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add thumb mode support. 

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1629 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
bernard.xiong 2011-07-15 05:44:38 +00:00
parent 86d6c01c9e
commit 1b9e80dc70
3 changed files with 31 additions and 26 deletions
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33
libcpu/arm/lpc24xx/context_rvds.S
View File

@ -49,20 +49,23 @@ rt_hw_context_switch PROC
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
MRS r4, cpsr
TST lr, #0x01
BEQ _ARM_MODE
ORR r4, r4, #0x20 ; it's thumb code
_ARM_MODE
STMFD sp!, {r4} ; push cpsr
MRS r4, spsr
STMFD sp!, {r4} ; push spsr
STR sp, [r0] ; store sp in preempted tasks TCB
LDR sp, [r1] ; get new task stack pointer
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!, {r4} ; pop new task cpsr
MSR cpsr_cxsf, r4
LDMFD sp!, {r4} ; pop new task cpsr to spsr
MSR spsr_cxsf, r4
BIC r4, r4, #0x20 ; must be ARM mode
MSR cpsr_cxsf, r4
LDMFD sp!, {r0-r12, lr, pc} ; pop new task r0-r12, lr & pc
LDMFD sp!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc, copy spsr to cpsr
ENDP
;/*
@ -73,12 +76,12 @@ rt_hw_context_switch_to PROC
EXPORT 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!, {r4} ; pop new task cpsr
MSR cpsr_cxsf, r4
LDMFD sp!, {r4} ; pop new task cpsr to spsr
MSR spsr_cxsf, r4
BIC r4, r4, #0x20 ; must be ARM mode
MSR cpsr_cxsf, r4
LDMFD sp!, {r0-r12, lr, pc} ; pop new task r0-r12, lr & pc
LDMFD sp!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc, copy spsr to cpsr
ENDP
;/*

12
libcpu/arm/lpc24xx/stack.c
View File

@ -12,7 +12,7 @@
* 2008-12-11 XuXinming first version
*/
#include <rtthread.h>
#include "LPC24xx.h"
#include "LPC24xx.h"
/**
* @addtogroup LPC2478
@ -49,9 +49,13 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
*(--stk) = 0; /* r3 */
*(--stk) = 0; /* r2 */
*(--stk) = 0; /* r1 */
*(--stk) = (unsigned long)parameter; /* r0 : argument */
*(--stk) = SVCMODE; /* cpsr */
*(--stk) = SVCMODE; /* spsr */
*(--stk) = (unsigned long)parameter; /* r0 : argument */
/* cpsr */
if ((rt_uint32_t)tentry & 0x01)
*(--stk) = SVCMODE | 0x20; /* thumb mode */
else
*(--stk) = SVCMODE; /* arm mode */
/* return task's current stack address */
return (rt_uint8_t *)stk;

12
libcpu/arm/lpc24xx/start_rvds.S
View File

@ -1538,8 +1538,6 @@ rt_hw_context_switch_interrupt_do PROC
LDMFD r4!, {r0-r3}
STMFD sp!, {r0-r3} ; push old task's r3-r0
STMFD sp!, {r5} ; push old task's cpsr
MRS r4, spsr
STMFD sp!, {r4} ; push old task's spsr
LDR r4, =rt_interrupt_from_thread
LDR r5, [r4]
@ -1548,13 +1546,13 @@ rt_hw_context_switch_interrupt_do PROC
LDR r6, =rt_interrupt_to_thread
LDR r6, [r6]
LDR sp, [r6] ; get new task's stack pointer
LDMFD sp!, {r4} ; pop new task's spsr
MSR spsr_cxsf, r4
LDMFD sp!, {r4} ; pop new task's psr
LDMFD sp!, {r4} ; pop new task's cpsr to spsr
MSR spsr_cxsf, r4
BIC r4, r4, #0x20 ; must be ARM mode
MSR cpsr_cxsf, r4
LDMFD sp!, {r0-r12,lr,pc} ; pop new task's r0-r12,lr & pc
LDMFD sp!, {r0-r12,lr,pc}^ ; pop new task's r0-r12,lr & pc, copy spsr to cpsr
ENDP
IF :DEF:__MICROLIB