1 /* Motorola m68k native support for GNU/Linux.
3 Copyright (C) 1996, 1998, 2000-2012 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/>. */
25 #include "gdb_string.h"
28 #include "linux-nat.h"
30 #include "m68k-tdep.h"
32 #include <sys/param.h>
35 #include <sys/ptrace.h>
37 #include <sys/ioctl.h>
39 #include <sys/procfs.h>
48 #include "floatformat.h"
52 /* Prototypes for supply_gregset etc. */
55 /* This table must line up with gdbarch_register_name in "m68k-tdep.c". */
56 static const int regmap
[] =
58 PT_D0
, PT_D1
, PT_D2
, PT_D3
, PT_D4
, PT_D5
, PT_D6
, PT_D7
,
59 PT_A0
, PT_A1
, PT_A2
, PT_A3
, PT_A4
, PT_A5
, PT_A6
, PT_USP
,
61 /* PT_FP0, ..., PT_FP7 */
62 21, 24, 27, 30, 33, 36, 39, 42,
63 /* PT_FPCR, PT_FPSR, PT_FPIAR */
67 /* Which ptrace request retrieves which registers?
68 These apply to the corresponding SET requests as well. */
69 #define NUM_GREGS (18)
70 #define MAX_NUM_REGS (NUM_GREGS + 11)
73 getregs_supplies (int regno
)
75 return 0 <= regno
&& regno
< NUM_GREGS
;
79 getfpregs_supplies (int regno
)
81 return M68K_FP0_REGNUM
<= regno
&& regno
<= M68K_FPI_REGNUM
;
84 /* Does the current host support the GETREGS request? */
85 int have_ptrace_getregs
=
86 #ifdef HAVE_PTRACE_GETREGS
95 /* Fetching registers directly from the U area, one at a time. */
97 /* Fetch one register. */
100 fetch_register (struct regcache
*regcache
, int regno
)
102 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
105 char buf
[MAX_REGISTER_SIZE
];
108 /* Overload thread id onto process id. */
109 tid
= TIDGET (inferior_ptid
);
111 tid
= PIDGET (inferior_ptid
); /* no thread id, just use
114 regaddr
= 4 * regmap
[regno
];
115 for (i
= 0; i
< register_size (gdbarch
, regno
); i
+= sizeof (long))
118 *(long *) &buf
[i
] = ptrace (PTRACE_PEEKUSER
, tid
, regaddr
, 0);
119 regaddr
+= sizeof (long);
121 error (_("Couldn't read register %s (#%d): %s."),
122 gdbarch_register_name (gdbarch
, regno
),
123 regno
, safe_strerror (errno
));
125 regcache_raw_supply (regcache
, regno
, buf
);
128 /* Fetch register values from the inferior.
129 If REGNO is negative, do this for all registers.
130 Otherwise, REGNO specifies which register (so we can save time). */
133 old_fetch_inferior_registers (struct regcache
*regcache
, int regno
)
137 fetch_register (regcache
, regno
);
142 regno
< gdbarch_num_regs (get_regcache_arch (regcache
));
145 fetch_register (regcache
, regno
);
150 /* Store one register. */
153 store_register (const struct regcache
*regcache
, int regno
)
155 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
159 char buf
[MAX_REGISTER_SIZE
];
161 /* Overload thread id onto process id. */
162 tid
= TIDGET (inferior_ptid
);
164 tid
= PIDGET (inferior_ptid
); /* no thread id, just use
167 regaddr
= 4 * regmap
[regno
];
169 /* Put the contents of regno into a local buffer. */
170 regcache_raw_collect (regcache
, regno
, buf
);
172 /* Store the local buffer into the inferior a chunk at the time. */
173 for (i
= 0; i
< register_size (gdbarch
, regno
); i
+= sizeof (long))
176 ptrace (PTRACE_POKEUSER
, tid
, regaddr
, *(long *) &buf
[i
]);
177 regaddr
+= sizeof (long);
179 error (_("Couldn't write register %s (#%d): %s."),
180 gdbarch_register_name (gdbarch
, regno
),
181 regno
, safe_strerror (errno
));
185 /* Store our register values back into the inferior.
186 If REGNO is negative, do this for all registers.
187 Otherwise, REGNO specifies which register (so we can save time). */
190 old_store_inferior_registers (const struct regcache
*regcache
, int regno
)
194 store_register (regcache
, regno
);
199 regno
< gdbarch_num_regs (get_regcache_arch (regcache
));
202 store_register (regcache
, regno
);
207 /* Given a pointer to a general register set in /proc format
208 (elf_gregset_t *), unpack the register contents and supply
209 them as gdb's idea of the current register values. */
212 supply_gregset (struct regcache
*regcache
, const elf_gregset_t
*gregsetp
)
214 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
215 const elf_greg_t
*regp
= (const elf_greg_t
*) gregsetp
;
218 for (regi
= M68K_D0_REGNUM
;
219 regi
<= gdbarch_sp_regnum (gdbarch
);
221 regcache_raw_supply (regcache
, regi
, ®p
[regmap
[regi
]]);
222 regcache_raw_supply (regcache
, gdbarch_ps_regnum (gdbarch
),
224 regcache_raw_supply (regcache
,
225 gdbarch_pc_regnum (gdbarch
), ®p
[PT_PC
]);
228 /* Fill register REGNO (if it is a general-purpose register) in
229 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
230 do this for all registers. */
232 fill_gregset (const struct regcache
*regcache
,
233 elf_gregset_t
*gregsetp
, int regno
)
235 elf_greg_t
*regp
= (elf_greg_t
*) gregsetp
;
238 for (i
= 0; i
< NUM_GREGS
; i
++)
239 if (regno
== -1 || regno
== i
)
240 regcache_raw_collect (regcache
, i
, regp
+ regmap
[i
]);
243 #ifdef HAVE_PTRACE_GETREGS
245 /* Fetch all general-purpose registers from process/thread TID and
246 store their values in GDB's register array. */
249 fetch_regs (struct regcache
*regcache
, int tid
)
253 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
257 /* The kernel we're running on doesn't support the GETREGS
258 request. Reset `have_ptrace_getregs'. */
259 have_ptrace_getregs
= 0;
263 perror_with_name (_("Couldn't get registers"));
266 supply_gregset (regcache
, (const elf_gregset_t
*) ®s
);
269 /* Store all valid general-purpose registers in GDB's register array
270 into the process/thread specified by TID. */
273 store_regs (const struct regcache
*regcache
, int tid
, int regno
)
277 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
278 perror_with_name (_("Couldn't get registers"));
280 fill_gregset (regcache
, ®s
, regno
);
282 if (ptrace (PTRACE_SETREGS
, tid
, 0, (int) ®s
) < 0)
283 perror_with_name (_("Couldn't write registers"));
288 static void fetch_regs (struct regcache
*regcache
, int tid
)
292 static void store_regs (const struct regcache
*regcache
, int tid
, int regno
)
299 /* Transfering floating-point registers between GDB, inferiors and cores. */
301 /* What is the address of fpN within the floating-point register set F? */
302 #define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
304 /* Fill GDB's register array with the floating-point register values in
308 supply_fpregset (struct regcache
*regcache
, const elf_fpregset_t
*fpregsetp
)
310 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
313 for (regi
= gdbarch_fp0_regnum (gdbarch
);
314 regi
< gdbarch_fp0_regnum (gdbarch
) + 8; regi
++)
315 regcache_raw_supply (regcache
, regi
,
316 FPREG_ADDR (fpregsetp
,
317 regi
- gdbarch_fp0_regnum (gdbarch
)));
318 regcache_raw_supply (regcache
, M68K_FPC_REGNUM
, &fpregsetp
->fpcntl
[0]);
319 regcache_raw_supply (regcache
, M68K_FPS_REGNUM
, &fpregsetp
->fpcntl
[1]);
320 regcache_raw_supply (regcache
, M68K_FPI_REGNUM
, &fpregsetp
->fpcntl
[2]);
323 /* Fill register REGNO (if it is a floating-point register) in
324 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
325 do this for all registers. */
328 fill_fpregset (const struct regcache
*regcache
,
329 elf_fpregset_t
*fpregsetp
, int regno
)
331 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
334 /* Fill in the floating-point registers. */
335 for (i
= gdbarch_fp0_regnum (gdbarch
);
336 i
< gdbarch_fp0_regnum (gdbarch
) + 8; i
++)
337 if (regno
== -1 || regno
== i
)
338 regcache_raw_collect (regcache
, i
,
339 FPREG_ADDR (fpregsetp
,
340 i
- gdbarch_fp0_regnum (gdbarch
)));
342 /* Fill in the floating-point control registers. */
343 for (i
= M68K_FPC_REGNUM
; i
<= M68K_FPI_REGNUM
; i
++)
344 if (regno
== -1 || regno
== i
)
345 regcache_raw_collect (regcache
, i
,
346 &fpregsetp
->fpcntl
[i
- M68K_FPC_REGNUM
]);
349 #ifdef HAVE_PTRACE_GETREGS
351 /* Fetch all floating-point registers from process/thread TID and store
352 thier values in GDB's register array. */
355 fetch_fpregs (struct regcache
*regcache
, int tid
)
357 elf_fpregset_t fpregs
;
359 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
360 perror_with_name (_("Couldn't get floating point status"));
362 supply_fpregset (regcache
, (const elf_fpregset_t
*) &fpregs
);
365 /* Store all valid floating-point registers in GDB's register array
366 into the process/thread specified by TID. */
369 store_fpregs (const struct regcache
*regcache
, int tid
, int regno
)
371 elf_fpregset_t fpregs
;
373 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
374 perror_with_name (_("Couldn't get floating point status"));
376 fill_fpregset (regcache
, &fpregs
, regno
);
378 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
379 perror_with_name (_("Couldn't write floating point status"));
384 static void fetch_fpregs (struct regcache
*regcache
, int tid
)
388 static void store_fpregs (const struct regcache
*regcache
, int tid
, int regno
)
394 /* Transferring arbitrary registers between GDB and inferior. */
396 /* Fetch register REGNO from the child process. If REGNO is -1, do
397 this for all registers (including the floating point and SSE
401 m68k_linux_fetch_inferior_registers (struct target_ops
*ops
,
402 struct regcache
*regcache
, int regno
)
406 /* Use the old method of peeking around in `struct user' if the
407 GETREGS request isn't available. */
408 if (! have_ptrace_getregs
)
410 old_fetch_inferior_registers (regcache
, regno
);
414 /* GNU/Linux LWP ID's are process ID's. */
415 tid
= TIDGET (inferior_ptid
);
417 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
419 /* Use the PTRACE_GETFPXREGS request whenever possible, since it
420 transfers more registers in one system call, and we'll cache the
421 results. But remember that fetch_fpxregs can fail, and return
425 fetch_regs (regcache
, tid
);
427 /* The call above might reset `have_ptrace_getregs'. */
428 if (! have_ptrace_getregs
)
430 old_fetch_inferior_registers (regcache
, -1);
434 fetch_fpregs (regcache
, tid
);
438 if (getregs_supplies (regno
))
440 fetch_regs (regcache
, tid
);
444 if (getfpregs_supplies (regno
))
446 fetch_fpregs (regcache
, tid
);
450 internal_error (__FILE__
, __LINE__
,
451 _("Got request for bad register number %d."), regno
);
454 /* Store register REGNO back into the child process. If REGNO is -1,
455 do this for all registers (including the floating point and SSE
458 m68k_linux_store_inferior_registers (struct target_ops
*ops
,
459 struct regcache
*regcache
, int regno
)
463 /* Use the old method of poking around in `struct user' if the
464 SETREGS request isn't available. */
465 if (! have_ptrace_getregs
)
467 old_store_inferior_registers (regcache
, regno
);
471 /* GNU/Linux LWP ID's are process ID's. */
472 tid
= TIDGET (inferior_ptid
);
474 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
476 /* Use the PTRACE_SETFPREGS requests whenever possible, since it
477 transfers more registers in one system call. But remember that
478 store_fpregs can fail, and return zero. */
481 store_regs (regcache
, tid
, regno
);
482 store_fpregs (regcache
, tid
, regno
);
486 if (getregs_supplies (regno
))
488 store_regs (regcache
, tid
, regno
);
492 if (getfpregs_supplies (regno
))
494 store_fpregs (regcache
, tid
, regno
);
498 internal_error (__FILE__
, __LINE__
,
499 _("Got request to store bad register number %d."), regno
);
502 /* Interpreting register set info found in core files. */
504 /* Provide registers to GDB from a core file.
506 (We can't use the generic version of this function in
507 core-regset.c, because we need to use elf_gregset_t instead of
510 CORE_REG_SECT points to an array of bytes, which are the contents
511 of a `note' from a core file which BFD thinks might contain
512 register contents. CORE_REG_SIZE is its size.
514 WHICH says which register set corelow suspects this is:
515 0 --- the general-purpose register set, in elf_gregset_t format
516 2 --- the floating-point register set, in elf_fpregset_t format
518 REG_ADDR isn't used on GNU/Linux. */
521 fetch_core_registers (struct regcache
*regcache
,
522 char *core_reg_sect
, unsigned core_reg_size
,
523 int which
, CORE_ADDR reg_addr
)
525 elf_gregset_t gregset
;
526 elf_fpregset_t fpregset
;
531 if (core_reg_size
!= sizeof (gregset
))
532 warning (_("Wrong size gregset in core file."));
535 memcpy (&gregset
, core_reg_sect
, sizeof (gregset
));
536 supply_gregset (regcache
, (const elf_gregset_t
*) &gregset
);
541 if (core_reg_size
!= sizeof (fpregset
))
542 warning (_("Wrong size fpregset in core file."));
545 memcpy (&fpregset
, core_reg_sect
, sizeof (fpregset
));
546 supply_fpregset (regcache
, (const elf_fpregset_t
*) &fpregset
);
551 /* We've covered all the kinds of registers we know about here,
552 so this must be something we wouldn't know what to do with
553 anyway. Just ignore it. */
559 /* Register that we are able to handle GNU/Linux ELF core file
562 static struct core_fns linux_elf_core_fns
=
564 bfd_target_elf_flavour
, /* core_flavour */
565 default_check_format
, /* check_format */
566 default_core_sniffer
, /* core_sniffer */
567 fetch_core_registers
, /* core_read_registers */
571 void _initialize_m68k_linux_nat (void);
574 _initialize_m68k_linux_nat (void)
576 struct target_ops
*t
;
578 /* Fill in the generic GNU/Linux methods. */
581 /* Add our register access methods. */
582 t
->to_fetch_registers
= m68k_linux_fetch_inferior_registers
;
583 t
->to_store_registers
= m68k_linux_store_inferior_registers
;
585 /* Register the target. */
586 linux_nat_add_target (t
);
588 deprecated_add_core_fns (&linux_elf_core_fns
);