Commit 792526c0bd45754bced18298573ad2a145a7141e | zig

author	Koakuma <koachan@protonmail.com> 2020-10-24 19:54:58+07:00
committer	Koakuma <koachan@protonmail.com> 2020-10-24 20:05:36+07:00
log	792526c0bd45754bced18298573ad2a145a7141e
tree	d2d923c3d6b837c68b86703d5a816a0222bcfaed
parent	cdbf66e36ec110993347e5158005ec1cc0adaf13

1 files changed, 8 insertions(+), 2 deletions(-)

lib/std/start.zig+8-2

 @@ -148,8 +148,14 @@ fn _start() callconv(.Naked) noreturn {
             );
         },
         .sparcv9 => {
-            starting_stack_ptr = asm (""
+            // On sparc64, the stack pointer register points to a place
-                : [argc] "={o6}" (-> [*]usize)
+            // 2047 bytes below the actual stack. Also, argc and friends are
+            // placed starting at [stack-start + 128], so we need to account for that too.
+            // Ref: System V Application Binary Interface: SPARC Version 9 Processor Supplement
+            // Version 1.35, figure 3-16.
+            // TODO: find a better way to do this.
+            starting_stack_ptr = asm ("add %%o6, 2175, %[argc]"
+                : [argc] "=r" (-> [*]usize)
             );
         },
         else => @compileError("unsupported arch"),