1 /* Motorola m68k native support for GNU/Linux.
3 Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
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/>. */
26 #include "gdb_string.h"
29 #include "linux-nat.h"
31 #include "m68k-tdep.h"
33 #include <sys/param.h>
36 #include <sys/ptrace.h>
38 #include <sys/ioctl.h>
40 #include <sys/procfs.h>
49 #include "floatformat.h"
53 /* Prototypes for supply_gregset etc. */
56 /* This table must line up with gdbarch_register_name in "m68k-tdep.c". */
57 static const int regmap
[] =
59 PT_D0
, PT_D1
, PT_D2
, PT_D3
, PT_D4
, PT_D5
, PT_D6
, PT_D7
,
60 PT_A0
, PT_A1
, PT_A2
, PT_A3
, PT_A4
, PT_A5
, PT_A6
, PT_USP
,
62 /* PT_FP0, ..., PT_FP7 */
63 21, 24, 27, 30, 33, 36, 39, 42,
64 /* PT_FPCR, PT_FPSR, PT_FPIAR */
68 /* Which ptrace request retrieves which registers?
69 These apply to the corresponding SET requests as well. */
70 #define NUM_GREGS (18)
71 #define MAX_NUM_REGS (NUM_GREGS + 11)
74 getregs_supplies (int regno
)
76 return 0 <= regno
&& regno
< NUM_GREGS
;
80 getfpregs_supplies (int regno
)
82 return gdbarch_fp0_regnum (current_gdbarch
) <= regno
83 && regno
<= M68K_FPI_REGNUM
;
86 /* Does the current host support the GETREGS request? */
87 int have_ptrace_getregs
=
88 #ifdef HAVE_PTRACE_GETREGS
97 /* Fetching registers directly from the U area, one at a time. */
99 /* FIXME: This duplicates code from `inptrace.c'. The problem is that we
100 define FETCH_INFERIOR_REGISTERS since we want to use our own versions
101 of {fetch,store}_inferior_registers that use the GETREGS request. This
102 means that the code in `infptrace.c' is #ifdef'd out. But we need to
103 fall back on that code when GDB is running on top of a kernel that
104 doesn't support the GETREGS request. */
107 #define PT_READ_U PTRACE_PEEKUSR
110 #define PT_WRITE_U PTRACE_POKEUSR
113 /* Fetch one register. */
116 fetch_register (struct regcache
*regcache
, int regno
)
118 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
119 /* This isn't really an address. But ptrace thinks of it as one. */
121 char mess
[128]; /* For messages */
123 char buf
[MAX_REGISTER_SIZE
];
126 if (gdbarch_cannot_fetch_register (gdbarch
, regno
))
128 memset (buf
, '\0', register_size (gdbarch
, regno
)); /* Supply zeroes */
129 regcache_raw_supply (regcache
, regno
, buf
);
133 /* Overload thread id onto process id */
134 tid
= TIDGET (inferior_ptid
);
136 tid
= PIDGET (inferior_ptid
); /* no thread id, just use process id */
138 regaddr
= 4 * regmap
[regno
];
139 for (i
= 0; i
< register_size (gdbarch
, regno
);
140 i
+= sizeof (PTRACE_TYPE_RET
))
143 *(PTRACE_TYPE_RET
*) &buf
[i
] = ptrace (PT_READ_U
, tid
,
144 (PTRACE_TYPE_ARG3
) regaddr
, 0);
145 regaddr
+= sizeof (PTRACE_TYPE_RET
);
148 sprintf (mess
, "reading register %s (#%d)",
149 gdbarch_register_name (gdbarch
, regno
), regno
);
150 perror_with_name (mess
);
153 regcache_raw_supply (regcache
, regno
, buf
);
156 /* Fetch register values from the inferior.
157 If REGNO is negative, do this for all registers.
158 Otherwise, REGNO specifies which register (so we can save time). */
161 old_fetch_inferior_registers (struct regcache
*regcache
, int regno
)
165 fetch_register (regcache
, regno
);
170 regno
< gdbarch_num_regs (get_regcache_arch (regcache
));
173 fetch_register (regcache
, regno
);
178 /* Store one register. */
181 store_register (const struct regcache
*regcache
, int regno
)
183 struct gdbarch
*gdbarch
= reg_regcache_arch (regcache
);
184 /* This isn't really an address. But ptrace thinks of it as one. */
186 char mess
[128]; /* For messages */
189 char buf
[MAX_REGISTER_SIZE
];
191 if (gdbarch_cannot_store_register (gdbarch
, regno
))
194 /* Overload thread id onto process id */
195 tid
= TIDGET (inferior_ptid
);
197 tid
= PIDGET (inferior_ptid
); /* no thread id, just use process id */
199 regaddr
= 4 * regmap
[regno
];
201 /* Put the contents of regno into a local buffer */
202 regcache_raw_collect (regcache
, regno
, buf
);
204 /* Store the local buffer into the inferior a chunk at the time. */
205 for (i
= 0; i
< register_size (gdbarch
, regno
);
206 i
+= sizeof (PTRACE_TYPE_RET
))
209 ptrace (PT_WRITE_U
, tid
, (PTRACE_TYPE_ARG3
) regaddr
,
210 *(PTRACE_TYPE_RET
*) (buf
+ i
));
211 regaddr
+= sizeof (PTRACE_TYPE_RET
);
214 sprintf (mess
, "writing register %s (#%d)",
215 gdbarch_register_name (gdbarch
, regno
), regno
);
216 perror_with_name (mess
);
221 /* Store our register values back into the inferior.
222 If REGNO is negative, do this for all registers.
223 Otherwise, REGNO specifies which register (so we can save time). */
226 old_store_inferior_registers (const struct regcache
*regcache
, int regno
)
230 store_register (regcache
, regno
);
235 regno
< gdbarch_num_regs (get_regcache_arch (regcache
));
238 store_register (regcache
, regno
);
243 /* Given a pointer to a general register set in /proc format
244 (elf_gregset_t *), unpack the register contents and supply
245 them as gdb's idea of the current register values. */
248 supply_gregset (struct regcache
*regcache
, const elf_gregset_t
*gregsetp
)
250 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
251 const elf_greg_t
*regp
= (const elf_greg_t
*) gregsetp
;
254 for (regi
= M68K_D0_REGNUM
;
255 regi
<= gdbarch_sp_regnum (gdbarch
);
257 regcache_raw_supply (regcache
, regi
, ®p
[regmap
[regi
]]);
258 regcache_raw_supply (regcache
, gdbarch_ps_regnum (gdbarch
),
260 regcache_raw_supply (regcache
,
261 gdbarch_pc_regnum (gdbarch
), ®p
[PT_PC
]);
264 /* Fill register REGNO (if it is a general-purpose register) in
265 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
266 do this for all registers. */
268 fill_gregset (const struct regcache
*regcache
,
269 elf_gregset_t
*gregsetp
, int regno
)
271 elf_greg_t
*regp
= (elf_greg_t
*) gregsetp
;
274 for (i
= 0; i
< NUM_GREGS
; i
++)
275 if (regno
== -1 || regno
== i
)
276 regcache_raw_collect (regcache
, i
, regp
+ regmap
[i
]);
279 #ifdef HAVE_PTRACE_GETREGS
281 /* Fetch all general-purpose registers from process/thread TID and
282 store their values in GDB's register array. */
285 fetch_regs (struct regcache
*regcache
, int tid
)
289 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
293 /* The kernel we're running on doesn't support the GETREGS
294 request. Reset `have_ptrace_getregs'. */
295 have_ptrace_getregs
= 0;
299 perror_with_name (_("Couldn't get registers"));
302 supply_gregset (regcache
, (const elf_gregset_t
*) ®s
);
305 /* Store all valid general-purpose registers in GDB's register array
306 into the process/thread specified by TID. */
309 store_regs (const struct regcache
*regcache
, int tid
, int regno
)
313 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
314 perror_with_name (_("Couldn't get registers"));
316 fill_gregset (regcache
, ®s
, regno
);
318 if (ptrace (PTRACE_SETREGS
, tid
, 0, (int) ®s
) < 0)
319 perror_with_name (_("Couldn't write registers"));
324 static void fetch_regs (struct regcache
*regcache
, int tid
) {}
325 static void store_regs (const struct regcache
*regcache
, int tid
, int regno
) {}
330 /* Transfering floating-point registers between GDB, inferiors and cores. */
332 /* What is the address of fpN within the floating-point register set F? */
333 #define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
335 /* Fill GDB's register array with the floating-point register values in
339 supply_fpregset (struct regcache
*regcache
, const elf_fpregset_t
*fpregsetp
)
341 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
344 for (regi
= gdbarch_fp0_regnum (gdbarch
);
345 regi
< gdbarch_fp0_regnum (gdbarch
) + 8; regi
++)
346 regcache_raw_supply (regcache
, regi
,
347 FPREG_ADDR (fpregsetp
,
348 regi
- gdbarch_fp0_regnum (gdbarch
)));
349 regcache_raw_supply (regcache
, M68K_FPC_REGNUM
, &fpregsetp
->fpcntl
[0]);
350 regcache_raw_supply (regcache
, M68K_FPS_REGNUM
, &fpregsetp
->fpcntl
[1]);
351 regcache_raw_supply (regcache
, M68K_FPI_REGNUM
, &fpregsetp
->fpcntl
[2]);
354 /* Fill register REGNO (if it is a floating-point register) in
355 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
356 do this for all registers. */
359 fill_fpregset (const struct regcache
*regcache
,
360 elf_fpregset_t
*fpregsetp
, int regno
)
362 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
365 /* Fill in the floating-point registers. */
366 for (i
= gdbarch_fp0_regnum (gdbarch
);
367 i
< gdbarch_fp0_regnum (gdbarch
) + 8; i
++)
368 if (regno
== -1 || regno
== i
)
369 regcache_raw_collect (regcache
, i
,
370 FPREG_ADDR (fpregsetp
,
371 i
- gdbarch_fp0_regnum (gdbarch
)));
373 /* Fill in the floating-point control registers. */
374 for (i
= M68K_FPC_REGNUM
; i
<= M68K_FPI_REGNUM
; i
++)
375 if (regno
== -1 || regno
== i
)
376 regcache_raw_collect (regcache
, i
,
377 &fpregsetp
->fpcntl
[i
- M68K_FPC_REGNUM
]);
380 #ifdef HAVE_PTRACE_GETREGS
382 /* Fetch all floating-point registers from process/thread TID and store
383 thier values in GDB's register array. */
386 fetch_fpregs (struct regcache
*regcache
, int tid
)
388 elf_fpregset_t fpregs
;
390 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
391 perror_with_name (_("Couldn't get floating point status"));
393 supply_fpregset (regcache
, (const elf_fpregset_t
*) &fpregs
);
396 /* Store all valid floating-point registers in GDB's register array
397 into the process/thread specified by TID. */
400 store_fpregs (const struct regcache
*regcache
, int tid
, int regno
)
402 elf_fpregset_t fpregs
;
404 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
405 perror_with_name (_("Couldn't get floating point status"));
407 fill_fpregset (regcache
, &fpregs
, regno
);
409 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
410 perror_with_name (_("Couldn't write floating point status"));
415 static void fetch_fpregs (struct regcache
*regcache
, int tid
) {}
416 static void store_fpregs (const struct regcache
*regcache
, int tid
, int regno
) {}
420 /* Transferring arbitrary registers between GDB and inferior. */
422 /* Fetch register REGNO from the child process. If REGNO is -1, do
423 this for all registers (including the floating point and SSE
427 m68k_linux_fetch_inferior_registers (struct regcache
*regcache
, int regno
)
431 /* Use the old method of peeking around in `struct user' if the
432 GETREGS request isn't available. */
433 if (! have_ptrace_getregs
)
435 old_fetch_inferior_registers (regcache
, regno
);
439 /* GNU/Linux LWP ID's are process ID's. */
440 tid
= TIDGET (inferior_ptid
);
442 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
444 /* Use the PTRACE_GETFPXREGS request whenever possible, since it
445 transfers more registers in one system call, and we'll cache the
446 results. But remember that fetch_fpxregs can fail, and return
450 fetch_regs (regcache
, tid
);
452 /* The call above might reset `have_ptrace_getregs'. */
453 if (! have_ptrace_getregs
)
455 old_fetch_inferior_registers (regcache
, -1);
459 fetch_fpregs (regcache
, tid
);
463 if (getregs_supplies (regno
))
465 fetch_regs (regcache
, tid
);
469 if (getfpregs_supplies (regno
))
471 fetch_fpregs (regcache
, tid
);
475 internal_error (__FILE__
, __LINE__
,
476 _("Got request for bad register number %d."), regno
);
479 /* Store register REGNO back into the child process. If REGNO is -1,
480 do this for all registers (including the floating point and SSE
483 m68k_linux_store_inferior_registers (struct regcache
*regcache
, int regno
)
487 /* Use the old method of poking around in `struct user' if the
488 SETREGS request isn't available. */
489 if (! have_ptrace_getregs
)
491 old_store_inferior_registers (regcache
, regno
);
495 /* GNU/Linux LWP ID's are process ID's. */
496 tid
= TIDGET (inferior_ptid
);
498 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
500 /* Use the PTRACE_SETFPREGS requests whenever possible, since it
501 transfers more registers in one system call. But remember that
502 store_fpregs can fail, and return zero. */
505 store_regs (regcache
, tid
, regno
);
506 store_fpregs (regcache
, tid
, regno
);
510 if (getregs_supplies (regno
))
512 store_regs (regcache
, tid
, regno
);
516 if (getfpregs_supplies (regno
))
518 store_fpregs (regcache
, tid
, regno
);
522 internal_error (__FILE__
, __LINE__
,
523 _("Got request to store bad register number %d."), regno
);
526 /* Interpreting register set info found in core files. */
528 /* Provide registers to GDB from a core file.
530 (We can't use the generic version of this function in
531 core-regset.c, because we need to use elf_gregset_t instead of
534 CORE_REG_SECT points to an array of bytes, which are the contents
535 of a `note' from a core file which BFD thinks might contain
536 register contents. CORE_REG_SIZE is its size.
538 WHICH says which register set corelow suspects this is:
539 0 --- the general-purpose register set, in elf_gregset_t format
540 2 --- the floating-point register set, in elf_fpregset_t format
542 REG_ADDR isn't used on GNU/Linux. */
545 fetch_core_registers (struct regcache
*regcache
,
546 char *core_reg_sect
, unsigned core_reg_size
,
547 int which
, CORE_ADDR reg_addr
)
549 elf_gregset_t gregset
;
550 elf_fpregset_t fpregset
;
555 if (core_reg_size
!= sizeof (gregset
))
556 warning (_("Wrong size gregset in core file."));
559 memcpy (&gregset
, core_reg_sect
, sizeof (gregset
));
560 supply_gregset (regcache
, (const elf_gregset_t
*) &gregset
);
565 if (core_reg_size
!= sizeof (fpregset
))
566 warning (_("Wrong size fpregset in core file."));
569 memcpy (&fpregset
, core_reg_sect
, sizeof (fpregset
));
570 supply_fpregset (regcache
, (const elf_fpregset_t
*) &fpregset
);
575 /* We've covered all the kinds of registers we know about here,
576 so this must be something we wouldn't know what to do with
577 anyway. Just ignore it. */
583 /* Register that we are able to handle GNU/Linux ELF core file
586 static struct core_fns linux_elf_core_fns
=
588 bfd_target_elf_flavour
, /* core_flavour */
589 default_check_format
, /* check_format */
590 default_core_sniffer
, /* core_sniffer */
591 fetch_core_registers
, /* core_read_registers */
595 void _initialize_m68k_linux_nat (void);
598 _initialize_m68k_linux_nat (void)
600 struct target_ops
*t
;
602 /* Fill in the generic GNU/Linux methods. */
605 /* Add our register access methods. */
606 t
->to_fetch_registers
= m68k_linux_fetch_inferior_registers
;
607 t
->to_store_registers
= m68k_linux_store_inferior_registers
;
609 /* Register the target. */
610 linux_nat_add_target (t
);
612 deprecated_add_core_fns (&linux_elf_core_fns
);