Commit 710c15a2e9078931f496424d8e10241f4930f940
1 parent
443f1376
lmsw fix (aka dos4gw bug)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@885 c046a42c-6fe2-441c-8c8c-71466251a162
Showing
1 changed file
with
3 additions
and
2 deletions
target-i386/op.c
| @@ -980,8 +980,9 @@ void OPPROTO op_movl_drN_T0(void) | @@ -980,8 +980,9 @@ void OPPROTO op_movl_drN_T0(void) | ||
| 980 | 980 | ||
| 981 | void OPPROTO op_lmsw_T0(void) | 981 | void OPPROTO op_lmsw_T0(void) |
| 982 | { | 982 | { |
| 983 | - /* only 4 lower bits of CR0 are modified */ | ||
| 984 | - T0 = (env->cr[0] & ~0xf) | (T0 & 0xf); | 983 | + /* only 4 lower bits of CR0 are modified. PE cannot be set to zero |
| 984 | + if already set to one. */ | ||
| 985 | + T0 = (env->cr[0] & ~0xe) | (T0 & 0xf); | ||
| 985 | helper_movl_crN_T0(0); | 986 | helper_movl_crN_T0(0); |
| 986 | } | 987 | } |
| 987 | 988 |