From 5474d4338905e8535b13391f952830a15bc5eaeb Mon Sep 17 00:00:00 2001 From: Koakuma Date: Sun, 25 Oct 2020 21:51:01 +0700 Subject: Zero %i6 to terminate backchain --- lib/std/start.zig | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) (limited to 'lib') diff --git a/lib/std/start.zig b/lib/std/start.zig index 8bb9780e27..b1cbefcc67 100644 --- a/lib/std/start.zig +++ b/lib/std/start.zig @@ -148,13 +148,10 @@ fn _start() callconv(.Naked) noreturn { ); }, .sparcv9 => { - // On sparc64, the stack pointer register points to a place - // 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 is stored after a register window (16 registers) plus stack bias + starting_stack_ptr = asm ( + \\ mov %%g0, %%i6 + \\ add %%o6, 2175, %[argc] : [argc] "=r" (-> [*]usize) ); }, -- cgit v1.2.3