mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 16:54:20 +08:00
92 lines
2.2 KiB
PHP
92 lines
2.2 KiB
PHP
/* MN10300 Microcontroller core system register definitions -*- asm -*-
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_FRAME_INC
|
|
#define _ASM_FRAME_INC
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#error not for use in C files
|
|
#endif
|
|
|
|
#ifndef __ASM_OFFSETS_H__
|
|
#include <asm/asm-offsets.h>
|
|
#endif
|
|
|
|
#define pi break
|
|
|
|
#define fp a3
|
|
|
|
###############################################################################
|
|
#
|
|
# build a stack frame from the registers
|
|
# - the caller has subtracted 4 from SP before coming here
|
|
#
|
|
###############################################################################
|
|
.macro SAVE_ALL
|
|
add -4,sp # next exception frame ptr save area
|
|
movm [other],(sp)
|
|
mov usp,a1
|
|
mov a1,(sp) # USP in MOVM[other] dummy slot
|
|
movm [d2,d3,a2,a3,exreg0,exreg1,exother],(sp)
|
|
mov sp,fp # FRAME pointer in A3
|
|
add -12,sp # allow for calls to be made
|
|
mov (__frame),a1
|
|
mov a1,(REG_NEXT,fp)
|
|
mov fp,(__frame)
|
|
|
|
and ~EPSW_FE,epsw # disable the FPU inside the kernel
|
|
|
|
# we may be holding current in E2
|
|
#ifdef CONFIG_MN10300_CURRENT_IN_E2
|
|
mov (__current),e2
|
|
#endif
|
|
.endm
|
|
|
|
###############################################################################
|
|
#
|
|
# restore the registers from a stack frame
|
|
#
|
|
###############################################################################
|
|
.macro RESTORE_ALL
|
|
# peel back the stack to the calling frame
|
|
# - this permits execve() to discard extra frames due to kernel syscalls
|
|
mov (__frame),fp
|
|
mov fp,sp
|
|
mov (REG_NEXT,fp),d0 # userspace has regs->next == 0
|
|
mov d0,(__frame)
|
|
|
|
#ifndef CONFIG_MN10300_USING_JTAG
|
|
mov (REG_EPSW,fp),d0
|
|
btst EPSW_T,d0
|
|
beq 99f
|
|
|
|
or EPSW_NMID,epsw
|
|
movhu (DCR),d1
|
|
or 0x0001, d1
|
|
movhu d1,(DCR)
|
|
|
|
99:
|
|
#endif
|
|
movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
|
|
|
|
# must restore usp even if returning to kernel space,
|
|
# when CONFIG_PREEMPT is enabled.
|
|
mov (sp),a1 # USP in MOVM[other] dummy slot
|
|
mov a1,usp
|
|
|
|
movm (sp),[other]
|
|
add 8,sp
|
|
rti
|
|
|
|
.endm
|
|
|
|
|
|
#endif /* _ASM_FRAME_INC */
|