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/*
* RISC-V translation routines for the RISC-V privileged instructions.
*
* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
* Copyright (c) 2018 Peer Adelt, peer.adelt@hni.uni-paderborn.de
* Bastian Koppelmann, kbastian@mail.uni-paderborn.de
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
static bool trans_ecall(DisasContext *ctx, arg_ecall *a)
{
/* always generates U-level ECALL, fixed in do_interrupt handler */
generate_exception(ctx, RISCV_EXCP_U_ECALL);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
return true;
}
static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a)
{
generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
return true;
}
static bool trans_uret(DisasContext *ctx, arg_uret *a)
{
return false;
}
static bool trans_sret(DisasContext *ctx, arg_sret *a)
{
#ifndef CONFIG_USER_ONLY
tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
if (has_ext(ctx, RVS)) {
gen_helper_sret(cpu_pc, cpu_env, cpu_pc);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
} else {
return false;
}
return true;
#else
return false;
#endif
}
static bool trans_hret(DisasContext *ctx, arg_hret *a)
{
return false;
}
static bool trans_mret(DisasContext *ctx, arg_mret *a)
{
#ifndef CONFIG_USER_ONLY
tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
gen_helper_mret(cpu_pc, cpu_env, cpu_pc);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
return true;
#else
return false;
#endif
}
static bool trans_wfi(DisasContext *ctx, arg_wfi *a)
{
#ifndef CONFIG_USER_ONLY
tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn);
gen_helper_wfi(cpu_env);
return true;
#else
return false;
#endif
}
static bool trans_sfence_vma(DisasContext *ctx, arg_sfence_vma *a)
{
#ifndef CONFIG_USER_ONLY
if (ctx->priv_ver == PRIV_VERSION_1_10_0) {
gen_helper_tlb_flush(cpu_env);
return true;
}
#endif
return false;
}
static bool trans_sfence_vm(DisasContext *ctx, arg_sfence_vm *a)
{
#ifndef CONFIG_USER_ONLY
if (ctx->priv_ver <= PRIV_VERSION_1_09_1) {
gen_helper_tlb_flush(cpu_env);
return true;
}
#endif
return false;
}
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