Commit ce81525f3f

Alex Rønne Petersen <alex@alexrp.com>
2024-07-24 17:36:34
start: Align the stack on s390x just in case.
The kernel does this as required, but we cannot trust dynamic linkers to do it.
master
1 parent 52653ec
Changed files (1)
lib
std
start.zig
lib/std/start.zig
@@ -373,8 +373,9 @@ fn _start() callconv(.Naked) noreturn {
             ,
             .s390x =>
             // Set up the stack frame (register save area and cleared back-chain slot).
-            // Note: Stack pointer is guaranteed by ABI to be 8-byte aligned as required.
             \\ lgr %r2, %r15
+            \\ lghi %r0, -16
+            \\ ngr %r15, %r0
             \\ aghi %r15, -160
             \\ lghi %r0, 0
             \\ stg  %r0, 0(%r15)