Commit 5caa1833 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

target/i386: introduce cpu_set_fpus 



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

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 6f529b75

target/i386/fpu_helper.c

+8 −4
Original line number Diff line number Diff line
@@ -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);