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New .S file did not get compiled, please help


I am working on ia64 and glibc-2.5. My goal is to do whole program instrumentation to enable taint tracking.

For that purpose, I need a specific memcpy which is built for taint tracking, so I did the following modifications to glibc (actually very trivial modifications):

in string/memcpy.c, I rewrite the memcpy to call shift_memcpy (which is the real memory copy routine) twice, one to write the bitmap for taint tracking, one for the real memory copy. The skeleton of the code is shown below:


void *
memcpy (dstpp, srcpp, len)
    void *dstpp;
    const void *srcpp;
    size_t len;
   shift_memcpy (dst, src, len);    /* write the bitmap */
   shift_memcpy (dst', src', len');  /* real memory copy */


For performance reason, the shift_memcpy is implemented through reusing the memcpy.S (sysdeps/ia64/memcpy.S) to shift-memcpy.S and modify the definition of memcpy to shift_memcpy (That is, change entry(memcpy) to entry(shift_memcpy), and so on). I have also added shift_memcpy to Versions under "sysdeps/ia64".

However, when I get the modified glibc to build, it cannot find shift_memcpy, and I traced the problem, found that shift_memcpy.S did not get compiled... (that is, no shift_memcpy.o, shift_memcpy.os generated).

the full error is shown below:


/home/wuxi/shift/install/compiler-4.1.1/bin/gcc -nostdlib -nostartfiles -shared \
-Wl,-z,combreloc -Wl,-z,defs -Wl,--verbose 2>&1 | \
sed -e '/^=========/,/^=========/!d;/^=========/d' \
-e 's/\. = 0 + SIZEOF_HEADERS;/& _begin = . - SIZEOF_HEADERS;/' \
> /home/wuxi/shift/build/glibc2.5/elf/
/home/wuxi/shift/install/compiler-4.1.1/bin/gcc -nostdlib -nostartfiles -shared -o /home/wuxi/shift/build/glibc2.5/elf/ \
-Wl,-z,combreloc -Wl,-z,defs \
/home/wuxi/shift/build/glibc2.5/elf/librtld.os -Wl,--version-script=/home/wuxi/shift/build/glibc2.5/ \
-Wl, -T /home/wuxi/shift/build/glibc2.5/elf/
/home/wuxi/shift/build/glibc2.5/elf/librtld.os: In function `memcpy':
/home/wuxi/shift/src/glibc2.5/string/memcpy.c:52: undefined reference to `shift_memcpy'
/home/wuxi/shift/src/glibc2.5/string/memcpy.c:59: undefined reference to `shift_memcpy'
collect2: ld returned 1 exit status
make[2]: *** [/home/wuxi/shift/build/glibc2.5/elf/] Error 1
make[2]: Leaving directory `/home/wuxi/shift/src/glibc2.5/elf'
make[1]: *** [elf/subdir_lib] Error 2
make[1]: Leaving directory `/home/wuxi/shift/src/glibc2.5'
make: *** [all] Error 2


So, what did I miss here? Any help is truly appreciated. Thanks

yours sincerely


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