kernel.git/arch/s390/boot/compressed, branch linux-5.13.y

s390/boot: add build-id to decompressor

2020-12-09T20:02:07Z

More and more functionality from the early boot phase gets carried over to the decompressor. With this the complexity of the code and thus the chance to introduce bugs increases. In order to be able to debug these early boot bugs the distributions have to package the decompressors vmlinux together with the other debuginfos. However for that the distributions require the vmlinux to contain a build-id. Per default the section containing the build-id is placed first in the section table. So make sure to move it behind the .text section otherwise the image would be unbootable. Signed-off-by: Philipp Rudo Signed-off-by: Heiko Carstens

s390/decompressor: add symbols support

2020-11-20T18:19:11Z

Information printed by print_pgm_check_info() is crucial for debugging decompressor problems. Printing instruction addresses is better than nothing, but turns further debugging into tedious job of figuring out which function those addresses correspond to. This change adds simplistic symbols resolution support. And adds %pS format specifier support to decompressor_printk(). Decompressor symbols list is extracted and sorted with nm -n -S: ... 0000000000010000 0000000000000014 T startup 0000000000010014 00000000000000b0 t startup_normal 0000000000010180 00000000000000b2 t startup_kdump ... Then functions are filtered and contracted to a form: "10000 14 startup\0""10014 b0 startup_normal\0""10180 b2 startup_kdump\0" ... Which makes it trivial to find beginning of an entry and names are 0 terminated, so could be used as is. Symbols are binary-searched. To get symbols list with final addresses and then get it into the decompressor's image the same trick as for kallsyms is used. Decompressor's vmlinux is linked twice. Symbols are stored in .decompressor.syms section, current size is about 2kb. Reviewed-by: Alexander Egorenkov Signed-off-by: Vasily Gorbik Signed-off-by: Heiko Carstens

s390/decompressor: fix build warning

2020-11-09T10:20:59Z

Fixes the following warning with CONFIG_KERNEL_UNCOMPRESSED=y arch/s390/boot/compressed/decompressor.h:6:46: warning: non-void function does not return a value [-Wreturn-type] static inline void *decompress_kernel(void) {} ^ Signed-off-by: Vasily Gorbik Signed-off-by: Heiko Carstens

s390/boot: enable .bss section for compressed kernel

2020-09-16T12:08:47Z

- Support static uninitialized variables in compressed kernel. - Remove chkbss script - Get rid of workarounds for not having .bss section Signed-off-by: Alexander Egorenkov Reviewed-by: Vasily Gorbik Signed-off-by: Vasily Gorbik

.gitignore: add SPDX License Identifier

2020-03-25T10:50:48Z

Add SPDX License Identifier to all .gitignore files. Signed-off-by: Masahiro Yamada Signed-off-by: Greg Kroah-Hartman

s390/boot: rename HEAP_SIZE due to name collision

2020-01-31T18:30:40Z

Change the conflicting macro name in preparation for zlib_inflate hardware support. Link: http://lkml.kernel.org/r/20200103223334.20669-3-zaslonko@linux.ibm.com Signed-off-by: Mikhail Zaslonko Reviewed-by: Christian Borntraeger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

s390/startup: adjust _sdma and _edma to page boundaries

2019-08-21T10:58:53Z

Move .dma.text section alignment out of section description, otherwise zeros used to align the section are included in the section itself (and section is not really aligned by itself). $ objdump -h arch/s390/boot/compressed/vmlinux 5 .dma.text 00001e38 000000000001b1c8 000000000001b1c8 0001c1c8 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 6 .dma.ex_table 00000018 000000000001d000 000000000001d000 0001e000 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 7 .dma.data 00000240 000000000001d080 000000000001d080 0001e080 2**7 CONTENTS, ALLOC, LOAD, DATA $ cat /sys/kernel/debug/memblock/reserved 0: 0x0000000000000000..0x0000000000011fff 1: 0x000000000001b1c8..0x000000000001d2bf ... Also add alignment before _edma linker symbol definition, so that entire .dma* region is rounded up to page boundaries. $ objdump -h arch/s390/boot/compressed/vmlinux 5 .dma.text 00001000 000000000001c000 000000000001c000 0001d000 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 6 .dma.ex_table 00000018 000000000001d000 000000000001d000 0001e000 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 7 .dma.data 00000240 000000000001d080 000000000001d080 0001e080 2**7 CONTENTS, ALLOC, LOAD, DATA $ cat /sys/kernel/debug/memblock/reserved 0: 0x0000000000000000..0x0000000000011fff 1: 0x000000000001c000..0x000000000001dfff ... $ cat /sys/kernel/debug/kernel_page_tables ---[ Identity Mapping ]--- 0x0000000000000000-0x000000000001c000 112K PTE RW NX 0x000000000001c000-0x000000000001d000 4K PTE RO X 0x000000000001d000-0x0000000000100000 908K PTE RW NX ... Reviewed-by: Gerald Schaefer Signed-off-by: Vasily Gorbik

s390/startup: purge obsolete .gitignore patterns

2019-08-21T10:41:43Z

sizes.h and vmlinux.scr.lds are not generated since commit 369f91c37451 ("s390/decompressor: rework uncompressed image info collection"). vmlinux.bin.full is not generated since commit 183ab05ff285 ("s390: get rid of the first mb of uncompressed image"). Signed-off-by: Vasily Gorbik

s390/boot: fix compiler error due to missing awk strtonum

2019-05-07T12:37:14Z

The strtonum awk function is a GNU extension and is not available with all versions of awk. The link of bzImage fails with this error message: >> awk: line 2: function or never defined >> awk: line 2: function strtonum never defined objcopy: --pad-to: bad number: arch/s390/boot/compressed/vmlinux Drop the awk script and the --pad-to objcopy parameter it generated and use a FILL pattern with an appropriate alignment in the linker script for the arch/s390/boot/compressed/vmlinux file. Fixes: f6780686525c ("s390/boot: pad bzImage to 4K") Reported-by: kbuild test robot Suggested-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390/kernel: introduce .dma sections

2019-04-29T08:47:10Z

With a relocatable kernel that could reside at any place in memory, code and data that has to stay below 2 GB needs special handling. This patch introduces .dma sections for such text, data and ex_table. The sections will be part of the decompressor kernel, so they will not be relocated and stay below 2 GB. Their location is passed over to the decompressed / relocated kernel via the .boot.preserved.data section. The duald and aste for control register setup also need to stay below 2 GB, so move the setup code from arch/s390/kernel/head64.S to arch/s390/boot/head.S. The duct and linkage_stack could reside above 2 GB, but their content has to be preserved for the decompresed kernel, so they are also moved into the .dma section. The start and end address of the .dma sections is added to vmcoreinfo, for crash support, to help debugging in case the kernel crashed there. Signed-off-by: Gerald Schaefer Reviewed-by: Philipp Rudo Signed-off-by: Martin Schwidefsky