glibc/sysdeps/unix/sysv/linux/mips/mips64/syscall.S

/* Copyright (C) 2001, 2002, 2003, 2005 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.  */

#include <sysdep.h>

#include <sys/asm.h>

/* Usage:
   long syscall (syscall_number, arg1, arg2, arg3, arg4, arg5, arg6, arg7)

   We need to do some arg shifting, syscall_number will be in v0.  */


	.text
NESTED (syscall, SZREG, ra)
	.mask 0x00010000, -SZREG
	.fmask 0x00000000, 0
	PTR_ADDIU sp, -SZREG
	REG_S s0, (sp)

	move s0, a0
	move a0, a1		/* shift arg1 - arg7.  */
	move a1, a2
	move a2, a3
	move a3, a4
	move a4, a5
	move a5, a6
	move a6, a7

	move v0, s0		/* Syscall number -> v0 */
	syscall			/* Do the system call.  */

	REG_L s0, (sp)
	PTR_ADDIU sp, SZREG
	bne a3, zero, L(error)

	ret

L(error):
	SETUP_GP64 (a0, syscall)
	PTR_LA t9, __syscall_error
	RESTORE_GP64
	jr t9

END (syscall)