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optionrom: fix compilation with mingw docker target

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Two fixes are needed.  First, mingw does not have -D_FORTIFY_SOURCE,
hence --enable-debug disables optimization.  This is not acceptable
for ROMs, which should override CFLAGS to force inclusion of -O2.

Second, PE stores global constructors and destructors using the
following linker script snippet:

     ___CTOR_LIST__ = .; __CTOR_LIST__ = . ;
			LONG (-1);*(.ctors); *(.ctor); *(SORT(.ctors.*));  LONG (0);
     ___DTOR_LIST__ = .; __DTOR_LIST__ = . ;
			LONG (-1); *(.dtors); *(.dtor); *(SORT(.dtors.*));  LONG (0);

The LONG directives cause the .img files to be 16 bytes too large;
the recently added check to signrom.py catches this.  To fix this,
replace -T and -e options with a linker script.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-08-09 22:50:40 +02:00
parent b0e8f5cadc
commit 9d4cd7b4ed
2 changed files with 15 additions and 1 deletions
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10
pc-bios/optionrom/Makefile
View file

@ -9,6 +9,14 @@ $(call set-vpath, $(SRC_PATH)/pc-bios/optionrom)
.PHONY : all clean build-all
# Compiling with no optimization creates ROMs that are too large
ifeq ($(filter -O%, $(CFLAGS)),)
override CFLAGS += -O2
endif
ifeq ($(filter -O%, $(CFLAGS)),-O0)
override CFLAGS += -O2
endif
# Drop -fstack-protector and the like
QEMU_CFLAGS := $(filter -W%, $(QEMU_CFLAGS)) $(CFLAGS_NOPIE) -ffreestanding
QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -fno-stack-protector)
@ -51,7 +59,7 @@ endif
endif
%.img: %.o
$(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m $(LD_EMULATION) -Ttext 0 -e _start -s -o $@ $<," Building $(TARGET_DIR)$@")
$(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m $(LD_EMULATION) -T $(SRC_PATH)/pc-bios/optionrom/flat.lds -s -o $@ $<," Building $(TARGET_DIR)$@")
%.raw: %.img
$(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@," Building $(TARGET_DIR)$@")

6
pc-bios/optionrom/flat.lds Normal file
View file

@ -0,0 +1,6 @@
SECTIONS
{
. = 0;
.text : { *(.text) *(.text.$) }
}
ENTRY(_start)