blob: d04ca0394cfae56c6b8c9ead81589dd97e88c4c9 [file] [log] [blame]
/*
* RISC-V translation routines for the RVXI Base Integer Instruction Set.
*
* 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_illegal(DisasContext *ctx, arg_empty *a)
{
gen_exception_illegal(ctx);
return true;
}
static bool trans_lui(DisasContext *ctx, arg_lui *a)
{
if (a->rd != 0) {
tcg_gen_movi_tl(cpu_gpr[a->rd], a->imm);
}
return true;
}
static bool trans_auipc(DisasContext *ctx, arg_auipc *a)
{
if (a->rd != 0) {
tcg_gen_movi_tl(cpu_gpr[a->rd], a->imm + ctx->base.pc_next);
}
return true;
}
static bool trans_jal(DisasContext *ctx, arg_jal *a)
{
gen_jal(ctx, a->rd, a->imm);
return true;
}
static bool trans_jalr(DisasContext *ctx, arg_jalr *a)
{
/* no chaining with JALR */
TCGLabel *misaligned = NULL;
TCGv t0 = tcg_temp_new();
gen_get_gpr(cpu_pc, a->rs1);
tcg_gen_addi_tl(cpu_pc, cpu_pc, a->imm);
tcg_gen_andi_tl(cpu_pc, cpu_pc, (target_ulong)-2);
if (!has_ext(ctx, RVC)) {
misaligned = gen_new_label();
tcg_gen_andi_tl(t0, cpu_pc, 0x2);
tcg_gen_brcondi_tl(TCG_COND_NE, t0, 0x0, misaligned);
}
if (a->rd != 0) {
tcg_gen_movi_tl(cpu_gpr[a->rd], ctx->pc_succ_insn);
}
lookup_and_goto_ptr(ctx);
if (misaligned) {
gen_set_label(misaligned);
gen_exception_inst_addr_mis(ctx);
}
ctx->base.is_jmp = DISAS_NORETURN;
tcg_temp_free(t0);
return true;
}
static bool gen_branch(DisasContext *ctx, arg_b *a, TCGCond cond)
{
TCGLabel *l = gen_new_label();
TCGv source1, source2;
source1 = tcg_temp_new();
source2 = tcg_temp_new();
gen_get_gpr(source1, a->rs1);
gen_get_gpr(source2, a->rs2);
tcg_gen_brcond_tl(cond, source1, source2, l);
gen_goto_tb(ctx, 1, ctx->pc_succ_insn);
gen_set_label(l); /* branch taken */
if (!has_ext(ctx, RVC) && ((ctx->base.pc_next + a->imm) & 0x3)) {
/* misaligned */
gen_exception_inst_addr_mis(ctx);
} else {
gen_goto_tb(ctx, 0, ctx->base.pc_next + a->imm);
}
ctx->base.is_jmp = DISAS_NORETURN;
tcg_temp_free(source1);
tcg_temp_free(source2);
return true;
}
static bool trans_beq(DisasContext *ctx, arg_beq *a)
{
return gen_branch(ctx, a, TCG_COND_EQ);
}
static bool trans_bne(DisasContext *ctx, arg_bne *a)
{
return gen_branch(ctx, a, TCG_COND_NE);
}
static bool trans_blt(DisasContext *ctx, arg_blt *a)
{
return gen_branch(ctx, a, TCG_COND_LT);
}
static bool trans_bge(DisasContext *ctx, arg_bge *a)
{
return gen_branch(ctx, a, TCG_COND_GE);
}
static bool trans_bltu(DisasContext *ctx, arg_bltu *a)
{
return gen_branch(ctx, a, TCG_COND_LTU);
}
static bool trans_bgeu(DisasContext *ctx, arg_bgeu *a)
{
return gen_branch(ctx, a, TCG_COND_GEU);
}
static bool gen_load(DisasContext *ctx, arg_lb *a, MemOp memop)
{
TCGv t0 = tcg_temp_new();
TCGv t1 = tcg_temp_new();
gen_get_gpr(t0, a->rs1);
tcg_gen_addi_tl(t0, t0, a->imm);
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, memop);
gen_set_gpr(a->rd, t1);
tcg_temp_free(t0);
tcg_temp_free(t1);
return true;
}
static bool trans_lb(DisasContext *ctx, arg_lb *a)
{
return gen_load(ctx, a, MO_SB);
}
static bool trans_lh(DisasContext *ctx, arg_lh *a)
{
return gen_load(ctx, a, MO_TESW);
}
static bool trans_lw(DisasContext *ctx, arg_lw *a)
{
return gen_load(ctx, a, MO_TESL);
}
static bool trans_lbu(DisasContext *ctx, arg_lbu *a)
{
return gen_load(ctx, a, MO_UB);
}
static bool trans_lhu(DisasContext *ctx, arg_lhu *a)
{
return gen_load(ctx, a, MO_TEUW);
}
static bool gen_store(DisasContext *ctx, arg_sb *a, MemOp memop)
{
TCGv t0 = tcg_temp_new();
TCGv dat = tcg_temp_new();
gen_get_gpr(t0, a->rs1);
tcg_gen_addi_tl(t0, t0, a->imm);
gen_get_gpr(dat, a->rs2);
tcg_gen_qemu_st_tl(dat, t0, ctx->mem_idx, memop);
tcg_temp_free(t0);
tcg_temp_free(dat);
return true;
}
static bool trans_sb(DisasContext *ctx, arg_sb *a)
{
return gen_store(ctx, a, MO_SB);
}
static bool trans_sh(DisasContext *ctx, arg_sh *a)
{
return gen_store(ctx, a, MO_TESW);
}
static bool trans_sw(DisasContext *ctx, arg_sw *a)
{
return gen_store(ctx, a, MO_TESL);
}
#ifdef TARGET_RISCV64
static bool trans_lwu(DisasContext *ctx, arg_lwu *a)
{
return gen_load(ctx, a, MO_TEUL);
}
static bool trans_ld(DisasContext *ctx, arg_ld *a)
{
return gen_load(ctx, a, MO_TEQ);
}
static bool trans_sd(DisasContext *ctx, arg_sd *a)
{
return gen_store(ctx, a, MO_TEQ);
}
#endif
static bool trans_addi(DisasContext *ctx, arg_addi *a)
{
return gen_arith_imm_fn(ctx, a, &tcg_gen_addi_tl);
}
static void gen_slt(TCGv ret, TCGv s1, TCGv s2)
{
tcg_gen_setcond_tl(TCG_COND_LT, ret, s1, s2);
}
static void gen_sltu(TCGv ret, TCGv s1, TCGv s2)
{
tcg_gen_setcond_tl(TCG_COND_LTU, ret, s1, s2);
}
static bool trans_slti(DisasContext *ctx, arg_slti *a)
{
return gen_arith_imm_tl(ctx, a, &gen_slt);
}
static bool trans_sltiu(DisasContext *ctx, arg_sltiu *a)
{
return gen_arith_imm_tl(ctx, a, &gen_sltu);
}
static bool trans_xori(DisasContext *ctx, arg_xori *a)
{
return gen_arith_imm_fn(ctx, a, &tcg_gen_xori_tl);
}
static bool trans_ori(DisasContext *ctx, arg_ori *a)
{
return gen_arith_imm_fn(ctx, a, &tcg_gen_ori_tl);
}
static bool trans_andi(DisasContext *ctx, arg_andi *a)
{
return gen_arith_imm_fn(ctx, a, &tcg_gen_andi_tl);
}
static bool trans_slli(DisasContext *ctx, arg_slli *a)
{
if (a->shamt >= TARGET_LONG_BITS) {
return false;
}
if (a->rd != 0) {
TCGv t = tcg_temp_new();
gen_get_gpr(t, a->rs1);
tcg_gen_shli_tl(t, t, a->shamt);
gen_set_gpr(a->rd, t);
tcg_temp_free(t);
} /* NOP otherwise */
return true;
}
static bool trans_srli(DisasContext *ctx, arg_srli *a)
{
if (a->shamt >= TARGET_LONG_BITS) {
return false;
}
if (a->rd != 0) {
TCGv t = tcg_temp_new();
gen_get_gpr(t, a->rs1);
tcg_gen_shri_tl(t, t, a->shamt);
gen_set_gpr(a->rd, t);
tcg_temp_free(t);
} /* NOP otherwise */
return true;
}
static bool trans_srai(DisasContext *ctx, arg_srai *a)
{
if (a->shamt >= TARGET_LONG_BITS) {
return false;
}
if (a->rd != 0) {
TCGv t = tcg_temp_new();
gen_get_gpr(t, a->rs1);
tcg_gen_sari_tl(t, t, a->shamt);
gen_set_gpr(a->rd, t);
tcg_temp_free(t);
} /* NOP otherwise */
return true;
}
static bool trans_add(DisasContext *ctx, arg_add *a)
{
return gen_arith(ctx, a, &tcg_gen_add_tl);
}
static bool trans_sub(DisasContext *ctx, arg_sub *a)
{
return gen_arith(ctx, a, &tcg_gen_sub_tl);
}
static bool trans_sll(DisasContext *ctx, arg_sll *a)
{
return gen_shift(ctx, a, &tcg_gen_shl_tl);
}
static bool trans_slt(DisasContext *ctx, arg_slt *a)
{
return gen_arith(ctx, a, &gen_slt);
}
static bool trans_sltu(DisasContext *ctx, arg_sltu *a)
{
return gen_arith(ctx, a, &gen_sltu);
}
static bool trans_xor(DisasContext *ctx, arg_xor *a)
{
return gen_arith(ctx, a, &tcg_gen_xor_tl);
}
static bool trans_srl(DisasContext *ctx, arg_srl *a)
{
return gen_shift(ctx, a, &tcg_gen_shr_tl);
}
static bool trans_sra(DisasContext *ctx, arg_sra *a)
{
return gen_shift(ctx, a, &tcg_gen_sar_tl);
}
static bool trans_or(DisasContext *ctx, arg_or *a)
{
return gen_arith(ctx, a, &tcg_gen_or_tl);
}
static bool trans_and(DisasContext *ctx, arg_and *a)
{
return gen_arith(ctx, a, &tcg_gen_and_tl);
}
#ifdef TARGET_RISCV64
static bool trans_addiw(DisasContext *ctx, arg_addiw *a)
{
return gen_arith_imm_tl(ctx, a, &gen_addw);
}
static bool trans_slliw(DisasContext *ctx, arg_slliw *a)
{
TCGv source1;
source1 = tcg_temp_new();
gen_get_gpr(source1, a->rs1);
tcg_gen_shli_tl(source1, source1, a->shamt);
tcg_gen_ext32s_tl(source1, source1);
gen_set_gpr(a->rd, source1);
tcg_temp_free(source1);
return true;
}
static bool trans_srliw(DisasContext *ctx, arg_srliw *a)
{
TCGv t = tcg_temp_new();
gen_get_gpr(t, a->rs1);
tcg_gen_extract_tl(t, t, a->shamt, 32 - a->shamt);
/* sign-extend for W instructions */
tcg_gen_ext32s_tl(t, t);
gen_set_gpr(a->rd, t);
tcg_temp_free(t);
return true;
}
static bool trans_sraiw(DisasContext *ctx, arg_sraiw *a)
{
TCGv t = tcg_temp_new();
gen_get_gpr(t, a->rs1);
tcg_gen_sextract_tl(t, t, a->shamt, 32 - a->shamt);
gen_set_gpr(a->rd, t);
tcg_temp_free(t);
return true;
}
static bool trans_addw(DisasContext *ctx, arg_addw *a)
{
return gen_arith(ctx, a, &gen_addw);
}
static bool trans_subw(DisasContext *ctx, arg_subw *a)
{
return gen_arith(ctx, a, &gen_subw);
}
static bool trans_sllw(DisasContext *ctx, arg_sllw *a)
{
TCGv source1 = tcg_temp_new();
TCGv source2 = tcg_temp_new();
gen_get_gpr(source1, a->rs1);
gen_get_gpr(source2, a->rs2);
tcg_gen_andi_tl(source2, source2, 0x1F);
tcg_gen_shl_tl(source1, source1, source2);
tcg_gen_ext32s_tl(source1, source1);
gen_set_gpr(a->rd, source1);
tcg_temp_free(source1);
tcg_temp_free(source2);
return true;
}
static bool trans_srlw(DisasContext *ctx, arg_srlw *a)
{
TCGv source1 = tcg_temp_new();
TCGv source2 = tcg_temp_new();
gen_get_gpr(source1, a->rs1);
gen_get_gpr(source2, a->rs2);
/* clear upper 32 */
tcg_gen_ext32u_tl(source1, source1);
tcg_gen_andi_tl(source2, source2, 0x1F);
tcg_gen_shr_tl(source1, source1, source2);
tcg_gen_ext32s_tl(source1, source1);
gen_set_gpr(a->rd, source1);
tcg_temp_free(source1);
tcg_temp_free(source2);
return true;
}
static bool trans_sraw(DisasContext *ctx, arg_sraw *a)
{
TCGv source1 = tcg_temp_new();
TCGv source2 = tcg_temp_new();
gen_get_gpr(source1, a->rs1);
gen_get_gpr(source2, a->rs2);
/*
* first, trick to get it to act like working on 32 bits (get rid of
* upper 32, sign extend to fill space)
*/
tcg_gen_ext32s_tl(source1, source1);
tcg_gen_andi_tl(source2, source2, 0x1F);
tcg_gen_sar_tl(source1, source1, source2);
gen_set_gpr(a->rd, source1);
tcg_temp_free(source1);
tcg_temp_free(source2);
return true;
}
#endif
static bool trans_fence(DisasContext *ctx, arg_fence *a)
{
/* FENCE is a full memory barrier. */
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC);
return true;
}
static bool trans_fence_i(DisasContext *ctx, arg_fence_i *a)
{
if (!ctx->ext_ifencei) {
return false;
}
/*
* FENCE_I is a no-op in QEMU,
* however we need to end the translation block
*/
tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn);
exit_tb(ctx);
ctx->base.is_jmp = DISAS_NORETURN;
return true;
}
#define RISCV_OP_CSR_PRE do {\
source1 = tcg_temp_new(); \
csr_store = tcg_temp_new(); \
dest = tcg_temp_new(); \
rs1_pass = tcg_temp_new(); \
gen_get_gpr(source1, a->rs1); \
tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next); \
tcg_gen_movi_tl(rs1_pass, a->rs1); \
tcg_gen_movi_tl(csr_store, a->csr); \
gen_io_start();\
} while (0)
#define RISCV_OP_CSR_POST do {\
gen_set_gpr(a->rd, dest); \
tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn); \
exit_tb(ctx); \
ctx->base.is_jmp = DISAS_NORETURN; \
tcg_temp_free(source1); \
tcg_temp_free(csr_store); \
tcg_temp_free(dest); \
tcg_temp_free(rs1_pass); \
} while (0)
static bool trans_csrrw(DisasContext *ctx, arg_csrrw *a)
{
TCGv source1, csr_store, dest, rs1_pass;
RISCV_OP_CSR_PRE;
gen_helper_csrrw(dest, cpu_env, source1, csr_store);
RISCV_OP_CSR_POST;
return true;
}
static bool trans_csrrs(DisasContext *ctx, arg_csrrs *a)
{
TCGv source1, csr_store, dest, rs1_pass;
RISCV_OP_CSR_PRE;
gen_helper_csrrs(dest, cpu_env, source1, csr_store, rs1_pass);
RISCV_OP_CSR_POST;
return true;
}
static bool trans_csrrc(DisasContext *ctx, arg_csrrc *a)
{
TCGv source1, csr_store, dest, rs1_pass;
RISCV_OP_CSR_PRE;
gen_helper_csrrc(dest, cpu_env, source1, csr_store, rs1_pass);
RISCV_OP_CSR_POST;
return true;
}
static bool trans_csrrwi(DisasContext *ctx, arg_csrrwi *a)
{
TCGv source1, csr_store, dest, rs1_pass;
RISCV_OP_CSR_PRE;
gen_helper_csrrw(dest, cpu_env, rs1_pass, csr_store);
RISCV_OP_CSR_POST;
return true;
}
static bool trans_csrrsi(DisasContext *ctx, arg_csrrsi *a)
{
TCGv source1, csr_store, dest, rs1_pass;
RISCV_OP_CSR_PRE;
gen_helper_csrrs(dest, cpu_env, rs1_pass, csr_store, rs1_pass);
RISCV_OP_CSR_POST;
return true;
}
static bool trans_csrrci(DisasContext *ctx, arg_csrrci *a)
{
TCGv source1, csr_store, dest, rs1_pass;
RISCV_OP_CSR_PRE;
gen_helper_csrrc(dest, cpu_env, rs1_pass, csr_store, rs1_pass);
RISCV_OP_CSR_POST;
return true;
}