1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * VISsave.S: Code for saving FPU register state for
 4 *            VIS routines. One should not call this directly,
 5 *            but use macros provided in <asm/visasm.h>.
 6 *
 7 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
 8 */
 9
10#include <linux/linkage.h>
11
12#include <asm/asi.h>
13#include <asm/page.h>
14#include <asm/ptrace.h>
15#include <asm/visasm.h>
16#include <asm/thread_info.h>
17#include <asm/export.h>
18
19	/* On entry: %o5=current FPRS value, %g7 is callers address */
20	/* May clobber %o5, %g1, %g2, %g3, %g7, %icc, %xcc */
21
22	/* Nothing special need be done here to handle pre-emption, this
23	 * FPU save/restore mechanism is already preemption safe.
24	 */
25	.text
26	.align		32
27ENTRY(VISenter)
28	ldub		[%g6 + TI_FPDEPTH], %g1
29	brnz,a,pn	%g1, 1f
30	 cmp		%g1, 1
31	stb		%g0, [%g6 + TI_FPSAVED]
32	stx		%fsr, [%g6 + TI_XFSR]
339:	jmpl		%g7 + %g0, %g0
34	 nop
351:	bne,pn		%icc, 2f
36
37	 srl		%g1, 1, %g1
38vis1:	ldub		[%g6 + TI_FPSAVED], %g3
39	stx		%fsr, [%g6 + TI_XFSR]
40	or		%g3, %o5, %g3
41	stb		%g3, [%g6 + TI_FPSAVED]
42	rd		%gsr, %g3
43	clr		%g1
44	ba,pt		%xcc, 3f
45
46	 stx		%g3, [%g6 + TI_GSR]
472:	add		%g6, %g1, %g3
48	mov		FPRS_DU | FPRS_DL | FPRS_FEF, %o5
49	sll		%g1, 3, %g1
50	stb		%o5, [%g3 + TI_FPSAVED]
51	rd		%gsr, %g2
52	add		%g6, %g1, %g3
53	stx		%g2, [%g3 + TI_GSR]
54
55	add		%g6, %g1, %g2
56	stx		%fsr, [%g2 + TI_XFSR]
57	sll		%g1, 5, %g1
583:	andcc		%o5, FPRS_DL|FPRS_DU, %g0
59	be,pn		%icc, 9b
60	 add		%g6, TI_FPREGS, %g2
61	andcc		%o5, FPRS_DL, %g0
62
63	be,pn		%icc, 4f
64	 add		%g6, TI_FPREGS+0x40, %g3
65	membar		#Sync
66	stda		%f0, [%g2 + %g1] ASI_BLK_P
67	stda		%f16, [%g3 + %g1] ASI_BLK_P
68	membar		#Sync
69	andcc		%o5, FPRS_DU, %g0
70	be,pn		%icc, 5f
714:	 add		%g1, 128, %g1
72	membar		#Sync
73	stda		%f32, [%g2 + %g1] ASI_BLK_P
74
75	stda		%f48, [%g3 + %g1] ASI_BLK_P
765:	membar		#Sync
77	ba,pt		%xcc, 80f
78	 nop
79
80	.align		32
8180:	jmpl		%g7 + %g0, %g0
82	 nop
83ENDPROC(VISenter)
84EXPORT_SYMBOL(VISenter)

 
 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)