| 1 | /* Native-dependent code for AMD64 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 "regcache.h" |
| 23 | #include "target.h" |
| 24 | |
| 25 | /* We include <signal.h> to make sure `struct fxsave64' is defined on |
| 26 | NetBSD, since NetBSD's <machine/reg.h> needs it. */ |
| 27 | #include <signal.h> |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/ptrace.h> |
| 30 | #include <machine/reg.h> |
| 31 | |
| 32 | #include "amd64-tdep.h" |
| 33 | #include "amd64-nat.h" |
| 34 | #include "x86-bsd-nat.h" |
| 35 | #include "inf-ptrace.h" |
| 36 | #include "amd64-bsd-nat.h" |
| 37 | \f |
| 38 | |
| 39 | static PTRACE_TYPE_RET |
| 40 | gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr, |
| 41 | PTRACE_TYPE_ARG4 data) |
| 42 | { |
| 43 | #ifdef __NetBSD__ |
| 44 | gdb_assert (data == 0); |
| 45 | /* Support for NetBSD threads: unlike other ptrace implementations in this |
| 46 | file, NetBSD requires that we pass both the pid and lwp. */ |
| 47 | return ptrace (request, ptid.pid (), addr, ptid.lwp ()); |
| 48 | #else |
| 49 | pid_t pid = get_ptrace_pid (ptid); |
| 50 | return ptrace (request, pid, addr, data); |
| 51 | #endif |
| 52 | } |
| 53 | |
| 54 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
| 55 | for all registers (including the floating-point registers). */ |
| 56 | |
| 57 | void |
| 58 | amd64bsd_fetch_inferior_registers (struct regcache *regcache, int regnum) |
| 59 | { |
| 60 | struct gdbarch *gdbarch = regcache->arch (); |
| 61 | ptid_t ptid = regcache->ptid (); |
| 62 | #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE) |
| 63 | const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 64 | #endif |
| 65 | |
| 66 | if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 67 | { |
| 68 | struct reg regs; |
| 69 | |
| 70 | if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 71 | perror_with_name (_("Couldn't get registers")); |
| 72 | |
| 73 | amd64_supply_native_gregset (regcache, ®s, -1); |
| 74 | if (regnum != -1) |
| 75 | return; |
| 76 | } |
| 77 | |
| 78 | #ifdef PT_GETFSBASE |
| 79 | if (regnum == -1 || regnum == tdep->fsbase_regnum) |
| 80 | { |
| 81 | register_t base; |
| 82 | |
| 83 | if (gdb_ptrace (PT_GETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1) |
| 84 | perror_with_name (_("Couldn't get segment register fs_base")); |
| 85 | |
| 86 | regcache->raw_supply (tdep->fsbase_regnum, &base); |
| 87 | if (regnum != -1) |
| 88 | return; |
| 89 | } |
| 90 | #endif |
| 91 | #ifdef PT_GETGSBASE |
| 92 | if (regnum == -1 || regnum == tdep->fsbase_regnum + 1) |
| 93 | { |
| 94 | register_t base; |
| 95 | |
| 96 | if (gdb_ptrace (PT_GETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1) |
| 97 | perror_with_name (_("Couldn't get segment register gs_base")); |
| 98 | |
| 99 | regcache->raw_supply (tdep->fsbase_regnum + 1, &base); |
| 100 | if (regnum != -1) |
| 101 | return; |
| 102 | } |
| 103 | #endif |
| 104 | |
| 105 | if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 106 | { |
| 107 | struct fpreg fpregs; |
| 108 | #ifdef PT_GETXSTATE_INFO |
| 109 | void *xstateregs; |
| 110 | |
| 111 | if (x86bsd_xsave_len != 0) |
| 112 | { |
| 113 | xstateregs = alloca (x86bsd_xsave_len); |
| 114 | if (gdb_ptrace (PT_GETXSTATE, ptid, (PTRACE_TYPE_ARG3) xstateregs, 0) |
| 115 | == -1) |
| 116 | perror_with_name (_("Couldn't get extended state status")); |
| 117 | |
| 118 | amd64_supply_xsave (regcache, -1, xstateregs); |
| 119 | return; |
| 120 | } |
| 121 | #endif |
| 122 | |
| 123 | if (gdb_ptrace (PT_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 124 | perror_with_name (_("Couldn't get floating point status")); |
| 125 | |
| 126 | amd64_supply_fxsave (regcache, -1, &fpregs); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
| 131 | this for all registers (including the floating-point registers). */ |
| 132 | |
| 133 | void |
| 134 | amd64bsd_store_inferior_registers (struct regcache *regcache, int regnum) |
| 135 | { |
| 136 | struct gdbarch *gdbarch = regcache->arch (); |
| 137 | ptid_t ptid = regcache->ptid (); |
| 138 | #if defined(PT_SETFSBASE) || defined(PT_SETGSBASE) |
| 139 | const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 140 | #endif |
| 141 | |
| 142 | if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 143 | { |
| 144 | struct reg regs; |
| 145 | |
| 146 | if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 147 | perror_with_name (_("Couldn't get registers")); |
| 148 | |
| 149 | amd64_collect_native_gregset (regcache, ®s, regnum); |
| 150 | |
| 151 | if (gdb_ptrace (PT_SETREGS, ptid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 152 | perror_with_name (_("Couldn't write registers")); |
| 153 | |
| 154 | if (regnum != -1) |
| 155 | return; |
| 156 | } |
| 157 | |
| 158 | #ifdef PT_SETFSBASE |
| 159 | if (regnum == -1 || regnum == tdep->fsbase_regnum) |
| 160 | { |
| 161 | register_t base; |
| 162 | |
| 163 | /* Clear the full base value to support 32-bit targets. */ |
| 164 | base = 0; |
| 165 | regcache->raw_collect (tdep->fsbase_regnum, &base); |
| 166 | |
| 167 | if (gdb_ptrace (PT_SETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1) |
| 168 | perror_with_name (_("Couldn't write segment register fs_base")); |
| 169 | if (regnum != -1) |
| 170 | return; |
| 171 | } |
| 172 | #endif |
| 173 | #ifdef PT_SETGSBASE |
| 174 | if (regnum == -1 || regnum == tdep->fsbase_regnum + 1) |
| 175 | { |
| 176 | register_t base; |
| 177 | |
| 178 | /* Clear the full base value to support 32-bit targets. */ |
| 179 | base = 0; |
| 180 | regcache->raw_collect (tdep->fsbase_regnum + 1, &base); |
| 181 | |
| 182 | if (gdb_ptrace (PT_SETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1) |
| 183 | perror_with_name (_("Couldn't write segment register gs_base")); |
| 184 | if (regnum != -1) |
| 185 | return; |
| 186 | } |
| 187 | #endif |
| 188 | |
| 189 | if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) |
| 190 | { |
| 191 | struct fpreg fpregs; |
| 192 | #ifdef PT_GETXSTATE_INFO |
| 193 | void *xstateregs; |
| 194 | |
| 195 | if (x86bsd_xsave_len != 0) |
| 196 | { |
| 197 | xstateregs = alloca (x86bsd_xsave_len); |
| 198 | if (gdb_ptrace (PT_GETXSTATE, ptid, (PTRACE_TYPE_ARG3) xstateregs, 0) |
| 199 | == -1) |
| 200 | perror_with_name (_("Couldn't get extended state status")); |
| 201 | |
| 202 | amd64_collect_xsave (regcache, regnum, xstateregs, 0); |
| 203 | |
| 204 | if (gdb_ptrace (PT_SETXSTATE, ptid, (PTRACE_TYPE_ARG3) xstateregs, |
| 205 | x86bsd_xsave_len) == -1) |
| 206 | perror_with_name (_("Couldn't write extended state status")); |
| 207 | return; |
| 208 | } |
| 209 | #endif |
| 210 | |
| 211 | if (gdb_ptrace (PT_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 212 | perror_with_name (_("Couldn't get floating point status")); |
| 213 | |
| 214 | amd64_collect_fxsave (regcache, regnum, &fpregs); |
| 215 | |
| 216 | if (gdb_ptrace (PT_SETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 217 | perror_with_name (_("Couldn't write floating point status")); |
| 218 | } |
| 219 | } |