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#include <xbyak/xbyak.h>
struct Code1 : Xbyak::CodeGenerator {
Code1()
: Xbyak::CodeGenerator(4096, Xbyak::DontSetProtectRWE)
{
mov(eax, 123);
ret();
}
void update()
{
db(0);
}
};
void test1(bool updateCode)
{
Code1 c;
c.setProtectModeRE();
if (updateCode) c.update(); // segmentation fault
int (*f)() = c.getCode<int (*)()>();
printf("f=%d\n", f());
c.setProtectModeRW();
c.update();
puts("ok");
}
struct Code2 : Xbyak::CodeGenerator {
Code2()
: Xbyak::CodeGenerator(4096, Xbyak::AutoGrow)
{
mov(eax, 123);
ret();
}
void update()
{
db(0);
}
};
void test2(bool updateCode)
{
Code2 c;
c.readyRE();
if (updateCode) c.update(); // segmentation fault
int (*f)() = c.getCode<int (*)()>();
printf("f=%d\n", f());
c.setProtectModeRW();
c.update();
puts("ok");
}
int main(int argc, char *argv[])
{
if (argc < 2) {
fprintf(stderr, "%s <testNum> [update]\n", argv[0]);
return 0;
}
bool update = argc == 3;
int n = atoi(argv[1]);
printf("n=%d update=%d\n", n, update);
switch (n) {
case 1: test1(update); break;
case 2: test2(update); break;
default: fprintf(stderr, "no test %d\n", n); break;
}
}
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