1 /* Native-dependent code for AMD64 BSD's.
2
3 Copyright (C) 2003-2013 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 "gdb_assert.h"
28 #include <signal.h>
29 #include <sys/types.h>
30 #include <sys/ptrace.h>
31 #include <machine/reg.h>
32
33 #include "amd64-tdep.h"
34 #include "amd64-nat.h"
35 #include "amd64bsd-nat.h"
36 #include "inf-ptrace.h"
37
38
39 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
40 for all registers (including the floating-point registers). */
41
42 static void
amd64bsd_fetch_inferior_registers(struct target_ops * ops,struct regcache * regcache,int regnum)43 amd64bsd_fetch_inferior_registers (struct target_ops *ops,
44 struct regcache *regcache, int regnum)
45 {
46 struct gdbarch *gdbarch = get_regcache_arch (regcache);
47
48 if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
49 {
50 struct reg regs;
51
52 if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
53 (PTRACE_TYPE_ARG3) ®s, 0) == -1)
54 perror_with_name (_("Couldn't get registers"));
55
56 amd64_supply_native_gregset (regcache, ®s, -1);
57 if (regnum != -1)
58 return;
59 }
60
61 if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
62 {
63 struct fpreg fpregs;
64
65 if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
66 (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
67 perror_with_name (_("Couldn't get floating point status"));
68
69 amd64_supply_fxsave (regcache, -1, &fpregs);
70 }
71 }
72
73 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
74 this for all registers (including the floating-point registers). */
75
76 static void
amd64bsd_store_inferior_registers(struct target_ops * ops,struct regcache * regcache,int regnum)77 amd64bsd_store_inferior_registers (struct target_ops *ops,
78 struct regcache *regcache, int regnum)
79 {
80 struct gdbarch *gdbarch = get_regcache_arch (regcache);
81
82 if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
83 {
84 struct reg regs;
85
86 if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
87 (PTRACE_TYPE_ARG3) ®s, 0) == -1)
88 perror_with_name (_("Couldn't get registers"));
89
90 amd64_collect_native_gregset (regcache, ®s, regnum);
91
92 if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
93 (PTRACE_TYPE_ARG3) ®s, 0) == -1)
94 perror_with_name (_("Couldn't write registers"));
95
96 if (regnum != -1)
97 return;
98 }
99
100 if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
101 {
102 struct fpreg fpregs;
103
104 if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
105 (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
106 perror_with_name (_("Couldn't get floating point status"));
107
108 amd64_collect_fxsave (regcache, regnum, &fpregs);
109
110 if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
111 (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
112 perror_with_name (_("Couldn't write floating point status"));
113 }
114 }
115
116 /* Create a prototype *BSD/amd64 target. The client can override it
117 with local methods. */
118
119 struct target_ops *
amd64bsd_target(void)120 amd64bsd_target (void)
121 {
122 struct target_ops *t;
123
124 t = inf_ptrace_target ();
125 t->to_fetch_registers = amd64bsd_fetch_inferior_registers;
126 t->to_store_registers = amd64bsd_store_inferior_registers;
127 return t;
128 }
129
130
131 /* Support for debug registers. */
132
133 #ifdef HAVE_PT_GETDBREGS
134
135 static unsigned long
amd64bsd_dr_get(ptid_t ptid,int regnum)136 amd64bsd_dr_get (ptid_t ptid, int regnum)
137 {
138 struct dbreg dbregs;
139
140 if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
141 (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
142 perror_with_name (_("Couldn't read debug registers"));
143
144 return DBREG_DRX ((&dbregs), regnum);
145 }
146
147 static void
amd64bsd_dr_set(int regnum,unsigned long value)148 amd64bsd_dr_set (int regnum, unsigned long value)
149 {
150 struct dbreg dbregs;
151
152 if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
153 (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
154 perror_with_name (_("Couldn't get debug registers"));
155
156 /* For some mysterious reason, some of the reserved bits in the
157 debug control register get set. Mask these off, otherwise the
158 ptrace call below will fail. */
159 DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00);
160
161 DBREG_DRX ((&dbregs), regnum) = value;
162
163 if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
164 (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
165 perror_with_name (_("Couldn't write debug registers"));
166 }
167
168 void
amd64bsd_dr_set_control(unsigned long control)169 amd64bsd_dr_set_control (unsigned long control)
170 {
171 amd64bsd_dr_set (7, control);
172 }
173
174 void
amd64bsd_dr_set_addr(int regnum,CORE_ADDR addr)175 amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr)
176 {
177 gdb_assert (regnum >= 0 && regnum <= 4);
178
179 amd64bsd_dr_set (regnum, addr);
180 }
181
182 CORE_ADDR
amd64bsd_dr_get_addr(int regnum)183 amd64bsd_dr_get_addr (int regnum)
184 {
185 return amd64bsd_dr_get (inferior_ptid, regnum);
186 }
187
188 unsigned long
amd64bsd_dr_get_status(void)189 amd64bsd_dr_get_status (void)
190 {
191 return amd64bsd_dr_get (inferior_ptid, 6);
192 }
193
194 unsigned long
amd64bsd_dr_get_control(void)195 amd64bsd_dr_get_control (void)
196 {
197 return amd64bsd_dr_get (inferior_ptid, 7);
198 }
199
200 #endif /* PT_GETDBREGS */
201