root/arch/riscv/kernel/fpu.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  * Copyright (C) 2017 SiFive
   5  *
   6  *   This program is free software; you can redistribute it and/or
   7  *   modify it under the terms of the GNU General Public License
   8  *   as published by the Free Software Foundation, version 2.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details.
  14  */
  15 
  16 #include <linux/linkage.h>
  17 
  18 #include <asm/asm.h>
  19 #include <asm/csr.h>
  20 #include <asm/asm-offsets.h>
  21 
  22 ENTRY(__fstate_save)
  23         li  a2,  TASK_THREAD_F0
  24         add a0, a0, a2
  25         li t1, SR_FS
  26         csrs CSR_SSTATUS, t1
  27         frcsr t0
  28         fsd f0,  TASK_THREAD_F0_F0(a0)
  29         fsd f1,  TASK_THREAD_F1_F0(a0)
  30         fsd f2,  TASK_THREAD_F2_F0(a0)
  31         fsd f3,  TASK_THREAD_F3_F0(a0)
  32         fsd f4,  TASK_THREAD_F4_F0(a0)
  33         fsd f5,  TASK_THREAD_F5_F0(a0)
  34         fsd f6,  TASK_THREAD_F6_F0(a0)
  35         fsd f7,  TASK_THREAD_F7_F0(a0)
  36         fsd f8,  TASK_THREAD_F8_F0(a0)
  37         fsd f9,  TASK_THREAD_F9_F0(a0)
  38         fsd f10, TASK_THREAD_F10_F0(a0)
  39         fsd f11, TASK_THREAD_F11_F0(a0)
  40         fsd f12, TASK_THREAD_F12_F0(a0)
  41         fsd f13, TASK_THREAD_F13_F0(a0)
  42         fsd f14, TASK_THREAD_F14_F0(a0)
  43         fsd f15, TASK_THREAD_F15_F0(a0)
  44         fsd f16, TASK_THREAD_F16_F0(a0)
  45         fsd f17, TASK_THREAD_F17_F0(a0)
  46         fsd f18, TASK_THREAD_F18_F0(a0)
  47         fsd f19, TASK_THREAD_F19_F0(a0)
  48         fsd f20, TASK_THREAD_F20_F0(a0)
  49         fsd f21, TASK_THREAD_F21_F0(a0)
  50         fsd f22, TASK_THREAD_F22_F0(a0)
  51         fsd f23, TASK_THREAD_F23_F0(a0)
  52         fsd f24, TASK_THREAD_F24_F0(a0)
  53         fsd f25, TASK_THREAD_F25_F0(a0)
  54         fsd f26, TASK_THREAD_F26_F0(a0)
  55         fsd f27, TASK_THREAD_F27_F0(a0)
  56         fsd f28, TASK_THREAD_F28_F0(a0)
  57         fsd f29, TASK_THREAD_F29_F0(a0)
  58         fsd f30, TASK_THREAD_F30_F0(a0)
  59         fsd f31, TASK_THREAD_F31_F0(a0)
  60         sw t0, TASK_THREAD_FCSR_F0(a0)
  61         csrc CSR_SSTATUS, t1
  62         ret
  63 ENDPROC(__fstate_save)
  64 
  65 ENTRY(__fstate_restore)
  66         li  a2,  TASK_THREAD_F0
  67         add a0, a0, a2
  68         li t1, SR_FS
  69         lw t0, TASK_THREAD_FCSR_F0(a0)
  70         csrs CSR_SSTATUS, t1
  71         fld f0,  TASK_THREAD_F0_F0(a0)
  72         fld f1,  TASK_THREAD_F1_F0(a0)
  73         fld f2,  TASK_THREAD_F2_F0(a0)
  74         fld f3,  TASK_THREAD_F3_F0(a0)
  75         fld f4,  TASK_THREAD_F4_F0(a0)
  76         fld f5,  TASK_THREAD_F5_F0(a0)
  77         fld f6,  TASK_THREAD_F6_F0(a0)
  78         fld f7,  TASK_THREAD_F7_F0(a0)
  79         fld f8,  TASK_THREAD_F8_F0(a0)
  80         fld f9,  TASK_THREAD_F9_F0(a0)
  81         fld f10, TASK_THREAD_F10_F0(a0)
  82         fld f11, TASK_THREAD_F11_F0(a0)
  83         fld f12, TASK_THREAD_F12_F0(a0)
  84         fld f13, TASK_THREAD_F13_F0(a0)
  85         fld f14, TASK_THREAD_F14_F0(a0)
  86         fld f15, TASK_THREAD_F15_F0(a0)
  87         fld f16, TASK_THREAD_F16_F0(a0)
  88         fld f17, TASK_THREAD_F17_F0(a0)
  89         fld f18, TASK_THREAD_F18_F0(a0)
  90         fld f19, TASK_THREAD_F19_F0(a0)
  91         fld f20, TASK_THREAD_F20_F0(a0)
  92         fld f21, TASK_THREAD_F21_F0(a0)
  93         fld f22, TASK_THREAD_F22_F0(a0)
  94         fld f23, TASK_THREAD_F23_F0(a0)
  95         fld f24, TASK_THREAD_F24_F0(a0)
  96         fld f25, TASK_THREAD_F25_F0(a0)
  97         fld f26, TASK_THREAD_F26_F0(a0)
  98         fld f27, TASK_THREAD_F27_F0(a0)
  99         fld f28, TASK_THREAD_F28_F0(a0)
 100         fld f29, TASK_THREAD_F29_F0(a0)
 101         fld f30, TASK_THREAD_F30_F0(a0)
 102         fld f31, TASK_THREAD_F31_F0(a0)
 103         fscsr t0
 104         csrc CSR_SSTATUS, t1
 105         ret
 106 ENDPROC(__fstate_restore)