diff mbox series

[RFC,v2,2/7] target/riscv: rvk: add implementation of instructions for Zbk*

Message ID 20211116080621.2521-3-liweiwei@iscas.ac.cn (mailing list archive)
State New, archived
Headers show
Series support subsets of scalar crypto extension | expand

Commit Message

Weiwei Li Nov. 16, 2021, 8:06 a.m. UTC 
- reuse partial instructions of Zbb/Zbc extensions
   - add brev8 packh, unzip, zip, etc.

Signed-off-by: liweiwei <liweiwei@iscas.ac.cn>
Signed-off-by: wangjunqiang <wangjunqiang@iscas.ac.cn>
---
 target/riscv/bitmanip_helper.c          |  74 ++++++++++++++
 target/riscv/helper.h                   |   5 +
 target/riscv/insn32.decode              |  52 ++++++----
 target/riscv/insn_trans/trans_rvb.c.inc | 127 +++++++++++++++++++++---
 target/riscv/translate.c                |   7 ++
 5 files changed, 234 insertions(+), 31 deletions(-)
diff mbox series

Patch

diff --git a/target/riscv/bitmanip_helper.c b/target/riscv/bitmanip_helper.c
index f1b5e5549f..0de92d968c 100644
--- a/target/riscv/bitmanip_helper.c
+++ b/target/riscv/bitmanip_helper.c
@@ -49,3 +49,77 @@  target_ulong HELPER(clmulr)(target_ulong rs1, target_ulong rs2)
 
     return result;
 }
+
+static inline target_ulong do_swap(target_ulong x, uint64_t mask, int shift)
+{
+    return ((x & mask) << shift) | ((x & ~mask) >> shift);
+}
+
+target_ulong HELPER(brev8)(target_ulong rs1)
+{
+    target_ulong x = rs1;
+    x = do_swap(x, 0x55, 1);
+    x = do_swap(x, 0x33, 2);
+    x = do_swap(x, 0x0f, 4);
+    return x;
+}
+
+static inline target_ulong do_xperm(target_ulong rs1, target_ulong rs2,
+                                    uint32_t sz_log2)
+{
+    target_ulong r = 0;
+    target_ulong sz = 1LL << sz_log2;
+    target_ulong mask = (1LL << sz) - 1;
+    for (int i = 0; i < TARGET_LONG_BITS; i += sz) {
+        target_ulong pos = ((rs2 >> i) & mask) << sz_log2;
+        if (pos < sizeof(target_ulong) * 8) {
+            r |= ((rs1 >> pos) & mask) << i;
+        }
+    }
+    return r;
+}
+
+target_ulong HELPER(xperm4)(target_ulong rs1, target_ulong rs2)
+{
+    return do_xperm(rs1, rs2, 2);
+}
+
+target_ulong HELPER(xperm8)(target_ulong rs1, target_ulong rs2)
+{
+    return do_xperm(rs1, rs2, 3);
+}
+
+static const uint64_t shuf_masks[] = {
+    dup_const(MO_8, 0x44),
+    dup_const(MO_8, 0x30),
+    dup_const(MO_16, 0x0f00),
+    dup_const(MO_32, 0xff0000)
+};
+
+static inline target_ulong do_shuf_stage(target_ulong src, uint64_t maskL,
+                                         uint64_t maskR, int shift)
+{
+    target_ulong x = src & ~(maskL | maskR);
+    x |= ((src << shift) & maskL) | ((src >> shift) & maskR);
+    return x;
+}
+
+target_ulong HELPER(unzip)(target_ulong rs1)
+{
+    target_ulong x = rs1;
+    x = do_shuf_stage(x, shuf_masks[0], shuf_masks[0] >> 1, 1);
+    x = do_shuf_stage(x, shuf_masks[1], shuf_masks[1] >> 2, 2);
+    x = do_shuf_stage(x, shuf_masks[2], shuf_masks[2] >> 4, 4);
+    x = do_shuf_stage(x, shuf_masks[3], shuf_masks[3] >> 8, 8);
+    return x;
+}
+
+target_ulong HELPER(zip)(target_ulong rs1)
+{
+    target_ulong x = rs1;
+    x = do_shuf_stage(x, shuf_masks[3], shuf_masks[3] >> 8, 8);
+    x = do_shuf_stage(x, shuf_masks[2], shuf_masks[2] >> 4, 4);
+    x = do_shuf_stage(x, shuf_masks[1], shuf_masks[1] >> 2, 2);
+    x = do_shuf_stage(x, shuf_masks[0], shuf_masks[0] >> 1, 1);
+    return x;
+}
diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index c7a5376227..1cc626893f 100644
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -61,6 +61,11 @@  DEF_HELPER_FLAGS_1(fclass_d, TCG_CALL_NO_RWG_SE, tl, i64)
 /* Bitmanip */
 DEF_HELPER_FLAGS_2(clmul, TCG_CALL_NO_RWG_SE, tl, tl, tl)
 DEF_HELPER_FLAGS_2(clmulr, TCG_CALL_NO_RWG_SE, tl, tl, tl)
+DEF_HELPER_FLAGS_2(xperm4, TCG_CALL_NO_RWG_SE, tl, tl, tl)
+DEF_HELPER_FLAGS_2(xperm8, TCG_CALL_NO_RWG_SE, tl, tl, tl)
+DEF_HELPER_FLAGS_1(brev8, TCG_CALL_NO_RWG_SE, tl, tl)
+DEF_HELPER_FLAGS_1(unzip, TCG_CALL_NO_RWG_SE, tl, tl)
+DEF_HELPER_FLAGS_1(zip, TCG_CALL_NO_RWG_SE, tl, tl)
 
 /* Special functions */
 DEF_HELPER_2(csrr, tl, env, int)
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index 2f251dac1b..a5333c4533 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -672,8 +672,22 @@  sh2add_uw  0010000 .......... 100 ..... 0111011 @r
 sh3add_uw  0010000 .......... 110 ..... 0111011 @r
 slli_uw    00001 ............ 001 ..... 0011011 @sh
 
-# *** RV32 Zbb Standard Extension ***
+# *** RV32 Zbb/Zbkb Standard Extension ***
 andn       0100000 .......... 111 ..... 0110011 @r
+rol        0110000 .......... 001 ..... 0110011 @r
+ror        0110000 .......... 101 ..... 0110011 @r
+rori       01100 ............ 101 ..... 0010011 @sh
+# The encoding for rev8 differs between RV32 and RV64.
+# rev8_32 denotes the RV32 variant.
+rev8_32    011010 011000 ..... 101 ..... 0010011 @r2
+# The encoding for zext.h differs between RV32 and RV64.
+# zext_h_32 denotes the RV32 variant.
+{
+  zext_h_32  0000100 00000 ..... 100 ..... 0110011 @r2
+  pack       0000100 ..... ..... 100 ..... 0110011 @r
+}
+xnor       0100000 .......... 100 ..... 0110011 @r
+# *** RV32 extra Zbb Standard Extension ***
 clz        011000 000000 ..... 001 ..... 0010011 @r2
 cpop       011000 000010 ..... 001 ..... 0010011 @r2
 ctz        011000 000001 ..... 001 ..... 0010011 @r2
@@ -683,23 +697,15 @@  min        0000101 .......... 100 ..... 0110011 @r
 minu       0000101 .......... 101 ..... 0110011 @r
 orc_b      001010 000111 ..... 101 ..... 0010011 @r2
 orn        0100000 .......... 110 ..... 0110011 @r
-# The encoding for rev8 differs between RV32 and RV64.
-# rev8_32 denotes the RV32 variant.
-rev8_32    011010 011000 ..... 101 ..... 0010011 @r2
-rol        0110000 .......... 001 ..... 0110011 @r
-ror        0110000 .......... 101 ..... 0110011 @r
-rori       01100 ............ 101 ..... 0010011 @sh
 sext_b     011000 000100 ..... 001 ..... 0010011 @r2
 sext_h     011000 000101 ..... 001 ..... 0010011 @r2
-xnor       0100000 .......... 100 ..... 0110011 @r
-# The encoding for zext.h differs between RV32 and RV64.
-# zext_h_32 denotes the RV32 variant.
-zext_h_32  0000100 00000 ..... 100 ..... 0110011 @r2
+# *** RV32 extra Zbkb Standard Extension ***
+brev8      0110100 00111 ..... 101 ..... 0010011 @r2  #grevi
+packh      0000100  .......... 111 ..... 0110011 @r
+unzip      0000100 01111 ..... 101 ..... 0010011 @r2  #unshfl
+zip        0000100 01111 ..... 001 ..... 0010011 @r2  #shfl
 
-# *** RV64 Zbb Standard Extension (in addition to RV32 Zbb) ***
-clzw       0110000 00000 ..... 001 ..... 0011011 @r2
-ctzw       0110000 00001 ..... 001 ..... 0011011 @r2
-cpopw      0110000 00010 ..... 001 ..... 0011011 @r2
+# *** RV64 Zbb/Zbkb Standard Extension (in addition to RV32 Zbb/Zbkb) ***
 # The encoding for rev8 differs between RV32 and RV64.
 # When executing on RV64, the encoding used in RV32 is an illegal
 # instruction, so we use different handler functions to differentiate.
@@ -710,13 +716,25 @@  rorw       0110000 .......... 101 ..... 0111011 @r
 # The encoding for zext.h differs between RV32 and RV64.
 # When executing on RV64, the encoding used in RV32 is an illegal
 # instruction, so we use different handler functions to differentiate.
-zext_h_64  0000100 00000 ..... 100 ..... 0111011 @r2
+{
+  zext_h_64  0000100 00000 ..... 100 ..... 0111011 @r2
+  packw      0000100 ..... ..... 100 ..... 0111011 @r
+}
+# *** RV64 extra Zbb Standard Extension (in addition to RV32 Zbb) ***
+clzw       0110000 00000 ..... 001 ..... 0011011 @r2
+ctzw       0110000 00001 ..... 001 ..... 0011011 @r2
+cpopw      0110000 00010 ..... 001 ..... 0011011 @r2
 
-# *** RV32 Zbc Standard Extension ***
+# *** RV32 Zbc/Zbkc Standard Extension ***
 clmul      0000101 .......... 001 ..... 0110011 @r
 clmulh     0000101 .......... 011 ..... 0110011 @r
+# *** RV32 extra Zbc Standard Extension ***
 clmulr     0000101 .......... 010 ..... 0110011 @r
 
+# *** RV32 Zbkx Standard Extension ***
+xperm4     0010100 .......... 010 ..... 0110011 @r
+xperm8     0010100 .......... 100 ..... 0110011 @r
+
 # *** RV32 Zbs Standard Extension ***
 bclr       0100100 .......... 001 ..... 0110011 @r
 bclri      01001. ........... 001 ..... 0010011 @sh
diff --git a/target/riscv/insn_trans/trans_rvb.c.inc b/target/riscv/insn_trans/trans_rvb.c.inc
index c8d31907c5..8488d93b11 100644
--- a/target/riscv/insn_trans/trans_rvb.c.inc
+++ b/target/riscv/insn_trans/trans_rvb.c.inc
@@ -1,5 +1,5 @@ 
 /*
- * RISC-V translation routines for the Zb[abcs] Standard Extension.
+ * RISC-V translation routines for the Zb[abcs] and Zbk[bcx] Standard Extension.
  *
  * Copyright (c) 2020 Kito Cheng, kito.cheng@sifive.com
  * Copyright (c) 2020 Frank Chang, frank.chang@sifive.com
@@ -42,6 +42,18 @@ 
     }                                            \
 } while (0)
 
+#define REQUIRE_ZBKB(ctx) do {                   \
+    if (!RISCV_CPU(ctx->cs)->cfg.ext_zbkb) {     \
+        return false;                            \
+    }                                            \
+} while (0)
+
+#define REQUIRE_ZBKX(ctx) do {                   \
+    if (!RISCV_CPU(ctx->cs)->cfg.ext_zbkx) {     \
+        return false;                            \
+    }                                            \
+} while (0)
+
 static void gen_clz(TCGv ret, TCGv arg1)
 {
     tcg_gen_clzi_tl(ret, arg1, TARGET_LONG_BITS);
@@ -85,19 +97,19 @@  static bool trans_cpop(DisasContext *ctx, arg_cpop *a)
 
 static bool trans_andn(DisasContext *ctx, arg_andn *a)
 {
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     return gen_arith(ctx, a, EXT_NONE, tcg_gen_andc_tl);
 }
 
 static bool trans_orn(DisasContext *ctx, arg_orn *a)
 {
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     return gen_arith(ctx, a, EXT_NONE, tcg_gen_orc_tl);
 }
 
 static bool trans_xnor(DisasContext *ctx, arg_xnor *a)
 {
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     return gen_arith(ctx, a, EXT_NONE, tcg_gen_eqv_tl);
 }
 
@@ -247,7 +259,7 @@  static void gen_rorw(TCGv ret, TCGv arg1, TCGv arg2)
 
 static bool trans_ror(DisasContext *ctx, arg_ror *a)
 {
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     return gen_shift_per_ol(ctx, a, EXT_NONE, tcg_gen_rotr_tl, gen_rorw);
 }
 
@@ -264,7 +276,7 @@  static void gen_roriw(TCGv ret, TCGv arg1, target_long shamt)
 
 static bool trans_rori(DisasContext *ctx, arg_rori *a)
 {
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     return gen_shift_imm_fn_per_ol(ctx, a, EXT_NONE,
                                    tcg_gen_rotri_tl, gen_roriw);
 }
@@ -289,7 +301,7 @@  static void gen_rolw(TCGv ret, TCGv arg1, TCGv arg2)
 
 static bool trans_rol(DisasContext *ctx, arg_rol *a)
 {
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     return gen_shift_per_ol(ctx, a, EXT_NONE, tcg_gen_rotl_tl, gen_rolw);
 }
 
@@ -301,14 +313,14 @@  static void gen_rev8_32(TCGv ret, TCGv src1)
 static bool trans_rev8_32(DisasContext *ctx, arg_rev8_32 *a)
 {
     REQUIRE_32BIT(ctx);
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     return gen_unary(ctx, a, EXT_NONE, gen_rev8_32);
 }
 
 static bool trans_rev8_64(DisasContext *ctx, arg_rev8_64 *a)
 {
     REQUIRE_64BIT(ctx);
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     return gen_unary(ctx, a, EXT_NONE, tcg_gen_bswap_tl);
 }
 
@@ -403,7 +415,7 @@  static bool trans_cpopw(DisasContext *ctx, arg_cpopw *a)
 static bool trans_rorw(DisasContext *ctx, arg_rorw *a)
 {
     REQUIRE_64BIT(ctx);
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     ctx->ol = MXL_RV32;
     return gen_shift(ctx, a, EXT_NONE, gen_rorw);
 }
@@ -411,7 +423,7 @@  static bool trans_rorw(DisasContext *ctx, arg_rorw *a)
 static bool trans_roriw(DisasContext *ctx, arg_roriw *a)
 {
     REQUIRE_64BIT(ctx);
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     ctx->ol = MXL_RV32;
     return gen_shift_imm_fn(ctx, a, EXT_NONE, gen_roriw);
 }
@@ -419,7 +431,7 @@  static bool trans_roriw(DisasContext *ctx, arg_roriw *a)
 static bool trans_rolw(DisasContext *ctx, arg_rolw *a)
 {
     REQUIRE_64BIT(ctx);
-    REQUIRE_ZBB(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbb, zbkb);
     ctx->ol = MXL_RV32;
     return gen_shift(ctx, a, EXT_NONE, gen_rolw);
 }
@@ -483,7 +495,7 @@  static bool trans_slli_uw(DisasContext *ctx, arg_slli_uw *a)
 
 static bool trans_clmul(DisasContext *ctx, arg_clmul *a)
 {
-    REQUIRE_ZBC(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbc, zbkc);
     return gen_arith(ctx, a, EXT_NONE, gen_helper_clmul);
 }
 
@@ -495,7 +507,7 @@  static void gen_clmulh(TCGv dst, TCGv src1, TCGv src2)
 
 static bool trans_clmulh(DisasContext *ctx, arg_clmulr *a)
 {
-    REQUIRE_ZBC(ctx);
+    REQUIRE_EITHER_EXT(ctx, zbc, zbkc);
     return gen_arith(ctx, a, EXT_NONE, gen_clmulh);
 }
 
@@ -504,3 +516,90 @@  static bool trans_clmulr(DisasContext *ctx, arg_clmulh *a)
     REQUIRE_ZBC(ctx);
     return gen_arith(ctx, a, EXT_NONE, gen_helper_clmulr);
 }
+
+static void gen_pack(TCGv ret, TCGv src1, TCGv src2)
+{
+    tcg_gen_deposit_tl(ret, src1, src2,
+                       TARGET_LONG_BITS / 2,
+                       TARGET_LONG_BITS / 2);
+}
+
+static void gen_packh(TCGv ret, TCGv src1, TCGv src2)
+{
+    TCGv t = tcg_temp_new();
+    tcg_gen_ext8u_tl(t, src2);
+    tcg_gen_deposit_tl(ret, src1, t, 8, TARGET_LONG_BITS - 8);
+    tcg_temp_free(t);
+}
+
+static void gen_packw(TCGv ret, TCGv src1, TCGv src2)
+{
+    TCGv t = tcg_temp_new();
+    tcg_gen_ext16s_tl(t, src2);
+    tcg_gen_deposit_tl(ret, src1, t, 16, 48);
+    tcg_temp_free(t);
+}
+
+static bool trans_brev8(DisasContext *ctx, arg_brev8 *a)
+{
+    REQUIRE_ZBKB(ctx);
+    TCGv dest = dest_gpr(ctx, a->rd);
+    TCGv src1 = get_gpr(ctx, a->rs1, EXT_NONE);
+    gen_helper_brev8(dest, src1);
+    gen_set_gpr(ctx, a->rd, dest);
+    return true;
+}
+
+static bool trans_pack(DisasContext *ctx, arg_pack *a)
+{
+    REQUIRE_ZBKB(ctx);
+    return gen_arith(ctx, a, EXT_NONE, gen_pack);
+}
+
+static bool trans_packh(DisasContext *ctx, arg_packh *a)
+{
+    REQUIRE_ZBKB(ctx);
+    return gen_arith(ctx, a, EXT_NONE, gen_packh);
+}
+
+static bool trans_packw(DisasContext *ctx, arg_packw *a)
+{
+    REQUIRE_64BIT(ctx);
+    REQUIRE_ZBKB(ctx);
+    return gen_arith(ctx, a, EXT_NONE, gen_packw);
+}
+
+static bool trans_unzip(DisasContext *ctx, arg_unzip *a)
+{
+    REQUIRE_ZBKB(ctx);
+    REQUIRE_32BIT(ctx);
+
+    TCGv dest = dest_gpr(ctx, a->rd);
+    TCGv src1 = get_gpr(ctx, a->rs1, EXT_NONE);
+    gen_helper_unzip(dest, src1);
+    gen_set_gpr(ctx, a->rd, dest);
+    return true;
+}
+
+static bool trans_zip(DisasContext *ctx, arg_zip *a)
+{
+    REQUIRE_ZBKB(ctx);
+    REQUIRE_32BIT(ctx);
+    TCGv dest = dest_gpr(ctx, a->rd);
+    TCGv src1 = get_gpr(ctx, a->rs1, EXT_NONE);
+    gen_helper_zip(dest, src1);
+    gen_set_gpr(ctx, a->rd, dest);
+    return true;
+}
+
+static bool trans_xperm4(DisasContext *ctx, arg_xperm4 *a)
+{
+    REQUIRE_ZBKX(ctx);
+    return gen_arith(ctx, a, EXT_NONE, gen_helper_xperm4);
+}
+
+static bool trans_xperm8(DisasContext *ctx, arg_xperm8 *a)
+{
+    REQUIRE_ZBKX(ctx);
+    return gen_arith(ctx, a, EXT_NONE, gen_helper_xperm8);
+}
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 1d57bc97b5..c319707a6f 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -374,6 +374,13 @@  EX_SH(12)
     }                              \
 } while (0)
 
+#define REQUIRE_EITHER_EXT(ctx, A, B) do {       \
+    if (!RISCV_CPU(ctx->cs)->cfg.ext_##A &&      \
+        !RISCV_CPU(ctx->cs)->cfg.ext_##B) {      \
+        return false;                            \
+    }                                            \
+} while (0)
+
 static int ex_rvc_register(DisasContext *ctx, int reg)
 {
     return 8 + reg;