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 2 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, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
28 #include "gdb_string.h"
31 #include "linux-nat.h"
33 #include "m68k-tdep.h"
35 #include <sys/param.h>
38 #include <sys/ptrace.h>
40 #include <sys/ioctl.h>
42 #include <sys/procfs.h>
51 #include "floatformat.h"
55 /* Prototypes for supply_gregset etc. */
58 /* This table must line up with gdbarch_register_name in "m68k-tdep.c". */
59 static const int regmap
[] =
61 PT_D0
, PT_D1
, PT_D2
, PT_D3
, PT_D4
, PT_D5
, PT_D6
, PT_D7
,
62 PT_A0
, PT_A1
, PT_A2
, PT_A3
, PT_A4
, PT_A5
, PT_A6
, PT_USP
,
64 /* PT_FP0, ..., PT_FP7 */
65 21, 24, 27, 30, 33, 36, 39, 42,
66 /* PT_FPCR, PT_FPSR, PT_FPIAR */
70 /* Which ptrace request retrieves which registers?
71 These apply to the corresponding SET requests as well. */
72 #define NUM_GREGS (18)
73 #define MAX_NUM_REGS (NUM_GREGS + 11)
76 getregs_supplies (int regno
)
78 return 0 <= regno
&& regno
< NUM_GREGS
;
82 getfpregs_supplies (int regno
)
84 return FP0_REGNUM
<= regno
&& regno
<= M68K_FPI_REGNUM
;
87 /* Does the current host support the GETREGS request? */
88 int have_ptrace_getregs
=
89 #ifdef HAVE_PTRACE_GETREGS
98 /* Fetching registers directly from the U area, one at a time. */
100 /* FIXME: This duplicates code from `inptrace.c'. The problem is that we
101 define FETCH_INFERIOR_REGISTERS since we want to use our own versions
102 of {fetch,store}_inferior_registers that use the GETREGS request. This
103 means that the code in `infptrace.c' is #ifdef'd out. But we need to
104 fall back on that code when GDB is running on top of a kernel that
105 doesn't support the GETREGS request. */
108 #define PT_READ_U PTRACE_PEEKUSR
111 #define PT_WRITE_U PTRACE_POKEUSR
114 /* Fetch one register. */
117 fetch_register (struct regcache
*regcache
, int regno
)
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 (current_gdbarch
, regno
))
128 memset (buf
, '\0', register_size (current_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 (current_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 (current_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
);
169 for (regno
= 0; regno
< gdbarch_num_regs (current_gdbarch
); regno
++)
171 fetch_register (regcache
, regno
);
176 /* Store one register. */
179 store_register (const struct regcache
*regcache
, int regno
)
181 /* This isn't really an address. But ptrace thinks of it as one. */
183 char mess
[128]; /* For messages */
186 char buf
[MAX_REGISTER_SIZE
];
188 if (gdbarch_cannot_store_register (current_gdbarch
, regno
))
191 /* Overload thread id onto process id */
192 tid
= TIDGET (inferior_ptid
);
194 tid
= PIDGET (inferior_ptid
); /* no thread id, just use process id */
196 regaddr
= 4 * regmap
[regno
];
198 /* Put the contents of regno into a local buffer */
199 regcache_raw_collect (regcache
, regno
, buf
);
201 /* Store the local buffer into the inferior a chunk at the time. */
202 for (i
= 0; i
< register_size (current_gdbarch
, regno
);
203 i
+= sizeof (PTRACE_TYPE_RET
))
206 ptrace (PT_WRITE_U
, tid
, (PTRACE_TYPE_ARG3
) regaddr
,
207 *(PTRACE_TYPE_RET
*) (buf
+ i
));
208 regaddr
+= sizeof (PTRACE_TYPE_RET
);
211 sprintf (mess
, "writing register %s (#%d)",
212 gdbarch_register_name (current_gdbarch
, regno
), regno
);
213 perror_with_name (mess
);
218 /* Store our register values back into the inferior.
219 If REGNO is negative, do this for all registers.
220 Otherwise, REGNO specifies which register (so we can save time). */
223 old_store_inferior_registers (const struct regcache
*regcache
, int regno
)
227 store_register (regcache
, regno
);
231 for (regno
= 0; regno
< gdbarch_num_regs (current_gdbarch
); regno
++)
233 store_register (regcache
, regno
);
238 /* Given a pointer to a general register set in /proc format
239 (elf_gregset_t *), unpack the register contents and supply
240 them as gdb's idea of the current register values. */
243 supply_gregset (struct regcache
*regcache
, const elf_gregset_t
*gregsetp
)
245 const elf_greg_t
*regp
= (const elf_greg_t
*) gregsetp
;
248 for (regi
= M68K_D0_REGNUM
; regi
<= SP_REGNUM
; regi
++)
249 regcache_raw_supply (regcache
, regi
, ®p
[regmap
[regi
]]);
250 regcache_raw_supply (regcache
, PS_REGNUM
, ®p
[PT_SR
]);
251 regcache_raw_supply (regcache
, PC_REGNUM
, ®p
[PT_PC
]);
254 /* Fill register REGNO (if it is a general-purpose register) in
255 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
256 do this for all registers. */
258 fill_gregset (const struct regcache
*regcache
,
259 elf_gregset_t
*gregsetp
, int regno
)
261 elf_greg_t
*regp
= (elf_greg_t
*) gregsetp
;
264 for (i
= 0; i
< NUM_GREGS
; i
++)
265 if (regno
== -1 || regno
== i
)
266 regcache_raw_collect (regcache
, i
, regp
+ regmap
[i
]);
269 #ifdef HAVE_PTRACE_GETREGS
271 /* Fetch all general-purpose registers from process/thread TID and
272 store their values in GDB's register array. */
275 fetch_regs (struct regcache
*regcache
, int tid
)
279 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
283 /* The kernel we're running on doesn't support the GETREGS
284 request. Reset `have_ptrace_getregs'. */
285 have_ptrace_getregs
= 0;
289 perror_with_name (_("Couldn't get registers"));
292 supply_gregset (regcache
, (const elf_gregset_t
*) ®s
);
295 /* Store all valid general-purpose registers in GDB's register array
296 into the process/thread specified by TID. */
299 store_regs (const struct regcache
*regcache
, int tid
, int regno
)
303 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
304 perror_with_name (_("Couldn't get registers"));
306 fill_gregset (regcache
, ®s
, regno
);
308 if (ptrace (PTRACE_SETREGS
, tid
, 0, (int) ®s
) < 0)
309 perror_with_name (_("Couldn't write registers"));
314 static void fetch_regs (struct regcache
*regcache
, int tid
) {}
315 static void store_regs (const struct regcache
*regcache
, int tid
, int regno
) {}
320 /* Transfering floating-point registers between GDB, inferiors and cores. */
322 /* What is the address of fpN within the floating-point register set F? */
323 #define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
325 /* Fill GDB's register array with the floating-point register values in
329 supply_fpregset (struct regcache
*regcache
, const elf_fpregset_t
*fpregsetp
)
333 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 8; regi
++)
334 regcache_raw_supply (regcache
, regi
,
335 FPREG_ADDR (fpregsetp
, regi
- FP0_REGNUM
));
336 regcache_raw_supply (regcache
, M68K_FPC_REGNUM
, &fpregsetp
->fpcntl
[0]);
337 regcache_raw_supply (regcache
, M68K_FPS_REGNUM
, &fpregsetp
->fpcntl
[1]);
338 regcache_raw_supply (regcache
, M68K_FPI_REGNUM
, &fpregsetp
->fpcntl
[2]);
341 /* Fill register REGNO (if it is a floating-point register) in
342 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
343 do this for all registers. */
346 fill_fpregset (const struct regcache
*regcache
,
347 elf_fpregset_t
*fpregsetp
, int regno
)
351 /* Fill in the floating-point registers. */
352 for (i
= FP0_REGNUM
; i
< FP0_REGNUM
+ 8; i
++)
353 if (regno
== -1 || regno
== i
)
354 regcache_raw_collect (regcache
, i
,
355 FPREG_ADDR (fpregsetp
, i
- FP0_REGNUM
));
357 /* Fill in the floating-point control registers. */
358 for (i
= M68K_FPC_REGNUM
; i
<= M68K_FPI_REGNUM
; i
++)
359 if (regno
== -1 || regno
== i
)
360 regcache_raw_collect (regcache
, i
,
361 &fpregsetp
->fpcntl
[i
- M68K_FPC_REGNUM
]);
364 #ifdef HAVE_PTRACE_GETREGS
366 /* Fetch all floating-point registers from process/thread TID and store
367 thier values in GDB's register array. */
370 fetch_fpregs (struct regcache
*regcache
, int tid
)
372 elf_fpregset_t fpregs
;
374 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
375 perror_with_name (_("Couldn't get floating point status"));
377 supply_fpregset (regcache
, (const elf_fpregset_t
*) &fpregs
);
380 /* Store all valid floating-point registers in GDB's register array
381 into the process/thread specified by TID. */
384 store_fpregs (const struct regcache
*regcache
, int tid
, int regno
)
386 elf_fpregset_t fpregs
;
388 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
389 perror_with_name (_("Couldn't get floating point status"));
391 fill_fpregset (regcache
, &fpregs
, regno
);
393 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
394 perror_with_name (_("Couldn't write floating point status"));
399 static void fetch_fpregs (struct regcache
*regcache
, int tid
) {}
400 static void store_fpregs (const struct regcache
*regcache
, int tid
, int regno
) {}
404 /* Transferring arbitrary registers between GDB and inferior. */
406 /* Fetch register REGNO from the child process. If REGNO is -1, do
407 this for all registers (including the floating point and SSE
411 m68k_linux_fetch_inferior_registers (struct regcache
*regcache
, int regno
)
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
);
423 /* GNU/Linux LWP ID's are process ID's. */
424 tid
= TIDGET (inferior_ptid
);
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
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);
443 fetch_fpregs (regcache
, tid
);
447 if (getregs_supplies (regno
))
449 fetch_regs (regcache
, tid
);
453 if (getfpregs_supplies (regno
))
455 fetch_fpregs (regcache
, tid
);
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
467 m68k_linux_store_inferior_registers (struct regcache
*regcache
, int regno
)
471 /* Use the old method of poking around in `struct user' if the
472 SETREGS request isn't available. */
473 if (! have_ptrace_getregs
)
475 old_store_inferior_registers (regcache
, regno
);
479 /* GNU/Linux LWP ID's are process ID's. */
480 tid
= TIDGET (inferior_ptid
);
482 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
484 /* Use the PTRACE_SETFPREGS requests whenever possible, since it
485 transfers more registers in one system call. But remember that
486 store_fpregs can fail, and return zero. */
489 store_regs (regcache
, tid
, regno
);
490 store_fpregs (regcache
, tid
, regno
);
494 if (getregs_supplies (regno
))
496 store_regs (regcache
, tid
, regno
);
500 if (getfpregs_supplies (regno
))
502 store_fpregs (regcache
, tid
, regno
);
506 internal_error (__FILE__
, __LINE__
,
507 _("Got request to store bad register number %d."), regno
);
510 /* Interpreting register set info found in core files. */
512 /* Provide registers to GDB from a core file.
514 (We can't use the generic version of this function in
515 core-regset.c, because we need to use elf_gregset_t instead of
518 CORE_REG_SECT points to an array of bytes, which are the contents
519 of a `note' from a core file which BFD thinks might contain
520 register contents. CORE_REG_SIZE is its size.
522 WHICH says which register set corelow suspects this is:
523 0 --- the general-purpose register set, in elf_gregset_t format
524 2 --- the floating-point register set, in elf_fpregset_t format
526 REG_ADDR isn't used on GNU/Linux. */
529 fetch_core_registers (struct regcache
*regcache
,
530 char *core_reg_sect
, unsigned core_reg_size
,
531 int which
, CORE_ADDR reg_addr
)
533 elf_gregset_t gregset
;
534 elf_fpregset_t fpregset
;
539 if (core_reg_size
!= sizeof (gregset
))
540 warning (_("Wrong size gregset in core file."));
543 memcpy (&gregset
, core_reg_sect
, sizeof (gregset
));
544 supply_gregset (regcache
, (const elf_gregset_t
*) &gregset
);
549 if (core_reg_size
!= sizeof (fpregset
))
550 warning (_("Wrong size fpregset in core file."));
553 memcpy (&fpregset
, core_reg_sect
, sizeof (fpregset
));
554 supply_fpregset (regcache
, (const elf_fpregset_t
*) &fpregset
);
559 /* We've covered all the kinds of registers we know about here,
560 so this must be something we wouldn't know what to do with
561 anyway. Just ignore it. */
567 /* Register that we are able to handle GNU/Linux ELF core file
570 static struct core_fns linux_elf_core_fns
=
572 bfd_target_elf_flavour
, /* core_flavour */
573 default_check_format
, /* check_format */
574 default_core_sniffer
, /* core_sniffer */
575 fetch_core_registers
, /* core_read_registers */
579 void _initialize_m68k_linux_nat (void);
582 _initialize_m68k_linux_nat (void)
584 struct target_ops
*t
;
586 /* Fill in the generic GNU/Linux methods. */
589 /* Add our register access methods. */
590 t
->to_fetch_registers
= m68k_linux_fetch_inferior_registers
;
591 t
->to_store_registers
= m68k_linux_store_inferior_registers
;
593 /* Register the target. */
594 linux_nat_add_target (t
);
596 deprecated_add_core_fns (&linux_elf_core_fns
);