1 /* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
3 Copyright (C) 1986-2013 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. */
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 LONGEST rs6000_xfer_shared_libraries
83 (struct target_ops *ops, enum target_object object,
84 const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf,
85 ULONGEST offset, LONGEST len);
87 /* Given REGNO, a gdb register number, return the corresponding
88 number suitable for use as a ptrace() parameter. Return -1 if
89 there's no suitable mapping. Also, set the int pointed to by
90 ISFLOAT to indicate whether REGNO is a floating point register. */
93 regmap (struct gdbarch *gdbarch, int regno, int *isfloat)
95 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
98 if (tdep->ppc_gp0_regnum <= regno
99 && regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
101 else if (tdep->ppc_fp0_regnum >= 0
102 && tdep->ppc_fp0_regnum <= regno
103 && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
106 return regno - tdep->ppc_fp0_regnum + FPR0;
108 else if (regno == gdbarch_pc_regnum (gdbarch))
110 else if (regno == tdep->ppc_ps_regnum)
112 else if (regno == tdep->ppc_cr_regnum)
114 else if (regno == tdep->ppc_lr_regnum)
116 else if (regno == tdep->ppc_ctr_regnum)
118 else if (regno == tdep->ppc_xer_regnum)
120 else if (tdep->ppc_fpscr_regnum >= 0
121 && regno == tdep->ppc_fpscr_regnum)
123 else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum)
129 /* Call ptrace(REQ, ID, ADDR, DATA, BUF). */
132 rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf)
134 int ret = ptrace (req, id, (int *)addr, data, buf);
136 printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n",
137 req, id, (unsigned int)addr, data, (unsigned int)buf, ret);
142 /* Call ptracex(REQ, ID, ADDR, DATA, BUF). */
145 rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf)
148 int ret = ptracex (req, id, addr, data, buf);
153 printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n",
154 req, id, hex_string (addr), data, (unsigned int)buf, ret);
159 /* Fetch register REGNO from the inferior. */
162 fetch_register (struct regcache *regcache, int regno)
164 struct gdbarch *gdbarch = get_regcache_arch (regcache);
165 int addr[MAX_REGISTER_SIZE];
168 /* Retrieved values may be -1, so infer errors from errno. */
171 nr = regmap (gdbarch, regno, &isfloat);
173 /* Floating-point registers. */
175 rs6000_ptrace32 (PT_READ_FPR, PIDGET (inferior_ptid), addr, nr, 0);
177 /* Bogus register number. */
180 if (regno >= gdbarch_num_regs (gdbarch))
181 fprintf_unfiltered (gdb_stderr,
182 "gdb error: register no %d not implemented.\n",
187 /* Fixed-point registers. */
191 *addr = rs6000_ptrace32 (PT_READ_GPR, PIDGET (inferior_ptid),
195 /* PT_READ_GPR requires the buffer parameter to point to long long,
196 even if the register is really only 32 bits. */
198 rs6000_ptrace64 (PT_READ_GPR, PIDGET (inferior_ptid), nr, 0, &buf);
199 if (register_size (gdbarch, regno) == 8)
200 memcpy (addr, &buf, 8);
207 regcache_raw_supply (regcache, regno, (char *) addr);
211 /* FIXME: this happens 3 times at the start of each 64-bit program. */
212 perror (_("ptrace read"));
218 /* Store register REGNO back into the inferior. */
221 store_register (struct regcache *regcache, int regno)
223 struct gdbarch *gdbarch = get_regcache_arch (regcache);
224 int addr[MAX_REGISTER_SIZE];
227 /* Fetch the register's value from the register cache. */
228 regcache_raw_collect (regcache, regno, addr);
230 /* -1 can be a successful return value, so infer errors from errno. */
233 nr = regmap (gdbarch, regno, &isfloat);
235 /* Floating-point registers. */
237 rs6000_ptrace32 (PT_WRITE_FPR, PIDGET (inferior_ptid), addr, nr, 0);
239 /* Bogus register number. */
242 if (regno >= gdbarch_num_regs (gdbarch))
243 fprintf_unfiltered (gdb_stderr,
244 "gdb error: register no %d not implemented.\n",
248 /* Fixed-point registers. */
251 if (regno == gdbarch_sp_regnum (gdbarch))
252 /* Execute one dummy instruction (which is a breakpoint) in inferior
253 process to give kernel a chance to do internal housekeeping.
254 Otherwise the following ptrace(2) calls will mess up user stack
255 since kernel will get confused about the bottom of the stack
257 exec_one_dummy_insn (regcache);
259 /* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors,
260 the register's value is passed by value, but for 64-bit inferiors,
261 the address of a buffer containing the value is passed. */
263 rs6000_ptrace32 (PT_WRITE_GPR, PIDGET (inferior_ptid),
264 (int *) nr, *addr, 0);
267 /* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte
268 area, even if the register is really only 32 bits. */
270 if (register_size (gdbarch, regno) == 8)
271 memcpy (&buf, addr, 8);
274 rs6000_ptrace64 (PT_WRITE_GPR, PIDGET (inferior_ptid), nr, 0, &buf);
280 perror (_("ptrace write"));
285 /* Read from the inferior all registers if REGNO == -1 and just register
289 rs6000_fetch_inferior_registers (struct target_ops *ops,
290 struct regcache *regcache, int regno)
292 struct gdbarch *gdbarch = get_regcache_arch (regcache);
294 fetch_register (regcache, regno);
298 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
300 /* Read 32 general purpose registers. */
301 for (regno = tdep->ppc_gp0_regnum;
302 regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
305 fetch_register (regcache, regno);
308 /* Read general purpose floating point registers. */
309 if (tdep->ppc_fp0_regnum >= 0)
310 for (regno = 0; regno < ppc_num_fprs; regno++)
311 fetch_register (regcache, tdep->ppc_fp0_regnum + regno);
313 /* Read special registers. */
314 fetch_register (regcache, gdbarch_pc_regnum (gdbarch));
315 fetch_register (regcache, tdep->ppc_ps_regnum);
316 fetch_register (regcache, tdep->ppc_cr_regnum);
317 fetch_register (regcache, tdep->ppc_lr_regnum);
318 fetch_register (regcache, tdep->ppc_ctr_regnum);
319 fetch_register (regcache, tdep->ppc_xer_regnum);
320 if (tdep->ppc_fpscr_regnum >= 0)
321 fetch_register (regcache, tdep->ppc_fpscr_regnum);
322 if (tdep->ppc_mq_regnum >= 0)
323 fetch_register (regcache, tdep->ppc_mq_regnum);
327 /* Store our register values back into the inferior.
328 If REGNO is -1, do this for all registers.
329 Otherwise, REGNO specifies which register (so we can save time). */
332 rs6000_store_inferior_registers (struct target_ops *ops,
333 struct regcache *regcache, int regno)
335 struct gdbarch *gdbarch = get_regcache_arch (regcache);
337 store_register (regcache, regno);
341 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
343 /* Write general purpose registers first. */
344 for (regno = tdep->ppc_gp0_regnum;
345 regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
348 store_register (regcache, regno);
351 /* Write floating point registers. */
352 if (tdep->ppc_fp0_regnum >= 0)
353 for (regno = 0; regno < ppc_num_fprs; regno++)
354 store_register (regcache, tdep->ppc_fp0_regnum + regno);
356 /* Write special registers. */
357 store_register (regcache, gdbarch_pc_regnum (gdbarch));
358 store_register (regcache, tdep->ppc_ps_regnum);
359 store_register (regcache, tdep->ppc_cr_regnum);
360 store_register (regcache, tdep->ppc_lr_regnum);
361 store_register (regcache, tdep->ppc_ctr_regnum);
362 store_register (regcache, tdep->ppc_xer_regnum);
363 if (tdep->ppc_fpscr_regnum >= 0)
364 store_register (regcache, tdep->ppc_fpscr_regnum);
365 if (tdep->ppc_mq_regnum >= 0)
366 store_register (regcache, tdep->ppc_mq_regnum);
371 /* Attempt a transfer all LEN bytes starting at OFFSET between the
372 inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer.
373 Return the number of bytes actually transferred. */
376 rs6000_xfer_partial (struct target_ops *ops, enum target_object object,
377 const char *annex, gdb_byte *readbuf,
378 const gdb_byte *writebuf,
379 ULONGEST offset, LONGEST len)
381 pid_t pid = ptid_get_pid (inferior_ptid);
382 int arch64 = ARCH64 ();
386 case TARGET_OBJECT_LIBRARIES_AIX:
387 return rs6000_xfer_shared_libraries (ops, object, annex,
390 case TARGET_OBJECT_MEMORY:
394 PTRACE_TYPE_RET word;
395 gdb_byte byte[sizeof (PTRACE_TYPE_RET)];
397 ULONGEST rounded_offset;
400 /* Round the start offset down to the next long word
402 rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
404 /* Since ptrace will transfer a single word starting at that
405 rounded_offset the partial_len needs to be adjusted down to
406 that (remember this function only does a single transfer).
407 Should the required length be even less, adjust it down
409 partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
410 if (partial_len > len)
415 /* If OFFSET:PARTIAL_LEN is smaller than
416 ROUNDED_OFFSET:WORDSIZE then a read/modify write will
417 be needed. Read in the entire word. */
418 if (rounded_offset < offset
419 || (offset + partial_len
420 < rounded_offset + sizeof (PTRACE_TYPE_RET)))
422 /* Need part of initial word -- fetch it. */
424 buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
425 rounded_offset, 0, NULL);
427 buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
433 /* Copy data to be written over corresponding part of
435 memcpy (buffer.byte + (offset - rounded_offset),
436 writebuf, partial_len);
440 rs6000_ptrace64 (PT_WRITE_D, pid,
441 rounded_offset, buffer.word, NULL);
443 rs6000_ptrace32 (PT_WRITE_D, pid,
444 (int *) (uintptr_t) rounded_offset,
454 buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
455 rounded_offset, 0, NULL);
457 buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
458 (int *)(uintptr_t)rounded_offset,
463 /* Copy appropriate bytes out of the buffer. */
464 memcpy (readbuf, buffer.byte + (offset - rounded_offset),
476 /* Wait for the child specified by PTID to do something. Return the
477 process ID of the child, or MINUS_ONE_PTID in case of error; store
478 the status in *OURSTATUS. */
481 rs6000_wait (struct target_ops *ops,
482 ptid_t ptid, struct target_waitstatus *ourstatus, int options)
485 int status, save_errno;
493 pid = waitpid (ptid_get_pid (ptid), &status, 0);
496 while (pid == -1 && errno == EINTR);
498 clear_sigint_trap ();
502 fprintf_unfiltered (gdb_stderr,
503 _("Child process unexpectedly missing: %s.\n"),
504 safe_strerror (save_errno));
506 /* Claim it exited with unknown signal. */
507 ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
508 ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
509 return inferior_ptid;
512 /* Ignore terminated detached child processes. */
513 if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid))
518 /* AIX has a couple of strange returns from wait(). */
520 /* stop after load" status. */
522 ourstatus->kind = TARGET_WAITKIND_LOADED;
523 /* signal 0. I have no idea why wait(2) returns with this status word. */
524 else if (status == 0x7f)
525 ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
526 /* A normal waitstatus. Let the usual macros deal with it. */
528 store_waitstatus (ourstatus, status);
530 return pid_to_ptid (pid);
533 /* Execute one dummy breakpoint instruction. This way we give the kernel
534 a chance to do some housekeeping and update inferior's internal data,
538 exec_one_dummy_insn (struct regcache *regcache)
540 #define DUMMY_INSN_ADDR AIX_TEXT_SEGMENT_BASE+0x200
542 struct gdbarch *gdbarch = get_regcache_arch (regcache);
543 int ret, status, pid;
547 /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We
548 assume that this address will never be executed again by the real
551 bp = deprecated_insert_raw_breakpoint (gdbarch, NULL, DUMMY_INSN_ADDR);
553 /* You might think this could be done with a single ptrace call, and
554 you'd be correct for just about every platform I've ever worked
555 on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up --
556 the inferior never hits the breakpoint (it's also worth noting
557 powerpc-ibm-aix4.1.3 works correctly). */
558 prev_pc = regcache_read_pc (regcache);
559 regcache_write_pc (regcache, DUMMY_INSN_ADDR);
561 ret = rs6000_ptrace64 (PT_CONTINUE, PIDGET (inferior_ptid), 1, 0, NULL);
563 ret = rs6000_ptrace32 (PT_CONTINUE, PIDGET (inferior_ptid),
567 perror (_("pt_continue"));
571 pid = waitpid (PIDGET (inferior_ptid), &status, 0);
573 while (pid != PIDGET (inferior_ptid));
575 regcache_write_pc (regcache, prev_pc);
576 deprecated_remove_raw_breakpoint (gdbarch, bp);
580 /* Set the current architecture from the host running GDB. Called when
581 starting a child process. */
583 static void (*super_create_inferior) (struct target_ops *,char *exec_file,
584 char *allargs, char **env, int from_tty);
586 rs6000_create_inferior (struct target_ops * ops, char *exec_file,
587 char *allargs, char **env, int from_tty)
589 enum bfd_architecture arch;
592 struct gdbarch_info info;
594 super_create_inferior (ops, exec_file, allargs, env, from_tty);
598 arch = bfd_arch_rs6000;
599 mach = bfd_mach_rs6k;
603 arch = bfd_arch_powerpc;
607 /* FIXME: schauer/2002-02-25:
608 We don't know if we are executing a 32 or 64 bit executable,
609 and have no way to pass the proper word size to rs6000_gdbarch_init.
610 So we have to avoid switching to a new architecture, if the architecture
612 Blindly calling rs6000_gdbarch_init used to work in older versions of
613 GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to
614 determine the wordsize. */
617 const struct bfd_arch_info *exec_bfd_arch_info;
619 exec_bfd_arch_info = bfd_get_arch_info (exec_bfd);
620 if (arch == exec_bfd_arch_info->arch)
624 bfd_default_set_arch_mach (&abfd, arch, mach);
626 gdbarch_info_init (&info);
627 info.bfd_arch_info = bfd_get_arch_info (&abfd);
628 info.abfd = exec_bfd;
630 if (!gdbarch_update_p (info))
631 internal_error (__FILE__, __LINE__,
632 _("rs6000_create_inferior: failed "
633 "to select architecture"));
637 /* Shared Object support. */
639 /* Return the LdInfo data for the given process. Raises an error
640 if the data could not be obtained.
642 The returned value must be deallocated after use. */
645 rs6000_ptrace_ldinfo (ptid_t ptid)
647 const int pid = ptid_get_pid (ptid);
649 gdb_byte *ldi = xmalloc (ldi_size);
655 rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi, ldi_size,
658 rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi, ldi_size, NULL);
661 break; /* Success, we got the entire ld_info data. */
664 perror_with_name (_("ptrace ldinfo"));
666 /* ldi is not big enough. Double it and try again. */
668 ldi = xrealloc (ldi, ldi_size);
674 /* Implement the to_xfer_partial target_ops method for
675 TARGET_OBJECT_LIBRARIES_AIX objects. */
678 rs6000_xfer_shared_libraries
679 (struct target_ops *ops, enum target_object object,
680 const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf,
681 ULONGEST offset, LONGEST len)
685 struct cleanup *cleanup;
687 /* This function assumes that it is being run with a live process.
688 Core files are handled via gdbarch. */
689 gdb_assert (target_has_execution);
694 ldi_buf = rs6000_ptrace_ldinfo (inferior_ptid);
695 gdb_assert (ldi_buf != NULL);
696 cleanup = make_cleanup (xfree, ldi_buf);
697 result = rs6000_aix_ld_info_to_xml (target_gdbarch (), ldi_buf,
698 readbuf, offset, len, 1);
701 do_cleanups (cleanup);
705 void _initialize_rs6000_nat (void);
708 _initialize_rs6000_nat (void)
710 struct target_ops *t;
712 t = inf_ptrace_target ();
713 t->to_fetch_registers = rs6000_fetch_inferior_registers;
714 t->to_store_registers = rs6000_store_inferior_registers;
715 t->to_xfer_partial = rs6000_xfer_partial;
717 super_create_inferior = t->to_create_inferior;
718 t->to_create_inferior = rs6000_create_inferior;
720 t->to_wait = rs6000_wait;