glibc/sysdeps/mach/hurd/i386/intr-msg.h
Andreas Jaeger 41bdb6e20c Update to LGPL v2.1.
2001-07-06  Paul Eggert  <eggert@twinsun.com>

	* manual/argp.texi: Remove ignored LGPL copyright notice; it's
	not appropriate for documentation anyway.
	* manual/libc-texinfo.sh: "Library General Public License" ->
	"Lesser General Public License".

2001-07-06  Andreas Jaeger  <aj@suse.de>

	* All files under GPL/LGPL version 2: Place under LGPL version
	2.1.
2001-07-06 04:58:11 +00:00

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/* Machine-dependent details of interruptible RPC messaging. i386 version.
Copyright (C) 1995,96,97,99,2001 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; 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"
/* This cannot be an inline function because it calls setjmp. */
#define SYSCALL_EXAMINE(state, 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 (); \
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;
};
/* This cannot be an inline function because it calls setjmp. */
#define MSG_EXAMINE(state, msgid, rcvname, send_name, opt, tmout) \
({ \
const struct mach_msg_trap_args *args = (const void *) (state)->uesp; \
mach_msg_header_t *msg; \
_hurdsig_catch_memory_fault (args) ? -1 : \
({ \
msg = args->msg; \
*(opt) = args->option; \
*(tmout) = args->timeout; \
*(rcvname) = args->rcv_name; \
_hurdsig_end_catch_fault (); \
if (msg == 0) \
{ \
*(send_name) = MACH_PORT_NULL; \
*(msgid) = 0; \
} \
else \
{ \
if (_hurdsig_catch_memory_fault (msg)) \
return -1; \
*(send_name) = msg->msgh_remote_port; \
*(msgid) = msg->msgh_id; \
_hurdsig_end_catch_fault (); \
} \
0; \
}); \
})