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Fix fpu registers not being restored when thread switched out during user exception handler (#2909)

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saad-script authored and GitHub committed 2026-11-07 21:32:25 +00:00
1 parent 6b0c077b4c
commit 6bfe5b8b26
1 file changed
+4 -4
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mesosphere/kernel/source/arch/arm64/kern_k_scheduler_asm.s
+4 -4
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@@ -90,10 +90,10 @@ _ZN3ams4kern10KScheduler12ScheduleImplEv:
/* We have a 64-bit fpu. */
/* If we're in a usermode exception, we need to save the caller-save fpu registers. */
tbz w4, #(THREAD_EXCEPTION_FLAG_BIT_INDEX_IS_IN_USERMODE_EXCEPTION_HANDLER), 2f
tbnz w4, #(THREAD_EXCEPTION_FLAG_BIT_INDEX_IS_IN_USERMODE_EXCEPTION_HANDLER), 2f
/* If we're in an SVC (and not a usermode exception), we only need to save the callee-save fpu registers. */
tbz w4, #(THREAD_EXCEPTION_FLAG_BIT_INDEX_IS_CALLING_SVC), 3f
tbnz w4, #(THREAD_EXCEPTION_FLAG_BIT_INDEX_IS_CALLING_SVC), 3f
2: /* Save the 64-bit caller-save fpu registers. */
ldr x6, [x2, #(THREAD_STACK_PARAMETERS_CALLER_SAVE_FPU_REGISTERS)]
@@ -120,10 +120,10 @@ _ZN3ams4kern10KScheduler12ScheduleImplEv:
4: /* We have a 32-bit fpu. */
/* If we're in a usermode exception, we need to save the caller-save fpu registers. */
tbz w4, #(THREAD_EXCEPTION_FLAG_BIT_INDEX_IS_IN_USERMODE_EXCEPTION_HANDLER), 5f
tbnz w4, #(THREAD_EXCEPTION_FLAG_BIT_INDEX_IS_IN_USERMODE_EXCEPTION_HANDLER), 5f
/* If we're in an SVC (and not a usermode exception), we only need to save the callee-save fpu registers. */
tbz w4, #(THREAD_EXCEPTION_FLAG_BIT_INDEX_IS_CALLING_SVC), 6f
tbnz w4, #(THREAD_EXCEPTION_FLAG_BIT_INDEX_IS_CALLING_SVC), 6f
5: /* Save the 32-bit caller-save fpu registers. */
ldr x6, [x2, #(THREAD_STACK_PARAMETERS_CALLER_SAVE_FPU_REGISTERS)]