| 1 | /* Low level interface to i386 running the GNU Hurd. |
| 2 | |
| 3 | Copyright (C) 1992-2013 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 "floatformat.h" |
| 23 | #include "regcache.h" |
| 24 | |
| 25 | #include "gdb_assert.h" |
| 26 | #include <errno.h> |
| 27 | #include <stdio.h> |
| 28 | #include "gdb_string.h" |
| 29 | |
| 30 | #include <mach.h> |
| 31 | #include <mach_error.h> |
| 32 | #include <mach/message.h> |
| 33 | #include <mach/exception.h> |
| 34 | |
| 35 | #include "i386-tdep.h" |
| 36 | |
| 37 | #include "gnu-nat.h" |
| 38 | #include "i387-tdep.h" |
| 39 | |
| 40 | #ifdef HAVE_SYS_PROCFS_H |
| 41 | # include <sys/procfs.h> |
| 42 | # include "gregset.h" |
| 43 | #endif |
| 44 | |
| 45 | /* Offset to the thread_state_t location where REG is stored. */ |
| 46 | #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg) |
| 47 | |
| 48 | /* At REG_OFFSET[N] is the offset to the thread_state_t location where |
| 49 | the GDB register N is stored. */ |
| 50 | static int reg_offset[] = |
| 51 | { |
| 52 | REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx), |
| 53 | REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi), |
| 54 | REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss), |
| 55 | REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs) |
| 56 | }; |
| 57 | |
| 58 | /* Offset to the greg_t location where REG is stored. */ |
| 59 | #define CREG_OFFSET(reg) (REG_##reg * 4) |
| 60 | |
| 61 | /* At CREG_OFFSET[N] is the offset to the greg_t location where |
| 62 | the GDB register N is stored. */ |
| 63 | static int creg_offset[] = |
| 64 | { |
| 65 | CREG_OFFSET (EAX), CREG_OFFSET (ECX), CREG_OFFSET (EDX), CREG_OFFSET (EBX), |
| 66 | CREG_OFFSET (UESP), CREG_OFFSET (EBP), CREG_OFFSET (ESI), CREG_OFFSET (EDI), |
| 67 | CREG_OFFSET (EIP), CREG_OFFSET (EFL), CREG_OFFSET (CS), CREG_OFFSET (SS), |
| 68 | CREG_OFFSET (DS), CREG_OFFSET (ES), CREG_OFFSET (FS), CREG_OFFSET (GS) |
| 69 | }; |
| 70 | |
| 71 | #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum]) |
| 72 | #define CREG_ADDR(state, regnum) ((const char *)(state) + creg_offset[regnum]) |
| 73 | |
| 74 | \f |
| 75 | /* Get the whole floating-point state of THREAD and record the values |
| 76 | of the corresponding (pseudo) registers. */ |
| 77 | |
| 78 | static void |
| 79 | fetch_fpregs (struct regcache *regcache, struct proc *thread) |
| 80 | { |
| 81 | mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; |
| 82 | struct i386_float_state state; |
| 83 | error_t err; |
| 84 | |
| 85 | err = thread_get_state (thread->port, i386_FLOAT_STATE, |
| 86 | (thread_state_t) &state, &count); |
| 87 | if (err) |
| 88 | { |
| 89 | warning (_("Couldn't fetch floating-point state from %s"), |
| 90 | proc_string (thread)); |
| 91 | return; |
| 92 | } |
| 93 | |
| 94 | if (!state.initialized) |
| 95 | { |
| 96 | /* The floating-point state isn't initialized. */ |
| 97 | i387_supply_fsave (regcache, -1, NULL); |
| 98 | } |
| 99 | else |
| 100 | { |
| 101 | /* Supply the floating-point registers. */ |
| 102 | i387_supply_fsave (regcache, -1, state.hw_state); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | #ifdef HAVE_SYS_PROCFS_H |
| 107 | /* These two calls are used by the core-regset.c code for |
| 108 | reading ELF core files. */ |
| 109 | void |
| 110 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregs) |
| 111 | { |
| 112 | int i; |
| 113 | for (i = 0; i < I386_NUM_GREGS; i++) |
| 114 | regcache_raw_supply (regcache, i, CREG_ADDR (gregs, i)); |
| 115 | } |
| 116 | |
| 117 | void |
| 118 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) |
| 119 | { |
| 120 | i387_supply_fsave (regcache, -1, fpregs); |
| 121 | } |
| 122 | #endif |
| 123 | |
| 124 | /* Fetch register REGNO, or all regs if REGNO is -1. */ |
| 125 | static void |
| 126 | gnu_fetch_registers (struct target_ops *ops, |
| 127 | struct regcache *regcache, int regno) |
| 128 | { |
| 129 | struct proc *thread; |
| 130 | |
| 131 | /* Make sure we know about new threads. */ |
| 132 | inf_update_procs (gnu_current_inf); |
| 133 | |
| 134 | thread = inf_tid_to_thread (gnu_current_inf, |
| 135 | ptid_get_tid (inferior_ptid)); |
| 136 | if (!thread) |
| 137 | error (_("Can't fetch registers from thread %s: No such thread"), |
| 138 | target_pid_to_str (inferior_ptid)); |
| 139 | |
| 140 | if (regno < I386_NUM_GREGS || regno == -1) |
| 141 | { |
| 142 | thread_state_t state; |
| 143 | |
| 144 | /* This does the dirty work for us. */ |
| 145 | state = proc_get_state (thread, 0); |
| 146 | if (!state) |
| 147 | { |
| 148 | warning (_("Couldn't fetch registers from %s"), |
| 149 | proc_string (thread)); |
| 150 | return; |
| 151 | } |
| 152 | |
| 153 | if (regno == -1) |
| 154 | { |
| 155 | int i; |
| 156 | |
| 157 | proc_debug (thread, "fetching all register"); |
| 158 | |
| 159 | for (i = 0; i < I386_NUM_GREGS; i++) |
| 160 | regcache_raw_supply (regcache, i, REG_ADDR (state, i)); |
| 161 | thread->fetched_regs = ~0; |
| 162 | } |
| 163 | else |
| 164 | { |
| 165 | proc_debug (thread, "fetching register %s", |
| 166 | gdbarch_register_name (get_regcache_arch (regcache), |
| 167 | regno)); |
| 168 | |
| 169 | regcache_raw_supply (regcache, regno, |
| 170 | REG_ADDR (state, regno)); |
| 171 | thread->fetched_regs |= (1 << regno); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | if (regno >= I386_NUM_GREGS || regno == -1) |
| 176 | { |
| 177 | proc_debug (thread, "fetching floating-point registers"); |
| 178 | |
| 179 | fetch_fpregs (regcache, thread); |
| 180 | } |
| 181 | } |
| 182 | \f |
| 183 | |
| 184 | /* Store the whole floating-point state into THREAD using information |
| 185 | from the corresponding (pseudo) registers. */ |
| 186 | static void |
| 187 | store_fpregs (const struct regcache *regcache, struct proc *thread, int regno) |
| 188 | { |
| 189 | mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; |
| 190 | struct i386_float_state state; |
| 191 | error_t err; |
| 192 | |
| 193 | err = thread_get_state (thread->port, i386_FLOAT_STATE, |
| 194 | (thread_state_t) &state, &count); |
| 195 | if (err) |
| 196 | { |
| 197 | warning (_("Couldn't fetch floating-point state from %s"), |
| 198 | proc_string (thread)); |
| 199 | return; |
| 200 | } |
| 201 | |
| 202 | /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow |
| 203 | take into account DEPRECATED_REGISTER_VALID like the old code did? */ |
| 204 | i387_collect_fsave (regcache, regno, state.hw_state); |
| 205 | |
| 206 | err = thread_set_state (thread->port, i386_FLOAT_STATE, |
| 207 | (thread_state_t) &state, i386_FLOAT_STATE_COUNT); |
| 208 | if (err) |
| 209 | { |
| 210 | warning (_("Couldn't store floating-point state into %s"), |
| 211 | proc_string (thread)); |
| 212 | return; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | /* Store at least register REGNO, or all regs if REGNO == -1. */ |
| 217 | static void |
| 218 | gnu_store_registers (struct target_ops *ops, |
| 219 | struct regcache *regcache, int regno) |
| 220 | { |
| 221 | struct proc *thread; |
| 222 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 223 | |
| 224 | /* Make sure we know about new threads. */ |
| 225 | inf_update_procs (gnu_current_inf); |
| 226 | |
| 227 | thread = inf_tid_to_thread (gnu_current_inf, |
| 228 | ptid_get_tid (inferior_ptid)); |
| 229 | if (!thread) |
| 230 | error (_("Couldn't store registers into thread %s: No such thread"), |
| 231 | target_pid_to_str (inferior_ptid)); |
| 232 | |
| 233 | if (regno < I386_NUM_GREGS || regno == -1) |
| 234 | { |
| 235 | thread_state_t state; |
| 236 | thread_state_data_t old_state; |
| 237 | int was_aborted = thread->aborted; |
| 238 | int was_valid = thread->state_valid; |
| 239 | int trace; |
| 240 | |
| 241 | if (!was_aborted && was_valid) |
| 242 | memcpy (&old_state, &thread->state, sizeof (old_state)); |
| 243 | |
| 244 | state = proc_get_state (thread, 1); |
| 245 | if (!state) |
| 246 | { |
| 247 | warning (_("Couldn't store registers into %s"), |
| 248 | proc_string (thread)); |
| 249 | return; |
| 250 | } |
| 251 | |
| 252 | /* Save the T bit. We might try to restore the %eflags register |
| 253 | below, but changing the T bit would seriously confuse GDB. */ |
| 254 | trace = ((struct i386_thread_state *)state)->efl & 0x100; |
| 255 | |
| 256 | if (!was_aborted && was_valid) |
| 257 | /* See which registers have changed after aborting the thread. */ |
| 258 | { |
| 259 | int check_regno; |
| 260 | |
| 261 | for (check_regno = 0; check_regno < I386_NUM_GREGS; check_regno++) |
| 262 | if ((thread->fetched_regs & (1 << check_regno)) |
| 263 | && memcpy (REG_ADDR (&old_state, check_regno), |
| 264 | REG_ADDR (state, check_regno), |
| 265 | register_size (gdbarch, check_regno))) |
| 266 | /* Register CHECK_REGNO has changed! Ack! */ |
| 267 | { |
| 268 | warning (_("Register %s changed after the thread was aborted"), |
| 269 | gdbarch_register_name (gdbarch, check_regno)); |
| 270 | if (regno >= 0 && regno != check_regno) |
| 271 | /* Update GDB's copy of the register. */ |
| 272 | regcache_raw_supply (regcache, check_regno, |
| 273 | REG_ADDR (state, check_regno)); |
| 274 | else |
| 275 | warning (_("... also writing this register! " |
| 276 | "Suspicious...")); |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | if (regno == -1) |
| 281 | { |
| 282 | int i; |
| 283 | |
| 284 | proc_debug (thread, "storing all registers"); |
| 285 | |
| 286 | for (i = 0; i < I386_NUM_GREGS; i++) |
| 287 | if (REG_VALID == regcache_register_status (regcache, i)) |
| 288 | regcache_raw_collect (regcache, i, REG_ADDR (state, i)); |
| 289 | } |
| 290 | else |
| 291 | { |
| 292 | proc_debug (thread, "storing register %s", |
| 293 | gdbarch_register_name (gdbarch, regno)); |
| 294 | |
| 295 | gdb_assert (REG_VALID == regcache_register_status (regcache, regno)); |
| 296 | regcache_raw_collect (regcache, regno, REG_ADDR (state, regno)); |
| 297 | } |
| 298 | |
| 299 | /* Restore the T bit. */ |
| 300 | ((struct i386_thread_state *)state)->efl &= ~0x100; |
| 301 | ((struct i386_thread_state *)state)->efl |= trace; |
| 302 | } |
| 303 | |
| 304 | if (regno >= I386_NUM_GREGS || regno == -1) |
| 305 | { |
| 306 | proc_debug (thread, "storing floating-point registers"); |
| 307 | |
| 308 | store_fpregs (regcache, thread, regno); |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 313 | extern initialize_file_ftype _initialize_i386gnu_nat; |
| 314 | |
| 315 | void |
| 316 | _initialize_i386gnu_nat (void) |
| 317 | { |
| 318 | struct target_ops *t; |
| 319 | |
| 320 | /* Fill in the generic GNU/Hurd methods. */ |
| 321 | t = gnu_target (); |
| 322 | |
| 323 | t->to_fetch_registers = gnu_fetch_registers; |
| 324 | t->to_store_registers = gnu_store_registers; |
| 325 | |
| 326 | /* Register the target. */ |
| 327 | add_target (t); |
| 328 | } |