So that it can be used by other components apart from the efi specific
code. By moving the detection code creating a dummy efi/disabled file
can be avoided.
This is required so that the conditional used to define the efi symbol
in the linker script can be removed and instead the definition of the
efi symbol can be guarded using the preprocessor.
The motivation behind this change is to be able to build Xen using lld
(the LLVM linker), that at least on version 6.0.0 doesn't work
properly with a DEFINED being used in a conditional expression:
ld-melf_x86_64_fbsd -T xen.lds -N prelink.o --build-id=sha1 \
/root/src/xen/xen/common/symbols-dummy.o -o /root/src/xen/xen/.xen-syms.0
ld: error: xen.lds:233: symbol not found: efi
Signed-off-by: Roger Pau Monné
---
Cc: Jan Beulich
Cc: Andrew Cooper
Cc: Daniel Kiper
---
Changes since v1:
- Rename variable.
- Remove usage of the efi/disabled file.
---
.gitignore| 1 -
xen/arch/x86/Makefile | 11 +--
xen/arch/x86/efi/Makefile | 11 +++
xen/arch/x86/xen.lds.S| 4 +++-
4 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/.gitignore b/.gitignore
index 5b8448d8f7..aa6856c2b9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -302,7 +302,6 @@ xen/arch/x86/boot/*.bin
xen/arch/x86/boot/*.lnk
xen/arch/x86/efi.lds
xen/arch/x86/efi/check.efi
-xen/arch/x86/efi/disabled
xen/arch/x86/efi/mkreloc
xen/arch/*/efi/boot.c
xen/arch/*/efi/compat.c
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 5563c813dd..2172a07071 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -163,10 +163,17 @@ EFI_LDFLAGS += --minor-image-version=$(XEN_SUBVERSION)
EFI_LDFLAGS += --major-os-version=2 --minor-os-version=0
EFI_LDFLAGS += --major-subsystem-version=2 --minor-subsystem-version=0
+# Check if the build system supports PE.
+XEN_BUILD_PE := $(shell $(CC) $(filter-out $(CFLAGS-y) .%.d,$(CFLAGS)) -c
efi/check.c -o efi/check.o 2>/dev/null && echo y)
+export XEN_BUILD_PE := $(if $(XEN_BUILD_PE),$(shell $(LD) -mi386pep
--subsystem=10 -o efi/check.efi efi/check.o 2>/dev/null && echo y))
+ifeq ($(XEN_BUILD_PE),y)
+CFLAGS += -DXEN_BUILD_PE
+endif
+
$(TARGET).efi: VIRT_BASE = 0x$(shell $(NM) efi/relocs-dummy.o | sed -n 's, A
VIRT_START$$,,p')
$(TARGET).efi: ALT_BASE = 0x$(shell $(NM) efi/relocs-dummy.o | sed -n 's, A
ALT_START$$,,p')
# Don't use $(wildcard ...) here - at least make 3.80 expands this too early!
-$(TARGET).efi: guard = $(if $(shell echo efi/dis* | grep disabled),:)
+$(TARGET).efi: guard = $(if $(XEN_BUILD_PE),,:)
ifneq ($(build_id_linker),)
ifeq ($(call ld-ver-build-id,$(LD) $(filter -m%,$(EFI_LDFLAGS))),y)
@@ -232,6 +239,6 @@ efi/mkreloc: efi/mkreloc.c
clean::
rm -f asm-offsets.s *.lds boot/*.o boot/*~ boot/core boot/mkelf32
rm -f $(BASEDIR)/.xen-syms.[0-9]* boot/.*.d
- rm -f $(BASEDIR)/.xen.efi.[0-9]* efi/*.efi efi/disabled efi/mkreloc
+ rm -f $(BASEDIR)/.xen.efi.[0-9]* efi/*.efi efi/mkreloc
rm -f boot/cmdline.S boot/reloc.S boot/*.lnk boot/*.bin
rm -f note.o
diff --git a/xen/arch/x86/efi/Makefile b/xen/arch/x86/efi/Makefile
index 3be9661108..918383b325 100644
--- a/xen/arch/x86/efi/Makefile
+++ b/xen/arch/x86/efi/Makefile
@@ -1,16 +1,11 @@
CFLAGS += -fshort-wchar
-efi := y$(shell rm -f disabled)
-efi := $(if $(efi),$(shell $(CC) $(filter-out $(CFLAGS-y) .%.d,$(CFLAGS)) -c
check.c 2>disabled && echo y))
-efi := $(if $(efi),$(shell $(LD) -mi386pep --subsystem=10 -o check.efi check.o
2>disabled && echo y))
-efi := $(if $(efi),$(shell rm disabled)y)
-
%.o: %.ihex
$(OBJCOPY) -I ihex -O binary $< $@
boot.init.o: buildid.o
obj-y := stub.o
-obj-$(efi) := boot.init.o compat.o relocs-dummy.o runtime.o
-extra-$(efi) += buildid.o
-nocov-$(efi) += stub.o
+obj-$(XEN_BUILD_PE) := boot.init.o compat.o relocs-dummy.o runtime.o
+extra-$(XEN_BUILD_PE) += buildid.o
+nocov-$(XEN_BUILD_PE) += stub.o
diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index 326e885402..4a59467986 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -304,7 +304,9 @@ SECTIONS
} :text
#endif
- efi = DEFINED(efi) ? efi : .;
+#ifndef XEN_BUILD_PE
+ efi = .;
+#endif
/* Sections to be discarded */
/DISCARD/ : {
--
2.17.1
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