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target/i386: introduce cpu_set_fpus 

In the next patch, this will provide a hook to detect clearing of
FSW.ES.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-10-16 10:02:57 +02:00
parent 6f529b7534
commit 5caa1833d2
1 changed files with 8 additions and 4 deletions
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12
target/i386/fpu_helper.c
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@ -1053,6 +1053,12 @@ void helper_fstenv(CPUX86State *env, target_ulong ptr, int data32)
do_fstenv(env, ptr, data32, GETPC());
}
static void cpu_set_fpus(CPUX86State *env, uint16_t fpus)
{
env->fpstt = (fpus >> 11) & 7;
env->fpus = fpus & ~0x3800;
}
static void do_fldenv(CPUX86State *env, target_ulong ptr, int data32,
uintptr_t retaddr)
{
@ -1067,8 +1073,7 @@ static void do_fldenv(CPUX86State *env, target_ulong ptr, int data32,
fpus = cpu_lduw_data_ra(env, ptr + 2, retaddr);
fptag = cpu_lduw_data_ra(env, ptr + 4, retaddr);
}
env->fpstt = (fpus >> 11) & 7;
env->fpus = fpus & ~0x3800;
cpu_set_fpus(env, fpus);
for (i = 0; i < 8; i++) {
env->fptags[i] = ((fptag & 3) == 3);
fptag >>= 2;
@ -1316,8 +1321,7 @@ static void do_xrstor_fpu(CPUX86State *env, target_ulong ptr, uintptr_t ra)
fpus = cpu_lduw_data_ra(env, ptr + XO(legacy.fsw), ra);
fptag = cpu_lduw_data_ra(env, ptr + XO(legacy.ftw), ra);
cpu_set_fpuc(env, fpuc);
env->fpstt = (fpus >> 11) & 7;
env->fpus = fpus & ~0x3800;
cpu_set_fpus(env, fpus);
fptag ^= 0xff;
for (i = 0; i < 8; i++) {
env->fptags[i] = ((fptag >> i) & 1);