2 * libc/sysdeps/linux/v850/syscall.c -- generic syscall function for linux/v850
4 * Copyright (C) 2002 NEC Corporation
5 * Copyright (C) 2002 Miles Bader <miles@gnu.org>
7 * This file is subject to the terms and conditions of the GNU Lesser
8 * General Public License. See the file COPYING.LIB in the main
9 * directory of this archive for more details.
11 * Written by Miles Bader <miles@gnu.org>
15 #include <sys/syscall.h>
17 typedef unsigned long arg_t;
19 /* Invoke `system call' NUM, passing it the remaining arguments.
20 This is completely system-dependent, and not often useful. */
22 syscall (long num, arg_t a1, arg_t a2, arg_t a3, arg_t a4, arg_t a5, arg_t a6)
24 /* We don't know how many arguments are valid, so A5 and A6 are fetched
25 off the stack even for (the majority of) system calls with fewer
26 arguments; hopefully this won't cause any problems. A1-A4 are in
27 registers, so they're OK. */
28 register arg_t a __asm__ (SYSCALL_ARG0) = a1;
29 register arg_t b __asm__ (SYSCALL_ARG1) = a2;
30 register arg_t c __asm__ (SYSCALL_ARG2) = a3;
31 register arg_t d __asm__ (SYSCALL_ARG3) = a4;
32 register arg_t e __asm__ (SYSCALL_ARG4) = a5;
33 register arg_t f __asm__ (SYSCALL_ARG5) = a6;
34 register unsigned long syscall __asm__ (SYSCALL_NUM) = num;
35 register unsigned long ret __asm__ (SYSCALL_RET);
37 __asm__ ("trap " SYSCALL_LONG_TRAP
39 : "r" (syscall), "r" (a), "r" (b), "r" (c), "r" (d), "r" (e), "r" (f)
42 __syscall_return (long, ret);