1 /* Low level interface to SPUs, for the remote server for GDB.
2 Copyright (C) 2006-2016 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/>. */
24 #include <sys/ptrace.h>
27 #include <sys/syscall.h>
28 #include "filestuff.h"
31 /* Some older glibc versions do not define this. */
33 #define __WNOTHREAD 0x20000000 /* Don't wait on children of other
34 threads in this group */
37 #define PTRACE_TYPE_RET long
38 #define PTRACE_TYPE_ARG3 long
40 /* Number of registers. */
41 #define SPU_NUM_REGS 130
42 #define SPU_NUM_CORE_REGS 128
44 /* Special registers. */
45 #define SPU_ID_REGNUM 128
46 #define SPU_PC_REGNUM 129
48 /* PPU side system calls. */
49 #define INSTR_SC 0x44000002
50 #define NR_spu_run 0x0116
52 /* These are used in remote-utils.c. */
53 int using_threads
= 0;
55 /* Defined in auto-generated file reg-spu.c. */
56 void init_registers_spu (void);
57 extern const struct target_desc
*tdesc_spu
;
59 /* Software breakpoint instruction. */
60 static const gdb_byte breakpoint
[] = { 0x00, 0x00, 0x3f, 0xff };
62 /* Fetch PPU register REGNO. */
64 fetch_ppc_register (int regno
)
68 int tid
= ptid_get_lwp (current_ptid
);
71 /* If running as a 32-bit process on a 64-bit system, we attempt
72 to get the full 64-bit register content of the target process.
73 If the PPC special ptrace call fails, we're on a 32-bit system;
74 just fall through to the regular ptrace call in that case. */
79 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
80 (PTRACE_TYPE_ARG3
) (regno
* 8), buf
);
82 ptrace (PPC_PTRACE_PEEKUSR_3264
, tid
,
83 (PTRACE_TYPE_ARG3
) (regno
* 8 + 4), buf
+ 4);
85 return (CORE_ADDR
) *(unsigned long long *)buf
;
90 res
= ptrace (PT_READ_U
, tid
,
91 (PTRACE_TYPE_ARG3
) (regno
* sizeof (PTRACE_TYPE_RET
)), 0);
95 sprintf (mess
, "reading PPC register #%d", regno
);
96 perror_with_name (mess
);
99 return (CORE_ADDR
) (unsigned long) res
;
102 /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
104 fetch_ppc_memory_1 (int tid
, CORE_ADDR memaddr
, PTRACE_TYPE_RET
*word
)
108 #ifndef __powerpc64__
111 unsigned long long addr_8
= (unsigned long long) memaddr
;
112 ptrace (PPC_PTRACE_PEEKTEXT_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
116 *word
= ptrace (PT_READ_I
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, 0);
121 /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
123 store_ppc_memory_1 (int tid
, CORE_ADDR memaddr
, PTRACE_TYPE_RET word
)
127 #ifndef __powerpc64__
130 unsigned long long addr_8
= (unsigned long long) memaddr
;
131 ptrace (PPC_PTRACE_POKEDATA_3264
, tid
, (PTRACE_TYPE_ARG3
) &addr_8
, word
);
135 ptrace (PT_WRITE_D
, tid
, (PTRACE_TYPE_ARG3
) (size_t) memaddr
, word
);
140 /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
142 fetch_ppc_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
146 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_TYPE_RET
);
147 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
148 / sizeof (PTRACE_TYPE_RET
));
149 PTRACE_TYPE_RET
*buffer
;
151 int tid
= ptid_get_lwp (current_ptid
);
153 buffer
= XALLOCAVEC (PTRACE_TYPE_RET
, count
);
154 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
155 if ((ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[i
])) != 0)
159 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
165 /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
167 store_ppc_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
171 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_TYPE_RET
);
172 int count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_TYPE_RET
) - 1)
173 / sizeof (PTRACE_TYPE_RET
));
174 PTRACE_TYPE_RET
*buffer
;
176 int tid
= ptid_get_lwp (current_ptid
);
178 buffer
= XALLOCAVEC (PTRACE_TYPE_RET
, count
);
180 if (addr
!= memaddr
|| len
< (int) sizeof (PTRACE_TYPE_RET
))
181 if ((ret
= fetch_ppc_memory_1 (tid
, addr
, &buffer
[0])) != 0)
185 if ((ret
= fetch_ppc_memory_1 (tid
, addr
+ (count
- 1)
186 * sizeof (PTRACE_TYPE_RET
),
187 &buffer
[count
- 1])) != 0)
190 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_TYPE_RET
) - 1)),
193 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_TYPE_RET
))
194 if ((ret
= store_ppc_memory_1 (tid
, addr
, buffer
[i
])) != 0)
201 /* If the PPU thread is currently stopped on a spu_run system call,
202 return to FD and ADDR the file handle and NPC parameter address
203 used with the system call. Return non-zero if successful. */
205 parse_spufs_run (int *fd
, CORE_ADDR
*addr
)
208 CORE_ADDR pc
= fetch_ppc_register (32); /* nip */
210 /* Fetch instruction preceding current NIP. */
211 if (fetch_ppc_memory (pc
-4, (char *) &insn
, 4) != 0)
213 /* It should be a "sc" instruction. */
214 if (insn
!= INSTR_SC
)
216 /* System call number should be NR_spu_run. */
217 if (fetch_ppc_register (0) != NR_spu_run
)
220 /* Register 3 contains fd, register 4 the NPC param pointer. */
221 *fd
= fetch_ppc_register (34); /* orig_gpr3 */
222 *addr
= fetch_ppc_register (4);
227 /* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,
228 using the /proc file system. */
230 spu_proc_xfer_spu (const char *annex
, unsigned char *readbuf
,
231 const unsigned char *writebuf
,
232 CORE_ADDR offset
, int len
)
241 sprintf (buf
, "/proc/%ld/fd/%s", ptid_get_lwp (current_ptid
), annex
);
242 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
247 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
254 ret
= write (fd
, writebuf
, (size_t) len
);
256 ret
= read (fd
, readbuf
, (size_t) len
);
263 /* Start an inferior process and returns its pid.
264 ALLARGS is a vector of program-name and args. */
266 spu_create_inferior (char *program
, char **allargs
)
270 struct process_info
*proc
;
274 perror_with_name ("fork");
279 ptrace (PTRACE_TRACEME
, 0, 0, 0);
283 execv (program
, allargs
);
285 execvp (program
, allargs
);
287 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
293 proc
= add_process (pid
, 0);
294 proc
->tdesc
= tdesc_spu
;
296 ptid
= ptid_build (pid
, pid
, 0);
297 add_thread (ptid
, NULL
);
301 /* Attach to an inferior process. */
303 spu_attach (unsigned long pid
)
306 struct process_info
*proc
;
308 if (ptrace (PTRACE_ATTACH
, pid
, 0, 0) != 0)
310 fprintf (stderr
, "Cannot attach to process %ld: %s (%d)\n", pid
,
311 strerror (errno
), errno
);
316 proc
= add_process (pid
, 1);
317 proc
->tdesc
= tdesc_spu
;
318 ptid
= ptid_build (pid
, pid
, 0);
319 add_thread (ptid
, NULL
);
323 /* Kill the inferior process. */
328 struct process_info
*process
= find_process_pid (pid
);
332 ptrace (PTRACE_KILL
, pid
, 0, 0);
335 ret
= waitpid (pid
, &status
, 0);
336 if (WIFEXITED (status
) || WIFSIGNALED (status
))
338 } while (ret
!= -1 || errno
!= ECHILD
);
341 remove_process (process
);
345 /* Detach from inferior process. */
349 struct process_info
*process
= find_process_pid (pid
);
353 ptrace (PTRACE_DETACH
, pid
, 0, 0);
356 remove_process (process
);
361 spu_mourn (struct process_info
*process
)
363 remove_process (process
);
372 ret
= waitpid (pid
, &status
, 0);
373 if (WIFEXITED (status
) || WIFSIGNALED (status
))
375 } while (ret
!= -1 || errno
!= ECHILD
);
378 /* Return nonzero if the given thread is still alive. */
380 spu_thread_alive (ptid_t ptid
)
382 return ptid_equal (ptid
, current_ptid
);
385 /* Resume process. */
387 spu_resume (struct thread_resume
*resume_info
, size_t n
)
389 struct thread_info
*thr
= get_first_thread ();
392 for (i
= 0; i
< n
; i
++)
393 if (ptid_equal (resume_info
[i
].thread
, minus_one_ptid
)
394 || ptid_equal (resume_info
[i
].thread
, ptid_of (thr
)))
400 /* We don't support hardware single-stepping right now, assume
401 GDB knows to use software single-stepping. */
402 if (resume_info
[i
].kind
== resume_step
)
403 fprintf (stderr
, "Hardware single-step not supported.\n");
405 regcache_invalidate ();
408 ptrace (PTRACE_CONT
, ptid_get_lwp (ptid_of (thr
)), 0, resume_info
[i
].sig
);
410 perror_with_name ("ptrace");
413 /* Wait for process, returns status. */
415 spu_wait (ptid_t ptid
, struct target_waitstatus
*ourstatus
, int options
)
417 int pid
= ptid_get_pid (ptid
);
423 ret
= waitpid (pid
, &w
, WNOHANG
| __WALL
| __WNOTHREAD
);
428 perror_with_name ("waitpid");
436 /* On the first wait, continue running the inferior until we are
437 blocked inside an spu_run system call. */
443 while (!parse_spufs_run (&fd
, &addr
))
445 ptrace (PT_SYSCALL
, pid
, (PTRACE_TYPE_ARG3
) 0, 0);
446 waitpid (pid
, NULL
, __WALL
| __WNOTHREAD
);
452 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
453 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
454 ourstatus
->value
.integer
= WEXITSTATUS (w
);
456 return pid_to_ptid (ret
);
458 else if (!WIFSTOPPED (w
))
460 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
461 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
462 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
464 return pid_to_ptid (ret
);
467 /* After attach, we may have received a SIGSTOP. Do not return this
468 as signal to GDB, or else it will try to continue with SIGSTOP ... */
471 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
472 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
473 return ptid_build (ret
, ret
, 0);
476 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
477 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
478 return ptid_build (ret
, ret
, 0);
481 /* Fetch inferior registers. */
483 spu_fetch_registers (struct regcache
*regcache
, int regno
)
488 /* We must be stopped on a spu_run system call. */
489 if (!parse_spufs_run (&fd
, &addr
))
492 /* The ID register holds the spufs file handle. */
493 if (regno
== -1 || regno
== SPU_ID_REGNUM
)
494 supply_register (regcache
, SPU_ID_REGNUM
, (char *)&fd
);
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 supply_register (regcache
, SPU_PC_REGNUM
, buf
);
504 /* The GPRs are found in the "regs" spufs file. */
505 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_CORE_REGS
))
507 unsigned char buf
[16*SPU_NUM_CORE_REGS
];
511 sprintf (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_CORE_REGS
; i
++)
514 supply_register (regcache
, i
, buf
+ i
*16);
518 /* Store inferior registers. */
520 spu_store_registers (struct regcache
*regcache
, int regno
)
525 /* ??? Some callers use 0 to mean all registers. */
529 /* We must be stopped on a spu_run system call. */
530 if (!parse_spufs_run (&fd
, &addr
))
533 /* The NPC register is found at ADDR. */
534 if (regno
== -1 || regno
== SPU_PC_REGNUM
)
537 collect_register (regcache
, SPU_PC_REGNUM
, buf
);
538 store_ppc_memory (addr
, buf
, 4);
541 /* The GPRs are found in the "regs" spufs file. */
542 if (regno
== -1 || (regno
>= 0 && regno
< SPU_NUM_CORE_REGS
))
544 unsigned char buf
[16*SPU_NUM_CORE_REGS
];
548 for (i
= 0; i
< SPU_NUM_CORE_REGS
; i
++)
549 collect_register (regcache
, i
, buf
+ i
*16);
551 sprintf (annex
, "%d/regs", fd
);
552 spu_proc_xfer_spu (annex
, NULL
, buf
, 0, sizeof buf
);
556 /* Copy LEN bytes from inferior's memory starting at MEMADDR
557 to debugger memory starting at MYADDR. */
559 spu_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
563 char annex
[32], lslr_annex
[32], buf
[32];
566 /* We must be stopped on a spu_run system call. */
567 if (!parse_spufs_run (&fd
, &addr
))
570 /* Use the "mem" spufs file to access SPU local store. */
571 sprintf (annex
, "%d/mem", fd
);
572 ret
= spu_proc_xfer_spu (annex
, myaddr
, NULL
, memaddr
, len
);
574 return ret
== len
? 0 : EIO
;
576 /* SPU local store access wraps the address around at the
577 local store limit. We emulate this here. To avoid needing
578 an extra access to retrieve the LSLR, we only do that after
579 trying the original address first, and getting end-of-file. */
580 sprintf (lslr_annex
, "%d/lslr", fd
);
581 memset (buf
, 0, sizeof buf
);
582 if (spu_proc_xfer_spu (lslr_annex
, (unsigned char *)buf
, NULL
,
586 lslr
= strtoul (buf
, NULL
, 16);
587 ret
= spu_proc_xfer_spu (annex
, myaddr
, NULL
, memaddr
& lslr
, len
);
589 return ret
== len
? 0 : EIO
;
592 /* Copy LEN bytes of data from debugger memory at MYADDR
593 to inferior's memory at MEMADDR.
594 On failure (cannot write the inferior)
595 returns the value of errno. */
597 spu_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
601 char annex
[32], lslr_annex
[32], buf
[32];
604 /* We must be stopped on a spu_run system call. */
605 if (!parse_spufs_run (&fd
, &addr
))
608 /* Use the "mem" spufs file to access SPU local store. */
609 sprintf (annex
, "%d/mem", fd
);
610 ret
= spu_proc_xfer_spu (annex
, NULL
, myaddr
, memaddr
, len
);
612 return ret
== len
? 0 : EIO
;
614 /* SPU local store access wraps the address around at the
615 local store limit. We emulate this here. To avoid needing
616 an extra access to retrieve the LSLR, we only do that after
617 trying the original address first, and getting end-of-file. */
618 sprintf (lslr_annex
, "%d/lslr", fd
);
619 memset (buf
, 0, sizeof buf
);
620 if (spu_proc_xfer_spu (lslr_annex
, (unsigned char *)buf
, NULL
,
624 lslr
= strtoul (buf
, NULL
, 16);
625 ret
= spu_proc_xfer_spu (annex
, NULL
, myaddr
, memaddr
& lslr
, len
);
627 return ret
== len
? 0 : EIO
;
630 /* Look up special symbols -- unneded here. */
632 spu_look_up_symbols (void)
636 /* Send signal to inferior. */
638 spu_request_interrupt (void)
640 struct thread_info
*thr
= get_first_thread ();
642 syscall (SYS_tkill
, lwpid_of (thr
), SIGINT
);
645 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
647 static const gdb_byte
*
648 spu_sw_breakpoint_from_kind (int kind
, int *size
)
650 *size
= sizeof breakpoint
;
654 static struct target_ops spu_target_ops
= {
656 NULL
, /* post_create_inferior */
667 NULL
, /* prepare_to_access_memory */
668 NULL
, /* done_accessing_memory */
672 spu_request_interrupt
,
674 NULL
, /* supports_z_point_type */
677 NULL
, /* stopped_by_sw_breakpoint */
678 NULL
, /* supports_stopped_by_sw_breakpoint */
679 NULL
, /* stopped_by_hw_breakpoint */
680 NULL
, /* supports_stopped_by_hw_breakpoint */
681 NULL
, /* supports_hardware_single_step */
687 hostio_last_error_from_errno
,
688 NULL
, /* qxfer_osdata */
689 NULL
, /* qxfer_siginfo */
690 NULL
, /* supports_non_stop */
692 NULL
, /* start_non_stop */
693 NULL
, /* supports_multi_process */
694 NULL
, /* supports_fork_events */
695 NULL
, /* supports_vfork_events */
696 NULL
, /* supports_exec_events */
697 NULL
, /* handle_new_gdb_connection */
698 NULL
, /* handle_monitor_command */
699 NULL
, /* core_of_thread */
700 NULL
, /* read_loadmap */
701 NULL
, /* process_qsupported */
702 NULL
, /* supports_tracepoints */
705 NULL
, /* thread_stopped */
706 NULL
, /* get_tib_address */
707 NULL
, /* pause_all */
708 NULL
, /* unpause_all */
709 NULL
, /* stabilize_threads */
710 NULL
, /* install_fast_tracepoint_jump_pad */
712 NULL
, /* supports_disable_randomization */
713 NULL
, /* get_min_fast_tracepoint_insn_len */
714 NULL
, /* qxfer_libraries_svr4 */
715 NULL
, /* support_agent */
716 NULL
, /* support_btrace */
717 NULL
, /* enable_btrace */
718 NULL
, /* disable_btrace */
719 NULL
, /* read_btrace */
720 NULL
, /* read_btrace_conf */
721 NULL
, /* supports_range_stepping */
722 NULL
, /* pid_to_exec_file */
723 NULL
, /* multifs_open */
724 NULL
, /* multifs_unlink */
725 NULL
, /* multifs_readlink */
726 NULL
, /* breakpoint_kind_from_pc */
727 spu_sw_breakpoint_from_kind
,
731 initialize_low (void)
733 set_target_ops (&spu_target_ops
);
734 init_registers_spu ();