| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | #!/bin/sh -x |
| 2 | # Based on the vmlinux file create the System.map file |
| 3 | # System.map is used by module-init tools and some debugging |
| 4 | # tools to retrieve the actual addresses of symbols in the kernel. |
| 5 | # |
| 6 | # Usage |
| 7 | # mksysmap vmlinux System.map |
| 8 | |
| 9 | |
| 10 | ##### |
| 11 | # Generate System.map (actual filename passed as second argument) |
| 12 | |
| 13 | # $NM produces the following output: |
| 14 | # f0081e80 T alloc_vfsmnt |
| 15 | |
| 16 | # The second row specify the type of the symbol: |
| 17 | # A = Absolute |
| 18 | # B = Uninitialised data (.bss) |
| 19 | # C = Common symbol |
| 20 | # D = Initialised data |
| 21 | # G = Initialised data for small objects |
| 22 | # I = Indirect reference to another symbol |
| 23 | # N = Debugging symbol |
| 24 | # R = Read only |
| 25 | # S = Uninitialised data for small objects |
| 26 | # T = Text code symbol |
| 27 | # U = Undefined symbol |
| 28 | # V = Weak symbol |
| 29 | # W = Weak symbol |
| 30 | # Corresponding small letters are local symbols |
| 31 | |
| 32 | # For System.map filter away: |
| 33 | # a - local absolute symbols |
| 34 | # U - undefined global symbols |
| 35 | # N - debugging symbols |
| 36 | # w - local weak symbols |
| 37 | |
| 38 | # readprofile starts reading symbols when _stext is found, and |
| 39 | # continue until it finds a symbol which is not either of 'T', 't', |
| 40 | # 'W' or 'w'. __crc_ are 'A' and placed in the middle |
| 41 | # so we just ignore them to let readprofile continue to work. |
| 42 | # (At least sparc64 has __crc_ in the middle). |
| 43 | |
| 44 | $NM -n $1 | grep -v '\( [aNUw] \)\|\(__crc_\)\|\( \$[adt]\)\|\( .L\)' > $2 |