GDB (xrefs)
/tmp/gdb-7.10/gdb/i386v4-nat.c
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1 /* Native-dependent code for Unix SVR4 running on i386's.
2 
3  Copyright (C) 1988-2015 Free Software Foundation, Inc.
4 
5  This file is part of GDB.
6 
7  This program is free software; you can redistribute it and/or modify
8  it under the terms of the GNU General Public License as published by
9  the Free Software Foundation; either version 3 of the License, or
10  (at your option) any later version.
11 
12  This program is distributed in the hope that it will be useful,
13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  GNU General Public License for more details.
16 
17  You should have received a copy of the GNU General Public License
18  along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 
20 #include "defs.h"
21 #include "value.h"
22 #include "inferior.h"
23 #include "regcache.h"
24 
25 #ifdef HAVE_SYS_REG_H
26 #include <sys/reg.h>
27 #endif
28 
29 #include "i386-tdep.h"
30 #include "i387-tdep.h"
31 
32 #ifdef HAVE_SYS_PROCFS_H
33 
34 #include <sys/procfs.h>
35 
36 /* We must not compile this code for 64-bit Solaris x86. */
37 #if !defined (PR_MODEL_NATIVE) || (PR_MODEL_NATIVE == PR_MODEL_ILP32)
38 
39 #include "gregset.h"
40 
41 /* The `/proc' interface divides the target machine's register set up
42  into two different sets, the general purpose register set (gregset)
43  and the floating-point register set (fpregset). For each set,
44  there is an ioctl to get the current register set and another ioctl
45  to set the current values.
46 
47  The actual structure passed through the ioctl interface is, of
48  course, naturally machine dependent, and is different for each set
49  of registers. For the i386 for example, the general-purpose
50  register set is typically defined by:
51 
52  typedef int gregset_t[19]; (in <sys/regset.h>)
53 
54  #define GS 0 (in <sys/reg.h>)
55  #define FS 1
56  ...
57  #define UESP 17
58  #define SS 18
59 
60  and the floating-point set by:
61 
62  typedef struct fpregset {
63  union {
64  struct fpchip_state // fp extension state //
65  {
66  int state[27]; // 287/387 saved state //
67  int status; // status word saved at //
68  // exception //
69  } fpchip_state;
70  struct fp_emul_space // for emulators //
71  {
72  char fp_emul[246];
73  char fp_epad[2];
74  } fp_emul_space;
75  int f_fpregs[62]; // union of the above //
76  } fp_reg_set;
77  long f_wregs[33]; // saved weitek state //
78  } fpregset_t;
79 
80  Incidentally fpchip_state contains the FPU state in the same format
81  as used by the "fsave" instruction, and that's the only thing we
82  support here. I don't know how the emulator stores it state. The
83  Weitek stuff definitely isn't supported.
84 
85  The routines defined here, provide the packing and unpacking of
86  gregset_t and fpregset_t formatted data. */
87 
88 #ifdef HAVE_GREGSET_T
89 
90 /* Mapping between the general-purpose registers in `/proc'
91  format and GDB's register array layout. */
92 static int regmap[] =
93 {
94  EAX, ECX, EDX, EBX,
95  UESP, EBP, ESI, EDI,
96  EIP, EFL, CS, SS,
97  DS, ES, FS, GS
98 };
99 
100 /* Fill GDB's register array with the general-purpose register values
101  in *GREGSETP. */
102 
103 void
104 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
105 {
106  const greg_t *regp = (const greg_t *) gregsetp;
107  int regnum;
108 
109  for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
110  regcache_raw_supply (regcache, regnum, regp + regmap[regnum]);
111 }
112 
113 /* Fill register REGNUM (if it is a general-purpose register) in
114  *GREGSETPS with the value in GDB's register array. If REGNUM is -1,
115  do this for all registers. */
116 
117 void
118 fill_gregset (const struct regcache *regcache,
119  gregset_t *gregsetp, int regnum)
120 {
121  greg_t *regp = (greg_t *) gregsetp;
122  int i;
123 
124  for (i = 0; i < I386_NUM_GREGS; i++)
125  if (regnum == -1 || regnum == i)
126  regcache_raw_collect (regcache, i, regp + regmap[i]);
127 }
128 
129 #endif /* HAVE_GREGSET_T */
130 
131 #ifdef HAVE_FPREGSET_T
132 
133 /* Fill GDB's register array with the floating-point register values in
134  *FPREGSETP. */
135 
136 void
137 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
138 {
139  if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0)
140  return;
141 
142  i387_supply_fsave (regcache, -1, fpregsetp);
143 }
144 
145 /* Fill register REGNO (if it is a floating-point register) in
146  *FPREGSETP with the value in GDB's register array. If REGNO is -1,
147  do this for all registers. */
148 
149 void
150 fill_fpregset (const struct regcache *regcache,
151  fpregset_t *fpregsetp, int regno)
152 {
153  if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0)
154  return;
155 
156  i387_collect_fsave (regcache, regno, fpregsetp);
157 }
158 
159 #endif /* HAVE_FPREGSET_T */
160 
161 #endif /* not 64-bit. */
162 
163 #endif /* HAVE_SYS_PROCFS_H */
void i387_collect_fsave(const struct regcache *regcache, int regnum, void *fsave)
Definition: i387-tdep.c:502
#define I386_NUM_GREGS
Definition: i386-tdep.h:320
void fill_gregset(const struct regcache *regcache, gdb_gregset_t *gregsetp, int regno)
struct gdbarch * get_regcache_arch(const struct regcache *regcache)
Definition: regcache.c:297
void i387_supply_fsave(struct regcache *regcache, int regnum, const void *fsave)
Definition: i387-tdep.c:447
static int regmap[]
void fill_fpregset(const struct regcache *regcache, gdb_fpregset_t *fpregsetp, int regno)
void supply_gregset(struct regcache *regcache, const gdb_gregset_t *gregsetp)
int regnum
Definition: aarch64-tdep.c:69
Definition: regdef.h:22
int gdbarch_fp0_regnum(struct gdbarch *gdbarch)
Definition: gdbarch.c:2032
void regcache_raw_supply(struct regcache *regcache, int regnum, const void *buf)
Definition: regcache.c:1041
void regcache_raw_collect(const struct regcache *regcache, int regnum, void *buf)
Definition: regcache.c:1071
struct fpreg fpregset_t
Definition: alphabsd-nat.c:41
void supply_fpregset(struct regcache *regcache, const gdb_fpregset_t *fpregsetp)