libitm/config/riscv/target.h

   1 /* Copyright (C) 2022-2024 Free Software Foundation, Inc.
   2    Contributed by Xiongchuan Tan <xc-tan@outlook.com>.
   3
   4    This file is part of the GNU Transactional Memory Library (libitm).
   5
   6    Libitm is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14    more details.
  15
  16    Under Section 7 of GPL version 3, you are granted additional
  17    permissions described in the GCC Runtime Library Exception, version
  18    3.1, as published by the Free Software Foundation.
  19
  20    You should have received a copy of the GNU General Public License and
  21    a copy of the GCC Runtime Library Exception along with this program;
  22    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23    <http://www.gnu.org/licenses/>.  */
  24
  25 namespace GTM HIDDEN {
  26
  27 typedef struct gtm_jmpbuf
  28   {
  29     long int pc;
  30     void *cfa;
  31     long int s[12]; /* Saved registers, s0 is fp */
  32
  33 #if __riscv_xlen == 32
  34     /* Ensure that the stack is 16-byte aligned */
  35     long int padding[2];
  36 #endif
  37
  38     /* FP saved registers */
  39 #if defined(__riscv_flen) && __riscv_flen == 64
  40     double fs[12];
  41 #elif defined(__riscv_flen) && __riscv_flen == 32
  42     float fs[12];
  43 #elif defined(__riscv_flen)
  44 #  error Q-extension unsupported
  45 #endif
  46   } gtm_jmpbuf;
  47
  48 /* The size of one line in hardware caches (in bytes). */
  49 /* 64 bytes is a suggested value in the RVA profiles (see
  50    https://github.com/riscv/riscv-profiles/blob/main/profiles.adoc). */
  51 #define HW_CACHELINE_SIZE 64
  52
  53 static inline void
  54 cpu_relax (void)
  55 {
  56   #ifdef __riscv_zihintpause
  57       __asm volatile ("pause");
  58   #else
  59       /* Encoding of the pause instruction */
  60       __asm volatile (".4byte 0x100000F");
  61   #endif
  62 }
  63
  64 } // namespace GTM