h" |
| 38 | #include "observer.h" |
| 39 | #include "xcoffread.h" |
| 40 | |
| 41 | #include <sys/ptrace.h> |
| 42 | #include <sys/reg.h> |
| 43 | |
| 44 | #include <sys/param.h> |
| 45 | #include <sys/dir.h> |
| 46 | #include <sys/user.h> |
| 47 | #include <signal.h> |
| 48 | #include <sys/ioctl.h> |
| 49 | #include <fcntl.h> |
| 50 | #include <errno.h> |
| 51 | |
| 52 | #include <a.out.h> |
| 53 | #include <sys/file.h> |
| 54 | #include "gdb_stat.h" |
| 55 | #include <sys/core.h> |
| 56 | #define __LDINFO_PTRACE32__ /* for __ld_info32 */ |
| 57 | #define __LDINFO_PTRACE64__ /* for __ld_info64 */ |
| 58 | #include <sys/ldr.h> |
| 59 | #include <sys/systemcfg.h> |
| 60 | |
| 61 | /* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for |
| 62 | debugging 32-bit and 64-bit processes. Define a typedef and macros for |
| 63 | accessing fields in the appropriate structures. */ |
| 64 | |
| 65 | /* In 32-bit compilation mode (which is the only mode from which ptrace() |
| 66 | works on 4.3), __ld_info32 is #defined as equivalent to ld_info. */ |
| 67 | |
| 68 | #ifdef __ld_info32 |
| 69 | # define ARCH3264 |
| 70 | #endif |
| 71 | |
| 72 | /* Return whether the current architecture is 64-bit. */ |
| 73 | |
| 74 | #ifndef ARCH3264 |
| 75 | # define ARCH64() 0 |
| 76 | #else |
| 77 | # define ARCH64() (register_size (target_gdbarch, 0) == 8) |
| 78 | #endif |
| 79 | |
| 80 | /* Union of 32-bit and 64-bit versions of ld_info. */ |
| 81 | |
| 82 | typedef union { |
| 83 | #ifndef ARCH3264 |
| 84 | struct ld_info l32; |
| 85 | struct ld_info l64; |
| 86 | #else |
| 87 | struct __ld_info32 l32; |
| 88 | struct __ld_info64 l64; |
| 89 | #endif |
| 90 | } LdInfo; |
| 91 | |
| 92 | /* If compiling with 32-bit and 64-bit debugging capability (e.g. AIX 4.x), |
| 93 | declare and initialize a variable named VAR suitable for use as the arch64 |
| 94 | parameter to the various LDI_*() macros. */ |
| 95 | |
| 96 | #ifndef ARCH3264 |
| 97 | # define ARCH64_DECL(var) |
| 98 | #else |
| 99 | # define ARCH64_DECL(var) int var = ARCH64 () |
| 100 | #endif |
| 101 | |
| 102 | /* Return LDI's FIELD for a 64-bit process if ARCH64 and for a 32-bit process |
| 103 | otherwise. This technique only works for FIELDs with the same data type in |
| 104 | 32-bit and 64-bit versions of ld_info. */ |
| 105 | |
| 106 | #ifndef ARCH3264 |
| 107 | # define LDI_FIELD(ldi, arch64, field) (ldi)->l32.ldinfo_##field |
| 108 | #else |
| 109 | # define LDI_FIELD(ldi, arch64, field) \ |
| 110 | (arch64 ? (ldi)->l64.ldinfo_##field : (ldi)->l32.ldinfo_##field) |
| 111 | #endif |
| 112 | |
| 113 | /* Return various LDI fields for a 64-bit process if ARCH64 and for a 32-bit |
| 114 | process otherwise. */ |
| 115 | |
| 116 | #define LDI_NEXT(ldi, arch64) LDI_FIELD(ldi, arch64, next) |
| 117 | #define LDI_FD(ldi, arch64) LDI_FIELD(ldi, arch64, fd) |
| 118 | #define LDI_FILENAME(ldi, arch64) LDI_FIELD(ldi, arch64, filename) |
| 119 | |
| 120 | extern struct vmap *map_vmap (bfd * bf, bfd * arch); |
| 121 | |
| 122 | static void vmap_exec (void); |
| 123 | |
| 124 | static void vmap_ldinfo (LdInfo *); |
| 125 | |
| 126 | static struct vmap *add_vmap (LdInfo *); |
| 127 | |
| 128 | static int objfile_symbol_add (void *); |
| 129 | |
| 130 | static void vmap_symtab (struct vmap *); |
| 131 | |
| 132 | static void exec_one_dummy_insn (struct regcache *); |
| 133 | |
| 134 | extern void fixup_breakpoints (CORE_ADDR low, CORE_ADDR high, CORE_ADDR delta); |
| 135 | |
| 136 | /* Given REGNO, a gdb register number, return the corresponding |
| 137 | number suitable for use as a ptrace() parameter. Return -1 if |
| 138 | there's no suitable mapping. Also, set the int pointed to by |
| 139 | ISFLOAT to indicate whether REGNO is a floating point register. */ |
| 140 | |
| 141 | static int |
| 142 | regmap (struct gdbarch *gdbarch, int regno, int *isfloat) |
| 143 | { |
| 144 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 145 | |
| 146 | *isfloat = 0; |
| 147 | if (tdep->ppc_gp0_regnum <= regno |
| 148 | && regno < tdep->ppc_gp0_regnum + ppc_num_gprs) |
| 149 | return regno; |
| 150 | else if (tdep->ppc_fp0_regnum >= 0 |
| 151 | && tdep->ppc_fp0_regnum <= regno |
| 152 | && regno < tdep->ppc_fp0_regnum + ppc_num_fprs) |
| 153 | { |
| 154 | *isfloat = 1; |
| 155 | return regno - tdep->ppc_fp0_regnum + FPR0; |
| 156 | } |
| 157 | else if (regno == gdbarch_pc_regnum (gdbarch)) |
| 158 | return IAR; |
| 159 | else if (regno == tdep->ppc_ps_regnum) |
| 160 | return MSR; |
| 161 | else if (regno == tdep->ppc_cr_regnum) |
| 162 | return CR; |
| 163 | else if (regno == tdep->ppc_lr_regnum) |
| 164 | return LR; |
| 165 | else if (regno == tdep->ppc_ctr_regnum) |
| 166 | return CTR; |
| 167 | else if (regno == tdep->ppc_xer_regnum) |
| 168 | return XER; |
| 169 | else if (tdep->ppc_fpscr_regnum >= 0 |
| 170 | && regno == tdep->ppc_fpscr_regnum) |
| 171 | return FPSCR; |
| 172 | else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum) |
| 173 | return MQ; |
| 174 | else |
| 175 | return -1; |
| 176 | } |
| 177 | |
| 178 | /* Call ptrace(REQ, ID, ADDR, DATA, BUF). */ |
| 179 | |
| 180 | static int |
| 181 | rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf) |
| 182 | { |
| 183 | int ret = ptrace (req, id, (int *)addr, data, buf); |
| 184 | #if 0 |
| 185 | printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n", |
| 186 | req, id, (unsigned int)addr, data, (unsigned int)buf, ret); |
| 187 | #endif |
| 188 | return ret; |
| 189 | } |
| 190 | |
| 191 | /* Call ptracex(REQ, ID, ADDR, DATA, BUF). */ |
| 192 | |
| 193 | static int |
| 194 | rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf) |
| 195 | { |
| 196 | #ifdef ARCH3264 |
| 197 | int ret = ptracex (req, id, addr, data, buf); |
| 198 | #else |
| 199 | int ret = 0; |
| 200 | #endif |
| 201 | #if 0 |
| 202 | printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n", |
| 203 | req, id, hex_string (addr), data, (unsigned int)buf, ret); |
| 204 | #endif |
| 205 | return ret; |
| 206 | } |
| 207 | |
| 208 | /* Fetch register REGNO from the inferior. */ |
| 209 | |
| 210 | static void |
| 211 | fetch_register (struct regcache *regcache, int regno) |
| 212 | { |
| 213 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 214 | int addr[MAX_REGISTER_SIZE]; |
| 215 | int nr, isfloat; |
| 216 | |
| 217 | /* Retrieved values may be -1, so infer errors from errno. */ |
| 218 | errno = 0; |
| 219 | |
| 220 | nr = regmap (gdbarch, regno, &isfloat); |
| 221 | |
| 222 | /* Floating-point registers. */ |
| 223 | if (isfloat) |
| 224 | rs6000_ptrace32 (PT_READ_FPR, PIDGET (inferior_ptid), addr, nr, 0); |
| 225 | |
| 226 | /* Bogus register number. */ |
| 227 | else if (nr < 0) |
| 228 | { |
| 229 | if (regno >= gdbarch_num_regs (gdbarch)) |
| 230 | fprintf_unfiltered (gdb_stderr, |
| 231 | "gdb error: register no %d not implemented.\n", |
| 232 | regno); |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | /* Fixed-point registers. */ |
| 237 | else |
| 238 | { |
| 239 | if (!ARCH64 ()) |
| 240 | *addr = rs6000_ptrace32 (PT_READ_GPR, PIDGET (inferior_ptid), |
| 241 | (int *) nr, 0, 0); |
| 242 | else |
| 243 | { |
| 244 | /* PT_READ_GPR requires the buffer parameter to point to long long, |
| 245 | even if the register is really only 32 bits. */ |
| 246 | long long buf; |
| 247 | rs6000_ptrace64 (PT_READ_GPR, PIDGET (inferior_ptid), nr, 0, &buf); |
| 248 | if (register_size (gdbarch, regno) == 8) |
| 249 | memcpy (addr, &buf, 8); |
| 250 | else |
| 251 | *addr = buf; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | if (!errno) |
| 256 | regcache_raw_supply (regcache, regno, (char *) addr); |
| 257 | else |
| 258 | { |
| 259 | #if 0 |
| 260 | /* FIXME: this happens 3 times at the start of each 64-bit program. */ |
| 261 | perror (_("ptrace read")); |
| 262 | #endif |
| 263 | errno = 0; |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | /* Store register REGNO back into the inferior. */ |
| 268 | |
| 269 | static void |
| 270 | store_register (struct regcache *regcache, int regno) |
| 271 | { |
| 272 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 273 | int addr[MAX_REGISTER_SIZE]; |
| 274 | int nr, isfloat; |
| 275 | |
| 276 | /* Fetch the register's value from the register cache. */ |
| 277 | regcache_raw_collect (regcache, regno, addr); |
| 278 | |
| 279 | /* -1 can be a successful return value, so infer errors from errno. */ |
| 280 | errno = 0; |
| 281 | |
| 282 | nr = regmap (gdbarch, regno, &isfloat); |
| 283 | |
| 284 | /* Floating-point registers. */ |
| 285 | if (isfloat) |
| 286 | rs6000_ptrace32 (PT_WRITE_FPR, PIDGET (inferior_ptid), addr, nr, 0); |
| 287 | |
| 288 | /* Bogus register number. */ |
| 289 | else if (nr < 0) |
| 290 | { |
| 291 | if (regno >= gdbarch_num_regs (gdbarch)) |
| 292 | fprintf_unfiltered (gdb_stderr, |
| 293 | "gdb error: register no %d not implemented.\n", |
| 294 | regno); |
| 295 | } |
| 296 | |
| 297 | /* Fixed-point registers. */ |
| 298 | else |
| 299 | { |
| 300 | if (regno == gdbarch_sp_regnum (gdbarch)) |
| 301 | /* Execute one dummy instruction (which is a breakpoint) in inferior |
| 302 | process to give kernel a chance to do internal housekeeping. |
| 303 | Otherwise the following ptrace(2) calls will mess up user stack |
| 304 | since kernel will get confused about the bottom of the stack |
| 305 | (%sp). */ |
| 306 | exec_one_dummy_insn (regcache); |
| 307 | |
| 308 | /* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors, |
| 309 | the register's value is passed by value, but for 64-bit inferiors, |
| 310 | the address of a buffer containing the value is passed. */ |
| 311 | if (!ARCH64 ()) |
| 312 | rs6000_ptrace32 (PT_WRITE_GPR, PIDGET (inferior_ptid), |
| 313 | (int *) nr, *addr, 0); |
| 314 | else |
| 315 | { |
| 316 | /* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte |
| 317 | area, even if the register is really only 32 bits. */ |
| 318 | long long buf; |
| 319 | if (register_size (gdbarch, regno) == 8) |
| 320 | memcpy (&buf, addr, 8); |
| 321 | else |
| 322 | buf = *addr; |
| 323 | rs6000_ptrace64 (PT_WRITE_GPR, PIDGET (inferior_ptid), nr, 0, &buf); |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | if (errno) |
| 328 | { |
| 329 | perror (_("ptrace write")); |
| 330 | errno = 0; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | /* Read from the inferior all registers if REGNO == -1 and just register |
| 335 | REGNO otherwise. */ |
| 336 | |
| 337 | static void |
| 338 | rs6000_fetch_inferior_registers (struct target_ops *ops, |
| 339 | struct regcache *regcache, int regno) |
| 340 | { |
| 341 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 342 | if (regno != -1) |
| 343 | fetch_register (regcache, regno); |
| 344 | |
| 345 | else |
| 346 | { |
| 347 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 348 | |
| 349 | /* Read 32 general purpose registers. */ |
| 350 | for (regno = tdep->ppc_gp0_regnum; |
| 351 | regno < tdep->ppc_gp0_regnum + ppc_num_gprs; |
| 352 | regno++) |
| 353 | { |
| 354 | fetch_register (regcache, regno); |
| 355 | } |
| 356 | |
| 357 | /* Read general purpose floating point registers. */ |
| 358 | if (tdep->ppc_fp0_regnum >= 0) |
| 359 | for (regno = 0; regno < ppc_num_fprs; regno++) |
| 360 | fetch_register (regcache, tdep->ppc_fp0_regnum + regno); |
| 361 | |
| 362 | /* Read special registers. */ |
| 363 | fetch_register (regcache, gdbarch_pc_regnum (gdbarch)); |
| 364 | fetch_register (regcache, tdep->ppc_ps_regnum); |
| 365 | fetch_register (regcache, tdep->ppc_cr_regnum); |
| 366 | fetch_register (regcache, tdep->ppc_lr_regnum); |
| 367 | fetch_register (regcache, tdep->ppc_ctr_regnum); |
| 368 | fetch_register (regcache, tdep->ppc_xer_regnum); |
| 369 | if (tdep->ppc_fpscr_regnum >= 0) |
| 370 | fetch_register (regcache, tdep->ppc_fpscr_regnum); |
| 371 | if (tdep->ppc_mq_regnum >= 0) |
| 372 | fetch_register (regcache, tdep->ppc_mq_regnum); |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | /* Store our register values back into the inferior. |
| 377 | If REGNO is -1, do this for all registers. |
| 378 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 379 | |
| 380 | static void |
| 381 | rs6000_store_inferior_registers (struct target_ops *ops, |
| 382 | struct regcache *regcache, int regno) |
| 383 | { |
| 384 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 385 | if (regno != -1) |
| 386 | store_register (regcache, regno); |
| 387 | |
| 388 | else |
| 389 | { |
| 390 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 391 | |
| 392 | /* Write general purpose registers first. */ |
| 393 | for (regno = tdep->ppc_gp0_regnum; |
| 394 | regno < tdep->ppc_gp0_regnum + ppc_num_gprs; |
| 395 | regno++) |
| 396 | { |
| 397 | store_register (regcache, regno); |
| 398 | } |
| 399 | |
| 400 | /* Write floating point registers. */ |
| 401 | if (tdep->ppc_fp0_regnum >= 0) |
| 402 | for (regno = 0; regno < ppc_num_fprs; regno++) |
| 403 | store_register (regcache, tdep->ppc_fp0_regnum + regno); |
| 404 | |
| 405 | /* Write special registers. */ |
| 406 | store_register (regcache, gdbarch_pc_regnum (gdbarch)); |
| 407 | store_register (regcache, tdep->ppc_ps_regnum); |
| 408 | store_register (regcache, tdep->ppc_cr_regnum); |
| 409 | store_register (regcache, tdep->ppc_lr_regnum); |
| 410 | store_register (regcache, tdep->ppc_ctr_regnum); |
| 411 | store_register (regcache, tdep->ppc_xer_regnum); |
| 412 | if (tdep->ppc_fpscr_regnum >= 0) |
| 413 | store_register (regcache, tdep->ppc_fpscr_regnum); |
| 414 | if (tdep->ppc_mq_regnum >= 0) |
| 415 | store_register (regcache, tdep->ppc_mq_regnum); |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | |
| 420 | /* Attempt a transfer all LEN bytes starting at OFFSET between the |
| 421 | inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer. |
| 422 | Return the number of bytes actually transferred. */ |
| 423 | |
| 424 | static LONGEST |
| 425 | rs6000_xfer_partial (struct target_ops *ops, enum target_object object, |
| 426 | const char *annex, gdb_byte *readbuf, |
| 427 | const gdb_byte *writebuf, |
| 428 | ULONGEST offset, LONGEST len) |
| 429 | { |
| 430 | pid_t pid = ptid_get_pid (inferior_ptid); |
| 431 | int arch64 = ARCH64 (); |
| 432 | |
| 433 | switch (object) |
| 434 | { |
| 435 | case TARGET_OBJECT_MEMORY: |
| 436 | { |
| 437 | union |
| 438 | { |
| 439 | PTRACE_TYPE_RET word; |
| 440 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
| 441 | } buffer; |
| 442 | ULONGEST rounded_offset; |
| 443 | LONGEST partial_len; |
| 444 | |
| 445 | /* Round the start offset down to the next long word |
| 446 | boundary. */ |
| 447 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
| 448 | |
| 449 | /* Since ptrace will transfer a single word starting at that |
| 450 | rounded_offset the partial_len needs to be adjusted down to |
| 451 | that (remember this function only does a single transfer). |
| 452 | Should the required length be even less, adjust it down |
| 453 | again. */ |
| 454 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; |
| 455 | if (partial_len > len) |
| 456 | partial_len = len; |
| 457 | |
| 458 | if (writebuf) |
| 459 | { |
| 460 | /* If OFFSET:PARTIAL_LEN is smaller than |
| 461 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will |
| 462 | be needed. Read in the entire word. */ |
| 463 | if (rounded_offset < offset |
| 464 | || (offset + partial_len |
| 465 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) |
| 466 | { |
| 467 | /* Need part of initial word -- fetch it. */ |
| 468 | if (arch64) |
| 469 | buffer.word = rs6000_ptrace64 (PT_READ_I, pid, |
| 470 | rounded_offset, 0, NULL); |
| 471 | else |
| 472 | buffer.word = rs6000_ptrace32 (PT_READ_I, pid, |
| 473 | (int *) (uintptr_t) |
| 474 | rounded_offset, |
| 475 | 0, NULL); |
| 476 | } |
| 477 | |
| 478 | /* Copy data to be written over corresponding part of |
| 479 | buffer. */ |
| 480 | memcpy (buffer.byte + (offset - rounded_offset), |
| 481 | writebuf, partial_len); |
| 482 | |
| 483 | errno = 0; |
| 484 | if (arch64) |
| 485 | rs6000_ptrace64 (PT_WRITE_D, pid, |
| 486 | rounded_offset, buffer.word, NULL); |
| 487 | else |
| 488 | rs6000_ptrace32 (PT_WRITE_D, pid, |
| 489 | (int *) (uintptr_t) rounded_offset, |
| 490 | buffer.word, NULL); |
| 491 | if (errno) |
| 492 | return 0; |
| 493 | } |
| 494 | |
| 495 | if (readbuf) |
| 496 | { |
| 497 | errno = 0; |
| 498 | if (arch64) |
| 499 | buffer.word = rs6000_ptrace64 (PT_READ_I, pid, |
| 500 | rounded_offset, 0, NULL); |
| 501 | else |
| 502 | buffer.word = rs6000_ptrace32 (PT_READ_I, pid, |
| 503 | (int *)(uintptr_t)rounded_offset, |
| 504 | 0, NULL); |
| 505 | if (errno) |
| 506 | return 0; |
| 507 | |
| 508 | /* Copy appropriate bytes out of the buffer. */ |
| 509 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), |
| 510 | partial_len); |
| 511 | } |
| 512 | |
| 513 | return partial_len; |
| 514 | } |
| 515 | |
| 516 | default: |
| 517 | return -1; |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | /* Wait for the child specified by PTID to do something. Return the |
| 522 | process ID of the child, or MINUS_ONE_PTID in case of error; store |
| 523 | the status in *OURSTATUS. */ |
| 524 | |
| 525 | static ptid_t |
| 526 | rs6000_wait (struct target_ops *ops, |
| 527 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
| 528 | { |
| 529 | pid_t pid; |
| 530 | int status, save_errno; |
| 531 | |
| 532 | do |
| 533 | { |
| 534 | set_sigint_trap (); |
| 535 | |
| 536 | do |
| 537 | { |
| 538 | pid = waitpid (ptid_get_pid (ptid), &status, 0); |
| 539 | save_errno = errno; |
| 540 | } |
| 541 | while (pid == -1 && errno == EINTR); |
| 542 | |
| 543 | clear_sigint_trap (); |
| 544 | |
| 545 | if (pid == -1) |
| 546 | { |
| 547 | fprintf_unfiltered (gdb_stderr, |
| 548 | _("Child process unexpectedly missing: %s.\n"), |
| 549 | safe_strerror (save_errno)); |
| 550 | |
| 551 | /* Claim it exited with unknown signal. */ |
| 552 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 553 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; |
| 554 | return inferior_ptid; |
| 555 | } |
| 556 | |
| 557 | /* Ignore terminated detached child processes. */ |
| 558 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) |
| 559 | pid = -1; |
| 560 | } |
| 561 | while (pid == -1); |
| 562 | |
| 563 | /* AIX has a couple of strange returns from wait(). */ |
| 564 | |
| 565 | /* stop after load" status. */ |
| 566 | if (status == 0x57c) |
| 567 | ourstatus->kind = TARGET_WAITKIND_LOADED; |
| 568 | /* signal 0. I have no idea why wait(2) returns with this status word. */ |
| 569 | else if (status == 0x7f) |
| 570 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| 571 | /* A normal waitstatus. Let the usual macros deal with it. */ |
| 572 | else |
| 573 | store_waitstatus (ourstatus, status); |
| 574 | |
| 575 | return pid_to_ptid (pid); |
| 576 | } |
| 577 | |
| 578 | /* Execute one dummy breakpoint instruction. This way we give the kernel |
| 579 | a chance to do some housekeeping and update inferior's internal data, |
| 580 | including u_area. */ |
| 581 | |
| 582 | static void |
| 583 | exec_one_dummy_insn (struct regcache *regcache) |
| 584 | { |
| 585 | #define DUMMY_INSN_ADDR AIX_TEXT_SEGMENT_BASE+0x200 |
| 586 | |
| 587 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 588 | int ret, status, pid; |
| 589 | CORE_ADDR prev_pc; |
| 590 | void *bp; |
| 591 | |
| 592 | /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We |
| 593 | assume that this address will never be executed again by the real |
| 594 | code. */ |
| 595 | |
| 596 | bp = deprecated_insert_raw_breakpoint (gdbarch, NULL, DUMMY_INSN_ADDR); |
| 597 | |
| 598 | /* You might think this could be done with a single ptrace call, and |
| 599 | you'd be correct for just about every platform I've ever worked |
| 600 | on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up -- |
| 601 | the inferior never hits the breakpoint (it's also worth noting |
| 602 | powerpc-ibm-aix4.1.3 works correctly). */ |
| 603 | prev_pc = regcache_read_pc (regcache); |
| 604 | regcache_write_pc (regcache, DUMMY_INSN_ADDR); |
| 605 | if (ARCH64 ()) |
| 606 | ret = rs6000_ptrace64 (PT_CONTINUE, PIDGET (inferior_ptid), 1, 0, NULL); |
| 607 | else |
| 608 | ret = rs6000_ptrace32 (PT_CONTINUE, PIDGET (inferior_ptid), |
| 609 | (int *) 1, 0, NULL); |
| 610 | |
| 611 | if (ret != 0) |
| 612 | perror (_("pt_continue")); |
| 613 | |
| 614 | do |
| 615 | { |
| 616 | pid = waitpid (PIDGET (inferior_ptid), &status, 0); |
| 617 | } |
| 618 | while (pid != PIDGET (inferior_ptid)); |
| 619 | |
| 620 | regcache_write_pc (regcache, prev_pc); |
| 621 | deprecated_remove_raw_breakpoint (gdbarch, bp); |
| 622 | } |
| 623 | \f |
| 624 | |
| 625 | /* Copy information about text and data sections from LDI to VP for a 64-bit |
| 626 | process if ARCH64 and for a 32-bit process otherwise. */ |
| 627 | |
| 628 | static void |
| 629 | vmap_secs (struct vmap *vp, LdInfo *ldi, int arch64) |
| 630 | { |
| 631 | if (arch64) |
| 632 | { |
| 633 | vp->tstart = (CORE_ADDR) ldi->l64.ldinfo_textorg; |
| 634 | vp->tend = vp->tstart + ldi->l64.ldinfo_textsize; |
| 635 | vp->dstart = (CORE_ADDR) ldi->l64.ldinfo_dataorg; |
| 636 | vp->dend = vp->dstart + ldi->l64.ldinfo_datasize; |
| 637 | } |
| 638 | else |
| 639 | { |
| 640 | vp->tstart = (unsigned long) ldi->l32.ldinfo_textorg; |
| 641 | vp->tend = vp->tstart + ldi->l32.ldinfo_textsize; |
| 642 | vp->dstart = (unsigned long) ldi->l32.ldinfo_dataorg; |
| 643 | vp->dend = vp->dstart + ldi->l32.ldinfo_datasize; |
| 644 | } |
| 645 | |
| 646 | /* The run time loader maps the file header in addition to the text |
| 647 | section and returns a pointer to the header in ldinfo_textorg. |
| 648 | Adjust the text start address to point to the real start address |
| 649 | of the text section. */ |
| 650 | vp->tstart += vp->toffs; |
| 651 | } |
| 652 | |
| 653 | /* Handle symbol translation on vmapping. */ |
| 654 | |
| 655 | static void |
| 656 | vmap_symtab (struct vmap *vp) |
| 657 | { |
| 658 | struct objfile *objfile; |
| 659 | struct section_offsets *new_offsets; |
| 660 | int i; |
| 661 | |
| 662 | objfile = vp->objfile; |
| 663 | if (objfile == NULL) |
| 664 | { |
| 665 | /* OK, it's not an objfile we opened ourselves. |
| 666 | Currently, that can only happen with the exec file, so |
| 667 | relocate the symbols for the symfile. */ |
| 668 | if (symfile_objfile == NULL) |
| 669 | return; |
| 670 | objfile = symfile_objfile; |
| 671 | } |
| 672 | else if (!vp->loaded) |
| 673 | /* If symbols are not yet loaded, offsets are not yet valid. */ |
| 674 | return; |
| 675 | |
| 676 | new_offsets = |
| 677 | (struct section_offsets *) |
| 678 | alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); |
| 679 | |
| 680 | for (i = 0; i < objfile->num_sections; ++i) |
| 681 | new_offsets->offsets[i] = ANOFFSET (objfile->section_offsets, i); |
| 682 | |
| 683 | /* The symbols in the object file are linked to the VMA of the section, |
| 684 | relocate them VMA relative. */ |
| 685 | new_offsets->offsets[SECT_OFF_TEXT (objfile)] = vp->tstart - vp->tvma; |
| 686 | new_offsets->offsets[SECT_OFF_DATA (objfile)] = vp->dstart - vp->dvma; |
| 687 | new_offsets->offsets[SECT_OFF_BSS (objfile)] = vp->dstart - vp->dvma; |
| 688 | |
| 689 | objfile_relocate (objfile, new_offsets); |
| 690 | } |
| 691 | \f |
| 692 | /* Add symbols for an objfile. */ |
| 693 | |
| 694 | static int |
| 695 | objfile_symbol_add (void *arg) |
| 696 | { |
| 697 | struct objfile *obj = (struct objfile *) arg; |
| 698 | |
| 699 | syms_from_objfile (obj, NULL, 0, 0, 0); |
| 700 | new_symfile_objfile (obj, 0); |
| 701 | return 1; |
| 702 | } |
| 703 | |
| 704 | /* Add symbols for a vmap. Return zero upon error. */ |
| 705 | |
| 706 | int |
| 707 | vmap_add_symbols (struct vmap *vp) |
| 708 | { |
| 709 | if (catch_errors (objfile_symbol_add, vp->objfile, |
| 710 | "Error while reading shared library symbols:\n", |
| 711 | RETURN_MASK_ALL)) |
| 712 | { |
| 713 | /* Note this is only done if symbol reading was successful. */ |
| 714 | vp->loaded = 1; |
| 715 | vmap_symtab (vp); |
| 716 | return 1; |
| 717 | } |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | /* Add a new vmap entry based on ldinfo() information. |
| 722 | |
| 723 | If ldi->ldinfo_fd is not valid (e.g. this struct ld_info is from a |
| 724 | core file), the caller should set it to -1, and we will open the file. |
| 725 | |
| 726 | Return the vmap new entry. */ |
| 727 | |
| 728 | static struct vmap * |
| 729 | add_vmap (LdInfo *ldi) |
| 730 | { |
| 731 | bfd *abfd, *last; |
| 732 | char *mem, *objname, *filename; |
| 733 | struct objfile *obj; |
| 734 | struct vmap *vp; |
| 735 | int fd; |
| 736 | ARCH64_DECL (arch64); |
| 737 | |
| 738 | /* This ldi structure was allocated using alloca() in |
| 739 | xcoff_relocate_symtab(). Now we need to have persistent object |
| 740 | and member names, so we should save them. */ |
| 741 | |
| 742 | filename = LDI_FILENAME (ldi, arch64); |
| 743 | mem = filename + strlen (filename) + 1; |
| 744 | mem = xstrdup (mem); |
| 745 | objname = xstrdup (filename); |
| 746 | |
| 747 | fd = LDI_FD (ldi, arch64); |
| 748 | if (fd < 0) |
| 749 | /* Note that this opens it once for every member; a possible |
| 750 | enhancement would be to only open it once for every object. */ |
| 751 | abfd = bfd_openr (objname, gnutarget); |
| 752 | else |
| 753 | abfd = bfd_fdopenr (objname, gnutarget, fd); |
| 754 | if (!abfd) |
| 755 | { |
| 756 | warning (_("Could not open `%s' as an executable file: %s"), |
| 757 | objname, bfd_errmsg (bfd_get_error ())); |
| 758 | return NULL; |
| 759 | } |
| 760 | |
| 761 | /* Make sure we have an object file. */ |
| 762 | |
| 763 | if (bfd_check_format (abfd, bfd_object)) |
| 764 | vp = map_vmap (abfd, 0); |
| 765 | |
| 766 | else if (bfd_check_format (abfd, bfd_archive)) |
| 767 | { |
| 768 | last = 0; |
| 769 | /* FIXME??? am I tossing BFDs? bfd? */ |
| 770 | while ((last = bfd_openr_next_archived_file (abfd, last))) |
| 771 | if (strcmp (mem, last->filename) == 0) |
| 772 | break; |
| 773 | |
| 774 | if (!last) |
| 775 | { |
| 776 | warning (_("\"%s\": member \"%s\" missing."), objname, mem); |
| 777 | bfd_close (abfd); |
| 778 | return NULL; |
| 779 | } |
| 780 | |
| 781 | if (!bfd_check_format (last, bfd_object)) |
| 782 | { |
| 783 | warning (_("\"%s\": member \"%s\" not in executable format: %s."), |
| 784 | objname, mem, bfd_errmsg (bfd_get_error ())); |
| 785 | bfd_close (last); |
| 786 | bfd_close (abfd); |
| 787 | return NULL; |
| 788 | } |
| 789 | |
| 790 | vp = map_vmap (last, abfd); |
| 791 | } |
| 792 | else |
| 793 | { |
| 794 | warning (_("\"%s\": not in executable format: %s."), |
| 795 | objname, bfd_errmsg (bfd_get_error ())); |
| 796 | bfd_close (abfd); |
| 797 | return NULL; |
| 798 | } |
| 799 | obj = allocate_objfile (vp->bfd, 0); |
| 800 | vp->objfile = obj; |
| 801 | |
| 802 | /* Always add symbols for the main objfile. */ |
| 803 | if (vp == vmap || auto_solib_add) |
| 804 | vmap_add_symbols (vp); |
| 805 | return vp; |
| 806 | } |
| 807 | \f |
| 808 | /* update VMAP info with ldinfo() information |
| 809 | Input is ptr to ldinfo() results. */ |
| 810 | |
| 811 | static void |
| 812 | vmap_ldinfo (LdInfo *ldi) |
| 813 | { |
| 814 | struct stat ii, vi; |
| 815 | struct vmap *vp; |
| 816 | int got_one, retried; |
| 817 | int got_exec_file = 0; |
| 818 | uint next; |
| 819 | int arch64 = ARCH64 (); |
| 820 | |
| 821 | /* For each *ldi, see if we have a corresponding *vp. |
| 822 | If so, update the mapping, and symbol table. |
| 823 | If not, add an entry and symbol table. */ |
| 824 | |
| 825 | do |
| 826 | { |
| 827 | char *name = LDI_FILENAME (ldi, arch64); |
| 828 | char *memb = name + strlen (name) + 1; |
| 829 | int fd = LDI_FD (ldi, arch64); |
| 830 | |
| 831 | retried = 0; |
| 832 | |
| 833 | if (fstat (fd, &ii) < 0) |
| 834 | { |
| 835 | /* The kernel sets ld_info to -1, if the process is still using the |
| 836 | object, and the object is removed. Keep the symbol info for the |
| 837 | removed object and issue a warning. */ |
| 838 | warning (_("%s (fd=%d) has disappeared, keeping its symbols"), |
| 839 | name, fd); |
| 840 | continue; |
| 841 | } |
| 842 | retry: |
| 843 | for (got_one = 0, vp = vmap; vp; vp = vp->nxt) |
| 844 | { |
| 845 | struct objfile *objfile; |
| 846 | |
| 847 | /* First try to find a `vp', which is the same as in ldinfo. |
| 848 | If not the same, just continue and grep the next `vp'. If same, |
| 849 | relocate its tstart, tend, dstart, dend values. If no such `vp' |
| 850 | found, get out of this for loop, add this ldi entry as a new vmap |
| 851 | (add_vmap) and come back, find its `vp' and so on... */ |
| 852 | |
| 853 | /* The filenames are not always sufficient to match on. */ |
| 854 | |
| 855 | if ((name[0] == '/' && strcmp (name, vp->name) != 0) |
| 856 | || (memb[0] && strcmp (memb, vp->member) != 0)) |
| 857 | continue; |
| 858 | |
| 859 | /* See if we are referring to the same file. |
| 860 | We have to check objfile->obfd, symfile.c:reread_symbols might |
| 861 | have updated the obfd after a change. */ |
| 862 | objfile = vp->objfile == NULL ? symfile_objfile : vp->objfile; |
| 863 | if (objfile == NULL |
| 864 | || objfile->obfd == NULL |
| 865 | || bfd_stat (objfile->obfd, &vi) < 0) |
| 866 | { |
| 867 | warning (_("Unable to stat %s, keeping its symbols"), name); |
| 868 | continue; |
| 869 | } |
| 870 | |
| 871 | if (ii.st_dev != vi.st_dev || ii.st_ino != vi.st_ino) |
| 872 | continue; |
| 873 | |
| 874 | if (!retried) |
| 875 | close (fd); |
| 876 | |
| 877 | ++got_one; |
| 878 | |
| 879 | /* Found a corresponding VMAP. Remap! */ |
| 880 | |
| 881 | vmap_secs (vp, ldi, arch64); |
| 882 | |
| 883 | /* The objfile is only NULL for the exec file. */ |
| 884 | if (vp->objfile == NULL) |
| 885 | got_exec_file = 1; |
| 886 | |
| 887 | /* relocate symbol table(s). */ |
| 888 | vmap_symtab (vp); |
| 889 | |
| 890 | /* Announce new object files. Doing this after symbol relocation |
| 891 | makes aix-thread.c's job easier. */ |
| 892 | if (vp->objfile) |
| 893 | observer_notify_new_objfile (vp->objfile); |
| 894 | |
| 895 | /* There may be more, so we don't break out of the loop. */ |
| 896 | } |
| 897 | |
| 898 | /* If there was no matching *vp, we must perforce create the |
| 899 | sucker(s). */ |
| 900 | if (!got_one && !retried) |
| 901 | { |
| 902 | add_vmap (ldi); |
| 903 | ++retried; |
| 904 | goto retry; |
| 905 | } |
| 906 | } |
| 907 | while ((next = LDI_NEXT (ldi, arch64)) |
| 908 | && (ldi = (void *) (next + (char *) ldi))); |
| 909 | |
| 910 | /* If we don't find the symfile_objfile anywhere in the ldinfo, it |
| 911 | is unlikely that the symbol file is relocated to the proper |
| 912 | address. And we might have attached to a process which is |
| 913 | running a different copy of the same executable. */ |
| 914 | if (symfile_objfile != NULL && !got_exec_file) |
| 915 | { |
| 916 | warning (_("Symbol file %s\nis not mapped; discarding it.\n\ |
| 917 | If in fact that file has symbols which the mapped files listed by\n\ |
| 918 | \"info files\" lack, you can load symbols with the \"symbol-file\" or\n\ |
| 919 | \"add-symbol-file\" commands (note that you must take care of relocating\n\ |
| 920 | symbols to the proper address)."), |
| 921 | symfile_objfile->name); |
| 922 | free_objfile (symfile_objfile); |
| 923 | gdb_assert (symfile_objfile == NULL); |
| 924 | } |
| 925 | breakpoint_re_set (); |
| 926 | } |
| 927 | \f |
| 928 | /* As well as symbol tables, exec_sections need relocation. After |
| 929 | the inferior process' termination, there will be a relocated symbol |
| 930 | table exist with no corresponding inferior process. At that time, we |
| 931 | need to use `exec' bfd, rather than the inferior process's memory space |
| 932 | to look up symbols. |
| 933 | |
| 934 | `exec_sections' need to be relocated only once, as long as the exec |
| 935 | file remains unchanged. */ |
| 936 | |
| 937 | static void |
| 938 | vmap_exec (void) |
| 939 | { |
| 940 | static bfd *execbfd; |
| 941 | int i; |
| 942 | struct target_section_table *table = target_get_section_table (&exec_ops); |
| 943 | |
| 944 | if (execbfd == exec_bfd) |
| 945 | return; |
| 946 | |
| 947 | execbfd = exec_bfd; |
| 948 | |
| 949 | if (!vmap || !table->sections) |
| 950 | error (_("vmap_exec: vmap or table->sections == 0.")); |
| 951 | |
| 952 | for (i = 0; &table->sections[i] < table->sections_end; i++) |
| 953 | { |
| 954 | if (strcmp (".text", table->sections[i].the_bfd_section->name) == 0) |
| 955 | { |
| 956 | table->sections[i].addr += vmap->tstart - vmap->tvma; |
| 957 | table->sections[i].endaddr += vmap->tstart - vmap->tvma; |
| 958 | } |
| 959 | else if (strcmp (".data", table->sections[i].the_bfd_section->name) == 0) |
| 960 | { |
| 961 | table->sections[i].addr += vmap->dstart - vmap->dvma; |
| 962 | table->sections[i].endaddr += vmap->dstart - vmap->dvma; |
| 963 | } |
| 964 | else if (strcmp (".bss", table->sections[i].the_bfd_section->name) == 0) |
| 965 | { |
| 966 | table->sections[i].addr += vmap->dstart - vmap->dvma; |
| 967 | table->sections[i].endaddr += vmap->dstart - vmap->dvma; |
| 968 | } |
| 969 | } |
| 970 | } |
| 971 | |
| 972 | /* Set the current architecture from the host running GDB. Called when |
| 973 | starting a child process. */ |
| 974 | |
| 975 | static void (*super_create_inferior) (struct target_ops *,char *exec_file, |
| 976 | char *allargs, char **env, int from_tty); |
| 977 | static void |
| 978 | rs6000_create_inferior (struct target_ops * ops, char *exec_file, |
| 979 | char *allargs, char **env, int from_tty) |
| 980 | { |
| 981 | enum bfd_architecture arch; |
| 982 | unsigned long mach; |
| 983 | bfd abfd; |
| 984 | struct gdbarch_info info; |
| 985 | |
| 986 | super_create_inferior (ops, exec_file, allargs, env, from_tty); |
| 987 | |
| 988 | if (__power_rs ()) |
| 989 | { |
| 990 | arch = bfd_arch_rs6000; |
| 991 | mach = bfd_mach_rs6k; |
| 992 | } |
| 993 | else |
| 994 | { |
| 995 | arch = bfd_arch_powerpc; |
| 996 | mach = bfd_mach_ppc; |
| 997 | } |
| 998 | |
| 999 | /* FIXME: schauer/2002-02-25: |
| 1000 | We don't know if we are executing a 32 or 64 bit executable, |
| 1001 | and have no way to pass the proper word size to rs6000_gdbarch_init. |
| 1002 | So we have to avoid switching to a new architecture, if the architecture |
| 1003 | matches already. |
| 1004 | Blindly calling rs6000_gdbarch_init used to work in older versions of |
| 1005 | GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to |
| 1006 | determine the wordsize. */ |
| 1007 | if (exec_bfd) |
| 1008 | { |
| 1009 | const struct bfd_arch_info *exec_bfd_arch_info; |
| 1010 | |
| 1011 | exec_bfd_arch_info = bfd_get_arch_info (exec_bfd); |
| 1012 | if (arch == exec_bfd_arch_info->arch) |
| 1013 | return; |
| 1014 | } |
| 1015 | |
| 1016 | bfd_default_set_arch_mach (&abfd, arch, mach); |
| 1017 | |
| 1018 | gdbarch_info_init (&info); |
| 1019 | info.bfd_arch_info = bfd_get_arch_info (&abfd); |
| 1020 | info.abfd = exec_bfd; |
| 1021 | |
| 1022 | if (!gdbarch_update_p (info)) |
| 1023 | internal_error (__FILE__, __LINE__, |
| 1024 | _("rs6000_create_inferior: failed " |
| 1025 | "to select architecture")); |
| 1026 | } |
| 1027 | |
| 1028 | \f |
| 1029 | /* xcoff_relocate_symtab - hook for symbol table relocation. |
| 1030 | |
| 1031 | This is only applicable to live processes, and is a no-op when |
| 1032 | debugging a core file. */ |
| 1033 | |
| 1034 | void |
| 1035 | xcoff_relocate_symtab (unsigned int pid) |
| 1036 | { |
| 1037 | int load_segs = 64; /* number of load segments */ |
| 1038 | int rc; |
| 1039 | LdInfo *ldi = NULL; |
| 1040 | int arch64 = ARCH64 (); |
| 1041 | int ldisize = arch64 ? sizeof (ldi->l64) : sizeof (ldi->l32); |
| 1042 | int size; |
| 1043 | |
| 1044 | /* Nothing to do if we are debugging a core file. */ |
| 1045 | if (!target_has_execution) |
| 1046 | return; |
| 1047 | |
| 1048 | do |
| 1049 | { |
| 1050 | size = load_segs * ldisize; |
| 1051 | ldi = (void *) xrealloc (ldi, size); |
| 1052 | |
| 1053 | #if 0 |
| 1054 | /* According to my humble theory, AIX has some timing problems and |
| 1055 | when the user stack grows, kernel doesn't update stack info in time |
| 1056 | and ptrace calls step on user stack. That is why we sleep here a |
| 1057 | little, and give kernel to update its internals. */ |
| 1058 | usleep (36000); |
| 1059 | #endif |
| 1060 | |
| 1061 | if (arch64) |
| 1062 | rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi, size, NULL); |
| 1063 | else |
| 1064 | rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi, size, NULL); |
| 1065 | |
| 1066 | if (rc == -1) |
| 1067 | { |
| 1068 | if (errno == ENOMEM) |
| 1069 | load_segs *= 2; |
| 1070 | else |
| 1071 | perror_with_name (_("ptrace ldinfo")); |
| 1072 | } |
| 1073 | else |
| 1074 | { |
| 1075 | vmap_ldinfo (ldi); |
| 1076 | vmap_exec (); /* relocate the exec and core sections as well. */ |
| 1077 | } |
| 1078 | } while (rc == -1); |
| 1079 | if (ldi) |
| 1080 | xfree (ldi); |
| 1081 | } |
| 1082 | \f |
| 1083 | /* Core file stuff. */ |
| 1084 | |
| 1085 | /* Relocate symtabs and read in shared library info, based on symbols |
| 1086 | from the core file. */ |
| 1087 | |
| 1088 | void |
| 1089 | xcoff_relocate_core (struct target_ops *target) |
| 1090 | { |
| 1091 | struct bfd_section *ldinfo_sec; |
| 1092 | int offset = 0; |
| 1093 | LdInfo *ldi; |
| 1094 | struct vmap *vp; |
| 1095 | int arch64 = ARCH64 (); |
| 1096 | |
| 1097 | /* Size of a struct ld_info except for the variable-length filename. */ |
| 1098 | int nonfilesz = (int)LDI_FILENAME ((LdInfo *)0, arch64); |
| 1099 | |
| 1100 | /* Allocated size of buffer. */ |
| 1101 | int buffer_size = nonfilesz; |
| 1102 | char *buffer = xmalloc (buffer_size); |
| 1103 | struct cleanup *old = make_cleanup (free_current_contents, &buffer); |
| 1104 | |
| 1105 | ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo"); |
| 1106 | if (ldinfo_sec == NULL) |
| 1107 | { |
| 1108 | bfd_err: |
| 1109 | fprintf_filtered (gdb_stderr, "Couldn't get ldinfo from core file: %s\n", |
| 1110 | bfd_errmsg (bfd_get_error ())); |
| 1111 | do_cleanups (old); |
| 1112 | return; |
| 1113 | } |
| 1114 | do |
| 1115 | { |
| 1116 | int i; |
| 1117 | int names_found = 0; |
| 1118 | |
| 1119 | /* Read in everything but the name. */ |
| 1120 | if (bfd_get_section_contents (core_bfd, ldinfo_sec, buffer, |
| 1121 | offset, nonfilesz) == 0) |
| 1122 | goto bfd_err; |
| 1123 | |
| 1124 | /* Now the name. */ |
| 1125 | i = nonfilesz; |
| 1126 | do |
| 1127 | { |
| 1128 | if (i == buffer_size) |
| 1129 | { |
| 1130 | buffer_size *= 2; |
| 1131 | buffer = xrealloc (buffer, buffer_size); |
| 1132 | } |
| 1133 | if (bfd_get_section_contents (core_bfd, ldinfo_sec, &buffer[i], |
| 1134 | offset + i, 1) == 0) |
| 1135 | goto bfd_err; |
| 1136 | if (buffer[i++] == '\0') |
| 1137 | ++names_found; |
| 1138 | } |
| 1139 | while (names_found < 2); |
| 1140 | |
| 1141 | ldi = (LdInfo *) buffer; |
| 1142 | |
| 1143 | /* Can't use a file descriptor from the core file; need to open it. */ |
| 1144 | if (arch64) |
| 1145 | ldi->l64.ldinfo_fd = -1; |
| 1146 | else |
| 1147 | ldi->l32.ldinfo_fd = -1; |
| 1148 | |
| 1149 | /* The first ldinfo is for the exec file, allocated elsewhere. */ |
| 1150 | if (offset == 0 && vmap != NULL) |
| 1151 | vp = vmap; |
| 1152 | else |
| 1153 | vp = add_vmap (ldi); |
| 1154 | |
| 1155 | /* Process next shared library upon error. */ |
| 1156 | offset += LDI_NEXT (ldi, arch64); |
| 1157 | if (vp == NULL) |
| 1158 | continue; |
| 1159 | |
| 1160 | vmap_secs (vp, ldi, arch64); |
| 1161 | |
| 1162 | /* Unless this is the exec file, |
| 1163 | add our sections to the section table for the core target. */ |
| 1164 | if (vp != vmap) |
| 1165 | { |
| 1166 | struct target_section *stp; |
| 1167 | |
| 1168 | stp = deprecated_core_resize_section_table (2); |
| 1169 | |
| 1170 | stp->bfd = vp->bfd; |
| 1171 | stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".text"); |
| 1172 | stp->addr = vp->tstart; |
| 1173 | stp->endaddr = vp->tend; |
| 1174 | stp++; |
| 1175 | |
| 1176 | stp->bfd = vp->bfd; |
| 1177 | stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".data"); |
| 1178 | stp->addr = vp->dstart; |
| 1179 | stp->endaddr = vp->dend; |
| 1180 | } |
| 1181 | |
| 1182 | vmap_symtab (vp); |
| 1183 | |
| 1184 | if (vp != vmap && vp->objfile) |
| 1185 | observer_notify_new_objfile (vp->objfile); |
| 1186 | } |
| 1187 | while (LDI_NEXT (ldi, arch64) != 0); |
| 1188 | vmap_exec (); |
| 1189 | breakpoint_re_set (); |
| 1190 | do_cleanups (old); |
| 1191 | } |
| 1192 | \f |
| 1193 | /* Under AIX, we have to pass the correct TOC pointer to a function |
| 1194 | when calling functions in the inferior. |
| 1195 | We try to find the relative toc offset of the objfile containing PC |
| 1196 | and add the current load address of the data segment from the vmap. */ |
| 1197 | |
| 1198 | static CORE_ADDR |
| 1199 | find_toc_address (CORE_ADDR pc) |
| 1200 | { |
| 1201 | struct vmap *vp; |
| 1202 | |
| 1203 | for (vp = vmap; vp; vp = vp->nxt) |
| 1204 | { |
| 1205 | if (pc >= vp->tstart && pc < vp->tend) |
| 1206 | { |
| 1207 | /* vp->objfile is only NULL for the exec file. */ |
| 1208 | return vp->dstart + xcoff_get_toc_offset (vp->objfile == NULL |
| 1209 | ? symfile_objfile |
| 1210 | : vp->objfile); |
| 1211 | } |
| 1212 | } |
| 1213 | error (_("Unable to find TOC entry for pc %s."), hex_string (pc)); |
| 1214 | } |
| 1215 | \f |
| 1216 | |
| 1217 | void |
| 1218 | _initialize_rs6000_nat (void) |
| 1219 | { |
| 1220 | struct target_ops *t; |
| 1221 | |
| 1222 | t = inf_ptrace_target (); |
| 1223 | t->to_fetch_registers = rs6000_fetch_inferior_registers; |
| 1224 | t->to_store_registers = rs6000_store_inferior_registers; |
| 1225 | t->to_xfer_partial = rs6000_xfer_partial; |
| 1226 | |
| 1227 | super_create_inferior = t->to_create_inferior; |
| 1228 | t->to_create_inferior = rs6000_create_inferior; |
| 1229 | |
| 1230 | t->to_wait = rs6000_wait; |
| 1231 | |
| 1232 | add_target (t); |
| 1233 | |
| 1234 | /* Initialize hook in rs6000-tdep.c for determining the TOC address |
| 1235 | when calling functions in the inferior. */ |
| 1236 | rs6000_find_toc_address_hook = find_toc_address; |
| 1237 | } |