| 1 | /* IBM RS/6000 native-dependent code for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 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 | #include "defs.h" |
| 21 | #include "inferior.h" |
| 22 | #include "target.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "symfile.h" |
| 25 | #include "objfiles.h" |
| 26 | #include "libbfd.h" /* For bfd_default_set_arch_mach (FIXME) */ |
| 27 | #include "bfd.h" |
| 28 | #include "exceptions.h" |
| 29 | #include "gdb-stabs.h" |
| 30 | #include "regcache.h" |
| 31 | #include "arch-utils.h" |
| 32 | #include "inf-child.h" |
| 33 | #include "inf-ptrace.h" |
| 34 | #include "ppc-tdep.h" |
| 35 | #include "rs6000-tdep.h" |
| 36 | #include "rs6000-aix-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/dir.h> |
| 45 | #include <sys/user.h> |
| 46 | #include <signal.h> |
| 47 | #include <sys/ioctl.h> |
| 48 | #include <fcntl.h> |
| 49 | #include <errno.h> |
| 50 | |
| 51 | #include <a.out.h> |
| 52 | #include <sys/file.h> |
| 53 | #include <sys/stat.h> |
| 54 | #include "gdb_bfd.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 | #if defined (__ld_info32) || defined (__ld_info64) |
| 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 | static void exec_one_dummy_insn (struct regcache *); |
| 81 | |
| 82 | static target_xfer_partial_ftype rs6000_xfer_shared_libraries; |
| 83 | |
| 84 | /* Given REGNO, a gdb register number, return the corresponding |
| 85 | number suitable for use as a ptrace() parameter. Return -1 if |
| 86 | there's no suitable mapping. Also, set the int pointed to by |
| 87 | ISFLOAT to indicate whether REGNO is a floating point register. */ |
| 88 | |
| 89 | static int |
| 90 | regmap (struct gdbarch *gdbarch, int regno, int *isfloat) |
| 91 | { |
| 92 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 93 | |
| 94 | *isfloat = 0; |
| 95 | if (tdep->ppc_gp0_regnum <= regno |
| 96 | && regno < tdep->ppc_gp0_regnum + ppc_num_gprs) |
| 97 | return regno; |
| 98 | else if (tdep->ppc_fp0_regnum >= 0 |
| 99 | && tdep->ppc_fp0_regnum <= regno |
| 100 | && regno < tdep->ppc_fp0_regnum + ppc_num_fprs) |
| 101 | { |
| 102 | *isfloat = 1; |
| 103 | return regno - tdep->ppc_fp0_regnum + FPR0; |
| 104 | } |
| 105 | else if (regno == gdbarch_pc_regnum (gdbarch)) |
| 106 | return IAR; |
| 107 | else if (regno == tdep->ppc_ps_regnum) |
| 108 | return MSR; |
| 109 | else if (regno == tdep->ppc_cr_regnum) |
| 110 | return CR; |
| 111 | else if (regno == tdep->ppc_lr_regnum) |
| 112 | return LR; |
| 113 | else if (regno == tdep->ppc_ctr_regnum) |
| 114 | return CTR; |
| 115 | else if (regno == tdep->ppc_xer_regnum) |
| 116 | return XER; |
| 117 | else if (tdep->ppc_fpscr_regnum >= 0 |
| 118 | && regno == tdep->ppc_fpscr_regnum) |
| 119 | return FPSCR; |
| 120 | else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum) |
| 121 | return MQ; |
| 122 | else |
| 123 | return -1; |
| 124 | } |
| 125 | |
| 126 | /* Call ptrace(REQ, ID, ADDR, DATA, BUF). */ |
| 127 | |
| 128 | static int |
| 129 | rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf) |
| 130 | { |
| 131 | #ifdef HAVE_PTRACE64 |
| 132 | int ret = ptrace64 (req, id, (uintptr_t) addr, data, buf); |
| 133 | #else |
| 134 | int ret = ptrace (req, id, (int *)addr, data, buf); |
| 135 | #endif |
| 136 | #if 0 |
| 137 | printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n", |
| 138 | req, id, (unsigned int)addr, data, (unsigned int)buf, ret); |
| 139 | #endif |
| 140 | return ret; |
| 141 | } |
| 142 | |
| 143 | /* Call ptracex(REQ, ID, ADDR, DATA, BUF). */ |
| 144 | |
| 145 | static int |
| 146 | rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf) |
| 147 | { |
| 148 | #ifdef ARCH3264 |
| 149 | # ifdef HAVE_PTRACE64 |
| 150 | int ret = ptrace64 (req, id, addr, data, buf); |
| 151 | # else |
| 152 | int ret = ptracex (req, id, addr, data, buf); |
| 153 | # endif |
| 154 | #else |
| 155 | int ret = 0; |
| 156 | #endif |
| 157 | #if 0 |
| 158 | printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n", |
| 159 | req, id, hex_string (addr), data, (unsigned int)buf, ret); |
| 160 | #endif |
| 161 | return ret; |
| 162 | } |
| 163 | |
| 164 | /* Fetch register REGNO from the inferior. */ |
| 165 | |
| 166 | static void |
| 167 | fetch_register (struct regcache *regcache, int regno) |
| 168 | { |
| 169 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 170 | int addr[MAX_REGISTER_SIZE]; |
| 171 | int nr, isfloat; |
| 172 | |
| 173 | /* Retrieved values may be -1, so infer errors from errno. */ |
| 174 | errno = 0; |
| 175 | |
| 176 | nr = regmap (gdbarch, regno, &isfloat); |
| 177 | |
| 178 | /* Floating-point registers. */ |
| 179 | if (isfloat) |
| 180 | rs6000_ptrace32 (PT_READ_FPR, ptid_get_pid (inferior_ptid), addr, nr, 0); |
| 181 | |
| 182 | /* Bogus register number. */ |
| 183 | else if (nr < 0) |
| 184 | { |
| 185 | if (regno >= gdbarch_num_regs (gdbarch)) |
| 186 | fprintf_unfiltered (gdb_stderr, |
| 187 | "gdb error: register no %d not implemented.\n", |
| 188 | regno); |
| 189 | return; |
| 190 | } |
| 191 | |
| 192 | /* Fixed-point registers. */ |
| 193 | else |
| 194 | { |
| 195 | if (!ARCH64 ()) |
| 196 | *addr = rs6000_ptrace32 (PT_READ_GPR, ptid_get_pid (inferior_ptid), |
| 197 | (int *) nr, 0, 0); |
| 198 | else |
| 199 | { |
| 200 | /* PT_READ_GPR requires the buffer parameter to point to long long, |
| 201 | even if the register is really only 32 bits. */ |
| 202 | long long buf; |
| 203 | rs6000_ptrace64 (PT_READ_GPR, ptid_get_pid (inferior_ptid), |
| 204 | nr, 0, &buf); |
| 205 | if (register_size (gdbarch, regno) == 8) |
| 206 | memcpy (addr, &buf, 8); |
| 207 | else |
| 208 | *addr = buf; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | if (!errno) |
| 213 | regcache_raw_supply (regcache, regno, (char *) addr); |
| 214 | else |
| 215 | { |
| 216 | #if 0 |
| 217 | /* FIXME: this happens 3 times at the start of each 64-bit program. */ |
| 218 | perror (_("ptrace read")); |
| 219 | #endif |
| 220 | errno = 0; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | /* Store register REGNO back into the inferior. */ |
| 225 | |
| 226 | static void |
| 227 | store_register (struct regcache *regcache, int regno) |
| 228 | { |
| 229 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 230 | int addr[MAX_REGISTER_SIZE]; |
| 231 | int nr, isfloat; |
| 232 | |
| 233 | /* Fetch the register's value from the register cache. */ |
| 234 | regcache_raw_collect (regcache, regno, addr); |
| 235 | |
| 236 | /* -1 can be a successful return value, so infer errors from errno. */ |
| 237 | errno = 0; |
| 238 | |
| 239 | nr = regmap (gdbarch, regno, &isfloat); |
| 240 | |
| 241 | /* Floating-point registers. */ |
| 242 | if (isfloat) |
| 243 | rs6000_ptrace32 (PT_WRITE_FPR, ptid_get_pid (inferior_ptid), addr, nr, 0); |
| 244 | |
| 245 | /* Bogus register number. */ |
| 246 | else if (nr < 0) |
| 247 | { |
| 248 | if (regno >= gdbarch_num_regs (gdbarch)) |
| 249 | fprintf_unfiltered (gdb_stderr, |
| 250 | "gdb error: register no %d not implemented.\n", |
| 251 | regno); |
| 252 | } |
| 253 | |
| 254 | /* Fixed-point registers. */ |
| 255 | else |
| 256 | { |
| 257 | if (regno == gdbarch_sp_regnum (gdbarch)) |
| 258 | /* Execute one dummy instruction (which is a breakpoint) in inferior |
| 259 | process to give kernel a chance to do internal housekeeping. |
| 260 | Otherwise the following ptrace(2) calls will mess up user stack |
| 261 | since kernel will get confused about the bottom of the stack |
| 262 | (%sp). */ |
| 263 | exec_one_dummy_insn (regcache); |
| 264 | |
| 265 | /* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors, |
| 266 | the register's value is passed by value, but for 64-bit inferiors, |
| 267 | the address of a buffer containing the value is passed. */ |
| 268 | if (!ARCH64 ()) |
| 269 | rs6000_ptrace32 (PT_WRITE_GPR, ptid_get_pid (inferior_ptid), |
| 270 | (int *) nr, *addr, 0); |
| 271 | else |
| 272 | { |
| 273 | /* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte |
| 274 | area, even if the register is really only 32 bits. */ |
| 275 | long long buf; |
| 276 | if (register_size (gdbarch, regno) == 8) |
| 277 | memcpy (&buf, addr, 8); |
| 278 | else |
| 279 | buf = *addr; |
| 280 | rs6000_ptrace64 (PT_WRITE_GPR, ptid_get_pid (inferior_ptid), |
| 281 | nr, 0, &buf); |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | if (errno) |
| 286 | { |
| 287 | perror (_("ptrace write")); |
| 288 | errno = 0; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | /* Read from the inferior all registers if REGNO == -1 and just register |
| 293 | REGNO otherwise. */ |
| 294 | |
| 295 | static void |
| 296 | rs6000_fetch_inferior_registers (struct target_ops *ops, |
| 297 | struct regcache *regcache, int regno) |
| 298 | { |
| 299 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 300 | if (regno != -1) |
| 301 | fetch_register (regcache, regno); |
| 302 | |
| 303 | else |
| 304 | { |
| 305 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 306 | |
| 307 | /* Read 32 general purpose registers. */ |
| 308 | for (regno = tdep->ppc_gp0_regnum; |
| 309 | regno < tdep->ppc_gp0_regnum + ppc_num_gprs; |
| 310 | regno++) |
| 311 | { |
| 312 | fetch_register (regcache, regno); |
| 313 | } |
| 314 | |
| 315 | /* Read general purpose floating point registers. */ |
| 316 | if (tdep->ppc_fp0_regnum >= 0) |
| 317 | for (regno = 0; regno < ppc_num_fprs; regno++) |
| 318 | fetch_register (regcache, tdep->ppc_fp0_regnum + regno); |
| 319 | |
| 320 | /* Read special registers. */ |
| 321 | fetch_register (regcache, gdbarch_pc_regnum (gdbarch)); |
| 322 | fetch_register (regcache, tdep->ppc_ps_regnum); |
| 323 | fetch_register (regcache, tdep->ppc_cr_regnum); |
| 324 | fetch_register (regcache, tdep->ppc_lr_regnum); |
| 325 | fetch_register (regcache, tdep->ppc_ctr_regnum); |
| 326 | fetch_register (regcache, tdep->ppc_xer_regnum); |
| 327 | if (tdep->ppc_fpscr_regnum >= 0) |
| 328 | fetch_register (regcache, tdep->ppc_fpscr_regnum); |
| 329 | if (tdep->ppc_mq_regnum >= 0) |
| 330 | fetch_register (regcache, tdep->ppc_mq_regnum); |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | /* Store our register values back into the inferior. |
| 335 | If REGNO is -1, do this for all registers. |
| 336 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 337 | |
| 338 | static void |
| 339 | rs6000_store_inferior_registers (struct target_ops *ops, |
| 340 | struct regcache *regcache, int regno) |
| 341 | { |
| 342 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 343 | if (regno != -1) |
| 344 | store_register (regcache, regno); |
| 345 | |
| 346 | else |
| 347 | { |
| 348 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 349 | |
| 350 | /* Write general purpose registers first. */ |
| 351 | for (regno = tdep->ppc_gp0_regnum; |
| 352 | regno < tdep->ppc_gp0_regnum + ppc_num_gprs; |
| 353 | regno++) |
| 354 | { |
| 355 | store_register (regcache, regno); |
| 356 | } |
| 357 | |
| 358 | /* Write floating point registers. */ |
| 359 | if (tdep->ppc_fp0_regnum >= 0) |
| 360 | for (regno = 0; regno < ppc_num_fprs; regno++) |
| 361 | store_register (regcache, tdep->ppc_fp0_regnum + regno); |
| 362 | |
| 363 | /* Write special registers. */ |
| 364 | store_register (regcache, gdbarch_pc_regnum (gdbarch)); |
| 365 | store_register (regcache, tdep->ppc_ps_regnum); |
| 366 | store_register (regcache, tdep->ppc_cr_regnum); |
| 367 | store_register (regcache, tdep->ppc_lr_regnum); |
| 368 | store_register (regcache, tdep->ppc_ctr_regnum); |
| 369 | store_register (regcache, tdep->ppc_xer_regnum); |
| 370 | if (tdep->ppc_fpscr_regnum >= 0) |
| 371 | store_register (regcache, tdep->ppc_fpscr_regnum); |
| 372 | if (tdep->ppc_mq_regnum >= 0) |
| 373 | store_register (regcache, tdep->ppc_mq_regnum); |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | |
| 378 | /* Attempt a transfer all LEN bytes starting at OFFSET between the |
| 379 | inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer. |
| 380 | Return the number of bytes actually transferred. */ |
| 381 | |
| 382 | static LONGEST |
| 383 | rs6000_xfer_partial (struct target_ops *ops, enum target_object object, |
| 384 | const char *annex, gdb_byte *readbuf, |
| 385 | const gdb_byte *writebuf, |
| 386 | ULONGEST offset, ULONGEST len) |
| 387 | { |
| 388 | pid_t pid = ptid_get_pid (inferior_ptid); |
| 389 | int arch64 = ARCH64 (); |
| 390 | |
| 391 | switch (object) |
| 392 | { |
| 393 | case TARGET_OBJECT_LIBRARIES_AIX: |
| 394 | return rs6000_xfer_shared_libraries (ops, object, annex, |
| 395 | readbuf, writebuf, |
| 396 | offset, len); |
| 397 | case TARGET_OBJECT_MEMORY: |
| 398 | { |
| 399 | union |
| 400 | { |
| 401 | PTRACE_TYPE_RET word; |
| 402 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
| 403 | } buffer; |
| 404 | ULONGEST rounded_offset; |
| 405 | LONGEST partial_len; |
| 406 | |
| 407 | /* Round the start offset down to the next long word |
| 408 | boundary. */ |
| 409 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
| 410 | |
| 411 | /* Since ptrace will transfer a single word starting at that |
| 412 | rounded_offset the partial_len needs to be adjusted down to |
| 413 | that (remember this function only does a single transfer). |
| 414 | Should the required length be even less, adjust it down |
| 415 | again. */ |
| 416 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; |
| 417 | if (partial_len > len) |
| 418 | partial_len = len; |
| 419 | |
| 420 | if (writebuf) |
| 421 | { |
| 422 | /* If OFFSET:PARTIAL_LEN is smaller than |
| 423 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will |
| 424 | be needed. Read in the entire word. */ |
| 425 | if (rounded_offset < offset |
| 426 | || (offset + partial_len |
| 427 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) |
| 428 | { |
| 429 | /* Need part of initial word -- fetch it. */ |
| 430 | if (arch64) |
| 431 | buffer.word = rs6000_ptrace64 (PT_READ_I, pid, |
| 432 | rounded_offset, 0, NULL); |
| 433 | else |
| 434 | buffer.word = rs6000_ptrace32 (PT_READ_I, pid, |
| 435 | (int *) (uintptr_t) |
| 436 | rounded_offset, |
| 437 | 0, NULL); |
| 438 | } |
| 439 | |
| 440 | /* Copy data to be written over corresponding part of |
| 441 | buffer. */ |
| 442 | memcpy (buffer.byte + (offset - rounded_offset), |
| 443 | writebuf, partial_len); |
| 444 | |
| 445 | errno = 0; |
| 446 | if (arch64) |
| 447 | rs6000_ptrace64 (PT_WRITE_D, pid, |
| 448 | rounded_offset, buffer.word, NULL); |
| 449 | else |
| 450 | rs6000_ptrace32 (PT_WRITE_D, pid, |
| 451 | (int *) (uintptr_t) rounded_offset, |
| 452 | buffer.word, NULL); |
| 453 | if (errno) |
| 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | if (readbuf) |
| 458 | { |
| 459 | errno = 0; |
| 460 | if (arch64) |
| 461 | buffer.word = rs6000_ptrace64 (PT_READ_I, pid, |
| 462 | rounded_offset, 0, NULL); |
| 463 | else |
| 464 | buffer.word = rs6000_ptrace32 (PT_READ_I, pid, |
| 465 | (int *)(uintptr_t)rounded_offset, |
| 466 | 0, NULL); |
| 467 | if (errno) |
| 468 | return 0; |
| 469 | |
| 470 | /* Copy appropriate bytes out of the buffer. */ |
| 471 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), |
| 472 | partial_len); |
| 473 | } |
| 474 | |
| 475 | return partial_len; |
| 476 | } |
| 477 | |
| 478 | default: |
| 479 | return -1; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | /* Wait for the child specified by PTID to do something. Return the |
| 484 | process ID of the child, or MINUS_ONE_PTID in case of error; store |
| 485 | the status in *OURSTATUS. */ |
| 486 | |
| 487 | static ptid_t |
| 488 | rs6000_wait (struct target_ops *ops, |
| 489 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
| 490 | { |
| 491 | pid_t pid; |
| 492 | int status, save_errno; |
| 493 | |
| 494 | do |
| 495 | { |
| 496 | set_sigint_trap (); |
| 497 | |
| 498 | do |
| 499 | { |
| 500 | pid = waitpid (ptid_get_pid (ptid), &status, 0); |
| 501 | save_errno = errno; |
| 502 | } |
| 503 | while (pid == -1 && errno == EINTR); |
| 504 | |
| 505 | clear_sigint_trap (); |
| 506 | |
| 507 | if (pid == -1) |
| 508 | { |
| 509 | fprintf_unfiltered (gdb_stderr, |
| 510 | _("Child process unexpectedly missing: %s.\n"), |
| 511 | safe_strerror (save_errno)); |
| 512 | |
| 513 | /* Claim it exited with unknown signal. */ |
| 514 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 515 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
| 516 | return inferior_ptid; |
| 517 | } |
| 518 | |
| 519 | /* Ignore terminated detached child processes. */ |
| 520 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) |
| 521 | pid = -1; |
| 522 | } |
| 523 | while (pid == -1); |
| 524 | |
| 525 | /* AIX has a couple of strange returns from wait(). */ |
| 526 | |
| 527 | /* stop after load" status. */ |
| 528 | if (status == 0x57c) |
| 529 | ourstatus->kind = TARGET_WAITKIND_LOADED; |
| 530 | /* signal 0. I have no idea why wait(2) returns with this status word. */ |
| 531 | else if (status == 0x7f) |
| 532 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| 533 | /* A normal waitstatus. Let the usual macros deal with it. */ |
| 534 | else |
| 535 | store_waitstatus (ourstatus, status); |
| 536 | |
| 537 | return pid_to_ptid (pid); |
| 538 | } |
| 539 | |
| 540 | /* Execute one dummy breakpoint instruction. This way we give the kernel |
| 541 | a chance to do some housekeeping and update inferior's internal data, |
| 542 | including u_area. */ |
| 543 | |
| 544 | static void |
| 545 | exec_one_dummy_insn (struct regcache *regcache) |
| 546 | { |
| 547 | #define DUMMY_INSN_ADDR AIX_TEXT_SEGMENT_BASE+0x200 |
| 548 | |
| 549 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 550 | int ret, status, pid; |
| 551 | CORE_ADDR prev_pc; |
| 552 | void *bp; |
| 553 | |
| 554 | /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We |
| 555 | assume that this address will never be executed again by the real |
| 556 | code. */ |
| 557 | |
| 558 | bp = deprecated_insert_raw_breakpoint (gdbarch, NULL, DUMMY_INSN_ADDR); |
| 559 | |
| 560 | /* You might think this could be done with a single ptrace call, and |
| 561 | you'd be correct for just about every platform I've ever worked |
| 562 | on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up -- |
| 563 | the inferior never hits the breakpoint (it's also worth noting |
| 564 | powerpc-ibm-aix4.1.3 works correctly). */ |
| 565 | prev_pc = regcache_read_pc (regcache); |
| 566 | regcache_write_pc (regcache, DUMMY_INSN_ADDR); |
| 567 | if (ARCH64 ()) |
| 568 | ret = rs6000_ptrace64 (PT_CONTINUE, ptid_get_pid (inferior_ptid), |
| 569 | 1, 0, NULL); |
| 570 | else |
| 571 | ret = rs6000_ptrace32 (PT_CONTINUE, ptid_get_pid (inferior_ptid), |
| 572 | (int *) 1, 0, NULL); |
| 573 | |
| 574 | if (ret != 0) |
| 575 | perror (_("pt_continue")); |
| 576 | |
| 577 | do |
| 578 | { |
| 579 | pid = waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
| 580 | } |
| 581 | while (pid != ptid_get_pid (inferior_ptid)); |
| 582 | |
| 583 | regcache_write_pc (regcache, prev_pc); |
| 584 | deprecated_remove_raw_breakpoint (gdbarch, bp); |
| 585 | } |
| 586 | \f |
| 587 | |
| 588 | /* Set the current architecture from the host running GDB. Called when |
| 589 | starting a child process. */ |
| 590 | |
| 591 | static void (*super_create_inferior) (struct target_ops *,char *exec_file, |
| 592 | char *allargs, char **env, int from_tty); |
| 593 | static void |
| 594 | rs6000_create_inferior (struct target_ops * ops, char *exec_file, |
| 595 | char *allargs, char **env, int from_tty) |
| 596 | { |
| 597 | enum bfd_architecture arch; |
| 598 | unsigned long mach; |
| 599 | bfd abfd; |
| 600 | struct gdbarch_info info; |
| 601 | |
| 602 | super_create_inferior (ops, exec_file, allargs, env, from_tty); |
| 603 | |
| 604 | if (__power_rs ()) |
| 605 | { |
| 606 | arch = bfd_arch_rs6000; |
| 607 | mach = bfd_mach_rs6k; |
| 608 | } |
| 609 | else |
| 610 | { |
| 611 | arch = bfd_arch_powerpc; |
| 612 | mach = bfd_mach_ppc; |
| 613 | } |
| 614 | |
| 615 | /* FIXME: schauer/2002-02-25: |
| 616 | We don't know if we are executing a 32 or 64 bit executable, |
| 617 | and have no way to pass the proper word size to rs6000_gdbarch_init. |
| 618 | So we have to avoid switching to a new architecture, if the architecture |
| 619 | matches already. |
| 620 | Blindly calling rs6000_gdbarch_init used to work in older versions of |
| 621 | GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to |
| 622 | determine the wordsize. */ |
| 623 | if (exec_bfd) |
| 624 | { |
| 625 | const struct bfd_arch_info *exec_bfd_arch_info; |
| 626 | |
| 627 | exec_bfd_arch_info = bfd_get_arch_info (exec_bfd); |
| 628 | if (arch == exec_bfd_arch_info->arch) |
| 629 | return; |
| 630 | } |
| 631 | |
| 632 | bfd_default_set_arch_mach (&abfd, arch, mach); |
| 633 | |
| 634 | gdbarch_info_init (&info); |
| 635 | info.bfd_arch_info = bfd_get_arch_info (&abfd); |
| 636 | info.abfd = exec_bfd; |
| 637 | |
| 638 | if (!gdbarch_update_p (info)) |
| 639 | internal_error (__FILE__, __LINE__, |
| 640 | _("rs6000_create_inferior: failed " |
| 641 | "to select architecture")); |
| 642 | } |
| 643 | \f |
| 644 | |
| 645 | /* Shared Object support. */ |
| 646 | |
| 647 | /* Return the LdInfo data for the given process. Raises an error |
| 648 | if the data could not be obtained. |
| 649 | |
| 650 | The returned value must be deallocated after use. */ |
| 651 | |
| 652 | static gdb_byte * |
| 653 | rs6000_ptrace_ldinfo (ptid_t ptid) |
| 654 | { |
| 655 | const int pid = ptid_get_pid (ptid); |
| 656 | int ldi_size = 1024; |
| 657 | gdb_byte *ldi = xmalloc (ldi_size); |
| 658 | int rc = -1; |
| 659 | |
| 660 | while (1) |
| 661 | { |
| 662 | if (ARCH64 ()) |
| 663 | rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi, ldi_size, |
| 664 | NULL); |
| 665 | else |
| 666 | rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi, ldi_size, NULL); |
| 667 | |
| 668 | if (rc != -1) |
| 669 | break; /* Success, we got the entire ld_info data. */ |
| 670 | |
| 671 | if (errno != ENOMEM) |
| 672 | perror_with_name (_("ptrace ldinfo")); |
| 673 | |
| 674 | /* ldi is not big enough. Double it and try again. */ |
| 675 | ldi_size *= 2; |
| 676 | ldi = xrealloc (ldi, ldi_size); |
| 677 | } |
| 678 | |
| 679 | return ldi; |
| 680 | } |
| 681 | |
| 682 | /* Implement the to_xfer_partial target_ops method for |
| 683 | TARGET_OBJECT_LIBRARIES_AIX objects. */ |
| 684 | |
| 685 | static LONGEST |
| 686 | rs6000_xfer_shared_libraries |
| 687 | (struct target_ops *ops, enum target_object object, |
| 688 | const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, |
| 689 | ULONGEST offset, ULONGEST len) |
| 690 | { |
| 691 | gdb_byte *ldi_buf; |
| 692 | ULONGEST result; |
| 693 | struct cleanup *cleanup; |
| 694 | |
| 695 | /* This function assumes that it is being run with a live process. |
| 696 | Core files are handled via gdbarch. */ |
| 697 | gdb_assert (target_has_execution); |
| 698 | |
| 699 | if (writebuf) |
| 700 | return -1; |
| 701 | |
| 702 | ldi_buf = rs6000_ptrace_ldinfo (inferior_ptid); |
| 703 | gdb_assert (ldi_buf != NULL); |
| 704 | cleanup = make_cleanup (xfree, ldi_buf); |
| 705 | result = rs6000_aix_ld_info_to_xml (target_gdbarch (), ldi_buf, |
| 706 | readbuf, offset, len, 1); |
| 707 | xfree (ldi_buf); |
| 708 | |
| 709 | do_cleanups (cleanup); |
| 710 | return result; |
| 711 | } |
| 712 | |
| 713 | void _initialize_rs6000_nat (void); |
| 714 | |
| 715 | void |
| 716 | _initialize_rs6000_nat (void) |
| 717 | { |
| 718 | struct target_ops *t; |
| 719 | |
| 720 | t = inf_ptrace_target (); |
| 721 | t->to_fetch_registers = rs6000_fetch_inferior_registers; |
| 722 | t->to_store_registers = rs6000_store_inferior_registers; |
| 723 | t->to_xfer_partial = rs6000_xfer_partial; |
| 724 | |
| 725 | super_create_inferior = t->to_create_inferior; |
| 726 | t->to_create_inferior = rs6000_create_inferior; |
| 727 | |
| 728 | t->to_wait = rs6000_wait; |
| 729 | |
| 730 | add_target (t); |
| 731 | } |