1 /* Low level interface to i386 running the GNU Hurd.
3 Copyright (C) 1992-2019 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 /* Include this first, to pick up the <mach.h> 'thread_info' diversion. */
23 /* Mach/Hurd headers are not yet ready for C++ compilation. */
27 #include <mach_error.h>
28 #include <mach/message.h>
29 #include <mach/exception.h>
35 #include "floatformat.h"
38 #include "i386-tdep.h"
40 #include "inf-child.h"
41 #include "i387-tdep.h"
43 /* Offset to the thread_state_t location where REG is stored. */
44 #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
46 /* At REG_OFFSET[N] is the offset to the thread_state_t location where
47 the GDB register N is stored. */
48 static int reg_offset[] =
50 REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx),
51 REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi),
52 REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss),
53 REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs)
56 #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
60 /* The i386 GNU Hurd target. */
62 #ifdef i386_DEBUG_STATE
63 using gnu_base_target = x86_nat_target<gnu_nat_target>;
65 using gnu_base_target = gnu_nat_target;
68 struct i386_gnu_nat_target final : public gnu_base_target
70 void fetch_registers (struct regcache *, int) override;
71 void store_registers (struct regcache *, int) override;
74 static i386_gnu_nat_target the_i386_gnu_nat_target;
76 /* Get the whole floating-point state of THREAD and record the values
77 of the corresponding (pseudo) registers. */
80 fetch_fpregs (struct regcache *regcache, struct proc *thread)
82 mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
83 struct i386_float_state state;
86 err = thread_get_state (thread->port, i386_FLOAT_STATE,
87 (thread_state_t) &state, &count);
90 warning (_("Couldn't fetch floating-point state from %s"),
91 proc_string (thread));
95 if (!state.initialized)
97 /* The floating-point state isn't initialized. */
98 i387_supply_fsave (regcache, -1, NULL);
102 /* Supply the floating-point registers. */
103 i387_supply_fsave (regcache, -1, state.hw_state);
107 /* Fetch register REGNO, or all regs if REGNO is -1. */
109 gnu_fetch_registers (struct target_ops *ops,
110 struct regcache *regcache, int regno)
113 ptid_t ptid = regcache->ptid ();
115 /* Make sure we know about new threads. */
116 inf_update_procs (gnu_current_inf);
118 thread = inf_tid_to_thread (gnu_current_inf, ptid.lwp ());
120 error (_("Can't fetch registers from thread %s: No such thread"),
121 target_pid_to_str (ptid));
123 if (regno < I386_NUM_GREGS || regno == -1)
125 thread_state_t state;
127 /* This does the dirty work for us. */
128 state = proc_get_state (thread, 0);
131 warning (_("Couldn't fetch registers from %s"),
132 proc_string (thread));
140 proc_debug (thread, "fetching all register");
142 for (i = 0; i < I386_NUM_GREGS; i++)
143 regcache->raw_supply (i, REG_ADDR (state, i));
144 thread->fetched_regs = ~0;
148 proc_debug (thread, "fetching register %s",
149 gdbarch_register_name (regcache->arch (),
152 regcache->raw_supply (regno, REG_ADDR (state, regno));
153 thread->fetched_regs |= (1 << regno);
157 if (regno >= I386_NUM_GREGS || regno == -1)
159 proc_debug (thread, "fetching floating-point registers");
161 fetch_fpregs (regcache, thread);
166 /* Store the whole floating-point state into THREAD using information
167 from the corresponding (pseudo) registers. */
169 store_fpregs (const struct regcache *regcache, struct proc *thread, int regno)
171 mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
172 struct i386_float_state state;
175 err = thread_get_state (thread->port, i386_FLOAT_STATE,
176 (thread_state_t) &state, &count);
179 warning (_("Couldn't fetch floating-point state from %s"),
180 proc_string (thread));
184 /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
185 take into account DEPRECATED_REGISTER_VALID like the old code did? */
186 i387_collect_fsave (regcache, regno, state.hw_state);
188 err = thread_set_state (thread->port, i386_FLOAT_STATE,
189 (thread_state_t) &state, i386_FLOAT_STATE_COUNT);
192 warning (_("Couldn't store floating-point state into %s"),
193 proc_string (thread));
198 /* Store at least register REGNO, or all regs if REGNO == -1. */
200 gnu_store_registers (struct target_ops *ops,
201 struct regcache *regcache, int regno)
204 struct gdbarch *gdbarch = regcache->arch ();
205 ptid_t ptid = regcache->ptid ();
207 /* Make sure we know about new threads. */
208 inf_update_procs (gnu_current_inf);
210 thread = inf_tid_to_thread (gnu_current_inf, ptid.lwp ());
212 error (_("Couldn't store registers into thread %s: No such thread"),
213 target_pid_to_str (ptid));
215 if (regno < I386_NUM_GREGS || regno == -1)
217 thread_state_t state;
218 thread_state_data_t old_state;
219 int was_aborted = thread->aborted;
220 int was_valid = thread->state_valid;
223 if (!was_aborted && was_valid)
224 memcpy (&old_state, &thread->state, sizeof (old_state));
226 state = proc_get_state (thread, 1);
229 warning (_("Couldn't store registers into %s"),
230 proc_string (thread));
234 /* Save the T bit. We might try to restore the %eflags register
235 below, but changing the T bit would seriously confuse GDB. */
236 trace = ((struct i386_thread_state *)state)->efl & 0x100;
238 if (!was_aborted && was_valid)
239 /* See which registers have changed after aborting the thread. */
243 for (check_regno = 0; check_regno < I386_NUM_GREGS; check_regno++)
244 if ((thread->fetched_regs & (1 << check_regno))
245 && memcpy (REG_ADDR (&old_state, check_regno),
246 REG_ADDR (state, check_regno),
247 register_size (gdbarch, check_regno)))
248 /* Register CHECK_REGNO has changed! Ack! */
250 warning (_("Register %s changed after the thread was aborted"),
251 gdbarch_register_name (gdbarch, check_regno));
252 if (regno >= 0 && regno != check_regno)
253 /* Update GDB's copy of the register. */
254 regcache->raw_supply (check_regno,
255 REG_ADDR (state, check_regno));
257 warning (_("... also writing this register! "
266 proc_debug (thread, "storing all registers");
268 for (i = 0; i < I386_NUM_GREGS; i++)
269 if (REG_VALID == regcache->get_register_status (i))
270 regcache->raw_collect (i, REG_ADDR (state, i));
274 proc_debug (thread, "storing register %s",
275 gdbarch_register_name (gdbarch, regno));
277 gdb_assert (REG_VALID == regcache->get_register_status (regno));
278 regcache->raw_collect (regno, REG_ADDR (state, regno));
281 /* Restore the T bit. */
282 ((struct i386_thread_state *)state)->efl &= ~0x100;
283 ((struct i386_thread_state *)state)->efl |= trace;
286 if (regno >= I386_NUM_GREGS || regno == -1)
288 proc_debug (thread, "storing floating-point registers");
290 store_fpregs (regcache, thread, regno);
295 /* Support for debug registers. */
297 #ifdef i386_DEBUG_STATE
298 /* Get debug registers for thread THREAD. */
301 i386_gnu_dr_get (struct i386_debug_state *regs, struct proc *thread)
303 mach_msg_type_number_t count = i386_DEBUG_STATE_COUNT;
306 err = thread_get_state (thread->port, i386_DEBUG_STATE,
307 (thread_state_t) regs, &count);
308 if (err != 0 || count != i386_DEBUG_STATE_COUNT)
309 warning (_("Couldn't fetch debug state from %s"),
310 proc_string (thread));
313 /* Set debug registers for thread THREAD. */
316 i386_gnu_dr_set (const struct i386_debug_state *regs, struct proc *thread)
320 err = thread_set_state (thread->port, i386_DEBUG_STATE,
321 (thread_state_t) regs, i386_DEBUG_STATE_COUNT);
323 warning (_("Couldn't store debug state into %s"),
324 proc_string (thread));
327 /* Set DR_CONTROL in THREAD. */
330 i386_gnu_dr_set_control_one (struct proc *thread, void *arg)
332 unsigned long *control = (unsigned long *) arg;
333 struct i386_debug_state regs;
335 i386_gnu_dr_get (®s, thread);
336 regs.dr[DR_CONTROL] = *control;
337 i386_gnu_dr_set (®s, thread);
340 /* Set DR_CONTROL to CONTROL in all threads. */
343 i386_gnu_dr_set_control (unsigned long control)
345 inf_update_procs (gnu_current_inf);
346 inf_threads (gnu_current_inf, i386_gnu_dr_set_control_one, &control);
349 /* Parameters to set a debugging address. */
353 int regnum; /* Register number (zero based). */
354 CORE_ADDR addr; /* Address. */
357 /* Set address REGNUM (zero based) to ADDR in THREAD. */
360 i386_gnu_dr_set_addr_one (struct proc *thread, void *arg)
362 struct reg_addr *reg_addr = (struct reg_addr *) arg;
363 struct i386_debug_state regs;
365 i386_gnu_dr_get (®s, thread);
366 regs.dr[reg_addr->regnum] = reg_addr->addr;
367 i386_gnu_dr_set (®s, thread);
370 /* Set address REGNUM (zero based) to ADDR in all threads. */
373 i386_gnu_dr_set_addr (int regnum, CORE_ADDR addr)
375 struct reg_addr reg_addr;
377 gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
379 reg_addr.regnum = regnum;
380 reg_addr.addr = addr;
382 inf_update_procs (gnu_current_inf);
383 inf_threads (gnu_current_inf, i386_gnu_dr_set_addr_one, ®_addr);
386 /* Get debug register REGNUM value from only the one LWP of PTID. */
389 i386_gnu_dr_get_reg (ptid_t ptid, int regnum)
391 struct i386_debug_state regs;
394 /* Make sure we know about new threads. */
395 inf_update_procs (gnu_current_inf);
397 thread = inf_tid_to_thread (gnu_current_inf, ptid.lwp ());
398 i386_gnu_dr_get (®s, thread);
400 return regs.dr[regnum];
403 /* Return the inferior's debug register REGNUM. */
406 i386_gnu_dr_get_addr (int regnum)
408 gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
410 return i386_gnu_dr_get_reg (inferior_ptid, regnum);
413 /* Get DR_STATUS from only the one thread of INFERIOR_PTID. */
416 i386_gnu_dr_get_status (void)
418 return i386_gnu_dr_get_reg (inferior_ptid, DR_STATUS);
421 /* Return the inferior's DR7 debug control register. */
424 i386_gnu_dr_get_control (void)
426 return i386_gnu_dr_get_reg (inferior_ptid, DR_CONTROL);
428 #endif /* i386_DEBUG_STATE */
431 _initialize_i386gnu_nat (void)
433 #ifdef i386_DEBUG_STATE
434 x86_dr_low.set_control = i386_gnu_dr_set_control;
435 gdb_assert (DR_FIRSTADDR == 0 && DR_LASTADDR < i386_DEBUG_STATE_COUNT);
436 x86_dr_low.set_addr = i386_gnu_dr_set_addr;
437 x86_dr_low.get_addr = i386_gnu_dr_get_addr;
438 x86_dr_low.get_status = i386_gnu_dr_get_status;
439 x86_dr_low.get_control = i386_gnu_dr_get_control;
440 x86_set_debug_register_length (4);
441 #endif /* i386_DEBUG_STATE */
443 /* Register the target. */
444 add_inf_child_target (&the_i386_gnu_nat_target);