#ifndef __VMM_EMULATE_H #define __VMM_EMULATE_H #ifdef __V3VEE__ #include "test.h" #include "vm_guest.h" typedef enum {INVALID_OPERAND, REG_OPERAND, MEM_OPERAND, IMM_OPERAND} operand_type_t; struct x86_operand { addr_t operand; uint_t size; operand_type_t type; }; 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 src_operand; struct x86_operand dst_operand; struct x86_operand third_operand; void * decoder_data; }; /************************/ /* 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_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); /* * JRL: Some of this was taken from the Xen sources... */ #define PACKED __attribute__((packed)) #define MODRM_MOD(x) ((x >> 6) & 0x3) #define MODRM_REG(x) ((x >> 3) & 0x7) #define MODRM_RM(x) (x & 0x7) struct modrm_byte { uint_t rm : 3 PACKED; uint_t reg : 3 PACKED; uint_t mod : 2 PACKED; }; #define SIB_BASE(x) ((x >> 6) & 0x3) #define SIB_INDEX(x) ((x >> 3) & 0x7) #define SIB_SCALE(x) (x & 0x7) struct sib_byte { uint_t base : 3 PACKED; uint_t index : 3 PACKED; uint_t scale : 2 PACKED; }; #define MAKE_INSTR(nm, ...) static const uchar_t V3_OPCODE_##nm[] = { __VA_ARGS__ } /* * Here's how it works: * First byte: Length. * Following bytes: Opcode bytes. * Special case: Last byte, if zero, doesn't need to match. */ MAKE_INSTR(INVD, 2, 0x0f, 0x08); MAKE_INSTR(CPUID, 2, 0x0f, 0xa2); MAKE_INSTR(RDMSR, 2, 0x0f, 0x32); MAKE_INSTR(WRMSR, 2, 0x0f, 0x30); MAKE_INSTR(RDTSC, 2, 0x0f, 0x31); MAKE_INSTR(RDTSCP, 3, 0x0f, 0x01, 0xf9); MAKE_INSTR(CLI, 1, 0xfa); MAKE_INSTR(STI, 1, 0xfb); MAKE_INSTR(RDPMC, 2, 0x0f, 0x33); MAKE_INSTR(CLGI, 3, 0x0f, 0x01, 0xdd); MAKE_INSTR(STGI, 3, 0x0f, 0x01, 0xdc); MAKE_INSTR(VMRUN, 3, 0x0f, 0x01, 0xd8); MAKE_INSTR(VMLOAD, 3, 0x0f, 0x01, 0xda); MAKE_INSTR(VMSAVE, 3, 0x0f, 0x01, 0xdb); MAKE_INSTR(VMCALL, 3, 0x0f, 0x01, 0xd9); MAKE_INSTR(PAUSE, 2, 0xf3, 0x90); MAKE_INSTR(SKINIT, 3, 0x0f, 0x01, 0xde); MAKE_INSTR(MOV2CR, 3, 0x0f, 0x22, 0x00); MAKE_INSTR(MOVCR2, 3, 0x0f, 0x20, 0x00); MAKE_INSTR(MOV2DR, 3, 0x0f, 0x23, 0x00); MAKE_INSTR(MOVDR2, 3, 0x0f, 0x21, 0x00); MAKE_INSTR(PUSHF, 1, 0x9c); MAKE_INSTR(POPF, 1, 0x9d); MAKE_INSTR(RSM, 2, 0x0f, 0xaa); MAKE_INSTR(INVLPG, 3, 0x0f, 0x01, 0x00); MAKE_INSTR(INVLPGA,3, 0x0f, 0x01, 0xdf); MAKE_INSTR(HLT, 1, 0xf4); MAKE_INSTR(CLTS, 2, 0x0f, 0x06); MAKE_INSTR(LMSW, 3, 0x0f, 0x01, 0x00); MAKE_INSTR(SMSW, 3, 0x0f, 0x01, 0x00); #define PREFIX_LOCK 0xF0 #define PREFIX_REPNE 0xF2 #define PREFIX_REPNZ 0xF2 #define PREFIX_REP 0xF3 #define PREFIX_REPE 0xF3 #define PREFIX_REPZ 0xF3 #define PREFIX_CS_OVERRIDE 0x2E #define PREFIX_SS_OVERRIDE 0x36 #define PREFIX_DS_OVERRIDE 0x3E #define PREFIX_ES_OVERRIDE 0x26 #define PREFIX_FS_OVERRIDE 0x64 #define PREFIX_GS_OVERRIDE 0x65 #define PREFIX_BR_NOT_TAKEN 0x2E #define PREFIX_BR_TAKEN 0x3E #define PREFIX_OP_SIZE 0x66 #define PREFIX_ADDR_SIZE 0x67 int opcode_cmp(const uchar_t * op1, const uchar_t * op2); static inline int is_prefix_byte(char byte) { switch (byte) { case 0xF0: // lock case 0xF2: // REPNE/REPNZ case 0xF3: // REP or REPE/REPZ case 0x2E: // CS override or Branch hint not taken (with Jcc instrs) case 0x36: // SS override case 0x3E: // DS override or Branch hint taken (with Jcc instrs) case 0x26: // ES override case 0x64: // FS override case 0x65: // GS override //case 0x2E: // branch not taken hint // case 0x3E: // branch taken hint case 0x66: // operand size override case 0x67: // address size override return 1; break; default: return 0; break; } } static inline v3_reg_t get_gpr_mask(struct guest_info * info) { switch (info->cpu_mode) { case REAL: return 0xffff; break; case PROTECTED: return 0xffffffff; default: V3_ASSERT(0); return 0; } } static inline addr_t get_addr_linear(struct guest_info * info, addr_t addr, struct v3_segment * seg) { switch (info->cpu_mode) { case REAL: // 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; default: V3_ASSERT(0); return 0; } } typedef enum {INVALID_ADDR_TYPE, REG, DISP0, DISP8, DISP16, DISP32} modrm_mode_t; typedef enum {INVALID_REG_SIZE, REG64, REG32, REG16, REG8} reg_size_t; struct v3_gprs; static inline addr_t decode_register(struct v3_gprs * gprs, char reg_code, reg_size_t reg_size) { addr_t reg_addr; switch (reg_code) { case 0: reg_addr = (addr_t)&(gprs->rax); break; case 1: reg_addr = (addr_t)&(gprs->rcx); break; case 2: reg_addr = (addr_t)&(gprs->rdx); break; case 3: reg_addr = (addr_t)&(gprs->rbx); break; case 4: if (reg_size == REG8) { reg_addr = (addr_t)&(gprs->rax) + 1; } else { reg_addr = (addr_t)&(gprs->rsp); } break; case 5: if (reg_size == REG8) { reg_addr = (addr_t)&(gprs->rcx) + 1; } else { reg_addr = (addr_t)&(gprs->rbp); } break; case 6: if (reg_size == REG8) { reg_addr = (addr_t)&(gprs->rdx) + 1; } else { reg_addr = (addr_t)&(gprs->rsi); } break; case 7: if (reg_size == REG8) { reg_addr = (addr_t)&(gprs->rbx) + 1; } else { reg_addr = (addr_t)&(gprs->rdi); } break; default: reg_addr = 0; break; } return reg_addr; } #endif // !__V3VEE__ #endif