From: Andi Kleen Date: Wed, 11 Jan 2006 21:43:54 +0000 (+0100) Subject: [PATCH] x86_64: Allow compilation on a 32bit biarch toolchain X-Git-Tag: v2.6.16-rc1~350 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bb33421dde79f9a36d5485c56335ff178ac7d268;p=linux-2.6 [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: Andi Kleen Signed-off-by: Linus Torvalds --- diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile index 2d3e9be229..d7fd46479c 100644 --- a/arch/x86_64/Makefile +++ b/arch/x86_64/Makefile @@ -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/ diff --git a/arch/x86_64/ia32/vsyscall-sigreturn.S b/arch/x86_64/ia32/vsyscall-sigreturn.S index 8b5a4b060b..d90321fe9b 100644 --- a/arch/x86_64/ia32/vsyscall-sigreturn.S +++ b/arch/x86_64/ia32/vsyscall-sigreturn.S @@ -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 diff --git a/arch/x86_64/ia32/vsyscall-syscall.S b/arch/x86_64/ia32/vsyscall-syscall.S index b024965bb6..cf9ef678de 100644 --- a/arch/x86_64/ia32/vsyscall-syscall.S +++ b/arch/x86_64/ia32/vsyscall-syscall.S @@ -6,6 +6,7 @@ #include #include + .code32 .text .section .text.vsyscall,"ax" .globl __kernel_vsyscall diff --git a/arch/x86_64/ia32/vsyscall-sysenter.S b/arch/x86_64/ia32/vsyscall-sysenter.S index 71f3de586b..ae056e553d 100644 --- a/arch/x86_64/ia32/vsyscall-sysenter.S +++ b/arch/x86_64/ia32/vsyscall-sysenter.S @@ -5,6 +5,7 @@ #include #include + .code32 .text .section .text.vsyscall,"ax" .globl __kernel_vsyscall diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S index 4cbbe7c488..b0eed1faf7 100644 --- a/arch/x86_64/kernel/vmlinux.lds.S +++ b/arch/x86_64/kernel/vmlinux.lds.S @@ -8,6 +8,8 @@ #include #include +#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)