qemu/tests/tcg/x86_64/cmpxchg.c

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#include <assert.h>
static int mem;
static unsigned long test_cmpxchgb(unsigned long orig)
{
unsigned long ret;
mem = orig;
asm("cmpxchgb %b[cmp],%[mem]"
: [ mem ] "+m"(mem), [ rax ] "=a"(ret)
: [ cmp ] "r"(0x77), "a"(orig));
return ret;
}
static unsigned long test_cmpxchgw(unsigned long orig)
{
unsigned long ret;
mem = orig;
asm("cmpxchgw %w[cmp],%[mem]"
: [ mem ] "+m"(mem), [ rax ] "=a"(ret)
: [ cmp ] "r"(0x7777), "a"(orig));
return ret;
}
static unsigned long test_cmpxchgl(unsigned long orig)
{
unsigned long ret;
mem = orig;
asm("cmpxchgl %[cmp],%[mem]"
: [ mem ] "+m"(mem), [ rax ] "=a"(ret)
: [ cmp ] "r"(0x77777777u), "a"(orig));
return ret;
}
int main()
{
unsigned long test = 0xdeadbeef12345678ull;
assert(test == test_cmpxchgb(test));
assert(test == test_cmpxchgw(test));
assert(test == test_cmpxchgl(test));
return 0;
}