1/*
2 * RISC-V translation routines for the RISC-V privileged instructions.
3 *
4 * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
5 * Copyright (c) 2018 Peer Adelt, peer.adelt@hni.uni-paderborn.de
6 *                    Bastian Koppelmann, kbastian@mail.uni-paderborn.de
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2 or later, as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program.  If not, see <http://www.gnu.org/licenses/>.
19 */
20
21static bool trans_ecall(DisasContext *ctx, arg_ecall *a)
22{
23    /* always generates U-level ECALL, fixed in do_interrupt handler */
24    generate_exception(ctx, RISCV_EXCP_U_ECALL);
25    exit_tb(ctx); /* no chaining */
26    ctx->base.is_jmp = DISAS_NORETURN;
27    return true;
28}
29
30static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a)
31{
32    generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
33    exit_tb(ctx); /* no chaining */
34    ctx->base.is_jmp = DISAS_NORETURN;
35    return true;
36}
37
38static bool trans_uret(DisasContext *ctx, arg_uret *a)
39{
40    return false;
41}
42
43static bool trans_sret(DisasContext *ctx, arg_sret *a)
44{
45#ifndef CONFIG_USER_ONLY
46    tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
47
48    if (has_ext(ctx, RVS)) {
49        gen_helper_sret(cpu_pc, cpu_env, cpu_pc);
50        exit_tb(ctx); /* no chaining */
51        ctx->base.is_jmp = DISAS_NORETURN;
52    } else {
53        return false;
54    }
55    return true;
56#else
57    return false;
58#endif
59}
60
61static bool trans_mret(DisasContext *ctx, arg_mret *a)
62{
63#ifndef CONFIG_USER_ONLY
64    tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
65    gen_helper_mret(cpu_pc, cpu_env, cpu_pc);
66    exit_tb(ctx); /* no chaining */
67    ctx->base.is_jmp = DISAS_NORETURN;
68    return true;
69#else
70    return false;
71#endif
72}
73
74static bool trans_wfi(DisasContext *ctx, arg_wfi *a)
75{
76#ifndef CONFIG_USER_ONLY
77    tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn);
78    gen_helper_wfi(cpu_env);
79    return true;
80#else
81    return false;
82#endif
83}
84
85static bool trans_sfence_vma(DisasContext *ctx, arg_sfence_vma *a)
86{
87#ifndef CONFIG_USER_ONLY
88    gen_helper_tlb_flush(cpu_env);
89    return true;
90#endif
91    return false;
92}
93
94static bool trans_sfence_vm(DisasContext *ctx, arg_sfence_vm *a)
95{
96    return false;
97}
98