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authorLinus Torvalds <torvalds@linux-foundation.org>2018-03-31 07:26:48 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2018-03-31 07:26:48 -1000
commit93e04d4ad7c567f87388dd0338df7d8878ab65e9 (patch)
treeeefa261c2f597ed6a39a5785f76840357a071a12
parentb5dbc28762fd3fd40ba76303be0c7f707826f982 (diff)
parentbd6271039ee6f0c9b468148fc2d73e0584af6b4f (diff)
downloadlinux-sh-93e04d4ad7c567f87388dd0338df7d8878ab65e9.tar.gz
Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 PTI fixes from Ingo Molnar: "Two fixes: a relatively simple objtool fix that makes Clang built kernels work with ORC debug info, plus an alternatives macro fix" * 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/alternatives: Fixup alternative_call_2 objtool: Add Clang support
-rw-r--r--arch/x86/include/asm/alternative.h4
-rw-r--r--tools/objtool/check.c11
2 files changed, 12 insertions, 3 deletions
diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h
index cf5961ca8677..4cd6a3b71824 100644
--- a/arch/x86/include/asm/alternative.h
+++ b/arch/x86/include/asm/alternative.h
@@ -218,13 +218,11 @@ static inline int alternatives_text_reserved(void *start, void *end)
*/
#define alternative_call_2(oldfunc, newfunc1, feature1, newfunc2, feature2, \
output, input...) \
-{ \
asm volatile (ALTERNATIVE_2("call %P[old]", "call %P[new1]", feature1,\
"call %P[new2]", feature2) \
: output, ASM_CALL_CONSTRAINT \
: [old] "i" (oldfunc), [new1] "i" (newfunc1), \
- [new2] "i" (newfunc2), ## input); \
-}
+ [new2] "i" (newfunc2), ## input)
/*
* use this macro(s) if you need more than one output parameter
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 92b6a2c21631..5409f6f6c48d 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1386,6 +1386,17 @@ static int update_insn_state(struct instruction *insn, struct insn_state *state)
state->vals[op->dest.reg].offset = -state->stack_size;
}
+ else if (op->src.reg == CFI_BP && op->dest.reg == CFI_SP &&
+ cfa->base == CFI_BP) {
+
+ /*
+ * mov %rbp, %rsp
+ *
+ * Restore the original stack pointer (Clang).
+ */
+ state->stack_size = -state->regs[CFI_BP].offset;
+ }
+
else if (op->dest.reg == cfa->base) {
/* mov %reg, %rsp */