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std.debug: use the SP as the initial FP on SPARC

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The FP would point to the register save area for the previous frame, while the
SP points to the register save area for the current frame. So use the latter.
This commit is contained in:
Alex Rønne Petersen 2025-10-14 09:52:10 +02:00
parent 6de2d61a0c
commit 912fed3380
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1 changed files with 13 additions and 2 deletions
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15
lib/std/debug.zig
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@ -825,8 +825,19 @@ const StackIterator = union(enum) {
// in our caller's frame and above.
return .{ .di = .init(&.current()) };
}
flushSparcWindows();
return .{ .fp = @frameAddress() };
return .{
// On SPARC, the frame pointer will point to the previous frame's save area,
// meaning we will read the previous return address and thus miss a frame.
// Instead, start at the stack pointer so we get the return address from the
// current frame's save area. The addition of the stack bias cannot fail here
// since we know we have a valid stack pointer.
.fp = if (native_arch.isSPARC()) sp: {
flushSparcWindows();
break :sp asm (""
: [_] "={o6}" (-> usize),
) + stack_bias;
} else @frameAddress(),
};
}
fn deinit(si: *StackIterator) void {
switch (si.*) {