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149 lines
3.9 KiB
C
149 lines
3.9 KiB
C
/* Native-dependent code for X86 BSD's.
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Copyright (C) 2003-2021 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 PTRACE_TYPE_RET
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gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr)
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{
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#ifdef __NetBSD__
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/* Support for NetBSD threads: unlike other ptrace implementations in this
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file, NetBSD requires that we pass both the pid and lwp. */
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return ptrace (request, ptid.pid (), addr, ptid.lwp ());
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#else
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pid_t pid = get_ptrace_pid (ptid);
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return ptrace (request, pid, addr, 0);
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#endif
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}
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/* Helper macro to access debug register X. FreeBSD/amd64 and modern
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versions of FreeBSD/i386 provide this macro in system headers. Define
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a local version for systems that do not provide it. */
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#ifndef DBREG_DRX
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#ifdef __NetBSD__
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#define DBREG_DRX(d, x) ((d)->dr[x])
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#else
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#define DBREG_DRX(d, x) ((&d->dr0)[x])
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#endif
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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 (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -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 (ptid_t ptid, int regnum, unsigned long value)
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{
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struct dbreg dbregs;
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if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -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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for (thread_info *thread : current_inferior ()->non_exited_threads ())
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{
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if (gdb_ptrace (PT_SETDBREGS, thread->ptid,
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(PTRACE_TYPE_ARG3) &dbregs) == -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 (inferior_ptid, 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 (inferior_ptid, 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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void _initialize_x86_bsd_nat ();
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void
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_initialize_x86_bsd_nat ()
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{
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#ifdef HAVE_PT_GETDBREGS
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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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#endif /* HAVE_PT_GETDBREGS */
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}
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