diff --git a/target/hexagon/opcodes.h b/target/hexagon/opcodes.h
new file mode 100644
index 0000000..9d38687
--- /dev/null
+++ b/target/hexagon/opcodes.h
@@ -0,0 +1,63 @@
+/*
+ *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that 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/>.
+ */
+
+#ifndef HEXAGON_OPCODES_H
+#define HEXAGON_OPCODES_H
+
+#include "qemu/bitmap.h"
+#include "attribs.h"
+
+typedef enum {
+#define OPCODE(IID) IID
+#include "opcodes_def_generated.h"
+    XX_LAST_OPCODE
+#undef OPCODE
+} Opcode;
+
+typedef enum {
+    NORMAL,
+    HALF,
+    SUBINSN_A,
+    SUBINSN_L1,
+    SUBINSN_L2,
+    SUBINSN_S1,
+    SUBINSN_S2,
+    EXT_noext,
+    EXT_mmvec,
+    XX_LAST_ENC_CLASS
+} EncClass;
+
+extern const char * const opcode_names[];
+
+extern const char * const opcode_reginfo[];
+extern const char * const opcode_rregs[];
+extern const char * const opcode_wregs[];
+
+typedef struct {
+    const char * const encoding;
+    const EncClass enc_class;
+} OpcodeEncoding;
+
+extern const OpcodeEncoding opcode_encodings[XX_LAST_OPCODE];
+
+extern DECLARE_BITMAP(opcode_attribs[XX_LAST_OPCODE], A_ZZ_LASTATTRIB);
+
+extern void opcode_init(void);
+
+extern int opcode_which_immediate_is_extended(Opcode opcode);
+
+#endif
diff --git a/target/hexagon/opcodes.c b/target/hexagon/opcodes.c
new file mode 100644
index 0000000..ba41450
--- /dev/null
+++ b/target/hexagon/opcodes.c
@@ -0,0 +1,142 @@
+/*
+ *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that 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/>.
+ */
+
+/*
+ * opcodes.c
+ *
+ * data tables generated automatically
+ * Maybe some functions too
+ */
+
+#include "qemu/osdep.h"
+#include "opcodes.h"
+#include "decode.h"
+
+#define VEC_DESCR(A, B, C) DESCR(A, B, C)
+#define DONAME(X) #X
+
+const char * const opcode_names[] = {
+#define OPCODE(IID) DONAME(IID)
+#include "opcodes_def_generated.h"
+    NULL
+#undef OPCODE
+};
+
+const char * const opcode_reginfo[] = {
+#define IMMINFO(TAG, SIGN, SIZE, SHAMT, SIGN2, SIZE2, SHAMT2)    /* nothing */
+#define REGINFO(TAG, REGINFO, RREGS, WREGS) REGINFO,
+#include "op_regs_generated.h"
+    NULL
+#undef REGINFO
+#undef IMMINFO
+};
+
+
+const char * const opcode_rregs[] = {
+#define IMMINFO(TAG, SIGN, SIZE, SHAMT, SIGN2, SIZE2, SHAMT2)    /* nothing */
+#define REGINFO(TAG, REGINFO, RREGS, WREGS) RREGS,
+#include "op_regs_generated.h"
+    NULL
+#undef REGINFO
+#undef IMMINFO
+};
+
+
+const char * const opcode_wregs[] = {
+#define IMMINFO(TAG, SIGN, SIZE, SHAMT, SIGN2, SIZE2, SHAMT2)    /* nothing */
+#define REGINFO(TAG, REGINFO, RREGS, WREGS) WREGS,
+#include "op_regs_generated.h"
+    NULL
+#undef REGINFO
+#undef IMMINFO
+};
+
+const char * const opcode_short_semantics[] = {
+#define DEF_SHORTCODE(TAG, SHORTCODE)              [TAG] = #SHORTCODE,
+#include "shortcode_generated.h"
+#undef DEF_SHORTCODE
+    NULL
+};
+
+DECLARE_BITMAP(opcode_attribs[XX_LAST_OPCODE], A_ZZ_LASTATTRIB);
+
+static void init_attribs(int tag, ...)
+{
+    va_list ap;
+    int attr;
+    va_start(ap, tag);
+    while ((attr = va_arg(ap, int)) != 0) {
+        set_bit(attr, opcode_attribs[tag]);
+    }
+}
+
+const OpcodeEncoding opcode_encodings[] = {
+#define DEF_ENC32(OPCODE, ENCSTR) \
+    [OPCODE] = { .encoding = ENCSTR },
+
+#define DEF_ENC_SUBINSN(OPCODE, CLASS, ENCSTR) \
+    [OPCODE] = { .encoding = ENCSTR, .enc_class = CLASS },
+
+#define DEF_EXT_ENC(OPCODE, CLASS, ENCSTR) \
+    [OPCODE] = { .encoding = ENCSTR, .enc_class = CLASS },
+
+#include "imported/encode.def"
+
+#undef DEF_ENC32
+#undef DEF_ENC_SUBINSN
+#undef DEF_EXT_ENC
+};
+
+void opcode_init(void)
+{
+    init_attribs(0, 0);
+
+#define ATTRIBS(...) , ## __VA_ARGS__, 0
+#define OP_ATTRIB(TAG, ARGS) init_attribs(TAG ARGS);
+#include "op_attribs_generated.h"
+#undef OP_ATTRIB
+#undef ATTRIBS
+
+    decode_init();
+}
+
+
+#define NEEDLE "IMMEXT("
+
+int opcode_which_immediate_is_extended(Opcode opcode)
+{
+    const char *p;
+
+    g_assert(opcode < XX_LAST_OPCODE);
+    g_assert(GET_ATTRIB(opcode, A_EXTENDABLE));
+
+    p = opcode_short_semantics[opcode];
+    p = strstr(p, NEEDLE);
+    g_assert(p);
+    p += strlen(NEEDLE);
+    while (isspace(*p)) {
+        p++;
+    }
+    /* lower is always imm 0, upper always imm 1. */
+    if (islower(*p)) {
+        return 0;
+    } else if (isupper(*p)) {
+        return 1;
+    } else {
+        g_assert_not_reached();
+    }
+}
