/* 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); } /* Helper macro to access debug register X. FreeBSD/amd64 and modern versions of FreeBSD/i386 provide this macro in system headers. Define a local version for systems that do not provide it. */ #ifndef DBREG_DRX #ifdef __NetBSD__ #define DBREG_DRX(d, x) ((d)->dr[x]) #else #define DBREG_DRX(d, x) ((&d->dr0)[x]) #endif #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; }