tcg: Add tci disassembler

Signed-off-by: Stefan Weil <sw@weilnetz.de>

1 files changed, 59 insertions, 0 deletions

diff --git a/tci-dis.c b/tci-dis.c
new file mode 100644
index 0000000..10c411b
--- /dev/null
+++ b/tci-dis.c
@@ -0,0 +1,59 @@
+/*
+ * Tiny Code Interpreter for QEMU - disassembler
+ *
+ * Copyright (c) 2011 Stefan Weil
+ *
+ * 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/>.
+ */
+
+#include "dis-asm.h"
+#include "tcg/tcg.h"
+
+/* Disassemble TCI bytecode. */
+int print_insn_tci(bfd_vma addr, disassemble_info *info)
+{
+    int length;
+    uint8_t byte;
+    int status;
+    TCGOpcode op;
+
+    status = info->read_memory_func(addr, &byte, 1, info);
+    if (status != 0) {
+        info->memory_error_func(status, addr, info);
+        return -1;
+    }
+    op = byte;
+
+    addr++;
+    status = info->read_memory_func(addr, &byte, 1, info);
+    if (status != 0) {
+        info->memory_error_func(status, addr, info);
+        return -1;
+    }
+    length = byte;
+
+    if (op >= tcg_op_defs_max) {
+        info->fprintf_func(info->stream, "illegal opcode %d", op);
+    } else {
+        const TCGOpDef *def = &tcg_op_defs[op];
+        int nb_oargs = def->nb_oargs;
+        int nb_iargs = def->nb_iargs;
+        int nb_cargs = def->nb_cargs;
+        /* TODO: Improve disassembler output. */
+        info->fprintf_func(info->stream, "%s\to=%d i=%d c=%d",
+                           def->name, nb_oargs, nb_iargs, nb_cargs);
+    }
+
+    return length;
+}