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329 lines
9.2 KiB
C
329 lines
9.2 KiB
C
/* Low level interface to i386 running the GNU Hurd.
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Copyright (C) 1992-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"
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#include "floatformat.h"
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#include "regcache.h"
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#include "gdb_assert.h"
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <mach.h>
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#include <mach_error.h>
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#include <mach/message.h>
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#include <mach/exception.h>
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#include "i386-tdep.h"
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#include "gnu-nat.h"
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#include "i387-tdep.h"
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#ifdef HAVE_SYS_PROCFS_H
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# include <sys/procfs.h>
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# include "gregset.h"
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#endif
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/* Offset to the thread_state_t location where REG is stored. */
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#define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
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/* At REG_OFFSET[N] is the offset to the thread_state_t location where
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the GDB register N is stored. */
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static int reg_offset[] =
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{
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REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx),
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REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi),
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REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss),
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REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs)
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};
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/* Offset to the greg_t location where REG is stored. */
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#define CREG_OFFSET(reg) (REG_##reg * 4)
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/* At CREG_OFFSET[N] is the offset to the greg_t location where
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the GDB register N is stored. */
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static int creg_offset[] =
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{
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CREG_OFFSET (EAX), CREG_OFFSET (ECX), CREG_OFFSET (EDX), CREG_OFFSET (EBX),
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CREG_OFFSET (UESP), CREG_OFFSET (EBP), CREG_OFFSET (ESI), CREG_OFFSET (EDI),
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CREG_OFFSET (EIP), CREG_OFFSET (EFL), CREG_OFFSET (CS), CREG_OFFSET (SS),
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CREG_OFFSET (DS), CREG_OFFSET (ES), CREG_OFFSET (FS), CREG_OFFSET (GS)
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};
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#define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
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#define CREG_ADDR(state, regnum) ((const char *)(state) + creg_offset[regnum])
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/* Get the whole floating-point state of THREAD and record the values
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of the corresponding (pseudo) registers. */
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static void
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fetch_fpregs (struct regcache *regcache, struct proc *thread)
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{
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mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
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struct i386_float_state state;
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error_t err;
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err = thread_get_state (thread->port, i386_FLOAT_STATE,
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(thread_state_t) &state, &count);
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if (err)
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{
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warning (_("Couldn't fetch floating-point state from %s"),
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proc_string (thread));
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return;
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}
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if (!state.initialized)
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{
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/* The floating-point state isn't initialized. */
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i387_supply_fsave (regcache, -1, NULL);
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}
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else
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{
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/* Supply the floating-point registers. */
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i387_supply_fsave (regcache, -1, state.hw_state);
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}
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}
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#ifdef HAVE_SYS_PROCFS_H
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/* These two calls are used by the core-regset.c code for
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reading ELF core files. */
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void
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supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregs)
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{
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int i;
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for (i = 0; i < I386_NUM_GREGS; i++)
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regcache_raw_supply (regcache, i, CREG_ADDR (gregs, i));
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}
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void
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supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)
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{
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i387_supply_fsave (regcache, -1, fpregs);
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}
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#endif
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/* Fetch register REGNO, or all regs if REGNO is -1. */
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static void
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gnu_fetch_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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struct proc *thread;
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/* Make sure we know about new threads. */
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inf_update_procs (gnu_current_inf);
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thread = inf_tid_to_thread (gnu_current_inf,
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ptid_get_lwp (inferior_ptid));
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if (!thread)
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error (_("Can't fetch registers from thread %s: No such thread"),
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target_pid_to_str (inferior_ptid));
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if (regno < I386_NUM_GREGS || regno == -1)
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{
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thread_state_t state;
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/* This does the dirty work for us. */
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state = proc_get_state (thread, 0);
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if (!state)
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{
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warning (_("Couldn't fetch registers from %s"),
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proc_string (thread));
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return;
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}
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if (regno == -1)
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{
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int i;
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proc_debug (thread, "fetching all register");
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for (i = 0; i < I386_NUM_GREGS; i++)
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regcache_raw_supply (regcache, i, REG_ADDR (state, i));
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thread->fetched_regs = ~0;
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}
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else
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{
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proc_debug (thread, "fetching register %s",
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gdbarch_register_name (get_regcache_arch (regcache),
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regno));
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regcache_raw_supply (regcache, regno,
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REG_ADDR (state, regno));
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thread->fetched_regs |= (1 << regno);
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}
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}
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if (regno >= I386_NUM_GREGS || regno == -1)
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{
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proc_debug (thread, "fetching floating-point registers");
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fetch_fpregs (regcache, thread);
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}
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}
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/* Store the whole floating-point state into THREAD using information
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from the corresponding (pseudo) registers. */
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static void
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store_fpregs (const struct regcache *regcache, struct proc *thread, int regno)
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{
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mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
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struct i386_float_state state;
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error_t err;
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err = thread_get_state (thread->port, i386_FLOAT_STATE,
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(thread_state_t) &state, &count);
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if (err)
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{
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warning (_("Couldn't fetch floating-point state from %s"),
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proc_string (thread));
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return;
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}
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/* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
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take into account DEPRECATED_REGISTER_VALID like the old code did? */
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i387_collect_fsave (regcache, regno, state.hw_state);
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err = thread_set_state (thread->port, i386_FLOAT_STATE,
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(thread_state_t) &state, i386_FLOAT_STATE_COUNT);
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if (err)
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{
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warning (_("Couldn't store floating-point state into %s"),
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proc_string (thread));
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return;
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}
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}
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/* Store at least register REGNO, or all regs if REGNO == -1. */
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static void
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gnu_store_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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struct proc *thread;
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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/* Make sure we know about new threads. */
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inf_update_procs (gnu_current_inf);
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thread = inf_tid_to_thread (gnu_current_inf,
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ptid_get_lwp (inferior_ptid));
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if (!thread)
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error (_("Couldn't store registers into thread %s: No such thread"),
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target_pid_to_str (inferior_ptid));
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if (regno < I386_NUM_GREGS || regno == -1)
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{
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thread_state_t state;
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thread_state_data_t old_state;
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int was_aborted = thread->aborted;
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int was_valid = thread->state_valid;
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int trace;
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if (!was_aborted && was_valid)
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memcpy (&old_state, &thread->state, sizeof (old_state));
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state = proc_get_state (thread, 1);
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if (!state)
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{
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warning (_("Couldn't store registers into %s"),
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proc_string (thread));
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return;
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}
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/* Save the T bit. We might try to restore the %eflags register
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below, but changing the T bit would seriously confuse GDB. */
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trace = ((struct i386_thread_state *)state)->efl & 0x100;
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if (!was_aborted && was_valid)
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/* See which registers have changed after aborting the thread. */
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{
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int check_regno;
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for (check_regno = 0; check_regno < I386_NUM_GREGS; check_regno++)
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if ((thread->fetched_regs & (1 << check_regno))
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&& memcpy (REG_ADDR (&old_state, check_regno),
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REG_ADDR (state, check_regno),
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register_size (gdbarch, check_regno)))
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/* Register CHECK_REGNO has changed! Ack! */
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{
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warning (_("Register %s changed after the thread was aborted"),
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gdbarch_register_name (gdbarch, check_regno));
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if (regno >= 0 && regno != check_regno)
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/* Update GDB's copy of the register. */
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regcache_raw_supply (regcache, check_regno,
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REG_ADDR (state, check_regno));
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else
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warning (_("... also writing this register! "
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"Suspicious..."));
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}
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}
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if (regno == -1)
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{
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int i;
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proc_debug (thread, "storing all registers");
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for (i = 0; i < I386_NUM_GREGS; i++)
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if (REG_VALID == regcache_register_status (regcache, i))
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regcache_raw_collect (regcache, i, REG_ADDR (state, i));
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}
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else
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{
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proc_debug (thread, "storing register %s",
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gdbarch_register_name (gdbarch, regno));
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gdb_assert (REG_VALID == regcache_register_status (regcache, regno));
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regcache_raw_collect (regcache, regno, REG_ADDR (state, regno));
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}
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/* Restore the T bit. */
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((struct i386_thread_state *)state)->efl &= ~0x100;
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((struct i386_thread_state *)state)->efl |= trace;
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}
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if (regno >= I386_NUM_GREGS || regno == -1)
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{
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proc_debug (thread, "storing floating-point registers");
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store_fpregs (regcache, thread, regno);
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}
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern initialize_file_ftype _initialize_i386gnu_nat;
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void
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_initialize_i386gnu_nat (void)
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{
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struct target_ops *t;
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/* Fill in the generic GNU/Hurd methods. */
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t = gnu_target ();
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t->to_fetch_registers = gnu_fetch_registers;
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t->to_store_registers = gnu_store_registers;
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/* Register the target. */
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add_target (t);
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}
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