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decoder

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ed
2026-09-04 22:24:45 -04:00
parent bfd02f4472
commit 6a456097ba
10 changed files with 3796 additions and 2 deletions
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code/8086/decoder.h
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#ifdef INTELLISENSE_DIRECTIVES
# pragma once
# include "dsl.h"
# include "encoder.h"
# include "info.h"
#endif
enum {
X8616_OPERAND_SOURCE_COUNT = 0x10,
X8616_DECODE_BODY_CAP = 0x06,
X8616_DECODE_BODY_PAD = 0x02,
};
typedef Enum_(U2, X8616_DecodedOperandFlags) {
x8616_decoded_operand_none = 0b0000000000000000,
x8616_decoded_operand_register = 0b0000000000000001,
x8616_decoded_operand_segment = 0b0000000000000010,
x8616_decoded_operand_memory = 0b0000000000000100,
x8616_decoded_operand_immediate = 0b0000000000001000,
x8616_decoded_operand_relative = 0b0000000000010000,
x8616_decoded_operand_far_ptr = 0b0000000000100000,
x8616_decoded_operand_direct = 0b0000000001000000,
x8616_decoded_operand_sign_extended = 0b0000000010000000,
x8616_decoded_operand_implicit = 0b0000000100000000,
};
typedef Struct_(X8616_DecodedOperand) {
X8616_DecodedOperandFlags flags;
X8616_WidthMode width;
U1 reg;
U1 segment;
U1 mod;
U1 ea;
S2 displacement;
U2 address;
U2 immediate;
U2 far_offset;
U2 far_segment;
U1 displacement_bytes;
U1 immediate_bytes;
};
typedef Struct_(X8616_DecodedPrefixes) {
U1 count;
B1 lock;
B1 has_repeat;
X8616_Repeat repeat;
B1 has_segment;
X8616_Segment segment;
};
typedef Enum_(U1, X8616_DecodeFlags) {
x8616_decode_none = 0b00000000,
x8616_decode_invalid = 0b00000001,
x8616_decode_truncated = 0b00000010,
};
typedef Struct_(X8616_DecodedInstruction) {
X8616_Op op;
X8616_EncodingFlags flags;
X8616_DecodeFlags decode_flags;
X8616_WidthMode width;
X8616_DecodedPrefixes prefixes;
X8616_DecodedOperand operands[2];
U1 operand_count;
U1 opcode;
U1 mod_rm;
B1 has_mod_rm;
U1 size;
U1 size_required;
};
typedef Enum_(U2, X8616_DecodePlanFlags) {
x8616_plan_none = 0b0000000000000000,
x8616_plan_has_modrm = 0b0000000000000001,
x8616_plan_has_post_opcode = 0b0000000000000010,
x8616_plan_has_d = 0b0000000000000100,
x8616_plan_has_w = 0b0000000000001000,
x8616_plan_has_s = 0b0000000000010000,
x8616_plan_has_v = 0b0000000000100000,
x8616_plan_has_z = 0b0000000001000000,
x8616_plan_has_reg = 0b0000000010000000,
x8616_plan_has_sr = 0b0000000100000000,
x8616_plan_uses_rm = 0b0000001000000000,
x8616_plan_is_prefix = 0b0000010000000000,
};
typedef Enum_(U1, X8616_DecodePayload) {
x8616_payload_none = 0x0,
x8616_payload_imm = 0x1,
x8616_payload_imm8 = 0x2,
x8616_payload_imm16 = 0x3,
x8616_payload_mem_direct = 0x4,
x8616_payload_rel8 = 0x5,
x8616_payload_rel16 = 0x6,
x8616_payload_far_ptr = 0x7,
};
typedef Enum_(U1, X8616_DecodePrefixKind) {
x8616_prefix_none = 0x0,
x8616_prefix_lock = 0x1,
x8616_prefix_repeat = 0x2,
x8616_prefix_segment = 0x3,
};
typedef Struct_(X8616_DecodePlan) {
X8616_DecodePlanFlags flags;
X8616_Op op;
X8616_EncodingFlags encoding_flags;
X8616_WidthMode width;
X8616_Operand operands[2];
U1 operand_count;
X8616_DecodePayload payload;
X8616_DecodePrefixKind prefix_kind;
U1 d_shift;
U1 w_shift;
U1 s_shift;
U1 v_shift;
U1 z_shift;
U1 reg_shift;
U1 sr_shift;
X8616_BytePattern mod_rm;
X8616_BytePattern post_opcode;
};
enum {
X8616_DECODE_PLAN_INVALID = 0x00,
X8616_DECODE_AUX_BIT = 0x8000,
X8616_DECODE_AUX_MASK = 0x7FFF,
};
typedef Struct_(X8616_DecodeRequest) {
U1 const* source;
U4 source_size;
X8616_DecodedInstruction* instructions;
U4 instruction_capacity;
FArena* info_arena;
};
typedef Struct_(X8616_DecodeInfo) {
U4 source_consumed;
U4 instruction_count;
U4 instruction_capacity;
X8616_InfoList msgs;
};
X8616_DecodeInfo x8616_decode(X8616_DecodeRequest request);
typedef Struct_(X8616_DecodeOneInfo) {
X8616_DecodedInstruction instruction;
X8616_InfoList msgs;
U4 source_consumed;
};
X8616_DecodeOneInfo x8616_decode_one(U1_R source, U4 source_size, FArena_R info_arena);