65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/*
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prefix.h
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diStorm3 - Powerful disassembler for X86/AMD64
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http://ragestorm.net/distorm/
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distorm at gmail dot com
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Copyright (C) 2003-2016 Gil Dabah
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This library is licensed under the BSD license. See the file COPYING.
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*/
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#ifndef PREFIX_H
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#define PREFIX_H
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#include "config.h"
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#include "decoder.h"
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/* Specifies the type of the extension prefix, such as: REX, 2 bytes VEX, 3 bytes VEX. */
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typedef enum {PET_NONE = 0, PET_REX, PET_VEX2BYTES, PET_VEX3BYTES} _PrefixExtType;
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/* Specifies an index into a table of prefixes by their type. */
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typedef enum {PFXIDX_NONE = -1, PFXIDX_REX, PFXIDX_LOREP, PFXIDX_SEG, PFXIDX_OP_SIZE, PFXIDX_ADRS, PFXIDX_MAX} _PrefixIndexer;
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/*
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* This holds the prefixes state for the current instruction we decode.
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* decodedPrefixes includes all specific prefixes that the instruction got.
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* start is a pointer to the first prefix to take into account.
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* last is a pointer to the last byte we scanned.
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* Other pointers are used to keep track of prefixes positions and help us know if they appeared already and where.
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*/
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typedef struct {
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_iflags decodedPrefixes, usedPrefixes;
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const uint8_t *start, *last, *vexPos, *rexPos;
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_PrefixExtType prefixExtType;
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uint16_t unusedPrefixesMask;
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/* Indicates whether the operand size prefix (0x66) was used as a mandatory prefix. */
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int isOpSizeMandatory;
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/* If VEX prefix is used, store the VEX.vvvv field. */
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unsigned int vexV;
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/* The fields B/X/R/W/L of REX and VEX are stored together in this byte. */
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unsigned int vrex;
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/* !! Make sure pfxIndexer is LAST! Otherwise memset won't work well with it. !! */
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/* Holds the offset to the prefix byte by its type. */
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int pfxIndexer[PFXIDX_MAX];
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} _PrefixState;
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/*
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* Intel supports 6 types of prefixes, whereas AMD supports 5 types (lock is seperated from rep/nz).
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* REX is the fifth prefix type, this time I'm based on AMD64.
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* VEX is the 6th, though it can't be repeated.
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*/
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#define MAX_PREFIXES (5)
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int prefixes_is_valid(unsigned int ch, _DecodeType dt);
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void prefixes_ignore(_PrefixState* ps, _PrefixIndexer pi);
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void prefixes_ignore_all(_PrefixState* ps);
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uint16_t prefixes_set_unused_mask(_PrefixState* ps);
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void prefixes_decode(const uint8_t* code, int codeLen, _PrefixState* ps, _DecodeType dt);
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void prefixes_use_segment(_iflags defaultSeg, _PrefixState* ps, _DecodeType dt, _DInst* di);
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#endif /* PREFIX_H */
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