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157 lines
3.9 KiB
C
157 lines
3.9 KiB
C
/* Native-dependent code for X86 BSD's.
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Copyright (C) 2003-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbthread.h"
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/* We include <signal.h> to make sure `struct fxsave64' is defined on
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NetBSD, since NetBSD's <machine/reg.h> needs it. */
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include "x86-nat.h"
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#include "x86-bsd-nat.h"
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#include "inf-ptrace.h"
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#ifdef PT_GETXSTATE_INFO
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size_t x86bsd_xsave_len;
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#endif
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/* Support for debug registers. */
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#ifdef HAVE_PT_GETDBREGS
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static void (*super_mourn_inferior) (struct target_ops *ops);
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/* Implement the "to_mourn_inferior" target_ops method. */
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static void
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x86bsd_mourn_inferior (struct target_ops *ops)
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{
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x86_cleanup_dregs ();
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super_mourn_inferior (ops);
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}
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/* Not all versions of FreeBSD/i386 that support the debug registers
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have this macro. */
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#ifndef DBREG_DRX
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#define DBREG_DRX(d, x) ((&d->dr0)[x])
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#endif
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static unsigned long
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x86bsd_dr_get (ptid_t ptid, int regnum)
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{
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struct dbreg dbregs;
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if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
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(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
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perror_with_name (_("Couldn't read debug registers"));
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return DBREG_DRX ((&dbregs), regnum);
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}
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static void
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x86bsd_dr_set (int regnum, unsigned long value)
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{
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struct thread_info *thread;
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struct dbreg dbregs;
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if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
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(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
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perror_with_name (_("Couldn't get debug registers"));
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/* For some mysterious reason, some of the reserved bits in the
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debug control register get set. Mask these off, otherwise the
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ptrace call below will fail. */
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DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00);
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DBREG_DRX ((&dbregs), regnum) = value;
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ALL_NON_EXITED_THREADS (thread)
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if (thread->inf == current_inferior ())
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{
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if (ptrace (PT_SETDBREGS, get_ptrace_pid (thread->ptid),
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(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
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perror_with_name (_("Couldn't write debug registers"));
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}
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}
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static void
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x86bsd_dr_set_control (unsigned long control)
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{
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x86bsd_dr_set (7, control);
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}
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static void
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x86bsd_dr_set_addr (int regnum, CORE_ADDR addr)
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{
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gdb_assert (regnum >= 0 && regnum <= 4);
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x86bsd_dr_set (regnum, addr);
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}
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static CORE_ADDR
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x86bsd_dr_get_addr (int regnum)
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{
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return x86bsd_dr_get (inferior_ptid, regnum);
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}
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static unsigned long
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x86bsd_dr_get_status (void)
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{
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return x86bsd_dr_get (inferior_ptid, 6);
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}
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static unsigned long
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x86bsd_dr_get_control (void)
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{
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return x86bsd_dr_get (inferior_ptid, 7);
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}
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#endif /* PT_GETDBREGS */
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/* Create a prototype *BSD/x86 target. The client can override it
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with local methods. */
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struct target_ops *
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x86bsd_target (void)
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{
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struct target_ops *t;
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t = inf_ptrace_target ();
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#ifdef HAVE_PT_GETDBREGS
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x86_use_watchpoints (t);
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x86_dr_low.set_control = x86bsd_dr_set_control;
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x86_dr_low.set_addr = x86bsd_dr_set_addr;
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x86_dr_low.get_addr = x86bsd_dr_get_addr;
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x86_dr_low.get_status = x86bsd_dr_get_status;
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x86_dr_low.get_control = x86bsd_dr_get_control;
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x86_set_debug_register_length (sizeof (void *));
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super_mourn_inferior = t->to_mourn_inferior;
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t->to_mourn_inferior = x86bsd_mourn_inferior;
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#endif /* HAVE_PT_GETDBREGS */
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return t;
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}
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