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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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