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decoder seems to be working, need to make a serializer next.

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ed
2026-09-09 01:50:20 -04:00
parent 5e6e139cc0
commit 6cca3fbe8b
7 changed files with 116 additions and 67 deletions
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code/8086/decoder.c
+44 -26
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@@ -33,7 +33,7 @@ typedef Struct_(X8616_DecodePlex) {
U2 dispatch;
U1 plan_idx;
X8616_DecodePlan const* plan;
X8616_DecodePlan* plan;
U1 opcode;
U1 post_opcode;
@@ -80,6 +80,23 @@ 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)
{
U1 field_mask = 0;
if (plan->flags & x8616_plan_has_d) field_mask |= u1_(1u << plan->d_shift);
if (plan->flags & x8616_plan_has_w) field_mask |= u1_(1u << plan->w_shift);
if (plan->flags & x8616_plan_has_s) field_mask |= u1_(1u << plan->s_shift);
if (plan->flags & x8616_plan_has_v) field_mask |= u1_(1u << plan->v_shift);
if (plan->flags & x8616_plan_has_z) field_mask |= u1_(1u << plan->z_shift);
if (plan->flags & x8616_plan_has_reg) field_mask |= u1_(0b111u << plan->reg_shift);
if (plan->flags & x8616_plan_has_sr) field_mask |= u1_(0b11u << plan->sr_shift);
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));
}
internal void
x8616_decode_apply_prefix(X8616_DecodePlex_R plex, X8616_DecodePlan_R plan, U1 opcode) {
plex->prefixes.count += 1;
@@ -107,7 +124,7 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
U2 prefix_dispatch = x8616_decode_dispatch[prefix_opcode];
if (prefix_dispatch == false || (prefix_dispatch & X8616_DECODE_AUX_BIT)) break;
X8616_DecodePlan const* prefix_plan = x8616_decode_plans + prefix_dispatch;
X8616_DecodePlan_R prefix_plan = x8616_decode_plans + prefix_dispatch;
if ((prefix_plan->flags & x8616_plan_is_prefix) == false) break;
x8616_decode_apply_prefix(plex, prefix_plan, prefix_opcode);
@@ -228,7 +245,6 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
plex->instruction.prefixes = plex->prefixes;
plex->instruction.op = x8616_op_invalid;
plex->instruction.decode_flags = (plex->encoding_invalid ? x8616_decode_invalid : 0) | (plex->classification_truncated ? x8616_decode_truncated : 0);
plex->instruction.opcode = plex->opcode;
plex->instruction.size = u1_(prefix_at + invalid_body_size);
plex->instruction.size_required = plex->instruction.size;
return plex->instruction.size;
@@ -303,39 +319,39 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
X8616_DecodedOperand* source = plex->operand_source;
source[x8616_operand_reg_modrm].flags = x8616_decoded_operand_register;
source[x8616_operand_reg_modrm].width = plex->width;
source[x8616_operand_reg_modrm].reg = plex->reg;
source[x8616_operand_reg_modrm].flags = x8616_decoded_operand_register;
source[x8616_operand_reg_modrm].width = plex->width;
source[x8616_operand_reg_modrm].reg.r16 = C_(X8616_Reg16, plex->reg);
source[x8616_operand_reg_opcode].flags = x8616_decoded_operand_register;
source[x8616_operand_reg_opcode].width = plex->width;
source[x8616_operand_reg_opcode].reg = plex->reg_opcode;
source[x8616_operand_reg_opcode].flags = x8616_decoded_operand_register;
source[x8616_operand_reg_opcode].width = plex->width;
source[x8616_operand_reg_opcode].reg.r16 = C_(X8616_Reg16, plex->reg_opcode);
source[x8616_operand_segment_modrm].flags = x8616_decoded_operand_segment;
source[x8616_operand_segment_modrm].width = x8616_width_word;
source[x8616_operand_segment_modrm].segment = plex->sr_modrm;
source[x8616_operand_segment_modrm].segment = C_(X8616_Segment, plex->sr_modrm);
source[x8616_operand_segment_opcode].flags = x8616_decoded_operand_segment;
source[x8616_operand_segment_opcode].width = x8616_width_word;
source[x8616_operand_segment_opcode].segment = plex->sr_opcode;
source[x8616_operand_segment_opcode].segment = C_(X8616_Segment, plex->sr_opcode);
source[x8616_operand_acc].flags = x8616_decoded_operand_register | x8616_decoded_operand_implicit;
source[x8616_operand_acc].width = plex->width;
source[x8616_operand_acc].reg = 0;
source[x8616_operand_acc].flags = x8616_decoded_operand_register | x8616_decoded_operand_implicit;
source[x8616_operand_acc].width = plex->width;
source[x8616_operand_acc].reg.r16 = x8616_ax;
source[x8616_operand_dx].flags = x8616_decoded_operand_register | x8616_decoded_operand_implicit;
source[x8616_operand_dx].width = x8616_width_word;
source[x8616_operand_dx].reg = x8616_dx;
source[x8616_operand_dx].flags = x8616_decoded_operand_register | x8616_decoded_operand_implicit;
source[x8616_operand_dx].width = x8616_width_word;
source[x8616_operand_dx].reg.r16 = x8616_dx;
source[x8616_operand_rm].width = plex->width;
if (plex->mod == x8616_mod_reg) {
source[x8616_operand_rm].flags = x8616_decoded_operand_register;
source[x8616_operand_rm].reg = plex->rm;
source[x8616_operand_rm].flags = x8616_decoded_operand_register;
source[x8616_operand_rm].reg.r16 = C_(X8616_Reg16, plex->rm);
}
else {
source[x8616_operand_rm].flags = x8616_decoded_operand_memory;
source[x8616_operand_rm].mod = plex->mod;
source[x8616_operand_rm].ea = plex->rm;
source[x8616_operand_rm].mod = C_(X8616_Mod, plex->mod);
source[x8616_operand_rm].ea = C_(X8616_EA, plex->rm);
source[x8616_operand_rm].displacement = plex->displacement;
source[x8616_operand_rm].displacement_bytes = plex->displacement_bytes;
if (plex->direct_memory) {
@@ -382,7 +398,7 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
source[x8616_operand_shift_count].width = x8616_width_byte;
if (plex->v == x8616_v_cl) {
source[x8616_operand_shift_count].flags |= x8616_decoded_operand_register;
source[x8616_operand_shift_count].reg = x8616_cl;
source[x8616_operand_shift_count].reg.r8 = x8616_cl;
}
else {
source[x8616_operand_shift_count].flags |= x8616_decoded_operand_immediate;
@@ -400,10 +416,11 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
plex->instruction.decode_flags = (plex->encoding_invalid ? x8616_decode_invalid : 0) | (plex->classification_truncated ? x8616_decode_truncated : 0);
plex->instruction.width = plex->width;
plex->instruction.prefixes = plex->prefixes;
plex->instruction.operand_count = plan->operand_count;
plex->instruction.opcode = plex->opcode;
plex->instruction.mod_rm = plex->mod_rm;
plex->instruction.has_mod_rm = (plan->flags & x8616_plan_has_modrm) != 0;
plex->instruction.operand_count = plan->operand_count;
plex->instruction.opcode = x8616_decode_opcode(plan, plex->opcode);
plex->instruction.d = C_(X8616_Direction, (plan->flags & x8616_plan_has_d) ? plex->d : 0);
plex->instruction.w = C_(X8616_Width, (plan->flags & x8616_plan_has_w) ? plex->w : 0);
plex->instruction.has_mod_rm = (plan->flags & x8616_plan_has_modrm) != 0;
U4 total_required = prefix_at + plex->body_required;
U4 total_available = plex->source_size;
@@ -414,6 +431,7 @@ x8616_decode_one_plex(X8616_DecodePlex* plex)
return total_consumed;
}
#define x8616_decode_(...) x8616_decode((X8616_DecodeRequest){__VA_ARGS__})
X8616_DecodeInfo x8616_decode(X8616_DecodeRequest request)
{
X8616_DecodeInfo result = {0};