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| author | Peter Zijlstra <peterz@infradead.org> | 2021-02-03 12:02:21 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-02-10 20:53:51 +0100 |
| commit | 87ccc826bf1c9e5ab4c2f649b404e02c63e47622 (patch) | |
| tree | e38d55a0877be33672867af408ecc512d44493ee /Documentation | |
| parent | x86/power: Support objtool validation in hibernate_asm_64.S (diff) | |
| download | linux-87ccc826bf1c9e5ab4c2f649b404e02c63e47622.tar.xz linux-87ccc826bf1c9e5ab4c2f649b404e02c63e47622.zip | |
x86/unwind/orc: Change REG_SP_INDIRECT
Currently REG_SP_INDIRECT is unused but means (%rsp + offset),
change it to mean (%rsp) + offset.
The reason is that we're going to swizzle stack in the middle of a C
function with non-trivial stack footprint. This means that when the
unwinder finds the ToS, it needs to dereference it (%rsp) and then add
the offset to the next frame, resulting in: (%rsp) + offset
This is somewhat unfortunate, since REG_BP_INDIRECT is used (by DRAP)
and thus needs to retain the current (%rbp + offset).
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions