65 lines
2.0 KiB
Makefile
65 lines
2.0 KiB
Makefile
#
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# Copyright (C) 2006 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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LOADADDR = 0x80400000 # RAM start + 4M
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KERNEL_ENTRY = 0x80001000
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RAMSIZE = 0x00100000 # 1MB
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IMAGE_COPY:=0
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CROSS_COMPILE = mips-linux-
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OBJCOPY:= $(CROSS_COMPILE)objcopy -O binary -R .reginfo -R .note -R .comment -R .mdebug -S
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CFLAGS := -fno-builtin -Os -G 0 -ffunction-sections -mno-abicalls -fno-pic -mabi=32 -march=mips32 -Wa,-32 -Wa,-march=mips32 -Wa,-mips32 -Wa,--trap -Wall -DRAMSIZE=${RAMSIZE} -DKERNEL_ENTRY=${KERNEL_ENTRY} -D_LZMA_IN_CB
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ifeq ($(IMAGE_COPY),1)
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CFLAGS += -DLOADADDR=${LOADADDR} -DIMAGE_COPY=1
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endif
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.S.s:
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$(CPP) $(CFLAGS) $< -o $*.s
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.S.o:
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$(CC) $(CFLAGS) -c $< -o $*.o
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.c.o:
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$(CC) $(CFLAGS) -c $< -o $*.o
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CC = $(CROSS_COMPILE)gcc
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LD = $(CROSS_COMPILE)ld
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OBJDUMP = $(CROSS_COMPILE)objdump
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O_FORMAT = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
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# Drop some uninteresting sections in the kernel.
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# This is only relevant for ELF kernels but doesn't hurt a.out
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drop-sections = .reginfo .mdebug .comment
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strip-flags = $(addprefix --remove-section=,$(drop-sections))
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all : lzma.elf
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lzma.lds: lzma.lds.in
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sed -e 's,@LOADADDR@,$(LOADADDR),g' -e 's,@ENTRY@,_start,g' $< >$@
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kernel.o: vmlinux.lzma lzma.lds
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$(LD) -r -b binary --oformat $(O_FORMAT) -o $@ $<
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ifeq ($(IMAGE_COPY),1)
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LOADER_ENTRY ?= $(KERNEL_ENTRY)
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lzma.o: decompress.o LzmaDecode.o kernel.o
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sed -e 's,@LOADADDR@,$(LOADADDR),g' -e 's,@ENTRY@,entry,g' lzma.lds.in >lzma-stage2.lds
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$(LD) -static --no-warn-mismatch -e entry -Tlzma-stage2.lds -o temp-$@ $^
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$(OBJCOPY) temp-$@ lzma.tmp
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@echo "SECTIONS { .data : { code_start = .; *(.data) code_stop = .; }}" > lzma-data.lds
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$(LD) -no-warn-mismatch -T lzma-data.lds -r -o $@ -b binary lzma.tmp --oformat $(O_FORMAT)
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lzma.elf: start.o lzma.o
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sed -e 's,@LOADADDR@,$(LOADER_ENTRY),g' lzma-copy.lds.in >lzma-copy.lds
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$(LD) -s -Tlzma-copy.lds -o $@ $^
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else
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lzma.elf: start.o decompress.o LzmaDecode.o kernel.o
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$(LD) -s -Tlzma.lds -o $@ $^
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endif
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clean:
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rm -f *.o lzma.elf *.tmp *.lds
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