1 /* Native-dependent code for X86 BSD's.
3 Copyright (C) 2003-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
22 #include "gdbthread.h"
24 /* We include <signal.h> to make sure `struct fxsave64' is defined on
25 NetBSD, since NetBSD's <machine/reg.h> needs it. */
27 #include <sys/types.h>
28 #include <sys/ptrace.h>
29 #include <machine/reg.h>
32 #include "x86-bsd-nat.h"
33 #include "inf-ptrace.h"
36 #ifdef PT_GETXSTATE_INFO
37 size_t x86bsd_xsave_len
;
40 /* Support for debug registers. */
42 #ifdef HAVE_PT_GETDBREGS
43 static void (*super_mourn_inferior
) (struct target_ops
*ops
);
45 /* Implement the "to_mourn_inferior" target_ops method. */
48 x86bsd_mourn_inferior (struct target_ops
*ops
)
51 super_mourn_inferior (ops
);
54 /* Helper macro to access debug register X. FreeBSD/amd64 and modern
55 versions of FreeBSD/i386 provide this macro in system headers. Define
56 a local version for systems that do not provide it. */
59 #define DBREG_DRX(d, x) ((d)->dr[x])
61 #define DBREG_DRX(d, x) ((&d->dr0)[x])
66 x86bsd_dr_get (ptid_t ptid
, int regnum
)
70 if (ptrace (PT_GETDBREGS
, get_ptrace_pid (inferior_ptid
),
71 (PTRACE_TYPE_ARG3
) &dbregs
, 0) == -1)
72 perror_with_name (_("Couldn't read debug registers"));
74 return DBREG_DRX ((&dbregs
), regnum
);
78 x86bsd_dr_set (int regnum
, unsigned long value
)
80 struct thread_info
*thread
;
83 if (ptrace (PT_GETDBREGS
, get_ptrace_pid (inferior_ptid
),
84 (PTRACE_TYPE_ARG3
) &dbregs
, 0) == -1)
85 perror_with_name (_("Couldn't get debug registers"));
87 /* For some mysterious reason, some of the reserved bits in the
88 debug control register get set. Mask these off, otherwise the
89 ptrace call below will fail. */
90 DBREG_DRX ((&dbregs
), 7) &= ~(0xffffffff0000fc00);
92 DBREG_DRX ((&dbregs
), regnum
) = value
;
94 ALL_NON_EXITED_THREADS (thread
)
95 if (thread
->inf
== current_inferior ())
97 if (ptrace (PT_SETDBREGS
, get_ptrace_pid (thread
->ptid
),
98 (PTRACE_TYPE_ARG3
) &dbregs
, 0) == -1)
99 perror_with_name (_("Couldn't write debug registers"));
104 x86bsd_dr_set_control (unsigned long control
)
106 x86bsd_dr_set (7, control
);
110 x86bsd_dr_set_addr (int regnum
, CORE_ADDR addr
)
112 gdb_assert (regnum
>= 0 && regnum
<= 4);
114 x86bsd_dr_set (regnum
, addr
);
118 x86bsd_dr_get_addr (int regnum
)
120 return x86bsd_dr_get (inferior_ptid
, regnum
);
124 x86bsd_dr_get_status (void)
126 return x86bsd_dr_get (inferior_ptid
, 6);
130 x86bsd_dr_get_control (void)
132 return x86bsd_dr_get (inferior_ptid
, 7);
135 #endif /* PT_GETDBREGS */
137 /* Create a prototype *BSD/x86 target. The client can override it
138 with local methods. */
143 struct target_ops
*t
;
145 t
= inf_ptrace_target ();
147 #ifdef HAVE_PT_GETDBREGS
148 x86_use_watchpoints (t
);
150 x86_dr_low
.set_control
= x86bsd_dr_set_control
;
151 x86_dr_low
.set_addr
= x86bsd_dr_set_addr
;
152 x86_dr_low
.get_addr
= x86bsd_dr_get_addr
;
153 x86_dr_low
.get_status
= x86bsd_dr_get_status
;
154 x86_dr_low
.get_control
= x86bsd_dr_get_control
;
155 x86_set_debug_register_length (sizeof (void *));
156 super_mourn_inferior
= t
->to_mourn_inferior
;
157 t
->to_mourn_inferior
= x86bsd_mourn_inferior
;
158 #endif /* HAVE_PT_GETDBREGS */
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