From: Weiwei Li <liweiwei@iscas.ac.cn>
Add support for amocas.w/d/q instructions which are part of the ratified
Zacas extension: https://github.com/riscv/riscv-zacas
Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20231207153842.32401-2-rbradford@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
target/riscv/cpu_cfg.h | 1 +
target/riscv/insn32.decode | 6 +
target/riscv/cpu.c | 2 +
target/riscv/tcg/tcg-cpu.c | 5 +
target/riscv/translate.c | 1 +
target/riscv/insn_trans/trans_rvzacas.c.inc | 150 ++++++++++++++++++++
6 files changed, 165 insertions(+)
create mode 100644 target/riscv/insn_trans/trans_rvzacas.c.inc
diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
index f4605fb190..d516de4a44 100644
--- a/target/riscv/cpu_cfg.h
+++ b/target/riscv/cpu_cfg.h
@@ -77,6 +77,7 @@ struct RISCVCPUConfig {
bool ext_svnapot;
bool ext_svpbmt;
bool ext_zdinx;
+ bool ext_zacas;
bool ext_zawrs;
bool ext_zfa;
bool ext_zfbfmin;
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index 33597fe2bb..f22df04cfd 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -1004,3 +1004,9 @@ vgmul_vv 101000 1 ..... 10001 010 ..... 1110111 @r2_vm_1
vsm4k_vi 100001 1 ..... ..... 010 ..... 1110111 @r_vm_1
vsm4r_vv 101000 1 ..... 10000 010 ..... 1110111 @r2_vm_1
vsm4r_vs 101001 1 ..... 10000 010 ..... 1110111 @r2_vm_1
+
+# *** RV32 Zacas Standard Extension ***
+amocas_w 00101 . . ..... ..... 010 ..... 0101111 @atom_st
+amocas_d 00101 . . ..... ..... 011 ..... 0101111 @atom_st
+# *** RV64 Zacas Standard Extension ***
+amocas_q 00101 . . ..... ..... 100 ..... 0101111 @atom_st
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 53b82cc581..21b0eddf6f 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -87,6 +87,7 @@ const RISCVIsaExtData isa_edata_arr[] = {
ISA_EXT_DATA_ENTRY(zihintpause, PRIV_VERSION_1_10_0, ext_zihintpause),
ISA_EXT_DATA_ENTRY(zihpm, PRIV_VERSION_1_12_0, ext_zihpm),
ISA_EXT_DATA_ENTRY(zmmul, PRIV_VERSION_1_12_0, ext_zmmul),
+ ISA_EXT_DATA_ENTRY(zacas, PRIV_VERSION_1_12_0, ext_zacas),
ISA_EXT_DATA_ENTRY(zawrs, PRIV_VERSION_1_12_0, ext_zawrs),
ISA_EXT_DATA_ENTRY(zfa, PRIV_VERSION_1_12_0, ext_zfa),
ISA_EXT_DATA_ENTRY(zfbfmin, PRIV_VERSION_1_12_0, ext_zfbfmin),
@@ -1297,6 +1298,7 @@ const RISCVCPUMultiExtConfig riscv_cpu_extensions[] = {
MULTI_EXT_CFG_BOOL("zicsr", ext_zicsr, true),
MULTI_EXT_CFG_BOOL("zihintntl", ext_zihintntl, true),
MULTI_EXT_CFG_BOOL("zihintpause", ext_zihintpause, true),
+ MULTI_EXT_CFG_BOOL("zacas", ext_zacas, false),
MULTI_EXT_CFG_BOOL("zawrs", ext_zawrs, true),
MULTI_EXT_CFG_BOOL("zfa", ext_zfa, true),
MULTI_EXT_CFG_BOOL("zfh", ext_zfh, false),
diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
index 8a35683a34..29b5a88931 100644
--- a/target/riscv/tcg/tcg-cpu.c
+++ b/target/riscv/tcg/tcg-cpu.c
@@ -343,6 +343,11 @@ void riscv_cpu_validate_set_extensions(RISCVCPU *cpu, Error **errp)
return;
}
+ if ((cpu->cfg.ext_zacas) && !riscv_has_ext(env, RVA)) {
+ error_setg(errp, "Zacas extension requires A extension");
+ return;
+ }
+
if ((cpu->cfg.ext_zawrs) && !riscv_has_ext(env, RVA)) {
error_setg(errp, "Zawrs extension requires A extension");
return;
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index f0be79bb16..071fbad7ef 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -1089,6 +1089,7 @@ static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
#include "insn_trans/trans_rvv.c.inc"
#include "insn_trans/trans_rvb.c.inc"
#include "insn_trans/trans_rvzicond.c.inc"
+#include "insn_trans/trans_rvzacas.c.inc"
#include "insn_trans/trans_rvzawrs.c.inc"
#include "insn_trans/trans_rvzicbo.c.inc"
#include "insn_trans/trans_rvzfa.c.inc"
diff --git a/target/riscv/insn_trans/trans_rvzacas.c.inc b/target/riscv/insn_trans/trans_rvzacas.c.inc
new file mode 100644
index 0000000000..5d274d4c08
--- /dev/null
+++ b/target/riscv/insn_trans/trans_rvzacas.c.inc
@@ -0,0 +1,150 @@
+/*
+ * RISC-V translation routines for the RV64 Zacas Standard Extension.
+ *
+ * Copyright (c) 2020-2023 PLCT Lab
+ *
+ * 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/>.
+ */
+
+#define REQUIRE_ZACAS(ctx) do { \
+ if (!ctx->cfg_ptr->ext_zacas) { \
+ return false; \
+ } \
+} while (0)
+
+static bool gen_cmpxchg(DisasContext *ctx, arg_atomic *a, MemOp mop)
+{
+ TCGv dest = get_gpr(ctx, a->rd, EXT_NONE);
+ TCGv src1 = get_address(ctx, a->rs1, 0);
+ TCGv src2 = get_gpr(ctx, a->rs2, EXT_NONE);
+
+ decode_save_opc(ctx);
+ tcg_gen_atomic_cmpxchg_tl(dest, src1, dest, src2, ctx->mem_idx, mop);
+
+ gen_set_gpr(ctx, a->rd, dest);
+ return true;
+}
+
+static bool trans_amocas_w(DisasContext *ctx, arg_amocas_w *a)
+{
+ REQUIRE_ZACAS(ctx);
+ return gen_cmpxchg(ctx, a, MO_ALIGN | MO_TESL);
+}
+
+static TCGv_i64 get_gpr_pair(DisasContext *ctx, int reg_num)
+{
+ TCGv_i64 t;
+
+ assert(get_ol(ctx) == MXL_RV32);
+
+ if (reg_num == 0) {
+ return tcg_constant_i64(0);
+ }
+
+ t = tcg_temp_new_i64();
+ tcg_gen_concat_tl_i64(t, cpu_gpr[reg_num], cpu_gpr[reg_num + 1]);
+ return t;
+}
+
+static void gen_set_gpr_pair(DisasContext *ctx, int reg_num, TCGv_i64 t)
+{
+ assert(get_ol(ctx) == MXL_RV32);
+
+ if (reg_num != 0) {
+#ifdef TARGET_RISCV32
+ tcg_gen_extr_i64_i32(cpu_gpr[reg_num], cpu_gpr[reg_num + 1], t);
+#else
+ tcg_gen_ext32s_i64(cpu_gpr[reg_num], t);
+ tcg_gen_sari_i64(cpu_gpr[reg_num + 1], t, 32);
+#endif
+
+ if (get_xl_max(ctx) == MXL_RV128) {
+ tcg_gen_sari_tl(cpu_gprh[reg_num], cpu_gpr[reg_num], 63);
+ tcg_gen_sari_tl(cpu_gprh[reg_num + 1], cpu_gpr[reg_num + 1], 63);
+ }
+ }
+}
+
+static bool gen_cmpxchg64(DisasContext *ctx, arg_atomic *a, MemOp mop)
+{
+ /*
+ * Encodings with odd numbered registers specified in rs2 and rd are
+ * reserved.
+ */
+ if ((a->rs2 | a->rd) & 1) {
+ return false;
+ }
+
+ TCGv_i64 dest = get_gpr_pair(ctx, a->rd);
+ TCGv src1 = get_address(ctx, a->rs1, 0);
+ TCGv_i64 src2 = get_gpr_pair(ctx, a->rs2);
+
+ decode_save_opc(ctx);
+ tcg_gen_atomic_cmpxchg_i64(dest, src1, dest, src2, ctx->mem_idx, mop);
+
+ gen_set_gpr_pair(ctx, a->rd, dest);
+ return true;
+}
+
+static bool trans_amocas_d(DisasContext *ctx, arg_amocas_d *a)
+{
+ REQUIRE_ZACAS(ctx);
+ switch (get_ol(ctx)) {
+ case MXL_RV32:
+ return gen_cmpxchg64(ctx, a, MO_ALIGN | MO_TEUQ);
+ case MXL_RV64:
+ case MXL_RV128:
+ return gen_cmpxchg(ctx, a, MO_ALIGN | MO_TEUQ);
+ default:
+ g_assert_not_reached();
+ }
+}
+
+static bool trans_amocas_q(DisasContext *ctx, arg_amocas_q *a)
+{
+ REQUIRE_ZACAS(ctx);
+ REQUIRE_64BIT(ctx);
+
+ /*
+ * Encodings with odd numbered registers specified in rs2 and rd are
+ * reserved.
+ */
+ if ((a->rs2 | a->rd) & 1) {
+ return false;
+ }
+
+#ifdef TARGET_RISCV64
+ TCGv_i128 dest = tcg_temp_new_i128();
+ TCGv src1 = get_address(ctx, a->rs1, 0);
+ TCGv_i128 src2 = tcg_temp_new_i128();
+ TCGv_i64 src2l = get_gpr(ctx, a->rs2, EXT_NONE);
+ TCGv_i64 src2h = get_gpr(ctx, a->rs2 == 0 ? 0 : a->rs2 + 1, EXT_NONE);
+ TCGv_i64 destl = get_gpr(ctx, a->rd, EXT_NONE);
+ TCGv_i64 desth = get_gpr(ctx, a->rd == 0 ? 0 : a->rd + 1, EXT_NONE);
+
+ tcg_gen_concat_i64_i128(src2, src2l, src2h);
+ tcg_gen_concat_i64_i128(dest, destl, desth);
+ decode_save_opc(ctx);
+ tcg_gen_atomic_cmpxchg_i128(dest, src1, dest, src2, ctx->mem_idx,
+ (MO_ALIGN | MO_TEUO));
+
+ tcg_gen_extr_i128_i64(destl, desth, dest);
+
+ if (a->rd != 0) {
+ gen_set_gpr(ctx, a->rd, destl);
+ gen_set_gpr(ctx, a->rd + 1, desth);
+ }
+#endif
+
+ return true;
+}
--
2.43.0