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Fix previous %fp calculation

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This commit is contained in:
Koakuma
2021-02-05 00:28:07 +07:00
parent d23dfdeab9
commit 448a28325c
1 changed files with 6 additions and 2 deletions
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8
lib/std/debug.zig
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@@ -360,7 +360,7 @@ pub const StackIterator = struct {
};
}
// Negative offset of the saved BP wrt the frame pointer.
// Offset of the saved BP wrt the frame pointer.
const fp_offset = if (builtin.arch.isRISCV())
// On RISC-V the frame pointer points to the top of the saved register
// area, on pretty much every other architecture it points to the stack
@@ -398,7 +398,11 @@ pub const StackIterator = struct {
}
fn next_internal(self: *StackIterator) ?usize {
const fp = math.sub(usize, self.fp, fp_offset) catch return null;
const fp = if (builtin.arch.isSPARC())
// On SPARC the offset is positive. (!)
math.add(usize, self.fp, fp_offset) catch return null
else
math.sub(usize, self.fp, fp_offset) catch return null;
// Sanity check.
if (fp == 0 or !mem.isAligned(fp, @alignOf(usize)))