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28 lines
802 B
ArmAsm
28 lines
802 B
ArmAsm
.section .text
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.arm
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#include <arm.h>
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.global main_irq_handler
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.type main_irq_handler, %function
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main_irq_handler:
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sub lr, lr, #4 @ Fix return address
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srsdb sp!, #(SR_SVC_MODE) @ Store IRQ mode LR and SPSR on the SVC stack
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cpsid i, #(SR_SVC_MODE) @ Switch to SVC mode
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push {r0-r3,r12} @ Preserve registers
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and r1, sp, #4
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sub sp, sp, r1 @ Word-align stack
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push {r1,lr}
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bl GIC_AckIRQ @ Acknowledge interrupt, get handler address
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cmp r0, #0
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beq .Lskip_irq
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blx r0 @ Branch to interrupt handler
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.Lskip_irq:
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pop {r1,lr}
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add sp, sp, r1 @ Restore stack pointer
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pop {r0-r3,lr} @ Restore registers
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rfeia sp! @ Return From Exception
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