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| Started by | Dmitry Vyukov <dvyukov@google.com> |
|---|---|
| First post | 2016-06-22 19:40 +0200 |
| Last post | 2016-06-22 22:20 +0200 |
| Articles | 2 — 1 participant |
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[PATCH] x86: prevent gcc from emitting SSE into boot code Dmitry Vyukov <dvyukov@google.com> - 2016-06-22 19:40 +0200
Re: [PATCH] x86: prevent gcc from emitting SSE into boot code Dmitry Vyukov <dvyukov@google.com> - 2016-06-22 22:20 +0200
| From | Dmitry Vyukov <dvyukov@google.com> |
|---|---|
| Date | 2016-06-22 19:40 +0200 |
| Subject | [PATCH] x86: prevent gcc from emitting SSE into boot code |
| Message-ID | <rMUi5-6sA-7@gated-at.bofh.it> |
Latest gcc manages to emit MOVDQA into boot code which leads to crashes. Add more -mno-see flags. Signed-off-by: Dmitry Vyukov <dvyukov@google.com> --- arch/x86/boot/compressed/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index f135688..7eaafb8 100644 --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -31,7 +31,7 @@ KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING cflags-$(CONFIG_X86_32) := -march=i386 cflags-$(CONFIG_X86_64) := -mcmodel=small KBUILD_CFLAGS += $(cflags-y) -KBUILD_CFLAGS += -mno-mmx -mno-sse +KBUILD_CFLAGS += -mno-mmx -mno-sse -mno-sse2 -mno-sse3 KBUILD_CFLAGS += $(call cc-option,-ffreestanding) KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) -- 2.8.0.rc3.226.g39d4020
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| From | Dmitry Vyukov <dvyukov@google.com> |
|---|---|
| Date | 2016-06-22 22:20 +0200 |
| Message-ID | <rMWMW-87F-3@gated-at.bofh.it> |
| In reply to | #1429020 |
On Wed, Jun 22, 2016 at 7:37 PM, Dmitry Vyukov <dvyukov@google.com> wrote: > Latest gcc manages to emit MOVDQA into boot code > which leads to crashes. Add more -mno-see flags. > > Signed-off-by: Dmitry Vyukov <dvyukov@google.com> > --- > arch/x86/boot/compressed/Makefile | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile > index f135688..7eaafb8 100644 > --- a/arch/x86/boot/compressed/Makefile > +++ b/arch/x86/boot/compressed/Makefile > @@ -31,7 +31,7 @@ KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING > cflags-$(CONFIG_X86_32) := -march=i386 > cflags-$(CONFIG_X86_64) := -mcmodel=small > KBUILD_CFLAGS += $(cflags-y) > -KBUILD_CFLAGS += -mno-mmx -mno-sse > +KBUILD_CFLAGS += -mno-mmx -mno-sse -mno-sse2 -mno-sse3 > KBUILD_CFLAGS += $(call cc-option,-ffreestanding) > KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) > > -- > 2.8.0.rc3.226.g39d4020 I withdraw this patch. From off-list discussion: "-mno-sse alone should disable all SSE/AVX instructions. If not, please file a GCC bug report".
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