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Kernel: Set up initial exception stack when going into EL1 on aarch64

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When an exception is triggered on aarch64, the processor always switches
to the exception stack which is defined by the SP_EL1 register.
This commit is contained in:
Timon Kruiper 2022-05-10 22:07:42 +02:00 • committed by Linus Groh
parent 9f730fab8d
commit 06432719fd
2 changed files with 9 additions and 0 deletions
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5
Kernel/Arch/aarch64/ASM_wrapper.h
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@ -23,6 +23,11 @@ inline void set_ttbr0_el1(FlatPtr ttbr0_el1)
asm("msr ttbr0_el1, %[value]" ::[value] "r"(ttbr0_el1));
}
inline void set_sp_el1(FlatPtr sp_el1)
{
asm("msr sp_el1, %[value]" ::[value] "r"(sp_el1));
}
inline void flush()
{
asm("dsb ish");

4
Kernel/Arch/aarch64/Exceptions.cpp
View file

@ -46,6 +46,10 @@ static void drop_to_el1()
hypervisor_configuration_register_el2.RW = 1; // EL1 to use 64-bit mode
Aarch64::HCR_EL2::write(hypervisor_configuration_register_el2);
// Set up initial exception stack
// FIXME: Define in linker script
Aarch64::Asm::set_sp_el1(0x40000);
Aarch64::SPSR_EL2 saved_program_status_register_el2 = {};
// Mask (disable) all interrupts