linux/arch/s390
Vasily Gorbik 369f91c374 s390/decompressor: rework uncompressed image info collection
The kernel decompressor has to know several bits of information about
uncompressed image. Currently this info is collected by running "nm" on
uncompressed vmlinux + "sed" and producing sizes.h file. This method
worked well, but it has several disadvantages. Obscure symbols name
pattern matching is fragile. Adding new values makes pattern even
longer. Logic is spread across code and make file. Limited ability to
adjust symbols values (currently magic lma value of 0x100000 is always
subtracted). Apart from that same pieces of information (and more)
would be needed for early memory detection and features like KASLR
outside of boot/compressed/ folder where sizes.h is generated.

To overcome limitations new "struct vmlinux_info" has been introduced
to include values needed for the decompressor and the rest of the
boot code. The only static instance of vmlinux_info is produced during
vmlinux link step by filling in struct fields by the linker (like it is
done with input_data in boot/compressed/vmlinux.scr.lds.S). This way
individual values could be adjusted with all the knowledge linker has
and arithmetic it supports. Later .vmlinux.info section (which contains
struct vmlinux_info) is transplanted into the decompressor image and
dropped from uncompressed image altogether.

While doing that replace "compressed/vmlinux.scr.lds.S" linker
script (whose purpose is to rename .data section in piggy.o to
.rodata.compressed) with plain objcopy command. And simplify
decompressor's linker script.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-10-09 11:21:02 +02:00
..
appldata s390/appldata: do not use stack buffers for hardware data 2018-10-09 11:20:52 +02:00
boot s390/decompressor: rework uncompressed image info collection 2018-10-09 11:21:02 +02:00
configs s390: update defconfigs 2018-04-27 06:51:31 +02:00
crypto s390/crypto: Fix return code checking in cbc_paes_crypt() 2018-09-04 10:58:17 +02:00
hypfs s390/hypfs: do not use stack buffers for hardware data 2018-10-09 11:20:53 +02:00
include s390: unify stack size definitions 2018-10-09 11:20:58 +02:00
kernel s390/decompressor: rework uncompressed image info collection 2018-10-09 11:21:02 +02:00
kvm KVM: s390: Properly lock mm context allow_gmap_hpage_1m setting 2018-09-04 11:40:26 +02:00
lib s390/lib: use expoline for all bcr instructions 2018-08-07 13:38:13 +02:00
mm s390: add support for virtually mapped kernel stacks 2018-10-09 11:20:57 +02:00
net Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2018-08-13 19:07:17 -07:00
numa s390/numa: move initial setup of node_to_cpumask_map 2018-08-01 07:48:33 +02:00
oprofile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci s390/pci: remove fmb address from debug output 2018-08-16 14:49:13 +02:00
purgatory s390: clean up stacks setup 2018-09-20 13:20:29 +02:00
scripts s390/build: add *.o.chkbss files to targets list 2018-07-02 12:32:23 +02:00
tools Minor code cleanups for PPC. 2018-08-19 10:38:36 -07:00
defconfig s390/zcrypt: multiple zcrypt device nodes support 2018-10-08 09:09:58 +02:00
Kbuild s390/kexec_file: Add purgatory 2018-04-16 09:10:22 +02:00
Kconfig s390: add support for virtually mapped kernel stacks 2018-10-09 11:20:57 +02:00
Kconfig.debug Kconfig: consolidate the "Kernel hacking" menu 2018-08-02 08:06:48 +09:00
Makefile kbuild: rename LDFLAGS to KBUILD_LDFLAGS 2018-08-24 08:22:08 +09:00