1 /* Motorola m68k native support for GNU/Linux.
3 Copyright 1996, 1998, 2000, 2001, 2002 Free Software Foundation,
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., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
28 #include "gdb_string.h"
31 #include "m68k-tdep.h"
34 #include <sys/types.h>
37 #include <sys/param.h>
40 #include <sys/ptrace.h>
42 #include <sys/ioctl.h>
44 #include <sys/procfs.h>
53 #include "floatformat.h"
57 /* This table must line up with REGISTER_NAMES in tm-m68k.h */
58 static const int regmap
[] =
60 PT_D0
, PT_D1
, PT_D2
, PT_D3
, PT_D4
, PT_D5
, PT_D6
, PT_D7
,
61 PT_A0
, PT_A1
, PT_A2
, PT_A3
, PT_A4
, PT_A5
, PT_A6
, PT_USP
,
63 /* PT_FP0, ..., PT_FP7 */
64 21, 24, 27, 30, 33, 36, 39, 42,
65 /* PT_FPCR, PT_FPSR, PT_FPIAR */
69 /* Which ptrace request retrieves which registers?
70 These apply to the corresponding SET requests as well. */
71 #define NUM_GREGS (18)
72 #define MAX_NUM_REGS (NUM_GREGS + 11)
75 getregs_supplies (int regno
)
77 return 0 <= regno
&& regno
< NUM_GREGS
;
81 getfpregs_supplies (int regno
)
83 return FP0_REGNUM
<= regno
&& regno
<= M68K_FPI_REGNUM
;
86 /* Does the current host support the GETREGS request? */
87 int have_ptrace_getregs
=
88 #ifdef HAVE_PTRACE_GETREGS
97 /* BLOCKEND is the value of u.u_ar0, and points to the place where GS
101 m68k_linux_register_u_addr (int blockend
, int regnum
)
103 return (blockend
+ 4 * regmap
[regnum
]);
107 /* Fetching registers directly from the U area, one at a time. */
109 /* FIXME: This duplicates code from `inptrace.c'. The problem is that we
110 define FETCH_INFERIOR_REGISTERS since we want to use our own versions
111 of {fetch,store}_inferior_registers that use the GETREGS request. This
112 means that the code in `infptrace.c' is #ifdef'd out. But we need to
113 fall back on that code when GDB is running on top of a kernel that
114 doesn't support the GETREGS request. */
117 #define PT_READ_U PTRACE_PEEKUSR
120 #define PT_WRITE_U PTRACE_POKEUSR
123 /* Default the type of the ptrace transfer to int. */
124 #ifndef PTRACE_XFER_TYPE
125 #define PTRACE_XFER_TYPE int
128 /* Fetch one register. */
131 fetch_register (int regno
)
133 /* This isn't really an address. But ptrace thinks of it as one. */
135 char mess
[128]; /* For messages */
137 unsigned int offset
; /* Offset of registers within the u area. */
138 char buf
[MAX_REGISTER_SIZE
];
141 if (CANNOT_FETCH_REGISTER (regno
))
143 memset (buf
, '\0', register_size (current_gdbarch
, regno
)); /* Supply zeroes */
144 supply_register (regno
, buf
);
148 /* Overload thread id onto process id */
149 tid
= TIDGET (inferior_ptid
);
151 tid
= PIDGET (inferior_ptid
); /* no thread id, just use process id */
153 offset
= U_REGS_OFFSET
;
155 regaddr
= register_addr (regno
, offset
);
156 for (i
= 0; i
< register_size (current_gdbarch
, regno
);
157 i
+= sizeof (PTRACE_XFER_TYPE
))
160 *(PTRACE_XFER_TYPE
*) &buf
[i
] = ptrace (PT_READ_U
, tid
,
161 (PTRACE_ARG3_TYPE
) regaddr
, 0);
162 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
165 sprintf (mess
, "reading register %s (#%d)",
166 REGISTER_NAME (regno
), regno
);
167 perror_with_name (mess
);
170 supply_register (regno
, buf
);
173 /* Fetch register values from the inferior.
174 If REGNO is negative, do this for all registers.
175 Otherwise, REGNO specifies which register (so we can save time). */
178 old_fetch_inferior_registers (int regno
)
182 fetch_register (regno
);
186 for (regno
= 0; regno
< NUM_REGS
; regno
++)
188 fetch_register (regno
);
193 /* Store one register. */
196 store_register (int regno
)
198 /* This isn't really an address. But ptrace thinks of it as one. */
200 char mess
[128]; /* For messages */
202 unsigned int offset
; /* Offset of registers within the u area. */
204 char buf
[MAX_REGISTER_SIZE
];
206 if (CANNOT_STORE_REGISTER (regno
))
211 /* Overload thread id onto process id */
212 tid
= TIDGET (inferior_ptid
);
214 tid
= PIDGET (inferior_ptid
); /* no thread id, just use process id */
216 offset
= U_REGS_OFFSET
;
218 regaddr
= register_addr (regno
, offset
);
220 /* Put the contents of regno into a local buffer */
221 regcache_collect (regno
, buf
);
223 /* Store the local buffer into the inferior a chunk at the time. */
224 for (i
= 0; i
< register_size (current_gdbarch
, regno
);
225 i
+= sizeof (PTRACE_XFER_TYPE
))
228 ptrace (PT_WRITE_U
, tid
, (PTRACE_ARG3_TYPE
) regaddr
,
229 *(PTRACE_XFER_TYPE
*) (buf
+ i
));
230 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
233 sprintf (mess
, "writing register %s (#%d)",
234 REGISTER_NAME (regno
), regno
);
235 perror_with_name (mess
);
240 /* Store our register values back into the inferior.
241 If REGNO is negative, do this for all registers.
242 Otherwise, REGNO specifies which register (so we can save time). */
245 old_store_inferior_registers (int regno
)
249 store_register (regno
);
253 for (regno
= 0; regno
< NUM_REGS
; regno
++)
255 store_register (regno
);
260 /* Given a pointer to a general register set in /proc format
261 (elf_gregset_t *), unpack the register contents and supply
262 them as gdb's idea of the current register values. */
265 /* Note both m68k-tdep.c and m68klinux-nat.c contain definitions
266 for supply_gregset and supply_fpregset. The definitions
267 in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise,
268 the definitions in m68klinux-nat.c will be used. This is a
269 bit of a hack. The supply_* routines do not belong in
270 *_tdep.c files. But, there are several lynx ports that currently
271 depend on these definitions. */
275 /* Prototypes for supply_gregset etc. */
279 supply_gregset (elf_gregset_t
*gregsetp
)
281 elf_greg_t
*regp
= (elf_greg_t
*) gregsetp
;
284 for (regi
= M68K_D0_REGNUM
; regi
<= SP_REGNUM
; regi
++)
285 supply_register (regi
, (char *) ®p
[regmap
[regi
]]);
286 supply_register (PS_REGNUM
, (char *) ®p
[PT_SR
]);
287 supply_register (PC_REGNUM
, (char *) ®p
[PT_PC
]);
290 /* Fill register REGNO (if it is a general-purpose register) in
291 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
292 do this for all registers. */
294 fill_gregset (elf_gregset_t
*gregsetp
, int regno
)
296 elf_greg_t
*regp
= (elf_greg_t
*) gregsetp
;
299 for (i
= 0; i
< NUM_GREGS
; i
++)
300 if (regno
== -1 || regno
== i
)
301 regcache_collect (i
, regp
+ regmap
[i
]);
304 #ifdef HAVE_PTRACE_GETREGS
306 /* Fetch all general-purpose registers from process/thread TID and
307 store their values in GDB's register array. */
314 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
318 /* The kernel we're running on doesn't support the GETREGS
319 request. Reset `have_ptrace_getregs'. */
320 have_ptrace_getregs
= 0;
324 perror_with_name ("Couldn't get registers");
327 supply_gregset (®s
);
330 /* Store all valid general-purpose registers in GDB's register array
331 into the process/thread specified by TID. */
334 store_regs (int tid
, int regno
)
338 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
339 perror_with_name ("Couldn't get registers");
341 fill_gregset (®s
, regno
);
343 if (ptrace (PTRACE_SETREGS
, tid
, 0, (int) ®s
) < 0)
344 perror_with_name ("Couldn't write registers");
349 static void fetch_regs (int tid
) {}
350 static void store_regs (int tid
, int regno
) {}
355 /* Transfering floating-point registers between GDB, inferiors and cores. */
357 /* What is the address of fpN within the floating-point register set F? */
358 #define FPREG_ADDR(f, n) ((char *) &(f)->fpregs[(n) * 3])
360 /* Fill GDB's register array with the floating-point register values in
364 supply_fpregset (elf_fpregset_t
*fpregsetp
)
368 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 8; regi
++)
369 supply_register (regi
, FPREG_ADDR (fpregsetp
, regi
- FP0_REGNUM
));
370 supply_register (M68K_FPC_REGNUM
, (char *) &fpregsetp
->fpcntl
[0]);
371 supply_register (M68K_FPS_REGNUM
, (char *) &fpregsetp
->fpcntl
[1]);
372 supply_register (M68K_FPI_REGNUM
, (char *) &fpregsetp
->fpcntl
[2]);
375 /* Fill register REGNO (if it is a floating-point register) in
376 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
377 do this for all registers. */
380 fill_fpregset (elf_fpregset_t
*fpregsetp
, int regno
)
384 /* Fill in the floating-point registers. */
385 for (i
= FP0_REGNUM
; i
< FP0_REGNUM
+ 8; i
++)
386 if (regno
== -1 || regno
== i
)
387 regcache_collect (i
, FPREG_ADDR (fpregsetp
, i
- FP0_REGNUM
));
389 /* Fill in the floating-point control registers. */
390 for (i
= M68K_FPC_REGNUM
; i
<= M68K_FPI_REGNUM
; i
++)
391 if (regno
== -1 || regno
== i
)
392 regcache_collect (i
, (char *) &fpregsetp
->fpcntl
[i
- M68K_FPC_REGNUM
]);
395 #ifdef HAVE_PTRACE_GETREGS
397 /* Fetch all floating-point registers from process/thread TID and store
398 thier values in GDB's register array. */
401 fetch_fpregs (int tid
)
403 elf_fpregset_t fpregs
;
405 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
406 perror_with_name ("Couldn't get floating point status");
408 supply_fpregset (&fpregs
);
411 /* Store all valid floating-point registers in GDB's register array
412 into the process/thread specified by TID. */
415 store_fpregs (int tid
, int regno
)
417 elf_fpregset_t fpregs
;
419 if (ptrace (PTRACE_GETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
420 perror_with_name ("Couldn't get floating point status");
422 fill_fpregset (&fpregs
, regno
);
424 if (ptrace (PTRACE_SETFPREGS
, tid
, 0, (int) &fpregs
) < 0)
425 perror_with_name ("Couldn't write floating point status");
430 static void fetch_fpregs (int tid
) {}
431 static void store_fpregs (int tid
, int regno
) {}
437 /* Transferring arbitrary registers between GDB and inferior. */
439 /* Fetch register REGNO from the child process. If REGNO is -1, do
440 this for all registers (including the floating point and SSE
444 fetch_inferior_registers (int regno
)
448 /* Use the old method of peeking around in `struct user' if the
449 GETREGS request isn't available. */
450 if (! have_ptrace_getregs
)
452 old_fetch_inferior_registers (regno
);
456 /* GNU/Linux LWP ID's are process ID's. */
457 tid
= TIDGET (inferior_ptid
);
459 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
461 /* Use the PTRACE_GETFPXREGS request whenever possible, since it
462 transfers more registers in one system call, and we'll cache the
463 results. But remember that fetch_fpxregs can fail, and return
469 /* The call above might reset `have_ptrace_getregs'. */
470 if (! have_ptrace_getregs
)
472 old_fetch_inferior_registers (-1);
480 if (getregs_supplies (regno
))
486 if (getfpregs_supplies (regno
))
492 internal_error (__FILE__
, __LINE__
,
493 "Got request for bad register number %d.", regno
);
496 /* Store register REGNO back into the child process. If REGNO is -1,
497 do this for all registers (including the floating point and SSE
500 store_inferior_registers (int regno
)
504 /* Use the old method of poking around in `struct user' if the
505 SETREGS request isn't available. */
506 if (! have_ptrace_getregs
)
508 old_store_inferior_registers (regno
);
512 /* GNU/Linux LWP ID's are process ID's. */
513 tid
= TIDGET (inferior_ptid
);
515 tid
= PIDGET (inferior_ptid
); /* Not a threaded program. */
517 /* Use the PTRACE_SETFPREGS requests whenever possible, since it
518 transfers more registers in one system call. But remember that
519 store_fpregs can fail, and return zero. */
522 store_regs (tid
, regno
);
523 store_fpregs (tid
, regno
);
527 if (getregs_supplies (regno
))
529 store_regs (tid
, regno
);
533 if (getfpregs_supplies (regno
))
535 store_fpregs (tid
, regno
);
539 internal_error (__FILE__
, __LINE__
,
540 "Got request to store bad register number %d.", regno
);
543 /* Interpreting register set info found in core files. */
545 /* Provide registers to GDB from a core file.
547 (We can't use the generic version of this function in
548 core-regset.c, because we need to use elf_gregset_t instead of
551 CORE_REG_SECT points to an array of bytes, which are the contents
552 of a `note' from a core file which BFD thinks might contain
553 register contents. CORE_REG_SIZE is its size.
555 WHICH says which register set corelow suspects this is:
556 0 --- the general-purpose register set, in elf_gregset_t format
557 2 --- the floating-point register set, in elf_fpregset_t format
559 REG_ADDR isn't used on GNU/Linux. */
562 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
563 int which
, CORE_ADDR reg_addr
)
565 elf_gregset_t gregset
;
566 elf_fpregset_t fpregset
;
571 if (core_reg_size
!= sizeof (gregset
))
572 warning ("Wrong size gregset in core file.");
575 memcpy (&gregset
, core_reg_sect
, sizeof (gregset
));
576 supply_gregset (&gregset
);
581 if (core_reg_size
!= sizeof (fpregset
))
582 warning ("Wrong size fpregset in core file.");
585 memcpy (&fpregset
, core_reg_sect
, sizeof (fpregset
));
586 supply_fpregset (&fpregset
);
591 /* We've covered all the kinds of registers we know about here,
592 so this must be something we wouldn't know what to do with
593 anyway. Just ignore it. */
602 return (sizeof (struct user
));
605 /* Register that we are able to handle GNU/Linux ELF core file
608 static struct core_fns linux_elf_core_fns
=
610 bfd_target_elf_flavour
, /* core_flavour */
611 default_check_format
, /* check_format */
612 default_core_sniffer
, /* core_sniffer */
613 fetch_core_registers
, /* core_read_registers */
618 _initialize_m68k_linux_nat (void)
620 add_core_fns (&linux_elf_core_fns
);