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authorPaolo Bonzini <pbonzini@redhat.com>2016-08-09 22:50:40 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2016-08-09 22:57:36 +0200
commit9d4cd7b4ed413a1371997ce74da39900b2a8473b (patch)
tree6e4865a2cb57b9ad3e03fc7ad6b5b9d5c3b2c64e /pc-bios
parentb0e8f5cadcce7c1e2047e1e2c96f827a26171f58 (diff)
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optionrom: fix compilation with mingw docker target
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>
Diffstat (limited to 'pc-bios')
-rw-r--r--pc-bios/optionrom/Makefile10
-rw-r--r--pc-bios/optionrom/flat.lds6
2 files changed, 15 insertions, 1 deletions
diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
index 9c018ea..8aef152 100644
--- a/pc-bios/optionrom/Makefile
+++ b/pc-bios/optionrom/Makefile
@@ -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 $(TARGET_DIR)$@")
diff --git a/pc-bios/optionrom/flat.lds b/pc-bios/optionrom/flat.lds
new file mode 100644
index 0000000..cee2eda
--- /dev/null
+++ b/pc-bios/optionrom/flat.lds
@@ -0,0 +1,6 @@
+SECTIONS
+{
+ . = 0;
+ .text : { *(.text) *(.text.$) }
+}
+ENTRY(_start)