generic lzma loader: add support for memory copying, preserve prom arguments
SVN-Revision: 3908
This commit is contained in:
Felix Fietkau
parent
11b8b8af73
commit
829c95db10
6 changed files with 80 additions and 12 deletions
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@ -17,7 +17,8 @@ $(PKG_BUILD_DIR)/lzma.elf: $(PKG_BUILD_DIR)/.prepared $(PKG_BUILD_DIR)/vmlinux.l
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LD=$(TARGET_CROSS)ld CROSS_COMPILE=$(TARGET_CROSS) \
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RAMSIZE=$(RAMSIZE) \
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LOADADDR=$(LOADADDR) \
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KERNEL_ENTRY=$(KERNEL_ENTRY)
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KERNEL_ENTRY=$(KERNEL_ENTRY) \
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IMAGE_COPY=$(IMAGE_COPY)
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$(PKG_BUILD_DIR)/vmlinux.lzma: $(KDIR)/vmlinux.lzma
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@ -1,9 +1,16 @@
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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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@ -13,12 +20,8 @@ CROSS_COMPILE = mips-linux-
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CC = $(CROSS_COMPILE)gcc
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LD = $(CROSS_COMPILE)ld
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OBJCOPY = $(CROSS_COMPILE)objcopy
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OBJDUMP = $(CROSS_COMPILE)objdump
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CFLAGS = -fno-builtin -Os -G 0 -mno-abicalls -fno-pic -Wall -DRAMSIZE=${RAMSIZE} -DKERNEL_ENTRY=${KERNEL_ENTRY} -D_LZMA_IN_CB
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# CFLAGS = -fno-builtin -Os -G 0 -mno-abicalls -fno-pic -Wall -DRAMSIZE=${RAMSIZE}
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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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@ -26,17 +29,29 @@ O_FORMAT = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
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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' $< >$@
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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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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 $(O_FORMAT)
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lzma.elf: start.o lzma.o
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sed -e 's,@LOADADDR@,$(KERNEL_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
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rm -f *.o lzma.elf *.tmp *.lds
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@ -106,6 +106,13 @@ void entry(unsigned long icache_size, unsigned long icache_lsize,
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{
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unsigned int i; /* temp value */
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unsigned int osize; /* uncompressed size */
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volatile unsigned int arg0, arg1, arg2, arg3;
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/* restore argument registers */
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__asm__ __volatile__ ("ori %0, $12, 0":"=r"(arg0));
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__asm__ __volatile__ ("ori %0, $13, 0":"=r"(arg1));
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__asm__ __volatile__ ("ori %0, $14, 0":"=r"(arg2));
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__asm__ __volatile__ ("ori %0, $15, 0":"=r"(arg3));
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ILzmaInCallback callback;
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CLzmaDecoderState vs;
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@ -142,6 +149,6 @@ void entry(unsigned long icache_size, unsigned long icache_lsize,
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blast_icache(icache_size, icache_lsize);
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/* Jump to load address */
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((void (*)(void)) KERNEL_ENTRY)();
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((void (*)(int a0, int a1, int a2, int a3)) KERNEL_ENTRY)(arg0, arg1, arg2, arg3);
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}
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}
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@ -0,0 +1,20 @@
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OUTPUT_ARCH(mips)
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ENTRY(_start)
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SECTIONS
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{
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/* Read-only sections, merged into text segment: */
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. = @LOADADDR@;
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.text :
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{
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_ftext = . ;
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*(.text)
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*(.rodata)
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} =0
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.reginfo : { *(.reginfo) }
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.bss :
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{
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*(.bss)
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}
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}
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@ -1,5 +1,5 @@
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OUTPUT_ARCH(mips)
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ENTRY(_start)
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ENTRY(@ENTRY@)
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SECTIONS
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{
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/* Read-only sections, merged into text segment: */
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@ -7,6 +7,7 @@ SECTIONS
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.text :
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{
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_ftext = . ;
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*(.text.entry)
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*(.text)
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*(.rodata)
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lzma_start = .;
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@ -34,10 +34,30 @@ LEAF(_start)
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.set mips32
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.set noreorder
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/* save argument registers */
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move t4, a0
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move t5, a1
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move t6, a2
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move t7, a3
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/* set up stack */
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li sp, 0xa0000000 + RAMSIZE - 16
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#ifdef IMAGE_COPY
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/* Copy decompressor code to the right place */
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li t2, LOADADDR
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add a0, t2, 0
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la a1, code_start
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la a2, code_stop
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$L1:
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lw t0, 0(a1)
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sw t0, 0(a0)
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add a1, 4
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add a0, 4
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blt a1, a2, $L1
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nop
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#endif
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/* At this point we need to invalidate dcache and */
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/* icache before jumping to new code */
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@ -128,7 +148,11 @@ noic:
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move a0,s3 /* icache line size */
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move a1,s4 /* icache size */
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move a2,s1 /* dcache line size */
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#ifdef IMAGE_COPY
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jal t2
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#else
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jal entry
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#endif
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move a3,s2 /* dcache size */
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.set reorder
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