arm64/syscall: (Re-)enable interrupts only if they were previously enabled

Don't change the CPU state unexpectedly
2026-09-20 12:58:29 +08:00 · 2024-09-11 19:51:35 +08:00
parent 498275ca43
commit 87d9dac817
1 changed files with 6 additions and 0 deletions
@@ -222,7 +222,13 @@ SECTION_FUNC(text, arm64_sync_exc)

    /* Call dispatch_syscall() on the kernel stack with interrupts enabled */

+    mrs    x10, spsr_el1
+    and    x10, x10, #IRQ_SPSR_MASK
+    cmp    x10, xzr
+    bne    1f
    msr    daifclr, #IRQ_DAIF_MASK /* Re-enable interrupts */
+
+1:
    bl     dispatch_syscall
    msr    daifset, #IRQ_DAIF_MASK /* Disable interrupts */