1 /* Native-dependent code for modern i386 BSD's.
2 Copyright 2000, 2001, 2002 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 ((char *) 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
)
180 if (regno
== -1 || GETREGS_SUPPLIES (regno
))
184 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
185 (PTRACE_ARG3_TYPE
) &gregs
, 0) == -1)
186 perror_with_name ("Couldn't get registers");
188 supply_gregset (&gregs
);
193 if (regno
== -1 || regno
>= FP0_REGNUM
)
196 #ifdef HAVE_PT_GETXMMREGS
199 if (have_ptrace_xmmregs
!= 0 &&
200 ptrace(PT_GETXMMREGS
, PIDGET (inferior_ptid
),
201 (PTRACE_ARG3_TYPE
) xmmregs
, 0) == 0)
203 have_ptrace_xmmregs
= 1;
204 i387_supply_fxsave (xmmregs
);
208 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
209 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
210 perror_with_name ("Couldn't get floating point status");
212 supply_fpregset (&fpregs
);
215 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
216 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
217 perror_with_name ("Couldn't get floating point status");
219 supply_fpregset (&fpregs
);
224 /* Store register REGNO back into the inferior. If REGNO is -1, do
225 this for all registers (including the floating point registers). */
228 store_inferior_registers (int regno
)
231 if (regno
== -1 || GETREGS_SUPPLIES (regno
))
235 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
236 (PTRACE_ARG3_TYPE
) &gregs
, 0) == -1)
237 perror_with_name ("Couldn't get registers");
239 fill_gregset (&gregs
, regno
);
241 if (ptrace (PT_SETREGS
, PIDGET (inferior_ptid
),
242 (PTRACE_ARG3_TYPE
) &gregs
, 0) == -1)
243 perror_with_name ("Couldn't write registers");
249 if (regno
== -1 || regno
>= FP0_REGNUM
)
252 #ifdef HAVE_PT_GETXMMREGS
255 if (have_ptrace_xmmregs
!= 0 &&
256 ptrace(PT_GETXMMREGS
, PIDGET (inferior_ptid
),
257 (PTRACE_ARG3_TYPE
) xmmregs
, 0) == 0)
259 have_ptrace_xmmregs
= 1;
261 i387_fill_fxsave (xmmregs
, regno
);
263 if (ptrace (PT_SETXMMREGS
, PIDGET (inferior_ptid
),
264 (PTRACE_ARG3_TYPE
) xmmregs
, 0) == -1)
265 perror_with_name ("Couldn't write XMM registers");
269 have_ptrace_xmmregs
= 0;
271 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
272 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
273 perror_with_name ("Couldn't get floating point status");
275 fill_fpregset (&fpregs
, regno
);
277 if (ptrace (PT_SETFPREGS
, PIDGET (inferior_ptid
),
278 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
279 perror_with_name ("Couldn't write floating point status");
280 #ifdef HAVE_PT_GETXMMREGS
287 /* Support for debug registers. */
289 #ifdef HAVE_PT_GETDBREGS
291 /* Not all versions of FreeBSD/i386 that support the debug registers
294 #define DBREG_DRX(d, x) ((&d->dr0)[x])
298 i386bsd_dr_set (int regnum
, unsigned int value
)
302 if (ptrace (PT_GETDBREGS
, PIDGET (inferior_ptid
),
303 (PTRACE_ARG3_TYPE
) &dbregs
, 0) == -1)
304 perror_with_name ("Couldn't get debug registers");
306 /* For some mysterious reason, some of the reserved bits in the
307 debug control register get set. Mask these off, otherwise the
308 ptrace call below will fail. */
309 dbregs
.dr7
&= ~(0x0000fc00);
311 DBREG_DRX ((&dbregs
), regnum
) = value
;
313 if (ptrace (PT_SETDBREGS
, PIDGET (inferior_ptid
),
314 (PTRACE_ARG3_TYPE
) &dbregs
, 0) == -1)
315 perror_with_name ("Couldn't write debug registers");
319 i386bsd_dr_set_control (unsigned long control
)
321 i386bsd_dr_set (7, control
);
325 i386bsd_dr_set_addr (int regnum
, CORE_ADDR addr
)
327 gdb_assert (regnum
>= 0 && regnum
<= 4);
329 i386bsd_dr_set (regnum
, addr
);
333 i386bsd_dr_reset_addr (int regnum
)
335 gdb_assert (regnum
>= 0 && regnum
<= 4);
337 i386bsd_dr_set (regnum
, 0);
341 i386bsd_dr_get_status (void)
345 /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
346 ptrace call fails breaks debugging remote targets. The correct
347 way to fix this is to add the hardware breakpoint and watchpoint
348 stuff to the target vector. For now, just return zero if the
349 ptrace call fails. */
350 if (ptrace (PT_GETDBREGS
, PIDGET (inferior_ptid
),
351 (PTRACE_ARG3_TYPE
) & dbregs
, 0) == -1)
353 perror_with_name ("Couldn't read debug registers");
361 #endif /* PT_GETDBREGS */
364 /* Support for the user struct. */
366 /* Return the address register REGNO. BLOCKEND is the value of
367 u.u_ar0, which should point to the registers. */
370 register_u_addr (CORE_ADDR blockend
, int regno
)
372 return (CORE_ADDR
) REG_ADDR (blockend
, regno
);
375 #include <sys/param.h>
376 #include <sys/user.h>
378 /* Return the size of the user struct. */
383 return (sizeof (struct user
));
387 _initialize_i386bsd_nat (void)
392 /* To support the recognition of signal handlers, i386bsd-tdep.c
393 hardcodes some constants. Inclusion of this file means that we
394 are compiling a native debugger, which means that we can use the
395 system header files and sysctl(3) to get at the relevant
398 #if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
399 extern int i386fbsd4_sc_pc_offset
;
400 extern int i386fbsd4_sc_sp_offset
;
401 #define SC_PC_OFFSET i386fbsd4_sc_pc_offset
402 #define SC_SP_OFFSET i386fbsd4_sc_sp_offset
403 #elif defined (NetBSD) || defined (__NetBSD_Version__) || defined (OpenBSD)
404 extern int i386nbsd_sc_pc_offset
;
405 extern int i386nbsd_sc_sp_offset
;
406 #define SC_PC_OFFSET i386nbsd_sc_pc_offset
407 #define SC_SP_OFFSET i386nbsd_sc_sp_offset
409 extern int i386bsd_sc_pc_offset
;
410 extern int i386bsd_sc_sp_offset
;
411 #define SC_PC_OFFSET i386bsd_sc_pc_offset
412 #define SC_SP_OFFSET i386bsd_sc_sp_offset
415 /* Override the default value for the offset of the program counter
416 in the sigcontext structure. */
417 sc_pc_offset
= offsetof (struct sigcontext
, sc_pc
);
419 if (SC_PC_OFFSET
!= sc_pc_offset
)
422 offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
423 Please report this to <bug-gdb@gnu.org>.",
424 sc_pc_offset
, SC_PC_OFFSET
);
427 SC_PC_OFFSET
= sc_pc_offset
;
429 /* Likewise for the stack pointer. */
430 sc_sp_offset
= offsetof (struct sigcontext
, sc_sp
);
432 if (SC_SP_OFFSET
!= sc_sp_offset
)
435 offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
436 Please report this to <bug-gdb@gnu.org>.",
437 sc_sp_offset
, SC_SP_OFFSET
);
440 SC_SP_OFFSET
= sc_sp_offset
;
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