| 1 | /* Native-dependent code for X86 BSD's. |
| 2 | |
| 3 | Copyright (C) 2003-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "inferior.h" |
| 22 | #include "gdbthread.h" |
| 23 | |
| 24 | /* We include <signal.h> to make sure `struct fxsave64' is defined on |
| 25 | NetBSD, since NetBSD's <machine/reg.h> needs it. */ |
| 26 | #include <signal.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/ptrace.h> |
| 29 | #include <machine/reg.h> |
| 30 | |
| 31 | #include "x86-nat.h" |
| 32 | #include "x86-bsd-nat.h" |
| 33 | #include "inf-ptrace.h" |
| 34 | \f |
| 35 | |
| 36 | static PTRACE_TYPE_RET |
| 37 | gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr) |
| 38 | { |
| 39 | #ifdef __NetBSD__ |
| 40 | /* Support for NetBSD threads: unlike other ptrace implementations in this |
| 41 | file, NetBSD requires that we pass both the pid and lwp. */ |
| 42 | return ptrace (request, ptid.pid (), addr, ptid.lwp ()); |
| 43 | #else |
| 44 | pid_t pid = get_ptrace_pid (ptid); |
| 45 | return ptrace (request, pid, addr, 0); |
| 46 | #endif |
| 47 | } |
| 48 | |
| 49 | #ifdef PT_GETXSTATE_INFO |
| 50 | size_t x86bsd_xsave_len; |
| 51 | #endif |
| 52 | |
| 53 | /* Support for debug registers. */ |
| 54 | |
| 55 | #ifdef HAVE_PT_GETDBREGS |
| 56 | |
| 57 | /* Helper macro to access debug register X. FreeBSD/amd64 and modern |
| 58 | versions of FreeBSD/i386 provide this macro in system headers. Define |
| 59 | a local version for systems that do not provide it. */ |
| 60 | #ifndef DBREG_DRX |
| 61 | #ifdef __NetBSD__ |
| 62 | #define DBREG_DRX(d, x) ((d)->dr[x]) |
| 63 | #else |
| 64 | #define DBREG_DRX(d, x) ((&d->dr0)[x]) |
| 65 | #endif |
| 66 | #endif |
| 67 | |
| 68 | static unsigned long |
| 69 | x86bsd_dr_get (ptid_t ptid, int regnum) |
| 70 | { |
| 71 | struct dbreg dbregs; |
| 72 | |
| 73 | if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -1) |
| 74 | perror_with_name (_("Couldn't read debug registers")); |
| 75 | |
| 76 | return DBREG_DRX ((&dbregs), regnum); |
| 77 | } |
| 78 | |
| 79 | static void |
| 80 | x86bsd_dr_set (ptid_t ptid, int regnum, unsigned long value) |
| 81 | { |
| 82 | struct dbreg dbregs; |
| 83 | |
| 84 | if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -1) |
| 85 | perror_with_name (_("Couldn't get debug registers")); |
| 86 | |
| 87 | /* For some mysterious reason, some of the reserved bits in the |
| 88 | debug control register get set. Mask these off, otherwise the |
| 89 | ptrace call below will fail. */ |
| 90 | DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00); |
| 91 | |
| 92 | DBREG_DRX ((&dbregs), regnum) = value; |
| 93 | |
| 94 | for (thread_info *thread : current_inferior ()->non_exited_threads ()) |
| 95 | { |
| 96 | if (gdb_ptrace (PT_SETDBREGS, thread->ptid, |
| 97 | (PTRACE_TYPE_ARG3) &dbregs) == -1) |
| 98 | perror_with_name (_("Couldn't write debug registers")); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | static void |
| 103 | x86bsd_dr_set_control (unsigned long control) |
| 104 | { |
| 105 | x86bsd_dr_set (inferior_ptid, 7, control); |
| 106 | } |
| 107 | |
| 108 | static void |
| 109 | x86bsd_dr_set_addr (int regnum, CORE_ADDR addr) |
| 110 | { |
| 111 | gdb_assert (regnum >= 0 && regnum <= 4); |
| 112 | |
| 113 | x86bsd_dr_set (inferior_ptid, regnum, addr); |
| 114 | } |
| 115 | |
| 116 | static CORE_ADDR |
| 117 | x86bsd_dr_get_addr (int regnum) |
| 118 | { |
| 119 | return x86bsd_dr_get (inferior_ptid, regnum); |
| 120 | } |
| 121 | |
| 122 | static unsigned long |
| 123 | x86bsd_dr_get_status (void) |
| 124 | { |
| 125 | return x86bsd_dr_get (inferior_ptid, 6); |
| 126 | } |
| 127 | |
| 128 | static unsigned long |
| 129 | x86bsd_dr_get_control (void) |
| 130 | { |
| 131 | return x86bsd_dr_get (inferior_ptid, 7); |
| 132 | } |
| 133 | |
| 134 | #endif /* PT_GETDBREGS */ |
| 135 | |
| 136 | void _initialize_x86_bsd_nat (); |
| 137 | void |
| 138 | _initialize_x86_bsd_nat () |
| 139 | { |
| 140 | #ifdef HAVE_PT_GETDBREGS |
| 141 | x86_dr_low.set_control = x86bsd_dr_set_control; |
| 142 | x86_dr_low.set_addr = x86bsd_dr_set_addr; |
| 143 | x86_dr_low.get_addr = x86bsd_dr_get_addr; |
| 144 | x86_dr_low.get_status = x86bsd_dr_get_status; |
| 145 | x86_dr_low.get_control = x86bsd_dr_get_control; |
| 146 | x86_set_debug_register_length (sizeof (void *)); |
| 147 | #endif /* HAVE_PT_GETDBREGS */ |
| 148 | } |