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/* Machine-dependent details of interruptible RPC messaging. i386 version.
Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Note that we must mark OPTION and TIMEOUT as outputs of this operation,
to indicate that the signal thread might mutate them as part
of sending us to a signal handler. */
#define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify) \
({ \
error_t err; \
asm (".globl _hurd_intr_rpc_msg_do_trap\n" \
".globl _hurd_intr_rpc_msg_in_trap\n" \
".globl _hurd_intr_rpc_msg_cx_sp\n" \
".globl _hurd_intr_rpc_msg_sp_restored\n" \
" movl %%esp, %%ecx\n" \
" leal %3, %%esp\n" \
"_hurd_intr_rpc_msg_cx_sp: movl $-25, %%eax\n" \
"_hurd_intr_rpc_msg_do_trap: lcall $7, $0 # status in %0\n" \
"_hurd_intr_rpc_msg_in_trap: movl %%ecx, %%esp\n" \
"_hurd_intr_rpc_msg_sp_restored:" \
: "=a" (err), "=m" (option), "=m" (timeout) \
: "m" ((&msg)[-1]), "1" (option), "2" (timeout) \
: "%ecx"); \
err; \
})
static void inline
INTR_MSG_BACK_OUT (struct i386_thread_state *state)
{
extern const void _hurd_intr_rpc_msg_cx_sp;
if (state->eip >= (natural_t) &_hurd_intr_rpc_msg_cx_sp)
state->uesp = state->ecx;
else
state->ecx = state->uesp;
}
#include "hurdfault.h"
static inline int
SYSCALL_EXAMINE (struct i386_thread_state *state, int *callno)
{
struct { unsigned int c[2]; } *p = (void *) (state->eip - 7);
int result;
if (_hurdsig_catch_memory_fault (p))
return 0;
if (result = p->c[0] == 0x0000009a && (p->c[1] & 0x00ffffff) == 0x00000700)
/* The PC is just after an `lcall $7,$0' instruction.
This is a system call in progress; %eax holds the call number. */
*callno = state->eax;
_hurdsig_end_catch_fault ();
return result;
}
struct mach_msg_trap_args
{
void *retaddr; /* Address mach_msg_trap will return to. */
/* This is the order of arguments to mach_msg_trap. */
mach_msg_header_t *msg;
mach_msg_option_t option;
mach_msg_size_t send_size;
mach_msg_size_t rcv_size;
mach_port_t rcv_name;
mach_msg_timeout_t timeout;
mach_port_t notify;
};
static inline mach_port_t
MSG_EXAMINE (struct i386_thread_state *state, int *msgid)
{
const struct mach_msg_trap_args *args = (const void *) state->uesp;
mach_msg_header_t *msg;
mach_port_t send_port;
if (_hurdsig_catch_memory_fault (args))
return MACH_PORT_NULL;
msg = args->msg;
_hurdsig_end_catch_fault ();
if (_hurdsig_catch_memory_fault (msg))
return MACH_PORT_NULL;
send_port = msg->msgh_remote_port;
*msgid = msg->msgh_id;
_hurdsig_end_catch_fault ();
return send_port;
}
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