This is based on v1.0 of the Zilsd extension [1]. The specification is listed as in the Ratified state [2], since Jan 30, 2025.
[1]: https://github.com/riscv/riscv-zilsd [2]: https://riscv.atlassian.net/wiki/spaces/HOME/pages/16154861/RISC-V+Specs+Under+Development Signed-off-by: Roan Richmond <[email protected]> --- target/riscv/cpu.c | 2 + target/riscv/cpu_cfg_fields.h.inc | 1 + target/riscv/insn_trans/trans_rvi.c.inc | 56 ++++++++++++++++++++++++- 3 files changed, 57 insertions(+), 2 deletions(-) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 73d4280d7c..6e0d37fb96 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -121,6 +121,7 @@ const RISCVIsaExtData isa_edata_arr[] = { ISA_EXT_DATA_ENTRY(zihintntl, PRIV_VERSION_1_10_0, ext_zihintntl), 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(zilsd, PRIV_VERSION_1_13_0, ext_zilsd), ISA_EXT_DATA_ENTRY(zimop, PRIV_VERSION_1_13_0, ext_zimop), ISA_EXT_DATA_ENTRY(zmmul, PRIV_VERSION_1_12_0, ext_zmmul), ISA_EXT_DATA_ENTRY(za64rs, PRIV_VERSION_1_12_0, has_priv_1_12), @@ -1247,6 +1248,7 @@ 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("zilsd", ext_zilsd, false), MULTI_EXT_CFG_BOOL("zimop", ext_zimop, false), MULTI_EXT_CFG_BOOL("zcmop", ext_zcmop, false), MULTI_EXT_CFG_BOOL("zacas", ext_zacas, false), diff --git a/target/riscv/cpu_cfg_fields.h.inc b/target/riscv/cpu_cfg_fields.h.inc index a154ecdc79..8d8e35e4cf 100644 --- a/target/riscv/cpu_cfg_fields.h.inc +++ b/target/riscv/cpu_cfg_fields.h.inc @@ -41,6 +41,7 @@ BOOL_FIELD(ext_zicond) BOOL_FIELD(ext_zihintntl) BOOL_FIELD(ext_zihintpause) BOOL_FIELD(ext_zihpm) +BOOL_FIELD(ext_zilsd) BOOL_FIELD(ext_zimop) BOOL_FIELD(ext_zcmop) BOOL_FIELD(ext_ztso) diff --git a/target/riscv/insn_trans/trans_rvi.c.inc b/target/riscv/insn_trans/trans_rvi.c.inc index 54b9b4f241..dcbb3811d9 100644 --- a/target/riscv/insn_trans/trans_rvi.c.inc +++ b/target/riscv/insn_trans/trans_rvi.c.inc @@ -370,6 +370,27 @@ static bool gen_load_tl(DisasContext *ctx, arg_lb *a, MemOp memop) return true; } +/* Zilsd extension adds load/store double for 32bit arch */ +static bool gen_load_zilsd(DisasContext *ctx, arg_lb *a) +{ + TCGv dest_1 = dest_gpr(ctx, a->rd); + TCGv dest_2 = dest_gpr(ctx, (a->rd)+1); + TCGv addr_1 = get_address(ctx, a->rs1, a->imm); + TCGv addr_2 = get_address(ctx, a->rs1, (a->imm)+4); + + tcg_gen_qemu_ld_tl(dest_1, addr_1, ctx->mem_idx, MO_SL); + tcg_gen_qemu_ld_tl(dest_2, addr_2, ctx->mem_idx, MO_SL); + + /* If destination is x0 then result of the load is discarded */ + if (a->rd == 0) { + return true; + } + + gen_set_gpr(ctx, a->rd, dest_1); + gen_set_gpr(ctx, a->rd+1, dest_2); + return true; +} + /* Compute only 64-bit addresses to use the address translation mechanism */ static bool gen_load_i128(DisasContext *ctx, arg_lb *a, MemOp memop) { @@ -409,6 +430,8 @@ static bool gen_load(DisasContext *ctx, arg_lb *a, MemOp memop) decode_save_opc(ctx, 0); if (get_xl(ctx) == MXL_RV128) { out = gen_load_i128(ctx, a, memop); + } else if (memop == MO_SQ && get_xl(ctx) == MXL_RV32) { + out = gen_load_zilsd(ctx, a); } else { out = gen_load_tl(ctx, a, memop); } @@ -437,7 +460,10 @@ static bool trans_lw(DisasContext *ctx, arg_lw *a) static bool trans_ld(DisasContext *ctx, arg_ld *a) { - REQUIRE_64_OR_128BIT(ctx); + /* Check for Zilsd extension if 32bit */ + if (get_xl(ctx) == MXL_RV32 && !ctx->cfg_ptr->ext_zilsd) { + return false; + } return gen_load(ctx, a, MO_SQ); } @@ -482,6 +508,27 @@ static bool gen_store_tl(DisasContext *ctx, arg_sb *a, MemOp memop) return true; } +/* Zilsd extension adds load/store double for 32bit arch */ +static bool gen_store_zilsd(DisasContext *ctx, arg_sb *a) +{ + TCGv data_1 = tcg_temp_new(); + TCGv data_2 = tcg_temp_new(); + if (a->rs2 != 0) { + data_1 = get_gpr(ctx, a->rs2, EXT_NONE); + data_2 = get_gpr(ctx, (a->rs2)+1, EXT_NONE); + } + TCGv addr_1 = get_address(ctx, a->rs1, a->imm); + TCGv addr_2 = get_address(ctx, a->rs1, (a->imm)+4); + + if (ctx->ztso) { + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL); + } + + tcg_gen_qemu_st_tl(data_1, addr_1, ctx->mem_idx, MO_SL); + tcg_gen_qemu_st_tl(data_2, addr_2, ctx->mem_idx, MO_SL); + return true; +} + static bool gen_store_i128(DisasContext *ctx, arg_sb *a, MemOp memop) { TCGv src1l = get_gpr(ctx, a->rs1, EXT_NONE); @@ -511,6 +558,8 @@ static bool gen_store(DisasContext *ctx, arg_sb *a, MemOp memop) decode_save_opc(ctx, 0); if (get_xl(ctx) == MXL_RV128) { return gen_store_i128(ctx, a, memop); + } else if (memop == MO_UQ && get_xl(ctx) == MXL_RV32) { + return gen_store_zilsd(ctx, a); } else { return gen_store_tl(ctx, a, memop); } @@ -533,7 +582,10 @@ static bool trans_sw(DisasContext *ctx, arg_sw *a) static bool trans_sd(DisasContext *ctx, arg_sd *a) { - REQUIRE_64_OR_128BIT(ctx); + /* Check for Zilsd extension if 32bit */ + if (get_xl(ctx) == MXL_RV32 && !ctx->cfg_ptr->ext_zilsd) { + return false; + } return gen_store(ctx, a, MO_UQ); } -- 2.43.0
