1/*
2 * r6000_fpu.S: Save/restore floating point context for signal handlers.
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License.  See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1996 by Ralf Baechle
9 *
10 * Multi-arch abstraction and asm macros for easier reading:
11 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
12 */
13#include <asm/asm.h>
14#include <asm/fpregdef.h>
15#include <asm/mipsregs.h>
16#include <asm/asm-offsets.h>
17#include <asm/regdef.h>
18
19	.set	noreorder
20	.set	mips2
21	.set	push
22	SET_HARDFLOAT
23
24	/* Save floating point context */
25	LEAF(_save_fp_context)
26	mfc0	t0,CP0_STATUS
27	sll	t0,t0,2
28	bgez	t0,1f
29	 nop
30
31	cfc1	t1,fcr31
32	/* Store the 16 double precision registers */
33	sdc1	$f0,(SC_FPREGS+0)(a0)
34	sdc1	$f2,(SC_FPREGS+16)(a0)
35	sdc1	$f4,(SC_FPREGS+32)(a0)
36	sdc1	$f6,(SC_FPREGS+48)(a0)
37	sdc1	$f8,(SC_FPREGS+64)(a0)
38	sdc1	$f10,(SC_FPREGS+80)(a0)
39	sdc1	$f12,(SC_FPREGS+96)(a0)
40	sdc1	$f14,(SC_FPREGS+112)(a0)
41	sdc1	$f16,(SC_FPREGS+128)(a0)
42	sdc1	$f18,(SC_FPREGS+144)(a0)
43	sdc1	$f20,(SC_FPREGS+160)(a0)
44	sdc1	$f22,(SC_FPREGS+176)(a0)
45	sdc1	$f24,(SC_FPREGS+192)(a0)
46	sdc1	$f26,(SC_FPREGS+208)(a0)
47	sdc1	$f28,(SC_FPREGS+224)(a0)
48	sdc1	$f30,(SC_FPREGS+240)(a0)
49	jr	ra
50	 sw	t0,SC_FPC_CSR(a0)
511:	jr	ra
52	 nop
53	END(_save_fp_context)
54
55/* Restore FPU state:
56 *  - fp gp registers
57 *  - cp1 status/control register
58 *
59 * We base the decision which registers to restore from the signal stack
60 * frame on the current content of c0_status, not on the content of the
61 * stack frame which might have been changed by the user.
62 */
63	LEAF(_restore_fp_context)
64	mfc0	t0,CP0_STATUS
65	sll	t0,t0,2
66
67	bgez	t0,1f
68	 lw	t0,SC_FPC_CSR(a0)
69	/* Restore the 16 double precision registers */
70	ldc1	$f0,(SC_FPREGS+0)(a0)
71	ldc1	$f2,(SC_FPREGS+16)(a0)
72	ldc1	$f4,(SC_FPREGS+32)(a0)
73	ldc1	$f6,(SC_FPREGS+48)(a0)
74	ldc1	$f8,(SC_FPREGS+64)(a0)
75	ldc1	$f10,(SC_FPREGS+80)(a0)
76	ldc1	$f12,(SC_FPREGS+96)(a0)
77	ldc1	$f14,(SC_FPREGS+112)(a0)
78	ldc1	$f16,(SC_FPREGS+128)(a0)
79	ldc1	$f18,(SC_FPREGS+144)(a0)
80	ldc1	$f20,(SC_FPREGS+160)(a0)
81	ldc1	$f22,(SC_FPREGS+176)(a0)
82	ldc1	$f24,(SC_FPREGS+192)(a0)
83	ldc1	$f26,(SC_FPREGS+208)(a0)
84	ldc1	$f28,(SC_FPREGS+224)(a0)
85	ldc1	$f30,(SC_FPREGS+240)(a0)
86	jr	ra
87	 ctc1	t0,fcr31
881:	jr	ra
89	 nop
90	END(_restore_fp_context)
91
92	.set pop	/* SET_HARDFLOAT */
93