-#ifndef __VMM_EMULATE_H
-#define __VMM_EMULATE_H
-#include <palacios/vm_guest.h>
-#include <palacios/vmm.h>
/*
- * This is where we do the hideous X86 instruction parsing among other things
- * We can parse out the instruction prefixes, as well as decode the operands
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National
+ * Science Foundation and the Department of Energy.
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico. You can find out more at
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
+ * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
+ * All rights reserved.
+ *
+ * Author: Jack Lange <jarusl@cs.northwestern.edu>
+ *
+ * This is free software. You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
*/
-typedef enum {INVALID_OPERAND, REG_OPERAND, MEM_OPERAND} operand_type_t;
+#ifndef __VMM_DECODER_H
+#define __VMM_DECODER_H
+
+#ifdef __V3VEE__
+#include <palacios/vm_guest.h>
+#include <palacios/vmm.h>
+typedef enum {INVALID_OPERAND, REG_OPERAND, MEM_OPERAND, IMM_OPERAND} operand_type_t;
struct x86_operand {
addr_t operand;
operand_type_t type;
};
-struct x86_prefix_list {
- uint_t lock : 1;
+struct x86_prefixes {
+ uint_t lock : 1; // 0xF0
+ uint_t repne : 1; // 0xF2
+ uint_t repnz : 1; // 0xF2
+ uint_t rep : 1; // 0xF3
+ uint_t repe : 1; // 0xF3
+ uint_t repz : 1; // 0xF3
+ uint_t cs_override : 1; // 0x2E
+ uint_t ss_override : 1; // 0x36
+ uint_t ds_override : 1; // 0x3E
+ uint_t es_override : 1; // 0x26
+ uint_t fs_override : 1; // 0x64
+ uint_t gs_override : 1; // 0x65
+ uint_t br_not_taken : 1; // 0x2E
+ uint_t br_takend : 1; // 0x3E
+ uint_t op_size : 1; // 0x66
+ uint_t addr_size : 1; // 0x67
+};
+
+
+struct x86_instr {
+ struct x86_prefixes prefixes;
+ uint_t instr_length;
+ addr_t opcode; // a pointer to the V3_OPCODE_[*] arrays defined below
+ uint_t num_operands;
+ struct x86_operand dst_operand;
+ struct x86_operand src_operand;
+ struct x86_operand third_operand;
+ void * decoder_data;
+};
+
+
+struct basic_instr_info {
+ uint_t instr_length;
+ uint_t op_size;
+ uint_t str_op : 1;
+ uint_t has_rep : 1;
};
-/* This parses an instruction
+
+
+ /************************/
+ /* EXTERNAL DECODER API */
+/************************/
+/*
+ This is an External API definition that must be implemented by a decoder
+*/
+
+
+/*
+ * Initializes a decoder
+ */
+int init_decoder();
+
+/*
+ * Decodes an instruction
* All addresses in arguments are in the host address space
+ * instr_ptr is the host address of the instruction
+ * IMPORTANT: make sure the instr_ptr is in contiguous host memory
+ * ie. Copy it to a buffer before the call
*/
-int v3_parse_instr(struct guest_info * info, // input
- char * instr_ptr, // input
- uint_t * instr_length, // output
- addr_t * opcode, // output
- uint_t * opcode_length, // output
- struct x86_prefix_list * prefixes, // output
- struct x86_operand * src_operand, // output
- struct x86_operand * dst_operand, // output
- struct x86_operand * extra_operand); // output
-
+int v3_decode(struct guest_info * info, addr_t instr_ptr, struct x86_instr * instr);
+
+/*
+ * Encodes an instruction
+ * All addresses in arguments are in the host address space
+ * The instruction is encoded from the struct, and copied into a 15 byte host buffer
+ * referenced by instr_buf
+ * any unused bytes at the end of instr_buf will be filled with nops
+ * IMPORTANT: instr_buf must be allocated and 15 bytes long
+ */
+int v3_encode(struct guest_info * info, struct x86_instr * instr, char * instr_buf);
+
+
+/*
+ * Gets the operand size for a memory operation
+ *
+ */
+int v3_basic_mem_decode(struct guest_info * info, addr_t instr_ptr, struct basic_instr_info * instr_info);
+
+
+
+/* Removes a rep prefix in place */
+void strip_rep_prefix(uchar_t * instr, int length);
+
/*
-#define MAKE_INSTR(nm, ...) static const uchar_t OPCODE_##nm[] = { __VA_ARGS__ }
+#define MAKE_INSTR(nm, ...) static const uchar_t V3_OPCODE_##nm[] = { __VA_ARGS__ }
/*
* Here's how it works:
#define PREFIX_OP_SIZE 0x66
#define PREFIX_ADDR_SIZE 0x67
-static inline int is_prefix_byte(char byte) {
+int opcode_cmp(const uchar_t * op1, const uchar_t * op2);
+
+
+static inline int is_prefix_byte(uchar_t byte) {
switch (byte) {
case 0xF0: // lock
case 0xF2: // REPNE/REPNZ
static inline addr_t get_addr_linear(struct guest_info * info, addr_t addr, struct v3_segment * seg) {
switch (info->cpu_mode) {
case REAL:
- return addr + (seg->selector << 4);
- break;
+ // It appears that the segment values are computed and cached in the vmcb structure
+ // We Need to check this for Intel
+ /* return addr + (seg->selector << 4);
+ break;*/
+
case PROTECTED:
return addr + seg->base;
break;
operand_type_t addr_type = INVALID_OPERAND;
char * instr_cursor = modrm_instr;
- PrintDebug("ModRM mod=%d\n", modrm->mod);
+ // PrintDebug("ModRM mod=%d\n", modrm->mod);
instr_cursor += 1;
if (modrm->mod == 3) {
mod_mode = REG;
addr_type = REG_OPERAND;
- PrintDebug("first operand = Register (RM=%d)\n",modrm->rm);
+ //PrintDebug("first operand = Register (RM=%d)\n",modrm->rm);
*first_operand = decode_register(gprs, modrm->rm, reg_size);
static inline operand_type_t decode_operands32(struct v3_gprs * gprs, // input/output
- char * modrm_instr, // input
+ uchar_t * modrm_instr, // input
int * offset, // output
addr_t * first_operand, // output
addr_t * second_operand, // output
reg_size_t reg_size) { // input
- char * instr_cursor = modrm_instr;
+ uchar_t * instr_cursor = modrm_instr;
struct modrm_byte * modrm = (struct modrm_byte *)modrm_instr;
addr_t base_addr = 0;
modrm_mode_t mod_mode = 0;
mod_mode = REG;
addr_type = REG_OPERAND;
- PrintDebug("first operand = Register (RM=%d)\n",modrm->rm);
+ // PrintDebug("first operand = Register (RM=%d)\n",modrm->rm);
*first_operand = decode_register(gprs, modrm->rm, reg_size);
+#endif // !__V3VEE__
+
#endif
