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[PATCH] uml: allow building as 32-bit binary on 64bit host

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This patch makes the command:

make ARCH=um SUBARCH=i386

work on x86_64 hosts (with support for building 32-bit binaries).  This is
especially needed since 64-bit UMLs don't support 32-bit emulation for guest
binaries, currently.  This has been tested in all possible cases and works.

Only exception is that I've built but not tested a 64-bit binary, because I
hadn't a 64-bit filesystem available.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2005-07-14 00:33:43 -07:00 committed by Linus Torvalds
parent ecc354a90a
commit 20d0021394
4 changed files with 31 additions and 21 deletions
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11
arch/um/Makefile
View File

@ -51,11 +51,6 @@ MRPROPER_DIRS += $(ARCH_DIR)/include2
endif
SYS_DIR := $(ARCH_DIR)/include/sysdep-$(SUBARCH)
include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
core-y += $(SUBARCH_CORE)
libs-y += $(SUBARCH_LIBS)
# -Dvmap=kernel_vmap affects everything, and prevents anything from
# referencing the libpcap.o symbol so named.
@ -64,7 +59,7 @@ CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
USER_CFLAGS := $(patsubst -I%,,$(CFLAGS))
USER_CFLAGS := $(patsubst -D__KERNEL__,,$(USER_CFLAGS)) $(ARCH_INCLUDE) \
$(MODE_INCLUDE) $(ARCH_USER_CFLAGS)
$(MODE_INCLUDE)
# -Derrno=kernel_errno - This turns all kernel references to errno into
# kernel_errno to separate them from the libc errno. This allows -fno-common
@ -74,6 +69,8 @@ USER_CFLAGS := $(patsubst -D__KERNEL__,,$(USER_CFLAGS)) $(ARCH_INCLUDE) \
CFLAGS += -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask
CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
#This will adjust *FLAGS accordingly to the platform.
include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
@ -132,7 +129,7 @@ CPPFLAGS_vmlinux.lds = -U$(SUBARCH) \
#The wrappers will select whether using "malloc" or the kernel allocator.
LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
CFLAGS_vmlinux = $(LINK-y) $(LINK_WRAPS)
CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS)
define cmd_vmlinux__
$(CC) $(CFLAGS_vmlinux) -o $@ \
-Wl,-T,$(vmlinux-lds) $(vmlinux-init) \

31
arch/um/Makefile-i386
View File

@ -1,4 +1,4 @@
SUBARCH_CORE := arch/um/sys-i386/ arch/i386/crypto/
core-y += arch/um/sys-i386/ arch/i386/crypto/
TOP_ADDR := $(CONFIG_TOP_ADDR)
@ -8,21 +8,32 @@ ifeq ($(CONFIG_MODE_SKAS),y)
endif
endif
LDFLAGS += -m elf_i386
ELF_ARCH := $(SUBARCH)
ELF_FORMAT := elf32-$(SUBARCH)
OBJCOPYFLAGS := -O binary -R .note -R .comment -S
ifeq ("$(origin SUBARCH)", "command line")
ifneq ("$(shell uname -m | sed -e s/i.86/i386/)", "$(SUBARCH)")
CFLAGS += $(call cc-option,-m32)
USER_CFLAGS += $(call cc-option,-m32)
HOSTCFLAGS += $(call cc-option,-m32)
HOSTLDFLAGS += $(call cc-option,-m32)
AFLAGS += $(call cc-option,-m32)
LINK-y += $(call cc-option,-m32)
UML_OBJCOPYFLAGS += -F $(ELF_FORMAT)
export LDFLAGS HOSTCFLAGS HOSTLDFLAGS UML_OBJCOPYFLAGS
endif
endif
CFLAGS += -U__$(SUBARCH)__ -U$(SUBARCH) $(STUB_CFLAGS)
ARCH_USER_CFLAGS :=
ifneq ($(CONFIG_GPROF),y)
ARCH_CFLAGS += -DUM_FASTCALL
endif
ELF_ARCH := $(SUBARCH)
ELF_FORMAT := elf32-$(SUBARCH)
OBJCOPYFLAGS := -O binary -R .note -R .comment -S
SYS_UTIL_DIR := $(ARCH_DIR)/sys-i386/util
SYS_HEADERS := $(SYS_DIR)/sc.h $(SYS_DIR)/thread.h
SYS_HEADERS := $(SYS_DIR)/sc.h $(SYS_DIR)/thread.h
prepare: $(SYS_HEADERS)

6
arch/um/Makefile-x86_64
View File

@ -1,11 +1,13 @@
# Copyright 2003 - 2004 Pathscale, Inc
# Released under the GPL
SUBARCH_LIBS := arch/um/sys-x86_64/
libs-y += arch/um/sys-x86_64/
START := 0x60000000
#We #undef __x86_64__ for kernelspace, not for userspace where
#it's needed for headers to work!
CFLAGS += -U__$(SUBARCH)__ -fno-builtin $(STUB_CFLAGS)
ARCH_USER_CFLAGS := -D__x86_64__
USER_CFLAGS += -fno-builtin
ELF_ARCH := i386:x86-64
ELF_FORMAT := elf64-x86-64

4
arch/um/scripts/Makefile.unmap
View File

@ -12,8 +12,8 @@ $(obj)/unmap.o: _c_flags = $(call unprofile,$(CFLAGS))
quiet_cmd_wrapld = LD $@
define cmd_wrapld
$(LD) -r -o $(obj)/unmap_tmp.o $< $(shell $(CC) -print-file-name=libc.a); \
$(OBJCOPY) $(obj)/unmap_tmp.o $@ -G switcheroo
$(LD) $(LDFLAGS) -r -o $(obj)/unmap_tmp.o $< $(shell $(CC) $(CFLAGS) -print-file-name=libc.a); \
$(OBJCOPY) $(UML_OBJCOPYFLAGS) $(obj)/unmap_tmp.o $@ -G switcheroo
endef
$(obj)/unmap_fin.o : $(obj)/unmap.o FORCE