diff options
Diffstat (limited to 'target-i386/int_helper.c')
| -rw-r--r-- | target-i386/int_helper.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/target-i386/int_helper.c b/target-i386/int_helper.c index 9d0d21e786..cf5bbb0481 100644 --- a/target-i386/int_helper.c +++ b/target-i386/int_helper.c @@ -470,3 +470,13 @@ target_ulong helper_pext(target_ulong src, target_ulong mask) #include "shift_helper_template.h" #undef SHIFT #endif + +/* Test that BIT is enabled in CR4. If not, raise an illegal opcode + exception. This reduces the requirements for rare CR4 bits being + mapped into HFLAGS. */ +void helper_cr4_testbit(CPUX86State *env, uint32_t bit) +{ + if (unlikely((env->cr[4] & bit) == 0)) { + raise_exception_ra(env, EXCP06_ILLOP, GETPC()); + } +} |