LXR linux/arch/mips/kernel/r2300

   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)                                                 \
  229:      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 */
  30LEAF(_save_fp_context)
  31        .set    push
  32        SET_HARDFLOAT
  33        li      v0, 0                                   # assume success
  34        cfc1    t1,fcr31
  35        EX(swc1 $f0,(SC_FPREGS+0)(a0))
  36        EX(swc1 $f1,(SC_FPREGS+8)(a0))
  37        EX(swc1 $f2,(SC_FPREGS+16)(a0))
  38        EX(swc1 $f3,(SC_FPREGS+24)(a0))
  39        EX(swc1 $f4,(SC_FPREGS+32)(a0))
  40        EX(swc1 $f5,(SC_FPREGS+40)(a0))
  41        EX(swc1 $f6,(SC_FPREGS+48)(a0))
  42        EX(swc1 $f7,(SC_FPREGS+56)(a0))
  43        EX(swc1 $f8,(SC_FPREGS+64)(a0))
  44        EX(swc1 $f9,(SC_FPREGS+72)(a0))
  45        EX(swc1 $f10,(SC_FPREGS+80)(a0))
  46        EX(swc1 $f11,(SC_FPREGS+88)(a0))
  47        EX(swc1 $f12,(SC_FPREGS+96)(a0))
  48        EX(swc1 $f13,(SC_FPREGS+104)(a0))
  49        EX(swc1 $f14,(SC_FPREGS+112)(a0))
  50        EX(swc1 $f15,(SC_FPREGS+120)(a0))
  51        EX(swc1 $f16,(SC_FPREGS+128)(a0))
  52        EX(swc1 $f17,(SC_FPREGS+136)(a0))
  53        EX(swc1 $f18,(SC_FPREGS+144)(a0))
  54        EX(swc1 $f19,(SC_FPREGS+152)(a0))
  55        EX(swc1 $f20,(SC_FPREGS+160)(a0))
  56        EX(swc1 $f21,(SC_FPREGS+168)(a0))
  57        EX(swc1 $f22,(SC_FPREGS+176)(a0))
  58        EX(swc1 $f23,(SC_FPREGS+184)(a0))
  59        EX(swc1 $f24,(SC_FPREGS+192)(a0))
  60        EX(swc1 $f25,(SC_FPREGS+200)(a0))
  61        EX(swc1 $f26,(SC_FPREGS+208)(a0))
  62        EX(swc1 $f27,(SC_FPREGS+216)(a0))
  63        EX(swc1 $f28,(SC_FPREGS+224)(a0))
  64        EX(swc1 $f29,(SC_FPREGS+232)(a0))
  65        EX(swc1 $f30,(SC_FPREGS+240)(a0))
  66        EX(swc1 $f31,(SC_FPREGS+248)(a0))
  67        EX(sw   t1,(SC_FPC_CSR)(a0))
  68        cfc1    t0,$0                           # implementation/version
  69        jr      ra
  70        .set    pop
  71        .set    nomacro
  72         EX(sw  t0,(SC_FPC_EIR)(a0))
  73        .set    macro
  74        END(_save_fp_context)
  75
  76/*
  77 * Restore FPU state:
  78 *  - fp gp registers
  79 *  - cp1 status/control register
  80 *
  81 * We base the decision which registers to restore from the signal stack
  82 * frame on the current content of c0_status, not on the content of the
  83 * stack frame which might have been changed by the user.
  84 */
  85LEAF(_restore_fp_context)
  86        .set    push
  87        SET_HARDFLOAT
  88        li      v0, 0                                   # assume success
  89        EX(lw t0,(SC_FPC_CSR)(a0))
  90        EX(lwc1 $f0,(SC_FPREGS+0)(a0))
  91        EX(lwc1 $f1,(SC_FPREGS+8)(a0))
  92        EX(lwc1 $f2,(SC_FPREGS+16)(a0))
  93        EX(lwc1 $f3,(SC_FPREGS+24)(a0))
  94        EX(lwc1 $f4,(SC_FPREGS+32)(a0))
  95        EX(lwc1 $f5,(SC_FPREGS+40)(a0))
  96        EX(lwc1 $f6,(SC_FPREGS+48)(a0))
  97        EX(lwc1 $f7,(SC_FPREGS+56)(a0))
  98        EX(lwc1 $f8,(SC_FPREGS+64)(a0))
  99        EX(lwc1 $f9,(SC_FPREGS+72)(a0))
 100        EX(lwc1 $f10,(SC_FPREGS+80)(a0))
 101        EX(lwc1 $f11,(SC_FPREGS+88)(a0))
 102        EX(lwc1 $f12,(SC_FPREGS+96)(a0))
 103        EX(lwc1 $f13,(SC_FPREGS+104)(a0))
 104        EX(lwc1 $f14,(SC_FPREGS+112)(a0))
 105        EX(lwc1 $f15,(SC_FPREGS+120)(a0))
 106        EX(lwc1 $f16,(SC_FPREGS+128)(a0))
 107        EX(lwc1 $f17,(SC_FPREGS+136)(a0))
 108        EX(lwc1 $f18,(SC_FPREGS+144)(a0))
 109        EX(lwc1 $f19,(SC_FPREGS+152)(a0))
 110        EX(lwc1 $f20,(SC_FPREGS+160)(a0))
 111        EX(lwc1 $f21,(SC_FPREGS+168)(a0))
 112        EX(lwc1 $f22,(SC_FPREGS+176)(a0))
 113        EX(lwc1 $f23,(SC_FPREGS+184)(a0))
 114        EX(lwc1 $f24,(SC_FPREGS+192)(a0))
 115        EX(lwc1 $f25,(SC_FPREGS+200)(a0))
 116        EX(lwc1 $f26,(SC_FPREGS+208)(a0))
 117        EX(lwc1 $f27,(SC_FPREGS+216)(a0))
 118        EX(lwc1 $f28,(SC_FPREGS+224)(a0))
 119        EX(lwc1 $f29,(SC_FPREGS+232)(a0))
 120        EX(lwc1 $f30,(SC_FPREGS+240)(a0))
 121        EX(lwc1 $f31,(SC_FPREGS+248)(a0))
 122        jr      ra
 123         ctc1   t0,fcr31
 124        .set    pop
 125        END(_restore_fp_context)
 126        .set    reorder
 127
 128        .type   fault@function
 129        .ent    fault
 130fault:  li      v0, -EFAULT
 131        jr      ra
 132        .end    fault
 133