File generation process
NM=nm bash ./scripts/mksysmap vmlinux System.map
file format
The content format of arm-linux system.map is
Link address type symbol
Why is the address a link address?
What are the types?
https://blog.csdn.net/u011011827/article/details/69938645
File usage
When an oops occurs in the kernel, the contents of pc are printed out, which are addresses.
klogd will block kernel oops information and
1. Call syslogd to record it
2. Use System.map file to perform symbol-address resolution and convert addresses to symbols
Some drivers will use System.map to resolve symbols
Other Programs
klogd
lsof
ps
dosemu
File Location
Generated in the top-level directory
Should be placed
/boot/System.map
document content
System.map can be divided into 8 parts
miscellaneous
00000018
...
c0004000 A swapper_pg_dir
...
c0008000 T _text
...
c0008000 T stext
...
c000807c t __create_page_tables
c0008150 t __enable_mmu
c00081d4
contains .text.* sections, may also contain .rodata.* and/or .init.* sections
c0100000 T _stext
...
c0600000 R _etext
contains .rodata.* sections
c0600000 R __start_rodata
...
c06b6000 R __end_rodata
miscellaneous
c06b6648 R __start_unwind_idx
...
c06d43d8 R __stop_unwind_tab
contains .init.* sections, but .init.text.* may be out of this range on some architectures.
c0700000 T __init_begin
...
c0800000 D __init_end
contains .data.* sections, may also contain .rodata.* and/or .init.* sections.
c0800000 D _sdate
...
c088e548 D_edata
...
contains BSS sections
c088e548 B __bss_start
...
c08c413c B __bss_stop
c08c413c B _end
miscellaneous
fffe0000 T __eitcm_text
...
ffff1240 T vector_fiq
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