Tests for validate symbol file using build-id.
[gdb/archer.git] / gdb / m68klinux-nat.c
blob11e8f250aa7e5062248136e8613d771fced5e2d7
1 /* Motorola m68k native support for GNU/Linux.
3 Copyright (C) 1996-2013 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "defs.h"
21 #include "frame.h"
22 #include "inferior.h"
23 #include "language.h"
24 #include "gdbcore.h"
25 #include "gdb_string.h"
26 #include "regcache.h"
27 #include "target.h"
28 #include "linux-nat.h"
30 #include "m68k-tdep.h"
32 #include <sys/param.h>
33 #include <sys/dir.h>
34 #include <signal.h>
35 #include <sys/ptrace.h>
36 #include <sys/user.h>
37 #include <sys/ioctl.h>
38 #include <fcntl.h>
39 #include <sys/procfs.h>
41 #ifdef HAVE_SYS_REG_H
42 #include <sys/reg.h>
43 #endif
45 #include <sys/file.h>
46 #include "gdb_stat.h"
48 #include "floatformat.h"
50 #include "target.h"
52 /* Prototypes for supply_gregset etc. */
53 #include "gregset.h"
55 /* Defines ps_err_e, struct ps_prochandle. */
56 #include "gdb_proc_service.h"
58 #ifndef PTRACE_GET_THREAD_AREA
59 #define PTRACE_GET_THREAD_AREA 25
60 #endif
62 /* This table must line up with gdbarch_register_name in "m68k-tdep.c". */
63 static const int regmap[] =
65 PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
66 PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
67 PT_SR, PT_PC,
68 /* PT_FP0, ..., PT_FP7 */
69 21, 24, 27, 30, 33, 36, 39, 42,
70 /* PT_FPCR, PT_FPSR, PT_FPIAR */
71 45, 46, 47
74 /* Which ptrace request retrieves which registers?
75 These apply to the corresponding SET requests as well. */
76 #define NUM_GREGS (18)
77 #define MAX_NUM_REGS (NUM_GREGS + 11)
79 static int
80 getregs_supplies (int regno)
82 return 0 <= regno && regno < NUM_GREGS;
85 static int
86 getfpregs_supplies (int regno)
88 return M68K_FP0_REGNUM <= regno && regno <= M68K_FPI_REGNUM;
91 /* Does the current host support the GETREGS request? */
92 static int have_ptrace_getregs =
93 #ifdef HAVE_PTRACE_GETREGS
95 #else
97 #endif
102 /* Fetching registers directly from the U area, one at a time. */
104 /* Fetch one register. */
106 static void
107 fetch_register (struct regcache *regcache, int regno)
109 struct gdbarch *gdbarch = get_regcache_arch (regcache);
110 long regaddr, val;
111 int i;
112 gdb_byte buf[MAX_REGISTER_SIZE];
113 int tid;
115 /* Overload thread id onto process id. */
116 tid = TIDGET (inferior_ptid);
117 if (tid == 0)
118 tid = PIDGET (inferior_ptid); /* no thread id, just use
119 process id. */
121 regaddr = 4 * regmap[regno];
122 for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
124 errno = 0;
125 val = ptrace (PTRACE_PEEKUSER, tid, regaddr, 0);
126 memcpy (&buf[i], &val, sizeof (long));
127 regaddr += sizeof (long);
128 if (errno != 0)
129 error (_("Couldn't read register %s (#%d): %s."),
130 gdbarch_register_name (gdbarch, regno),
131 regno, safe_strerror (errno));
133 regcache_raw_supply (regcache, regno, buf);
136 /* Fetch register values from the inferior.
137 If REGNO is negative, do this for all registers.
138 Otherwise, REGNO specifies which register (so we can save time). */
140 static void
141 old_fetch_inferior_registers (struct regcache *regcache, int regno)
143 if (regno >= 0)
145 fetch_register (regcache, regno);
147 else
149 for (regno = 0;
150 regno < gdbarch_num_regs (get_regcache_arch (regcache));
151 regno++)
153 fetch_register (regcache, regno);
158 /* Store one register. */
160 static void
161 store_register (const struct regcache *regcache, int regno)
163 struct gdbarch *gdbarch = get_regcache_arch (regcache);
164 long regaddr, val;
165 int i;
166 int tid;
167 gdb_byte buf[MAX_REGISTER_SIZE];
169 /* Overload thread id onto process id. */
170 tid = TIDGET (inferior_ptid);
171 if (tid == 0)
172 tid = PIDGET (inferior_ptid); /* no thread id, just use
173 process id. */
175 regaddr = 4 * regmap[regno];
177 /* Put the contents of regno into a local buffer. */
178 regcache_raw_collect (regcache, regno, buf);
180 /* Store the local buffer into the inferior a chunk at the time. */
181 for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
183 errno = 0;
184 memcpy (&val, &buf[i], sizeof (long));
185 ptrace (PTRACE_POKEUSER, tid, regaddr, val);
186 regaddr += sizeof (long);
187 if (errno != 0)
188 error (_("Couldn't write register %s (#%d): %s."),
189 gdbarch_register_name (gdbarch, regno),
190 regno, safe_strerror (errno));
194 /* Store our register values back into the inferior.
195 If REGNO is negative, do this for all registers.
196 Otherwise, REGNO specifies which register (so we can save time). */
198 static void
199 old_store_inferior_registers (const struct regcache *regcache, int regno)
201 if (regno >= 0)
203 store_register (regcache, regno);
205 else
207 for (regno = 0;
208 regno < gdbarch_num_regs (get_regcache_arch (regcache));
209 regno++)
211 store_register (regcache, regno);
216 /* Given a pointer to a general register set in /proc format
217 (elf_gregset_t *), unpack the register contents and supply
218 them as gdb's idea of the current register values. */
220 void
221 supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
223 struct gdbarch *gdbarch = get_regcache_arch (regcache);
224 const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
225 int regi;
227 for (regi = M68K_D0_REGNUM;
228 regi <= gdbarch_sp_regnum (gdbarch);
229 regi++)
230 regcache_raw_supply (regcache, regi, &regp[regmap[regi]]);
231 regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch),
232 &regp[PT_SR]);
233 regcache_raw_supply (regcache,
234 gdbarch_pc_regnum (gdbarch), &regp[PT_PC]);
237 /* Fill register REGNO (if it is a general-purpose register) in
238 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
239 do this for all registers. */
240 void
241 fill_gregset (const struct regcache *regcache,
242 elf_gregset_t *gregsetp, int regno)
244 elf_greg_t *regp = (elf_greg_t *) gregsetp;
245 int i;
247 for (i = 0; i < NUM_GREGS; i++)
248 if (regno == -1 || regno == i)
249 regcache_raw_collect (regcache, i, regp + regmap[i]);
252 #ifdef HAVE_PTRACE_GETREGS
254 /* Fetch all general-purpose registers from process/thread TID and
255 store their values in GDB's register array. */
257 static void
258 fetch_regs (struct regcache *regcache, int tid)
260 elf_gregset_t regs;
262 if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
264 if (errno == EIO)
266 /* The kernel we're running on doesn't support the GETREGS
267 request. Reset `have_ptrace_getregs'. */
268 have_ptrace_getregs = 0;
269 return;
272 perror_with_name (_("Couldn't get registers"));
275 supply_gregset (regcache, (const elf_gregset_t *) &regs);
278 /* Store all valid general-purpose registers in GDB's register array
279 into the process/thread specified by TID. */
281 static void
282 store_regs (const struct regcache *regcache, int tid, int regno)
284 elf_gregset_t regs;
286 if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
287 perror_with_name (_("Couldn't get registers"));
289 fill_gregset (regcache, &regs, regno);
291 if (ptrace (PTRACE_SETREGS, tid, 0, (int) &regs) < 0)
292 perror_with_name (_("Couldn't write registers"));
295 #else
297 static void fetch_regs (struct regcache *regcache, int tid)
301 static void store_regs (const struct regcache *regcache, int tid, int regno)
305 #endif
308 /* Transfering floating-point registers between GDB, inferiors and cores. */
310 /* What is the address of fpN within the floating-point register set F? */
311 #define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
313 /* Fill GDB's register array with the floating-point register values in
314 *FPREGSETP. */
316 void
317 supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
319 struct gdbarch *gdbarch = get_regcache_arch (regcache);
320 int regi;
322 for (regi = gdbarch_fp0_regnum (gdbarch);
323 regi < gdbarch_fp0_regnum (gdbarch) + 8; regi++)
324 regcache_raw_supply (regcache, regi,
325 FPREG_ADDR (fpregsetp,
326 regi - gdbarch_fp0_regnum (gdbarch)));
327 regcache_raw_supply (regcache, M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]);
328 regcache_raw_supply (regcache, M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]);
329 regcache_raw_supply (regcache, M68K_FPI_REGNUM, &fpregsetp->fpcntl[2]);
332 /* Fill register REGNO (if it is a floating-point register) in
333 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
334 do this for all registers. */
336 void
337 fill_fpregset (const struct regcache *regcache,
338 elf_fpregset_t *fpregsetp, int regno)
340 struct gdbarch *gdbarch = get_regcache_arch (regcache);
341 int i;
343 /* Fill in the floating-point registers. */
344 for (i = gdbarch_fp0_regnum (gdbarch);
345 i < gdbarch_fp0_regnum (gdbarch) + 8; i++)
346 if (regno == -1 || regno == i)
347 regcache_raw_collect (regcache, i,
348 FPREG_ADDR (fpregsetp,
349 i - gdbarch_fp0_regnum (gdbarch)));
351 /* Fill in the floating-point control registers. */
352 for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++)
353 if (regno == -1 || regno == i)
354 regcache_raw_collect (regcache, i,
355 &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]);
358 #ifdef HAVE_PTRACE_GETREGS
360 /* Fetch all floating-point registers from process/thread TID and store
361 thier values in GDB's register array. */
363 static void
364 fetch_fpregs (struct regcache *regcache, int tid)
366 elf_fpregset_t fpregs;
368 if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
369 perror_with_name (_("Couldn't get floating point status"));
371 supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs);
374 /* Store all valid floating-point registers in GDB's register array
375 into the process/thread specified by TID. */
377 static void
378 store_fpregs (const struct regcache *regcache, int tid, int regno)
380 elf_fpregset_t fpregs;
382 if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
383 perror_with_name (_("Couldn't get floating point status"));
385 fill_fpregset (regcache, &fpregs, regno);
387 if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
388 perror_with_name (_("Couldn't write floating point status"));
391 #else
393 static void fetch_fpregs (struct regcache *regcache, int tid)
397 static void store_fpregs (const struct regcache *regcache, int tid, int regno)
401 #endif
403 /* Transferring arbitrary registers between GDB and inferior. */
405 /* Fetch register REGNO from the child process. If REGNO is -1, do
406 this for all registers (including the floating point and SSE
407 registers). */
409 static void
410 m68k_linux_fetch_inferior_registers (struct target_ops *ops,
411 struct regcache *regcache, int regno)
413 int tid;
415 /* Use the old method of peeking around in `struct user' if the
416 GETREGS request isn't available. */
417 if (! have_ptrace_getregs)
419 old_fetch_inferior_registers (regcache, regno);
420 return;
423 /* GNU/Linux LWP ID's are process ID's. */
424 tid = TIDGET (inferior_ptid);
425 if (tid == 0)
426 tid = PIDGET (inferior_ptid); /* Not a threaded program. */
428 /* Use the PTRACE_GETFPXREGS request whenever possible, since it
429 transfers more registers in one system call, and we'll cache the
430 results. But remember that fetch_fpxregs can fail, and return
431 zero. */
432 if (regno == -1)
434 fetch_regs (regcache, tid);
436 /* The call above might reset `have_ptrace_getregs'. */
437 if (! have_ptrace_getregs)
439 old_fetch_inferior_registers (regcache, -1);
440 return;
443 fetch_fpregs (regcache, tid);
444 return;
447 if (getregs_supplies (regno))
449 fetch_regs (regcache, tid);
450 return;
453 if (getfpregs_supplies (regno))
455 fetch_fpregs (regcache, tid);
456 return;
459 internal_error (__FILE__, __LINE__,
460 _("Got request for bad register number %d."), regno);
463 /* Store register REGNO back into the child process. If REGNO is -1,
464 do this for all registers (including the floating point and SSE
465 registers). */
466 static void
467 m68k_linux_store_inferior_registers (struct target_ops *ops,
468 struct regcache *regcache, int regno)
470 int tid;
472 /* Use the old method of poking around in `struct user' if the
473 SETREGS request isn't available. */
474 if (! have_ptrace_getregs)
476 old_store_inferior_registers (regcache, regno);
477 return;
480 /* GNU/Linux LWP ID's are process ID's. */
481 tid = TIDGET (inferior_ptid);
482 if (tid == 0)
483 tid = PIDGET (inferior_ptid); /* Not a threaded program. */
485 /* Use the PTRACE_SETFPREGS requests whenever possible, since it
486 transfers more registers in one system call. But remember that
487 store_fpregs can fail, and return zero. */
488 if (regno == -1)
490 store_regs (regcache, tid, regno);
491 store_fpregs (regcache, tid, regno);
492 return;
495 if (getregs_supplies (regno))
497 store_regs (regcache, tid, regno);
498 return;
501 if (getfpregs_supplies (regno))
503 store_fpregs (regcache, tid, regno);
504 return;
507 internal_error (__FILE__, __LINE__,
508 _("Got request to store bad register number %d."), regno);
511 /* Interpreting register set info found in core files. */
513 /* Provide registers to GDB from a core file.
515 (We can't use the generic version of this function in
516 core-regset.c, because we need to use elf_gregset_t instead of
517 gregset_t.)
519 CORE_REG_SECT points to an array of bytes, which are the contents
520 of a `note' from a core file which BFD thinks might contain
521 register contents. CORE_REG_SIZE is its size.
523 WHICH says which register set corelow suspects this is:
524 0 --- the general-purpose register set, in elf_gregset_t format
525 2 --- the floating-point register set, in elf_fpregset_t format
527 REG_ADDR isn't used on GNU/Linux. */
529 static void
530 fetch_core_registers (struct regcache *regcache,
531 char *core_reg_sect, unsigned core_reg_size,
532 int which, CORE_ADDR reg_addr)
534 elf_gregset_t gregset;
535 elf_fpregset_t fpregset;
537 switch (which)
539 case 0:
540 if (core_reg_size != sizeof (gregset))
541 warning (_("Wrong size gregset in core file."));
542 else
544 memcpy (&gregset, core_reg_sect, sizeof (gregset));
545 supply_gregset (regcache, (const elf_gregset_t *) &gregset);
547 break;
549 case 2:
550 if (core_reg_size != sizeof (fpregset))
551 warning (_("Wrong size fpregset in core file."));
552 else
554 memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
555 supply_fpregset (regcache, (const elf_fpregset_t *) &fpregset);
557 break;
559 default:
560 /* We've covered all the kinds of registers we know about here,
561 so this must be something we wouldn't know what to do with
562 anyway. Just ignore it. */
563 break;
568 /* Fetch the thread-local storage pointer for libthread_db. */
570 ps_err_e
571 ps_get_thread_area (const struct ps_prochandle *ph,
572 lwpid_t lwpid, int idx, void **base)
574 if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) < 0)
575 return PS_ERR;
577 /* IDX is the bias from the thread pointer to the beginning of the
578 thread descriptor. It has to be subtracted due to implementation
579 quirks in libthread_db. */
580 *base = (char *) *base - idx;
582 return PS_OK;
586 /* Register that we are able to handle GNU/Linux ELF core file
587 formats. */
589 static struct core_fns linux_elf_core_fns =
591 bfd_target_elf_flavour, /* core_flavour */
592 default_check_format, /* check_format */
593 default_core_sniffer, /* core_sniffer */
594 fetch_core_registers, /* core_read_registers */
595 NULL /* next */
598 void _initialize_m68k_linux_nat (void);
600 void
601 _initialize_m68k_linux_nat (void)
603 struct target_ops *t;
605 /* Fill in the generic GNU/Linux methods. */
606 t = linux_target ();
608 /* Add our register access methods. */
609 t->to_fetch_registers = m68k_linux_fetch_inferior_registers;
610 t->to_store_registers = m68k_linux_store_inferior_registers;
612 /* Register the target. */
613 linux_nat_add_target (t);
615 deprecated_add_core_fns (&linux_elf_core_fns);