sysdeps/riscv/sys/asm.h

   1 /* Miscellaneous macros.
   2    Copyright (C) 2000-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _SYS_ASM_H
  20 #define _SYS_ASM_H
  21
  22 /* Macros to handle different pointer/register sizes for 32/64-bit code.  */
  23 #if __riscv_xlen == 64
  24 # define PTRLOG 3
  25 # define SZREG  8
  26 # define REG_S sd
  27 # define REG_L ld
  28 #elif __riscv_xlen == 32
  29 # error "rv32i-based targets are not supported"
  30 #else
  31 # error __riscv_xlen must equal 32 or 64
  32 #endif
  33
  34 #if !defined __riscv_float_abi_soft
  35 /* For ABI uniformity, reserve 8 bytes for floats, even if double-precision
  36    floating-point is not supported in hardware.  */
  37 # if defined __riscv_float_abi_double
  38 #  define FREG_L fld
  39 #  define FREG_S fsd
  40 #  define SZFREG 8
  41 # else
  42 #  error unsupported FLEN
  43 # endif
  44 #endif
  45
  46 /* Declare leaf routine.  */
  47 #define LEAF(symbol)                            \
  48                 .globl  symbol;                 \
  49                 .align  2;                      \
  50                 .type   symbol,@function;       \
  51 symbol:                                         \
  52                 cfi_startproc;
  53
  54 /* Mark end of function.  */
  55 #undef END
  56 #define END(function)                           \
  57                 cfi_endproc;                    \
  58                 .size   function,.-function
  59
  60 /* Stack alignment.  */
  61 #define ALMASK  ~15
  62
  63 #endif /* sys/asm.h */