binutils-gdb/gdb/i386gnu-nat.c

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