Fix the bug that the modified version of __syscall6() messes up the stack by poping an argument (a6)

2022-04-03 09:52:17 +08:00 · 2022-04-03 09:52:17 +08:00 · 5013f777b5
commit 5013f777b5
parent 498d111c93
1 changed files with 3 additions and 1 deletions
--- a/src/internal/x86_64/syscall.S
+++ b/src/internal/x86_64/syscall.S
@ -45,6 +45,8 @@ __syscall6:
 	movq	%rcx,	%rdx
 	movq	%r8,	%r10
 	movq	%r9,	%r8
-	popq	%r9		// The last argument is stored on the stack
+	movq	(%rsp),	%r9		// The last argument is stored on
+					// the stack
+					// But do NOT mess up the stack
 	syscall
 	retq