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[gdb.git] / gdb / i386v4-nat.c
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1 /* Native-dependent code for Unix SVR4 running on i386's.
3 Copyright (C) 1988, 1989, 1991, 1992, 1996, 1997, 1998, 1999, 2000, 2001,
4 2002, 2004, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
21 #include "defs.h"
22 #include "value.h"
23 #include "inferior.h"
24 #include "regcache.h"
26 #ifdef HAVE_SYS_REG_H
27 #include <sys/reg.h>
28 #endif
30 #include "i386-tdep.h"
31 #include "i387-tdep.h"
33 #ifdef HAVE_SYS_PROCFS_H
35 #include <sys/procfs.h>
37 /* We must not compile this code for 64-bit Solaris x86. */
38 #if !defined (PR_MODEL_NATIVE) || (PR_MODEL_NATIVE == PR_MODEL_ILP32)
40 #include "gregset.h"
42 /* The `/proc' interface divides the target machine's register set up
43 into two different sets, the general purpose register set (gregset)
44 and the floating-point register set (fpregset). For each set,
45 there is an ioctl to get the current register set and another ioctl
46 to set the current values.
48 The actual structure passed through the ioctl interface is, of
49 course, naturally machine dependent, and is different for each set
50 of registers. For the i386 for example, the general-purpose
51 register set is typically defined by:
53 typedef int gregset_t[19]; (in <sys/regset.h>)
55 #define GS 0 (in <sys/reg.h>)
56 #define FS 1
57 ...
58 #define UESP 17
59 #define SS 18
61 and the floating-point set by:
63 typedef struct fpregset {
64 union {
65 struct fpchip_state // fp extension state //
67 int state[27]; // 287/387 saved state //
68 int status; // status word saved at //
69 // exception //
70 } fpchip_state;
71 struct fp_emul_space // for emulators //
73 char fp_emul[246];
74 char fp_epad[2];
75 } fp_emul_space;
76 int f_fpregs[62]; // union of the above //
77 } fp_reg_set;
78 long f_wregs[33]; // saved weitek state //
79 } fpregset_t;
81 Incidentally fpchip_state contains the FPU state in the same format
82 as used by the "fsave" instruction, and that's the only thing we
83 support here. I don't know how the emulator stores it state. The
84 Weitek stuff definitely isn't supported.
86 The routines defined here, provide the packing and unpacking of
87 gregset_t and fpregset_t formatted data. */
89 #ifdef HAVE_GREGSET_T
91 /* Mapping between the general-purpose registers in `/proc'
92 format and GDB's register array layout. */
93 static int regmap[] =
95 EAX, ECX, EDX, EBX,
96 UESP, EBP, ESI, EDI,
97 EIP, EFL, CS, SS,
98 DS, ES, FS, GS
101 /* Fill GDB's register array with the general-purpose register values
102 in *GREGSETP. */
104 void
105 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
107 const greg_t *regp = (const greg_t *) gregsetp;
108 int regnum;
110 for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
111 regcache_raw_supply (regcache, regnum, regp + regmap[regnum]);
114 /* Fill register REGNUM (if it is a general-purpose register) in
115 *GREGSETPS with the value in GDB's register array. If REGNUM is -1,
116 do this for all registers. */
118 void
119 fill_gregset (const struct regcache *regcache,
120 gregset_t *gregsetp, int regnum)
122 greg_t *regp = (greg_t *) gregsetp;
123 int i;
125 for (i = 0; i < I386_NUM_GREGS; i++)
126 if (regnum == -1 || regnum == i)
127 regcache_raw_collect (regcache, i, regp + regmap[i]);
130 #endif /* HAVE_GREGSET_T */
132 #ifdef HAVE_FPREGSET_T
134 /* Fill GDB's register array with the floating-point register values in
135 *FPREGSETP. */
137 void
138 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
140 if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0)
141 return;
143 i387_supply_fsave (regcache, -1, fpregsetp);
146 /* Fill register REGNO (if it is a floating-point register) in
147 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
148 do this for all registers. */
150 void
151 fill_fpregset (const struct regcache *regcache,
152 fpregset_t *fpregsetp, int regno)
154 if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0)
155 return;
157 i387_collect_fsave (regcache, regno, fpregsetp);
160 #endif /* HAVE_FPREGSET_T */
162 #endif /* not 64-bit. */
164 #endif /* HAVE_SYS_PROCFS_H */