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ed
2026-09-09 16:04:16 -04:00
parent 21334b48d8
commit 8912f3e0e9
6 changed files with 284 additions and 477 deletions
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code/8086/decoder.c
+20 -20
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@@ -35,7 +35,7 @@ typedef Struct_(X8616_DecodePlex) {
U1 plan_idx;
X8616_DecodePlan* plan;
U1 opcode;
U1 header;
U1 post_opcode;
U1 mod_rm;
@@ -82,8 +82,8 @@ typedef Struct_(X8616_DecodePlex) {
FI_ U2 x8616_decode_u2(U1_R bytes) { return C_(U2, bytes[0] | u2_(bytes[1] << 8)); }
internal X8616_OpcodePrefix
x8616_decode_opcode(X8616_DecodePlan const* plan, U1 opcode)
internal X8616_Opcode
x8616_decode_opcode(X8616_DecodePlan const* plan, U1 header)
{
U1 field_mask = 0;
if (plan->flags & x8616_plan_has_d) field_mask |= x8616_field_mask(plan->d_shift, X8616_OPCODE_BIT_WIDTH);
@@ -97,9 +97,9 @@ x8616_decode_opcode(X8616_DecodePlan const* plan, U1 opcode)
if (plan->flags & x8616_plan_has_cc) field_mask |= x8616_field_mask(plan->cc_shift, X8616_OPCODE_CC_WIDTH);
if (plan->flags & x8616_plan_has_pair) field_mask |= x8616_field_mask(plan->pair_shift, X8616_OPCODE_PAIR_WIDTH);
if (field_mask == 0) return 0;
U1 stem_mask = u1_(~field_mask);
if (stem_mask == 0) return 0;
return C_(X8616_OpcodePrefix, (opcode & stem_mask) >> count_trailing_zeros_u4(stem_mask));
U1 opcode_mask = u1_(~field_mask);
if (opcode_mask == 0) return 0;
return C_(X8616_Opcode, (header & opcode_mask) >> count_trailing_zeros_u4(opcode_mask));
}
internal void
@@ -141,8 +141,8 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
for (U1 idx = 0; idx < plex->body_available; ++ idx) plex->body[idx] = plex->source[prefix_at + idx];
plex->opcode = plex->body[0];
plex->dispatch = x8616_decode_dispatch[plex->opcode];
plex->header = plex->body[0];
plex->dispatch = x8616_decode_dispatch[plex->header];
if (body_source_size == 0) {
plex->classification_truncated = 1;
@@ -192,7 +192,7 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
, plex->source_offset + prefix_at
, 1
, 0
, plex->opcode
, plex->header
);
}
}
@@ -256,13 +256,13 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
}
X8616_DecodePlan_R plan = plex->plan;
plex->d = C_(X8616_Direction, x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->d_shift, X8616_OPCODE_BIT_WIDTH }));
plex->w = C_(X8616_Width, x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->w_shift, X8616_OPCODE_BIT_WIDTH }));
plex->s = C_(X8616_Sign, x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->s_shift, X8616_OPCODE_BIT_WIDTH }));
plex->v = C_(X8616_VariableShift, x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->v_shift, X8616_OPCODE_BIT_WIDTH }));
plex->z = C_(X8616_Repeat, x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->z_shift, X8616_OPCODE_BIT_WIDTH }));
plex->reg_opcode.r16 = C_(X8616_Reg16, x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->reg_shift, X8616_OPCODE_REG_REG_WIDTH }));
plex->sr_opcode = C_(X8616_Segment, x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->sr_shift, X8616_OPCODE_SR_WIDTH }));
plex->d = C_(X8616_Direction, x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->d_shift, X8616_OPCODE_BIT_WIDTH }));
plex->w = C_(X8616_Width, x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->w_shift, X8616_OPCODE_BIT_WIDTH }));
plex->s = C_(X8616_Sign, x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->s_shift, X8616_OPCODE_BIT_WIDTH }));
plex->v = C_(X8616_VariableShift, x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->v_shift, X8616_OPCODE_BIT_WIDTH }));
plex->z = C_(X8616_Repeat, x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->z_shift, X8616_OPCODE_BIT_WIDTH }));
plex->reg_opcode.r16 = C_(X8616_Reg16, x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->reg_shift, X8616_OPCODE_REG_REG_WIDTH }));
plex->sr_opcode = C_(X8616_Segment, x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->sr_shift, X8616_OPCODE_SR_WIDTH }));
plex->width = plan->width;
if (plex->width == x8616_width_dynamic && (plan->flags & x8616_plan_has_w))
@@ -285,10 +285,10 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
}
if (plan->flags & x8616_plan_has_alu) {
plex->alu = C_(X8616_ALU, x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->alu_shift, X8616_OPCODE_ALU_TTT_WIDTH }));
plex->alu = C_(X8616_ALU, x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->alu_shift, X8616_OPCODE_ALU_TTT_WIDTH }));
}
if (plan->flags & x8616_plan_has_cc) {
plex->cc = C_(X8616_Condition, x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->cc_shift, X8616_OPCODE_CC_WIDTH }));
plex->cc = C_(X8616_Condition, x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->cc_shift, X8616_OPCODE_CC_WIDTH }));
}
plex->displacement_at = plex->body_at;
@@ -445,7 +445,7 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
else if (plan->digit_kind == x8616_digit_incdec) plex->instruction.op = x8616_op_from_incdec[digit];
}
if (plan->flags & x8616_plan_has_pair) {
U1 bit = x8616_bit_field_extract(plex->opcode, (X8616_BitField){ plan->pair_shift, X8616_OPCODE_PAIR_WIDTH });
U1 bit = x8616_bit_field_extract(plex->header, (X8616_BitField){ plan->pair_shift, X8616_OPCODE_PAIR_WIDTH });
if (plan->pair_kind == x8616_pair_incdec) plex->instruction.op = x8616_op_from_incdec[bit];
if (plan->pair_kind == x8616_pair_pushpop) plex->instruction.op = x8616_op_from_pushpop[bit];
}
@@ -454,7 +454,7 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
plex->instruction.width = plex->width;
plex->instruction.prefixes = plex->prefixes;
plex->instruction.operand_count = plan->operand_count;
plex->instruction.opcode = x8616_decode_opcode(plan, plex->opcode);
plex->instruction.opcode = x8616_decode_opcode(plan, plex->header);
plex->instruction.d = (plan->flags & x8616_plan_has_d) ? plex->d : x8616_d_rm_dst;
plex->instruction.w = (plan->flags & x8616_plan_has_w) ? plex->w : x8616_w_byte;
plex->instruction.has_mod_rm = (plan->flags & x8616_plan_has_modrm) != 0;