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