1/*
2 * VISsave.S: Code for saving FPU register state for
3 *            VIS routines. One should not call this directly,
4 *            but use macros provided in <asm/visasm.h>.
5 *
6 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
7 */
8
9#include <linux/linkage.h>
10
11#include <asm/asi.h>
12#include <asm/page.h>
13#include <asm/ptrace.h>
14#include <asm/visasm.h>
15#include <asm/thread_info.h>
16
17	/* On entry: %o5=current FPRS value, %g7 is callers address */
18	/* May clobber %o5, %g1, %g2, %g3, %g7, %icc, %xcc */
19
20	/* Nothing special need be done here to handle pre-emption, this
21	 * FPU save/restore mechanism is already preemption safe.
22	 */
23	.text
24	.align		32
25ENTRY(VISenter)
26	ldub		[%g6 + TI_FPDEPTH], %g1
27	brnz,a,pn	%g1, 1f
28	 cmp		%g1, 1
29	stb		%g0, [%g6 + TI_FPSAVED]
30	stx		%fsr, [%g6 + TI_XFSR]
319:	jmpl		%g7 + %g0, %g0
32	 nop
331:	bne,pn		%icc, 2f
34
35	 srl		%g1, 1, %g1
36vis1:	ldub		[%g6 + TI_FPSAVED], %g3
37	stx		%fsr, [%g6 + TI_XFSR]
38	or		%g3, %o5, %g3
39	stb		%g3, [%g6 + TI_FPSAVED]
40	rd		%gsr, %g3
41	clr		%g1
42	ba,pt		%xcc, 3f
43
44	 stx		%g3, [%g6 + TI_GSR]
452:	add		%g6, %g1, %g3
46	mov		FPRS_DU | FPRS_DL | FPRS_FEF, %o5
47	sll		%g1, 3, %g1
48	stb		%o5, [%g3 + TI_FPSAVED]
49	rd		%gsr, %g2
50	add		%g6, %g1, %g3
51	stx		%g2, [%g3 + TI_GSR]
52
53	add		%g6, %g1, %g2
54	stx		%fsr, [%g2 + TI_XFSR]
55	sll		%g1, 5, %g1
563:	andcc		%o5, FPRS_DL|FPRS_DU, %g0
57	be,pn		%icc, 9b
58	 add		%g6, TI_FPREGS, %g2
59	andcc		%o5, FPRS_DL, %g0
60
61	be,pn		%icc, 4f
62	 add		%g6, TI_FPREGS+0x40, %g3
63	membar		#Sync
64	stda		%f0, [%g2 + %g1] ASI_BLK_P
65	stda		%f16, [%g3 + %g1] ASI_BLK_P
66	membar		#Sync
67	andcc		%o5, FPRS_DU, %g0
68	be,pn		%icc, 5f
694:	 add		%g1, 128, %g1
70	membar		#Sync
71	stda		%f32, [%g2 + %g1] ASI_BLK_P
72
73	stda		%f48, [%g3 + %g1] ASI_BLK_P
745:	membar		#Sync
75	ba,pt		%xcc, 80f
76	 nop
77
78	.align		32
7980:	jmpl		%g7 + %g0, %g0
80	 nop
81ENDPROC(VISenter)
82