/* $Id: entry.S,v 1.37 2004/06/11 13:02:46 doyu Exp $
*
* linux/arch/sh/entry.S
*
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
* Copyright (C) 2003 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
*/
#include <linux/sys.h>
#include <linux/linkage.h>
#include <linux/config.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/cpu/mmu_context.h>
#include <asm/unistd.h>
#if !defined(CONFIG_NFSD) && !defined(CONFIG_NFSD_MODULE)
#define sys_nfsservctl sys_ni_syscall
#endif
#if !defined(CONFIG_MMU)
#define sys_madvise sys_ni_syscall
#define sys_readahead sys_ni_syscall
#define sys_mprotect sys_ni_syscall
#define sys_msync sys_ni_syscall
#define sys_mlock sys_ni_syscall
#define sys_munlock sys_ni_syscall
#define sys_mlockall sys_ni_syscall
#define sys_munlockall sys_ni_syscall
#define sys_mremap sys_ni_syscall
#define sys_mincore sys_ni_syscall
#define sys_remap_file_pages sys_ni_syscall
#endif
! NOTE:
! GNU as (as of 2.9.1) changes bf/s into bt/s and bra, when the address
! to be jumped is too far, but it causes illegal slot exception.
/*
* entry.S contains the system-call and fault low-level handling routines.
* This also contains the timer-interrupt handler, as well as all interrupts
* and faults that can result in a task-switch.
*
* NOTE: This code handles signal-recognition, which happens every time
* after a timer-interrupt and after each system call.
*
* NOTE: This code uses a convention that instructions in the delay slot
* of a transfer-control instruction are indented by an extra space, thus:
*
* jmp @k0 ! control-transfer instruction
* ldc k1, ssr ! delay slot
*
* Stack layout in 'ret_from_syscall':
* ptrace needs to have all regs on the stack.
* if the order here is changed, it needs to be
* updated in ptrace.c and ptrace.h
*
* r0
* ...
* r15 = stack pointer
* spc
* pr
* ssr
* gbr
* mach
* macl
* syscall #
*
*/
ENOSYS = 38
EINVAL = 22
#if defined(CONFIG_KGDB_NMI)
NMI_VEC = 0x1c0 ! Must catch early for debounce
#endif
/* Offsets to the stack */
OFF_R0 = 0 /* Return value. New ABI also arg4 */
OFF_R1 = 4 /* New ABI: arg5 */
OFF_R2 = 8 /* New ABI: arg6 */
OFF_R3 = 12 /* New ABI: syscall_nr */
OFF_R4
