Merge pull request #695 from zchong-cht/master

[bsp] Add libcpu/arm/am335x/context_iar.S file
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Bernard Xiong 2017-02-06 22:04:28 +08:00 committed by GitHub
commit 06920fe74a
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;/*
; * File : context_iar.S
; * This file is part of RT-Thread RTOS
; * COPYRIGHT (C) 2006, RT-Thread Development Team
; *
; * This program is free software; you can redistribute it and/or modify
; * it under the terms of the GNU General Public License as published by
; * the Free Software Foundation; either version 2 of the License, or
; * (at your option) any later version.
; *
; * This program is distributed in the hope that it will be useful,
; * but WITHOUT ANY WARRANTY; without even the implied warranty of
; * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; * GNU General Public License for more details.
; *
; * You should have received a copy of the GNU General Public License along
; * with this program; if not, write to the Free Software Foundation, Inc.,
; * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
; *
; * Change Logs:
; * Date Author Notes
; * 2011-08-14 weety copy from mini2440
; * 2015-04-15 ArdaFu convert from context_gcc.s
; */
#define NOINT 0xc0
SECTION .text:CODE(6)
/*
* rt_base_t rt_hw_interrupt_disable();
*/
PUBLIC rt_hw_interrupt_disable
rt_hw_interrupt_disable:
MRS R0, CPSR
ORR R1, R0, #NOINT
MSR CPSR_C, R1
MOV PC, LR
/*
* void rt_hw_interrupt_enable(rt_base_t level);
*/
PUBLIC rt_hw_interrupt_enable
rt_hw_interrupt_enable:
MSR CPSR_CXSF, R0
MOV PC, LR
/*
* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
* r0 --> from
* r1 --> to
*/
PUBLIC rt_hw_context_switch
rt_hw_context_switch:
STMFD SP!, {LR} ; push pc (lr should be pushed in place of PC)
STMFD SP!, {R0-R12, LR} ; push lr & register file
MRS R4, CPSR
STMFD SP!, {R4} ; push cpsr
STR SP, [R0] ; store sp in preempted tasks TCB
LDR SP, [R1] ; get new task stack pointer
LDMFD SP!, {R4} ; pop new task spsr
MSR SPSR_cxsf, R4
LDMFD SP!, {R0-R12, LR, PC}^ ; pop new task r0-r12, lr & pc
/*
* void rt_hw_context_switch_to(rt_uint32 to);
* r0 --> to
*/
PUBLIC rt_hw_context_switch_to
rt_hw_context_switch_to:
LDR SP, [R0] ; get new task stack pointer
LDMFD SP!, {R4} ; pop new task spsr
MSR SPSR_cxsf, R4
LDMFD SP!, {R0-R12, LR, PC}^ ; pop new task r0-r12, lr & pc
/*
* void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
*/
IMPORT rt_thread_switch_interrupt_flag
IMPORT rt_interrupt_from_thread
IMPORT rt_interrupt_to_thread
PUBLIC rt_hw_context_switch_interrupt
rt_hw_context_switch_interrupt:
LDR R2, =rt_thread_switch_interrupt_flag
LDR R3, [R2]
CMP R3, #1
BEQ _reswitch
MOV R3, #1 ; set flag to 1
STR R3, [R2]
LDR R2, =rt_interrupt_from_thread ; set rt_interrupt_from_thread
STR R0, [R2]
_reswitch:
LDR R2, =rt_interrupt_to_thread ; set rt_interrupt_to_thread
STR R1, [R2]
MOV PC, LR
END