Linker -Map option allows to save detailed link map which provides far
more information then the objdump tool might extract.
Discarded input sections
.text.__s390_indirect_jump_r14
0x0000000000000000 0xc arch/s390/kernel/process.o
Detailed information on sections, objects and symbols.
.init.data 0x0000000001276000 0x671f0
*(SORT_BY_NAME(___kentry+*))
*(.init.data init.data.*)
.init.data 0x0000000001276000 0x31b8 init/main.o
0x0000000001276128 late_time_init
0x00000000012781b8 boot_command_line
.init.data 0x00000000012791b8 0x60 init/do_mounts.o
.init.data 0x0000000001279218 0x4 init/do_mounts_rd.o
0x0000000001279218 rd_image_start
*fill* 0x000000000127921c 0x4
.init.data 0x0000000001279220 0x18 init/do_mounts_initrd.o
0x0000000001279228 phys_initrd_start
0x0000000001279230 phys_initrd_size
It helps to bring the light on linker decisions and debug linker scripts.
FILL mask 0xff
0x000000000082f000 . = ALIGN (0x1000)
*fill* 0x000000000082e3fa 0xc06 ff
0x000000000082f000 _end = .
Resulting vmlinux.map is currently 8.8M for s390.
And 48K for the decompressor's arch/s390/boot/compressed/vmlinux.map
- First patch introduces CONFIG_SAVE_LINK_MAP option, which enables
link map and is arch independent.
- Second patch is s390 specific and additionally enables decompressor's
link map saving if CONFIG_SAVE_LINK_MAP is enabled.
It is probably better if both changes would go via kbuild tree.
Vasily Gorbik (2):
kbuild: add config option to save link map file(s)
s390/decompressor: support link map saving
.gitignore | 1 +
Makefile | 6 +++++-
arch/s390/boot/compressed/Makefile | 4 +++-
lib/Kconfig.debug | 13 +++++++++++++
4 files changed, 22 insertions(+), 2 deletions(-)
--
2.25.4
