1 /* 1 /*
2 * This file is subject to the terms and condi 2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the mai 3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details. 4 * for more details.
5 * 5 *
6 * Copyright (C) 1996, 1998 by Ralf Baechle 6 * Copyright (C) 1996, 1998 by Ralf Baechle
7 * 7 *
8 * Multi-arch abstraction and asm macros for e 8 * Multi-arch abstraction and asm macros for easier reading:
9 * Copyright (C) 1996 David S. Miller (davem@d 9 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
10 * 10 *
11 * Further modifications to make this work: 11 * Further modifications to make this work:
12 * Copyright (c) 1998 Harald Koerfgen 12 * Copyright (c) 1998 Harald Koerfgen
13 */ 13 */
14 #include <linux/export.h> 14 #include <linux/export.h>
15 #include <asm/asm.h> 15 #include <asm/asm.h>
16 #include <asm/asmmacro.h> 16 #include <asm/asmmacro.h>
17 #include <asm/errno.h> 17 #include <asm/errno.h>
18 #include <asm/fpregdef.h> 18 #include <asm/fpregdef.h>
19 #include <asm/mipsregs.h> 19 #include <asm/mipsregs.h>
20 #include <asm/asm-offsets.h> 20 #include <asm/asm-offsets.h>
21 #include <asm/regdef.h> 21 #include <asm/regdef.h>
22 22
23 #define EX(a,b) 23 #define EX(a,b) \
24 9: a,##b; 24 9: a,##b; \
25 .section __ex_table,"a"; 25 .section __ex_table,"a"; \
26 PTR_WD 9b,fault; 26 PTR_WD 9b,fault; \
27 .previous 27 .previous
28 28
29 #define EX2(a,b) 29 #define EX2(a,b) \
30 9: a,##b; 30 9: a,##b; \
31 .section __ex_table,"a"; 31 .section __ex_table,"a"; \
32 PTR_WD 9b,fault; 32 PTR_WD 9b,fault; \
33 PTR_WD 9b+4,fault; 33 PTR_WD 9b+4,fault; \
34 .previous 34 .previous
35 35
36 .set mips1 36 .set mips1
37 37
38 /* 38 /*
39 * Save a thread's fp context. 39 * Save a thread's fp context.
40 */ 40 */
41 LEAF(_save_fp) 41 LEAF(_save_fp)
42 EXPORT_SYMBOL(_save_fp) 42 EXPORT_SYMBOL(_save_fp)
43 fpu_save_single a0, t1 43 fpu_save_single a0, t1 # clobbers t1
44 jr ra 44 jr ra
45 END(_save_fp) 45 END(_save_fp)
46 46
47 /* 47 /*
48 * Restore a thread's fp context. 48 * Restore a thread's fp context.
49 */ 49 */
50 LEAF(_restore_fp) 50 LEAF(_restore_fp)
51 fpu_restore_single a0, t1 51 fpu_restore_single a0, t1 # clobbers t1
52 jr ra 52 jr ra
53 END(_restore_fp) 53 END(_restore_fp)
54 54
55 .set noreorder 55 .set noreorder
56 56
57 /** 57 /**
58 * _save_fp_context() - save FP context from t 58 * _save_fp_context() - save FP context from the FPU
59 * @a0 - pointer to fpregs field of sigcontext 59 * @a0 - pointer to fpregs field of sigcontext
60 * @a1 - pointer to fpc_csr field of sigcontex 60 * @a1 - pointer to fpc_csr field of sigcontext
61 * 61 *
62 * Save FP context, including the 32 FP data r 62 * Save FP context, including the 32 FP data registers and the FP
63 * control & status register, from the FPU to 63 * control & status register, from the FPU to signal context.
64 */ 64 */
65 LEAF(_save_fp_context) 65 LEAF(_save_fp_context)
66 .set push 66 .set push
67 .set hardfloat 67 .set hardfloat
68 li v0, 0 68 li v0, 0 # assume success
69 cfc1 t1, fcr31 69 cfc1 t1, fcr31
70 EX2(s.d $f0, 0(a0)) 70 EX2(s.d $f0, 0(a0))
71 EX2(s.d $f2, 16(a0)) 71 EX2(s.d $f2, 16(a0))
72 EX2(s.d $f4, 32(a0)) 72 EX2(s.d $f4, 32(a0))
73 EX2(s.d $f6, 48(a0)) 73 EX2(s.d $f6, 48(a0))
74 EX2(s.d $f8, 64(a0)) 74 EX2(s.d $f8, 64(a0))
75 EX2(s.d $f10, 80(a0)) 75 EX2(s.d $f10, 80(a0))
76 EX2(s.d $f12, 96(a0)) 76 EX2(s.d $f12, 96(a0))
77 EX2(s.d $f14, 112(a0)) 77 EX2(s.d $f14, 112(a0))
78 EX2(s.d $f16, 128(a0)) 78 EX2(s.d $f16, 128(a0))
79 EX2(s.d $f18, 144(a0)) 79 EX2(s.d $f18, 144(a0))
80 EX2(s.d $f20, 160(a0)) 80 EX2(s.d $f20, 160(a0))
81 EX2(s.d $f22, 176(a0)) 81 EX2(s.d $f22, 176(a0))
82 EX2(s.d $f24, 192(a0)) 82 EX2(s.d $f24, 192(a0))
83 EX2(s.d $f26, 208(a0)) 83 EX2(s.d $f26, 208(a0))
84 EX2(s.d $f28, 224(a0)) 84 EX2(s.d $f28, 224(a0))
85 EX2(s.d $f30, 240(a0)) 85 EX2(s.d $f30, 240(a0))
86 jr ra 86 jr ra
87 EX(sw t1, (a1)) 87 EX(sw t1, (a1))
88 .set pop 88 .set pop
89 END(_save_fp_context) 89 END(_save_fp_context)
90 90
91 /** 91 /**
92 * _restore_fp_context() - restore FP context 92 * _restore_fp_context() - restore FP context to the FPU
93 * @a0 - pointer to fpregs field of sigcontext 93 * @a0 - pointer to fpregs field of sigcontext
94 * @a1 - pointer to fpc_csr field of sigcontex 94 * @a1 - pointer to fpc_csr field of sigcontext
95 * 95 *
96 * Restore FP context, including the 32 FP dat 96 * Restore FP context, including the 32 FP data registers and the FP
97 * control & status register, from signal cont 97 * control & status register, from signal context to the FPU.
98 */ 98 */
99 LEAF(_restore_fp_context) 99 LEAF(_restore_fp_context)
100 .set push 100 .set push
101 .set hardfloat 101 .set hardfloat
102 li v0, 0 102 li v0, 0 # assume success
103 EX(lw t0, (a1)) 103 EX(lw t0, (a1))
104 EX2(l.d $f0, 0(a0)) 104 EX2(l.d $f0, 0(a0))
105 EX2(l.d $f2, 16(a0)) 105 EX2(l.d $f2, 16(a0))
106 EX2(l.d $f4, 32(a0)) 106 EX2(l.d $f4, 32(a0))
107 EX2(l.d $f6, 48(a0)) 107 EX2(l.d $f6, 48(a0))
108 EX2(l.d $f8, 64(a0)) 108 EX2(l.d $f8, 64(a0))
109 EX2(l.d $f10, 80(a0)) 109 EX2(l.d $f10, 80(a0))
110 EX2(l.d $f12, 96(a0)) 110 EX2(l.d $f12, 96(a0))
111 EX2(l.d $f14, 112(a0)) 111 EX2(l.d $f14, 112(a0))
112 EX2(l.d $f16, 128(a0)) 112 EX2(l.d $f16, 128(a0))
113 EX2(l.d $f18, 144(a0)) 113 EX2(l.d $f18, 144(a0))
114 EX2(l.d $f20, 160(a0)) 114 EX2(l.d $f20, 160(a0))
115 EX2(l.d $f22, 176(a0)) 115 EX2(l.d $f22, 176(a0))
116 EX2(l.d $f24, 192(a0)) 116 EX2(l.d $f24, 192(a0))
117 EX2(l.d $f26, 208(a0)) 117 EX2(l.d $f26, 208(a0))
118 EX2(l.d $f28, 224(a0)) 118 EX2(l.d $f28, 224(a0))
119 EX2(l.d $f30, 240(a0)) 119 EX2(l.d $f30, 240(a0))
120 jr ra 120 jr ra
121 ctc1 t0, fcr31 121 ctc1 t0, fcr31
122 .set pop 122 .set pop
123 END(_restore_fp_context) 123 END(_restore_fp_context)
124 .set reorder 124 .set reorder
125 125
126 .type fault, @function 126 .type fault, @function
127 .ent fault 127 .ent fault
128 fault: li v0, -EFAULT 128 fault: li v0, -EFAULT
129 jr ra 129 jr ra
130 .end fault 130 .end fault
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