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Kernel/aarch64: Handle exceptions from lower exception level (EL)

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When we execute in userspace, the exception level is EL0, so to handle
exceptions, such as interrupts, and syscalls, we need to add handlers to
vector_table.S. For now we only support running userspace applications
in AArch64 mode, so this commit only adds the handlers for that mode.
This commit is contained in:
Timon Kruiper 2023-01-30 10:32:37 +01:00 committed by Linus Groh
parent 7be7324287
commit c7802cef25
1 changed files with 28 additions and 4 deletions
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32
Kernel/Arch/aarch64/vector_table.S
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@ -128,10 +128,10 @@ vector_table_el1:
table_entry system_error_current_elsp_elx
// Exceptions from Lower EL, where causing application is in AArch64 mode
unimplemented_entry
unimplemented_entry
unimplemented_entry
unimplemented_entry
table_entry synchronous_lower_el
table_entry irq_lower_el
table_entry fiq_lower_el
table_entry system_error_lower_el
// Exceptions from Lower EL, where causing application is in AArch32 mode
unimplemented_entry
@ -187,6 +187,30 @@ system_error_current_elsp_el0:
restore_previous_context
eret
synchronous_lower_el:
save_current_context
bl exception_common
restore_previous_context
eret
irq_lower_el:
save_current_context
bl handle_interrupt
restore_previous_context
eret
fiq_lower_el:
save_current_context
bl exception_common
restore_previous_context
eret
system_error_lower_el:
save_current_context
bl exception_common
restore_previous_context
eret
.global restore_context_and_eret
restore_context_and_eret:
restore_previous_context