1 /* Native-dependent code for modern i386 BSD's.
2 Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
25 #include "gdb_assert.h"
28 #include <sys/types.h>
29 #include <sys/ptrace.h>
30 #include <machine/reg.h>
31 #include <machine/frame.h>
33 #ifdef HAVE_SYS_PROCFS_H
34 #include <sys/procfs.h>
37 #ifndef HAVE_GREGSET_T
38 typedef struct reg gregset_t
;
41 #ifndef HAVE_FPREGSET_T
42 typedef struct fpreg fpregset_t
;
46 #include "i386-tdep.h"
49 /* In older BSD versions we cannot get at some of the segment
50 registers. FreeBSD for example didn't support the %fs and %gs
51 registers until the 3.0 release. We have autoconf checks for their
52 presence, and deal gracefully with their absence. */
54 /* Registers we shouldn't try to fetch. */
55 #if !defined (CANNOT_FETCH_REGISTER)
56 #define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)
59 /* Registers we shouldn't try to store. */
60 #if !defined (CANNOT_STORE_REGISTER)
61 #define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)
64 /* Offset to the gregset_t location where REG is stored. */
65 #define REG_OFFSET(reg) offsetof (gregset_t, reg)
67 /* At reg_offset[REGNO] you'll find the offset to the gregset_t
68 location where the GDB register REGNO is stored. Unsupported
69 registers are marked with `-1'. */
70 static int reg_offset
[] =
81 REG_OFFSET (r_eflags
),
86 #ifdef HAVE_STRUCT_REG_R_FS
91 #ifdef HAVE_STRUCT_REG_R_GS
98 #define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])
100 /* Macro to determine if a register is fetched with PT_GETREGS. */
101 #define GETREGS_SUPPLIES(regno) \
102 ((0 <= (regno) && (regno) <= 15))
104 #ifdef HAVE_PT_GETXMMREGS
105 /* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
106 so that we try PT_GETXMMREGS the first time around. */
107 static int have_ptrace_xmmregs
= -1;
110 /* Return nonzero if we shouldn't try to fetch register REGNO. */
113 cannot_fetch_register (int regno
)
115 return (reg_offset
[regno
] == -1);
119 /* Transfering the registers between GDB, inferiors and core files. */
121 /* Fill GDB's register array with the general-purpose register values
125 supply_gregset (gregset_t
*gregsetp
)
129 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
131 if (CANNOT_FETCH_REGISTER (i
))
132 supply_register (i
, NULL
);
134 supply_register (i
, REG_ADDR (gregsetp
, i
));
138 /* Fill register REGNO (if it is a general-purpose register) in
139 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
140 do this for all registers. */
143 fill_gregset (gregset_t
*gregsetp
, int regno
)
147 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
148 if ((regno
== -1 || regno
== i
) && ! CANNOT_STORE_REGISTER (i
))
149 regcache_collect (i
, REG_ADDR (gregsetp
, i
));
152 #include "i387-tdep.h"
154 /* Fill GDB's register array with the floating-point register values
158 supply_fpregset (fpregset_t
*fpregsetp
)
160 i387_supply_fsave (current_regcache
, -1, fpregsetp
);
163 /* Fill register REGNO (if it is a floating-point register) in
164 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
165 do this for all registers. */
168 fill_fpregset (fpregset_t
*fpregsetp
, int regno
)
170 i387_fill_fsave ((char *) fpregsetp
, regno
);
173 /* Fetch register REGNO from the inferior. If REGNO is -1, do this
174 for all registers (including the floating point registers). */
177 fetch_inferior_registers (int regno
)
179 if (regno
== -1 || GETREGS_SUPPLIES (regno
))
183 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
184 (PTRACE_ARG3_TYPE
) &gregs
, 0) == -1)
185 perror_with_name ("Couldn't get registers");
187 supply_gregset (&gregs
);
192 if (regno
== -1 || regno
>= FP0_REGNUM
)
195 #ifdef HAVE_PT_GETXMMREGS
198 if (have_ptrace_xmmregs
!= 0
199 && ptrace(PT_GETXMMREGS
, PIDGET (inferior_ptid
),
200 (PTRACE_ARG3_TYPE
) xmmregs
, 0) == 0)
202 have_ptrace_xmmregs
= 1;
203 i387_supply_fxsave (current_regcache
, -1, xmmregs
);
207 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
208 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
209 perror_with_name ("Couldn't get floating point status");
211 i387_supply_fsave (current_regcache
, -1, &fpregs
);
214 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
215 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
216 perror_with_name ("Couldn't get floating point status");
218 i387_supply_fsave (current_regcache
, -1, &fpregs
);
223 /* Store register REGNO back into the inferior. If REGNO is -1, do
224 this for all registers (including the floating point registers). */
227 store_inferior_registers (int regno
)
229 if (regno
== -1 || GETREGS_SUPPLIES (regno
))
233 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
234 (PTRACE_ARG3_TYPE
) &gregs
, 0) == -1)
235 perror_with_name ("Couldn't get registers");
237 fill_gregset (&gregs
, regno
);
239 if (ptrace (PT_SETREGS
, PIDGET (inferior_ptid
),
240 (PTRACE_ARG3_TYPE
) &gregs
, 0) == -1)
241 perror_with_name ("Couldn't write registers");
247 if (regno
== -1 || regno
>= FP0_REGNUM
)
250 #ifdef HAVE_PT_GETXMMREGS
253 if (have_ptrace_xmmregs
!= 0
254 && ptrace(PT_GETXMMREGS
, PIDGET (inferior_ptid
),
255 (PTRACE_ARG3_TYPE
) xmmregs
, 0) == 0)
257 have_ptrace_xmmregs
= 1;
259 i387_fill_fxsave (xmmregs
, regno
);
261 if (ptrace (PT_SETXMMREGS
, PIDGET (inferior_ptid
),
262 (PTRACE_ARG3_TYPE
) xmmregs
, 0) == -1)
263 perror_with_name ("Couldn't write XMM registers");
267 have_ptrace_xmmregs
= 0;
269 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
270 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
271 perror_with_name ("Couldn't get floating point status");
273 i387_fill_fsave ((char *) &fpregs
, regno
);
275 if (ptrace (PT_SETFPREGS
, PIDGET (inferior_ptid
),
276 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
277 perror_with_name ("Couldn't write floating point status");
278 #ifdef HAVE_PT_GETXMMREGS
285 /* Support for debug registers. */
287 #ifdef HAVE_PT_GETDBREGS
289 /* Not all versions of FreeBSD/i386 that support the debug registers
292 #define DBREG_DRX(d, x) ((&d->dr0)[x])
296 i386bsd_dr_set (int regnum
, unsigned int value
)
300 if (ptrace (PT_GETDBREGS
, PIDGET (inferior_ptid
),
301 (PTRACE_ARG3_TYPE
) &dbregs
, 0) == -1)
302 perror_with_name ("Couldn't get debug registers");
304 /* For some mysterious reason, some of the reserved bits in the
305 debug control register get set. Mask these off, otherwise the
306 ptrace call below will fail. */
307 DBREG_DRX ((&dbregs
), 7) &= ~(0x0000fc00);
309 DBREG_DRX ((&dbregs
), regnum
) = value
;
311 if (ptrace (PT_SETDBREGS
, PIDGET (inferior_ptid
),
312 (PTRACE_ARG3_TYPE
) &dbregs
, 0) == -1)
313 perror_with_name ("Couldn't write debug registers");
317 i386bsd_dr_set_control (unsigned long control
)
319 i386bsd_dr_set (7, control
);
323 i386bsd_dr_set_addr (int regnum
, CORE_ADDR addr
)
325 gdb_assert (regnum
>= 0 && regnum
<= 4);
327 i386bsd_dr_set (regnum
, addr
);
331 i386bsd_dr_reset_addr (int regnum
)
333 gdb_assert (regnum
>= 0 && regnum
<= 4);
335 i386bsd_dr_set (regnum
, 0);
339 i386bsd_dr_get_status (void)
343 /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
344 ptrace call fails breaks debugging remote targets. The correct
345 way to fix this is to add the hardware breakpoint and watchpoint
346 stuff to the target vector. For now, just return zero if the
347 ptrace call fails. */
348 if (ptrace (PT_GETDBREGS
, PIDGET (inferior_ptid
),
349 (PTRACE_ARG3_TYPE
) & dbregs
, 0) == -1)
351 perror_with_name ("Couldn't read debug registers");
356 return DBREG_DRX ((&dbregs
), 6);
359 #endif /* PT_GETDBREGS */
362 /* Support for the user struct. */
364 /* Return the address register REGNO. BLOCKEND is the value of
365 u.u_ar0, which should point to the registers. */
368 register_u_addr (CORE_ADDR blockend
, int regno
)
370 return (CORE_ADDR
) REG_ADDR (blockend
, regno
);
373 #include <sys/param.h>
374 #include <sys/user.h>
376 /* Return the size of the user struct. */
381 return (sizeof (struct user
));
385 _initialize_i386bsd_nat (void)
389 /* To support the recognition of signal handlers, i386bsd-tdep.c
390 hardcodes some constants. Inclusion of this file means that we
391 are compiling a native debugger, which means that we can use the
392 system header files and sysctl(3) to get at the relevant
395 #if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
396 #define SC_REG_OFFSET i386fbsd4_sc_reg_offset
397 #elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
398 #define SC_REG_OFFSET i386fbsd_sc_reg_offset
399 #elif defined (NetBSD) || defined (__NetBSD_Version__)
400 #define SC_REG_OFFSET i386nbsd_sc_reg_offset
401 #elif defined (OpenBSD)
402 #define SC_REG_OFFSET i386obsd_sc_reg_offset
404 #define SC_REG_OFFSET i386bsd_sc_reg_offset
407 /* We only check the program counter, stack pointer and frame
408 pointer since these members of `struct sigcontext' are essential
409 for providing backtraces. More checks could be added, but would
410 involve adding configure checks for the appropriate structure
411 members, since older BSD's don't provide all of them. */
413 #define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
414 #define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
415 #define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
417 /* Override the default value for the offset of the program counter
418 in the sigcontext structure. */
419 offset
= offsetof (struct sigcontext
, sc_pc
);
421 if (SC_PC_OFFSET
!= offset
)
424 offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
425 Please report this to <bug-gdb@gnu.org>.",
426 offset
, SC_PC_OFFSET
);
429 SC_PC_OFFSET
= offset
;
431 /* Likewise for the stack pointer. */
432 offset
= offsetof (struct sigcontext
, sc_sp
);
434 if (SC_SP_OFFSET
!= offset
)
437 offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
438 Please report this to <bug-gdb@gnu.org>.",
439 offset
, SC_SP_OFFSET
);
442 SC_SP_OFFSET
= offset
;
444 /* And the frame pointer. */
445 offset
= offsetof (struct sigcontext
, sc_fp
);
447 if (SC_FP_OFFSET
!= offset
)
450 offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
451 Please report this to <bug-gdb@gnu.org>.",
452 offset
, SC_FP_OFFSET
);
455 SC_FP_OFFSET
= offset
;
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