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/*
* libc/sysdeps/linux/microblaze/syscall.c -- generic syscall function for linux/microblaze
*
* Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
* Copyright (C) 2002 NEC Corporation
* Copyright (C) 2002 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*
* Written by Miles Bader <miles@gnu.org>
*/
#include <errno.h>
#include <sys/syscall.h>
typedef unsigned long arg_t;
/* Invoke `system call' NUM, passing it the remaining arguments.
This is completely system-dependent, and not often useful. */
long
syscall (long num, arg_t a1, arg_t a2, arg_t a3, arg_t a4, arg_t a5, arg_t a6)
{
/* We don't know how many arguments are valid, so A5 and A6 are fetched
off the stack even for (the majority of) system calls with fewer
arguments; hopefully this won't cause any problems. A1-A4 are in
registers, so they're OK. */
register arg_t a asm (SYSCALL_ARG0) = a1;
register arg_t b asm (SYSCALL_ARG1) = a2;
register arg_t c asm (SYSCALL_ARG2) = a3;
register arg_t d asm (SYSCALL_ARG3) = a4;
register arg_t e asm (SYSCALL_ARG4) = a5;
register arg_t f asm (SYSCALL_ARG5) = a6;
register unsigned long syscall asm (SYSCALL_NUM) = num;
register unsigned long ret asm (SYSCALL_RET);
unsigned long ret_sav;
*((unsigned long *)0xFFFF4004) = (unsigned int)('+');
asm ("brlid r17, 08x; nop;"
: "=r" (ret)
: "r" (syscall), "r" (a), "r" (b), "r" (c), "r" (d), "r" (e), "r" (f)
: SYSCALL_CLOBBERS);
ret_sav=ret;
*((unsigned long *)0xFFFF4004) = (unsigned int)('-');
__syscall_return (long, ret);
}
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