1 files changed, 105 insertions, 0 deletions
diff --git a/js/src/zydis/Zydis/Disassembler.c b/js/src/zydis/Zydis/Disassembler.c
new file mode 100644
index 0000000000..c0e778b9d2
--- /dev/null
+++ b/js/src/zydis/Zydis/Disassembler.c
@@ -0,0 +1,105 @@
+/***************************************************************************************************
+
+  Zyan Disassembler Library (Zydis)
+
+  Original Author : Joel Hoener
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+
+***************************************************************************************************/
+
+#include "zydis/Zydis/Disassembler.h"
+#include "zydis/Zycore/LibC.h"
+
+/* ============================================================================================== */
+/* Internal helpers                                                                               */
+/* ============================================================================================== */
+
+static ZyanStatus ZydisDisassemble(ZydisMachineMode machine_mode,
+    ZyanU64 runtime_address, const void* buffer, ZyanUSize length,
+    ZydisDisassembledInstruction *instruction, ZydisFormatterStyle style)
+{
+    if (!buffer || !instruction)
+    {
+        return ZYAN_STATUS_INVALID_ARGUMENT;
+    }
+
+    *instruction = (ZydisDisassembledInstruction)
+    {
+      .runtime_address = runtime_address
+    };
+
+    // Derive the stack width from the address width.
+    ZydisStackWidth stack_width;
+    switch (machine_mode)
+    {
+    case ZYDIS_MACHINE_MODE_LONG_64:
+        stack_width = ZYDIS_STACK_WIDTH_64;
+        break;
+    case ZYDIS_MACHINE_MODE_LONG_COMPAT_32:
+    case ZYDIS_MACHINE_MODE_LEGACY_32:
+        stack_width = ZYDIS_STACK_WIDTH_32;
+        break;
+    case ZYDIS_MACHINE_MODE_LONG_COMPAT_16:
+    case ZYDIS_MACHINE_MODE_LEGACY_16:
+    case ZYDIS_MACHINE_MODE_REAL_16:
+        stack_width = ZYDIS_STACK_WIDTH_16;
+        break;
+    default:
+        return ZYAN_STATUS_INVALID_ARGUMENT;
+    }
+
+    ZydisDecoder decoder;
+    ZYAN_CHECK(ZydisDecoderInit(&decoder, machine_mode, stack_width));
+
+    ZydisDecoderContext ctx;
+    ZYAN_CHECK(ZydisDecoderDecodeInstruction(&decoder, &ctx, buffer, length, &instruction->info));
+    ZYAN_CHECK(ZydisDecoderDecodeOperands(&decoder, &ctx, &instruction->info,
+        instruction->operands, instruction->info.operand_count));
+
+    ZydisFormatter formatter;
+    ZYAN_CHECK(ZydisFormatterInit(&formatter, style));
+    ZYAN_CHECK(ZydisFormatterFormatInstruction(&formatter, &instruction->info,
+        instruction->operands, instruction->info.operand_count_visible, instruction->text,
+        sizeof(instruction->text), runtime_address, ZYAN_NULL));
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+/* ============================================================================================== */
+/* Public functions                                                                               */
+/* ============================================================================================== */
+
+ZyanStatus ZydisDisassembleIntel(ZydisMachineMode machine_mode,
+    ZyanU64 runtime_address, const void* buffer, ZyanUSize length,
+    ZydisDisassembledInstruction *instruction)
+{
+    return ZydisDisassemble(machine_mode, runtime_address, buffer, length, instruction,
+        ZYDIS_FORMATTER_STYLE_INTEL);
+}
+
+ZyanStatus ZydisDisassembleATT(ZydisMachineMode machine_mode,
+    ZyanU64 runtime_address, const void* buffer, ZyanUSize length,
+    ZydisDisassembledInstruction *instruction)
+{
+    return ZydisDisassemble(machine_mode, runtime_address, buffer, length, instruction,
+        ZYDIS_FORMATTER_STYLE_ATT);
+}
+
+/* ============================================================================================== */