* gdb.texinfo (Monitor commands for gdbserver): New subsection.
[deliverable/binutils-gdb.git] / gdb / gdbserver / spu-low.c
CommitLineData
a13e2c95 1/* Low level interface to SPUs, for the remote server for GDB.
6aba47ca 2 Copyright (C) 2006, 2007 Free Software Foundation, Inc.
a13e2c95
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3
4 Contributed by Ulrich Weigand <uweigand@de.ibm.com>.
5
6 This file is part of GDB.
7
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.
12
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.
17
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. */
22
23#include "server.h"
24
25#include <sys/wait.h>
26#include <stdio.h>
27#include <sys/ptrace.h>
28#include <fcntl.h>
29#include <string.h>
30#include <stdlib.h>
31#include <unistd.h>
32#include <errno.h>
33#include <sys/syscall.h>
34
35/* Some older glibc versions do not define this. */
36#ifndef __WNOTHREAD
37#define __WNOTHREAD 0x20000000 /* Don't wait on children of other
38 threads in this group */
39#endif
40
41#define PTRACE_TYPE_RET long
42#define PTRACE_TYPE_ARG3 long
43
44/* Number of registers. */
45#define SPU_NUM_REGS 130
46#define SPU_NUM_CORE_REGS 128
47
48/* Special registers. */
49#define SPU_ID_REGNUM 128
50#define SPU_PC_REGNUM 129
51
52/* PPU side system calls. */
53#define INSTR_SC 0x44000002
54#define NR_spu_run 0x0116
55
56/* Get current thread ID (Linux task ID). */
57#define current_tid ((struct inferior_list_entry *)current_inferior)->id
58
59/* These are used in remote-utils.c. */
60int using_threads = 0;
a13e2c95
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61
62
63/* Fetch PPU register REGNO. */
64static CORE_ADDR
65fetch_ppc_register (int regno)
66{
67 PTRACE_TYPE_RET res;
68
69 int tid = current_tid;
70
71#ifndef __powerpc64__
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. */
76 {
77 char buf[8];
78
79 errno = 0;
80 ptrace (PPC_PTRACE_PEEKUSR_3264, tid,
81 (PTRACE_TYPE_ARG3) (regno * 8), buf);
82 if (errno == 0)
83 ptrace (PPC_PTRACE_PEEKUSR_3264, tid,
84 (PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4);
85 if (errno == 0)
86 return (CORE_ADDR) *(unsigned long long *)buf;
87 }
88#endif
89
90 errno = 0;
91 res = ptrace (PT_READ_U, tid,
92 (PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0);
93 if (errno != 0)
94 {
95 char mess[128];
96 sprintf (mess, "reading PPC register #%d", regno);
97 perror_with_name (mess);
98 }
99
100 return (CORE_ADDR) (unsigned long) res;
101}
102
103/* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
104static int
105fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word)
106{
107 errno = 0;
108
109#ifndef __powerpc64__
110 if (memaddr >> 32)
111 {
112 unsigned long long addr_8 = (unsigned long long) memaddr;
113 ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);
114 }
115 else
116#endif
117 *word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0);
118
119 return errno;
120}
121
122/* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
123static int
124store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word)
125{
126 errno = 0;
127
128#ifndef __powerpc64__
129 if (memaddr >> 32)
130 {
131 unsigned long long addr_8 = (unsigned long long) memaddr;
132 ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);
133 }
134 else
135#endif
136 ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word);
137
138 return errno;
139}
140
141/* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
142static int
143fetch_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
144{
145 int i, ret;
146
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;
151
152 int tid = current_tid;
153
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)
157 return ret;
158
159 memcpy (myaddr,
160 (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
161 len);
162
163 return 0;
164}
165
166/* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
167static int
168store_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
169{
170 int i, ret;
171
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;
176
177 int tid = current_tid;
178
179 buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET));
180
181 if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET))
182 if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0)
183 return ret;
184
185 if (count > 1)
186 if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1)
187 * sizeof (PTRACE_TYPE_RET),
188 &buffer[count - 1])) != 0)
189 return ret;
190
191 memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
192 myaddr, len);
193
194 for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))
195 if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0)
196 return ret;
197
198 return 0;
199}
200
201
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. */
205static int
206parse_spufs_run (int *fd, CORE_ADDR *addr)
207{
208 char buf[4];
209 CORE_ADDR pc = fetch_ppc_register (32); /* nip */
210
211 /* Fetch instruction preceding current NIP. */
212 if (fetch_ppc_memory (pc-4, buf, 4) != 0)
213 return 0;
214 /* It should be a "sc" instruction. */
215 if (*(unsigned int *)buf != INSTR_SC)
216 return 0;
217 /* System call number should be NR_spu_run. */
218 if (fetch_ppc_register (0) != NR_spu_run)
219 return 0;
220
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);
224 return 1;
225}
226
227
228/* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,
229 using the /proc file system. */
230static int
231spu_proc_xfer_spu (const char *annex, unsigned char *readbuf,
232 const unsigned char *writebuf,
233 CORE_ADDR offset, int len)
234{
235 char buf[128];
236 int fd = 0;
237 int ret = -1;
238
239 if (!annex)
240 return 0;
241
242 sprintf (buf, "/proc/%ld/fd/%s", current_tid, annex);
243 fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
244 if (fd <= 0)
245 return -1;
246
247 if (offset != 0
248 && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
249 {
250 close (fd);
251 return -1;
252 }
253
254 if (writebuf)
255 ret = write (fd, writebuf, (size_t) len);
256 else if (readbuf)
257 ret = read (fd, readbuf, (size_t) len);
258
259 close (fd);
260 return ret;
261}
262
263
264/* Start an inferior process and returns its pid.
265 ALLARGS is a vector of program-name and args. */
266static int
267spu_create_inferior (char *program, char **allargs)
268{
269 int pid;
270
271 pid = fork ();
272 if (pid < 0)
273 perror_with_name ("fork");
274
275 if (pid == 0)
276 {
277 ptrace (PTRACE_TRACEME, 0, 0, 0);
278
279 setpgid (0, 0);
280
281 execv (program, allargs);
282
283 fprintf (stderr, "Cannot exec %s: %s.\n", program,
284 strerror (errno));
285 fflush (stderr);
286 _exit (0177);
287 }
288
289 add_thread (pid, NULL, pid);
290 return pid;
291}
292
293/* Attach to an inferior process. */
294int
295spu_attach (unsigned long pid)
296{
297 if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
298 {
299 fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid,
300 strerror (errno), errno);
301 fflush (stderr);
302 _exit (0177);
303 }
304
305 add_thread (pid, NULL, pid);
306 return 0;
307}
308
309/* Kill the inferior process. */
310static void
311spu_kill (void)
312{
313 ptrace (PTRACE_KILL, current_tid, 0, 0);
314}
315
316/* Detach from inferior process. */
317static void
318spu_detach (void)
319{
320 ptrace (PTRACE_DETACH, current_tid, 0, 0);
321}
322
323/* Return nonzero if the given thread is still alive. */
324static int
325spu_thread_alive (unsigned long tid)
326{
327 return tid == current_tid;
328}
329
330/* Resume process. */
331static void
332spu_resume (struct thread_resume *resume_info)
333{
334 while (resume_info->thread != -1
335 && resume_info->thread != current_tid)
336 resume_info++;
337
338 block_async_io ();
339 enable_async_io ();
340
341 if (resume_info->leave_stopped)
342 return;
343
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");
348
349 regcache_invalidate ();
350
351 errno = 0;
352 ptrace (PTRACE_CONT, current_tid, 0, resume_info->sig);
353 if (errno)
354 perror_with_name ("ptrace");
355}
356
357/* Wait for process, returns status. */
358static unsigned char
359spu_wait (char *status)
360{
361 int tid = current_tid;
362 int w;
363 int ret;
364
365 enable_async_io ();
366 unblock_async_io ();
367
368 while (1)
369 {
370 ret = waitpid (tid, &w, WNOHANG | __WALL | __WNOTHREAD);
371
372 if (ret == -1)
373 {
374 if (errno != ECHILD)
375 perror_with_name ("waitpid");
376 }
377 else if (ret > 0)
378 break;
379
380 usleep (1000);
381 }
382
383 /* On the first wait, continue running the inferior until we are
384 blocked inside an spu_run system call. */
385 if (!server_waiting)
386 {
387 int fd;
388 CORE_ADDR addr;
389
390 while (!parse_spufs_run (&fd, &addr))
391 {
392 ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0);
393 waitpid (tid, NULL, __WALL | __WNOTHREAD);
394 }
395 }
396
397 disable_async_io ();
398
399 if (WIFEXITED (w))
400 {
401 fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
402 *status = 'W';
403 clear_inferiors ();
404 return ((unsigned char) WEXITSTATUS (w));
405 }
406 else if (!WIFSTOPPED (w))
407 {
408 fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
409 *status = 'X';
410 clear_inferiors ();
411 return ((unsigned char) WTERMSIG (w));
412 }
413
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 ... */
416 if (!server_waiting)
417 {
418 *status = 'T';
419 return 0;
420 }
421
422 *status = 'T';
423 return ((unsigned char) WSTOPSIG (w));
424}
425
426/* Fetch inferior registers. */
427static void
428spu_fetch_registers (int regno)
429{
430 int fd;
431 CORE_ADDR addr;
432
433 /* ??? Some callers use 0 to mean all registers. */
434 if (regno == 0)
435 regno = -1;
436
437 /* We must be stopped on a spu_run system call. */
438 if (!parse_spufs_run (&fd, &addr))
439 return;
440
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);
444
445 /* The NPC register is found at ADDR. */
446 if (regno == -1 || regno == SPU_PC_REGNUM)
447 {
448 char buf[4];
449 if (fetch_ppc_memory (addr, buf, 4) == 0)
450 supply_register (SPU_PC_REGNUM, buf);
451 }
452
453 /* The GPRs are found in the "regs" spufs file. */
454 if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS))
455 {
456 unsigned char buf[16*SPU_NUM_CORE_REGS];
457 char annex[32];
458 int i;
459
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);
464 }
465}
466
467/* Store inferior registers. */
468static void
469spu_store_registers (int regno)
470{
471 int fd;
472 CORE_ADDR addr;
473
474 /* ??? Some callers use 0 to mean all registers. */
475 if (regno == 0)
476 regno = -1;
477
478 /* We must be stopped on a spu_run system call. */
479 if (!parse_spufs_run (&fd, &addr))
480 return;
481
482 /* The NPC register is found at ADDR. */
483 if (regno == -1 || regno == SPU_PC_REGNUM)
484 {
485 char buf[4];
486 collect_register (SPU_PC_REGNUM, buf);
487 store_ppc_memory (addr, buf, 4);
488 }
489
490 /* The GPRs are found in the "regs" spufs file. */
491 if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS))
492 {
493 unsigned char buf[16*SPU_NUM_CORE_REGS];
494 char annex[32];
495 int i;
496
497 for (i = 0; i < SPU_NUM_CORE_REGS; i++)
498 collect_register (i, buf + i*16);
499
500 sprintf (annex, "%d/regs", fd);
501 spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf);
502 }
503}
504
505/* Copy LEN bytes from inferior's memory starting at MEMADDR
506 to debugger memory starting at MYADDR. */
507static int
508spu_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
509{
510 int fd, ret;
511 CORE_ADDR addr;
512 char annex[32];
513
514 /* We must be stopped on a spu_run system call. */
515 if (!parse_spufs_run (&fd, &addr))
516 return 0;
517
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;
522}
523
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. */
528static int
529spu_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
530{
531 int fd, ret;
532 CORE_ADDR addr;
533 char annex[32];
534
535 /* We must be stopped on a spu_run system call. */
536 if (!parse_spufs_run (&fd, &addr))
537 return 0;
538
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;
543}
544
545/* Look up special symbols -- unneded here. */
546static void
547spu_look_up_symbols (void)
548{
549}
550
551/* Send signal to inferior. */
552static void
ef57601b 553spu_request_interrupt (void)
a13e2c95 554{
ef57601b 555 syscall (SYS_tkill, current_tid, SIGINT);
a13e2c95
UW
556}
557
ab39bf24
UW
558static const char *
559spu_arch_string (void)
560{
561 return "spu";
562}
563
a13e2c95
UW
564\f
565static struct target_ops spu_target_ops = {
566 spu_create_inferior,
567 spu_attach,
568 spu_kill,
569 spu_detach,
570 spu_thread_alive,
571 spu_resume,
572 spu_wait,
573 spu_fetch_registers,
574 spu_store_registers,
575 spu_read_memory,
576 spu_write_memory,
577 spu_look_up_symbols,
ef57601b 578 spu_request_interrupt,
a13e2c95 579 NULL,
ab39bf24
UW
580 NULL,
581 NULL,
582 NULL,
583 NULL,
584 NULL,
585 NULL,
586 spu_arch_string,
a13e2c95
UW
587};
588
589void
590initialize_low (void)
591{
592 static const unsigned char breakpoint[] = { 0x00, 0x00, 0x3f, 0xff };
593
594 set_target_ops (&spu_target_ops);
595 set_breakpoint_data (breakpoint, sizeof breakpoint);
596 init_registers ();
597}
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