glibc/sysdeps/hppa/entry.h

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