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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-03-31 19:26:48 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-03-31 19:26:48 +0200 |
| commit | 93e04d4ad7c567f87388dd0338df7d8878ab65e9 (patch) | |
| tree | eefa261c2f597ed6a39a5785f76840357a071a12 | |
| parent | Merge tag 'kbuild-fixes-v4.16-3' of git://git.kernel.org/pub/scm/linux/kernel... (diff) | |
| parent | x86/alternatives: Fixup alternative_call_2 (diff) | |
| download | linux-93e04d4ad7c567f87388dd0338df7d8878ab65e9.tar.xz linux-93e04d4ad7c567f87388dd0338df7d8878ab65e9.zip | |
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.h | 4 | ||||
| -rw-r--r-- | tools/objtool/check.c | 11 |
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 */ |