xref: /dragonfly/contrib/gdb-7/gdb/amd64bsd-nat.c (revision ef5ccd6c)
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) &regs, 0) == -1)
54 	perror_with_name (_("Couldn't get registers"));
55 
56       amd64_supply_native_gregset (regcache, &regs, -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) &regs, 0) == -1)
88         perror_with_name (_("Couldn't get registers"));
89 
90       amd64_collect_native_gregset (regcache, &regs, regnum);
91 
92       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
93 	          (PTRACE_TYPE_ARG3) &regs, 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