[PATCH v3 09/19] target/loongarch: Add fixed point extra instruction translation

[Song Gao]

This patch implement fixed point extra instruction translation.

This includes:
- CRC[C].W.{B/H/W/D}.W
- SYSCALL
- BREAK
- ASRT{LE/GT}.D
- RDTIME{L/H}.W, RDTIME.D
- CPUCFG

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 target/loongarch/helper.h                 |  4 ++
 target/loongarch/insn_trans/trans_extra.c | 88 +++++++++++++++++++++++++++++++
 target/loongarch/insns.decode             | 25 +++++++++
 target/loongarch/op_helper.c              | 26 +++++++++
 target/loongarch/translate.c              |  1 +
 5 files changed, 144 insertions(+)
 create mode 100644 target/loongarch/insn_trans/trans_extra.c

diff --git a/target/loongarch/helper.h b/target/loongarch/helper.h
index 09b5a3d..e4b4595 100644
--- a/target/loongarch/helper.h
+++ b/target/loongarch/helper.h
@@ -14,3 +14,7 @@ DEF_HELPER_FLAGS_1(bitswap, TCG_CALL_NO_RWG_SE, tl, tl)
 
 DEF_HELPER_3(asrtle_d, void, env, tl, tl)
 DEF_HELPER_3(asrtgt_d, void, env, tl, tl)
+
+DEF_HELPER_3(crc32, tl, tl, tl, tl)
+DEF_HELPER_3(crc32c, tl, tl, tl, tl)
+DEF_HELPER_2(cpucfg, tl, env, tl)
diff --git a/target/loongarch/insn_trans/trans_extra.c 
b/target/loongarch/insn_trans/trans_extra.c
new file mode 100644
index 0000000..d07e791
--- /dev/null
+++ b/target/loongarch/insn_trans/trans_extra.c
@@ -0,0 +1,88 @@
+/*
+ * LoongArch translate functions
+ *
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+static bool trans_break(DisasContext *ctx, arg_break *a)
+{
+    generate_exception(ctx, EXCP_BREAK);
+    return true;
+}
+
+static bool trans_syscall(DisasContext *ctx, arg_syscall *a)
+{
+    generate_exception(ctx, EXCP_SYSCALL);
+    return true;
+}
+
+static bool trans_asrtle_d(DisasContext *ctx, arg_asrtle_d * a)
+{
+    TCGv src1 = gpr_src(ctx, a->rj, EXT_NONE);
+    TCGv src2 = gpr_src(ctx, a->rk, EXT_NONE);
+
+    gen_helper_asrtle_d(cpu_env, src1, src2);
+    return true;
+}
+
+static bool trans_asrtgt_d(DisasContext *ctx, arg_asrtgt_d * a)
+{
+    TCGv src1 = gpr_src(ctx, a->rj, EXT_NONE);
+    TCGv src2 = gpr_src(ctx, a->rk, EXT_NONE);
+
+    gen_helper_asrtgt_d(cpu_env, src1, src2);
+    return true;
+}
+
+static bool trans_rdtimel_w(DisasContext *ctx, arg_rdtimel_w *a)
+{
+    tcg_gen_movi_tl(cpu_gpr[a->rd], 0);
+    return true;
+}
+
+static bool trans_rdtimeh_w(DisasContext *ctx, arg_rdtimeh_w *a)
+{
+    tcg_gen_movi_tl(cpu_gpr[a->rd], 0);
+    return true;
+}
+
+static bool trans_rdtime_d(DisasContext *ctx, arg_rdtime_d *a)
+{
+    tcg_gen_movi_tl(cpu_gpr[a->rd], 0);
+    return true;
+}
+
+static bool trans_cpucfg(DisasContext *ctx, arg_cpucfg *a)
+{
+    TCGv dest = gpr_dst(ctx, a->rd);
+    TCGv src1 = gpr_src(ctx, a->rj, EXT_NONE);
+
+    gen_helper_cpucfg(dest, cpu_env, src1);
+    return true;
+}
+
+static bool gen_crc(DisasContext *ctx, arg_fmt_rdrjrk *a,
+                    void (*func)(TCGv, TCGv, TCGv, TCGv),
+                    TCGv tsz)
+{
+    ctx->dst_ext = EXT_SIGN;
+    TCGv dest = gpr_dst(ctx, a->rd);
+    TCGv src1 = gpr_src(ctx, a->rj, EXT_NONE);
+    TCGv src2 = gpr_src(ctx, a->rk, EXT_NONE);
+
+    func(dest, src2, src1, tsz);
+
+    gen_set_gpr(ctx, a->rd, dest);
+    return true;
+}
+
+TRANS(crc_w_b_w, gen_crc, gen_helper_crc32, tcg_constant_tl(1))
+TRANS(crc_w_h_w, gen_crc, gen_helper_crc32, tcg_constant_tl(2))
+TRANS(crc_w_w_w, gen_crc, gen_helper_crc32, tcg_constant_tl(4))
+TRANS(crc_w_d_w, gen_crc, gen_helper_crc32, tcg_constant_tl(8))
+TRANS(crcc_w_b_w, gen_crc, gen_helper_crc32c, tcg_constant_tl(1))
+TRANS(crcc_w_h_w, gen_crc, gen_helper_crc32c, tcg_constant_tl(2))
+TRANS(crcc_w_w_w, gen_crc, gen_helper_crc32c, tcg_constant_tl(4))
+TRANS(crcc_w_d_w, gen_crc, gen_helper_crc32c, tcg_constant_tl(8))
diff --git a/target/loongarch/insns.decode b/target/loongarch/insns.decode
index 574c055..66bc314 100644
--- a/target/loongarch/insns.decode
+++ b/target/loongarch/insns.decode
@@ -27,6 +27,7 @@
 %si14    10:s14
 %hint    0:5
 %whint   0:15
+%code    0:15
 
 #
 # Argument sets
@@ -46,6 +47,8 @@
 &fmt_rdrjsi14       rd rj si14
 &fmt_hintrjsi12     hint rj si12
 &fmt_whint          whint
+&fmt_rjrk           rj rk
+&fmt_code           code
 
 #
 # Formats
@@ -65,6 +68,8 @@
 @fmt_hintrjsi12      .... ...... ............ ..... .....     &fmt_hintrjsi12  
   %hint %rj %si12
 @fmt_whint           .... ........ ..... ...............      &fmt_whint       
   %whint
 @fmt_rdrjsi14        .... .... .............. ..... .....     &fmt_rdrjsi14    
   %rd %rj %si14
+@fmt_rjrk            .... ........ ..... ..... ..... .....    &fmt_rjrk        
   %rj %rk
+@fmt_code            .... ........ ..... ...............      &fmt_code        
   %code
 
 #
 # Fixed point arithmetic operation instruction
@@ -260,3 +265,23 @@ ammax_db_wu      0011 10000111 00000 ..... ..... .....    
@fmt_rdrjrk
 ammax_db_du      0011 10000111 00001 ..... ..... .....    @fmt_rdrjrk
 ammin_db_wu      0011 10000111 00010 ..... ..... .....    @fmt_rdrjrk
 ammin_db_du      0011 10000111 00011 ..... ..... .....    @fmt_rdrjrk
+
+#
+# Fixed point extra instruction
+#
+crc_w_b_w        0000 00000010 01000 ..... ..... .....    @fmt_rdrjrk
+crc_w_h_w        0000 00000010 01001 ..... ..... .....    @fmt_rdrjrk
+crc_w_w_w        0000 00000010 01010 ..... ..... .....    @fmt_rdrjrk
+crc_w_d_w        0000 00000010 01011 ..... ..... .....    @fmt_rdrjrk
+crcc_w_b_w       0000 00000010 01100 ..... ..... .....    @fmt_rdrjrk
+crcc_w_h_w       0000 00000010 01101 ..... ..... .....    @fmt_rdrjrk
+crcc_w_w_w       0000 00000010 01110 ..... ..... .....    @fmt_rdrjrk
+crcc_w_d_w       0000 00000010 01111 ..... ..... .....    @fmt_rdrjrk
+break            0000 00000010 10100 ...............      @fmt_code
+syscall          0000 00000010 10110 ...............      @fmt_code
+asrtle_d         0000 00000000 00010 ..... ..... 00000    @fmt_rjrk
+asrtgt_d         0000 00000000 00011 ..... ..... 00000    @fmt_rjrk
+rdtimel_w        0000 00000000 00000 11000 ..... .....    @fmt_rdrj
+rdtimeh_w        0000 00000000 00000 11001 ..... .....    @fmt_rdrj
+rdtime_d         0000 00000000 00000 11010 ..... .....    @fmt_rdrj
+cpucfg           0000 00000000 00000 11011 ..... .....    @fmt_rdrj
diff --git a/target/loongarch/op_helper.c b/target/loongarch/op_helper.c
index a4ffaf9..0a1a47b 100644
--- a/target/loongarch/op_helper.c
+++ b/target/loongarch/op_helper.c
@@ -14,6 +14,8 @@
 #include "exec/exec-all.h"
 #include "exec/cpu_ldst.h"
 #include "internals.h"
+#include "qemu/crc32c.h"
+#include <zlib.h>
 
 /* Exceptions helpers */
 void helper_raise_exception(CPULoongArchState *env, uint32_t exception)
@@ -57,3 +59,27 @@ void helper_asrtgt_d(CPULoongArchState *env, target_ulong 
rj, target_ulong rk)
         do_raise_exception(env, EXCP_ADE, GETPC());
     }
 }
+
+target_ulong helper_crc32(target_ulong val, target_ulong m, uint64_t sz)
+{
+    uint8_t buf[8];
+    target_ulong mask = ((sz * 8) == 64) ? -1ULL : ((1ULL << (sz * 8)) - 1);
+
+    m &= mask;
+    stq_le_p(buf, m);
+    return (int32_t) (crc32(val ^ 0xffffffff, buf, sz) ^ 0xffffffff);
+}
+
+target_ulong helper_crc32c(target_ulong val, target_ulong m, uint64_t sz)
+{
+    uint8_t buf[8];
+    target_ulong mask = ((sz * 8) == 64) ? -1ULL : ((1ULL << (sz * 8)) - 1);
+    m &= mask;
+    stq_le_p(buf, m);
+    return (int32_t) (crc32c(val, buf, sz) ^ 0xffffffff);
+}
+
+target_ulong helper_cpucfg(CPULoongArchState *env, target_ulong rj)
+{
+    return env->cpucfg[rj];
+}
diff --git a/target/loongarch/translate.c b/target/loongarch/translate.c
index a6482c3..77b0180 100644
--- a/target/loongarch/translate.c
+++ b/target/loongarch/translate.c
@@ -192,6 +192,7 @@ static bool gen_r3(DisasContext *ctx, arg_fmt_rdrjrk *a,
 #include "insn_trans/trans_bit.c"
 #include "insn_trans/trans_memory.c"
 #include "insn_trans/trans_atomic.c"
+#include "insn_trans/trans_extra.c"
 
 static void loongarch_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
 {
-- 
1.8.3.1