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authorPeter Zijlstra <peterz@infradead.org>2021-02-03 14:02:21 +0300
committerPeter Zijlstra <peterz@infradead.org>2021-02-10 22:53:51 +0300
commit87ccc826bf1c9e5ab4c2f649b404e02c63e47622 (patch)
treee38d55a0877be33672867af408ecc512d44493ee /tools/objtool
parent9077c016a39c78054f03e0354ad8409b47af68dc (diff)
downloadlinux-87ccc826bf1c9e5ab4c2f649b404e02c63e47622.tar.xz
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 'tools/objtool')
-rw-r--r--tools/objtool/orc_dump.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c
index c53fae9dbe93..f5a8508c42d6 100644
--- a/tools/objtool/orc_dump.c
+++ b/tools/objtool/orc_dump.c
@@ -55,7 +55,7 @@ static void print_reg(unsigned int reg, int offset)
if (reg == ORC_REG_BP_INDIRECT)
printf("(bp%+d)", offset);
else if (reg == ORC_REG_SP_INDIRECT)
- printf("(sp%+d)", offset);
+ printf("(sp)%+d", offset);
else if (reg == ORC_REG_UNDEFINED)
printf("(und)");
else