Messages in this thread | | | Date | Fri, 13 Aug 2004 20:02:39 +0200 | From | Sam Ravnborg <> | Subject | Re: [PATCH]: __crc_* symbols in System.map |
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On Thu, Aug 12, 2004 at 12:05:58AM -0700, David S. Miller wrote: > On Thu, 12 Aug 2004 07:01:36 +0200 > Sam Ravnborg <sam@ravnborg.org> wrote: > > > Would it be an option to skip all 'A' symbols? > > I doubt it. Symbols defined via the linker script will > end up as " A ". On sparc64 this happens for swapper_pmd_dir, > empty_pg_dir, _etext, _edata, and _end for example. Did a: nm vmlinux | grep ' A ' | grep -v '__crc_' | wc -l 32
So yep.
Modified your patch to match my tree - patched soon to appear at lkml.
Sam
In my tree I now have a script to generate System.map - that now looks like this:
#!/bin/sh -x # Based on the vmlinux file create the System.map file # System.map is used by module-init tools and some debugging # tools to retreive the actual addresses of symbols in the kernel. # # Before creating the System.map file as a sideeffect check for # undefined symbols. # At least one version of the ARM bin-utils did not error out on # undefined symbols, so catch them here instead.
# Usage # mksysmap vmlinux System.map
##### # Check for undefined symbols. # Undefined symbols with three leading underscores are ignored since # they are used by the sparc BTFIXUP logic - and is assumed to be undefined.
if [ "`$NM -u $1 | grep -v ' ___'`" != "" ]; then echo "$1: error: undefined symbol(s) found:" $NM -u $1 | grep -v ' ___' exit 1 fi
##### # Generate System.map (actual filename passed as second argument)
# $NM produces the following output: # f0081e80 T alloc_vfsmnt
# The second row specify the type of the symbol: # A = Absolute # B = Uninitialised data (.bss) # C = Comon symbol # D = Initialised data # G = Initialised data for small objects # I = Indirect reference to another symbol # N = Debugging symbol # R = Read only # S = Uninitialised data for small objects # T = Text code symbol # U = Undefined symbol # V = Weak symbol # W = Weak symbol # Corresponding small letters are local symbols
# For System.map filter away: # a - local absolute symbols # U - undefined global symbols # w - local weak symbols
# readprofile starts reading symbols when _stext is found, and # continue until it finds a symbol which is not either of 'T', 't', # 'W' or 'w'. __crc_ are 'A' and placed in the middle # so we just ignore them to let readprofile continue to work. # (At least sparc64 has __crc_ in the middle).
$NM -n $1 | grep '\( [aUw] \)\|\(__crc_\)' > $2
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