arch/x68_64: properly align ap boot stack for vector operations

Signed-off-by: liwenxiang1 <liwenxiang1@xiaomi.com>
2026-05-23 06:39:01 +08:00 · 2024-10-09 16:46:19 +08:00
parent b4c4cbc28b
commit 5e15fff58a
1 changed files with 7 additions and 0 deletions
@@ -398,6 +398,13 @@ ap_start:

 	/* Jump to ap_start routine */
 	movabs  $x86_64_ap_boot,   %rbx
+
+	/* We need to simulate the behavior of the call instruction, which by
+	 * default pushes 8 bytes of the RIP. Otherwise, the function's stack
+	 * won't be 16-byte aligned.
+	 */
+
+	pushq   $0
 	jmp     *%rbx
 #endif