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add context_iar.S for SCONS

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actually context_iar.S is the same as context_iar.asm
but context_iar.S is used for SCONS, and context_iar.asm is used for IAR

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1272 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
dzzxzz 2011-02-16 13:47:44 +00:00
parent e01eaabee9
commit fac560d432
1 changed files with 90 additions and 0 deletions
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90
libcpu/m16c/m16c62p/context_iar.S Normal file
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/*
* File : context.asm
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2009, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2010-04-09 fify the first version
* 2010-04-19 fify rewrite rt_hw_interrupt_disable/enable fuction
* 2010-04-20 fify move peripheral ISR to bsp/interrupts.s34
*
* For : Renesas M16C
* Toolchain : IAR's EW for M16C v3.401
*/
RSEG CSTACK
RSEG ISTACK
RSEG CODE(1)
EXTERN rt_thread_switch_interrput_flag
EXTERN rt_interrupt_from_thread
EXTERN rt_interrupt_to_thread
PUBLIC rt_hw_interrupt_disable
PUBLIC rt_hw_interrupt_enable
PUBLIC rt_hw_context_switch_to
PUBLIC rt_hw_context_switch
PUBLIC rt_hw_context_switch_interrupt
PUBLIC os_context_switch
rt_hw_interrupt_disable
STC FLG, R0 ;fify 20100419
FCLR I
RTS
rt_hw_interrupt_enable
LDC R0, FLG ;fify 20100419
RTS
.EVEN
os_context_switch:
PUSHM R0,R1,R2,R3,A0,A1,SB,FB
CMP.W #0,rt_thread_switch_interrput_flag
JEQ exit
MOV.W #0, rt_thread_switch_interrput_flag
MOV.W rt_interrupt_from_thread, A0
STC ISP, [A0]
MOV.W rt_interrupt_to_thread, A0
LDC [A0], ISP
exit
POPM R0,R1,R2,R3,A0,A1,SB,FB ; Restore registers from the new task's stack
REIT ; Return from interrup
/*
* void rt_hw_context_switch_to(rt_uint32 to);
* r0 --> to
* this fucntion is used to perform the first thread switch
*/
rt_hw_context_switch_to
MOV.W R0, A0
LDC [A0], ISP
POPM R0,R1,R2,R3,A0,A1,SB,FB
REIT
rt_hw_context_switch
CMP.W #1,rt_thread_switch_interrput_flag
JEQ jump1
MOV.W #1,rt_thread_switch_interrput_flag
MOV.W R0, rt_interrupt_from_thread
jump1
MOV.W R1, rt_interrupt_to_thread
INT #0
RTS
rt_hw_context_switch_interrupt
CMP.W #1,rt_thread_switch_interrput_flag
JEQ jump
MOV.W #1,rt_thread_switch_interrput_flag
MOV.W R0, rt_interrupt_from_thread
jump
MOV.W R1, rt_interrupt_to_thread
RTS
END