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