WSL2-Linux-Kernel

История

Alan Modra 63ecb08533 powerpc/toc: Future proof kernel toc [ Upstream commit `a3ad84da07` ] This patch future-proofs the kernel against linker changes that might put the toc pointer at some location other than .got+0x8000, by replacing __toc_start+0x8000 with .TOC. throughout. If the kernel's idea of the toc pointer doesn't agree with the linker, bad things happen. prom_init.c code relocating its toc is also changed so that a symbolic __prom_init_toc_start toc-pointer relative address is calculated rather than assuming that it is always at toc-pointer - 0x8000. The length calculations loading values from the toc are also avoided. It's a little incestuous to do that with unreloc_toc picking up adjusted values (which is fine in practice, they both adjust by the same amount if all goes well). I've also changed the way .got is aligned in vmlinux.lds and zImage.lds, mostly so that dumping out section info by objdump or readelf plainly shows the alignment is 256. This linker script feature was added 2005-09-27, available in FSF binutils releases from 2.17 onwards. Should be safe to use in the kernel, I think. Finally, put (.got) before the prom_init.o entry which only needs (.toc), so that the GOT header goes in the correct place. I don't believe this makes any difference for the kernel as it would for dynamic objects being loaded by ld.so. That change is just to stop lusers who blindly copy kernel scripts being led astray. Of course, this change needs the prom_init.c changes. Some notes on .toc and .got. .toc is a compiler generated section of addresses. .got is a linker generated section of addresses, generally built when the linker sees R__GOT* relocations. In the case of powerpc64 ld.bfd, there are multiple generated .got sections, one per input object file. So you can somewhat reasonably write in a linker script an input section statement like prom_init.o(.got .toc) to mean "the .got and .toc section for files matching prom_init.o". On other architectures that doesn't make sense, because the linker generally has just one .got section. Even on powerpc64, note well that the GOT entries for prom_init.o may be merged with GOT entries from other objects. That means that if prom_init.o references, say, _end via some GOT relocation, and some other object also references _end via a GOT relocation, the GOT entry for _end may be in the range __prom_init_toc_start to __prom_init_toc_end and if the kernel does something special to GOT/TOC entries in that range then the value of _end as seen by objects other than prom_init.o will be affected. On the other hand the GOT entry for _end may not be in the range __prom_init_toc_start to __prom_init_toc_end. Which way it turns out is deterministic but a detail of linker operation that should not be relied on. A feature of ld.bfd is that input .toc (and .got) sections matching one linker input section statement may be sorted, to put entries used by small-model code first, near the toc base. This is why scripts for powerpc64 normally use (.got .toc) rather than (.got) *(.toc), since the first form allows more freedom to sort. Another feature of ld.bfd is that indirect addressing sequences using the GOT/TOC may be edited by the linker to relative addressing. In many cases relative addressing would be emitted by gcc for -mcmodel=medium if you appropriately decorate variable declarations with non-default visibility. The original patch is here: https://lore.kernel.org/linuxppc-dev/20210310034813.GM6042@bubble.grove.modra.org/ Signed-off-by: Alan Modra <amodra@au1.ibm.com> [aik: removed non-relocatable which is gone in `24d33ac5b8`] [aik: added <=2.24 check] [aik: because of llvm-as, kernel_toc_addr() uses "mr" instead of global register variable] Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211221055904.555763-2-aik@ozlabs.ru Stable-dep-of: 1b1e38002648 ("powerpc: add crtsavres.o to always-y instead of extra-y") Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-01-25 14:52:32 -08:00
..
dts	powerpc: dts: t1040rdb: fix compatible string for Rev A boards	2023-03-17 08:48:54 +01:00
.gitignore	…
4xx.c	…
4xx.h	…
44x.h	…
Makefile	powerpc/boot: Explicitly disable usage of SPE instructions	2022-10-26 12:34:25 +02:00
README	…
addnote.c	…
bamboo.c	…
cpm-serial.c	…
crt0.S	powerpc/toc: Future proof kernel toc	2024-01-25 14:52:32 -08:00
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	powerpc/boot: Fix a typo in partial_decompress() comment	2021-05-17 15:27:16 +10:00
devtree.c	powerpc/boot: Fixup device-tree on little endian	2021-06-21 21:16:32 +10:00
div64.S	…
dummy.c	…
ebony.c	…
elf.h	…
elf_util.c	…
ep88xc.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	powerpc: make the install target not depend on any build artifact	2021-08-04 10:53:38 +10:00
io.h	…
libfdt-wrapper.c	…
libfdt_env.h	…
main.c	…
microwatt.c	powerpc/boot: Add a boot wrapper for Microwatt	2021-06-21 21:16:32 +10:00
mktree.c	…
motload-head.S	…
mpc8xx.c	…
mpc8xx.h	…
mpc52xx-psc.c	…
mvme5100.c	…
mvme7100.c	…
ns16550.c	powerpc/boot: Fixup device-tree on little endian	2021-06-21 21:16:32 +10:00
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	…
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.S	…
string.h	…
swab.h	…
treeboot-akebono.c	…
treeboot-bamboo.c	…
treeboot-currituck.c	…
treeboot-ebony.c	…
treeboot-iss4xx.c	…
types.h	…
ugecon.c	…
ugecon.h	…
util.S	…
wii-head.S	…
wii.c	…
wrapper	powerpc: retire sbc8548 board support	2021-08-27 00:48:11 +10:00
xz_config.h	…
zImage.coff.lds.S	…
zImage.lds.S	powerpc/toc: Future proof kernel toc	2024-01-25 14:52:32 -08:00
zImage.ps3.lds.S	powerpc/ps3: Re-align DTB in image	2021-06-10 21:44:57 +10:00

README

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