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/* System call interface code for Sequent Symmetry running Dynix version 3.
Copyright (C) 1993, 1995, 1997 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. */
#include <sysdeps/unix/i386/sysdep.h>
#ifdef __ASSEMBLER__
/* Get the symbols for system call interrupts. */
#include <machine/trap.h>
/* Use the BSD versions of system calls, by setting the high 16 bits
of the syscall number (see /usr/include/syscall.h). */
#define SYS_HANDLER (SYS_bsd << 16)
/* Dynix uses an interrupt interface to system calls.
"int $T_SVCn" are syscall interfaces for 0-6 arg functions.
(see /usr/include/machine/trap.h). */
#undef DO_CALL
#ifdef __STDC__
#define DO_CALL(syscall_name, args) \
movl $(SYS_HANDLER | SYS_##syscall_name), %eax; \
int $T_SVC##args;
#else
#define DO_CALL(syscall_name, args) \
movl $(SYS_HANDLER | SYS_/**/syscall_name), %eax; \
int $T_SVC/**/args;
#endif
#undef PSEUDO
#define PSEUDO(name, syscall_name, args) \
.text; \
.globl syscall_error; \
.align 4; \
ENTRY (name) \
ARGS (args) \
DO_CALL (syscall_name, args) \
jb syscall_error
/* For one and two-argument calls, Dynix takes the arguments in %ecx and
%edx. For 3-6 argument calls, Dynix takes the address of the first
argument in %ecx. */
#ifdef __STDC__
#define ARGS(n) ARGS_##n
#else
#define ARGS(n) ARGS_/**/n
#endif
#define ARGS_0
#define ARGS_1 movl 4(%esp), %ecx;
#define ARGS_2 movl 4(%esp), %ecx; movl 8(%esp), %edx;
#define ARGS_3 leal 4(%esp), %ecx;
#define ARGS_4 ARGS_3
#define ARGS_5 ARGS_3
#define ARGS_6 ARGS_3
/* Dynix reverses %ecx and %edx relative to most i386 Unices. */
#undef r1
#define r1 %ecx /* Secondary return-value register. */
#undef scratch
#define scratch %edx /* Call-clobbered register for random use. */
#endif /* __ASSEMBLER__ */
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