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9e005b761e
The next commit will make the way of passing CONFIG options more robust.
Unfortunately, it would uncover another hidden issue; without this
commit, skiroot_defconfig would be broken like this:
| WRAP arch/powerpc/boot/zImage.pseries
| arch/powerpc/boot/wrapper.a(decompress.o): In function `bcj_powerpc.isra.10':
| decompress.c:(.text+0x720): undefined reference to `get_unaligned_be32'
| decompress.c:(.text+0x7a8): undefined reference to `put_unaligned_be32'
| make[1]: *** [arch/powerpc/boot/Makefile;383: arch/powerpc/boot/zImage.pseries] Error 1
| make: *** [arch/powerpc/Makefile;295: zImage] Error 2
skiroot_defconfig is the only defconfig that enables CONFIG_KERNEL_XZ
for ppc, which has never been correctly built before.
I figured out the root cause in lib/decompress_unxz.c:
| #ifdef CONFIG_PPC
| # define XZ_DEC_POWERPC
| #endif
CONFIG_PPC is undefined here in the ppc bootwrapper because autoconf.h
is not included except by arch/powerpc/boot/serial.c
XZ_DEC_POWERPC is not defined, therefore, bcj_powerpc() is not compiled
for the bootwrapper.
With the next commit passing CONFIG_PPC correctly, we would realize that
{get,put}_unaligned_be32 was missing.
Unlike the other decompressors, the ppc bootwrapper duplicates all the
necessary helpers in arch/powerpc/boot/.
The other architectures define __KERNEL__ and pull in helpers for
building the decompressors.
If ppc bootwrapper had defined __KERNEL__, lib/xz/xz_private.h would
have included <asm/unaligned.h>:
| #ifdef __KERNEL__
| # include <linux/xz.h>
| # include <linux/kernel.h>
| # include <asm/unaligned.h>
However, doing so would cause tons of definition conflicts since the
bootwrapper has duplicated everything.
I just added copies of {get,put}_unaligned_be32, following the
bootwrapper coding convention.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190705100144.28785-1-yamada.masahiro@socionext.com
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|---|---|---|
| .. | ||
| dts | ||
| .gitignore | ||
| 4xx.c | ||
| 4xx.h | ||
| 44x.h | ||
| addnote.c | ||
| bamboo.c | ||
| cpm-serial.c | ||
| crt0.S | ||
| crtsavres.S | ||
| cuboot-8xx.c | ||
| cuboot-52xx.c | ||
| cuboot-83xx.c | ||
| cuboot-85xx-cpm2.c | ||
| cuboot-85xx.c | ||
| cuboot-824x.c | ||
| cuboot-acadia.c | ||
| cuboot-amigaone.c | ||
| cuboot-bamboo.c | ||
| cuboot-ebony.c | ||
| cuboot-hotfoot.c | ||
| cuboot-katmai.c | ||
| cuboot-kilauea.c | ||
| cuboot-mpc7448hpc2.c | ||
| cuboot-pq2.c | ||
| cuboot-rainier.c | ||
| cuboot-sam440ep.c | ||
| cuboot-sequoia.c | ||
| cuboot-taishan.c | ||
| cuboot-warp.c | ||
| cuboot-yosemite.c | ||
| cuboot.c | ||
| cuboot.h | ||
| dcr.h | ||
| decompress.c | ||
| devtree.c | ||
| div64.S | ||
| dummy.c | ||
| ebony.c | ||
| elf_util.c | ||
| elf.h | ||
| ep88xc.c | ||
| ep405.c | ||
| ep8248e.c | ||
| epapr-wrapper.c | ||
| epapr.c | ||
| fixed-head.S | ||
| fixup-headers.sed | ||
| fsl-soc.c | ||
| fsl-soc.h | ||
| gamecube-head.S | ||
| gamecube.c | ||
| hack-coff.c | ||
| holly.c | ||
| install.sh | ||
| io.h | ||
| libfdt_env.h | ||
| libfdt-wrapper.c | ||
| main.c | ||
| Makefile | ||
| mktree.c | ||
| motload-head.S | ||
| mpc8xx.c | ||
| mpc8xx.h | ||
| mpc52xx-psc.c | ||
| mvme5100.c | ||
| mvme7100.c | ||
| ns16550.c | ||
| of.c | ||
| of.h | ||
| ofconsole.c | ||
| oflib.c | ||
| opal-calls.S | ||
| opal.c | ||
| ops.h | ||
| page.h | ||
| planetcore.c | ||
| planetcore.h | ||
| ppc_asm.h | ||
| ppcboot-hotfoot.h | ||
| ppcboot.h | ||
| pq2.c | ||
| pq2.h | ||
| ps3-head.S | ||
| ps3-hvcall.S | ||
| ps3.c | ||
| pseries-head.S | ||
| README | ||
| redboot-8xx.c | ||
| redboot-83xx.c | ||
| redboot.h | ||
| reg.h | ||
| rs6000.h | ||
| serial.c | ||
| simple_alloc.c | ||
| simpleboot.c | ||
| stdbool.h | ||
| stdint.h | ||
| stdio.c | ||
| stdio.h | ||
| stdlib.c | ||
| stdlib.h | ||
| string.h | ||
| string.S | ||
| swab.h | ||
| treeboot-akebono.c | ||
| treeboot-bamboo.c | ||
| treeboot-currituck.c | ||
| treeboot-ebony.c | ||
| treeboot-iss4xx.c | ||
| treeboot-walnut.c | ||
| types.h | ||
| uartlite.c | ||
| ugecon.c | ||
| ugecon.h | ||
| util.S | ||
| virtex405-head.S | ||
| virtex.c | ||
| wii-head.S | ||
| wii.c | ||
| wrapper | ||
| xz_config.h | ||
| zImage.coff.lds.S | ||
| zImage.lds.S | ||
| zImage.ps3.lds.S | ||
To extract the kernel vmlinux, System.map, .config or initrd from the zImage binary: objcopy -j .kernel:vmlinux -O binary zImage vmlinux.gz objcopy -j .kernel:System.map -O binary zImage System.map.gz objcopy -j .kernel:.config -O binary zImage config.gz objcopy -j .kernel:initrd -O binary zImage.initrd initrd.gz Peter