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Fix sparc64 argument loading

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This commit is contained in:
Koakuma 2020-10-24 19:54:58 +07:00
parent cdbf66e36e
commit 792526c0bd
1 changed files with 8 additions and 2 deletions
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10
lib/std/start.zig
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@ -148,8 +148,14 @@ fn _start() callconv(.Naked) noreturn {
);
},
.sparcv9 => {
starting_stack_ptr = asm (""
: [argc] "={o6}" (-> [*]usize)
// 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] "=r" (-> [*]usize)
);
},
else => @compileError("unsupported arch"),