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 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, inferior_ptid.lwp ()); 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 } 220