| 1 | /* Low level interface to i386 running the GNU Hurd. |
| 2 | Copyright 1992, 1995, 1996, 1998, 2000, 2001 |
| 3 | 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "inferior.h" |
| 24 | #include "floatformat.h" |
| 25 | #include "regcache.h" |
| 26 | |
| 27 | #include "gdb_assert.h" |
| 28 | #include <errno.h> |
| 29 | #include <stdio.h> |
| 30 | |
| 31 | #include <mach.h> |
| 32 | #include <mach_error.h> |
| 33 | #include <mach/message.h> |
| 34 | #include <mach/exception.h> |
| 35 | |
| 36 | #include "i386-tdep.h" |
| 37 | |
| 38 | #include "gnu-nat.h" |
| 39 | #include "i387-nat.h" |
| 40 | |
| 41 | #ifdef HAVE_SYS_PROCFS_H |
| 42 | # include <sys/procfs.h> |
| 43 | # include "gregset.h" |
| 44 | #endif |
| 45 | |
| 46 | /* Offset to the thread_state_t location where REG is stored. */ |
| 47 | #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg) |
| 48 | |
| 49 | /* At REG_OFFSET[N] is the offset to the thread_state_t location where |
| 50 | the GDB register N is stored. */ |
| 51 | static int reg_offset[] = |
| 52 | { |
| 53 | REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx), |
| 54 | REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi), |
| 55 | REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss), |
| 56 | REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs) |
| 57 | }; |
| 58 | |
| 59 | #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum]) |
| 60 | |
| 61 | \f |
| 62 | /* Get the whole floating-point state of THREAD and record the |
| 63 | values of the corresponding (pseudo) registers. */ |
| 64 | static void |
| 65 | fetch_fpregs (struct proc *thread) |
| 66 | { |
| 67 | mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; |
| 68 | struct i386_float_state state; |
| 69 | error_t err; |
| 70 | |
| 71 | err = thread_get_state (thread->port, i386_FLOAT_STATE, |
| 72 | (thread_state_t) &state, &count); |
| 73 | if (err) |
| 74 | { |
| 75 | warning ("Couldn't fetch floating-point state from %s", |
| 76 | proc_string (thread)); |
| 77 | return; |
| 78 | } |
| 79 | |
| 80 | if (!state.initialized) |
| 81 | /* The floating-point state isn't initialized. */ |
| 82 | { |
| 83 | int i; |
| 84 | |
| 85 | for (i = FP0_REGNUM; i <= FOP_REGNUM; i++) |
| 86 | supply_register (i, NULL); |
| 87 | |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | /* Supply the floating-point registers. */ |
| 92 | i387_supply_fsave (state.hw_state); |
| 93 | } |
| 94 | |
| 95 | #ifdef HAVE_SYS_PROCFS_H |
| 96 | /* These two calls are used by the core-regset.c code for |
| 97 | reading ELF core files. */ |
| 98 | void |
| 99 | supply_gregset (gdb_gregset_t *gregs) |
| 100 | { |
| 101 | int i; |
| 102 | for (i = 0; i < NUM_GREGS; i++) |
| 103 | supply_register (i, REG_ADDR (gregs, i)); |
| 104 | } |
| 105 | |
| 106 | void |
| 107 | supply_fpregset (gdb_fpregset_t *fpregs) |
| 108 | { |
| 109 | i387_supply_fsave ((char *) fpregs); |
| 110 | } |
| 111 | #endif |
| 112 | |
| 113 | /* Fetch register REGNO, or all regs if REGNO is -1. */ |
| 114 | void |
| 115 | gnu_fetch_registers (int regno) |
| 116 | { |
| 117 | struct proc *thread; |
| 118 | |
| 119 | /* Make sure we know about new threads. */ |
| 120 | inf_update_procs (current_inferior); |
| 121 | |
| 122 | thread = inf_tid_to_thread (current_inferior, PIDGET (inferior_ptid)); |
| 123 | if (!thread) |
| 124 | error ("Can't fetch registers from thread %d: No such thread", |
| 125 | PIDGET (inferior_ptid)); |
| 126 | |
| 127 | if (regno < NUM_GREGS || regno == -1) |
| 128 | { |
| 129 | thread_state_t state; |
| 130 | |
| 131 | /* This does the dirty work for us. */ |
| 132 | state = proc_get_state (thread, 0); |
| 133 | if (!state) |
| 134 | { |
| 135 | warning ("Couldn't fetch registers from %s", |
| 136 | proc_string (thread)); |
| 137 | return; |
| 138 | } |
| 139 | |
| 140 | if (regno == -1) |
| 141 | { |
| 142 | int i; |
| 143 | |
| 144 | proc_debug (thread, "fetching all register"); |
| 145 | |
| 146 | for (i = 0; i < NUM_GREGS; i++) |
| 147 | supply_register (i, REG_ADDR (state, i)); |
| 148 | thread->fetched_regs = ~0; |
| 149 | } |
| 150 | else |
| 151 | { |
| 152 | proc_debug (thread, "fetching register %s", REGISTER_NAME (regno)); |
| 153 | |
| 154 | supply_register (regno, REG_ADDR (state, regno)); |
| 155 | thread->fetched_regs |= (1 << regno); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | if (regno >= NUM_GREGS || regno == -1) |
| 160 | { |
| 161 | proc_debug (thread, "fetching floating-point registers"); |
| 162 | |
| 163 | fetch_fpregs (thread); |
| 164 | } |
| 165 | } |
| 166 | \f |
| 167 | |
| 168 | /* Store the whole floating-point state into THREAD using information |
| 169 | from the corresponding (pseudo) registers. */ |
| 170 | static void |
| 171 | store_fpregs (struct proc *thread, int regno) |
| 172 | { |
| 173 | mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; |
| 174 | struct i386_float_state state; |
| 175 | error_t err; |
| 176 | |
| 177 | err = thread_get_state (thread->port, i386_FLOAT_STATE, |
| 178 | (thread_state_t) &state, &count); |
| 179 | if (err) |
| 180 | { |
| 181 | warning ("Couldn't fetch floating-point state from %s", |
| 182 | proc_string (thread)); |
| 183 | return; |
| 184 | } |
| 185 | |
| 186 | /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow |
| 187 | take into account REGISTER_VALID like the old code did? */ |
| 188 | i387_fill_fsave (state.hw_state, regno); |
| 189 | |
| 190 | err = thread_set_state (thread->port, i386_FLOAT_STATE, |
| 191 | (thread_state_t) &state, i386_FLOAT_STATE_COUNT); |
| 192 | if (err) |
| 193 | { |
| 194 | warning ("Couldn't store floating-point state into %s", |
| 195 | proc_string (thread)); |
| 196 | return; |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | /* Store at least register REGNO, or all regs if REGNO == -1. */ |
| 201 | void |
| 202 | gnu_store_registers (int regno) |
| 203 | { |
| 204 | struct proc *thread; |
| 205 | |
| 206 | /* Make sure we know about new threads. */ |
| 207 | inf_update_procs (current_inferior); |
| 208 | |
| 209 | thread = inf_tid_to_thread (current_inferior, PIDGET (inferior_ptid)); |
| 210 | if (!thread) |
| 211 | error ("Couldn't store registers into thread %d: No such thread", |
| 212 | PIDGET (inferior_ptid)); |
| 213 | |
| 214 | if (regno < NUM_GREGS || regno == -1) |
| 215 | { |
| 216 | thread_state_t state; |
| 217 | thread_state_data_t old_state; |
| 218 | int was_aborted = thread->aborted; |
| 219 | int was_valid = thread->state_valid; |
| 220 | int trace; |
| 221 | |
| 222 | if (!was_aborted && was_valid) |
| 223 | memcpy (&old_state, &thread->state, sizeof (old_state)); |
| 224 | |
| 225 | state = proc_get_state (thread, 1); |
| 226 | if (!state) |
| 227 | { |
| 228 | warning ("Couldn't store registers into %s", proc_string (thread)); |
| 229 | return; |
| 230 | } |
| 231 | |
| 232 | /* Save the T bit. We might try to restore the %eflags register |
| 233 | below, but changing the T bit would seriously confuse GDB. */ |
| 234 | trace = ((struct i386_thread_state *)state)->efl & 0x100; |
| 235 | |
| 236 | if (!was_aborted && was_valid) |
| 237 | /* See which registers have changed after aborting the thread. */ |
| 238 | { |
| 239 | int check_regno; |
| 240 | |
| 241 | for (check_regno = 0; check_regno < NUM_GREGS; check_regno++) |
| 242 | if ((thread->fetched_regs & (1 << check_regno)) |
| 243 | && memcpy (REG_ADDR (&old_state, check_regno), |
| 244 | REG_ADDR (state, check_regno), |
| 245 | REGISTER_RAW_SIZE (check_regno))) |
| 246 | /* Register CHECK_REGNO has changed! Ack! */ |
| 247 | { |
| 248 | warning ("Register %s changed after the thread was aborted", |
| 249 | REGISTER_NAME (check_regno)); |
| 250 | if (regno >= 0 && regno != check_regno) |
| 251 | /* Update GDB's copy of the register. */ |
| 252 | supply_register (check_regno, REG_ADDR (state, check_regno)); |
| 253 | else |
| 254 | warning ("... also writing this register! Suspicious..."); |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | #define fill(state, regno) \ |
| 259 | memcpy (REG_ADDR(state, regno), ®isters[REGISTER_BYTE (regno)], \ |
| 260 | REGISTER_RAW_SIZE (regno)) |
| 261 | |
| 262 | if (regno == -1) |
| 263 | { |
| 264 | int i; |
| 265 | |
| 266 | proc_debug (thread, "storing all registers"); |
| 267 | |
| 268 | for (i = 0; i < NUM_GREGS; i++) |
| 269 | if (register_valid[i]) |
| 270 | fill (state, i); |
| 271 | } |
| 272 | else |
| 273 | { |
| 274 | proc_debug (thread, "storing register %s", REGISTER_NAME (regno)); |
| 275 | |
| 276 | gdb_assert (register_valid[regno]); |
| 277 | fill (state, regno); |
| 278 | } |
| 279 | |
| 280 | /* Restore the T bit. */ |
| 281 | ((struct i386_thread_state *)state)->efl &= ~0x100; |
| 282 | ((struct i386_thread_state *)state)->efl |= trace; |
| 283 | } |
| 284 | |
| 285 | #undef fill |
| 286 | |
| 287 | if (regno >= NUM_GREGS || regno == -1) |
| 288 | { |
| 289 | proc_debug (thread, "storing floating-point registers"); |
| 290 | |
| 291 | store_fpregs (thread, regno); |
| 292 | } |
| 293 | } |