target/riscv/cpu.c | 1 + target/riscv/insn32.decode | 10 ++ target/riscv/insn_trans/trans_rvzalasr.c.inc | 120 +++++++++++++++++++ target/riscv/translate.c | 1 + 4 files changed, 132 insertions(+) create mode 100644 target/riscv/insn_trans/trans_rvzalasr.c.inc
This is based on version v0.8.3 of the ZALASR specification [1].
The specification is listed as in Frozen state [2].
[1]: https://github.com/riscv/riscv-zalasr/tree/v0.8.3
[2]: https://lf-riscv.atlassian.net/wiki/spaces/HOME/pages/16154882/All+RISC-V+Specifications+Under+Active+Development
Signed-off-by: Roan Richmond <roan.richmond@codethink.co.uk>
---
V3:
- rebased patch onto master branch
- added check for aq on Load Acquire, as pointed out by Alistair Palmer
- added check for rl on Store Release, as mentioned by Alistair Palmer
target/riscv/cpu.c | 1 +
target/riscv/insn32.decode | 10 ++
target/riscv/insn_trans/trans_rvzalasr.c.inc | 120 +++++++++++++++++++
target/riscv/translate.c | 1 +
4 files changed, 132 insertions(+)
create mode 100644 target/riscv/insn_trans/trans_rvzalasr.c.inc
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 629ac37501..b52bbf0936 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -128,6 +128,7 @@ const RISCVIsaExtData isa_edata_arr[] = {
ISA_EXT_DATA_ENTRY(zabha, PRIV_VERSION_1_13_0, ext_zabha),
ISA_EXT_DATA_ENTRY(zacas, PRIV_VERSION_1_12_0, ext_zacas),
ISA_EXT_DATA_ENTRY(zama16b, PRIV_VERSION_1_13_0, ext_zama16b),
+ ISA_EXT_DATA_ENTRY(zalasr, PRIV_VERSION_1_12_0, ext_zalasr),
ISA_EXT_DATA_ENTRY(zalrsc, PRIV_VERSION_1_12_0, ext_zalrsc),
ISA_EXT_DATA_ENTRY(zawrs, PRIV_VERSION_1_12_0, ext_zawrs),
ISA_EXT_DATA_ENTRY(zfa, PRIV_VERSION_1_12_0, ext_zfa),
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index cd23b1f3a9..c848c0c1c5 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -1066,3 +1066,13 @@ amominu_h 11000 . . ..... ..... 001 ..... 0101111 @atom_st
amomaxu_h 11100 . . ..... ..... 001 ..... 0101111 @atom_st
amocas_b 00101 . . ..... ..... 000 ..... 0101111 @atom_st
amocas_h 00101 . . ..... ..... 001 ..... 0101111 @atom_st
+
+# *** Zalasr Standard Extension ***
+lb_aqrl 00110 . . ..... ..... 000 ..... 0101111 @atom_st
+lh_aqrl 00110 . . ..... ..... 001 ..... 0101111 @atom_st
+lw_aqrl 00110 . . ..... ..... 010 ..... 0101111 @atom_st
+ld_aqrl 00110 . . ..... ..... 011 ..... 0101111 @atom_st
+sb_aqrl 00111 . . ..... ..... 000 ..... 0101111 @atom_st
+sh_aqrl 00111 . . ..... ..... 001 ..... 0101111 @atom_st
+sw_aqrl 00111 . . ..... ..... 010 ..... 0101111 @atom_st
+sd_aqrl 00111 . . ..... ..... 011 ..... 0101111 @atom_st
diff --git a/target/riscv/insn_trans/trans_rvzalasr.c.inc b/target/riscv/insn_trans/trans_rvzalasr.c.inc
new file mode 100644
index 0000000000..8761508de3
--- /dev/null
+++ b/target/riscv/insn_trans/trans_rvzalasr.c.inc
@@ -0,0 +1,120 @@
+/*
+ * RISC-V translation routines for the ZALASR (Load-Aquire and Store-Release)
+ * Extension.
+ *
+ * Copyright (c) 2025 Roan Richmond, roan.richmond@codethink.co.uk
+ *
+ * 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_ZALASR(ctx) do { \
+ if (!ctx->cfg_ptr->ext_zalasr) { \
+ return false; \
+ } \
+} while (0)
+
+static bool gen_load_acquire(DisasContext *ctx, arg_lb_aqrl *a, MemOp memop)
+{
+ decode_save_opc(ctx, 0);
+
+ TCGv addr = get_address(ctx, a->rs1, 0);
+ TCGv dest = get_gpr(ctx, a->rd, EXT_NONE);
+ TCGBar bar = (a->rl) ? TCG_BAR_STRL : 0;
+
+ /* Check that AQ is set, as this is mandatory */
+ if (!a->aq) {
+ return false;
+ }
+
+ memop |= (ctx->cfg_ptr->ext_zama16b) ? MO_ATOM_WITHIN16 : 0;
+
+ tcg_gen_qemu_ld_tl(dest, addr, ctx->mem_idx, memop);
+ gen_set_gpr(ctx, a->rd, dest);
+
+ /* Add a memory barrier implied by AQ (mandatory) and RL (optional) */
+ tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ | bar);
+
+ return true;
+}
+
+static bool trans_lb_aqrl(DisasContext *ctx, arg_lb_aqrl *a)
+{
+ REQUIRE_ZALASR(ctx);
+ return gen_load_acquire(ctx, a, (MO_ALIGN | MO_SB));
+}
+
+static bool trans_lh_aqrl(DisasContext *ctx, arg_lh_aqrl *a)
+{
+ REQUIRE_ZALASR(ctx);
+ return gen_load_acquire(ctx, a, (MO_ALIGN | MO_TESW));
+}
+
+static bool trans_lw_aqrl(DisasContext *ctx, arg_lw_aqrl *a)
+{
+ REQUIRE_ZALASR(ctx);
+ return gen_load_acquire(ctx, a, (MO_ALIGN | MO_TESL));
+}
+
+static bool trans_ld_aqrl(DisasContext *ctx, arg_ld_aqrl *a)
+{
+ REQUIRE_64BIT(ctx);
+ REQUIRE_ZALASR(ctx);
+ return gen_load_acquire(ctx, a, (MO_ALIGN | MO_TEUQ));
+}
+
+static bool gen_store_release(DisasContext *ctx, arg_sb_aqrl *a, MemOp memop)
+{
+ decode_save_opc(ctx, 0);
+
+ TCGv addr = get_address(ctx, a->rs1, 0);
+ TCGv data = get_gpr(ctx, a->rs2, EXT_NONE);
+ TCGBar bar = (a->aq) ? TCG_BAR_LDAQ : 0;
+
+ /* Check that RL is set, as this is mandatory */
+ if (!a->rl) {
+ return false;
+ }
+
+ memop |= (ctx->cfg_ptr->ext_zama16b) ? MO_ATOM_WITHIN16 : 0;
+
+ /* Add a memory barrier implied by RL (mandatory) and AQ (optional) */
+ tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL | bar);
+
+ tcg_gen_qemu_st_tl(data, addr, ctx->mem_idx, memop);
+ return true;
+}
+
+static bool trans_sb_aqrl(DisasContext *ctx, arg_sb_aqrl *a)
+{
+ REQUIRE_ZALASR(ctx);
+ return gen_store_release(ctx, a, (MO_ALIGN | MO_SB));
+}
+
+static bool trans_sh_aqrl(DisasContext *ctx, arg_sh_aqrl *a)
+{
+ REQUIRE_ZALASR(ctx);
+ return gen_store_release(ctx, a, (MO_ALIGN | MO_TESW));
+}
+
+static bool trans_sw_aqrl(DisasContext *ctx, arg_sw_aqrl *a)
+{
+ REQUIRE_ZALASR(ctx);
+ return gen_store_release(ctx, a, (MO_ALIGN | MO_TESL));
+}
+
+static bool trans_sd_aqrl(DisasContext *ctx, arg_sd_aqrl *a)
+{
+ REQUIRE_64BIT(ctx);
+ REQUIRE_ZALASR(ctx);
+ return gen_store_release(ctx, a, (MO_ALIGN | MO_TEUQ));
+}
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index d7a6de02df..4cd2d68e46 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -1183,6 +1183,7 @@ static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
#include "insn_trans/trans_rvzicond.c.inc"
#include "insn_trans/trans_rvzacas.c.inc"
#include "insn_trans/trans_rvzabha.c.inc"
+#include "insn_trans/trans_rvzalasr.c.inc"
#include "insn_trans/trans_rvzawrs.c.inc"
#include "insn_trans/trans_rvzicbo.c.inc"
#include "insn_trans/trans_rvzimop.c.inc"
--
2.43.0© 2016 - 2025 Red Hat, Inc.