1 /* SPU native-dependent code for GDB, the GNU debugger.
2 Copyright (C) 2006-2012 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"
33 #include <sys/ptrace.h>
34 #include <asm/ptrace.h>
35 #include <sys/types.h>
36 #include <sys/param.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 = TIDGET (inferior_ptid);
53 tid = PIDGET (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 = TIDGET (inferior_ptid);
138 tid = PIDGET (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 = TIDGET (inferior_ptid);
168 tid = PIDGET (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 = 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)
315 ULONGEST *open_closure = xmalloc (sizeof (ULONGEST));
316 *open_closure = addr;
318 nbfd = bfd_openr_iovec ("<in-memory>", "elf32-spu",
319 spu_bfd_iovec_open, open_closure,
320 spu_bfd_iovec_pread, spu_bfd_iovec_close,
324 nbfd = gdb_bfd_ref (nbfd);
326 if (!bfd_check_format (nbfd, bfd_object))
328 gdb_bfd_unref (nbfd);
332 /* Retrieve SPU name note and update BFD name. */
333 spu_name = bfd_get_section_by_name (nbfd, ".note.spu_name");
336 int sect_size = bfd_section_size (nbfd, spu_name);
339 char *buf = alloca (sect_size - 20 + 1);
340 bfd_get_section_contents (nbfd, spu_name, buf, 20, sect_size - 20);
341 buf[sect_size - 20] = '\0';
343 xfree ((char *)nbfd->filename);
344 nbfd->filename = xstrdup (buf);
351 /* INFERIOR_FD is a file handle passed by the inferior to the
352 spu_run system call. Assuming the SPE context was allocated
353 by the libspe library, try to retrieve the main SPE executable
354 file from its copy within the target process. */
356 spu_symbol_file_add_from_memory (int inferior_fd)
365 /* Read object ID. */
366 xsnprintf (annex, sizeof annex, "%d/object-id", inferior_fd);
367 len = spu_proc_xfer_spu (annex, id, NULL, 0, sizeof id);
368 if (len <= 0 || len >= sizeof id)
371 addr = strtoulst (id, NULL, 16);
375 /* Open BFD representing SPE executable and read its symbols. */
376 nbfd = spu_bfd_open (addr);
378 symbol_file_add_from_bfd (nbfd, SYMFILE_VERBOSE | SYMFILE_MAINLINE,
383 /* Override the post_startup_inferior routine to continue running
384 the inferior until the first spu_run system call. */
386 spu_child_post_startup_inferior (ptid_t ptid)
391 int tid = TIDGET (ptid);
395 while (!parse_spufs_run (&fd, &addr))
397 ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0);
398 waitpid (tid, NULL, __WALL | __WNOTHREAD);
402 /* Override the post_attach routine to try load the SPE executable
403 file image from its copy inside the target process. */
405 spu_child_post_attach (int pid)
410 /* Like child_post_startup_inferior, if we happened to attach to
411 the inferior while it wasn't currently in spu_run, continue
412 running it until we get back there. */
413 while (!parse_spufs_run (&fd, &addr))
415 ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0);
416 waitpid (pid, NULL, __WALL | __WNOTHREAD);
419 /* If the user has not provided an executable file, try to extract
420 the image from inside the target process. */
421 if (!get_exec_file (0))
422 spu_symbol_file_add_from_memory (fd);
425 /* Wait for child PTID to do something. Return id of the child,
426 minus_one_ptid in case of error; store status into *OURSTATUS. */
428 spu_child_wait (struct target_ops *ops,
429 ptid_t ptid, struct target_waitstatus *ourstatus, int options)
437 set_sigint_trap (); /* Causes SIGINT to be passed on to the
440 pid = waitpid (PIDGET (ptid), &status, 0);
441 if (pid == -1 && errno == ECHILD)
442 /* Try again with __WCLONE to check cloned processes. */
443 pid = waitpid (PIDGET (ptid), &status, __WCLONE);
447 /* Make sure we don't report an event for the exit of the
448 original program, if we've detached from it. */
449 if (pid != -1 && !WIFSTOPPED (status) && pid != PIDGET (inferior_ptid))
455 clear_sigint_trap ();
457 while (pid == -1 && save_errno == EINTR);
461 warning (_("Child process unexpectedly missing: %s"),
462 safe_strerror (save_errno));
464 /* Claim it exited with unknown signal. */
465 ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
466 ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
467 return inferior_ptid;
470 store_waitstatus (ourstatus, status);
471 return pid_to_ptid (pid);
474 /* Override the fetch_inferior_register routine. */
476 spu_fetch_inferior_registers (struct target_ops *ops,
477 struct regcache *regcache, int regno)
482 /* We must be stopped on a spu_run system call. */
483 if (!parse_spufs_run (&fd, &addr))
486 /* The ID register holds the spufs file handle. */
487 if (regno == -1 || regno == SPU_ID_REGNUM)
489 struct gdbarch *gdbarch = get_regcache_arch (regcache);
490 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
492 store_unsigned_integer (buf, 4, byte_order, fd);
493 regcache_raw_supply (regcache, SPU_ID_REGNUM, buf);
496 /* The NPC register is found at ADDR. */
497 if (regno == -1 || regno == SPU_PC_REGNUM)
500 if (fetch_ppc_memory (addr, buf, 4) == 0)
501 regcache_raw_supply (regcache, SPU_PC_REGNUM, buf);
504 /* The GPRs are found in the "regs" spufs file. */
505 if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
507 gdb_byte buf[16 * SPU_NUM_GPRS];
511 xsnprintf (annex, sizeof annex, "%d/regs", fd);
512 if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf)
513 for (i = 0; i < SPU_NUM_GPRS; i++)
514 regcache_raw_supply (regcache, i, buf + i*16);
518 /* Override the store_inferior_register routine. */
520 spu_store_inferior_registers (struct target_ops *ops,
521 struct regcache *regcache, int regno)
526 /* We must be stopped on a spu_run system call. */
527 if (!parse_spufs_run (&fd, &addr))
530 /* The NPC register is found at ADDR. */
531 if (regno == -1 || regno == SPU_PC_REGNUM)
534 regcache_raw_collect (regcache, SPU_PC_REGNUM, buf);
535 store_ppc_memory (addr, buf, 4);
538 /* The GPRs are found in the "regs" spufs file. */
539 if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
541 gdb_byte buf[16 * SPU_NUM_GPRS];
545 for (i = 0; i < SPU_NUM_GPRS; i++)
546 regcache_raw_collect (regcache, i, buf + i*16);
548 xsnprintf (annex, sizeof annex, "%d/regs", fd);
549 spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf);
553 /* Override the to_xfer_partial routine. */
555 spu_xfer_partial (struct target_ops *ops,
556 enum target_object object, const char *annex,
557 gdb_byte *readbuf, const gdb_byte *writebuf,
558 ULONGEST offset, LONGEST len)
560 if (object == TARGET_OBJECT_SPU)
561 return spu_proc_xfer_spu (annex, readbuf, writebuf, offset, len);
563 if (object == TARGET_OBJECT_MEMORY)
567 char mem_annex[32], lslr_annex[32];
572 /* We must be stopped on a spu_run system call. */
573 if (!parse_spufs_run (&fd, &addr))
576 /* Use the "mem" spufs file to access SPU local store. */
577 xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd);
578 ret = spu_proc_xfer_spu (mem_annex, readbuf, writebuf, offset, len);
582 /* SPU local store access wraps the address around at the
583 local store limit. We emulate this here. To avoid needing
584 an extra access to retrieve the LSLR, we only do that after
585 trying the original address first, and getting end-of-file. */
586 xsnprintf (lslr_annex, sizeof lslr_annex, "%d/lslr", fd);
587 memset (buf, 0, sizeof buf);
588 if (spu_proc_xfer_spu (lslr_annex, buf, NULL, 0, sizeof buf) <= 0)
591 lslr = strtoulst (buf, NULL, 16);
592 return spu_proc_xfer_spu (mem_annex, readbuf, writebuf,
599 /* Override the to_can_use_hw_breakpoint routine. */
601 spu_can_use_hw_breakpoint (int type, int cnt, int othertype)
607 /* Initialize SPU native target. */
609 _initialize_spu_nat (void)
611 /* Generic ptrace methods. */
612 struct target_ops *t;
613 t = inf_ptrace_target ();
615 /* Add SPU methods. */
616 t->to_post_attach = spu_child_post_attach;
617 t->to_post_startup_inferior = spu_child_post_startup_inferior;
618 t->to_wait = spu_child_wait;
619 t->to_fetch_registers = spu_fetch_inferior_registers;
620 t->to_store_registers = spu_store_inferior_registers;
621 t->to_xfer_partial = spu_xfer_partial;
622 t->to_can_use_hw_breakpoint = spu_can_use_hw_breakpoint;
624 /* Register SPU target. */