| 1 | /* |
| 2 | * RISC-V translation routines for the RISC-V Zawrs Extension. |
| 3 | * |
| 4 | * Copyright (c) 2022 Christoph Muellner, christoph.muellner@vrull.io |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2 or later, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along with |
| 16 | * this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | static bool trans_wrs_sto(DisasContext *ctx, arg_wrs_sto *a) |
| 20 | { |
| 21 | if (!ctx->cfg_ptr->ext_zawrs) { |
| 22 | return false; |
| 23 | } |
| 24 | |
| 25 | /* |
| 26 | * The specification says: |
| 27 | * While stalled, an implementation is permitted to occasionally |
| 28 | * terminate the stall and complete execution for any reason. |
| 29 | * |
| 30 | * So let's just exit TB and return to the main loop. |
| 31 | */ |
| 32 | |
| 33 | /* Clear the load reservation (if any). */ |
| 34 | tcg_gen_movi_tl(load_res, -1); |
| 35 | |
| 36 | gen_update_pc(ctx, ctx->cur_insn_len); |
| 37 | tcg_gen_exit_tb(NULL, 0); |
| 38 | ctx->base.is_jmp = DISAS_NORETURN; |
| 39 | |
| 40 | return true; |
| 41 | } |
| 42 | |
| 43 | static bool trans_wrs_nto(DisasContext *ctx, arg_wrs_nto *a) |
| 44 | { |
| 45 | if (!ctx->cfg_ptr->ext_zawrs) { |
| 46 | return false; |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * Depending on the mode of execution, mstatus.TW and hstatus.VTW, wrs.nto |
| 51 | * should raise an exception when the implementation-specific bounded time |
| 52 | * limit has expired. Our time limit is zero, so we either return |
| 53 | * immediately, as does our implementation of wrs.sto, or raise an |
| 54 | * exception, as handled by the wrs.nto helper. |
| 55 | */ |
| 56 | #ifndef CONFIG_USER_ONLY |
| 57 | gen_helper_wrs_nto(tcg_env); |
| 58 | #endif |
| 59 | |
| 60 | /* We only get here when helper_wrs_nto() doesn't raise an exception. */ |
| 61 | return trans_wrs_sto(ctx, NULL); |
| 62 | } |