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decode: Store instruction descriptors separately

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This commit is contained in:
Alexis Engelke
2020-11-22 22:27:43 +01:00
parent bb8510d77f
commit fd80706f54
2 changed files with 40 additions and 27 deletions
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31
decode.c
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@@ -9,12 +9,6 @@
#define LIKELY(x) __builtin_expect((x), 1)
#define UNLIKELY(x) __builtin_expect((x), 0)
#define FD_DECODE_TABLE_DATA
static __attribute__((aligned(16))) const uint16_t _decode_table[] = {
#include <fadec-table.inc>
};
#undef FD_DECODE_TABLE_DATA
// Defines FD_TABLE_OFFSET_32 and FD_TABLE_OFFSET_64, if available
#define FD_DECODE_TABLE_DEFINES
#include <fadec-table.inc>
@@ -39,6 +33,11 @@ typedef enum DecodeMode DecodeMode;
static inline unsigned
table_walk(unsigned cur_idx, unsigned entry_idx, unsigned* out_kind) {
static __attribute__((aligned(16))) const uint16_t _decode_table[] = {
#define FD_DECODE_TABLE_DATA
#include <fadec-table.inc>
#undef FD_DECODE_TABLE_DATA
};
unsigned entry = _decode_table[cur_idx + entry_idx];
*out_kind = entry & ENTRY_MASK;
return (entry & ~ENTRY_MASK) >> 1;
@@ -181,8 +180,7 @@ decode_modrm(const uint8_t* buffer, int len, DecodeMode mode, FdInstr* instr,
struct InstrDesc
{
uint16_t type;
uint8_t operand_indices;
uint8_t immediate;
uint16_t operand_indices;
uint16_t operand_sizes;
uint16_t reg_types;
} __attribute__((packed));
@@ -195,11 +193,11 @@ struct InstrDesc
#define DESC_VEXREG_IDX(desc) ((((desc)->operand_indices >> 4) & 3) ^ 3)
#define DESC_HAS_IMPLICIT(desc) (((desc)->operand_indices & (3 << 6)) != 0)
#define DESC_IMPLICIT_IDX(desc) ((((desc)->operand_indices >> 6) & 3) ^ 3)
#define DESC_IMM_CONTROL(desc) (((desc)->immediate >> 4) & 0x7)
#define DESC_IMM_IDX(desc) (((desc)->immediate & 3) ^ 3)
#define DESC_IMPLICIT_VAL(desc) (((desc)->immediate >> 2) & 1)
#define DESC_LOCK(desc) (((desc)->immediate >> 3) & 1)
#define DESC_VSIB(desc) (((desc)->immediate >> 7) & 1)
#define DESC_IMM_CONTROL(desc) (((desc)->operand_indices >> 12) & 0x7)
#define DESC_IMM_IDX(desc) ((((desc)->operand_indices >> 8) & 3) ^ 3)
#define DESC_IMPLICIT_VAL(desc) (((desc)->operand_indices >> 10) & 1)
#define DESC_LOCK(desc) (((desc)->operand_indices >> 11) & 1)
#define DESC_VSIB(desc) (((desc)->operand_indices >> 15) & 1)
#define DESC_OPSIZE(desc) (((desc)->operand_sizes >> 8) & 3)
#define DESC_SIZE_FIX1(desc) (((desc)->operand_sizes >> 10) & 7)
#define DESC_SIZE_FIX2(desc) (((desc)->operand_sizes >> 13) & 3)
@@ -391,7 +389,12 @@ prefix_end:
if (UNLIKELY(kind != ENTRY_INSTR))
return kind == 0 ? FD_ERR_UD : FD_ERR_PARTIAL;
struct InstrDesc* desc = (struct InstrDesc*) &_decode_table[table_idx];
static __attribute__((aligned(16))) const struct InstrDesc descs[] = {
#define FD_DECODE_TABLE_DESCS
#include <fadec-table.inc>
#undef FD_DECODE_TABLE_DESCS
};
const struct InstrDesc* desc = &descs[table_idx >> 2];
instr->type = desc->type;
instr->flags = prefix_rep == 2 ? FD_FLAG_REP :