Initialize the ppc stack frame correctly

2021-04-10 12:58:21 -05:00
parent 2e85eb2bf8
commit 073d8e55c3
1 changed files with 6 additions and 3 deletions
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -198,13 +198,16 @@ fn _start() callconv(.Naked) noreturn {
            );
        },
        .powerpc => {
+            // Setup the initial stack frame and clear the back chain pointer.
            argc_argv_ptr = asm volatile (
-                \\ mr 3, 1
+                \\ mr 4, 1
                \\ li 0, 0
+                \\ stwu 1,-16(1)
+                \\ stw 0, 0(1)
                \\ mtlr 0
-                : [argc] "={r3}" (-> [*]usize)
+                : [argc] "={r4}" (-> [*]usize)
                :
-                : "r0", "r3"
+                : "r0"
            );
        },
        .powerpc64le => {