mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-27 03:51:15 +08:00
28e7fd6234
Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
316 lines
8.7 KiB
C
316 lines
8.7 KiB
C
/* Low level interface to i386 running the GNU Hurd.
|
||
|
||
Copyright (C) 1992-2013 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 "gdb_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)
|
||
};
|
||
|
||
#define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
|
||
#define CREG_ADDR(state, regnum) ((const char *)(state) + reg_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_tid (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_tid (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);
|
||
}
|