diff options
Diffstat (limited to 'libc/sysdeps/linux/v850/syscall.c')
| -rw-r--r-- | libc/sysdeps/linux/v850/syscall.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/v850/syscall.c b/libc/sysdeps/linux/v850/syscall.c new file mode 100644 index 000000000..2b7d67b4a --- /dev/null +++ b/libc/sysdeps/linux/v850/syscall.c @@ -0,0 +1,43 @@ +/* + * libc/sysdeps/linux/v850/syscall.c -- generic syscall function for linux/v850 + * + * 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); + + asm ("trap " SYSCALL_LONG_TRAP + : "=r" (ret) + : "r" (syscall), "r" (a), "r" (b), "r" (c), "r" (d), "r" (e), "r" (f) + : SYSCALL_CLOBBERS); + + __syscall_return (long, ret); +} |