54 lines
1.8 KiB
Diff
54 lines
1.8 KiB
Diff
From d703c370c78578b63e7b5e04a3801c7f5fbf0c94 Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Fri, 31 May 2013 15:00:11 -0400
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Subject: [PATCH] Disable MMX and SSE.
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GCC 4.8.0 adds some optimizations that will use movups/movaps (and use
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%xmm* registers) when they're faster, and of course that won't work at
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all since UEFI firmwares aren't guaranteed to initialize the mmx/sse
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instructions.
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This will be even more annoying, since most UEFI firmwares don't
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initialize the #DE or #UD trap handlers, and your backtrace will be a
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random path through uninitialized memory, occasionally including
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whatever address the IDT has for #UD, but also addresses like "0x4" and
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"0x507" that you don't normally expect to see in your call path.
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---
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Make.defaults | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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diff --git a/Make.defaults b/Make.defaults
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index 0585915..ea7513e 100644
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--- a/Make.defaults
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+++ b/Make.defaults
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@@ -60,7 +60,9 @@ CPPFLAGS = -DCONFIG_$(ARCH)
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ifeq ($(GCCNEWENOUGH),1)
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CPPFLAGS += -DGNU_EFI_USE_MS_ABI -maccumulate-outgoing-args --std=c11
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endif
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-CFLAGS = $(ARCH3264) -O2 -fpic -Wall -fshort-wchar -fno-strict-aliasing -fno-merge-constants -ffreestanding -fno-stack-protector -fno-stack-check
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+CFLAGS = $(ARCH3264) -O2 -fpic -Wall -fshort-wchar -fno-strict-aliasing \
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+ -fno-merge-constants -ffreestanding -fno-stack-protector \
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+ -fno-stack-check
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ASFLAGS = $(ARCH3264)
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LDFLAGS = -nostdlib --no-undefined
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INSTALL = install
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@@ -78,13 +80,14 @@ ifeq ($(ARCH),ia64)
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endif
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ifeq ($(ARCH), ia32)
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+ CFLAGS += -mno-mmx -mno-sse
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ifeq ($(HOSTARCH), x86_64)
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ARCH3264 = -m32
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endif
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endif
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ifeq ($(ARCH), x86_64)
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- CFLAGS += -mno-red-zone
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+ CFLAGS += -mno-red-zone -mno-mmx -mno-sse
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ifeq ($(HOSTARCH), ia32)
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ARCH3264 = -m64
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endif
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--
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1.8.2.1
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