| 1 | /* Low level interface to i386 running the GNU Hurd. |
| 2 | Copyright (C) 1992, 1995, 1996, 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 | #include "floatformat.h" |
| 24 | |
| 25 | #include "gdb_assert.h" |
| 26 | #include <stdio.h> |
| 27 | #include <errno.h> |
| 28 | |
| 29 | #include <mach.h> |
| 30 | #include <mach_error.h> |
| 31 | #include <mach/message.h> |
| 32 | #include <mach/exception.h> |
| 33 | |
| 34 | #include "gnu-nat.h" |
| 35 | |
| 36 | /* The FPU hardware state. */ |
| 37 | struct env387 |
| 38 | { |
| 39 | unsigned short control; |
| 40 | unsigned short r0; |
| 41 | unsigned short status; |
| 42 | unsigned short r1; |
| 43 | unsigned short tag; |
| 44 | unsigned short r2; |
| 45 | unsigned long eip; |
| 46 | unsigned short code_seg; |
| 47 | unsigned short opcode; |
| 48 | unsigned long operand; |
| 49 | unsigned short operand_seg; |
| 50 | unsigned short r3; |
| 51 | unsigned char regs[8][10]; |
| 52 | }; |
| 53 | |
| 54 | \f |
| 55 | /* Offset to the thread_state_t location where REG is stored. */ |
| 56 | #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg) |
| 57 | |
| 58 | /* At reg_offset[i] is the offset to the thread_state_t location where |
| 59 | the gdb registers[i] is stored. */ |
| 60 | static int reg_offset[] = |
| 61 | { |
| 62 | REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx), |
| 63 | REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi), |
| 64 | REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss), |
| 65 | REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs) |
| 66 | }; |
| 67 | |
| 68 | #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum]) |
| 69 | |
| 70 | \f |
| 71 | /* Get the whole floating-point state of THREAD and record the |
| 72 | values of the corresponding (pseudo) registers. */ |
| 73 | static void |
| 74 | fetch_fpregs (struct proc *thread) |
| 75 | { |
| 76 | mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; |
| 77 | struct i386_float_state state; |
| 78 | struct env387 *ep = (struct env387 *) state.hw_state; |
| 79 | error_t err; |
| 80 | int i; |
| 81 | |
| 82 | err = thread_get_state (thread->port, i386_FLOAT_STATE, |
| 83 | (thread_state_t) &state, &count); |
| 84 | if (err) |
| 85 | { |
| 86 | warning ("Couldn't fetch floating-point state from %s", |
| 87 | proc_string (thread)); |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | if (! state.initialized) |
| 92 | /* The floating-point state isn't initialized. */ |
| 93 | { |
| 94 | for (i = FP0_REGNUM; i <= FP7_REGNUM; i++) |
| 95 | supply_register (i, NULL); |
| 96 | for (i = FIRST_FPU_CTRL_REGNUM; i <= LAST_FPU_CTRL_REGNUM; i++) |
| 97 | supply_register (i, NULL); |
| 98 | |
| 99 | return; |
| 100 | } |
| 101 | |
| 102 | /* Supply the floating-point registers. */ |
| 103 | for (i = 0; i < 8; i++) |
| 104 | supply_register (FP0_REGNUM + i, ep->regs[i]); |
| 105 | |
| 106 | supply_register (FCTRL_REGNUM, (char *) &ep->control); |
| 107 | supply_register (FSTAT_REGNUM, (char *) &ep->status); |
| 108 | supply_register (FTAG_REGNUM, (char *) &ep->tag); |
| 109 | supply_register (FCOFF_REGNUM, (char *) &ep->eip); |
| 110 | supply_register (FDS_REGNUM, (char *) &ep->operand_seg); |
| 111 | supply_register (FDOFF_REGNUM, (char *) &ep->operand); |
| 112 | |
| 113 | /* Store the code segment and opcode pseudo registers. */ |
| 114 | { |
| 115 | long l; |
| 116 | |
| 117 | l = ep->code_seg; |
| 118 | supply_register (FCS_REGNUM, (char *) &l); |
| 119 | l = ep->opcode & ((1 << 11) - 1); |
| 120 | supply_register (FOP_REGNUM, (char *) &l); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | /* Fetch register REGNO, or all regs if REGNO is -1. */ |
| 125 | void |
| 126 | gnu_fetch_registers (int regno) |
| 127 | { |
| 128 | struct proc *thread; |
| 129 | |
| 130 | /* Make sure we know about new threads. */ |
| 131 | inf_update_procs (current_inferior); |
| 132 | |
| 133 | thread = inf_tid_to_thread (current_inferior, inferior_pid); |
| 134 | if (!thread) |
| 135 | error ("Can't fetch registers from thread %d: No such thread", |
| 136 | inferior_pid); |
| 137 | |
| 138 | if (regno < NUM_GREGS || regno == -1) |
| 139 | { |
| 140 | thread_state_t state; |
| 141 | |
| 142 | /* This does the dirty work for us. */ |
| 143 | state = proc_get_state (thread, 0); |
| 144 | if (!state) |
| 145 | { |
| 146 | warning ("Couldn't fetch registers from %s", |
| 147 | proc_string (thread)); |
| 148 | return; |
| 149 | } |
| 150 | |
| 151 | if (regno == -1) |
| 152 | { |
| 153 | int i; |
| 154 | |
| 155 | proc_debug (thread, "fetching all register"); |
| 156 | |
| 157 | for (i = 0; i < NUM_GREGS; i++) |
| 158 | supply_register (i, REG_ADDR (state, i)); |
| 159 | thread->fetched_regs = ~0; |
| 160 | } |
| 161 | else |
| 162 | { |
| 163 | proc_debug (thread, "fetching register %s", REGISTER_NAME (regno)); |
| 164 | |
| 165 | supply_register (regno, REG_ADDR (state, regno)); |
| 166 | thread->fetched_regs |= (1 << regno); |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | if (regno >= NUM_GREGS || regno == -1) |
| 171 | { |
| 172 | proc_debug (thread, "fetching floating-point registers"); |
| 173 | |
| 174 | fetch_fpregs (thread); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | \f |
| 179 | /* Fill the i387 hardware state EP with selected data from the set of |
| 180 | (pseudo) registers specified by REGS and VALID. VALID is an array |
| 181 | indicating which registers in REGS are valid. If VALID is zero, |
| 182 | all registers are assumed to be valid. */ |
| 183 | static void |
| 184 | convert_to_env387 (struct env387 *ep, char *regs, signed char *valid) |
| 185 | { |
| 186 | int i; |
| 187 | |
| 188 | /* Fill in the floating-point registers. */ |
| 189 | for (i = 0; i < 8; i++) |
| 190 | if (!valid || valid[i]) |
| 191 | memcpy (ep->regs[i], ®s[REGISTER_BYTE (FP0_REGNUM + i)], |
| 192 | REGISTER_RAW_SIZE (FP0_REGNUM + i)); |
| 193 | |
| 194 | #define fill(member, regno) \ |
| 195 | if (!valid || valid[(regno)]) \ |
| 196 | memcpy (&ep->member, ®s[REGISTER_BYTE (regno)], \ |
| 197 | sizeof (ep->member)); |
| 198 | |
| 199 | fill (control, FCTRL_REGNUM); |
| 200 | fill (status, FSTAT_REGNUM); |
| 201 | fill (tag, FTAG_REGNUM); |
| 202 | fill (eip, FCOFF_REGNUM); |
| 203 | fill (operand, FDOFF_REGNUM); |
| 204 | fill (operand_seg, FDS_REGNUM); |
| 205 | |
| 206 | #undef fill |
| 207 | |
| 208 | if (!valid || valid[FCS_REGNUM]) |
| 209 | ep->code_seg = |
| 210 | (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff); |
| 211 | |
| 212 | if (!valid || valid[FOP_REGNUM]) |
| 213 | ep->opcode = |
| 214 | ((* (int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1))); |
| 215 | } |
| 216 | |
| 217 | /* Store the whole floating-point state into THREAD using information |
| 218 | from the corresponding (pseudo) registers. */ |
| 219 | static void |
| 220 | store_fpregs (struct proc *thread) |
| 221 | { |
| 222 | mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; |
| 223 | struct i386_float_state state; |
| 224 | error_t err; |
| 225 | |
| 226 | err = thread_get_state (thread->port, i386_FLOAT_STATE, |
| 227 | (thread_state_t) &state, &count); |
| 228 | if (err) |
| 229 | { |
| 230 | warning ("Couldn't fetch floating-point state from %s", |
| 231 | proc_string (thread)); |
| 232 | return; |
| 233 | } |
| 234 | |
| 235 | convert_to_env387 ((struct env387 *) state.hw_state, |
| 236 | registers, register_valid); |
| 237 | |
| 238 | err = thread_set_state (thread->port, i386_FLOAT_STATE, |
| 239 | (thread_state_t) &state, i386_FLOAT_STATE_COUNT); |
| 240 | if (err) |
| 241 | { |
| 242 | warning ("Couldn't store floating-point state into %s", |
| 243 | proc_string (thread)); |
| 244 | return; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | /* Store at least register REGNO, or all regs if REGNO == -1. */ |
| 249 | void |
| 250 | gnu_store_registers (int regno) |
| 251 | { |
| 252 | struct proc *thread; |
| 253 | |
| 254 | /* Make sure we know about new threads. */ |
| 255 | inf_update_procs (current_inferior); |
| 256 | |
| 257 | thread = inf_tid_to_thread (current_inferior, inferior_pid); |
| 258 | if (!thread) |
| 259 | error ("Couldn't store registers into thread %d: No such thread", |
| 260 | inferior_pid); |
| 261 | |
| 262 | if (regno < NUM_GREGS || regno == -1) |
| 263 | { |
| 264 | thread_state_t state; |
| 265 | thread_state_data_t old_state; |
| 266 | int was_aborted = thread->aborted; |
| 267 | int was_valid = thread->state_valid; |
| 268 | int trace; |
| 269 | |
| 270 | if (!was_aborted && was_valid) |
| 271 | memcpy (&old_state, &thread->state, sizeof (old_state)); |
| 272 | |
| 273 | state = proc_get_state (thread, 1); |
| 274 | if (!state) |
| 275 | { |
| 276 | warning ("Couldn't store registers into %s", proc_string (thread)); |
| 277 | return; |
| 278 | } |
| 279 | |
| 280 | /* Save the T bit. We might try to restore the %eflags register |
| 281 | below, but changing the T bit would seriously confuse GDB. */ |
| 282 | trace = ((struct i386_thread_state *)state)->efl & 0x100; |
| 283 | |
| 284 | if (!was_aborted && was_valid) |
| 285 | /* See which registers have changed after aborting the thread. */ |
| 286 | { |
| 287 | int check_regno; |
| 288 | |
| 289 | for (check_regno = 0; check_regno < NUM_GREGS; check_regno++) |
| 290 | if ((thread->fetched_regs & (1 << check_regno)) |
| 291 | && memcpy (REG_ADDR (&old_state, check_regno), |
| 292 | REG_ADDR (state, check_regno), |
| 293 | REGISTER_RAW_SIZE (check_regno))) |
| 294 | /* Register CHECK_REGNO has changed! Ack! */ |
| 295 | { |
| 296 | warning ("Register %s changed after the thread was aborted", |
| 297 | REGISTER_NAME (check_regno)); |
| 298 | if (regno >= 0 && regno != check_regno) |
| 299 | /* Update gdb's copy of the register. */ |
| 300 | supply_register (check_regno, REG_ADDR (state, check_regno)); |
| 301 | else |
| 302 | warning ("... also writing this register! Suspicious..."); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | #define fill(state, regno) \ |
| 307 | memcpy (REG_ADDR(state, regno), ®isters[REGISTER_BYTE (regno)], \ |
| 308 | REGISTER_RAW_SIZE (regno)) |
| 309 | |
| 310 | if (regno == -1) |
| 311 | { |
| 312 | int i; |
| 313 | |
| 314 | proc_debug (thread, "storing all registers"); |
| 315 | |
| 316 | for (i = 0; i < NUM_GREGS; i++) |
| 317 | if (register_valid[i]) |
| 318 | fill (state, i); |
| 319 | } |
| 320 | else |
| 321 | { |
| 322 | proc_debug (thread, "storing register %s", REGISTER_NAME (regno)); |
| 323 | |
| 324 | gdb_assert (register_valid[regno]); |
| 325 | fill (state, regno); |
| 326 | } |
| 327 | |
| 328 | /* Restore the T bit. */ |
| 329 | ((struct i386_thread_state *)state)->efl &= ~0x100; |
| 330 | ((struct i386_thread_state *)state)->efl |= trace; |
| 331 | } |
| 332 | |
| 333 | #undef fill |
| 334 | |
| 335 | if (regno >= NUM_GREGS || regno == -1) |
| 336 | { |
| 337 | proc_debug (thread, "storing floating-point registers"); |
| 338 | |
| 339 | store_fpregs (thread); |
| 340 | } |
| 341 | } |