Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / arch / i386 / core / nulltrap.c

diff --git a/qemu/roms/ipxe/src/arch/i386/core/nulltrap.c b/qemu/roms/ipxe/src/arch/i386/core/nulltrap.c
new file mode 100644 (file)
index 0000000..3046fbe
--- /dev/null
+++ b/qemu/roms/ipxe/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 ) {}
+}