1 /* SPU native-dependent code for GDB, the GNU debugger.
2 Copyright (C) 2006, 2007, 2008, 2009 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"
30 #include "gdbthread.h"
32 #include <sys/ptrace.h>
33 #include <asm/ptrace.h>
34 #include <sys/types.h>
35 #include <sys/param.h>
39 /* PPU side system calls. */
40 #define INSTR_SC 0x44000002
41 #define NR_spu_run 0x0116
44 /* Fetch PPU register REGNO. */
46 fetch_ppc_register (int regno
)
50 int tid
= TIDGET (inferior_ptid
);
52 tid
= PIDGET (inferior_ptid
);
55 /* If running as a 32-bit process on a 64-bit system, we attempt
56 to get the full 64-bit register content of the target process.
57 If the PPC special ptrace call fails, we're on a 32-bit system;
58 just fall through to the regular ptrace call in that case. */
63 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
64 (PTRACE_TYPE_ARG3
) (regno
* 8), buf
);
66 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
67 (PTRACE_TYPE_ARG3
) (regno
* 8 + 4), buf
+ 4);
69 return (ULONGEST
) *(uint64_t *)buf
;
74 res
= ptrace (PT_READ_U
, tid
,
75 (PTRACE_TYPE_ARG3
) (regno
* sizeof (PTRACE_TYPE_RET
)), 0);
79 xsnprintf (mess
, sizeof mess
, "reading PPC register #%d", regno
);
80 perror_with_name (_(mess
));
83 return (ULONGEST
) (unsigned long) res
;
86 /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
88 fetch_ppc_memory_1 (int tid
, ULONGEST memaddr
, PTRACE_TYPE_RET
*word
)
95 uint64_t addr_8
= (uint64_t) memaddr
;
96 ptrace (PPC_PTRACE_PEEKTEXT_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
100 *word
= ptrace (PT_READ_I
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, 0);
105 /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
107 store_ppc_memory_1 (int tid
, ULONGEST memaddr
, PTRACE_TYPE_RET word
)
111 #ifndef __powerpc64__
114 uint64_t addr_8
= (uint64_t) memaddr
;
115 ptrace (PPC_PTRACE_POKEDATA_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
119 ptrace (PT_WRITE_D
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, word
);
124 /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
126 fetch_ppc_memory (ULONGEST memaddr
, gdb_byte
*myaddr
, int len
)
130 ULONGEST addr
= memaddr
& -(ULONGEST
) sizeof (PTRACE_TYPE_RET
);
131 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
132 / sizeof (PTRACE_TYPE_RET
));
133 PTRACE_TYPE_RET
*buffer
;
135 int tid
= TIDGET (inferior_ptid
);
137 tid
= PIDGET (inferior_ptid
);
139 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
140 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
142 ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[i
]);
148 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
154 /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
156 store_ppc_memory (ULONGEST memaddr
, const gdb_byte
*myaddr
, int len
)
160 ULONGEST addr
= memaddr
& -(ULONGEST
) sizeof (PTRACE_TYPE_RET
);
161 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
162 / sizeof (PTRACE_TYPE_RET
));
163 PTRACE_TYPE_RET
*buffer
;
165 int tid
= TIDGET (inferior_ptid
);
167 tid
= PIDGET (inferior_ptid
);
169 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
171 if (addr
!= memaddr
|| len
< (int) sizeof (PTRACE_TYPE_RET
))
173 ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[0]);
180 ret
= fetch_ppc_memory_1 (tid
, addr
+ (count
- 1)
181 * sizeof (PTRACE_TYPE_RET
),
187 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
190 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
192 ret
= store_ppc_memory_1 (tid
, addr
, buffer
[i
]);
201 /* If the PPU thread is currently stopped on a spu_run system call,
202 return to FD and ADDR the file handle and NPC parameter address
203 used with the system call. Return non-zero if successful. */
205 parse_spufs_run (int *fd
, ULONGEST
*addr
)
208 ULONGEST pc
= fetch_ppc_register (32); /* nip */
210 /* Fetch instruction preceding current NIP. */
211 if (fetch_ppc_memory (pc
-4, buf
, 4) != 0)
213 /* It should be a "sc" instruction. */
214 if (extract_unsigned_integer (buf
, 4) != INSTR_SC
)
216 /* System call number should be NR_spu_run. */
217 if (fetch_ppc_register (0) != NR_spu_run
)
220 /* Register 3 contains fd, register 4 the NPC param pointer. */
221 *fd
= fetch_ppc_register (34); /* orig_gpr3 */
222 *addr
= fetch_ppc_register (4);
227 /* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,
228 using the /proc file system. */
230 spu_proc_xfer_spu (const char *annex
, gdb_byte
*readbuf
,
231 const gdb_byte
*writebuf
,
232 ULONGEST offset
, LONGEST len
)
237 int pid
= PIDGET (inferior_ptid
);
242 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
243 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
248 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
255 ret
= write (fd
, writebuf
, (size_t) len
);
257 ret
= read (fd
, readbuf
, (size_t) len
);
264 /* Inferior memory should contain an SPE executable image at location ADDR.
265 Allocate a BFD representing that executable. Return NULL on error. */
268 spu_bfd_iovec_open (struct bfd
*nbfd
, void *open_closure
)
274 spu_bfd_iovec_close (struct bfd
*nbfd
, void *stream
)
281 spu_bfd_iovec_pread (struct bfd
*abfd
, void *stream
, void *buf
,
282 file_ptr nbytes
, file_ptr offset
)
284 ULONGEST addr
= *(ULONGEST
*)stream
;
286 if (fetch_ppc_memory (addr
+ offset
, buf
, nbytes
) != 0)
288 bfd_set_error (bfd_error_invalid_operation
);
296 spu_bfd_iovec_stat (struct bfd
*abfd
, void *stream
, struct stat
*sb
)
298 /* We don't have an easy way of finding the size of embedded spu
299 images. We could parse the in-memory ELF header and section
300 table to find the extent of the last section but that seems
301 pointless when the size is needed only for checks of other
302 parsed values in dbxread.c. */
303 sb
->st_size
= INT_MAX
;
308 spu_bfd_open (ULONGEST addr
)
313 ULONGEST
*open_closure
= xmalloc (sizeof (ULONGEST
));
314 *open_closure
= addr
;
316 nbfd
= bfd_openr_iovec (xstrdup ("<in-memory>"), "elf32-spu",
317 spu_bfd_iovec_open
, open_closure
,
318 spu_bfd_iovec_pread
, spu_bfd_iovec_close
,
323 if (!bfd_check_format (nbfd
, bfd_object
))
329 /* Retrieve SPU name note and update BFD name. */
330 spu_name
= bfd_get_section_by_name (nbfd
, ".note.spu_name");
333 int sect_size
= bfd_section_size (nbfd
, spu_name
);
336 char *buf
= alloca (sect_size
- 20 + 1);
337 bfd_get_section_contents (nbfd
, spu_name
, buf
, 20, sect_size
- 20);
338 buf
[sect_size
- 20] = '\0';
340 xfree ((char *)nbfd
->filename
);
341 nbfd
->filename
= xstrdup (buf
);
348 /* INFERIOR_FD is a file handle passed by the inferior to the
349 spu_run system call. Assuming the SPE context was allocated
350 by the libspe library, try to retrieve the main SPE executable
351 file from its copy within the target process. */
353 spu_symbol_file_add_from_memory (int inferior_fd
)
362 /* Read object ID. */
363 xsnprintf (annex
, sizeof annex
, "%d/object-id", inferior_fd
);
364 len
= spu_proc_xfer_spu (annex
, id
, NULL
, 0, sizeof id
);
365 if (len
<= 0 || len
>= sizeof id
)
368 addr
= strtoulst (id
, NULL
, 16);
372 /* Open BFD representing SPE executable and read its symbols. */
373 nbfd
= spu_bfd_open (addr
);
375 symbol_file_add_from_bfd (nbfd
, 1, NULL
, 1, 0);
379 /* Override the post_startup_inferior routine to continue running
380 the inferior until the first spu_run system call. */
382 spu_child_post_startup_inferior (ptid_t ptid
)
387 int tid
= TIDGET (ptid
);
391 while (!parse_spufs_run (&fd
, &addr
))
393 ptrace (PT_SYSCALL
, tid
, (PTRACE_TYPE_ARG3
) 0, 0);
394 waitpid (tid
, NULL
, __WALL
| __WNOTHREAD
);
398 /* Override the post_attach routine to try load the SPE executable
399 file image from its copy inside the target process. */
401 spu_child_post_attach (int pid
)
406 /* Like child_post_startup_inferior, if we happened to attach to
407 the inferior while it wasn't currently in spu_run, continue
408 running it until we get back there. */
409 while (!parse_spufs_run (&fd
, &addr
))
411 ptrace (PT_SYSCALL
, pid
, (PTRACE_TYPE_ARG3
) 0, 0);
412 waitpid (pid
, NULL
, __WALL
| __WNOTHREAD
);
415 /* If the user has not provided an executable file, try to extract
416 the image from inside the target process. */
417 if (!get_exec_file (0))
418 spu_symbol_file_add_from_memory (fd
);
421 /* Wait for child PTID to do something. Return id of the child,
422 minus_one_ptid in case of error; store status into *OURSTATUS. */
424 spu_child_wait (struct target_ops
*ops
,
425 ptid_t ptid
, struct target_waitstatus
*ourstatus
)
433 set_sigint_trap (); /* Causes SIGINT to be passed on to the
436 pid
= waitpid (PIDGET (ptid
), &status
, 0);
437 if (pid
== -1 && errno
== ECHILD
)
438 /* Try again with __WCLONE to check cloned processes. */
439 pid
= waitpid (PIDGET (ptid
), &status
, __WCLONE
);
443 /* Make sure we don't report an event for the exit of the
444 original program, if we've detached from it. */
445 if (pid
!= -1 && !WIFSTOPPED (status
) && pid
!= PIDGET (inferior_ptid
))
451 clear_sigint_trap ();
453 while (pid
== -1 && save_errno
== EINTR
);
457 warning (_("Child process unexpectedly missing: %s"),
458 safe_strerror (save_errno
));
460 /* Claim it exited with unknown signal. */
461 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
462 ourstatus
->value
.sig
= TARGET_SIGNAL_UNKNOWN
;
463 return inferior_ptid
;
466 store_waitstatus (ourstatus
, status
);
467 return pid_to_ptid (pid
);
470 /* Override the fetch_inferior_register routine. */
472 spu_fetch_inferior_registers (struct target_ops
*ops
,
473 struct regcache
*regcache
, int regno
)
478 /* We must be stopped on a spu_run system call. */
479 if (!parse_spufs_run (&fd
, &addr
))
482 /* The ID register holds the spufs file handle. */
483 if (regno
== -1 || regno
== SPU_ID_REGNUM
)
486 store_unsigned_integer (buf
, 4, fd
);
487 regcache_raw_supply (regcache
, SPU_ID_REGNUM
, buf
);
490 /* The NPC register is found at ADDR. */
491 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
494 if (fetch_ppc_memory (addr
, buf
, 4) == 0)
495 regcache_raw_supply (regcache
, SPU_PC_REGNUM
, buf
);
498 /* The GPRs are found in the "regs" spufs file. */
499 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_GPRS
))
501 gdb_byte buf
[16 * SPU_NUM_GPRS
];
505 xsnprintf (annex
, sizeof annex
, "%d/regs", fd
);
506 if (spu_proc_xfer_spu (annex
, buf
, NULL
, 0, sizeof buf
) == sizeof buf
)
507 for (i
= 0; i
< SPU_NUM_GPRS
; i
++)
508 regcache_raw_supply (regcache
, i
, buf
+ i
*16);
512 /* Override the store_inferior_register routine. */
514 spu_store_inferior_registers (struct target_ops
*ops
,
515 struct regcache
*regcache
, int regno
)
520 /* We must be stopped on a spu_run system call. */
521 if (!parse_spufs_run (&fd
, &addr
))
524 /* The NPC register is found at ADDR. */
525 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
528 regcache_raw_collect (regcache
, SPU_PC_REGNUM
, buf
);
529 store_ppc_memory (addr
, buf
, 4);
532 /* The GPRs are found in the "regs" spufs file. */
533 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_GPRS
))
535 gdb_byte buf
[16 * SPU_NUM_GPRS
];
539 for (i
= 0; i
< SPU_NUM_GPRS
; i
++)
540 regcache_raw_collect (regcache
, i
, buf
+ i
*16);
542 xsnprintf (annex
, sizeof annex
, "%d/regs", fd
);
543 spu_proc_xfer_spu (annex
, NULL
, buf
, 0, sizeof buf
);
547 /* Override the to_xfer_partial routine. */
549 spu_xfer_partial (struct target_ops
*ops
,
550 enum target_object object
, const char *annex
,
551 gdb_byte
*readbuf
, const gdb_byte
*writebuf
,
552 ULONGEST offset
, LONGEST len
)
554 if (object
== TARGET_OBJECT_SPU
)
555 return spu_proc_xfer_spu (annex
, readbuf
, writebuf
, offset
, len
);
557 if (object
== TARGET_OBJECT_MEMORY
)
563 /* We must be stopped on a spu_run system call. */
564 if (!parse_spufs_run (&fd
, &addr
))
567 /* Use the "mem" spufs file to access SPU local store. */
568 xsnprintf (mem_annex
, sizeof mem_annex
, "%d/mem", fd
);
569 return spu_proc_xfer_spu (mem_annex
, readbuf
, writebuf
, offset
, len
);
575 /* Override the to_can_use_hw_breakpoint routine. */
577 spu_can_use_hw_breakpoint (int type
, int cnt
, int othertype
)
583 /* Initialize SPU native target. */
585 _initialize_spu_nat (void)
587 /* Generic ptrace methods. */
588 struct target_ops
*t
;
589 t
= inf_ptrace_target ();
591 /* Add SPU methods. */
592 t
->to_post_attach
= spu_child_post_attach
;
593 t
->to_post_startup_inferior
= spu_child_post_startup_inferior
;
594 t
->to_wait
= spu_child_wait
;
595 t
->to_fetch_registers
= spu_fetch_inferior_registers
;
596 t
->to_store_registers
= spu_store_inferior_registers
;
597 t
->to_xfer_partial
= spu_xfer_partial
;
598 t
->to_can_use_hw_breakpoint
= spu_can_use_hw_breakpoint
;
600 /* Register SPU target. */