72 lines
1.6 KiB
ArmAsm
72 lines
1.6 KiB
ArmAsm
###############################################################################
|
|
#
|
|
# MN10300 Context switch operation
|
|
#
|
|
# 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.
|
|
#
|
|
###############################################################################
|
|
#include <linux/sys.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/cpu-regs.h>
|
|
|
|
.text
|
|
|
|
###############################################################################
|
|
#
|
|
# struct task_struct *__switch_to(struct thread_struct *prev,
|
|
# struct thread_struct *next,
|
|
# struct task_struct *prev_task)
|
|
#
|
|
###############################################################################
|
|
ENTRY(__switch_to)
|
|
movm [d2,d3,a2,a3,exreg1],(sp)
|
|
or EPSW_NMID,epsw
|
|
|
|
mov (44,sp),d2
|
|
|
|
mov d0,a0
|
|
mov d1,a1
|
|
|
|
# save prev context
|
|
mov (__frame),d0
|
|
mov d0,(THREAD_FRAME,a0)
|
|
mov __switch_back,d0
|
|
mov d0,(THREAD_PC,a0)
|
|
mov sp,a2
|
|
mov a2,(THREAD_SP,a0)
|
|
mov a3,(THREAD_A3,a0)
|
|
|
|
mov (THREAD_A3,a1),a3
|
|
mov (THREAD_SP,a1),a2
|
|
|
|
# switch
|
|
mov a2,sp
|
|
|
|
# load next context
|
|
GET_THREAD_INFO a2
|
|
mov a2,(__current_ti)
|
|
mov (TI_task,a2),a2
|
|
mov a2,(__current)
|
|
#ifdef CONFIG_MN10300_CURRENT_IN_E2
|
|
mov a2,e2
|
|
#endif
|
|
|
|
mov (THREAD_FRAME,a1),a2
|
|
mov a2,(__frame)
|
|
mov (THREAD_PC,a1),a2
|
|
mov d2,d0 # for ret_from_fork
|
|
mov d0,a0 # for __switch_to
|
|
|
|
jmp (a2)
|
|
|
|
__switch_back:
|
|
and ~EPSW_NMID,epsw
|
|
ret [d2,d3,a2,a3,exreg1],32
|