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[PATCH v4 08/17] target/riscv: accessors to registers upper part and 128
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From: |
Frédéric Pétrot |
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Subject: |
[PATCH v4 08/17] target/riscv: accessors to registers upper part and 128-bit load/store |
|
Date: |
Mon, 25 Oct 2021 14:28:09 +0200 |
Get function to retrieve the 64 top bits of a register, stored in the gprh
field of the cpu state. Set function that writes the 128-bit value at once.
The access to the gprh field can not be protected at compile time to make
sure it is accessed only in the 128-bit version of the processor because we
have no way to indicate that the misa_mxl_max field is const.
The 128-bit ISA adds ldu, lq and sq. We provide support for these
instructions. Note that we compte only 64-bit addresses to actually access
memory, cowardly utilizing the existing address translation mechanism of
QEMU.
Signed-off-by: Frédéric Pétrot <frederic.petrot@univ-grenoble-alpes.fr>
Co-authored-by: Fabien Portas <fabien.portas@grenoble-inp.org>
---
configs/targets/riscv128-softmmu.mak | 3 +-
target/riscv/insn16.decode | 27 +++++-
target/riscv/insn32.decode | 5 ++
target/riscv/translate.c | 43 +++++++++
target/riscv/insn_trans/trans_rvi.c.inc | 112 ++++++++++++++++++++++--
5 files changed, 178 insertions(+), 12 deletions(-)
diff --git a/configs/targets/riscv128-softmmu.mak
b/configs/targets/riscv128-softmmu.mak
index a9343d57d3..41daab1cd3 100644
--- a/configs/targets/riscv128-softmmu.mak
+++ b/configs/targets/riscv128-softmmu.mak
@@ -1,5 +1,6 @@
TARGET_ARCH=riscv128
TARGET_BASE_ARCH=riscv
-TARGET_SUPPORTS_MTTCG=y
+# As long as we have no atomic accesses for aligned 128-bit addresses
+TARGET_SUPPORTS_MTTCG=n
TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml
gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-virtual.xml
TARGET_NEED_FDT=y
diff --git a/target/riscv/insn16.decode b/target/riscv/insn16.decode
index 2e9212663c..02c8f61b48 100644
--- a/target/riscv/insn16.decode
+++ b/target/riscv/insn16.decode
@@ -25,14 +25,17 @@
# Immediates:
%imm_ci 12:s1 2:5
%nzuimm_ciw 7:4 11:2 5:1 6:1 !function=ex_shift_2
+%uimm_cl_q 10:1 5:2 11:2 !function=ex_shift_4
%uimm_cl_d 5:2 10:3 !function=ex_shift_3
%uimm_cl_w 5:1 10:3 6:1 !function=ex_shift_2
%imm_cb 12:s1 5:2 2:1 10:2 3:2 !function=ex_shift_1
%imm_cj 12:s1 8:1 9:2 6:1 7:1 2:1 11:1 3:3 !function=ex_shift_1
%shimm_6bit 12:1 2:5 !function=ex_rvc_shifti
+%uimm_6bit_lq 2:4 12:1 6:1 !function=ex_shift_4
%uimm_6bit_ld 2:3 12:1 5:2 !function=ex_shift_3
%uimm_6bit_lw 2:2 12:1 4:3 !function=ex_shift_2
+%uimm_6bit_sq 7:4 11:2 !function=ex_shift_4
%uimm_6bit_sd 7:3 10:3 !function=ex_shift_3
%uimm_6bit_sw 7:2 9:4 !function=ex_shift_2
@@ -54,16 +57,20 @@
# Formats 16:
@cr .... ..... ..... .. &r rs2=%rs2_5 rs1=%rd %rd
@ci ... . ..... ..... .. &i imm=%imm_ci rs1=%rd %rd
+@cl_q ... . ..... ..... .. &i imm=%uimm_cl_q rs1=%rs1_3 rd=%rs2_3
@cl_d ... ... ... .. ... .. &i imm=%uimm_cl_d rs1=%rs1_3 rd=%rs2_3
@cl_w ... ... ... .. ... .. &i imm=%uimm_cl_w rs1=%rs1_3 rd=%rs2_3
@cs_2 ... ... ... .. ... .. &r rs2=%rs2_3 rs1=%rs1_3 rd=%rs1_3
+@cs_q ... ... ... .. ... .. &s imm=%uimm_cl_q rs1=%rs1_3
rs2=%rs2_3
@cs_d ... ... ... .. ... .. &s imm=%uimm_cl_d rs1=%rs1_3
rs2=%rs2_3
@cs_w ... ... ... .. ... .. &s imm=%uimm_cl_w rs1=%rs1_3
rs2=%rs2_3
@cj ... ........... .. &j imm=%imm_cj
@cb_z ... ... ... .. ... .. &b imm=%imm_cb rs1=%rs1_3 rs2=0
+@c_lqsp ... . ..... ..... .. &i imm=%uimm_6bit_lq rs1=2 %rd
@c_ldsp ... . ..... ..... .. &i imm=%uimm_6bit_ld rs1=2 %rd
@c_lwsp ... . ..... ..... .. &i imm=%uimm_6bit_lw rs1=2 %rd
+@c_sqsp ... . ..... ..... .. &s imm=%uimm_6bit_sq rs1=2 rs2=%rs2_5
@c_sdsp ... . ..... ..... .. &s imm=%uimm_6bit_sd rs1=2 rs2=%rs2_5
@c_swsp ... . ..... ..... .. &s imm=%uimm_6bit_sw rs1=2 rs2=%rs2_5
@c_li ... . ..... ..... .. &i imm=%imm_ci rs1=0 %rd
@@ -87,9 +94,15 @@
illegal 000 000 000 00 --- 00
addi 000 ... ... .. ... 00 @c_addi4spn
}
-fld 001 ... ... .. ... 00 @cl_d
+{
+ lq 001 ... ... .. ... 00 @cl_q
+ fld 001 ... ... .. ... 00 @cl_d
+}
lw 010 ... ... .. ... 00 @cl_w
-fsd 101 ... ... .. ... 00 @cs_d
+{
+ sq 101 ... ... .. ... 00 @cs_q
+ fsd 101 ... ... .. ... 00 @cs_d
+}
sw 110 ... ... .. ... 00 @cs_w
# *** RV32C and RV64C specific Standard Extension (Quadrant 0) ***
@@ -132,7 +145,10 @@ addw 100 1 11 ... 01 ... 01 @cs_2
# *** RV32/64C Standard Extension (Quadrant 2) ***
slli 000 . ..... ..... 10 @c_shift2
-fld 001 . ..... ..... 10 @c_ldsp
+{
+ lq 001 ... ... .. ... 10 @c_lqsp
+ fld 001 . ..... ..... 10 @c_ldsp
+}
{
illegal 010 - 00000 ----- 10 # c.lwsp, RES rd=0
lw 010 . ..... ..... 10 @c_lwsp
@@ -147,7 +163,10 @@ fld 001 . ..... ..... 10 @c_ldsp
jalr 100 1 ..... 00000 10 @c_jalr rd=1 # C.JALR
add 100 1 ..... ..... 10 @cr
}
-fsd 101 ...... ..... 10 @c_sdsp
+{
+ sq 101 ... ... .. ... 10 @c_sqsp
+ fsd 101 ...... ..... 10 @c_sdsp
+}
sw 110 . ..... ..... 10 @c_swsp
# *** RV32C and RV64C specific Standard Extension (Quadrant 2) ***
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index 2f251dac1b..02889c6082 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -163,6 +163,11 @@ sllw 0000000 ..... ..... 001 ..... 0111011 @r
srlw 0000000 ..... ..... 101 ..... 0111011 @r
sraw 0100000 ..... ..... 101 ..... 0111011 @r
+# *** RV128I Base Instruction Set (in addition to RV64I) ***
+ldu ............ ..... 111 ..... 0000011 @i
+lq ............ ..... 010 ..... 0001111 @i
+sq ............ ..... 100 ..... 0100011 @s
+
# *** RV32M Standard Extension ***
mul 0000001 ..... ..... 000 ..... 0110011 @r
mulh 0000001 ..... ..... 001 ..... 0110011 @r
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 63a52bb707..070db77ca5 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -55,6 +55,7 @@ typedef struct DisasContext {
/* pc_succ_insn points to the instruction following base.pc_next */
target_ulong pc_succ_insn;
target_ulong priv_ver;
+ RISCVMXL misa_mxl_max;
RISCVMXL xl;
uint32_t misa_ext;
uint32_t opcode;
@@ -116,6 +117,13 @@ static inline int get_olen(DisasContext *ctx)
return 16 << get_ol(ctx);
}
+/* The maximum register length */
+#ifdef TARGET_RISCV32
+#define get_xl_max(ctx) MXL_RV32
+#else
+#define get_xl_max(ctx) ((ctx)->misa_mxl_max)
+#endif
+
/*
* RISC-V requires NaN-boxing of narrower width floating point values.
* This applies when a 32-bit value is assigned to a 64-bit FP register.
@@ -220,6 +228,7 @@ static TCGv get_gpr(DisasContext *ctx, int reg_num,
DisasExtend ext)
}
break;
case MXL_RV64:
+ case MXL_RV128:
break;
default:
g_assert_not_reached();
@@ -227,6 +236,15 @@ static TCGv get_gpr(DisasContext *ctx, int reg_num,
DisasExtend ext)
return cpu_gpr[reg_num];
}
+static TCGv get_gprh(DisasContext *ctx, int reg_num)
+{
+ assert(get_xl(ctx) == MXL_RV128);
+ if (reg_num == 0) {
+ return ctx->zero;
+ }
+ return cpu_gprh[reg_num];
+}
+
static TCGv dest_gpr(DisasContext *ctx, int reg_num)
{
if (reg_num == 0 || get_olen(ctx) < TARGET_LONG_BITS) {
@@ -235,6 +253,14 @@ static TCGv dest_gpr(DisasContext *ctx, int reg_num)
return cpu_gpr[reg_num];
}
+static TCGv dest_gprh(DisasContext *ctx, int reg_num)
+{
+ if (reg_num == 0 || get_ol(ctx) < MXL_RV128) {
+ return temp_new(ctx);
+ }
+ return cpu_gprh[reg_num];
+}
+
static void gen_set_gpr(DisasContext *ctx, int reg_num, TCGv t)
{
if (reg_num != 0) {
@@ -243,11 +269,27 @@ static void gen_set_gpr(DisasContext *ctx, int reg_num,
TCGv t)
tcg_gen_ext32s_tl(cpu_gpr[reg_num], t);
break;
case MXL_RV64:
+ case MXL_RV128:
tcg_gen_mov_tl(cpu_gpr[reg_num], t);
break;
default:
g_assert_not_reached();
}
+
+ if (get_xl_max(ctx) == MXL_RV128) {
+ tcg_gen_sari_tl(cpu_gprh[reg_num], cpu_gpr[reg_num], 63);
+ }
+ }
+}
+
+static void gen_set_gpr128(DisasContext *ctx, int reg_num, TCGv rl, TCGv rh)
+{
+ if (get_ol(ctx) != MXL_RV128) {
+ g_assert_not_reached();
+ }
+ if (reg_num != 0) {
+ tcg_gen_mov_tl(cpu_gpr[reg_num], rl);
+ tcg_gen_mov_tl(cpu_gprh[reg_num], rh);
}
}
@@ -649,6 +691,7 @@ static void riscv_tr_init_disas_context(DisasContextBase
*dcbase, CPUState *cs)
ctx->lmul = FIELD_EX32(tb_flags, TB_FLAGS, LMUL);
ctx->mlen = 1 << (ctx->sew + 3 - ctx->lmul);
ctx->vl_eq_vlmax = FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX);
+ ctx->misa_mxl_max = env->misa_mxl_max;
ctx->xl = FIELD_EX32(tb_flags, TB_FLAGS, XL);
ctx->cs = cs;
ctx->ntemp = 0;
diff --git a/target/riscv/insn_trans/trans_rvi.c.inc
b/target/riscv/insn_trans/trans_rvi.c.inc
index 34164494b9..d17bde6a3a 100644
--- a/target/riscv/insn_trans/trans_rvi.c.inc
+++ b/target/riscv/insn_trans/trans_rvi.c.inc
@@ -134,7 +134,7 @@ 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)
+static bool gen_load_tl(DisasContext *ctx, arg_lb *a, MemOp memop)
{
TCGv dest = dest_gpr(ctx, a->rd);
TCGv addr = get_gpr(ctx, a->rs1, EXT_NONE);
@@ -150,6 +150,50 @@ static bool gen_load(DisasContext *ctx, arg_lb *a, MemOp
memop)
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)
+{
+ TCGv src1l = get_gpr(ctx, a->rs1, EXT_NONE);
+ TCGv destl = dest_gpr(ctx, a->rd);
+ TCGv desth = dest_gprh(ctx, a->rd);
+ TCGv addrl = tcg_temp_new();
+
+ if (a->imm != 0) {
+ tcg_gen_addi_tl(addrl, src1l, a->imm);
+ } else {
+ tcg_gen_mov_tl(addrl, src1l);
+ }
+
+ if (memop != MO_TEO) {
+ tcg_gen_qemu_ld_tl(destl, addrl, ctx->mem_idx, memop);
+ if (memop & MO_SIGN) {
+ tcg_gen_sari_tl(desth, destl, 63);
+ } else {
+ tcg_gen_movi_tl(desth, 0);
+ }
+ } else {
+ tcg_gen_qemu_ld_tl(memop & MO_BSWAP ? desth : destl, addrl,
+ ctx->mem_idx, MO_TEQ);
+ tcg_gen_addi_tl(addrl, addrl, 8);
+ tcg_gen_qemu_ld_tl(memop & MO_BSWAP ? destl : desth, addrl,
+ ctx->mem_idx, MO_TEQ);
+ }
+
+ gen_set_gpr128(ctx, a->rd, destl, desth);
+
+ tcg_temp_free(addrl);
+ return true;
+}
+
+static bool gen_load(DisasContext *ctx, arg_lb *a, MemOp memop)
+{
+ if (get_xl(ctx) == MXL_RV128) {
+ return gen_load_i128(ctx, a, memop);
+ } else {
+ return gen_load_tl(ctx, a, memop);
+ }
+}
+
static bool trans_lb(DisasContext *ctx, arg_lb *a)
{
return gen_load(ctx, a, MO_SB);
@@ -165,6 +209,18 @@ static bool trans_lw(DisasContext *ctx, arg_lw *a)
return gen_load(ctx, a, MO_TESL);
}
+static bool trans_ld(DisasContext *ctx, arg_ld *a)
+{
+ REQUIRE_64_OR_128BIT(ctx);
+ return gen_load(ctx, a, MO_TESQ);
+}
+
+static bool trans_lq(DisasContext *ctx, arg_lq *a)
+{
+ REQUIRE_128BIT(ctx);
+ return gen_load(ctx, a, MO_TEO);
+}
+
static bool trans_lbu(DisasContext *ctx, arg_lbu *a)
{
return gen_load(ctx, a, MO_UB);
@@ -177,17 +233,17 @@ static bool trans_lhu(DisasContext *ctx, arg_lhu *a)
static bool trans_lwu(DisasContext *ctx, arg_lwu *a)
{
- REQUIRE_64BIT(ctx);
+ REQUIRE_64_OR_128BIT(ctx);
return gen_load(ctx, a, MO_TEUL);
}
-static bool trans_ld(DisasContext *ctx, arg_ld *a)
+static bool trans_ldu(DisasContext *ctx, arg_ldu *a)
{
- REQUIRE_64BIT(ctx);
- return gen_load(ctx, a, MO_TEQ);
+ REQUIRE_128BIT(ctx);
+ return gen_load(ctx, a, MO_TEUQ);
}
-static bool gen_store(DisasContext *ctx, arg_sb *a, MemOp memop)
+static bool gen_store_tl(DisasContext *ctx, arg_sb *a, MemOp memop)
{
TCGv addr = get_gpr(ctx, a->rs1, EXT_NONE);
TCGv data = get_gpr(ctx, a->rs2, EXT_NONE);
@@ -202,6 +258,42 @@ static bool gen_store(DisasContext *ctx, arg_sb *a, MemOp
memop)
return true;
}
+static bool gen_store_i128(DisasContext *ctx, arg_sb *a, MemOp memop)
+{
+ TCGv src1l = get_gpr(ctx, a->rs1, EXT_NONE);
+ TCGv src2l = get_gpr(ctx, a->rs2, EXT_NONE);
+ TCGv src2h = get_gprh(ctx, a->rs2);
+ TCGv addrl = tcg_temp_new();
+
+ if (a->imm != 0) {
+ tcg_gen_addi_tl(addrl, src1l, a->imm);
+ } else {
+ tcg_gen_mov_tl(addrl, src1l);
+ }
+
+ if (memop != MO_TEO) {
+ tcg_gen_qemu_st_tl(src2l, addrl, ctx->mem_idx, memop);
+ } else {
+ tcg_gen_qemu_st_tl(memop & MO_BSWAP ? src2h : src2l, addrl,
+ ctx->mem_idx, MO_TEQ);
+ tcg_gen_addi_tl(addrl, addrl, 8);
+ tcg_gen_qemu_st_tl(memop & MO_BSWAP ? src2l : src2h, addrl,
+ ctx->mem_idx, MO_TEQ);
+ }
+
+ tcg_temp_free(addrl);
+ return true;
+}
+
+static bool gen_store(DisasContext *ctx, arg_sb *a, MemOp memop)
+{
+ if (get_xl(ctx) == MXL_RV128) {
+ return gen_store_i128(ctx, a, memop);
+ } else {
+ return gen_store_tl(ctx, a, memop);
+ }
+}
+
static bool trans_sb(DisasContext *ctx, arg_sb *a)
{
return gen_store(ctx, a, MO_SB);
@@ -219,10 +311,16 @@ static bool trans_sw(DisasContext *ctx, arg_sw *a)
static bool trans_sd(DisasContext *ctx, arg_sd *a)
{
- REQUIRE_64BIT(ctx);
+ REQUIRE_64_OR_128BIT(ctx);
return gen_store(ctx, a, MO_TEQ);
}
+static bool trans_sq(DisasContext *ctx, arg_sq *a)
+{
+ REQUIRE_128BIT(ctx);
+ return gen_store(ctx, a, MO_TEO);
+}
+
static bool trans_addi(DisasContext *ctx, arg_addi *a)
{
return gen_arith_imm_fn(ctx, a, EXT_NONE, tcg_gen_addi_tl);
--
2.33.0
- [PATCH v4 03/17] target/riscv: additional macros to check instruction support, (continued)
- [PATCH v4 03/17] target/riscv: additional macros to check instruction support, Frédéric Pétrot, 2021/10/25
- [PATCH v4 02/17] qemu/int128: addition of a few 128-bit operations, Frédéric Pétrot, 2021/10/25
- [PATCH v4 04/17] target/riscv: separation of bitwise logic and aritmetic helpers, Frédéric Pétrot, 2021/10/25
- [PATCH v4 09/17] target/riscv: support for 128-bit bitwise instructions, Frédéric Pétrot, 2021/10/25
- [PATCH v4 08/17] target/riscv: accessors to registers upper part and 128-bit load/store,
Frédéric Pétrot <=
- [PATCH v4 06/17] target/riscv: setup everything so that riscv128-softmmu compiles, Frédéric Pétrot, 2021/10/25
- [PATCH v4 07/17] target/riscv: moving some insns close to similar insns, Frédéric Pétrot, 2021/10/25
- [PATCH v4 10/17] target/riscv: support for 128-bit U-type instructions, Frédéric Pétrot, 2021/10/25
- [PATCH v4 11/17] target/riscv: support for 128-bit shift instructions, Frédéric Pétrot, 2021/10/25
- [PATCH v4 13/17] target/riscv: support for 128-bit M extension, Frédéric Pétrot, 2021/10/25