1 /* Low level interface to SPUs, for the remote server for GDB.
2 Copyright (C) 2006, 2007 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 2 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, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
27 #include <sys/ptrace.h>
33 #include <sys/syscall.h>
35 /* Some older glibc versions do not define this. */
37 #define __WNOTHREAD 0x20000000 /* Don't wait on children of other
38 threads in this group */
41 #define PTRACE_TYPE_RET long
42 #define PTRACE_TYPE_ARG3 long
44 /* Number of registers. */
45 #define SPU_NUM_REGS 130
46 #define SPU_NUM_CORE_REGS 128
48 /* Special registers. */
49 #define SPU_ID_REGNUM 128
50 #define SPU_PC_REGNUM 129
52 /* PPU side system calls. */
53 #define INSTR_SC 0x44000002
54 #define NR_spu_run 0x0116
56 /* Get current thread ID (Linux task ID). */
57 #define current_tid ((struct inferior_list_entry *)current_inferior)->id
59 /* These are used in remote-utils.c. */
60 int using_threads
= 0;
63 /* Fetch PPU register REGNO. */
65 fetch_ppc_register (int regno
)
69 int tid
= current_tid
;
72 /* If running as a 32-bit process on a 64-bit system, we attempt
73 to get the full 64-bit register content of the target process.
74 If the PPC special ptrace call fails, we're on a 32-bit system;
75 just fall through to the regular ptrace call in that case. */
80 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
81 (PTRACE_TYPE_ARG3
) (regno
* 8), buf
);
83 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
84 (PTRACE_TYPE_ARG3
) (regno
* 8 + 4), buf
+ 4);
86 return (CORE_ADDR
) *(unsigned long long *)buf
;
91 res
= ptrace (PT_READ_U
, tid
,
92 (PTRACE_TYPE_ARG3
) (regno
* sizeof (PTRACE_TYPE_RET
)), 0);
96 sprintf (mess
, "reading PPC register #%d", regno
);
97 perror_with_name (mess
);
100 return (CORE_ADDR
) (unsigned long) res
;
103 /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
105 fetch_ppc_memory_1 (int tid
, CORE_ADDR memaddr
, PTRACE_TYPE_RET
*word
)
109 #ifndef __powerpc64__
112 unsigned long long addr_8
= (unsigned long long) memaddr
;
113 ptrace (PPC_PTRACE_PEEKTEXT_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
117 *word
= ptrace (PT_READ_I
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, 0);
122 /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
124 store_ppc_memory_1 (int tid
, CORE_ADDR memaddr
, PTRACE_TYPE_RET word
)
128 #ifndef __powerpc64__
131 unsigned long long addr_8
= (unsigned long long) memaddr
;
132 ptrace (PPC_PTRACE_POKEDATA_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
136 ptrace (PT_WRITE_D
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, word
);
141 /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
143 fetch_ppc_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
147 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_TYPE_RET
);
148 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
149 / sizeof (PTRACE_TYPE_RET
));
150 PTRACE_TYPE_RET
*buffer
;
152 int tid
= current_tid
;
154 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
155 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
156 if ((ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[i
])) != 0)
160 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
166 /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
168 store_ppc_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
172 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_TYPE_RET
);
173 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
174 / sizeof (PTRACE_TYPE_RET
));
175 PTRACE_TYPE_RET
*buffer
;
177 int tid
= current_tid
;
179 buffer
= (PTRACE_TYPE_RET
*) alloca (count
* sizeof (PTRACE_TYPE_RET
));
181 if (addr
!= memaddr
|| len
< (int) sizeof (PTRACE_TYPE_RET
))
182 if ((ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[0])) != 0)
186 if ((ret
= fetch_ppc_memory_1 (tid
, addr
+ (count
- 1)
187 * sizeof (PTRACE_TYPE_RET
),
188 &buffer
[count
- 1])) != 0)
191 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
194 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
195 if ((ret
= store_ppc_memory_1 (tid
, addr
, buffer
[i
])) != 0)
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
, CORE_ADDR
*addr
)
209 CORE_ADDR pc
= fetch_ppc_register (32); /* nip */
211 /* Fetch instruction preceding current NIP. */
212 if (fetch_ppc_memory (pc
-4, buf
, 4) != 0)
214 /* It should be a "sc" instruction. */
215 if (*(unsigned int *)buf
!= INSTR_SC
)
217 /* System call number should be NR_spu_run. */
218 if (fetch_ppc_register (0) != NR_spu_run
)
221 /* Register 3 contains fd, register 4 the NPC param pointer. */
222 *fd
= fetch_ppc_register (34); /* orig_gpr3 */
223 *addr
= fetch_ppc_register (4);
228 /* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,
229 using the /proc file system. */
231 spu_proc_xfer_spu (const char *annex
, unsigned char *readbuf
,
232 const unsigned char *writebuf
,
233 CORE_ADDR offset
, int len
)
242 sprintf (buf
, "/proc/%ld/fd/%s", current_tid
, 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 /* Start an inferior process and returns its pid.
265 ALLARGS is a vector of program-name and args. */
267 spu_create_inferior (char *program
, char **allargs
)
273 perror_with_name ("fork");
277 ptrace (PTRACE_TRACEME
, 0, 0, 0);
281 execv (program
, allargs
);
283 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
289 add_thread (pid
, NULL
, pid
);
293 /* Attach to an inferior process. */
295 spu_attach (unsigned long pid
)
297 if (ptrace (PTRACE_ATTACH
, pid
, 0, 0) != 0)
299 fprintf (stderr
, "Cannot attach to process %ld: %s (%d)\n", pid
,
300 strerror (errno
), errno
);
305 add_thread (pid
, NULL
, pid
);
309 /* Kill the inferior process. */
313 ptrace (PTRACE_KILL
, current_tid
, 0, 0);
316 /* Detach from inferior process. */
320 ptrace (PTRACE_DETACH
, current_tid
, 0, 0);
323 /* Return nonzero if the given thread is still alive. */
325 spu_thread_alive (unsigned long tid
)
327 return tid
== current_tid
;
330 /* Resume process. */
332 spu_resume (struct thread_resume
*resume_info
)
334 while (resume_info
->thread
!= -1
335 && resume_info
->thread
!= current_tid
)
341 if (resume_info
->leave_stopped
)
344 /* We don't support hardware single-stepping right now, assume
345 GDB knows to use software single-stepping. */
346 if (resume_info
->step
)
347 fprintf (stderr
, "Hardware single-step not supported.\n");
349 regcache_invalidate ();
352 ptrace (PTRACE_CONT
, current_tid
, 0, resume_info
->sig
);
354 perror_with_name ("ptrace");
357 /* Wait for process, returns status. */
359 spu_wait (char *status
)
361 int tid
= current_tid
;
370 ret
= waitpid (tid
, &w
, WNOHANG
| __WALL
| __WNOTHREAD
);
375 perror_with_name ("waitpid");
383 /* On the first wait, continue running the inferior until we are
384 blocked inside an spu_run system call. */
390 while (!parse_spufs_run (&fd
, &addr
))
392 ptrace (PT_SYSCALL
, tid
, (PTRACE_TYPE_ARG3
) 0, 0);
393 waitpid (tid
, NULL
, __WALL
| __WNOTHREAD
);
401 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
404 return ((unsigned char) WEXITSTATUS (w
));
406 else if (!WIFSTOPPED (w
))
408 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
411 return ((unsigned char) WTERMSIG (w
));
414 /* After attach, we may have received a SIGSTOP. Do not return this
415 as signal to GDB, or else it will try to continue with SIGSTOP ... */
423 return ((unsigned char) WSTOPSIG (w
));
426 /* Fetch inferior registers. */
428 spu_fetch_registers (int regno
)
433 /* ??? Some callers use 0 to mean all registers. */
437 /* We must be stopped on a spu_run system call. */
438 if (!parse_spufs_run (&fd
, &addr
))
441 /* The ID register holds the spufs file handle. */
442 if (regno
== -1 || regno
== SPU_ID_REGNUM
)
443 supply_register (SPU_ID_REGNUM
, (char *)&fd
);
445 /* The NPC register is found at ADDR. */
446 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
449 if (fetch_ppc_memory (addr
, buf
, 4) == 0)
450 supply_register (SPU_PC_REGNUM
, buf
);
453 /* The GPRs are found in the "regs" spufs file. */
454 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_CORE_REGS
))
456 unsigned char buf
[16*SPU_NUM_CORE_REGS
];
460 sprintf (annex
, "%d/regs", fd
);
461 if (spu_proc_xfer_spu (annex
, buf
, NULL
, 0, sizeof buf
) == sizeof buf
)
462 for (i
= 0; i
< SPU_NUM_CORE_REGS
; i
++)
463 supply_register (i
, buf
+ i
*16);
467 /* Store inferior registers. */
469 spu_store_registers (int regno
)
474 /* ??? Some callers use 0 to mean all registers. */
478 /* We must be stopped on a spu_run system call. */
479 if (!parse_spufs_run (&fd
, &addr
))
482 /* The NPC register is found at ADDR. */
483 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
486 collect_register (SPU_PC_REGNUM
, buf
);
487 store_ppc_memory (addr
, buf
, 4);
490 /* The GPRs are found in the "regs" spufs file. */
491 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_CORE_REGS
))
493 unsigned char buf
[16*SPU_NUM_CORE_REGS
];
497 for (i
= 0; i
< SPU_NUM_CORE_REGS
; i
++)
498 collect_register (i
, buf
+ i
*16);
500 sprintf (annex
, "%d/regs", fd
);
501 spu_proc_xfer_spu (annex
, NULL
, buf
, 0, sizeof buf
);
505 /* Copy LEN bytes from inferior's memory starting at MEMADDR
506 to debugger memory starting at MYADDR. */
508 spu_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
514 /* We must be stopped on a spu_run system call. */
515 if (!parse_spufs_run (&fd
, &addr
))
518 /* Use the "mem" spufs file to access SPU local store. */
519 sprintf (annex
, "%d/mem", fd
);
520 ret
= spu_proc_xfer_spu (annex
, myaddr
, NULL
, memaddr
, len
);
521 return ret
== len
? 0 : EIO
;
524 /* Copy LEN bytes of data from debugger memory at MYADDR
525 to inferior's memory at MEMADDR.
526 On failure (cannot write the inferior)
527 returns the value of errno. */
529 spu_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
535 /* We must be stopped on a spu_run system call. */
536 if (!parse_spufs_run (&fd
, &addr
))
539 /* Use the "mem" spufs file to access SPU local store. */
540 sprintf (annex
, "%d/mem", fd
);
541 ret
= spu_proc_xfer_spu (annex
, NULL
, myaddr
, memaddr
, len
);
542 return ret
== len
? 0 : EIO
;
545 /* Look up special symbols -- unneded here. */
547 spu_look_up_symbols (void)
551 /* Send signal to inferior. */
553 spu_request_interrupt (void)
555 syscall (SYS_tkill
, current_tid
, SIGINT
);
559 spu_arch_string (void)
565 static struct target_ops spu_target_ops
= {
578 spu_request_interrupt
,
590 initialize_low (void)
592 static const unsigned char breakpoint
[] = { 0x00, 0x00, 0x3f, 0xff };
594 set_target_ops (&spu_target_ops
);
595 set_breakpoint_data (breakpoint
, sizeof breakpoint
);