1 /* Low level interface to i386 running the GNU Hurd.
3 Copyright (C) 1992, 1995, 1996, 1998, 2000, 2001, 2004, 2007, 2008, 2009,
4 2010, 2011 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "floatformat.h"
26 #include "gdb_assert.h"
29 #include "gdb_string.h"
32 #include <mach_error.h>
33 #include <mach/message.h>
34 #include <mach/exception.h>
36 #include "i386-tdep.h"
39 #include "i387-tdep.h"
41 #ifdef HAVE_SYS_PROCFS_H
42 # include <sys/procfs.h>
46 /* Offset to the thread_state_t location where REG is stored. */
47 #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
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[] =
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)
59 #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
60 #define CREG_ADDR(state, regnum) ((const char *)(state) + reg_offset[regnum])
63 /* Get the whole floating-point state of THREAD and record the values
64 of the corresponding (pseudo) registers. */
67 fetch_fpregs (struct regcache *regcache, struct proc *thread)
69 mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
70 struct i386_float_state state;
73 err = thread_get_state (thread->port, i386_FLOAT_STATE,
74 (thread_state_t) &state, &count);
77 warning (_("Couldn't fetch floating-point state from %s"),
78 proc_string (thread));
82 if (!state.initialized)
84 /* The floating-point state isn't initialized. */
85 i387_supply_fsave (regcache, -1, NULL);
89 /* Supply the floating-point registers. */
90 i387_supply_fsave (regcache, -1, state.hw_state);
94 #ifdef HAVE_SYS_PROCFS_H
95 /* These two calls are used by the core-regset.c code for
96 reading ELF core files. */
98 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregs)
101 for (i = 0; i < I386_NUM_GREGS; i++)
102 regcache_raw_supply (regcache, i, CREG_ADDR (gregs, i));
106 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)
108 i387_supply_fsave (regcache, -1, fpregs);
112 /* Fetch register REGNO, or all regs if REGNO is -1. */
114 gnu_fetch_registers (struct target_ops *ops,
115 struct regcache *regcache, int regno)
119 /* Make sure we know about new threads. */
120 inf_update_procs (gnu_current_inf);
122 thread = inf_tid_to_thread (gnu_current_inf,
123 ptid_get_tid (inferior_ptid));
125 error (_("Can't fetch registers from thread %s: No such thread"),
126 target_pid_to_str (inferior_ptid));
128 if (regno < I386_NUM_GREGS || regno == -1)
130 thread_state_t state;
132 /* This does the dirty work for us. */
133 state = proc_get_state (thread, 0);
136 warning (_("Couldn't fetch registers from %s"),
137 proc_string (thread));
145 proc_debug (thread, "fetching all register");
147 for (i = 0; i < I386_NUM_GREGS; i++)
148 regcache_raw_supply (regcache, i, REG_ADDR (state, i));
149 thread->fetched_regs = ~0;
153 proc_debug (thread, "fetching register %s",
154 gdbarch_register_name (get_regcache_arch (regcache),
157 regcache_raw_supply (regcache, regno,
158 REG_ADDR (state, regno));
159 thread->fetched_regs |= (1 << regno);
163 if (regno >= I386_NUM_GREGS || regno == -1)
165 proc_debug (thread, "fetching floating-point registers");
167 fetch_fpregs (regcache, thread);
172 /* Store the whole floating-point state into THREAD using information
173 from the corresponding (pseudo) registers. */
175 store_fpregs (const struct regcache *regcache, struct proc *thread, int regno)
177 mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
178 struct i386_float_state state;
181 err = thread_get_state (thread->port, i386_FLOAT_STATE,
182 (thread_state_t) &state, &count);
185 warning (_("Couldn't fetch floating-point state from %s"),
186 proc_string (thread));
190 /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
191 take into account DEPRECATED_REGISTER_VALID like the old code did? */
192 i387_collect_fsave (regcache, regno, state.hw_state);
194 err = thread_set_state (thread->port, i386_FLOAT_STATE,
195 (thread_state_t) &state, i386_FLOAT_STATE_COUNT);
198 warning (_("Couldn't store floating-point state into %s"),
199 proc_string (thread));
204 /* Store at least register REGNO, or all regs if REGNO == -1. */
206 gnu_store_registers (struct target_ops *ops,
207 struct regcache *regcache, int regno)
210 struct gdbarch *gdbarch = get_regcache_arch (regcache);
212 /* Make sure we know about new threads. */
213 inf_update_procs (gnu_current_inf);
215 thread = inf_tid_to_thread (gnu_current_inf,
216 ptid_get_tid (inferior_ptid));
218 error (_("Couldn't store registers into thread %s: No such thread"),
219 target_pid_to_str (inferior_ptid));
221 if (regno < I386_NUM_GREGS || regno == -1)
223 thread_state_t state;
224 thread_state_data_t old_state;
225 int was_aborted = thread->aborted;
226 int was_valid = thread->state_valid;
229 if (!was_aborted && was_valid)
230 memcpy (&old_state, &thread->state, sizeof (old_state));
232 state = proc_get_state (thread, 1);
235 warning (_("Couldn't store registers into %s"),
236 proc_string (thread));
240 /* Save the T bit. We might try to restore the %eflags register
241 below, but changing the T bit would seriously confuse GDB. */
242 trace = ((struct i386_thread_state *)state)->efl & 0x100;
244 if (!was_aborted && was_valid)
245 /* See which registers have changed after aborting the thread. */
249 for (check_regno = 0; check_regno < I386_NUM_GREGS; check_regno++)
250 if ((thread->fetched_regs & (1 << check_regno))
251 && memcpy (REG_ADDR (&old_state, check_regno),
252 REG_ADDR (state, check_regno),
253 register_size (gdbarch, check_regno)))
254 /* Register CHECK_REGNO has changed! Ack! */
256 warning (_("Register %s changed after the thread was aborted"),
257 gdbarch_register_name (gdbarch, check_regno));
258 if (regno >= 0 && regno != check_regno)
259 /* Update GDB's copy of the register. */
260 regcache_raw_supply (regcache, check_regno,
261 REG_ADDR (state, check_regno));
263 warning (_("... also writing this register! "
272 proc_debug (thread, "storing all registers");
274 for (i = 0; i < I386_NUM_GREGS; i++)
275 if (regcache_valid_p (regcache, i))
276 regcache_raw_collect (regcache, i, REG_ADDR (state, i));
280 proc_debug (thread, "storing register %s",
281 gdbarch_register_name (gdbarch, regno));
283 gdb_assert (regcache_valid_p (regcache, regno));
284 regcache_raw_collect (regcache, regno, REG_ADDR (state, regno));
287 /* Restore the T bit. */
288 ((struct i386_thread_state *)state)->efl &= ~0x100;
289 ((struct i386_thread_state *)state)->efl |= trace;
292 if (regno >= I386_NUM_GREGS || regno == -1)
294 proc_debug (thread, "storing floating-point registers");
296 store_fpregs (regcache, thread, regno);
300 /* Provide a prototype to silence -Wmissing-prototypes. */
301 extern initialize_file_ftype _initialize_i386gnu_nat;
304 _initialize_i386gnu_nat (void)
306 struct target_ops *t;
308 /* Fill in the generic GNU/Hurd methods. */
311 t->to_fetch_registers = gnu_fetch_registers;
312 t->to_store_registers = gnu_store_registers;
314 /* Register the target. */