1 /* Native-dependent code for X86 BSD's.
3 Copyright (C) 2003-2019 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
44 /* Helper macro to access debug register X. FreeBSD/amd64 and modern
45 versions of FreeBSD/i386 provide this macro in system headers. Define
46 a local version for systems that do not provide it. */
49 #define DBREG_DRX(d, x) ((d)->dr[x])
51 #define DBREG_DRX(d, x) ((&d->dr0)[x])
56 x86bsd_dr_get (ptid_t ptid
, int regnum
)
60 if (ptrace (PT_GETDBREGS
, get_ptrace_pid (inferior_ptid
),
61 (PTRACE_TYPE_ARG3
) &dbregs
, 0) == -1)
62 perror_with_name (_("Couldn't read debug registers"));
64 return DBREG_DRX ((&dbregs
), regnum
);
68 x86bsd_dr_set (int regnum
, unsigned long value
)
72 if (ptrace (PT_GETDBREGS
, get_ptrace_pid (inferior_ptid
),
73 (PTRACE_TYPE_ARG3
) &dbregs
, 0) == -1)
74 perror_with_name (_("Couldn't get debug registers"));
76 /* For some mysterious reason, some of the reserved bits in the
77 debug control register get set. Mask these off, otherwise the
78 ptrace call below will fail. */
79 DBREG_DRX ((&dbregs
), 7) &= ~(0xffffffff0000fc00);
81 DBREG_DRX ((&dbregs
), regnum
) = value
;
83 for (thread_info
*thread
: current_inferior ()->non_exited_threads ())
85 if (ptrace (PT_SETDBREGS
, get_ptrace_pid (thread
->ptid
),
86 (PTRACE_TYPE_ARG3
) &dbregs
, 0) == -1)
87 perror_with_name (_("Couldn't write debug registers"));
92 x86bsd_dr_set_control (unsigned long control
)
94 x86bsd_dr_set (7, control
);
98 x86bsd_dr_set_addr (int regnum
, CORE_ADDR addr
)
100 gdb_assert (regnum
>= 0 && regnum
<= 4);
102 x86bsd_dr_set (regnum
, addr
);
106 x86bsd_dr_get_addr (int regnum
)
108 return x86bsd_dr_get (inferior_ptid
, regnum
);
112 x86bsd_dr_get_status (void)
114 return x86bsd_dr_get (inferior_ptid
, 6);
118 x86bsd_dr_get_control (void)
120 return x86bsd_dr_get (inferior_ptid
, 7);
123 #endif /* PT_GETDBREGS */
126 _initialize_x86_bsd_nat ()
128 #ifdef HAVE_PT_GETDBREGS
129 x86_dr_low
.set_control
= x86bsd_dr_set_control
;
130 x86_dr_low
.set_addr
= x86bsd_dr_set_addr
;
131 x86_dr_low
.get_addr
= x86bsd_dr_get_addr
;
132 x86_dr_low
.get_status
= x86bsd_dr_get_status
;
133 x86_dr_low
.get_control
= x86bsd_dr_get_control
;
134 x86_set_debug_register_length (sizeof (void *));
135 #endif /* HAVE_PT_GETDBREGS */
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