Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6
[linux-2.6] / arch / mips / kernel / r2300_fpu.S
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 1996, 1998 by Ralf Baechle
7  *
8  * Multi-arch abstraction and asm macros for easier reading:
9  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
10  *
11  * Further modifications to make this work:
12  * Copyright (c) 1998 Harald Koerfgen
13  */
14 #include <asm/asm.h>
15 #include <asm/errno.h>
16 #include <asm/fpregdef.h>
17 #include <asm/mipsregs.h>
18 #include <asm/asm-offsets.h>
19 #include <asm/regdef.h>
20
21 #define EX(a,b)                                                 \
22 9:      a,##b;                                                  \
23         .section __ex_table,"a";                                \
24         PTR     9b,bad_stack;                                   \
25         .previous
26
27         .set    noreorder
28         .set    mips1
29         /* Save floating point context */
30 LEAF(_save_fp_context)
31         li      v0, 0                                   # assume success
32         cfc1    t1,fcr31
33         EX(swc1 $f0,(SC_FPREGS+0)(a0))
34         EX(swc1 $f1,(SC_FPREGS+8)(a0))
35         EX(swc1 $f2,(SC_FPREGS+16)(a0))
36         EX(swc1 $f3,(SC_FPREGS+24)(a0))
37         EX(swc1 $f4,(SC_FPREGS+32)(a0))
38         EX(swc1 $f5,(SC_FPREGS+40)(a0))
39         EX(swc1 $f6,(SC_FPREGS+48)(a0))
40         EX(swc1 $f7,(SC_FPREGS+56)(a0))
41         EX(swc1 $f8,(SC_FPREGS+64)(a0))
42         EX(swc1 $f9,(SC_FPREGS+72)(a0))
43         EX(swc1 $f10,(SC_FPREGS+80)(a0))
44         EX(swc1 $f11,(SC_FPREGS+88)(a0))
45         EX(swc1 $f12,(SC_FPREGS+96)(a0))
46         EX(swc1 $f13,(SC_FPREGS+104)(a0))
47         EX(swc1 $f14,(SC_FPREGS+112)(a0))
48         EX(swc1 $f15,(SC_FPREGS+120)(a0))
49         EX(swc1 $f16,(SC_FPREGS+128)(a0))
50         EX(swc1 $f17,(SC_FPREGS+136)(a0))
51         EX(swc1 $f18,(SC_FPREGS+144)(a0))
52         EX(swc1 $f19,(SC_FPREGS+152)(a0))
53         EX(swc1 $f20,(SC_FPREGS+160)(a0))
54         EX(swc1 $f21,(SC_FPREGS+168)(a0))
55         EX(swc1 $f22,(SC_FPREGS+176)(a0))
56         EX(swc1 $f23,(SC_FPREGS+184)(a0))
57         EX(swc1 $f24,(SC_FPREGS+192)(a0))
58         EX(swc1 $f25,(SC_FPREGS+200)(a0))
59         EX(swc1 $f26,(SC_FPREGS+208)(a0))
60         EX(swc1 $f27,(SC_FPREGS+216)(a0))
61         EX(swc1 $f28,(SC_FPREGS+224)(a0))
62         EX(swc1 $f29,(SC_FPREGS+232)(a0))
63         EX(swc1 $f30,(SC_FPREGS+240)(a0))
64         EX(swc1 $f31,(SC_FPREGS+248)(a0))
65         EX(sw   t1,(SC_FPC_CSR)(a0))
66         cfc1    t0,$0                           # implementation/version
67         jr      ra
68         .set    nomacro
69          EX(sw  t0,(SC_FPC_EIR)(a0))
70         .set    macro
71         END(_save_fp_context)
72
73 /*
74  * Restore FPU state:
75  *  - fp gp registers
76  *  - cp1 status/control register
77  *
78  * We base the decision which registers to restore from the signal stack
79  * frame on the current content of c0_status, not on the content of the
80  * stack frame which might have been changed by the user.
81  */
82 LEAF(_restore_fp_context)
83         li      v0, 0                                   # assume success
84         EX(lw t0,(SC_FPC_CSR)(a0))
85         EX(lwc1 $f0,(SC_FPREGS+0)(a0))
86         EX(lwc1 $f1,(SC_FPREGS+8)(a0))
87         EX(lwc1 $f2,(SC_FPREGS+16)(a0))
88         EX(lwc1 $f3,(SC_FPREGS+24)(a0))
89         EX(lwc1 $f4,(SC_FPREGS+32)(a0))
90         EX(lwc1 $f5,(SC_FPREGS+40)(a0))
91         EX(lwc1 $f6,(SC_FPREGS+48)(a0))
92         EX(lwc1 $f7,(SC_FPREGS+56)(a0))
93         EX(lwc1 $f8,(SC_FPREGS+64)(a0))
94         EX(lwc1 $f9,(SC_FPREGS+72)(a0))
95         EX(lwc1 $f10,(SC_FPREGS+80)(a0))
96         EX(lwc1 $f11,(SC_FPREGS+88)(a0))
97         EX(lwc1 $f12,(SC_FPREGS+96)(a0))
98         EX(lwc1 $f13,(SC_FPREGS+104)(a0))
99         EX(lwc1 $f14,(SC_FPREGS+112)(a0))
100         EX(lwc1 $f15,(SC_FPREGS+120)(a0))
101         EX(lwc1 $f16,(SC_FPREGS+128)(a0))
102         EX(lwc1 $f17,(SC_FPREGS+136)(a0))
103         EX(lwc1 $f18,(SC_FPREGS+144)(a0))
104         EX(lwc1 $f19,(SC_FPREGS+152)(a0))
105         EX(lwc1 $f20,(SC_FPREGS+160)(a0))
106         EX(lwc1 $f21,(SC_FPREGS+168)(a0))
107         EX(lwc1 $f22,(SC_FPREGS+176)(a0))
108         EX(lwc1 $f23,(SC_FPREGS+184)(a0))
109         EX(lwc1 $f24,(SC_FPREGS+192)(a0))
110         EX(lwc1 $f25,(SC_FPREGS+200)(a0))
111         EX(lwc1 $f26,(SC_FPREGS+208)(a0))
112         EX(lwc1 $f27,(SC_FPREGS+216)(a0))
113         EX(lwc1 $f28,(SC_FPREGS+224)(a0))
114         EX(lwc1 $f29,(SC_FPREGS+232)(a0))
115         EX(lwc1 $f30,(SC_FPREGS+240)(a0))
116         EX(lwc1 $f31,(SC_FPREGS+248)(a0))
117         jr      ra
118          ctc1   t0,fcr31
119         END(_restore_fp_context)
120         .set    reorder
121
122         .type   fault@function
123         .ent    fault
124 fault:  li      v0, -EFAULT
125         jr      ra
126         .end    fault