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#include <stdint.h>
#include <stdio.h>
__attribute__ (( noreturn, section ( ".text.null_trap" ) ))
void null_function_trap ( void ) {
void *stack;
/* 128 bytes of NOPs; the idea of this is that if something
* dereferences a NULL pointer and overwrites us, we at least
* have some chance of still getting to execute the printf()
* statement.
*/
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "movl %%esp, %0" : "=r" ( stack ) );
printf ( "NULL method called from %p (stack %p)\n",
__builtin_return_address ( 0 ), stack );
DBG_HD ( stack, 256 );
while ( 1 ) {}
}
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