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 /* This table must line up with 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 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 /* BLOCKEND is the value of u.u_ar0, and points to the place where GS
99 m68k_linux_register_u_addr (int blockend
, int regnum
)
101 return (blockend
+ 4 * regmap
[regnum
]);
105 /* Fetching registers directly from the U area, one at a time. */
107 /* FIXME: This duplicates code from `inptrace.c'. The problem is that we
108 define FETCH_INFERIOR_REGISTERS since we want to use our own versions
109 of {fetch,store}_inferior_registers that use the GETREGS request. This
110 means that the code in `infptrace.c' is #ifdef'd out. But we need to
111 fall back on that code when GDB is running on top of a kernel that
112 doesn't support the GETREGS request. */
115 #define PT_READ_U PTRACE_PEEKUSR
118 #define PT_WRITE_U PTRACE_POKEUSR
121 /* Fetch one register. */
124 fetch_register (int regno
)
126 /* This isn't really an address. But ptrace thinks of it as one. */
128 char mess
[128]; /* For messages */
130 unsigned int offset
; /* Offset of registers within the u area. */
131 char buf
[MAX_REGISTER_SIZE
];
134 if (CANNOT_FETCH_REGISTER (regno
))
136 memset (buf
, '\0', register_size (current_gdbarch
, regno
)); /* Supply zeroes */
137 regcache_raw_supply (current_regcache
, regno
, buf
);
141 /* Overload thread id onto process id */
142 tid
= TIDGET (inferior_ptid
);
144 tid
= PIDGET (inferior_ptid
); /* no thread id, just use process id */
146 offset
= U_REGS_OFFSET
;
148 regaddr
= register_addr (regno
, offset
);
149 for (i
= 0; i
< register_size (current_gdbarch
, regno
);
150 i
+= sizeof (PTRACE_TYPE_RET
))
153 *(PTRACE_TYPE_RET
*) &buf
[i
] = ptrace (PT_READ_U
, tid
,
154 (PTRACE_TYPE_ARG3
) regaddr
, 0);
155 regaddr
+= sizeof (PTRACE_TYPE_RET
);
158 sprintf (mess
, "reading register %s (#%d)",
159 REGISTER_NAME (regno
), regno
);
160 perror_with_name (mess
);
163 regcache_raw_supply (current_regcache
, regno
, buf
);
166 /* Fetch register values from the inferior.
167 If REGNO is negative, do this for all registers.
168 Otherwise, REGNO specifies which register (so we can save time). */
171 old_fetch_inferior_registers (int regno
)
175 fetch_register (regno
);
179 for (regno
= 0; regno
< NUM_REGS
; regno
++)
181 fetch_register (regno
);
186 /* Store one register. */
189 store_register (int regno
)
191 /* This isn't really an address. But ptrace thinks of it as one. */
193 char mess
[128]; /* For messages */
195 unsigned int offset
; /* Offset of registers within the u area. */
197 char buf
[MAX_REGISTER_SIZE
];
199 if (CANNOT_STORE_REGISTER (regno
))
204 /* Overload thread id onto process id */
205 tid
= TIDGET (inferior_ptid
);
207 tid
= PIDGET (inferior_ptid
); /* no thread id, just use process id */
209 offset
= U_REGS_OFFSET
;
211 regaddr
= register_addr (regno
, offset
);
213 /* Put the contents of regno into a local buffer */
214 regcache_raw_collect (current_regcache
, regno
, buf
);
216 /* Store the local buffer into the inferior a chunk at the time. */
217 for (i
= 0; i
< register_size (current_gdbarch
, regno
);
218 i
+= sizeof (PTRACE_TYPE_RET
))
221 ptrace (PT_WRITE_U
, tid
, (PTRACE_TYPE_ARG3
) regaddr
,
222 *(PTRACE_TYPE_RET
*) (buf
+ i
));
223 regaddr
+= sizeof (PTRACE_TYPE_RET
);
226 sprintf (mess
, "writing register %s (#%d)",
227 REGISTER_NAME (regno
), regno
);
228 perror_with_name (mess
);
233 /* Store our register values back into the inferior.
234 If REGNO is negative, do this for all registers.
235 Otherwise, REGNO specifies which register (so we can save time). */
238 old_store_inferior_registers (int regno
)
242 store_register (regno
);
246 for (regno
= 0; regno
< NUM_REGS
; regno
++)
248 store_register (regno
);
253 /* Given a pointer to a general register set in /proc format
254 (elf_gregset_t *), unpack the register contents and supply
255 them as gdb's idea of the current register values. */
258 /* Note both m68k-tdep.c and m68klinux-nat.c contain definitions
259 for supply_gregset and supply_fpregset. The definitions
260 in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise,
261 the definitions in m68klinux-nat.c will be used. This is a
262 bit of a hack. The supply_* routines do not belong in
263 *_tdep.c files. But, there are several lynx ports that currently
264 depend on these definitions. */
268 /* Prototypes for supply_gregset etc. */
272 supply_gregset (elf_gregset_t
*gregsetp
)
274 elf_greg_t
*regp
= (elf_greg_t
*) gregsetp
;
277 for (regi
= M68K_D0_REGNUM
; regi
<= SP_REGNUM
; regi
++)
278 regcache_raw_supply (current_regcache
, regi
, (char *) ®p
[regmap
[regi
]]);
279 regcache_raw_supply (current_regcache
, PS_REGNUM
, (char *) ®p
[PT_SR
]);
280 regcache_raw_supply (current_regcache
, PC_REGNUM
, (char *) ®p
[PT_PC
]);
283 /* Fill register REGNO (if it is a general-purpose register) in
284 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
285 do this for all registers. */
287 fill_gregset (elf_gregset_t
*gregsetp
, int regno
)
289 elf_greg_t
*regp
= (elf_greg_t
*) gregsetp
;
292 for (i
= 0; i
< NUM_GREGS
; i
++)
293 if (regno
== -1 || regno
== i
)
294 regcache_raw_collect (current_regcache
, i
, regp
+ regmap
[i
]);
297 #ifdef HAVE_PTRACE_GETREGS
299 /* Fetch all general-purpose registers from process/thread TID and
300 store their values in GDB's register array. */
307 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
311 /* The kernel we're running on doesn't support the GETREGS
312 request. Reset `have_ptrace_getregs'. */
313 have_ptrace_getregs
= 0;
317 perror_with_name (_("Couldn't get registers"));
320 supply_gregset (®s
);
323 /* Store all valid general-purpose registers in GDB's register array
324 into the process/thread specified by TID. */
327 store_regs (int tid
, int regno
)
331 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
332 perror_with_name (_("Couldn't get registers"));
334 fill_gregset (®s
, regno
);
336 if (ptrace (PTRACE_SETREGS
, tid
, 0, (int) ®s
) < 0)
337 perror_with_name (_("Couldn't write registers"));
342 static void fetch_regs (int tid
) {}
343 static void store_regs (int tid
, int regno
) {}
348 /* Transfering floating-point registers between GDB, inferiors and cores. */
350 /* What is the address of fpN within the floating-point register set F? */
351 #define FPREG_ADDR(f, n) ((char *) &(f)->fpregs[(n) * 3])
353 /* Fill GDB's register array with the floating-point register values in
357 supply_fpregset (elf_fpregset_t
*fpregsetp
)
361 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 8; regi
++)
362 regcache_raw_supply (current_regcache
, regi
,
363 FPREG_ADDR (fpregsetp
, regi
- FP0_REGNUM
));
364 regcache_raw_supply (current_regcache
, M68K_FPC_REGNUM
,
365 (char *) &fpregsetp
->fpcntl
[0]);
366 regcache_raw_supply (current_regcache
, M68K_FPS_REGNUM
,
367 (char *) &fpregsetp
->fpcntl
[1]);
368 regcache_raw_supply (current_regcache
, M68K_FPI_REGNUM
,
369 (char *) &fpregsetp
->fpcntl
[2]);
372 /* Fill register REGNO (if it is a floating-point register) in
373 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
374 do this for all registers. */
377 fill_fpregset (elf_fpregset_t
*fpregsetp
, int regno
)
381 /* Fill in the floating-point registers. */
382 for (i
= FP0_REGNUM
; i
< FP0_REGNUM
+ 8; i
++)
383 if (regno
== -1 || regno
== i
)
384 regcache_raw_collect (current_regcache
, i
,
385 FPREG_ADDR (fpregsetp
, i
- FP0_REGNUM
));
387 /* Fill in the floating-point control registers. */
388 for (i
= M68K_FPC_REGNUM
; i
<= M68K_FPI_REGNUM
; i
++)
389 if (regno
== -1 || regno
== i
)
390 regcache_raw_collect (current_regcache
, i
,
391 (char *) &fpregsetp
->fpcntl
[i
- M68K_FPC_REGNUM
]);
394 #ifdef HAVE_PTRACE_GETREGS
396 /* Fetch all floating-point registers from process/thread TID and store
397 thier values in GDB's register array. */
400 fetch_fpregs (int tid
)
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 supply_fpregset (&fpregs
);
410 /* Store all valid floating-point registers in GDB's register array
411 into the process/thread specified by TID. */
414 store_fpregs (int tid
, int regno
)
416 elf_fpregset_t fpregs
;
418 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
419 perror_with_name (_("Couldn't get floating point status"));
421 fill_fpregset (&fpregs
, regno
);
423 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
424 perror_with_name (_("Couldn't write floating point status"));
429 static void fetch_fpregs (int tid
) {}
430 static void store_fpregs (int tid
, int regno
) {}
436 /* Transferring arbitrary registers between GDB and inferior. */
438 /* Fetch register REGNO from the child process. If REGNO is -1, do
439 this for all registers (including the floating point and SSE
443 m68k_linux_fetch_inferior_registers (int regno
)
447 /* Use the old method of peeking around in `struct user' if the
448 GETREGS request isn't available. */
449 if (! have_ptrace_getregs
)
451 old_fetch_inferior_registers (regno
);
455 /* GNU/Linux LWP ID's are process ID's. */
456 tid
= TIDGET (inferior_ptid
);
458 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
460 /* Use the PTRACE_GETFPXREGS request whenever possible, since it
461 transfers more registers in one system call, and we'll cache the
462 results. But remember that fetch_fpxregs can fail, and return
468 /* The call above might reset `have_ptrace_getregs'. */
469 if (! have_ptrace_getregs
)
471 old_fetch_inferior_registers (-1);
479 if (getregs_supplies (regno
))
485 if (getfpregs_supplies (regno
))
491 internal_error (__FILE__
, __LINE__
,
492 _("Got request for bad register number %d."), regno
);
495 /* Store register REGNO back into the child process. If REGNO is -1,
496 do this for all registers (including the floating point and SSE
499 m68k_linux_store_inferior_registers (int regno
)
503 /* Use the old method of poking around in `struct user' if the
504 SETREGS request isn't available. */
505 if (! have_ptrace_getregs
)
507 old_store_inferior_registers (regno
);
511 /* GNU/Linux LWP ID's are process ID's. */
512 tid
= TIDGET (inferior_ptid
);
514 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
516 /* Use the PTRACE_SETFPREGS requests whenever possible, since it
517 transfers more registers in one system call. But remember that
518 store_fpregs can fail, and return zero. */
521 store_regs (tid
, regno
);
522 store_fpregs (tid
, regno
);
526 if (getregs_supplies (regno
))
528 store_regs (tid
, regno
);
532 if (getfpregs_supplies (regno
))
534 store_fpregs (tid
, regno
);
538 internal_error (__FILE__
, __LINE__
,
539 _("Got request to store bad register number %d."), regno
);
542 /* Interpreting register set info found in core files. */
544 /* Provide registers to GDB from a core file.
546 (We can't use the generic version of this function in
547 core-regset.c, because we need to use elf_gregset_t instead of
550 CORE_REG_SECT points to an array of bytes, which are the contents
551 of a `note' from a core file which BFD thinks might contain
552 register contents. CORE_REG_SIZE is its size.
554 WHICH says which register set corelow suspects this is:
555 0 --- the general-purpose register set, in elf_gregset_t format
556 2 --- the floating-point register set, in elf_fpregset_t format
558 REG_ADDR isn't used on GNU/Linux. */
561 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
562 int which
, CORE_ADDR reg_addr
)
564 elf_gregset_t gregset
;
565 elf_fpregset_t fpregset
;
570 if (core_reg_size
!= sizeof (gregset
))
571 warning (_("Wrong size gregset in core file."));
574 memcpy (&gregset
, core_reg_sect
, sizeof (gregset
));
575 supply_gregset (&gregset
);
580 if (core_reg_size
!= sizeof (fpregset
))
581 warning (_("Wrong size fpregset in core file."));
584 memcpy (&fpregset
, core_reg_sect
, sizeof (fpregset
));
585 supply_fpregset (&fpregset
);
590 /* We've covered all the kinds of registers we know about here,
591 so this must be something we wouldn't know what to do with
592 anyway. Just ignore it. */
601 return (sizeof (struct user
));
604 /* Register that we are able to handle GNU/Linux ELF core file
607 static struct core_fns linux_elf_core_fns
=
609 bfd_target_elf_flavour
, /* core_flavour */
610 default_check_format
, /* check_format */
611 default_core_sniffer
, /* core_sniffer */
612 fetch_core_registers
, /* core_read_registers */
616 void _initialize_m68k_linux_nat (void);
619 _initialize_m68k_linux_nat (void)
621 struct target_ops
*t
;
623 /* Fill in the generic GNU/Linux methods. */
626 /* Add our register access methods. */
627 t
->to_fetch_registers
= m68k_linux_fetch_inferior_registers
;
628 t
->to_store_registers
= m68k_linux_store_inferior_registers
;
630 /* Register the target. */
631 linux_nat_add_target (t
);
633 deprecated_add_core_fns (&linux_elf_core_fns
);