Before this commit, the stack addresses for IRQ and FIQ modes,
IRQ_STACK_START and FIQ_STACK_START, were computed in interrupt_init but
they were not used.
This commit sets the stack pointers for IRQ and FIQ modes.
Signed-off-by: Georges Savoundararadj <savou...@gmail.com>
Cc: Albert Aribaud <albert.u.b...@aribaud.net>
---
Changes in v4:
- Restore initial CPSR value after configuring SP in IRQ and FIQ modes
Changes in v3: None
Changes in v2:
- Reword the commit message
arch/arm/lib/interrupts.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/arm/lib/interrupts.c b/arch/arm/lib/interrupts.c
index 9019736..4dacfd9 100644
--- a/arch/arm/lib/interrupts.c
+++ b/arch/arm/lib/interrupts.c
@@ -28,6 +28,8 @@ DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_USE_IRQ
int interrupt_init (void)
{
+ unsigned long cpsr;
+
/*
* setup up stacks if necessary
*/
@@ -35,6 +37,31 @@ int interrupt_init (void)
IRQ_STACK_START_IN = gd->irq_sp + 8;
FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
+
+ __asm__ __volatile__("mrs %0, cpsr\n"
+ : "=r" (cpsr)
+ :
+ : "memory");
+
+ __asm__ __volatile__("msr cpsr_c, %0\n"
+ "mov sp, %1\n"
+ :
+ : "r" (IRQ_MODE | I_BIT | F_BIT | (cpsr &
~FIQ_MODE)),
+ "r" (IRQ_STACK_START)
+ : "memory");
+
+ __asm__ __volatile__("msr cpsr_c, %0\n"
+ "mov sp, %1\n"
+ :
+ : "r" (FIQ_MODE | I_BIT | F_BIT | (cpsr &
~IRQ_MODE)),
+ "r" (FIQ_STACK_START)
+ : "memory");
+
+ __asm__ __volatile__("msr cpsr_c, %0"
+ :
+ : "r" (cpsr)
+ : "memory");
+
return arch_interrupt_init();
}
--
2.1.2
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