1 /* Low level interface to SPUs, for the remote server for GDB.
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/>. */
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 /* Get current thread ID (Linux task ID). */
55 #define current_tid ((struct inferior_list_entry *)current_inferior)->id
57 /* These are used in remote-utils.c. */
58 int using_threads = 0;
60 /* Defined in auto-generated file reg-spu.c. */
61 void init_registers_spu (void);
64 /* Fetch PPU register REGNO. */
66 fetch_ppc_register (int regno)
70 int tid = current_tid;
73 /* If running as a 32-bit process on a 64-bit system, we attempt
74 to get the full 64-bit register content of the target process.
75 If the PPC special ptrace call fails, we're on a 32-bit system;
76 just fall through to the regular ptrace call in that case. */
81 ptrace (PPC_PTRACE_PEEKUSR_3264, tid,
82 (PTRACE_TYPE_ARG3) (regno * 8), buf);
84 ptrace (PPC_PTRACE_PEEKUSR_3264, tid,
85 (PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4);
87 return (CORE_ADDR) *(unsigned long long *)buf;
92 res = ptrace (PT_READ_U, tid,
93 (PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0);
97 sprintf (mess, "reading PPC register #%d", regno);
98 perror_with_name (mess);
101 return (CORE_ADDR) (unsigned long) res;
104 /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
106 fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word)
110 #ifndef __powerpc64__
113 unsigned long long addr_8 = (unsigned long long) memaddr;
114 ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);
118 *word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0);
123 /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
125 store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word)
129 #ifndef __powerpc64__
132 unsigned long long addr_8 = (unsigned long long) memaddr;
133 ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);
137 ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word);
142 /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
144 fetch_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
148 CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);
149 int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)
150 / sizeof (PTRACE_TYPE_RET));
151 PTRACE_TYPE_RET *buffer;
153 int tid = current_tid;
155 buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET));
156 for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))
157 if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[i])) != 0)
161 (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
167 /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
169 store_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
173 CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);
174 int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)
175 / sizeof (PTRACE_TYPE_RET));
176 PTRACE_TYPE_RET *buffer;
178 int tid = current_tid;
180 buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET));
182 if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET))
183 if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0)
187 if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1)
188 * sizeof (PTRACE_TYPE_RET),
189 &buffer[count - 1])) != 0)
192 memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
195 for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))
196 if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0)
203 /* If the PPU thread is currently stopped on a spu_run system call,
204 return to FD and ADDR the file handle and NPC parameter address
205 used with the system call. Return non-zero if successful. */
207 parse_spufs_run (int *fd, CORE_ADDR *addr)
210 CORE_ADDR 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 (*(unsigned int *)buf != 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, unsigned char *readbuf,
233 const unsigned char *writebuf,
234 CORE_ADDR offset, int len)
243 sprintf (buf, "/proc/%ld/fd/%s", current_tid, annex);
244 fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
249 && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
256 ret = write (fd, writebuf, (size_t) len);
258 ret = read (fd, readbuf, (size_t) len);
265 /* Start an inferior process and returns its pid.
266 ALLARGS is a vector of program-name and args. */
268 spu_create_inferior (char *program, char **allargs)
274 perror_with_name ("fork");
278 ptrace (PTRACE_TRACEME, 0, 0, 0);
282 execv (program, allargs);
284 execvp (program, allargs);
286 fprintf (stderr, "Cannot exec %s: %s.\n", program,
292 add_thread (pid, NULL, pid);
296 /* Attach to an inferior process. */
298 spu_attach (unsigned long pid)
300 if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
302 fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid,
303 strerror (errno), errno);
308 add_thread (pid, NULL, pid);
312 /* Kill the inferior process. */
316 ptrace (PTRACE_KILL, current_tid, 0, 0);
319 /* Detach from inferior process. */
323 ptrace (PTRACE_DETACH, current_tid, 0, 0);
333 ret = waitpid (current_tid, &status, 0);
334 if (WIFEXITED (status) || WIFSIGNALED (status))
336 } while (ret != -1 || errno != ECHILD);
339 /* Return nonzero if the given thread is still alive. */
341 spu_thread_alive (unsigned long tid)
343 return tid == current_tid;
346 /* Resume process. */
348 spu_resume (struct thread_resume *resume_info)
350 while (resume_info->thread != -1
351 && resume_info->thread != current_tid)
354 if (resume_info->leave_stopped)
357 /* We don't support hardware single-stepping right now, assume
358 GDB knows to use software single-stepping. */
359 if (resume_info->step)
360 fprintf (stderr, "Hardware single-step not supported.\n");
362 regcache_invalidate ();
365 ptrace (PTRACE_CONT, current_tid, 0, resume_info->sig);
367 perror_with_name ("ptrace");
370 /* Wait for process, returns status. */
372 spu_wait (char *status)
374 int tid = current_tid;
380 ret = waitpid (tid, &w, WNOHANG | __WALL | __WNOTHREAD);
385 perror_with_name ("waitpid");
393 /* On the first wait, continue running the inferior until we are
394 blocked inside an spu_run system call. */
400 while (!parse_spufs_run (&fd, &addr))
402 ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0);
403 waitpid (tid, NULL, __WALL | __WNOTHREAD);
409 fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
412 return ((unsigned char) WEXITSTATUS (w));
414 else if (!WIFSTOPPED (w))
416 fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
419 return ((unsigned char) WTERMSIG (w));
422 /* After attach, we may have received a SIGSTOP. Do not return this
423 as signal to GDB, or else it will try to continue with SIGSTOP ... */
431 return ((unsigned char) WSTOPSIG (w));
434 /* Fetch inferior registers. */
436 spu_fetch_registers (int regno)
441 /* ??? Some callers use 0 to mean all registers. */
445 /* We must be stopped on a spu_run system call. */
446 if (!parse_spufs_run (&fd, &addr))
449 /* The ID register holds the spufs file handle. */
450 if (regno == -1 || regno == SPU_ID_REGNUM)
451 supply_register (SPU_ID_REGNUM, (char *)&fd);
453 /* The NPC register is found at ADDR. */
454 if (regno == -1 || regno == SPU_PC_REGNUM)
457 if (fetch_ppc_memory (addr, buf, 4) == 0)
458 supply_register (SPU_PC_REGNUM, buf);
461 /* The GPRs are found in the "regs" spufs file. */
462 if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS))
464 unsigned char buf[16*SPU_NUM_CORE_REGS];
468 sprintf (annex, "%d/regs", fd);
469 if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf)
470 for (i = 0; i < SPU_NUM_CORE_REGS; i++)
471 supply_register (i, buf + i*16);
475 /* Store inferior registers. */
477 spu_store_registers (int regno)
482 /* ??? Some callers use 0 to mean all registers. */
486 /* We must be stopped on a spu_run system call. */
487 if (!parse_spufs_run (&fd, &addr))
490 /* The NPC register is found at ADDR. */
491 if (regno == -1 || regno == SPU_PC_REGNUM)
494 collect_register (SPU_PC_REGNUM, buf);
495 store_ppc_memory (addr, buf, 4);
498 /* The GPRs are found in the "regs" spufs file. */
499 if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS))
501 unsigned char buf[16*SPU_NUM_CORE_REGS];
505 for (i = 0; i < SPU_NUM_CORE_REGS; i++)
506 collect_register (i, buf + i*16);
508 sprintf (annex, "%d/regs", fd);
509 spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf);
513 /* Copy LEN bytes from inferior's memory starting at MEMADDR
514 to debugger memory starting at MYADDR. */
516 spu_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
522 /* We must be stopped on a spu_run system call. */
523 if (!parse_spufs_run (&fd, &addr))
526 /* Use the "mem" spufs file to access SPU local store. */
527 sprintf (annex, "%d/mem", fd);
528 ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr, len);
529 return ret == len ? 0 : EIO;
532 /* Copy LEN bytes of data from debugger memory at MYADDR
533 to inferior's memory at MEMADDR.
534 On failure (cannot write the inferior)
535 returns the value of errno. */
537 spu_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
543 /* We must be stopped on a spu_run system call. */
544 if (!parse_spufs_run (&fd, &addr))
547 /* Use the "mem" spufs file to access SPU local store. */
548 sprintf (annex, "%d/mem", fd);
549 ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr, len);
550 return ret == len ? 0 : EIO;
553 /* Look up special symbols -- unneded here. */
555 spu_look_up_symbols (void)
559 /* Send signal to inferior. */
561 spu_request_interrupt (void)
563 syscall (SYS_tkill, current_tid, SIGINT);
566 static struct target_ops spu_target_ops = {
580 spu_request_interrupt,
589 hostio_last_error_from_errno,
593 initialize_low (void)
595 static const unsigned char breakpoint[] = { 0x00, 0x00, 0x3f, 0xff };
597 set_target_ops (&spu_target_ops);
598 set_breakpoint_data (breakpoint, sizeof breakpoint);
599 init_registers_spu ();