Commit bb33421d authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

[PATCH] x86_64: Allow compilation on a 32bit biarch toolchain



This might help on distributions that use a 32bit biarch compiler.

First pass -m64 by default.

Secondly add some more .code32s because at least the Ubuntu biarch
32bit as called by gcc doesn't seem to handle -m64 -m32 as generated
by the Makefile without such assistance.

And finally make sure the linker script can be preprocessed
with a 32bit cpp.
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 79c62cf1
......@@ -31,6 +31,7 @@ cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
CFLAGS += $(cflags-y)
CFLAGS += -m64
CFLAGS += -mno-red-zone
CFLAGS += -mcmodel=kernel
CFLAGS += -pipe
......@@ -52,6 +53,8 @@ CFLAGS += $(call cc-option,-funit-at-a-time)
# prevent gcc from generating any FP code by mistake
CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
AFLAGS += -m64
head-y := arch/x86_64/kernel/head.o arch/x86_64/kernel/head64.o arch/x86_64/kernel/init_task.o
libs-y += arch/x86_64/lib/
......
......@@ -7,6 +7,7 @@
* by doing ".balign 32" must match in both versions of the page.
*/
.code32
.section .text.sigreturn,"ax"
.balign 32
.globl __kernel_sigreturn
......
......@@ -6,6 +6,7 @@
#include <asm/asm-offsets.h>
#include <asm/segment.h>
.code32
.text
.section .text.vsyscall,"ax"
.globl __kernel_vsyscall
......
......@@ -5,6 +5,7 @@
#include <asm/ia32_unistd.h>
#include <asm/asm-offsets.h>
.code32
.text
.section .text.vsyscall,"ax"
.globl __kernel_vsyscall
......
......@@ -8,6 +8,8 @@
#include <asm/page.h>
#include <linux/config.h>
#undef i386 /* in case the preprocessor is a 32bit one */
OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
OUTPUT_ARCH(i386:x86-64)
ENTRY(phys_startup_64)
......
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