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ChibiOS
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git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1816 35acf78f-673a-0410-8e92-d51de3d6d3f4

This commit is contained in:
gdisirio 2010-03-30 20:06:21 +00:00
parent 3846f18c12
commit 652029259b
2 changed files with 24 additions and 7 deletions
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29
os/ports/GCC/ARMCMx/chcore.c
View File

@ -80,28 +80,46 @@ __attribute__((naked))
#endif
void _port_switch_from_irq(void) {
/* Note, saves r4 to make space for the PC.*/
#if defined(CH_ARCHITECTURE_ARM_v6M)
asm volatile ("push {r0, r1, r2, r3, r4} \n\t" \
"mov r0, r12 \n\t" \
"mrs r1, XPSR \n\t" \
"mrs r0, XPSR \n\t" \
"mov r1, r12 \n\t" \
"push {r0, r1, lr} \n\t" \
"ldr r0, =_port_saved_pc \n\t" \
"ldr r0, [r0] \n\t" \
"add r0, r0, #1 \n\t" \
"str r0, [sp, #28]");
#elif defined(CH_ARCHITECTURE_ARM_v7M)
asm volatile ("push {r0, r1, r2, r3, r4} \n\t" \
"mrs r0, XPSR \n\t" \
"push {r0, r12, lr} \n\t" \
"ldr r0, =_port_saved_pc \n\t" \
"ldr r0, [r0] \n\t" \
"add r0, r0, #1 \n\t" \
"str r0, [sp, #28]");
#endif
chSchDoRescheduleI();
/* Note, the PC is restored alone after re-enabling the interrupts in
order to minimize the (very remote and unlikely) possibility that
the stack is filled by continous and saturating interrups that would
the stack is filled by continuous and saturating interrupts that would
not allow that last word to be pulled out of the stack.*/
#if defined(CH_ARCHITECTURE_ARM_v6M)
asm volatile ("pop {r0, r1, r2} \n\t" \
"mov r12, r0 \n\t" \
"msr XPSR, r1 \n\t" \
"mov r12, r1 \n\t" \
"msr XPSR, r0 \n\t" \
"mov lr, r2 \n\t" \
"pop {r0, r1, r2, r3} \n\t" \
"cpsie i \n\t" \
"pop {pc}");
#elif defined(CH_ARCHITECTURE_ARM_v7M)
asm volatile ("pop {r0, r12, lr} \n\t" \
"msr XPSR, r0 \n\t" \
"pop {r0, r1, r2, r3} \n\t" \
"cpsie i \n\t" \
"pop {pc}");
#endif
}
#if defined(CH_ARCHITECTURE_ARM_v6M)
@ -131,7 +149,6 @@ void _port_switch_from_irq(void) {
asm volatile ("pop {r4, r5, r6, r7, r8, r9, r10, r11, pc} \n\t" \
: : "r" (sp)); \
}
#else
#endif
/**

2
os/ports/GCC/ARMCMx/chcore.h
View File

@ -198,8 +198,8 @@ struct cmxctx {
* preemption-capable interrupt handler.
*/
struct extctx {
regarm_t r12;
regarm_t xpsr;
regarm_t r12;
regarm_t lr;
regarm_t r0;
regarm_t r1;