1 /* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
3 Copyright (C) 1986-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
26 #include "libbfd.h" /* For bfd_default_set_arch_mach (FIXME) */
28 #include "exceptions.h"
29 #include "gdb-stabs.h"
31 #include "arch-utils.h"
32 #include "inf-child.h"
33 #include "inf-ptrace.h"
35 #include "rs6000-tdep.h"
36 #include "rs6000-aix-tdep.h"
39 #include "xcoffread.h"
41 #include <sys/ptrace.h>
47 #include <sys/ioctl.h>
56 #define __LDINFO_PTRACE32__ /* for __ld_info32 */
57 #define __LDINFO_PTRACE64__ /* for __ld_info64 */
59 #include <sys/systemcfg.h>
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. */
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. */
68 #if defined (__ld_info32) || defined (__ld_info64)
72 /* Return whether the current architecture is 64-bit. */
77 # define ARCH64() (register_size (target_gdbarch (), 0) == 8)
80 static void exec_one_dummy_insn (struct regcache *);
82 static target_xfer_partial_ftype rs6000_xfer_shared_libraries;
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. */
90 regmap (struct gdbarch *gdbarch, int regno, int *isfloat)
92 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
95 if (tdep->ppc_gp0_regnum <= regno
96 && regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
98 else if (tdep->ppc_fp0_regnum >= 0
99 && tdep->ppc_fp0_regnum <= regno
100 && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
103 return regno - tdep->ppc_fp0_regnum + FPR0;
105 else if (regno == gdbarch_pc_regnum (gdbarch))
107 else if (regno == tdep->ppc_ps_regnum)
109 else if (regno == tdep->ppc_cr_regnum)
111 else if (regno == tdep->ppc_lr_regnum)
113 else if (regno == tdep->ppc_ctr_regnum)
115 else if (regno == tdep->ppc_xer_regnum)
117 else if (tdep->ppc_fpscr_regnum >= 0
118 && regno == tdep->ppc_fpscr_regnum)
120 else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum)
126 /* Call ptrace(REQ, ID, ADDR, DATA, BUF). */
129 rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf)
132 int ret = ptrace64 (req, id, (uintptr_t) addr, data, buf);
134 int ret = ptrace (req, id, (int *)addr, data, buf);
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);
143 /* Call ptracex(REQ, ID, ADDR, DATA, BUF). */
146 rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf)
149 # ifdef HAVE_PTRACE64
150 int ret = ptrace64 (req, id, addr, data, buf);
152 int ret = ptracex (req, id, addr, data, buf);
158 printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n",
159 req, id, hex_string (addr), data, (unsigned int)buf, ret);
164 /* Fetch register REGNO from the inferior. */
167 fetch_register (struct regcache *regcache, int regno)
169 struct gdbarch *gdbarch = get_regcache_arch (regcache);
170 int addr[MAX_REGISTER_SIZE];
173 /* Retrieved values may be -1, so infer errors from errno. */
176 nr = regmap (gdbarch, regno, &isfloat);
178 /* Floating-point registers. */
180 rs6000_ptrace32 (PT_READ_FPR, ptid_get_pid (inferior_ptid), addr, nr, 0);
182 /* Bogus register number. */
185 if (regno >= gdbarch_num_regs (gdbarch))
186 fprintf_unfiltered (gdb_stderr,
187 "gdb error: register no %d not implemented.\n",
192 /* Fixed-point registers. */
196 *addr = rs6000_ptrace32 (PT_READ_GPR, ptid_get_pid (inferior_ptid),
200 /* PT_READ_GPR requires the buffer parameter to point to long long,
201 even if the register is really only 32 bits. */
203 rs6000_ptrace64 (PT_READ_GPR, ptid_get_pid (inferior_ptid),
205 if (register_size (gdbarch, regno) == 8)
206 memcpy (addr, &buf, 8);
213 regcache_raw_supply (regcache, regno, (char *) addr);
217 /* FIXME: this happens 3 times at the start of each 64-bit program. */
218 perror (_("ptrace read"));
224 /* Store register REGNO back into the inferior. */
227 store_register (struct regcache *regcache, int regno)
229 struct gdbarch *gdbarch = get_regcache_arch (regcache);
230 int addr[MAX_REGISTER_SIZE];
233 /* Fetch the register's value from the register cache. */
234 regcache_raw_collect (regcache, regno, addr);
236 /* -1 can be a successful return value, so infer errors from errno. */
239 nr = regmap (gdbarch, regno, &isfloat);
241 /* Floating-point registers. */
243 rs6000_ptrace32 (PT_WRITE_FPR, ptid_get_pid (inferior_ptid), addr, nr, 0);
245 /* Bogus register number. */
248 if (regno >= gdbarch_num_regs (gdbarch))
249 fprintf_unfiltered (gdb_stderr,
250 "gdb error: register no %d not implemented.\n",
254 /* Fixed-point registers. */
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
263 exec_one_dummy_insn (regcache);
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. */
269 rs6000_ptrace32 (PT_WRITE_GPR, ptid_get_pid (inferior_ptid),
270 (int *) nr, *addr, 0);
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. */
276 if (register_size (gdbarch, regno) == 8)
277 memcpy (&buf, addr, 8);
280 rs6000_ptrace64 (PT_WRITE_GPR, ptid_get_pid (inferior_ptid),
287 perror (_("ptrace write"));
292 /* Read from the inferior all registers if REGNO == -1 and just register
296 rs6000_fetch_inferior_registers (struct target_ops *ops,
297 struct regcache *regcache, int regno)
299 struct gdbarch *gdbarch = get_regcache_arch (regcache);
301 fetch_register (regcache, regno);
305 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
307 /* Read 32 general purpose registers. */
308 for (regno = tdep->ppc_gp0_regnum;
309 regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
312 fetch_register (regcache, regno);
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);
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);
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). */
339 rs6000_store_inferior_registers (struct target_ops *ops,
340 struct regcache *regcache, int regno)
342 struct gdbarch *gdbarch = get_regcache_arch (regcache);
344 store_register (regcache, regno);
348 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
350 /* Write general purpose registers first. */
351 for (regno = tdep->ppc_gp0_regnum;
352 regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
355 store_register (regcache, regno);
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);
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);
377 /* Implement the to_xfer_partial target_ops method. */
379 static enum target_xfer_status
380 rs6000_xfer_partial (struct target_ops *ops, enum target_object object,
381 const char *annex, gdb_byte *readbuf,
382 const gdb_byte *writebuf,
383 ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
385 pid_t pid = ptid_get_pid (inferior_ptid);
386 int arch64 = ARCH64 ();
390 case TARGET_OBJECT_LIBRARIES_AIX:
391 return rs6000_xfer_shared_libraries (ops, object, annex,
393 offset, len, xfered_len);
394 case TARGET_OBJECT_MEMORY:
398 PTRACE_TYPE_RET word;
399 gdb_byte byte[sizeof (PTRACE_TYPE_RET)];
401 ULONGEST rounded_offset;
404 /* Round the start offset down to the next long word
406 rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
408 /* Since ptrace will transfer a single word starting at that
409 rounded_offset the partial_len needs to be adjusted down to
410 that (remember this function only does a single transfer).
411 Should the required length be even less, adjust it down
413 partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
414 if (partial_len > len)
419 /* If OFFSET:PARTIAL_LEN is smaller than
420 ROUNDED_OFFSET:WORDSIZE then a read/modify write will
421 be needed. Read in the entire word. */
422 if (rounded_offset < offset
423 || (offset + partial_len
424 < rounded_offset + sizeof (PTRACE_TYPE_RET)))
426 /* Need part of initial word -- fetch it. */
428 buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
429 rounded_offset, 0, NULL);
431 buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
437 /* Copy data to be written over corresponding part of
439 memcpy (buffer.byte + (offset - rounded_offset),
440 writebuf, partial_len);
444 rs6000_ptrace64 (PT_WRITE_D, pid,
445 rounded_offset, buffer.word, NULL);
447 rs6000_ptrace32 (PT_WRITE_D, pid,
448 (int *) (uintptr_t) rounded_offset,
451 return TARGET_XFER_EOF;
458 buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
459 rounded_offset, 0, NULL);
461 buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
462 (int *)(uintptr_t)rounded_offset,
465 return TARGET_XFER_EOF;
467 /* Copy appropriate bytes out of the buffer. */
468 memcpy (readbuf, buffer.byte + (offset - rounded_offset),
472 *xfered_len = (ULONGEST) partial_len;
473 return TARGET_XFER_OK;
477 return TARGET_XFER_E_IO;
481 /* Wait for the child specified by PTID to do something. Return the
482 process ID of the child, or MINUS_ONE_PTID in case of error; store
483 the status in *OURSTATUS. */
486 rs6000_wait (struct target_ops *ops,
487 ptid_t ptid, struct target_waitstatus *ourstatus, int options)
490 int status, save_errno;
498 pid = waitpid (ptid_get_pid (ptid), &status, 0);
501 while (pid == -1 && errno == EINTR);
503 clear_sigint_trap ();
507 fprintf_unfiltered (gdb_stderr,
508 _("Child process unexpectedly missing: %s.\n"),
509 safe_strerror (save_errno));
511 /* Claim it exited with unknown signal. */
512 ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
513 ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
514 return inferior_ptid;
517 /* Ignore terminated detached child processes. */
518 if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid))
523 /* AIX has a couple of strange returns from wait(). */
525 /* stop after load" status. */
527 ourstatus->kind = TARGET_WAITKIND_LOADED;
528 /* signal 0. I have no idea why wait(2) returns with this status word. */
529 else if (status == 0x7f)
530 ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
531 /* A normal waitstatus. Let the usual macros deal with it. */
533 store_waitstatus (ourstatus, status);
535 return pid_to_ptid (pid);
538 /* Execute one dummy breakpoint instruction. This way we give the kernel
539 a chance to do some housekeeping and update inferior's internal data,
543 exec_one_dummy_insn (struct regcache *regcache)
545 #define DUMMY_INSN_ADDR AIX_TEXT_SEGMENT_BASE+0x200
547 struct gdbarch *gdbarch = get_regcache_arch (regcache);
548 int ret, status, pid;
552 /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We
553 assume that this address will never be executed again by the real
556 bp = deprecated_insert_raw_breakpoint (gdbarch, NULL, DUMMY_INSN_ADDR);
558 /* You might think this could be done with a single ptrace call, and
559 you'd be correct for just about every platform I've ever worked
560 on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up --
561 the inferior never hits the breakpoint (it's also worth noting
562 powerpc-ibm-aix4.1.3 works correctly). */
563 prev_pc = regcache_read_pc (regcache);
564 regcache_write_pc (regcache, DUMMY_INSN_ADDR);
566 ret = rs6000_ptrace64 (PT_CONTINUE, ptid_get_pid (inferior_ptid),
569 ret = rs6000_ptrace32 (PT_CONTINUE, ptid_get_pid (inferior_ptid),
573 perror (_("pt_continue"));
577 pid = waitpid (ptid_get_pid (inferior_ptid), &status, 0);
579 while (pid != ptid_get_pid (inferior_ptid));
581 regcache_write_pc (regcache, prev_pc);
582 deprecated_remove_raw_breakpoint (gdbarch, bp);
586 /* Set the current architecture from the host running GDB. Called when
587 starting a child process. */
589 static void (*super_create_inferior) (struct target_ops *,char *exec_file,
590 char *allargs, char **env, int from_tty);
592 rs6000_create_inferior (struct target_ops * ops, char *exec_file,
593 char *allargs, char **env, int from_tty)
595 enum bfd_architecture arch;
598 struct gdbarch_info info;
600 super_create_inferior (ops, exec_file, allargs, env, from_tty);
604 arch = bfd_arch_rs6000;
605 mach = bfd_mach_rs6k;
609 arch = bfd_arch_powerpc;
613 /* FIXME: schauer/2002-02-25:
614 We don't know if we are executing a 32 or 64 bit executable,
615 and have no way to pass the proper word size to rs6000_gdbarch_init.
616 So we have to avoid switching to a new architecture, if the architecture
618 Blindly calling rs6000_gdbarch_init used to work in older versions of
619 GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to
620 determine the wordsize. */
623 const struct bfd_arch_info *exec_bfd_arch_info;
625 exec_bfd_arch_info = bfd_get_arch_info (exec_bfd);
626 if (arch == exec_bfd_arch_info->arch)
630 bfd_default_set_arch_mach (&abfd, arch, mach);
632 gdbarch_info_init (&info);
633 info.bfd_arch_info = bfd_get_arch_info (&abfd);
634 info.abfd = exec_bfd;
636 if (!gdbarch_update_p (info))
637 internal_error (__FILE__, __LINE__,
638 _("rs6000_create_inferior: failed "
639 "to select architecture"));
643 /* Shared Object support. */
645 /* Return the LdInfo data for the given process. Raises an error
646 if the data could not be obtained.
648 The returned value must be deallocated after use. */
651 rs6000_ptrace_ldinfo (ptid_t ptid)
653 const int pid = ptid_get_pid (ptid);
655 gdb_byte *ldi = xmalloc (ldi_size);
661 rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi, ldi_size,
664 rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi, ldi_size, NULL);
667 break; /* Success, we got the entire ld_info data. */
670 perror_with_name (_("ptrace ldinfo"));
672 /* ldi is not big enough. Double it and try again. */
674 ldi = xrealloc (ldi, ldi_size);
680 /* Implement the to_xfer_partial target_ops method for
681 TARGET_OBJECT_LIBRARIES_AIX objects. */
683 static enum target_xfer_status
684 rs6000_xfer_shared_libraries
685 (struct target_ops *ops, enum target_object object,
686 const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf,
687 ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
691 struct cleanup *cleanup;
693 /* This function assumes that it is being run with a live process.
694 Core files are handled via gdbarch. */
695 gdb_assert (target_has_execution);
698 return TARGET_XFER_E_IO;
700 ldi_buf = rs6000_ptrace_ldinfo (inferior_ptid);
701 gdb_assert (ldi_buf != NULL);
702 cleanup = make_cleanup (xfree, ldi_buf);
703 result = rs6000_aix_ld_info_to_xml (target_gdbarch (), ldi_buf,
704 readbuf, offset, len, 1);
707 do_cleanups (cleanup);
710 return TARGET_XFER_EOF;
713 *xfered_len = result;
714 return TARGET_XFER_OK;
718 void _initialize_rs6000_nat (void);
721 _initialize_rs6000_nat (void)
723 struct target_ops *t;
725 t = inf_ptrace_target ();
726 t->to_fetch_registers = rs6000_fetch_inferior_registers;
727 t->to_store_registers = rs6000_store_inferior_registers;
728 t->to_xfer_partial = rs6000_xfer_partial;
730 super_create_inferior = t->to_create_inferior;
731 t->to_create_inferior = rs6000_create_inferior;
733 t->to_wait = rs6000_wait;