1 /* SPU native-dependent code for GDB, the GNU debugger.
2 Copyright (C) 2006, 2007 Free Software Foundation, Inc.
4 Contributed by Ulrich Weigand <uweigand@de.ibm.com>.
6 This file is part of GDB.
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 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
25 #include "gdb_string.h"
28 #include "inf-ptrace.h"
32 #include "gdb_stdint.h"
34 #include <sys/ptrace.h>
35 #include <asm/ptrace.h>
36 #include <sys/types.h>
37 #include <sys/param.h>
41 /* PPU side system calls. */
42 #define INSTR_SC 0x44000002
43 #define NR_spu_run 0x0116
46 /* Fetch PPU register REGNO. */
48 fetch_ppc_register (int regno
)
52 int tid
= TIDGET (inferior_ptid
);
54 tid
= PIDGET (inferior_ptid
);
57 /* If running as a 32-bit process on a 64-bit system, we attempt
58 to get the full 64-bit register content of the target process.
59 If the PPC special ptrace call fails, we're on a 32-bit system;
60 just fall through to the regular ptrace call in that case. */
65 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
66 (PTRACE_TYPE_ARG3
) (regno
* 8), buf
);
68 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
69 (PTRACE_TYPE_ARG3
) (regno
* 8 + 4), buf
+ 4);
71 return (ULONGEST
) *(uint64_t *)buf
;
76 res
= ptrace (PT_READ_U
, tid
,
77 (PTRACE_TYPE_ARG3
) (regno
* sizeof (PTRACE_TYPE_RET
)), 0);
81 xsnprintf (mess
, sizeof mess
, "reading PPC register #%d", regno
);
82 perror_with_name (_(mess
));
85 return (ULONGEST
) (unsigned long) res
;
88 /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
90 fetch_ppc_memory_1 (int tid
, ULONGEST memaddr
, PTRACE_TYPE_RET
*word
)
97 uint64_t addr_8
= (uint64_t) memaddr
;
98 ptrace (PPC_PTRACE_PEEKTEXT_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
102 *word
= ptrace (PT_READ_I
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, 0);
107 /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
109 store_ppc_memory_1 (int tid
, ULONGEST memaddr
, PTRACE_TYPE_RET word
)
113 #ifndef __powerpc64__
116 uint64_t addr_8
= (uint64_t) memaddr
;
117 ptrace (PPC_PTRACE_POKEDATA_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
121 ptrace (PT_WRITE_D
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, word
);
126 /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
128 fetch_ppc_memory (ULONGEST memaddr
, gdb_byte
*myaddr
, int len
)
132 ULONGEST addr
= memaddr
& -(ULONGEST
) sizeof (PTRACE_TYPE_RET
);
133 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
134 / sizeof (PTRACE_TYPE_RET
));
135 PTRACE_TYPE_RET
*buffer
;
137 int tid
= TIDGET (inferior_ptid
);
139 tid
= PIDGET (inferior_ptid
);
141 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
142 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
144 ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[i
]);
150 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
156 /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
158 store_ppc_memory (ULONGEST memaddr
, const gdb_byte
*myaddr
, int len
)
162 ULONGEST addr
= memaddr
& -(ULONGEST
) sizeof (PTRACE_TYPE_RET
);
163 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
164 / sizeof (PTRACE_TYPE_RET
));
165 PTRACE_TYPE_RET
*buffer
;
167 int tid
= TIDGET (inferior_ptid
);
169 tid
= PIDGET (inferior_ptid
);
171 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
173 if (addr
!= memaddr
|| len
< (int) sizeof (PTRACE_TYPE_RET
))
175 ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[0]);
182 ret
= fetch_ppc_memory_1 (tid
, addr
+ (count
- 1)
183 * sizeof (PTRACE_TYPE_RET
),
189 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
192 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
194 ret
= store_ppc_memory_1 (tid
, addr
, buffer
[i
]);
203 /* If the PPU thread is currently stopped on a spu_run system call,
204 return to FD and ADDR the file handle and NPC parameter address
205 used with the system call. Return non-zero if successful. */
207 parse_spufs_run (int *fd
, ULONGEST
*addr
)
210 ULONGEST pc
= fetch_ppc_register (32); /* nip */
212 /* Fetch instruction preceding current NIP. */
213 if (fetch_ppc_memory (pc
-4, buf
, 4) != 0)
215 /* It should be a "sc" instruction. */
216 if (extract_unsigned_integer (buf
, 4) != INSTR_SC
)
218 /* System call number should be NR_spu_run. */
219 if (fetch_ppc_register (0) != NR_spu_run
)
222 /* Register 3 contains fd, register 4 the NPC param pointer. */
223 *fd
= fetch_ppc_register (34); /* orig_gpr3 */
224 *addr
= fetch_ppc_register (4);
229 /* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,
230 using the /proc file system. */
232 spu_proc_xfer_spu (const char *annex
, gdb_byte
*readbuf
,
233 const gdb_byte
*writebuf
,
234 ULONGEST offset
, LONGEST len
)
239 int pid
= PIDGET (inferior_ptid
);
244 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
245 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
250 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
257 ret
= write (fd
, writebuf
, (size_t) len
);
259 ret
= read (fd
, readbuf
, (size_t) len
);
266 /* Inferior memory should contain an SPE executable image at location ADDR.
267 Allocate a BFD representing that executable. Return NULL on error. */
270 spu_bfd_iovec_open (struct bfd
*nbfd
, void *open_closure
)
276 spu_bfd_iovec_close (struct bfd
*nbfd
, void *stream
)
283 spu_bfd_iovec_pread (struct bfd
*abfd
, void *stream
, void *buf
,
284 file_ptr nbytes
, file_ptr offset
)
286 ULONGEST addr
= *(ULONGEST
*)stream
;
288 if (fetch_ppc_memory (addr
+ offset
, buf
, nbytes
) != 0)
290 bfd_set_error (bfd_error_invalid_operation
);
298 spu_bfd_iovec_stat (struct bfd
*abfd
, void *stream
, struct stat
*sb
)
300 /* We don't have an easy way of finding the size of embedded spu
301 images. We could parse the in-memory ELF header and section
302 table to find the extent of the last section but that seems
303 pointless when the size is needed only for checks of other
304 parsed values in dbxread.c. */
305 sb
->st_size
= INT_MAX
;
310 spu_bfd_open (ULONGEST addr
)
314 ULONGEST
*open_closure
= xmalloc (sizeof (ULONGEST
));
315 *open_closure
= addr
;
317 nbfd
= bfd_openr_iovec (xstrdup ("<in-memory>"), "elf32-spu",
318 spu_bfd_iovec_open
, open_closure
,
319 spu_bfd_iovec_pread
, spu_bfd_iovec_close
,
324 if (!bfd_check_format (nbfd
, bfd_object
))
333 /* INFERIOR_FD is a file handle passed by the inferior to the
334 spu_run system call. Assuming the SPE context was allocated
335 by the libspe library, try to retrieve the main SPE executable
336 file from its copy within the target process. */
338 spu_symbol_file_add_from_memory (int inferior_fd
)
347 /* Read object ID. */
348 xsnprintf (annex
, sizeof annex
, "%d/object-id", inferior_fd
);
349 len
= spu_proc_xfer_spu (annex
, id
, NULL
, 0, sizeof id
);
350 if (len
<= 0 || len
>= sizeof id
)
353 addr
= strtoulst (id
, NULL
, 16);
357 /* Open BFD representing SPE executable and read its symbols. */
358 nbfd
= spu_bfd_open (addr
);
360 symbol_file_add_from_bfd (nbfd
, 0, NULL
, 1, 0);
364 /* Override the post_startup_inferior routine to continue running
365 the inferior until the first spu_run system call. */
367 spu_child_post_startup_inferior (ptid_t ptid
)
372 int tid
= TIDGET (ptid
);
376 while (!parse_spufs_run (&fd
, &addr
))
378 ptrace (PT_SYSCALL
, tid
, (PTRACE_TYPE_ARG3
) 0, 0);
379 waitpid (tid
, NULL
, __WALL
| __WNOTHREAD
);
383 /* Override the post_attach routine to try load the SPE executable
384 file image from its copy inside the target process. */
386 spu_child_post_attach (int pid
)
391 /* Like child_post_startup_inferior, if we happened to attach to
392 the inferior while it wasn't currently in spu_run, continue
393 running it until we get back there. */
394 while (!parse_spufs_run (&fd
, &addr
))
396 ptrace (PT_SYSCALL
, pid
, (PTRACE_TYPE_ARG3
) 0, 0);
397 waitpid (pid
, NULL
, __WALL
| __WNOTHREAD
);
400 /* If the user has not provided an executable file, try to extract
401 the image from inside the target process. */
402 if (!get_exec_file (0))
403 spu_symbol_file_add_from_memory (fd
);
406 /* Wait for child PTID to do something. Return id of the child,
407 minus_one_ptid in case of error; store status into *OURSTATUS. */
409 spu_child_wait (ptid_t ptid
, struct target_waitstatus
*ourstatus
)
417 set_sigint_trap (); /* Causes SIGINT to be passed on to the
421 pid
= waitpid (PIDGET (ptid
), &status
, 0);
422 if (pid
== -1 && errno
== ECHILD
)
423 /* Try again with __WCLONE to check cloned processes. */
424 pid
= waitpid (PIDGET (ptid
), &status
, __WCLONE
);
428 /* Make sure we don't report an event for the exit of the
429 original program, if we've detached from it. */
430 if (pid
!= -1 && !WIFSTOPPED (status
) && pid
!= PIDGET (inferior_ptid
))
437 clear_sigint_trap ();
439 while (pid
== -1 && save_errno
== EINTR
);
443 warning (_("Child process unexpectedly missing: %s"),
444 safe_strerror (save_errno
));
446 /* Claim it exited with unknown signal. */
447 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
448 ourstatus
->value
.sig
= TARGET_SIGNAL_UNKNOWN
;
449 return minus_one_ptid
;
452 store_waitstatus (ourstatus
, status
);
453 return pid_to_ptid (pid
);
456 /* Override the fetch_inferior_register routine. */
458 spu_fetch_inferior_registers (struct regcache
*regcache
, int regno
)
463 /* We must be stopped on a spu_run system call. */
464 if (!parse_spufs_run (&fd
, &addr
))
467 /* The ID register holds the spufs file handle. */
468 if (regno
== -1 || regno
== SPU_ID_REGNUM
)
471 store_unsigned_integer (buf
, 4, fd
);
472 regcache_raw_supply (regcache
, SPU_ID_REGNUM
, buf
);
475 /* The NPC register is found at ADDR. */
476 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
479 if (fetch_ppc_memory (addr
, buf
, 4) == 0)
480 regcache_raw_supply (regcache
, SPU_PC_REGNUM
, buf
);
483 /* The GPRs are found in the "regs" spufs file. */
484 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_GPRS
))
486 gdb_byte buf
[16 * SPU_NUM_GPRS
];
490 xsnprintf (annex
, sizeof annex
, "%d/regs", fd
);
491 if (spu_proc_xfer_spu (annex
, buf
, NULL
, 0, sizeof buf
) == sizeof buf
)
492 for (i
= 0; i
< SPU_NUM_GPRS
; i
++)
493 regcache_raw_supply (regcache
, i
, buf
+ i
*16);
497 /* Override the store_inferior_register routine. */
499 spu_store_inferior_registers (struct regcache
*regcache
, int regno
)
504 /* We must be stopped on a spu_run system call. */
505 if (!parse_spufs_run (&fd
, &addr
))
508 /* The NPC register is found at ADDR. */
509 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
512 regcache_raw_collect (regcache
, SPU_PC_REGNUM
, buf
);
513 store_ppc_memory (addr
, buf
, 4);
516 /* The GPRs are found in the "regs" spufs file. */
517 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_GPRS
))
519 gdb_byte buf
[16 * SPU_NUM_GPRS
];
523 for (i
= 0; i
< SPU_NUM_GPRS
; i
++)
524 regcache_raw_collect (regcache
, i
, buf
+ i
*16);
526 xsnprintf (annex
, sizeof annex
, "%d/regs", fd
);
527 spu_proc_xfer_spu (annex
, NULL
, buf
, 0, sizeof buf
);
531 /* Override the to_xfer_partial routine. */
533 spu_xfer_partial (struct target_ops
*ops
,
534 enum target_object object
, const char *annex
,
535 gdb_byte
*readbuf
, const gdb_byte
*writebuf
,
536 ULONGEST offset
, LONGEST len
)
538 if (object
== TARGET_OBJECT_MEMORY
)
544 /* We must be stopped on a spu_run system call. */
545 if (!parse_spufs_run (&fd
, &addr
))
548 /* Use the "mem" spufs file to access SPU local store. */
549 xsnprintf (mem_annex
, sizeof mem_annex
, "%d/mem", fd
);
550 return spu_proc_xfer_spu (mem_annex
, readbuf
, writebuf
, offset
, len
);
556 /* Override the to_can_use_hw_breakpoint routine. */
558 spu_can_use_hw_breakpoint (int type
, int cnt
, int othertype
)
564 /* Initialize SPU native target. */
566 _initialize_spu_nat (void)
568 /* Generic ptrace methods. */
569 struct target_ops
*t
;
570 t
= inf_ptrace_target ();
572 /* Add SPU methods. */
573 t
->to_post_attach
= spu_child_post_attach
;
574 t
->to_post_startup_inferior
= spu_child_post_startup_inferior
;
575 t
->to_wait
= spu_child_wait
;
576 t
->to_fetch_registers
= spu_fetch_inferior_registers
;
577 t
->to_store_registers
= spu_store_inferior_registers
;
578 t
->to_xfer_partial
= spu_xfer_partial
;
579 t
->to_can_use_hw_breakpoint
= spu_can_use_hw_breakpoint
;
581 /* Register SPU target. */