fixup zp

thehajime · Dec 12, 2024 · 9bbb23f · 9bbb23f
1 parent 53caeb4
commit 9bbb23f
Showing 1 changed file with 2 additions and 5 deletions.
diff --git a/arch/x86/um/nommu/zpoline.c b/arch/x86/um/nommu/zpoline.c
@@ -209,11 +209,8 @@ static int __init setup_zpoline_trampoline(void)
 	 * pretending to be syscall instruction by putting return
 	 * address in %rcx.
 	 */
-	/* 48 8b 0c 24               mov    (%rsp),%rcx */
-	__zpoline_start[ptr++] = 0x48;
-	__zpoline_start[ptr++] = 0x8b;
-	__zpoline_start[ptr++] = 0x0c;
-	__zpoline_start[ptr++] = 0x24;
+	/* 59                   pop    %rcx */
+	__zpoline_start[ptr++] = 0x59;
 
 	/* 41 ff e3                jmp    *%r11 */
 	__zpoline_start[ptr++] = 0x41;