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llvm-project/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h

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/*===- X86DisassemblerDecoderInternal.h - Disassembler decoder -----*- C -*-==*
*
* The LLVM Compiler Infrastructure
*
* This file is distributed under the University of Illinois Open Source
* License. See LICENSE.TXT for details.
*
*===----------------------------------------------------------------------===*
*
* This file is part of the X86 Disassembler.
* It contains the public interface of the instruction decoder.
* Documentation for the disassembler can be found in X86Disassembler.h.
*
*===----------------------------------------------------------------------===*/
#ifndef X86DISASSEMBLERDECODER_H
#define X86DISASSEMBLERDECODER_H
#ifdef __cplusplus
extern "C" {
#endif
#define INSTRUCTION_SPECIFIER_FIELDS \
const char* name;
#define INSTRUCTION_IDS \
InstrUID* instructionIDs;
#include "X86DisassemblerDecoderCommon.h"
#undef INSTRUCTION_SPECIFIER_FIELDS
#undef INSTRUCTION_IDS
/*
* Accessor functions for various fields of an Intel instruction
*/
#define modFromModRM(modRM) ((modRM & 0xc0) >> 6)
#define regFromModRM(modRM) ((modRM & 0x38) >> 3)
#define rmFromModRM(modRM) (modRM & 0x7)
#define scaleFromSIB(sib) ((sib & 0xc0) >> 6)
#define indexFromSIB(sib) ((sib & 0x38) >> 3)
#define baseFromSIB(sib) (sib & 0x7)
#define wFromREX(rex) ((rex & 0x8) >> 3)
#define rFromREX(rex) ((rex & 0x4) >> 2)
#define xFromREX(rex) ((rex & 0x2) >> 1)
#define bFromREX(rex) (rex & 0x1)
/*
* These enums represent Intel registers for use by the decoder.
*/
#define REGS_8BIT \
ENTRY(AL) \
ENTRY(CL) \
ENTRY(DL) \
ENTRY(BL) \
ENTRY(AH) \
ENTRY(CH) \
ENTRY(DH) \
ENTRY(BH) \
ENTRY(R8B) \
ENTRY(R9B) \
ENTRY(R10B) \
ENTRY(R11B) \
ENTRY(R12B) \
ENTRY(R13B) \
ENTRY(R14B) \
ENTRY(R15B) \
ENTRY(SPL) \
ENTRY(BPL) \
ENTRY(SIL) \
ENTRY(DIL)
#define EA_BASES_16BIT \
ENTRY(BX_SI) \
ENTRY(BX_DI) \
ENTRY(BP_SI) \
ENTRY(BP_DI) \
ENTRY(SI) \
ENTRY(DI) \
ENTRY(BP) \
ENTRY(BX) \
ENTRY(R8W) \
ENTRY(R9W) \
ENTRY(R10W) \
ENTRY(R11W) \
ENTRY(R12W) \
ENTRY(R13W) \
ENTRY(R14W) \
ENTRY(R15W)
#define REGS_16BIT \
ENTRY(AX) \
ENTRY(CX) \
ENTRY(DX) \
ENTRY(BX) \
ENTRY(SP) \
ENTRY(BP) \
ENTRY(SI) \
ENTRY(DI) \
ENTRY(R8W) \
ENTRY(R9W) \
ENTRY(R10W) \
ENTRY(R11W) \
ENTRY(R12W) \
ENTRY(R13W) \
ENTRY(R14W) \
ENTRY(R15W)
#define EA_BASES_32BIT \
ENTRY(EAX) \
ENTRY(ECX) \
ENTRY(EDX) \
ENTRY(EBX) \
ENTRY(sib) \
ENTRY(EBP) \
ENTRY(ESI) \
ENTRY(EDI) \
ENTRY(R8D) \
ENTRY(R9D) \
ENTRY(R10D) \
ENTRY(R11D) \
ENTRY(R12D) \
ENTRY(R13D) \
ENTRY(R14D) \
ENTRY(R15D)
#define REGS_32BIT \
ENTRY(EAX) \
ENTRY(ECX) \
ENTRY(EDX) \
ENTRY(EBX) \
ENTRY(ESP) \
ENTRY(EBP) \
ENTRY(ESI) \
ENTRY(EDI) \
ENTRY(R8D) \
ENTRY(R9D) \
ENTRY(R10D) \
ENTRY(R11D) \
ENTRY(R12D) \
ENTRY(R13D) \
ENTRY(R14D) \
ENTRY(R15D)
#define EA_BASES_64BIT \
ENTRY(RAX) \
ENTRY(RCX) \
ENTRY(RDX) \
ENTRY(RBX) \
ENTRY(sib64) \
ENTRY(RBP) \
ENTRY(RSI) \
ENTRY(RDI) \
ENTRY(R8) \
ENTRY(R9) \
ENTRY(R10) \
ENTRY(R11) \
ENTRY(R12) \
ENTRY(R13) \
ENTRY(R14) \
ENTRY(R15)
#define REGS_64BIT \
ENTRY(RAX) \
ENTRY(RCX) \
ENTRY(RDX) \
ENTRY(RBX) \
ENTRY(RSP) \
ENTRY(RBP) \
ENTRY(RSI) \
ENTRY(RDI) \
ENTRY(R8) \
ENTRY(R9) \
ENTRY(R10) \
ENTRY(R11) \
ENTRY(R12) \
ENTRY(R13) \
ENTRY(R14) \
ENTRY(R15)
#define REGS_MMX \
ENTRY(MM0) \
ENTRY(MM1) \
ENTRY(MM2) \
ENTRY(MM3) \
ENTRY(MM4) \
ENTRY(MM5) \
ENTRY(MM6) \
ENTRY(MM7)
#define REGS_XMM \
ENTRY(XMM0) \
ENTRY(XMM1) \
ENTRY(XMM2) \
ENTRY(XMM3) \
ENTRY(XMM4) \
ENTRY(XMM5) \
ENTRY(XMM6) \
ENTRY(XMM7) \
ENTRY(XMM8) \
ENTRY(XMM9) \
ENTRY(XMM10) \
ENTRY(XMM11) \
ENTRY(XMM12) \
ENTRY(XMM13) \
ENTRY(XMM14) \
ENTRY(XMM15)
#define REGS_SEGMENT \
ENTRY(ES) \
ENTRY(CS) \
ENTRY(SS) \
ENTRY(DS) \
ENTRY(FS) \
ENTRY(GS)
#define REGS_DEBUG \
ENTRY(DR0) \
ENTRY(DR1) \
ENTRY(DR2) \
ENTRY(DR3) \
ENTRY(DR4) \
ENTRY(DR5) \
ENTRY(DR6) \
ENTRY(DR7)
#define REGS_CONTROL \
ENTRY(CR0) \
ENTRY(CR1) \
ENTRY(CR2) \
ENTRY(CR3) \
ENTRY(CR4) \
ENTRY(CR5) \
ENTRY(CR6) \
ENTRY(CR7) \
ENTRY(CR8)
#define ALL_EA_BASES \
EA_BASES_16BIT \
EA_BASES_32BIT \
EA_BASES_64BIT
#define ALL_SIB_BASES \
REGS_32BIT \
REGS_64BIT
#define ALL_REGS \
REGS_8BIT \
REGS_16BIT \
REGS_32BIT \
REGS_64BIT \
REGS_MMX \
REGS_XMM \
REGS_SEGMENT \
REGS_DEBUG \
REGS_CONTROL \
ENTRY(RIP)
/*
* EABase - All possible values of the base field for effective-address
* computations, a.k.a. the Mod and R/M fields of the ModR/M byte. We
* distinguish between bases (EA_BASE_*) and registers that just happen to be
* referred to when Mod == 0b11 (EA_REG_*).
*/
typedef enum {
EA_BASE_NONE,
#define ENTRY(x) EA_BASE_##x,
ALL_EA_BASES
#undef ENTRY
#define ENTRY(x) EA_REG_##x,
ALL_REGS
#undef ENTRY
EA_max
} EABase;
/*
* SIBIndex - All possible values of the SIB index field.
* Borrows entries from ALL_EA_BASES with the special case that
* sib is synonymous with NONE.
*/
typedef enum {
SIB_INDEX_NONE,
#define ENTRY(x) SIB_INDEX_##x,
ALL_EA_BASES
#undef ENTRY
SIB_INDEX_max
} SIBIndex;
/*
* SIBBase - All possible values of the SIB base field.
*/
typedef enum {
SIB_BASE_NONE,
#define ENTRY(x) SIB_BASE_##x,
ALL_SIB_BASES
#undef ENTRY
SIB_BASE_max
} SIBBase;
/*
* EADisplacement - Possible displacement types for effective-address
* computations.
*/
typedef enum {
EA_DISP_NONE,
EA_DISP_8,
EA_DISP_16,
EA_DISP_32
} EADisplacement;
/*
* Reg - All possible values of the reg field in the ModR/M byte.
*/
typedef enum {
#define ENTRY(x) MODRM_REG_##x,
ALL_REGS
#undef ENTRY
MODRM_REG_max
} Reg;
/*
* SegmentOverride - All possible segment overrides.
*/
typedef enum {
SEG_OVERRIDE_NONE,
SEG_OVERRIDE_CS,
SEG_OVERRIDE_SS,
SEG_OVERRIDE_DS,
SEG_OVERRIDE_ES,
SEG_OVERRIDE_FS,
SEG_OVERRIDE_GS,
SEG_OVERRIDE_max
} SegmentOverride;
typedef uint8_t BOOL;
/*
* byteReader_t - Type for the byte reader that the consumer must provide to
* the decoder. Reads a single byte from the instruction's address space.
* @param arg - A baton that the consumer can associate with any internal
* state that it needs.
* @param byte - A pointer to a single byte in memory that should be set to
* contain the value at address.
* @param address - The address in the instruction's address space that should
* be read from.
* @return - -1 if the byte cannot be read for any reason; 0 otherwise.
*/
typedef int (*byteReader_t)(void* arg, uint8_t* byte, uint64_t address);
/*
* dlog_t - Type for the logging function that the consumer can provide to
* get debugging output from the decoder.
* @param arg - A baton that the consumer can associate with any internal
* state that it needs.
* @param log - A string that contains the message. Will be reused after
* the logger returns.
*/
typedef void (*dlog_t)(void* arg, const char *log);
/*
* The x86 internal instruction, which is produced by the decoder.
*/
struct InternalInstruction {
/* Reader interface (C) */
byteReader_t reader;
/* Opaque value passed to the reader */
void* readerArg;
/* The address of the next byte to read via the reader */
uint64_t readerCursor;
/* Logger interface (C) */
dlog_t dlog;
/* Opaque value passed to the logger */
void* dlogArg;
/* General instruction information */
/* The mode to disassemble for (64-bit, protected, real) */
DisassemblerMode mode;
/* The start of the instruction, usable with the reader */
uint64_t startLocation;
/* The length of the instruction, in bytes */
size_t length;
/* Prefix state */
/* 1 if the prefix byte corresponding to the entry is present; 0 if not */
uint8_t prefixPresent[0x100];
/* contains the location (for use with the reader) of the prefix byte */
uint64_t prefixLocations[0x100];
/* The value of the REX prefix, if present */
uint8_t rexPrefix;
/* The location of the REX prefix */
uint64_t rexLocation;
/* The location where a mandatory prefix would have to be (i.e., right before
the opcode, or right before the REX prefix if one is present) */
uint64_t necessaryPrefixLocation;
/* The segment override type */
SegmentOverride segmentOverride;
/* Sizes of various critical pieces of data */
uint8_t registerSize;
uint8_t addressSize;
uint8_t displacementSize;
uint8_t immediateSize;
/* opcode state */
/* The value of the two-byte escape prefix (usually 0x0f) */
uint8_t twoByteEscape;
/* The value of the three-byte escape prefix (usually 0x38 or 0x3a) */
uint8_t threeByteEscape;
/* The last byte of the opcode, not counting any ModR/M extension */
uint8_t opcode;
/* The ModR/M byte of the instruction, if it is an opcode extension */
uint8_t modRMExtension;
/* decode state */
/* The type of opcode, used for indexing into the array of decode tables */
OpcodeType opcodeType;
/* The instruction ID, extracted from the decode table */
uint16_t instructionID;
/* The specifier for the instruction, from the instruction info table */
struct InstructionSpecifier* spec;
/* state for additional bytes, consumed during operand decode. Pattern:
consumed___ indicates that the byte was already consumed and does not
need to be consumed again */
/* The ModR/M byte, which contains most register operands and some portion of
all memory operands */
BOOL consumedModRM;
uint8_t modRM;
/* The SIB byte, used for more complex 32- or 64-bit memory operands */
BOOL consumedSIB;
uint8_t sib;
/* The displacement, used for memory operands */
BOOL consumedDisplacement;
int32_t displacement;
/* Immediates. There can be two in some cases */
uint8_t numImmediatesConsumed;
uint8_t numImmediatesTranslated;
uint64_t immediates[2];
/* A register or immediate operand encoded into the opcode */
BOOL consumedOpcodeModifier;
uint8_t opcodeModifier;
Reg opcodeRegister;
/* Portions of the ModR/M byte */
/* These fields determine the allowable values for the ModR/M fields, which
depend on operand and address widths */
EABase eaBaseBase;
EABase eaRegBase;
Reg regBase;
/* The Mod and R/M fields can encode a base for an effective address, or a
register. These are separated into two fields here */
EABase eaBase;
EADisplacement eaDisplacement;
/* The reg field always encodes a register */
Reg reg;
/* SIB state */
SIBIndex sibIndex;
uint8_t sibScale;
SIBBase sibBase;
};
/* decodeInstruction - Decode one instruction and store the decoding results in
* a buffer provided by the consumer.
* @param insn - The buffer to store the instruction in. Allocated by the
* consumer.
* @param reader - The byteReader_t for the bytes to be read.
* @param readerArg - An argument to pass to the reader for storing context
* specific to the consumer. May be NULL.
* @param logger - The dlog_t to be used in printing status messages from the
* disassembler. May be NULL.
* @param loggerArg - An argument to pass to the logger for storing context
* specific to the logger. May be NULL.
* @param startLoc - The address (in the reader's address space) of the first
* byte in the instruction.
* @param mode - The mode (16-bit, 32-bit, 64-bit) to decode in.
* @return - Nonzero if there was an error during decode, 0 otherwise.
*/
int decodeInstruction(struct InternalInstruction* insn,
byteReader_t reader,
void* readerArg,
dlog_t logger,
void* loggerArg,
uint64_t startLoc,
DisassemblerMode mode);
/* x86DisassemblerDebug - C-accessible function for printing a message to
* debugs()
* @param file - The name of the file printing the debug message.
* @param line - The line number that printed the debug message.
* @param s - The message to print.
*/
void x86DisassemblerDebug(const char *file,
unsigned line,
const char *s);
#ifdef __cplusplus
}
#endif
#endif
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