3  * FPU signal frame handling routines.
10 #include <asm/fpu/signal.h>
11 #include <asm/fpu/regset.h>
12 #include <asm/fpu/xstate.h>
16 #include <asm/trace/fpu.h>
41 	    fx_sw->xstate_size > current->thread.fpu.fpstate->user_size ||  in check_xstate_in_sigframe()
57 	trace_x86_fpu_xstate_check_failed(&current->thread.fpu);  in check_xstate_in_sigframe()
72 		struct xregs_state *xsave = &tsk->thread.fpu.fpstate->regs.xsave;  in save_fsave_header()
78 			fxsave(&tsk->thread.fpu.fpstate->regs.fxsave);  in save_fsave_header()
171  * Save the fpu, extended register state to the user signal frame.
192 	struct fpstate *fpstate = tsk->thread.fpu.fpstate;  in copy_fpstate_to_sigframe()
222 	 * Load the FPU registers if they are not valid for the current task.  in copy_fpstate_to_sigframe()
223 	 * With a valid FPU state we can attempt to save the state directly to  in copy_fpstate_to_sigframe()
275  * Attempt to restore the FPU registers directly from user memory.
280 	struct fpu *fpu = &current->thread.fpu;  in restore_fpregs_from_user()  local
284 	xrestore &= fpu->fpstate->user_xfeatures;  in restore_fpregs_from_user()
288 	xfd_update_state(fpu->fpstate);  in restore_fpregs_from_user()
290 	ret = __restore_fpregs_from_user(buf, fpu->fpstate->user_xfeatures,  in restore_fpregs_from_user()
296 		 * The above did an FPU restore operation, restricted to  in restore_fpregs_from_user()
298 		 * microcode might have modified the FPU registers  in restore_fpregs_from_user()
301 		 * If the FPU registers do not belong to current, then  in restore_fpregs_from_user()
302 		 * invalidate the FPU register state otherwise the task  in restore_fpregs_from_user()
304 		 * corrupted FPU registers.  in restore_fpregs_from_user()
314 		if (!fault_in_readable(buf, fpu->fpstate->user_size))  in restore_fpregs_from_user()
325 	 * this does not work because the rest of the FPU registers have  in restore_fpregs_from_user()
329 		os_xrstor_supervisor(fpu->fpstate);  in restore_fpregs_from_user()
340 	struct fpu *fpu = &tsk->thread.fpu;  in __fpu_restore_sig()  local
359 		/* Restore the FPU registers directly from user memory. */  in __fpu_restore_sig()
388 			os_xsave(fpu->fpstate);  in __fpu_restore_sig()
391 	__fpu_invalidate_fpregs_state(fpu);  in __fpu_restore_sig()
395 	fpregs = &fpu->fpstate->regs;  in __fpu_restore_sig()
435 		success = !os_xrstor_safe(fpu->fpstate,  in __fpu_restore_sig()
456  * Restore FPU state from a sigframe:
460 	struct fpu *fpu = &current->thread.fpu;  in fpu__restore_sig()  local
467 		fpu__clear_user_states(fpu);  in fpu__restore_sig()
471 	size = xstate_sigframe_size(fpu->fpstate);  in fpu__restore_sig()
499 		fpu__clear_user_states(fpu);  in fpu__restore_sig()
507 	unsigned long frame_size = xstate_sigframe_size(current->thread.fpu.fpstate);  in fpu__alloc_mathframe()