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 (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