| #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 ) {} |
| } |
