1 /* Low level interface to i386 running the GNU Hurd.
3 Copyright (C) 1992-2018 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 /* Mach/Hurd headers are not yet ready for C++ compilation. */
24 #include <mach_error.h>
25 #include <mach/message.h>
26 #include <mach/exception.h>
32 #include "floatformat.h"
35 #include "i386-tdep.h"
38 #include "inf-child.h"
39 #include "i387-tdep.h"
41 /* Offset to the thread_state_t location where REG is stored. */
42 #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
44 /* At REG_OFFSET[N] is the offset to the thread_state_t location where
45 the GDB register N is stored. */
46 static int reg_offset[] =
48 REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx),
49 REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi),
50 REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss),
51 REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs)
54 #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
58 /* The i386 GNU Hurd target. */
60 #ifdef i386_DEBUG_STATE
61 using gnu_base_target = x86_nat_target<gnu_nat_target>;
63 using gnu_base_target = gnu_nat_target;
66 struct i386_gnu_nat_target final : public gnu_base_target
68 void fetch_registers (struct regcache *, int) override;
69 void store_registers (struct regcache *, int) override;
72 static i386_gnu_nat_target the_i386_gnu_nat_target;
74 /* Get the whole floating-point state of THREAD and record the values
75 of the corresponding (pseudo) registers. */
78 fetch_fpregs (struct regcache *regcache, struct proc *thread)
80 mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
81 struct i386_float_state state;
84 err = thread_get_state (thread->port, i386_FLOAT_STATE,
85 (thread_state_t) &state, &count);
88 warning (_("Couldn't fetch floating-point state from %s"),
89 proc_string (thread));
93 if (!state.initialized)
95 /* The floating-point state isn't initialized. */
96 i387_supply_fsave (regcache, -1, NULL);
100 /* Supply the floating-point registers. */
101 i387_supply_fsave (regcache, -1, state.hw_state);
105 /* Fetch register REGNO, or all regs if REGNO is -1. */
107 gnu_fetch_registers (struct target_ops *ops,
108 struct regcache *regcache, int regno)
111 ptid_t ptid = regcache->ptid ();
113 /* Make sure we know about new threads. */
114 inf_update_procs (gnu_current_inf);
116 thread = inf_tid_to_thread (gnu_current_inf, ptid_get_lwp (ptid));
118 error (_("Can't fetch registers from thread %s: No such thread"),
119 target_pid_to_str (ptid));
121 if (regno < I386_NUM_GREGS || regno == -1)
123 thread_state_t state;
125 /* This does the dirty work for us. */
126 state = proc_get_state (thread, 0);
129 warning (_("Couldn't fetch registers from %s"),
130 proc_string (thread));
138 proc_debug (thread, "fetching all register");
140 for (i = 0; i < I386_NUM_GREGS; i++)
141 regcache_raw_supply (regcache, i, REG_ADDR (state, i));
142 thread->fetched_regs = ~0;
146 proc_debug (thread, "fetching register %s",
147 gdbarch_register_name (regcache->arch (),
150 regcache_raw_supply (regcache, regno,
151 REG_ADDR (state, regno));
152 thread->fetched_regs |= (1 << regno);
156 if (regno >= I386_NUM_GREGS || regno == -1)
158 proc_debug (thread, "fetching floating-point registers");
160 fetch_fpregs (regcache, thread);
165 /* Store the whole floating-point state into THREAD using information
166 from the corresponding (pseudo) registers. */
168 store_fpregs (const struct regcache *regcache, struct proc *thread, int regno)
170 mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
171 struct i386_float_state state;
174 err = thread_get_state (thread->port, i386_FLOAT_STATE,
175 (thread_state_t) &state, &count);
178 warning (_("Couldn't fetch floating-point state from %s"),
179 proc_string (thread));
183 /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
184 take into account DEPRECATED_REGISTER_VALID like the old code did? */
185 i387_collect_fsave (regcache, regno, state.hw_state);
187 err = thread_set_state (thread->port, i386_FLOAT_STATE,
188 (thread_state_t) &state, i386_FLOAT_STATE_COUNT);
191 warning (_("Couldn't store floating-point state into %s"),
192 proc_string (thread));
197 /* Store at least register REGNO, or all regs if REGNO == -1. */
199 gnu_store_registers (struct target_ops *ops,
200 struct regcache *regcache, int regno)
203 struct gdbarch *gdbarch = regcache->arch ();
204 ptid_t ptid = regcache->ptid ();
206 /* Make sure we know about new threads. */
207 inf_update_procs (gnu_current_inf);
209 thread = inf_tid_to_thread (gnu_current_inf, ptid_get_lwp (ptid));
211 error (_("Couldn't store registers into thread %s: No such thread"),
212 target_pid_to_str (ptid));
214 if (regno < I386_NUM_GREGS || regno == -1)
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;
222 if (!was_aborted && was_valid)
223 memcpy (&old_state, &thread->state, sizeof (old_state));
225 state = proc_get_state (thread, 1);
228 warning (_("Couldn't store registers into %s"),
229 proc_string (thread));
233 /* Save the T bit. We might try to restore the %eflags register
234 below, but changing the T bit would seriously confuse GDB. */
235 trace = ((struct i386_thread_state *)state)->efl & 0x100;
237 if (!was_aborted && was_valid)
238 /* See which registers have changed after aborting the thread. */
242 for (check_regno = 0; check_regno < I386_NUM_GREGS; check_regno++)
243 if ((thread->fetched_regs & (1 << check_regno))
244 && memcpy (REG_ADDR (&old_state, check_regno),
245 REG_ADDR (state, check_regno),
246 register_size (gdbarch, check_regno)))
247 /* Register CHECK_REGNO has changed! Ack! */
249 warning (_("Register %s changed after the thread was aborted"),
250 gdbarch_register_name (gdbarch, check_regno));
251 if (regno >= 0 && regno != check_regno)
252 /* Update GDB's copy of the register. */
253 regcache_raw_supply (regcache, check_regno,
254 REG_ADDR (state, check_regno));
256 warning (_("... also writing this register! "
265 proc_debug (thread, "storing all registers");
267 for (i = 0; i < I386_NUM_GREGS; i++)
268 if (REG_VALID == regcache->get_register_status (i))
269 regcache_raw_collect (regcache, i, REG_ADDR (state, i));
273 proc_debug (thread, "storing register %s",
274 gdbarch_register_name (gdbarch, regno));
276 gdb_assert (REG_VALID == regcache->get_register_status (regno));
277 regcache_raw_collect (regcache, regno, REG_ADDR (state, regno));
280 /* Restore the T bit. */
281 ((struct i386_thread_state *)state)->efl &= ~0x100;
282 ((struct i386_thread_state *)state)->efl |= trace;
285 if (regno >= I386_NUM_GREGS || regno == -1)
287 proc_debug (thread, "storing floating-point registers");
289 store_fpregs (regcache, thread, regno);
294 /* Support for debug registers. */
296 #ifdef i386_DEBUG_STATE
297 /* Get debug registers for thread THREAD. */
300 i386_gnu_dr_get (struct i386_debug_state *regs, struct proc *thread)
302 mach_msg_type_number_t count = i386_DEBUG_STATE_COUNT;
305 err = thread_get_state (thread->port, i386_DEBUG_STATE,
306 (thread_state_t) regs, &count);
307 if (err != 0 || count != i386_DEBUG_STATE_COUNT)
308 warning (_("Couldn't fetch debug state from %s"),
309 proc_string (thread));
312 /* Set debug registers for thread THREAD. */
315 i386_gnu_dr_set (const struct i386_debug_state *regs, struct proc *thread)
319 err = thread_set_state (thread->port, i386_DEBUG_STATE,
320 (thread_state_t) regs, i386_DEBUG_STATE_COUNT);
322 warning (_("Couldn't store debug state into %s"),
323 proc_string (thread));
326 /* Set DR_CONTROL in THREAD. */
329 i386_gnu_dr_set_control_one (struct proc *thread, void *arg)
331 unsigned long *control = (unsigned long *) arg;
332 struct i386_debug_state regs;
334 i386_gnu_dr_get (®s, thread);
335 regs.dr[DR_CONTROL] = *control;
336 i386_gnu_dr_set (®s, thread);
339 /* Set DR_CONTROL to CONTROL in all threads. */
342 i386_gnu_dr_set_control (unsigned long control)
344 inf_update_procs (gnu_current_inf);
345 inf_threads (gnu_current_inf, i386_gnu_dr_set_control_one, &control);
348 /* Parameters to set a debugging address. */
352 int regnum; /* Register number (zero based). */
353 CORE_ADDR addr; /* Address. */
356 /* Set address REGNUM (zero based) to ADDR in THREAD. */
359 i386_gnu_dr_set_addr_one (struct proc *thread, void *arg)
361 struct reg_addr *reg_addr = (struct reg_addr *) arg;
362 struct i386_debug_state regs;
364 i386_gnu_dr_get (®s, thread);
365 regs.dr[reg_addr->regnum] = reg_addr->addr;
366 i386_gnu_dr_set (®s, thread);
369 /* Set address REGNUM (zero based) to ADDR in all threads. */
372 i386_gnu_dr_set_addr (int regnum, CORE_ADDR addr)
374 struct reg_addr reg_addr;
376 gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
378 reg_addr.regnum = regnum;
379 reg_addr.addr = addr;
381 inf_update_procs (gnu_current_inf);
382 inf_threads (gnu_current_inf, i386_gnu_dr_set_addr_one, ®_addr);
385 /* Get debug register REGNUM value from only the one LWP of PTID. */
388 i386_gnu_dr_get_reg (ptid_t ptid, int regnum)
390 struct i386_debug_state regs;
393 /* Make sure we know about new threads. */
394 inf_update_procs (gnu_current_inf);
396 thread = inf_tid_to_thread (gnu_current_inf, ptid_get_lwp (ptid));
397 i386_gnu_dr_get (®s, thread);
399 return regs.dr[regnum];
402 /* Return the inferior's debug register REGNUM. */
405 i386_gnu_dr_get_addr (int regnum)
407 gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
409 return i386_gnu_dr_get_reg (inferior_ptid, regnum);
412 /* Get DR_STATUS from only the one thread of INFERIOR_PTID. */
415 i386_gnu_dr_get_status (void)
417 return i386_gnu_dr_get_reg (inferior_ptid, DR_STATUS);
420 /* Return the inferior's DR7 debug control register. */
423 i386_gnu_dr_get_control (void)
425 return i386_gnu_dr_get_reg (inferior_ptid, DR_CONTROL);
427 #endif /* i386_DEBUG_STATE */
430 _initialize_i386gnu_nat (void)
432 #ifdef i386_DEBUG_STATE
433 x86_dr_low.set_control = i386_gnu_dr_set_control;
434 gdb_assert (DR_FIRSTADDR == 0 && DR_LASTADDR < i386_DEBUG_STATE_COUNT);
435 x86_dr_low.set_addr = i386_gnu_dr_set_addr;
436 x86_dr_low.get_addr = i386_gnu_dr_get_addr;
437 x86_dr_low.get_status = i386_gnu_dr_get_status;
438 x86_dr_low.get_control = i386_gnu_dr_get_control;
439 x86_set_debug_register_length (4);
440 #endif /* i386_DEBUG_STATE */
442 /* Register the target. */
443 add_inf_child_target (&the_i386_gnu_nat_target);