1 files changed, 43 insertions, 0 deletions
diff --git a/funcjmp_simple_x86.c b/funcjmp_simple_x86.c
new file mode 100644
index 0000000..5291788
--- /dev/null
+++ b/funcjmp_simple_x86.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef __i386
+#error "Unsupported Architecture"
+#endif
+
+#define INTEL_ASM(_asm_str) asm volatile(".intel_syntax noprefix"); \
+	asm volatile(_asm_str); \
+	asm volatile(".att_syntax prefix");
+#define JUMPABLE_FUNC(fname) int fname(void)
+#define JMP_FUNC_DECL(func) void *fptr = (void *)( &func );
+#define JMP_TO_FUNC \
+	INTEL_ASM(" \
+	        call getip; \
+	        jmp short donext; \
+	        cfunc: \
+	                mov eax,[fptr]; \
+	                add eax,0x0; \
+	                jmp eax; \
+	                ret; \
+	        getip: \
+	                nop; \
+	                jmp short cfunc; \
+	        donext: \
+	");
+
+JUMPABLE_FUNC(testfkt);
+JMP_FUNC_DECL(testfkt);
+
+JUMPABLE_FUNC(testfkt)
+{
+  int var0 = 0x1, var1 = 0x2, var2 = 0x3;
+  var0 += var1 + var2;
+  printf("Subroutine: %d = %d + %d\n", var0, var1, var2);
+  return 0;
+}
+
+int main(int argc, char **argv)
+{
+  JMP_TO_FUNC;
+  return 66;
+}