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| author | Kevin O'Connor <kevin@koconnor.net> | 2009-06-10 21:56:01 -0400 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2009-06-10 21:56:01 -0400 |
| commit | c0693941fdb5118164a8161316fdf8e9ebb499d2 (patch) | |
| tree | 4c2ed73a666bed4a8742453262c5899f77f7bfde /Makefile | |
| parent | 0b04b78972939b8bf00c6b075b3592ea6b7dd643 (diff) | |
| download | seabios-c0693941fdb5118164a8161316fdf8e9ebb499d2.tar.gz | |
Do garbage collection of unused sections.
Implement -ffunction-sections and -fdata-sections in both 32bit and
16bit code.
Make sure all sections have unique names (even asm and discarded
sections).
Enhance tools/layoutrom.py script to find all sections reachable from
exported 16bit code - prune all other sections.
Mark sections with "export" if they can be visible outside of code -
these sections wont be dropped when pruning unused sections.
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 13 |
1 files changed, 8 insertions, 5 deletions
@@ -24,6 +24,7 @@ COMMONCFLAGS = -Wall -Os -MD -m32 -march=i386 -mregparm=3 \ -mpreferred-stack-boundary=2 -mrtd -freg-struct-return \ -ffreestanding -fwhole-program -fomit-frame-pointer \ -fno-delete-null-pointer-checks -Wno-strict-aliasing \ + -ffunction-sections -fdata-sections \ -minline-all-stringops COMMONCFLAGS += $(call cc-option,$(CC),-nopie,) COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector,) @@ -33,7 +34,6 @@ override CFLAGS = $(COMMONCFLAGS) -g -DMODE16=0 CFLAGS16INC = $(COMMONCFLAGS) -DMODE16=1 -fno-jump-tables -fno-defer-pop \ $(call cc-option,$(CC),-fno-tree-switch-conversion,) \ $(call cc-option,$(CC),--param large-stack-frame=4,) -CFLAGS16INC += -ffunction-sections -fdata-sections CFLAGS16 = $(CFLAGS16INC) -g all: $(OUT) $(OUT)bios.bin @@ -107,11 +107,14 @@ $(OUT)rom32.o: $(OUT)ccode32.o $(OUT)rombios32.lds @echo " Linking (no relocs) $@" $(Q)$(LD) -r -T $(OUT)rombios32.lds $< -o $@ -$(OUT)romlayout.lds: $(OUT)romlayout16.o +$(OUT)romlayout16.lds $(OUT)romlayout32.lds: $(OUT)ccode32.o $(OUT)romlayout16.o @echo " Building layout information $@" - $(Q)$(OBJDUMP) -h $< | ./tools/layoutrom.py $@ + $(Q)$(OBJDUMP) -thr $(OUT)ccode32.o > $(OUT)ccode32.o.objdump + $(Q)$(OBJDUMP) -thr $(OUT)romlayout16.o > $(OUT)romlayout16.o.objdump + $(Q)./tools/layoutrom.py $(OUT)romlayout16.o.objdump $(OUT)ccode32.o.objdump $(OUT)romlayout16.lds $(OUT)romlayout32.lds -$(OUT)layout16.lds: $(OUT)romlayout.lds +$(OUT)layout16.lds: $(OUT)romlayout16.lds +$(OUT)rombios32.lds: $(OUT)romlayout32.lds $(OUT)rom16.o: $(OUT)romlayout16.o $(OUT)rom32.o $(OUT)layout16.lds @echo " Linking (no relocs) $@" @@ -148,7 +151,7 @@ $(OUT)vgalayout16.o: vgaentry.S $(OUT)vgaccode.16.s $(OUT)asm-offsets.h $(OUT)vgarom.o: $(OUT)vgalayout16.o $(OUT)vgalayout.lds @echo " Linking $@" - $(Q)$(LD) -T $(OUT)vgalayout.lds $(OUT)vgalayout16.o -o $@ + $(Q)$(LD) --gc-sections -T $(OUT)vgalayout.lds $(OUT)vgalayout16.o -o $@ $(OUT)vgabios.bin.raw: $(OUT)vgarom.o @echo " Extracting binary $@" |