BMC/Intel-BMC/linux.git/arch/s390/boot/compressed, branch dev-5.2

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

2019-05-07T12:37:14+00:00

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

2019-04-29T08:47:10+00:00

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

s390/kernel: build a relocatable kernel

2019-04-29T08:47:10+00:00

This patch adds support for building a relocatable kernel with -fPIE. The kernel will be relocated to 0 early in the boot process. Signed-off-by: Gerald Schaefer Reviewed-by: Philipp Rudo Signed-off-by: Martin Schwidefsky

s390: introduce .boot.preserved.data section

2019-04-10T15:47:09+00:00

Introduce .boot.preserve.data section which is similar to .boot.data and "shared" between the decompressor code and the decompressed kernel. The decompressor will store values in it, and copy over to the decompressed image before starting it. This method allows to avoid using pre-defined addresses and other hacks to pass values between those boot phases. Unlike .boot.data section .boot.preserved.data is NOT a part of init data, and hence will be preserved for the kernel life time. Signed-off-by: Gerald Schaefer Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390: make built-in.a not directly depend on *.o.chkbss files

2019-01-28T00:11:17+00:00

When I was refactoring cmd_ar_builtin in scripts/Makefile.build, I noticed the build breakage of s390. Some Makefiles of s390 add extra dependencies to built-in.a; built-in.a depends on timestamp files *.o.chkbss, but $(AR) does not want to include them into built-in.a. Insert a phony target 'chkbss' in between so that $(AR) can take $(filter-out $(PHONY), $^) as input. While I was here, I refactored Makefile.chkbss a little bit. Signed-off-by: Masahiro Yamada Acked-by: Heiko Carstens

s390: avoid vmlinux segments overlap

2018-10-26T08:19:40+00:00

Currently .vmlinux.info section of uncompressed vmlinux elf image is included into the data segment and load address specified as 0. That extends data segment to address 0 and makes "text" and "data" segments overlap. Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flags Align LOAD 0x0000000000001000 0x0000000000100000 0x0000000000100000 0x0000000000ead03c 0x0000000000ead03c R E 0x1000 LOAD 0x0000000000eaf000 0x0000000000000000 0x0000000000000000 0x0000000001a13400 0x000000000233b520 RWE 0x1000 NOTE 0x0000000000eae000 0x0000000000fad000 0x0000000000fad000 0x000000000000003c 0x000000000000003c 0x4 Section to Segment mapping: Segment Sections... 00 .text .notes 01 .rodata __ksymtab __ksymtab_gpl __ksymtab_strings __param __modver .data..ro_after_init __ex_table .data __bug_table .init.text .exit.text .exit.data .altinstructions .altinstr_replacement .nospec_call_table .nospec_return_table .boot.data .init.data .data..percpu .bss .vmlinux.info 02 .notes Later when vmlinux.bin is produced from vmlinux, .vmlinux.info section is removed. But elf vmlinux file, even though it is not bootable anymore, used for debugging and loadable segments overlap should be avoided. Utilize special ":NONE" phdr specification to avoid adding .vmlinux.info into loadable data segment. Also set .vmlinux.info section type to INFO, which allows to get a not-loadable info CONTENTS section. Since minimal supported version of binutils 2.20 does not have --dump-section objcopy option, make .vmlinux.info section loadable during info.bin creation to get actual section contents. Reported-by: Philipp Rudo Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390/decompressor: add missing FORCE to build targets

2018-10-26T08:19:40+00:00

According to Documentation/kbuild/makefiles.txt all build targets using if_changed should use FORCE as well. Add missing FORCE to make sure vmlinux decompressor targets are rebuild properly when not just immediate prerequisites have changed but also when build command differs. Reviewed-by: Philipp Rudo Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390/kasan: avoid instrumentation of early C code

2018-10-09T09:21:17+00:00

Instrumented C code cannot run without the kasan shadow area. Exempt source code files from kasan which are running before / used during kasan initialization. Reviewed-by: Martin Schwidefsky Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390: introduce .boot.data section

2018-10-09T09:21:06+00:00

Introduce .boot.data section which is "shared" between the decompressor code and the decompressed kernel. The decompressor will store values in it, and copy over to the decompressed image before starting it. This method allows to avoid using pre-defined addresses and other hacks to pass values between those boot phases. .boot.data section is a part of init data, and will be freed after kernel initialization is complete. For uncompressed kernel image, .boot.data section is basically the same as .init.data Reviewed-by: Martin Schwidefsky Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390/decompressor: clean up and rename compressed/misc.c

2018-10-09T09:21:05+00:00

Since compressed/misc.c is conditionally compiled move error reporting code to boot/main.c. With that being done compressed/misc.c has no "miscellaneous" functions left and is all about plain decompression now. Rename it accordingly. Reviewed-by: Martin Schwidefsky Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky