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