start: Add a comment explaining the sparc64 stack bias.

2024-07-24 17:36:15 +02:00
parent 5c96192c19
commit 58e38ff1f8
1 changed files with 2 additions and 1 deletions
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -379,7 +379,8 @@ fn _start() callconv(.Naked) noreturn {
            \\ jg %[posixCallMainAndExit]
            ,
            .sparc64 =>
-            // argc is stored after a register window (16 registers) plus stack bias
+            // argc is stored after a register window (16 registers * 8 bytes) plus the stack bias
+            // (2047 bytes).
            \\ mov %%g0, %%i6
            \\ add %%o6, 2175, %%l0
            \\ mov %%l0, %%o0