From 3ba69c887bdde4795e52a88ff37964e55766d09c Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sat, 7 Jun 2025 18:00:47 -0400
Subject: kernel/amd64: Save %RCX before calling handler

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/amd64/vector.S | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'sys/arch')

diff --git a/sys/arch/amd64/amd64/vector.S b/sys/arch/amd64/amd64/vector.S
index d2a3d89..e348ff4 100644
--- a/sys/arch/amd64/amd64/vector.S
+++ b/sys/arch/amd64/amd64/vector.S
@@ -52,7 +52,9 @@ ioapic_common_func:
 
     mov (%rdx), %rbx            // intr_hand.func
     xor %rdi, %rdi              // No data
+    push %rcx                   // Save our counter
     call *%rbx                  // Call the handler
+    pop %rcx                    // Restore our counter
     or %rax, %rax               // Was it theirs? (RET >= 1)
     jnz done                    // Yes, we are done.
 1:  inc %rcx                    // Next
-- 
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