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| author | Sebastian Schmelzer | 2010-10-25 16:53:54 +0200 |
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| committer | Sebastian Schmelzer | 2010-10-25 16:53:54 +0200 |
| commit | 3050a9253437f4a4b5ad4bf3b3efdc3c660a5137 (patch) | |
| tree | 91ac22153e416aac7ca20916b314b5e2ffa871b1 /contrib/syslinux-4.02/gpxe/src/arch/i386/core/nulltrap.c | |
| download | preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.tar.gz preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.tar.xz preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.zip | |
Diffstat (limited to 'contrib/syslinux-4.02/gpxe/src/arch/i386/core/nulltrap.c')
| -rw-r--r-- | contrib/syslinux-4.02/gpxe/src/arch/i386/core/nulltrap.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/core/nulltrap.c b/contrib/syslinux-4.02/gpxe/src/arch/i386/core/nulltrap.c new file mode 100644 index 0000000..3046fbe --- /dev/null +++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/core/nulltrap.c @@ -0,0 +1,51 @@ +#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 ) {} +} |