File: entry.h

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glibc 2.23-4
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#ifndef __ASSEMBLY__
extern void _start (void);
#endif

/* 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)

/* We have to provide a special declaration.  */
#define ENTRY_POINT_DECL(class) class void _start (void);