1 /* Low level interface to SPUs, for the remote server for GDB.
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/>. */
25 #include <sys/ptrace.h>
31 #include <sys/syscall.h>
33 /* Some older glibc versions do not define this. */
35 #define __WNOTHREAD 0x20000000 /* Don't wait on children of other
36 threads in this group */
39 #define PTRACE_TYPE_RET long
40 #define PTRACE_TYPE_ARG3 long
42 /* Number of registers. */
43 #define SPU_NUM_REGS 130
44 #define SPU_NUM_CORE_REGS 128
46 /* Special registers. */
47 #define SPU_ID_REGNUM 128
48 #define SPU_PC_REGNUM 129
50 /* PPU side system calls. */
51 #define INSTR_SC 0x44000002
52 #define NR_spu_run 0x0116
54 /* These are used in remote-utils.c. */
55 int using_threads = 0;
57 /* Defined in auto-generated file reg-spu.c. */
58 void init_registers_spu (void);
59 extern const struct target_desc *tdesc_spu;
61 /* Fetch PPU register REGNO. */
63 fetch_ppc_register (int regno)
67 int tid = ptid_get_lwp (current_ptid);
70 /* If running as a 32-bit process on a 64-bit system, we attempt
71 to get the full 64-bit register content of the target process.
72 If the PPC special ptrace call fails, we're on a 32-bit system;
73 just fall through to the regular ptrace call in that case. */
78 ptrace (PPC_PTRACE_PEEKUSR_3264, tid,
79 (PTRACE_TYPE_ARG3) (regno * 8), buf);
81 ptrace (PPC_PTRACE_PEEKUSR_3264, tid,
82 (PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4);
84 return (CORE_ADDR) *(unsigned long long *)buf;
89 res = ptrace (PT_READ_U, tid,
90 (PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0);
94 sprintf (mess, "reading PPC register #%d", regno);
95 perror_with_name (mess);
98 return (CORE_ADDR) (unsigned long) res;
101 /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
103 fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word)
107 #ifndef __powerpc64__
110 unsigned long long addr_8 = (unsigned long long) memaddr;
111 ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);
115 *word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0);
120 /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
122 store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word)
126 #ifndef __powerpc64__
129 unsigned long long addr_8 = (unsigned long long) memaddr;
130 ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);
134 ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word);
139 /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
141 fetch_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
145 CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);
146 int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)
147 / sizeof (PTRACE_TYPE_RET));
148 PTRACE_TYPE_RET *buffer;
150 int tid = ptid_get_lwp (current_ptid);
152 buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET));
153 for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))
154 if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[i])) != 0)
158 (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
164 /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
166 store_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
170 CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);
171 int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)
172 / sizeof (PTRACE_TYPE_RET));
173 PTRACE_TYPE_RET *buffer;
175 int tid = ptid_get_lwp (current_ptid);
177 buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET));
179 if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET))
180 if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0)
184 if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1)
185 * sizeof (PTRACE_TYPE_RET),
186 &buffer[count - 1])) != 0)
189 memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
192 for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))
193 if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0)
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, CORE_ADDR *addr)
207 CORE_ADDR pc = fetch_ppc_register (32); /* nip */
209 /* Fetch instruction preceding current NIP. */
210 if (fetch_ppc_memory (pc-4, (char *) &insn, 4) != 0)
212 /* It should be a "sc" instruction. */
213 if (insn != 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, unsigned char *readbuf,
230 const unsigned char *writebuf,
231 CORE_ADDR offset, int len)
240 sprintf (buf, "/proc/%ld/fd/%s", ptid_get_lwp (current_ptid), annex);
241 fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
246 && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
253 ret = write (fd, writebuf, (size_t) len);
255 ret = read (fd, readbuf, (size_t) len);
262 /* Start an inferior process and returns its pid.
263 ALLARGS is a vector of program-name and args. */
265 spu_create_inferior (char *program, char **allargs)
269 struct process_info *proc;
273 perror_with_name ("fork");
277 ptrace (PTRACE_TRACEME, 0, 0, 0);
281 execv (program, allargs);
283 execvp (program, allargs);
285 fprintf (stderr, "Cannot exec %s: %s.\n", program,
291 proc = add_process (pid, 0);
292 proc->tdesc = tdesc_spu;
294 ptid = ptid_build (pid, pid, 0);
295 add_thread (ptid, NULL);
299 /* Attach to an inferior process. */
301 spu_attach (unsigned long pid)
304 struct process_info *proc;
306 if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
308 fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid,
309 strerror (errno), errno);
314 proc = add_process (pid, 1);
315 proc->tdesc = tdesc_spu;
316 ptid = ptid_build (pid, pid, 0);
317 add_thread (ptid, NULL);
321 /* Kill the inferior process. */
326 struct process_info *process = find_process_pid (pid);
330 ptrace (PTRACE_KILL, pid, 0, 0);
333 ret = waitpid (pid, &status, 0);
334 if (WIFEXITED (status) || WIFSIGNALED (status))
336 } while (ret != -1 || errno != ECHILD);
339 remove_process (process);
343 /* Detach from inferior process. */
347 struct process_info *process = find_process_pid (pid);
351 ptrace (PTRACE_DETACH, pid, 0, 0);
354 remove_process (process);
359 spu_mourn (struct process_info *process)
361 remove_process (process);
370 ret = waitpid (pid, &status, 0);
371 if (WIFEXITED (status) || WIFSIGNALED (status))
373 } while (ret != -1 || errno != ECHILD);
376 /* Return nonzero if the given thread is still alive. */
378 spu_thread_alive (ptid_t ptid)
380 return ptid_equal (ptid, current_ptid);
383 /* Resume process. */
385 spu_resume (struct thread_resume *resume_info, size_t n)
389 for (i = 0; i < n; i++)
390 if (ptid_equal (resume_info[i].thread, minus_one_ptid)
391 || ptid_equal (resume_info[i].thread, current_ptid))
397 /* We don't support hardware single-stepping right now, assume
398 GDB knows to use software single-stepping. */
399 if (resume_info[i].kind == resume_step)
400 fprintf (stderr, "Hardware single-step not supported.\n");
402 regcache_invalidate ();
405 ptrace (PTRACE_CONT, ptid_get_lwp (current_ptid), 0, resume_info[i].sig);
407 perror_with_name ("ptrace");
410 /* Wait for process, returns status. */
412 spu_wait (ptid_t ptid, struct target_waitstatus *ourstatus, int options)
414 int pid = ptid_get_pid (ptid);
420 ret = waitpid (pid, &w, WNOHANG | __WALL | __WNOTHREAD);
425 perror_with_name ("waitpid");
433 /* On the first wait, continue running the inferior until we are
434 blocked inside an spu_run system call. */
440 while (!parse_spufs_run (&fd, &addr))
442 ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0);
443 waitpid (pid, NULL, __WALL | __WNOTHREAD);
449 fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
450 ourstatus->kind = TARGET_WAITKIND_EXITED;
451 ourstatus->value.integer = WEXITSTATUS (w);
453 return pid_to_ptid (ret);
455 else if (!WIFSTOPPED (w))
457 fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
458 ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
459 ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w));
461 return pid_to_ptid (ret);
464 /* After attach, we may have received a SIGSTOP. Do not return this
465 as signal to GDB, or else it will try to continue with SIGSTOP ... */
468 ourstatus->kind = TARGET_WAITKIND_STOPPED;
469 ourstatus->value.sig = GDB_SIGNAL_0;
470 return ptid_build (ret, ret, 0);
473 ourstatus->kind = TARGET_WAITKIND_STOPPED;
474 ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w));
475 return ptid_build (ret, ret, 0);
478 /* Fetch inferior registers. */
480 spu_fetch_registers (struct regcache *regcache, int regno)
485 /* We must be stopped on a spu_run system call. */
486 if (!parse_spufs_run (&fd, &addr))
489 /* The ID register holds the spufs file handle. */
490 if (regno == -1 || regno == SPU_ID_REGNUM)
491 supply_register (regcache, SPU_ID_REGNUM, (char *)&fd);
493 /* The NPC register is found at ADDR. */
494 if (regno == -1 || regno == SPU_PC_REGNUM)
497 if (fetch_ppc_memory (addr, buf, 4) == 0)
498 supply_register (regcache, SPU_PC_REGNUM, buf);
501 /* The GPRs are found in the "regs" spufs file. */
502 if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS))
504 unsigned char buf[16*SPU_NUM_CORE_REGS];
508 sprintf (annex, "%d/regs", fd);
509 if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf)
510 for (i = 0; i < SPU_NUM_CORE_REGS; i++)
511 supply_register (regcache, i, buf + i*16);
515 /* Store inferior registers. */
517 spu_store_registers (struct regcache *regcache, int regno)
522 /* ??? Some callers use 0 to mean all registers. */
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 collect_register (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_CORE_REGS))
541 unsigned char buf[16*SPU_NUM_CORE_REGS];
545 for (i = 0; i < SPU_NUM_CORE_REGS; i++)
546 collect_register (regcache, i, buf + i*16);
548 sprintf (annex, "%d/regs", fd);
549 spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf);
553 /* Copy LEN bytes from inferior's memory starting at MEMADDR
554 to debugger memory starting at MYADDR. */
556 spu_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
560 char annex[32], lslr_annex[32], buf[32];
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 sprintf (annex, "%d/mem", fd);
569 ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr, len);
571 return ret == len ? 0 : EIO;
573 /* SPU local store access wraps the address around at the
574 local store limit. We emulate this here. To avoid needing
575 an extra access to retrieve the LSLR, we only do that after
576 trying the original address first, and getting end-of-file. */
577 sprintf (lslr_annex, "%d/lslr", fd);
578 memset (buf, 0, sizeof buf);
579 if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL,
583 lslr = strtoul (buf, NULL, 16);
584 ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr & lslr, len);
586 return ret == len ? 0 : EIO;
589 /* Copy LEN bytes of data from debugger memory at MYADDR
590 to inferior's memory at MEMADDR.
591 On failure (cannot write the inferior)
592 returns the value of errno. */
594 spu_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
598 char annex[32], lslr_annex[32], buf[32];
601 /* We must be stopped on a spu_run system call. */
602 if (!parse_spufs_run (&fd, &addr))
605 /* Use the "mem" spufs file to access SPU local store. */
606 sprintf (annex, "%d/mem", fd);
607 ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr, len);
609 return ret == len ? 0 : EIO;
611 /* SPU local store access wraps the address around at the
612 local store limit. We emulate this here. To avoid needing
613 an extra access to retrieve the LSLR, we only do that after
614 trying the original address first, and getting end-of-file. */
615 sprintf (lslr_annex, "%d/lslr", fd);
616 memset (buf, 0, sizeof buf);
617 if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL,
621 lslr = strtoul (buf, NULL, 16);
622 ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr & lslr, len);
624 return ret == len ? 0 : EIO;
627 /* Look up special symbols -- unneded here. */
629 spu_look_up_symbols (void)
633 /* Send signal to inferior. */
635 spu_request_interrupt (void)
637 syscall (SYS_tkill, ptid_get_lwp (current_ptid), SIGINT);
640 static struct target_ops spu_target_ops = {
652 NULL, /* prepare_to_access_memory */
653 NULL, /* done_accessing_memory */
657 spu_request_interrupt,
666 hostio_last_error_from_errno,
670 initialize_low (void)
672 static const unsigned char breakpoint[] = { 0x00, 0x00, 0x3f, 0xff };
674 set_target_ops (&spu_target_ops);
675 set_breakpoint_data (breakpoint, sizeof breakpoint);
676 init_registers_spu ();