iPXE
nulltrap.c
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1#include <stdint.h>
2#include <stdio.h>
3
4__attribute__ (( noreturn, section ( ".text.null_trap" ) ))
5void null_function_trap ( void ) {
6 void *stack;
7
8 /* 128 bytes of NOPs; the idea of this is that if something
9 * dereferences a NULL pointer and overwrites us, we at least
10 * have some chance of still getting to execute the printf()
11 * statement.
12 */
13 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
14 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
15 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
16 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
17 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
18 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
19 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
20 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
21 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
22 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
23 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
24 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
25 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
26 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
27 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
28 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
29 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
30 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
31 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
32 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
33 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
34 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
35 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
36 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
37 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
38 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
39 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
40 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
41 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
42 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
43 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
44 __asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
45
46 __asm__ __volatile__ ( "movl %%esp, %0" : "=r" ( stack ) );
47 printf ( "NULL method called from %p (stack %p)\n",
48 __builtin_return_address ( 0 ), stack );
49 DBG_HD ( stack, 256 );
50 while ( 1 ) {}
51}
__volatile__
__asm__ __volatile__("call *%9" :"=a"(result), "=c"(discard_ecx), "=d"(discard_edx) :"d"(0), "a"(code), "b"(0), "c"(in_phys), "D"(0), "S"(out_phys), "m"(hypercall))
DBG_HD
#define DBG_HD(...)
Definition compiler.h:500
__attribute__
#define __attribute__(x)
Definition compiler.h:10
section
struct netvsc_rx_buffer_section section[1]
Section descriptors.
Definition netvsc.h:7
__asm__
__asm__(".section \".rodata\", \"a\", " PROGBITS "\n\t" "\nprivate_key_data:\n\t" ".size private_key_data, ( . - private_key_data )\n\t" ".equ private_key_len, ( . - private_key_data )\n\t" ".previous\n\t")
printf
int printf(const char *fmt,...)
Write a formatted string to the console.
Definition vsprintf.c:465
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