1 /* SPU native-dependent code for GDB, the GNU debugger.
2 Copyright (C) 2006-2013 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-child.h"
27 #include "inf-ptrace.h"
31 #include "gdbthread.h"
34 #include <sys/ptrace.h>
35 #include <asm/ptrace.h>
36 #include <sys/types.h>
40 /* PPU side system calls. */
41 #define INSTR_SC 0x44000002
42 #define NR_spu_run 0x0116
45 /* Fetch PPU register REGNO. */
47 fetch_ppc_register (int regno
)
51 int tid
= ptid_get_lwp (inferior_ptid
);
53 tid
= ptid_get_pid (inferior_ptid
);
56 /* If running as a 32-bit process on a 64-bit system, we attempt
57 to get the full 64-bit register content of the target process.
58 If the PPC special ptrace call fails, we're on a 32-bit system;
59 just fall through to the regular ptrace call in that case. */
64 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
65 (PTRACE_TYPE_ARG3
) (regno
* 8), buf
);
67 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
68 (PTRACE_TYPE_ARG3
) (regno
* 8 + 4), buf
+ 4);
70 return (ULONGEST
) *(uint64_t *)buf
;
75 res
= ptrace (PT_READ_U
, tid
,
76 (PTRACE_TYPE_ARG3
) (regno
* sizeof (PTRACE_TYPE_RET
)), 0);
80 xsnprintf (mess
, sizeof mess
, "reading PPC register #%d", regno
);
81 perror_with_name (_(mess
));
84 return (ULONGEST
) (unsigned long) res
;
87 /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
89 fetch_ppc_memory_1 (int tid
, ULONGEST memaddr
, PTRACE_TYPE_RET
*word
)
96 uint64_t addr_8
= (uint64_t) memaddr
;
97 ptrace (PPC_PTRACE_PEEKTEXT_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
101 *word
= ptrace (PT_READ_I
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, 0);
106 /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
108 store_ppc_memory_1 (int tid
, ULONGEST memaddr
, PTRACE_TYPE_RET word
)
112 #ifndef __powerpc64__
115 uint64_t addr_8
= (uint64_t) memaddr
;
116 ptrace (PPC_PTRACE_POKEDATA_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
120 ptrace (PT_WRITE_D
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, word
);
125 /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
127 fetch_ppc_memory (ULONGEST memaddr
, gdb_byte
*myaddr
, int len
)
131 ULONGEST addr
= memaddr
& -(ULONGEST
) sizeof (PTRACE_TYPE_RET
);
132 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
133 / sizeof (PTRACE_TYPE_RET
));
134 PTRACE_TYPE_RET
*buffer
;
136 int tid
= ptid_get_lwp (inferior_ptid
);
138 tid
= ptid_get_pid (inferior_ptid
);
140 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
141 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
143 ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[i
]);
149 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
155 /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
157 store_ppc_memory (ULONGEST memaddr
, const gdb_byte
*myaddr
, int len
)
161 ULONGEST addr
= memaddr
& -(ULONGEST
) sizeof (PTRACE_TYPE_RET
);
162 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
163 / sizeof (PTRACE_TYPE_RET
));
164 PTRACE_TYPE_RET
*buffer
;
166 int tid
= ptid_get_lwp (inferior_ptid
);
168 tid
= ptid_get_pid (inferior_ptid
);
170 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
172 if (addr
!= memaddr
|| len
< (int) sizeof (PTRACE_TYPE_RET
))
174 ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[0]);
181 ret
= fetch_ppc_memory_1 (tid
, addr
+ (count
- 1)
182 * sizeof (PTRACE_TYPE_RET
),
188 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
191 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
193 ret
= store_ppc_memory_1 (tid
, addr
, buffer
[i
]);
202 /* If the PPU thread is currently stopped on a spu_run system call,
203 return to FD and ADDR the file handle and NPC parameter address
204 used with the system call. Return non-zero if successful. */
206 parse_spufs_run (int *fd
, ULONGEST
*addr
)
208 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch ());
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, byte_order
) != 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
= ptid_get_pid (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
)
280 /* Zero means success. */
285 spu_bfd_iovec_pread (struct bfd
*abfd
, void *stream
, void *buf
,
286 file_ptr nbytes
, file_ptr offset
)
288 ULONGEST addr
= *(ULONGEST
*)stream
;
290 if (fetch_ppc_memory (addr
+ offset
, buf
, nbytes
) != 0)
292 bfd_set_error (bfd_error_invalid_operation
);
300 spu_bfd_iovec_stat (struct bfd
*abfd
, void *stream
, struct stat
*sb
)
302 /* We don't have an easy way of finding the size of embedded spu
303 images. We could parse the in-memory ELF header and section
304 table to find the extent of the last section but that seems
305 pointless when the size is needed only for checks of other
306 parsed values in dbxread.c. */
307 sb
->st_size
= INT_MAX
;
312 spu_bfd_open (ULONGEST addr
)
317 ULONGEST
*open_closure
= xmalloc (sizeof (ULONGEST
));
318 *open_closure
= addr
;
320 nbfd
= gdb_bfd_openr_iovec ("<in-memory>", "elf32-spu",
321 spu_bfd_iovec_open
, open_closure
,
322 spu_bfd_iovec_pread
, spu_bfd_iovec_close
,
327 if (!bfd_check_format (nbfd
, bfd_object
))
329 gdb_bfd_unref (nbfd
);
333 /* Retrieve SPU name note and update BFD name. */
334 spu_name
= bfd_get_section_by_name (nbfd
, ".note.spu_name");
337 int sect_size
= bfd_section_size (nbfd
, spu_name
);
340 char *buf
= alloca (sect_size
- 20 + 1);
341 bfd_get_section_contents (nbfd
, spu_name
, buf
, 20, sect_size
- 20);
342 buf
[sect_size
- 20] = '\0';
344 xfree ((char *)nbfd
->filename
);
345 nbfd
->filename
= xstrdup (buf
);
352 /* INFERIOR_FD is a file handle passed by the inferior to the
353 spu_run system call. Assuming the SPE context was allocated
354 by the libspe library, try to retrieve the main SPE executable
355 file from its copy within the target process. */
357 spu_symbol_file_add_from_memory (int inferior_fd
)
366 /* Read object ID. */
367 xsnprintf (annex
, sizeof annex
, "%d/object-id", inferior_fd
);
368 len
= spu_proc_xfer_spu (annex
, id
, NULL
, 0, sizeof id
);
369 if (len
<= 0 || len
>= sizeof id
)
372 addr
= strtoulst (id
, NULL
, 16);
376 /* Open BFD representing SPE executable and read its symbols. */
377 nbfd
= spu_bfd_open (addr
);
380 struct cleanup
*cleanup
= make_cleanup_bfd_unref (nbfd
);
382 symbol_file_add_from_bfd (nbfd
, SYMFILE_VERBOSE
| SYMFILE_MAINLINE
,
384 do_cleanups (cleanup
);
389 /* Override the post_startup_inferior routine to continue running
390 the inferior until the first spu_run system call. */
392 spu_child_post_startup_inferior (ptid_t ptid
)
397 int tid
= ptid_get_lwp (ptid
);
399 tid
= ptid_get_pid (ptid
);
401 while (!parse_spufs_run (&fd
, &addr
))
403 ptrace (PT_SYSCALL
, tid
, (PTRACE_TYPE_ARG3
) 0, 0);
404 waitpid (tid
, NULL
, __WALL
| __WNOTHREAD
);
408 /* Override the post_attach routine to try load the SPE executable
409 file image from its copy inside the target process. */
411 spu_child_post_attach (int pid
)
416 /* Like child_post_startup_inferior, if we happened to attach to
417 the inferior while it wasn't currently in spu_run, continue
418 running it until we get back there. */
419 while (!parse_spufs_run (&fd
, &addr
))
421 ptrace (PT_SYSCALL
, pid
, (PTRACE_TYPE_ARG3
) 0, 0);
422 waitpid (pid
, NULL
, __WALL
| __WNOTHREAD
);
425 /* If the user has not provided an executable file, try to extract
426 the image from inside the target process. */
427 if (!get_exec_file (0))
428 spu_symbol_file_add_from_memory (fd
);
431 /* Wait for child PTID to do something. Return id of the child,
432 minus_one_ptid in case of error; store status into *OURSTATUS. */
434 spu_child_wait (struct target_ops
*ops
,
435 ptid_t ptid
, struct target_waitstatus
*ourstatus
, int options
)
443 set_sigint_trap (); /* Causes SIGINT to be passed on to the
446 pid
= waitpid (ptid_get_pid (ptid
), &status
, 0);
447 if (pid
== -1 && errno
== ECHILD
)
448 /* Try again with __WCLONE to check cloned processes. */
449 pid
= waitpid (ptid_get_pid (ptid
), &status
, __WCLONE
);
453 /* Make sure we don't report an event for the exit of the
454 original program, if we've detached from it. */
455 if (pid
!= -1 && !WIFSTOPPED (status
)
456 && pid
!= ptid_get_pid (inferior_ptid
))
462 clear_sigint_trap ();
464 while (pid
== -1 && save_errno
== EINTR
);
468 warning (_("Child process unexpectedly missing: %s"),
469 safe_strerror (save_errno
));
471 /* Claim it exited with unknown signal. */
472 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
473 ourstatus
->value
.sig
= GDB_SIGNAL_UNKNOWN
;
474 return inferior_ptid
;
477 store_waitstatus (ourstatus
, status
);
478 return pid_to_ptid (pid
);
481 /* Override the fetch_inferior_register routine. */
483 spu_fetch_inferior_registers (struct target_ops
*ops
,
484 struct regcache
*regcache
, int regno
)
489 /* We must be stopped on a spu_run system call. */
490 if (!parse_spufs_run (&fd
, &addr
))
493 /* The ID register holds the spufs file handle. */
494 if (regno
== -1 || regno
== SPU_ID_REGNUM
)
496 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
497 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
499 store_unsigned_integer (buf
, 4, byte_order
, fd
);
500 regcache_raw_supply (regcache
, SPU_ID_REGNUM
, buf
);
503 /* The NPC register is found at ADDR. */
504 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
507 if (fetch_ppc_memory (addr
, buf
, 4) == 0)
508 regcache_raw_supply (regcache
, SPU_PC_REGNUM
, buf
);
511 /* The GPRs are found in the "regs" spufs file. */
512 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_GPRS
))
514 gdb_byte buf
[16 * SPU_NUM_GPRS
];
518 xsnprintf (annex
, sizeof annex
, "%d/regs", fd
);
519 if (spu_proc_xfer_spu (annex
, buf
, NULL
, 0, sizeof buf
) == sizeof buf
)
520 for (i
= 0; i
< SPU_NUM_GPRS
; i
++)
521 regcache_raw_supply (regcache
, i
, buf
+ i
*16);
525 /* Override the store_inferior_register routine. */
527 spu_store_inferior_registers (struct target_ops
*ops
,
528 struct regcache
*regcache
, int regno
)
533 /* We must be stopped on a spu_run system call. */
534 if (!parse_spufs_run (&fd
, &addr
))
537 /* The NPC register is found at ADDR. */
538 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
541 regcache_raw_collect (regcache
, SPU_PC_REGNUM
, buf
);
542 store_ppc_memory (addr
, buf
, 4);
545 /* The GPRs are found in the "regs" spufs file. */
546 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_GPRS
))
548 gdb_byte buf
[16 * SPU_NUM_GPRS
];
552 for (i
= 0; i
< SPU_NUM_GPRS
; i
++)
553 regcache_raw_collect (regcache
, i
, buf
+ i
*16);
555 xsnprintf (annex
, sizeof annex
, "%d/regs", fd
);
556 spu_proc_xfer_spu (annex
, NULL
, buf
, 0, sizeof buf
);
560 /* Override the to_xfer_partial routine. */
562 spu_xfer_partial (struct target_ops
*ops
,
563 enum target_object object
, const char *annex
,
564 gdb_byte
*readbuf
, const gdb_byte
*writebuf
,
565 ULONGEST offset
, LONGEST len
)
567 if (object
== TARGET_OBJECT_SPU
)
568 return spu_proc_xfer_spu (annex
, readbuf
, writebuf
, offset
, len
);
570 if (object
== TARGET_OBJECT_MEMORY
)
574 char mem_annex
[32], lslr_annex
[32];
579 /* We must be stopped on a spu_run system call. */
580 if (!parse_spufs_run (&fd
, &addr
))
583 /* Use the "mem" spufs file to access SPU local store. */
584 xsnprintf (mem_annex
, sizeof mem_annex
, "%d/mem", fd
);
585 ret
= spu_proc_xfer_spu (mem_annex
, readbuf
, writebuf
, offset
, len
);
589 /* SPU local store access wraps the address around at the
590 local store limit. We emulate this here. To avoid needing
591 an extra access to retrieve the LSLR, we only do that after
592 trying the original address first, and getting end-of-file. */
593 xsnprintf (lslr_annex
, sizeof lslr_annex
, "%d/lslr", fd
);
594 memset (buf
, 0, sizeof buf
);
595 if (spu_proc_xfer_spu (lslr_annex
, buf
, NULL
, 0, sizeof buf
) <= 0)
598 lslr
= strtoulst (buf
, NULL
, 16);
599 return spu_proc_xfer_spu (mem_annex
, readbuf
, writebuf
,
606 /* Override the to_can_use_hw_breakpoint routine. */
608 spu_can_use_hw_breakpoint (int type
, int cnt
, int othertype
)
614 /* Initialize SPU native target. */
616 _initialize_spu_nat (void)
618 /* Generic ptrace methods. */
619 struct target_ops
*t
;
620 t
= inf_ptrace_target ();
622 /* Add SPU methods. */
623 t
->to_post_attach
= spu_child_post_attach
;
624 t
->to_post_startup_inferior
= spu_child_post_startup_inferior
;
625 t
->to_wait
= spu_child_wait
;
626 t
->to_fetch_registers
= spu_fetch_inferior_registers
;
627 t
->to_store_registers
= spu_store_inferior_registers
;
628 t
->to_xfer_partial
= spu_xfer_partial
;
629 t
->to_can_use_hw_breakpoint
= spu_can_use_hw_breakpoint
;
631 /* Register SPU target. */