newlib/libc/machine/riscv/sys/asm.h

   1 /* Copyright (c) 2017  SiFive Inc. All rights reserved.
   2
   3    This copyrighted material is made available to anyone wishing to use,
   4    modify, copy, or redistribute it subject to the terms and conditions
   5    of the FreeBSD License.   This program is distributed in the hope that
   6    it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
   7    including the implied warranties of MERCHANTABILITY or FITNESS FOR
   8    A PARTICULAR PURPOSE.  A copy of this license is available at
   9    http://www.opensource.org/licenses.
  10 */
  11
  12 #ifndef _SYS_ASM_H
  13 #define _SYS_ASM_H
  14
  15 /*
  16  * Macros to handle different pointer/register sizes for 32/64-bit code
  17  */
  18 #if __riscv_xlen == 64
  19 # define PTRLOG 3
  20 # define SZREG  8
  21 # define REG_S sd
  22 # define REG_L ld
  23 #elif __riscv_xlen == 32
  24 # define PTRLOG 2
  25 # define SZREG  4
  26 # define REG_S sw
  27 # define REG_L lw
  28 #else
  29 # error __riscv_xlen must equal 32 or 64
  30 #endif
  31
  32 #ifndef __riscv_float_abi_soft
  33 /* For ABI uniformity, reserve 8 bytes for floats, even if double-precision
  34    floating-point is not supported in hardware.  */
  35 # define SZFREG 8
  36 # ifdef __riscv_float_abi_single
  37 #  define FREG_L flw
  38 #  define FREG_S fsw
  39 # elif defined(__riscv_float_abi_double)
  40 #  define FREG_L fld
  41 #  define FREG_S fsd
  42 # elif defined(__riscv_float_abi_quad)
  43 #  define FREG_L flq
  44 #  define FREG_S fsq
  45 # else
  46 #  error unsupported FLEN
  47 # endif
  48 #endif
  49
  50 #endif /* sys/asm.h */