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| author | Wojtek Kosior <kwojtus@protonmail.com> | 2019-12-31 18:54:28 +0100 |
|---|---|---|
| committer | Wojtek Kosior <kwojtus@protonmail.com> | 2019-12-31 18:54:28 +0100 |
| commit | 0ec2016f80ffb5971362559b98b10744bb5bf893 (patch) | |
| tree | 839991c83c04ef157cdc4b3d747a79ca5975445b /interrupt_vector.S | |
| parent | 97612feede34cdd0099d72d0e6fa125dd65b5e9a (diff) | |
| download | rpi-MMU-example-0ec2016f80ffb5971362559b98b10744bb5bf893.tar.gz rpi-MMU-example-0ec2016f80ffb5971362559b98b10744bb5bf893.zip | |
split stack into irq, fiq and supervisor stacks; add proper handling of those in interrupt handlers (asm code)
Diffstat (limited to 'interrupt_vector.S')
| -rw-r--r-- | interrupt_vector.S | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/interrupt_vector.S b/interrupt_vector.S index 88b32bf..af80eec 100644 --- a/interrupt_vector.S +++ b/interrupt_vector.S @@ -9,39 +9,42 @@ _interrupt_vectors: b fiq_handler_caller reset_handler_caller: - ldr sp, =_stack_top + ldr sp, =_supervisor_stack_top ldr r5, =reset_handler bx r5 undef_handler_caller: - ldr sp, =_stack_top + ldr sp, =_supervisor_stack_top ldr r5, =undefined_instruction_vector bx r5 svc_handler_caller: - ldr sp, =_stack_top + ldr sp, =_supervisor_stack_top + push {r5, lr} ldr r5, =supervisor_call_handler - push {lr} blx r5 - ldm sp!, {pc} ^ + ldm sp!, {r5, pc} ^ abort_handler_caller: - ldr sp, =_stack_top + ldr sp, =_supervisor_stack_top ldr r5, =abort_handler bx r5 generic_handler_caller: - ldr sp, =_stack_top + ldr sp, =_supervisor_stack_top ldr r5, =generic_handler bx r5 irq_handler_caller: - ldr sp, =_stack_top - ldr r5, =irq_handler - bx r5 + ldr sp, =_irq_stack_top + sub lr, #4 + push {r0-r3, lr} + ldr r3, =irq_handler + blx r3 + ldm sp!, {r0-r3, pc} ^ fiq_handler_caller: - ldr sp, =_stack_top + ldr sp, =_fiq_stack_top ldr r5, =fiq_handler bx r5 |