| 1 | /* Native-dependent code for modern i386 BSD's. |
| 2 | Copyright (C) 2000 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "inferior.h" |
| 23 | |
| 24 | #include <sys/types.h> |
| 25 | #include <sys/ptrace.h> |
| 26 | #include <machine/reg.h> |
| 27 | #include <machine/frame.h> |
| 28 | |
| 29 | #ifdef HAVE_SYS_PROCFS_H |
| 30 | #include <sys/procfs.h> |
| 31 | #endif |
| 32 | |
| 33 | #ifndef HAVE_GREGSET_T |
| 34 | typedef struct reg gregset_t; |
| 35 | #endif |
| 36 | |
| 37 | #ifndef HAVE_FPREGSET_T |
| 38 | typedef struct fpreg fpregset_t; |
| 39 | #endif |
| 40 | |
| 41 | #include "gregset.h" |
| 42 | \f |
| 43 | |
| 44 | /* In older BSD versions we cannot get at some of the segment |
| 45 | registers. FreeBSD for example didn't support the %fs and %gs |
| 46 | registers until the 3.0 release. We have autoconf checks for their |
| 47 | presence, and deal gracefully with their absence. */ |
| 48 | |
| 49 | /* Registers we shouldn't try to fetch. */ |
| 50 | #if !defined (CANNOT_FETCH_REGISTER) |
| 51 | #define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno) |
| 52 | #endif |
| 53 | |
| 54 | /* Registers we shouldn't try to store. */ |
| 55 | #if !defined (CANNOT_STORE_REGISTER) |
| 56 | #define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno) |
| 57 | #endif |
| 58 | |
| 59 | /* Offset to the gregset_t location where REG is stored. */ |
| 60 | #define REG_OFFSET(reg) offsetof (gregset_t, reg) |
| 61 | |
| 62 | /* At reg_offset[REGNO] you'll find the offset to the gregset_t |
| 63 | location where the GDB register REGNO is stored. Unsupported |
| 64 | registers are marked with `-1'. */ |
| 65 | static int reg_offset[] = |
| 66 | { |
| 67 | REG_OFFSET (r_eax), |
| 68 | REG_OFFSET (r_ecx), |
| 69 | REG_OFFSET (r_edx), |
| 70 | REG_OFFSET (r_edx), |
| 71 | REG_OFFSET (r_esp), |
| 72 | REG_OFFSET (r_ebp), |
| 73 | REG_OFFSET (r_esi), |
| 74 | REG_OFFSET (r_edi), |
| 75 | REG_OFFSET (r_eip), |
| 76 | REG_OFFSET (r_eflags), |
| 77 | REG_OFFSET (r_cs), |
| 78 | REG_OFFSET (r_ss), |
| 79 | REG_OFFSET (r_ds), |
| 80 | REG_OFFSET (r_es), |
| 81 | #ifdef HAVE_STRUCT_REG_R_FS |
| 82 | REG_OFFSET (r_fs), |
| 83 | #else |
| 84 | -1, |
| 85 | #endif |
| 86 | #ifdef HAVE_STRUCT_REG_R_GS |
| 87 | REG_OFFSET (r_gs) |
| 88 | #else |
| 89 | -1 |
| 90 | #endif |
| 91 | }; |
| 92 | |
| 93 | #define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno]) |
| 94 | |
| 95 | /* Return nonzero if we shouldn't try to fetch register REGNO. */ |
| 96 | |
| 97 | static int |
| 98 | cannot_fetch_register (int regno) |
| 99 | { |
| 100 | return (reg_offset[regno] == -1); |
| 101 | } |
| 102 | \f |
| 103 | |
| 104 | /* Transfering the registers between GDB, inferiors and core files. */ |
| 105 | |
| 106 | /* Fill GDB's register array with the general-purpose register values |
| 107 | in *GREGSETP. */ |
| 108 | |
| 109 | void |
| 110 | supply_gregset (gregset_t *gregsetp) |
| 111 | { |
| 112 | int i; |
| 113 | |
| 114 | for (i = 0; i < NUM_GREGS; i++) |
| 115 | { |
| 116 | if (CANNOT_FETCH_REGISTER (i)) |
| 117 | supply_register (i, NULL); |
| 118 | else |
| 119 | supply_register (i, REG_ADDR (gregsetp, i)); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /* Fill register REGNO (if it is a general-purpose register) in |
| 124 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, |
| 125 | do this for all registers. */ |
| 126 | |
| 127 | void |
| 128 | fill_gregset (gregset_t *gregsetp, int regno) |
| 129 | { |
| 130 | int i; |
| 131 | |
| 132 | for (i = 0; i < NUM_GREGS; i++) |
| 133 | if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i)) |
| 134 | memcpy (REG_ADDR (gregsetp, i), ®isters[REGISTER_BYTE (i)], |
| 135 | REGISTER_RAW_SIZE (i)); |
| 136 | } |
| 137 | |
| 138 | #include "i387-nat.h" |
| 139 | |
| 140 | /* Fill GDB's register array with the floating-point register values |
| 141 | in *FPREGSETP. */ |
| 142 | |
| 143 | void |
| 144 | supply_fpregset (fpregset_t *fpregsetp) |
| 145 | { |
| 146 | i387_supply_fsave ((char *) fpregsetp); |
| 147 | } |
| 148 | |
| 149 | /* Fill register REGNO (if it is a floating-point register) in |
| 150 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, |
| 151 | do this for all registers. */ |
| 152 | |
| 153 | void |
| 154 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
| 155 | { |
| 156 | i387_fill_fsave ((char *) fpregsetp, regno); |
| 157 | } |
| 158 | |
| 159 | /* Fetch register REGNO from the inferior. If REGNO is -1, do this |
| 160 | for all registers (including the floating point registers). */ |
| 161 | |
| 162 | void |
| 163 | fetch_inferior_registers (int regno) |
| 164 | { |
| 165 | gregset_t gregs; |
| 166 | |
| 167 | if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1) |
| 168 | perror_with_name ("Couldn't get registers"); |
| 169 | |
| 170 | supply_gregset (&gregs); |
| 171 | |
| 172 | if (regno == -1 || regno >= FP0_REGNUM) |
| 173 | { |
| 174 | fpregset_t fpregs; |
| 175 | |
| 176 | if (ptrace (PT_GETFPREGS, inferior_pid, |
| 177 | (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) |
| 178 | perror_with_name ("Couldn't get floating point status"); |
| 179 | |
| 180 | supply_fpregset (&fpregs); |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /* Store register REGNO back into the inferior. If REGNO is -1, do |
| 185 | this for all registers (including the floating point registers). */ |
| 186 | |
| 187 | void |
| 188 | store_inferior_registers (int regno) |
| 189 | { |
| 190 | gregset_t gregs; |
| 191 | |
| 192 | if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1) |
| 193 | perror_with_name ("Couldn't get registers"); |
| 194 | |
| 195 | fill_gregset (&gregs, regno); |
| 196 | |
| 197 | if (ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1) |
| 198 | perror_with_name ("Couldn't write registers"); |
| 199 | |
| 200 | if (regno == -1 || regno >= FP0_REGNUM) |
| 201 | { |
| 202 | fpregset_t fpregs; |
| 203 | |
| 204 | if (ptrace (PT_GETFPREGS, inferior_pid, |
| 205 | (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) |
| 206 | perror_with_name ("Couldn't get floating point status"); |
| 207 | |
| 208 | fill_fpregset (&fpregs, regno); |
| 209 | |
| 210 | if (ptrace (PT_SETFPREGS, inferior_pid, |
| 211 | (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) |
| 212 | perror_with_name ("Couldn't write floating point status"); |
| 213 | } |
| 214 | } |
| 215 | \f |
| 216 | |
| 217 | /* Support for the user struct. */ |
| 218 | |
| 219 | /* Return the address register REGNO. BLOCKEND is the value of |
| 220 | u.u_ar0, which should point to the registers. */ |
| 221 | |
| 222 | CORE_ADDR |
| 223 | register_u_addr (CORE_ADDR blockend, int regno) |
| 224 | { |
| 225 | return (CORE_ADDR) REG_ADDR (blockend, regno); |
| 226 | } |
| 227 | |
| 228 | #include <sys/param.h> |
| 229 | #include <sys/user.h> |
| 230 | |
| 231 | /* Return the size of the user struct. */ |
| 232 | |
| 233 | int |
| 234 | kernel_u_size (void) |
| 235 | { |
| 236 | return (sizeof (struct user)); |
| 237 | } |