/*
* Restore the extended state if present. Otherwise, restore the FP/SSE state.
*/
static inline int restore_user_xstate(void __user *buf, u64 xbv, int fx_only)
{
if (use_xsave()) {
if ((unsigned long)buf % 64 || fx_only) {
u64 init_bv = pcntxt_mask & ~XSTATE_FPSSE;
xrstor_state(init_xstate_buf, init_bv);
return fxrstor_user(buf);
} else {
u64 init_bv = pcntxt_mask & ~xbv;
if (unlikely(init_bv))
xrstor_state(init_xstate_buf, init_bv);
return xrestore_user(buf, xbv);
}
} else if (use_fxsr()) {
return fxrstor_user(buf);
} else
return frstor_user(buf);
}
/*
* Restore the extended state if present. Otherwise, restore the FP/SSE
* state.
*/
static int restore_user_xstate(void __user *buf)
{
struct _fpx_sw_bytes fx_sw_user;
u64 mask;
int err;
if (((unsigned long)buf % 64) ||
check_for_xstate(buf, buf, &fx_sw_user))
goto fx_only;
mask = fx_sw_user.xstate_bv;
/*
* restore the state passed by the user.
*/
err = xrestore_user(buf, mask);
if (err)
return err;
/*
* init the state skipped by the user.
*/
mask = pcntxt_mask & ~mask;
if (unlikely(mask))
xrstor_state(init_xstate_buf, mask);
return 0;
fx_only:
/*
* couldn't find the extended state information in the
* memory layout. Restore just the FP/SSE and init all
* the other extended state.
*/
xrstor_state(init_xstate_buf, pcntxt_mask & ~XSTATE_FPSSE);
return fxrstor_checking((struct i387_fxsave_struct __force_kernel *)buf);
}
static int restore_user_xstate(void __user *buf)
{
struct _fpx_sw_bytes fx_sw_user;
u64 mask;
int err;
if (((unsigned long)buf % 64) ||
check_for_xstate(buf, buf, &fx_sw_user))
goto fx_only;
mask = fx_sw_user.xstate_bv;
/*
*/
err = xrestore_user(buf, mask);
if (err)
return err;
/*
*/
mask = pcntxt_mask & ~mask;
if (unlikely(mask))
xrstor_state(init_xstate_buf, mask);
return 0;
fx_only:
/*
*/
xrstor_state(init_xstate_buf, pcntxt_mask & ~XSTATE_FPSSE);
return fxrstor_checking((__force struct i387_fxsave_struct *)buf);
}
