GDB (xrefs)
/tmp/gdb-7.10/gdb/amd64bsd-nat.c
Go to the documentation of this file.
1 /* Native-dependent code for AMD64 BSD's.
2 
3  Copyright (C) 2003-2015 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 "inferior.h"
22 #include "regcache.h"
23 #include "target.h"
24 
25 /* We include <signal.h> to make sure `struct fxsave64' is defined on
26  NetBSD, since NetBSD's <machine/reg.h> needs it. */
27 #include <signal.h>
28 #include <sys/types.h>
29 #include <sys/ptrace.h>
30 #include <machine/reg.h>
31 
32 #include "amd64-tdep.h"
33 #include "amd64-nat.h"
34 #include "amd64bsd-nat.h"
35 #include "inf-ptrace.h"
36 
37 
38 #ifdef PT_GETXSTATE_INFO
39 size_t amd64bsd_xsave_len;
40 #endif
41 
42 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
43  for all registers (including the floating-point registers). */
44 
45 static void
47  struct regcache *regcache, int regnum)
48 {
49  struct gdbarch *gdbarch = get_regcache_arch (regcache);
50 
51  if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
52  {
53  struct reg regs;
54 
55  if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
56  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
57  perror_with_name (_("Couldn't get registers"));
58 
59  amd64_supply_native_gregset (regcache, &regs, -1);
60  if (regnum != -1)
61  return;
62  }
63 
64  if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
65  {
66  struct fpreg fpregs;
67 #ifdef PT_GETXSTATE_INFO
68  char *xstateregs;
69 
70  if (amd64bsd_xsave_len != 0)
71  {
72  xstateregs = alloca (amd64bsd_xsave_len);
73  if (ptrace (PT_GETXSTATE, ptid_get_pid (inferior_ptid),
74  (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
75  perror_with_name (_("Couldn't get extended state status"));
76 
77  amd64_supply_xsave (regcache, -1, xstateregs);
78  return;
79  }
80 #endif
81 
82  if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
83  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
84  perror_with_name (_("Couldn't get floating point status"));
85 
86  amd64_supply_fxsave (regcache, -1, &fpregs);
87  }
88 }
89 
90 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
91  this for all registers (including the floating-point registers). */
92 
93 static void
95  struct regcache *regcache, int regnum)
96 {
97  struct gdbarch *gdbarch = get_regcache_arch (regcache);
98 
99  if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
100  {
101  struct reg regs;
102 
103  if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
104  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
105  perror_with_name (_("Couldn't get registers"));
106 
107  amd64_collect_native_gregset (regcache, &regs, regnum);
108 
109  if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid),
110  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
111  perror_with_name (_("Couldn't write registers"));
112 
113  if (regnum != -1)
114  return;
115  }
116 
117  if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
118  {
119  struct fpreg fpregs;
120 #ifdef PT_GETXSTATE_INFO
121  char *xstateregs;
122 
123  if (amd64bsd_xsave_len != 0)
124  {
125  xstateregs = alloca (amd64bsd_xsave_len);
126  if (ptrace (PT_GETXSTATE, ptid_get_pid (inferior_ptid),
127  (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
128  perror_with_name (_("Couldn't get extended state status"));
129 
130  amd64_collect_xsave (regcache, regnum, xstateregs, 0);
131 
132  if (ptrace (PT_SETXSTATE, ptid_get_pid (inferior_ptid),
133  (PTRACE_TYPE_ARG3) xstateregs, amd64bsd_xsave_len) == -1)
134  perror_with_name (_("Couldn't write extended state status"));
135  return;
136  }
137 #endif
138 
139  if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
140  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
141  perror_with_name (_("Couldn't get floating point status"));
142 
143  amd64_collect_fxsave (regcache, regnum, &fpregs);
144 
145  if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid),
146  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
147  perror_with_name (_("Couldn't write floating point status"));
148  }
149 }
150 
151 /* Create a prototype *BSD/amd64 target. The client can override it
152  with local methods. */
153 
154 struct target_ops *
156 {
157  struct target_ops *t;
158 
159  t = inf_ptrace_target ();
162  return t;
163 }
164 
165 
166 /* Support for debug registers. */
167 
168 #ifdef HAVE_PT_GETDBREGS
169 
170 static unsigned long
171 amd64bsd_dr_get (ptid_t ptid, int regnum)
172 {
173  struct dbreg dbregs;
174 
175  if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
176  (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
177  perror_with_name (_("Couldn't read debug registers"));
178 
179  return DBREG_DRX ((&dbregs), regnum);
180 }
181 
182 static void
183 amd64bsd_dr_set (int regnum, unsigned long value)
184 {
185  struct dbreg dbregs;
186 
187  if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
188  (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
189  perror_with_name (_("Couldn't get debug registers"));
190 
191  /* For some mysterious reason, some of the reserved bits in the
192  debug control register get set. Mask these off, otherwise the
193  ptrace call below will fail. */
194  DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00);
195 
196  DBREG_DRX ((&dbregs), regnum) = value;
197 
198  if (ptrace (PT_SETDBREGS, ptid_get_pid (inferior_ptid),
199  (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
200  perror_with_name (_("Couldn't write debug registers"));
201 }
202 
203 void
204 amd64bsd_dr_set_control (unsigned long control)
205 {
206  amd64bsd_dr_set (7, control);
207 }
208 
209 void
210 amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr)
211 {
212  gdb_assert (regnum >= 0 && regnum <= 4);
213 
214  amd64bsd_dr_set (regnum, addr);
215 }
216 
217 CORE_ADDR
218 amd64bsd_dr_get_addr (int regnum)
219 {
220  return amd64bsd_dr_get (inferior_ptid, regnum);
221 }
222 
223 unsigned long
225 {
226  return amd64bsd_dr_get (inferior_ptid, 6);
227 }
228 
229 unsigned long
231 {
232  return amd64bsd_dr_get (inferior_ptid, 7);
233 }
234 
235 #endif /* PT_GETDBREGS */
bfd_vma CORE_ADDR
Definition: common-types.h:41
struct gdbarch * get_regcache_arch(const struct regcache *regcache)
Definition: regcache.c:297
void amd64_collect_native_gregset(const struct regcache *regcache, void *gregs, int regnum)
Definition: amd64-nat.c:119
void amd64bsd_dr_set_addr(int regnum, CORE_ADDR addr)
#define _(String)
Definition: gdb_locale.h:40
struct target_ops * inf_ptrace_target(void)
Definition: inf-ptrace.c:668
struct target_ops * amd64bsd_target(void)
Definition: amd64bsd-nat.c:155
PTRACE_TYPE_RET ptrace()
Definition: ptid.h:35
size_t amd64bsd_xsave_len
void amd64_collect_fxsave(const struct regcache *regcache, int regnum, void *fxsave)
Definition: amd64-tdep.c:3224
void amd64_supply_native_gregset(struct regcache *regcache, const void *gregs, int regnum)
Definition: amd64-nat.c:88
void amd64_supply_fxsave(struct regcache *regcache, int regnum, const void *fxsave)
Definition: amd64-tdep.c:3173
void amd64_supply_xsave(struct regcache *regcache, int regnum, const void *xsave)
Definition: amd64-tdep.c:3196
void amd64bsd_dr_set_control(unsigned long control)
unsigned long amd64bsd_dr_get_status(void)
#define gdb_assert(expr)
Definition: gdb_assert.h:33
unsigned long amd64bsd_dr_get_control(void)
Definition: regdef.h:22
int ptid_get_pid(ptid_t ptid)
Definition: ptid.c:52
void(* to_fetch_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_IGNORE()
Definition: target.h:472
void void void void void void void void void perror_with_name(const char *string) ATTRIBUTE_NORETURN
Definition: utils.c:979
ptid_t inferior_ptid
Definition: infcmd.c:124
int amd64_native_gregset_supplies_p(struct gdbarch *gdbarch, int regnum)
Definition: amd64-nat.c:78
static void amd64bsd_fetch_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
Definition: amd64bsd-nat.c:46
CORE_ADDR amd64bsd_dr_get_addr(int regnum)
static void amd64bsd_store_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
Definition: amd64bsd-nat.c:94
void amd64_collect_xsave(const struct regcache *regcache, int regnum, void *xsave, int gcore)
Definition: amd64-tdep.c:3245
#define PTRACE_TYPE_ARG3
Definition: config.h:658
void(* to_store_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_NORETURN(noprocess())
Definition: target.h:474