| /* Native-dependent code for X86 BSD's. |
| |
| Copyright (C) 2003-2021 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 PTRACE_TYPE_RET |
| gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr) |
| { |
| #ifdef __NetBSD__ |
| /* Support for NetBSD threads: unlike other ptrace implementations in this |
| file, NetBSD requires that we pass both the pid and lwp. */ |
| return ptrace (request, ptid.pid (), addr, ptid.lwp ()); |
| #else |
| pid_t pid = get_ptrace_pid (ptid); |
| return ptrace (request, pid, addr, 0); |
| #endif |
| } |
| |
| /* 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 (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -1) |
| perror_with_name (_("Couldn't read debug registers")); |
| |
| return DBREG_DRX ((&dbregs), regnum); |
| } |
| |
| static void |
| x86bsd_dr_set (ptid_t ptid, int regnum, unsigned long value) |
| { |
| struct dbreg dbregs; |
| |
| if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -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; |
| |
| for (thread_info *thread : current_inferior ()->non_exited_threads ()) |
| { |
| if (gdb_ptrace (PT_SETDBREGS, thread->ptid, |
| (PTRACE_TYPE_ARG3) &dbregs) == -1) |
| perror_with_name (_("Couldn't write debug registers")); |
| } |
| } |
| |
| static void |
| x86bsd_dr_set_control (unsigned long control) |
| { |
| x86bsd_dr_set (inferior_ptid, 7, control); |
| } |
| |
| static void |
| x86bsd_dr_set_addr (int regnum, CORE_ADDR addr) |
| { |
| gdb_assert (regnum >= 0 && regnum <= 4); |
| |
| x86bsd_dr_set (inferior_ptid, 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 */ |
| |
| void _initialize_x86_bsd_nat (); |
| void |
| _initialize_x86_bsd_nat () |
| { |
| #ifdef HAVE_PT_GETDBREGS |
| 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 *)); |
| #endif /* HAVE_PT_GETDBREGS */ |
| } |