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Linux/arch/mips/kernel/r2300_fpu.S

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  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 (davem@davemloft.net)
 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,fault;                                       \
 25         .previous
 26 
 27 #define EX2(a,b)                                                \
 28 9:      a,##b;                                                  \
 29         .section __ex_table,"a";                                \
 30         PTR     9b,bad_stack;                                   \
 31         PTR     9b+4,bad_stack;                                 \
 32         .previous
 33 
 34         .set    noreorder
 35         .set    mips1
 36 
 37 /**
 38  * _save_fp_context() - save FP context from the FPU
 39  * @a0 - pointer to fpregs field of sigcontext
 40  * @a1 - pointer to fpc_csr field of sigcontext
 41  *
 42  * Save FP context, including the 32 FP data registers and the FP
 43  * control & status register, from the FPU to signal context.
 44  */
 45 LEAF(_save_fp_context)
 46         .set    push
 47         SET_HARDFLOAT
 48         li      v0, 0                                   # assume success
 49         cfc1    t1, fcr31
 50         EX2(s.d $f0, 0(a0))
 51         EX2(s.d $f2, 16(a0))
 52         EX2(s.d $f4, 32(a0))
 53         EX2(s.d $f6, 48(a0))
 54         EX2(s.d $f8, 64(a0))
 55         EX2(s.d $f10, 80(a0))
 56         EX2(s.d $f12, 96(a0))
 57         EX2(s.d $f14, 112(a0))
 58         EX2(s.d $f16, 128(a0))
 59         EX2(s.d $f18, 144(a0))
 60         EX2(s.d $f20, 160(a0))
 61         EX2(s.d $f22, 176(a0))
 62         EX2(s.d $f24, 192(a0))
 63         EX2(s.d $f26, 208(a0))
 64         EX2(s.d $f28, 224(a0))
 65         EX2(s.d $f30, 240(a0))
 66         jr      ra
 67          EX(sw  t1, (a1))
 68         .set    pop
 69         END(_save_fp_context)
 70 
 71 /**
 72  * _restore_fp_context() - restore FP context to the FPU
 73  * @a0 - pointer to fpregs field of sigcontext
 74  * @a1 - pointer to fpc_csr field of sigcontext
 75  *
 76  * Restore FP context, including the 32 FP data registers and the FP
 77  * control & status register, from signal context to the FPU.
 78  */
 79 LEAF(_restore_fp_context)
 80         .set    push
 81         SET_HARDFLOAT
 82         li      v0, 0                                   # assume success
 83         EX(lw t0, (a1))
 84         EX2(l.d $f0, 0(a0))
 85         EX2(l.d $f2, 16(a0))
 86         EX2(l.d $f4, 32(a0))
 87         EX2(l.d $f6, 48(a0))
 88         EX2(l.d $f8, 64(a0))
 89         EX2(l.d $f10, 80(a0))
 90         EX2(l.d $f12, 96(a0))
 91         EX2(l.d $f14, 112(a0))
 92         EX2(l.d $f16, 128(a0))
 93         EX2(l.d $f18, 144(a0))
 94         EX2(l.d $f20, 160(a0))
 95         EX2(l.d $f22, 176(a0))
 96         EX2(l.d $f24, 192(a0))
 97         EX2(l.d $f26, 208(a0))
 98         EX2(l.d $f28, 224(a0))
 99         EX2(l.d $f30, 240(a0))
100         jr      ra
101          ctc1   t0, fcr31
102         .set    pop
103         END(_restore_fp_context)
104         .set    reorder
105 
106         .type   fault, @function
107         .ent    fault
108 fault:  li      v0, -EFAULT
109         jr      ra
110         .end    fault

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