From 5826e51917525dac7704ba8f80d624578fdad3c8 Mon Sep 17 00:00:00 2001
From: Stefan Weil <sw@weilnetz.de>
Date: Wed, 5 Oct 2011 20:03:53 +0200
Subject: [PATCH] tcg: Add tci disassembler

Signed-off-by: Stefan Weil <sw@weilnetz.de>
---
 dis-asm.h |  1 +
 disas.c   |  4 +++-
 tci-dis.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 tci-dis.c

diff --git a/dis-asm.h b/dis-asm.h
index 5b07d7f3a..4f15fad4f 100644
--- a/dis-asm.h
+++ b/dis-asm.h
@@ -365,6 +365,7 @@ typedef struct disassemble_info {
    target address.  Return number of bytes processed.  */
 typedef int (*disassembler_ftype) (bfd_vma, disassemble_info *);
 
+int print_insn_tci(bfd_vma, disassemble_info*);
 int print_insn_big_mips         (bfd_vma, disassemble_info*);
 int print_insn_little_mips      (bfd_vma, disassemble_info*);
 int print_insn_i386             (bfd_vma, disassemble_info*);
diff --git a/disas.c b/disas.c
index 611b30b55..3b1fd977a 100644
--- a/disas.c
+++ b/disas.c
@@ -273,7 +273,9 @@ void disas(FILE *out, void *code, unsigned long size)
 #else
     disasm_info.endian = BFD_ENDIAN_LITTLE;
 #endif
-#if defined(__i386__)
+#if defined(CONFIG_TCG_INTERPRETER)
+    print_insn = print_insn_tci;
+#elif defined(__i386__)
     disasm_info.mach = bfd_mach_i386_i386;
     print_insn = print_insn_i386;
 #elif defined(__x86_64__)
diff --git a/tci-dis.c b/tci-dis.c
new file mode 100644
index 000000000..10c411be8
--- /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;
+}