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arm64: Save/restore TPIDR_EL0 in _arch_context_swap

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It's not used for anything by the OS but userspace might want
to use it for its own purposes.

Change-Id: Icda4bcd6de9d68596555e81293c8bd075f80a2a4
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7511
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>
This commit is contained in:
milek7
2024-03-07 15:53:37 +00:00
committed by waddlesplash
parent ea989da7f1
commit 51edf9322c
2 changed files with 5 additions and 3 deletions
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headers/private/kernel/arch/arm64/arch_thread_types.h
+1 -1
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@@ -18,7 +18,7 @@ struct iframe_stack {
struct arch_thread { struct arch_thread {
uint64 regs[13]; // x19-x30, sp uint64 regs[14]; // x19-x30, sp, tpidr_el0
uint64 fp_regs[8]; // d8-d15 uint64 fp_regs[8]; // d8-d15
// used to track interrupts on this thread // used to track interrupts on this thread
src/system/kernel/arch/arm64/arch_asm.S
+4 -2
View File
@@ -253,7 +253,8 @@ FUNCTION(_arch_context_swap):
stp x29, x30, [x0], #16 stp x29, x30, [x0], #16
mov x2, sp mov x2, sp
str x2, [x0], #8 mrs x3, TPIDR_EL0
stp x2, x3, [x0], #16
stp d8, d9, [x0], #16 stp d8, d9, [x0], #16
stp d10, d11, [x0], #16 stp d10, d11, [x0], #16
@@ -268,8 +269,9 @@ FUNCTION(_arch_context_swap):
ldp x27, x28, [x1], #16 ldp x27, x28, [x1], #16
ldp x29, x30, [x1], #16 ldp x29, x30, [x1], #16
ldr x2, [x1], #8 ldp x2, x3, [x1], #16
mov sp, x2 mov sp, x2
msr TPIDR_EL0, x3
ldp d8, d9, [x1], #16 ldp d8, d9, [x1], #16
ldp d10, d11, [x1], #16 ldp d10, d11, [x1], #16