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1extern void _start (void);
2
3/* Lives in libgcc.so and canonicalizes function pointers for comparison. */
4extern unsigned int __canonicalize_funcptr_for_compare (unsigned int fptr);
5
6/* The function's entry point is stored in the first word of the
7 function descriptor (plabel) of _start(). */
8#define ENTRY_POINT __canonicalize_funcptr_for_compare((unsigned int)_start)
9

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source code of glibc/sysdeps/hppa/entry.h