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 /* Not all versions of FreeBSD/i386 that support the debug registers
57 #define DBREG_DRX(d, x) ((&d->dr0)[x])
61 x86bsd_dr_get (ptid_t ptid, int regnum)
65 if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
66 (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
67 perror_with_name (_("Couldn't read debug registers"));
69 return DBREG_DRX ((&dbregs), regnum);
73 x86bsd_dr_set (int regnum, unsigned long value)
75 struct thread_info *thread;
78 if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
79 (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
80 perror_with_name (_("Couldn't get debug registers"));
82 /* For some mysterious reason, some of the reserved bits in the
83 debug control register get set. Mask these off, otherwise the
84 ptrace call below will fail. */
85 DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00);
87 DBREG_DRX ((&dbregs), regnum) = value;
89 ALL_NON_EXITED_THREADS (thread)
90 if (thread->inf == current_inferior ())
92 if (ptrace (PT_SETDBREGS, get_ptrace_pid (thread->ptid),
93 (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
94 perror_with_name (_("Couldn't write debug registers"));
99 x86bsd_dr_set_control (unsigned long control)
101 x86bsd_dr_set (7, control);
105 x86bsd_dr_set_addr (int regnum, CORE_ADDR addr)
107 gdb_assert (regnum >= 0 && regnum <= 4);
109 x86bsd_dr_set (regnum, addr);
113 x86bsd_dr_get_addr (int regnum)
115 return x86bsd_dr_get (inferior_ptid, regnum);
119 x86bsd_dr_get_status (void)
121 return x86bsd_dr_get (inferior_ptid, 6);
125 x86bsd_dr_get_control (void)
127 return x86bsd_dr_get (inferior_ptid, 7);
130 #endif /* PT_GETDBREGS */
132 /* Create a prototype *BSD/x86 target. The client can override it
133 with local methods. */
138 struct target_ops *t;
140 t = inf_ptrace_target ();
142 #ifdef HAVE_PT_GETDBREGS
143 x86_use_watchpoints (t);
145 x86_dr_low.set_control = x86bsd_dr_set_control;
146 x86_dr_low.set_addr = x86bsd_dr_set_addr;
147 x86_dr_low.get_addr = x86bsd_dr_get_addr;
148 x86_dr_low.get_status = x86bsd_dr_get_status;
149 x86_dr_low.get_control = x86bsd_dr_get_control;
150 x86_set_debug_register_length (sizeof (void *));
151 super_mourn_inferior = t->to_mourn_inferior;
152 t->to_mourn_inferior = x86bsd_mourn_inferior;
153 #endif /* HAVE_PT_GETDBREGS */