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 <egorenar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
sizes.h and vmlinux.scr.lds are not generated since commit 369f91c374
("s390/decompressor: rework uncompressed image info collection").
vmlinux.bin.full is not generated since commit 183ab05ff2 ("s390: get
rid of the first mb of uncompressed image").
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Rename vmlinux.scr to vmlinux.scr.lds.S and add it to build rules to
enable preprocessor for it.
Also add vmlinux.scr.lds to local .gitignore
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Commit 81796a3c6a ("s390/decompressor: trim uncompressed
image head during the build") introduced a new
file named vmlinux.bin.full in directory
arch/s390/boot/compressed.
Add this file to the list of ignored files so it does
not show up on git status.
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Vasily Gorbik