1 /* SPU native-dependent code for GDB, the GNU debugger.
2 Copyright (C) 2006, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
23 #include "gdb_string.h"
26 #include "inf-ptrace.h"
31 #include <sys/ptrace.h>
32 #include <asm/ptrace.h>
33 #include <sys/types.h>
34 #include <sys/param.h>
38 /* PPU side system calls. */
39 #define INSTR_SC 0x44000002
40 #define NR_spu_run 0x0116
43 /* Fetch PPU register REGNO. */
45 fetch_ppc_register (int regno
)
49 int tid
= TIDGET (inferior_ptid
);
51 tid
= PIDGET (inferior_ptid
);
54 /* If running as a 32-bit process on a 64-bit system, we attempt
55 to get the full 64-bit register content of the target process.
56 If the PPC special ptrace call fails, we're on a 32-bit system;
57 just fall through to the regular ptrace call in that case. */
62 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
63 (PTRACE_TYPE_ARG3
) (regno
* 8), buf
);
65 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
66 (PTRACE_TYPE_ARG3
) (regno
* 8 + 4), buf
+ 4);
68 return (ULONGEST
) *(uint64_t *)buf
;
73 res
= ptrace (PT_READ_U
, tid
,
74 (PTRACE_TYPE_ARG3
) (regno
* sizeof (PTRACE_TYPE_RET
)), 0);
78 xsnprintf (mess
, sizeof mess
, "reading PPC register #%d", regno
);
79 perror_with_name (_(mess
));
82 return (ULONGEST
) (unsigned long) res
;
85 /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
87 fetch_ppc_memory_1 (int tid
, ULONGEST memaddr
, PTRACE_TYPE_RET
*word
)
94 uint64_t addr_8
= (uint64_t) memaddr
;
95 ptrace (PPC_PTRACE_PEEKTEXT_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
99 *word
= ptrace (PT_READ_I
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, 0);
104 /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
106 store_ppc_memory_1 (int tid
, ULONGEST memaddr
, PTRACE_TYPE_RET word
)
110 #ifndef __powerpc64__
113 uint64_t addr_8
= (uint64_t) memaddr
;
114 ptrace (PPC_PTRACE_POKEDATA_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
118 ptrace (PT_WRITE_D
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, word
);
123 /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
125 fetch_ppc_memory (ULONGEST memaddr
, gdb_byte
*myaddr
, int len
)
129 ULONGEST addr
= memaddr
& -(ULONGEST
) sizeof (PTRACE_TYPE_RET
);
130 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
131 / sizeof (PTRACE_TYPE_RET
));
132 PTRACE_TYPE_RET
*buffer
;
134 int tid
= TIDGET (inferior_ptid
);
136 tid
= PIDGET (inferior_ptid
);
138 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
139 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
141 ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[i
]);
147 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
153 /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
155 store_ppc_memory (ULONGEST memaddr
, const gdb_byte
*myaddr
, int len
)
159 ULONGEST addr
= memaddr
& -(ULONGEST
) sizeof (PTRACE_TYPE_RET
);
160 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
161 / sizeof (PTRACE_TYPE_RET
));
162 PTRACE_TYPE_RET
*buffer
;
164 int tid
= TIDGET (inferior_ptid
);
166 tid
= PIDGET (inferior_ptid
);
168 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
170 if (addr
!= memaddr
|| len
< (int) sizeof (PTRACE_TYPE_RET
))
172 ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[0]);
179 ret
= fetch_ppc_memory_1 (tid
, addr
+ (count
- 1)
180 * sizeof (PTRACE_TYPE_RET
),
186 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
189 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
191 ret
= store_ppc_memory_1 (tid
, addr
, buffer
[i
]);
200 /* If the PPU thread is currently stopped on a spu_run system call,
201 return to FD and ADDR the file handle and NPC parameter address
202 used with the system call. Return non-zero if successful. */
204 parse_spufs_run (int *fd
, ULONGEST
*addr
)
207 ULONGEST pc
= fetch_ppc_register (32); /* nip */
209 /* Fetch instruction preceding current NIP. */
210 if (fetch_ppc_memory (pc
-4, buf
, 4) != 0)
212 /* It should be a "sc" instruction. */
213 if (extract_unsigned_integer (buf
, 4) != INSTR_SC
)
215 /* System call number should be NR_spu_run. */
216 if (fetch_ppc_register (0) != NR_spu_run
)
219 /* Register 3 contains fd, register 4 the NPC param pointer. */
220 *fd
= fetch_ppc_register (34); /* orig_gpr3 */
221 *addr
= fetch_ppc_register (4);
226 /* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,
227 using the /proc file system. */
229 spu_proc_xfer_spu (const char *annex
, gdb_byte
*readbuf
,
230 const gdb_byte
*writebuf
,
231 ULONGEST offset
, LONGEST len
)
236 int pid
= PIDGET (inferior_ptid
);
241 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
242 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
247 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
254 ret
= write (fd
, writebuf
, (size_t) len
);
256 ret
= read (fd
, readbuf
, (size_t) len
);
263 /* Inferior memory should contain an SPE executable image at location ADDR.
264 Allocate a BFD representing that executable. Return NULL on error. */
267 spu_bfd_iovec_open (struct bfd
*nbfd
, void *open_closure
)
273 spu_bfd_iovec_close (struct bfd
*nbfd
, void *stream
)
280 spu_bfd_iovec_pread (struct bfd
*abfd
, void *stream
, void *buf
,
281 file_ptr nbytes
, file_ptr offset
)
283 ULONGEST addr
= *(ULONGEST
*)stream
;
285 if (fetch_ppc_memory (addr
+ offset
, buf
, nbytes
) != 0)
287 bfd_set_error (bfd_error_invalid_operation
);
295 spu_bfd_iovec_stat (struct bfd
*abfd
, void *stream
, struct stat
*sb
)
297 /* We don't have an easy way of finding the size of embedded spu
298 images. We could parse the in-memory ELF header and section
299 table to find the extent of the last section but that seems
300 pointless when the size is needed only for checks of other
301 parsed values in dbxread.c. */
302 sb
->st_size
= INT_MAX
;
307 spu_bfd_open (ULONGEST addr
)
311 ULONGEST
*open_closure
= xmalloc (sizeof (ULONGEST
));
312 *open_closure
= addr
;
314 nbfd
= bfd_openr_iovec (xstrdup ("<in-memory>"), "elf32-spu",
315 spu_bfd_iovec_open
, open_closure
,
316 spu_bfd_iovec_pread
, spu_bfd_iovec_close
,
321 if (!bfd_check_format (nbfd
, bfd_object
))
330 /* INFERIOR_FD is a file handle passed by the inferior to the
331 spu_run system call. Assuming the SPE context was allocated
332 by the libspe library, try to retrieve the main SPE executable
333 file from its copy within the target process. */
335 spu_symbol_file_add_from_memory (int inferior_fd
)
344 /* Read object ID. */
345 xsnprintf (annex
, sizeof annex
, "%d/object-id", inferior_fd
);
346 len
= spu_proc_xfer_spu (annex
, id
, NULL
, 0, sizeof id
);
347 if (len
<= 0 || len
>= sizeof id
)
350 addr
= strtoulst (id
, NULL
, 16);
354 /* Open BFD representing SPE executable and read its symbols. */
355 nbfd
= spu_bfd_open (addr
);
357 symbol_file_add_from_bfd (nbfd
, 0, NULL
, 1, 0);
361 /* Override the post_startup_inferior routine to continue running
362 the inferior until the first spu_run system call. */
364 spu_child_post_startup_inferior (ptid_t ptid
)
369 int tid
= TIDGET (ptid
);
373 while (!parse_spufs_run (&fd
, &addr
))
375 ptrace (PT_SYSCALL
, tid
, (PTRACE_TYPE_ARG3
) 0, 0);
376 waitpid (tid
, NULL
, __WALL
| __WNOTHREAD
);
380 /* Override the post_attach routine to try load the SPE executable
381 file image from its copy inside the target process. */
383 spu_child_post_attach (int pid
)
388 /* Like child_post_startup_inferior, if we happened to attach to
389 the inferior while it wasn't currently in spu_run, continue
390 running it until we get back there. */
391 while (!parse_spufs_run (&fd
, &addr
))
393 ptrace (PT_SYSCALL
, pid
, (PTRACE_TYPE_ARG3
) 0, 0);
394 waitpid (pid
, NULL
, __WALL
| __WNOTHREAD
);
397 /* If the user has not provided an executable file, try to extract
398 the image from inside the target process. */
399 if (!get_exec_file (0))
400 spu_symbol_file_add_from_memory (fd
);
403 /* Wait for child PTID to do something. Return id of the child,
404 minus_one_ptid in case of error; store status into *OURSTATUS. */
406 spu_child_wait (ptid_t ptid
, struct target_waitstatus
*ourstatus
)
414 set_sigint_trap (); /* Causes SIGINT to be passed on to the
418 pid
= waitpid (PIDGET (ptid
), &status
, 0);
419 if (pid
== -1 && errno
== ECHILD
)
420 /* Try again with __WCLONE to check cloned processes. */
421 pid
= waitpid (PIDGET (ptid
), &status
, __WCLONE
);
425 /* Make sure we don't report an event for the exit of the
426 original program, if we've detached from it. */
427 if (pid
!= -1 && !WIFSTOPPED (status
) && pid
!= PIDGET (inferior_ptid
))
434 clear_sigint_trap ();
436 while (pid
== -1 && save_errno
== EINTR
);
440 warning (_("Child process unexpectedly missing: %s"),
441 safe_strerror (save_errno
));
443 /* Claim it exited with unknown signal. */
444 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
445 ourstatus
->value
.sig
= TARGET_SIGNAL_UNKNOWN
;
446 return minus_one_ptid
;
449 store_waitstatus (ourstatus
, status
);
450 return pid_to_ptid (pid
);
453 /* Override the fetch_inferior_register routine. */
455 spu_fetch_inferior_registers (struct regcache
*regcache
, int regno
)
460 /* We must be stopped on a spu_run system call. */
461 if (!parse_spufs_run (&fd
, &addr
))
464 /* The ID register holds the spufs file handle. */
465 if (regno
== -1 || regno
== SPU_ID_REGNUM
)
468 store_unsigned_integer (buf
, 4, fd
);
469 regcache_raw_supply (regcache
, SPU_ID_REGNUM
, buf
);
472 /* The NPC register is found at ADDR. */
473 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
476 if (fetch_ppc_memory (addr
, buf
, 4) == 0)
477 regcache_raw_supply (regcache
, SPU_PC_REGNUM
, buf
);
480 /* The GPRs are found in the "regs" spufs file. */
481 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_GPRS
))
483 gdb_byte buf
[16 * SPU_NUM_GPRS
];
487 xsnprintf (annex
, sizeof annex
, "%d/regs", fd
);
488 if (spu_proc_xfer_spu (annex
, buf
, NULL
, 0, sizeof buf
) == sizeof buf
)
489 for (i
= 0; i
< SPU_NUM_GPRS
; i
++)
490 regcache_raw_supply (regcache
, i
, buf
+ i
*16);
494 /* Override the store_inferior_register routine. */
496 spu_store_inferior_registers (struct regcache
*regcache
, int regno
)
501 /* We must be stopped on a spu_run system call. */
502 if (!parse_spufs_run (&fd
, &addr
))
505 /* The NPC register is found at ADDR. */
506 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
509 regcache_raw_collect (regcache
, SPU_PC_REGNUM
, buf
);
510 store_ppc_memory (addr
, buf
, 4);
513 /* The GPRs are found in the "regs" spufs file. */
514 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_GPRS
))
516 gdb_byte buf
[16 * SPU_NUM_GPRS
];
520 for (i
= 0; i
< SPU_NUM_GPRS
; i
++)
521 regcache_raw_collect (regcache
, i
, buf
+ i
*16);
523 xsnprintf (annex
, sizeof annex
, "%d/regs", fd
);
524 spu_proc_xfer_spu (annex
, NULL
, buf
, 0, sizeof buf
);
528 /* Override the to_xfer_partial routine. */
530 spu_xfer_partial (struct target_ops
*ops
,
531 enum target_object object
, const char *annex
,
532 gdb_byte
*readbuf
, const gdb_byte
*writebuf
,
533 ULONGEST offset
, LONGEST len
)
535 if (object
== TARGET_OBJECT_SPU
)
536 return spu_proc_xfer_spu (annex
, readbuf
, writebuf
, offset
, 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. */