Source file: /~heha/hs/switch_mode.zip/Linux/switch_mode.cpp

#include <stdlib.h>
#include <cstdio>

extern "C" bool switch_cs(int cs, bool (*f)());
extern "C" bool check_mode();

int main(int argc, char **argv) {
 int cs = 0x23;
 if (argc > 1) cs = strtoull(argv[1], 0, 16);
 printf("switch to CS=%02x\n", cs);
 bool r = switch_cs(cs, check_mode);
 if (r) printf("cs=%02x: 64-bit mode\n", cs);
 else   printf("cs=%02x: 32-bit mode\n", cs);
}