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done for now, doing validation suite next.

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ed
2026-09-09 17:01:22 -04:00
parent 7daa333a71
commit 2a89a342df
7 changed files with 147 additions and 230 deletions
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code/8086/encoder.h
+22 -89
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@@ -11,12 +11,12 @@
Fields = d, w, s, v, z, reg, sr (Table 4-11). Packed into that same byte.
Header = byte 1 as stored: opcode bits sitting in position, field bits OR'd in.
BytePattern matches a header byte: .bits = opcode << field_width (fields zero),
.mask = bits of the header that are opcode. */
BytePattern matches a header byte: .bits = expected bits in position,
.mask = bits that must match (opcode bits, plus any fixed literals). */
typedef Struct_(X8616_BytePattern) { U1 bits; U1 mask; };
typedef Struct_(X8616_BitField) { U1 shift; U1 width; };
typedef Struct_(X8616_OpcodeFields) {
typedef Struct_(X8616_HeaderFields) {
X8616_BitField d;
X8616_BitField w;
X8616_BitField s;
@@ -26,7 +26,6 @@ typedef Struct_(X8616_OpcodeFields) {
X8616_BitField sr;
X8616_BitField alu;
X8616_BitField cc;
X8616_BitField pair;
};
#define x8616_field_mask(shift, width) u1_(((1u << (width)) - 1u) << (shift))
@@ -162,18 +161,9 @@ typedef Enum_(U1, X8616_EncodingFlags) {
};
typedef Enum_(U1, X8616_DigitKind) {
x8616_digit_none = 0x0,
x8616_digit_alu = 0x1,
x8616_digit_shift = 0x2,
x8616_digit_g3 = 0x3,
x8616_digit_ff = 0x4,
x8616_digit_incdec = 0x5,
};
typedef Enum_(U1, X8616_PairKind) {
x8616_pair_none = 0x0,
x8616_pair_incdec = 0x1,
x8616_pair_pushpop = 0x2,
x8616_digit_none = 0x0,
x8616_digit_alu = 0x1,
x8616_digit_shift = 0x2,
};
/* header: Byte 1 match (opcode bits aligned, field bits masked). Not the opcode.
@@ -188,12 +178,11 @@ typedef Struct_(X8616_Encoding) {
X8616_BytePattern header;
X8616_BytePattern mod_rm;
X8616_BytePattern post_opcode;
X8616_OpcodeFields fields;
X8616_HeaderFields fields;
X8616_Operand operands[2];
X8616_WidthMode width;
X8616_EncodingFlags flags;
X8616_DigitKind digit_kind;
X8616_PairKind pair_kind;
X8616_Op op;
};
@@ -345,43 +334,6 @@ RO_ global X8616_Op x8616_op_from_shift[] = {
[x8616_sar] = x8616_op_sar,
};
RO_ global X8616_Op x8616_op_from_g3[] = {
[x8616_g3_test] = x8616_op_test,
[0b001] = x8616_op_invalid,
[x8616_g3_not] = x8616_op_not,
[x8616_g3_neg] = x8616_op_neg,
[x8616_g3_mul] = x8616_op_mul,
[x8616_g3_imul] = x8616_op_imul,
[x8616_g3_div] = x8616_op_div,
[x8616_g3_idiv] = x8616_op_idiv,
};
RO_ global X8616_Op x8616_op_from_ff[] = {
[0b000] = x8616_op_invalid,
[0b001] = x8616_op_invalid,
[x8616_ff_call_near] = x8616_op_call,
[x8616_ff_call_far] = x8616_op_call,
[x8616_ff_jmp_near] = x8616_op_jmp,
[x8616_ff_jmp_far] = x8616_op_jmp,
[x8616_ff_push] = x8616_op_push,
[0b111] = x8616_op_invalid,
};
RO_ global X8616_Op x8616_op_from_incdec[] = {
[x8616_inc] = x8616_op_inc,
[x8616_dec] = x8616_op_dec,
};
typedef Enum_(U1, X8616_PushPop) {
x8616_pushpop_push = 0b0,
x8616_pushpop_pop = 0b1,
};
RO_ global X8616_Op x8616_op_from_pushpop[] = {
[x8616_pushpop_push] = x8616_op_push,
[x8616_pushpop_pop] = x8616_op_pop,
};
typedef Enum_(U1, X8616_Condition) {
x8616_cc_o = 0b0000,
x8616_cc_no = 0b0001,
@@ -632,19 +584,6 @@ enum {
X8616_OPCODE_ALU_RM_FORM = 0b0,
X8616_OPCODE_ALU_ACC_FORM = 0b10,
X8616_OPCODE_ALU_ACC_FORM_SHIFT = 1,
X8616_OPCODE_PAIR_SHIFT = 3,
X8616_OPCODE_PAIR_WIDTH = 1,
X8616_OPCODE_PAIR_REG_HOLE = X8616_OPCODE_PAIR_SHIFT + X8616_OPCODE_PAIR_WIDTH,
X8616_OPCODE_IO_CLASS = 0b1110,
X8616_OPCODE_IO_CLASS_SHIFT = 4,
X8616_OPCODE_IO_DX_SHIFT = 3,
X8616_OPCODE_IO_FIXED_SHIFT = 2,
X8616_OPCODE_IO_OUT_SHIFT = 1,
X8616_OPCODE_IO_FIXED_FORM = 0b10,
X8616_OPCODE_IO_CLASS_STEM_SHIFT = X8616_OPCODE_IO_CLASS_SHIFT - X8616_OPCODE_W_HOLE,
X8616_OPCODE_IO_DX_STEM_SHIFT = X8616_OPCODE_IO_DX_SHIFT - X8616_OPCODE_W_HOLE,
X8616_OPCODE_IO_OUT_STEM_SHIFT = X8616_OPCODE_IO_OUT_SHIFT - X8616_OPCODE_W_HOLE,
};
// ============================================================================
@@ -689,8 +628,8 @@ FI_ U1 x8616_modrm_sr (U1 modrm) { return (
#define x8616_enc_z(z) ((z) << X8616_OPCODE_Z_Z_SHIFT)
#define x8616_enc_width(w) ((w) << X8616_OPCODE_W_W_SHIFT)
#define x8616_enc_wreg_width(w) ((w) << X8616_OPCODE_WREG_W_SHIFT)
#define x8616_enc_opcode_reg(r) ((r) << X8616_OPCODE_REG_REG_SHIFT)
#define x8616_enc_opcode_sr(sr) ((sr) << X8616_OPCODE_SR_SHIFT)
#define x8616_enc_reg_field(r) ((r) << X8616_OPCODE_REG_REG_SHIFT)
#define x8616_enc_sr_field(sr) ((sr) << X8616_OPCODE_SR_SHIFT)
#define x8616_enc_cc(cc) ((cc) << X8616_OPCODE_CC_SHIFT)
#define x8616_enc_modrm_mod(mod) ((mod) << X8616_MODRM_MOD_SHIFT)
@@ -703,10 +642,10 @@ FI_ U1 x8616_modrm_sr (U1 modrm) { return (
#define x8616_enc_vw(opcode,v,w) C_(U1, x8616_enc_vw_opcode(opcode) | x8616_enc_v(v) | x8616_enc_width(w))
#define x8616_enc_zp(opcode,z) C_(U1, x8616_enc_z_opcode(opcode) | x8616_enc_z(z))
#define x8616_enc_w(opcode,w) C_(U1, x8616_enc_w_opcode(opcode) | x8616_enc_width(w))
#define x8616_enc_reg(opcode,reg) C_(U1, x8616_enc_reg_opcode(opcode) | x8616_enc_opcode_reg(reg))
#define x8616_enc_wreg(opcode,w,reg) C_(U1, x8616_enc_wreg_opcode(opcode) | x8616_enc_wreg_width(w) | x8616_enc_opcode_reg(reg))
#define x8616_enc_reg(opcode,reg) C_(U1, x8616_enc_reg_opcode(opcode) | x8616_enc_reg_field(reg))
#define x8616_enc_wreg(opcode,w,reg) C_(U1, x8616_enc_wreg_opcode(opcode) | x8616_enc_wreg_width(w) | x8616_enc_reg_field(reg))
#define x8616_enc_d0(opcode,d) C_(U1, x8616_enc_d0_opcode(opcode) | x8616_enc_d(d))
#define x8616_enc_sr(class,sr,low) C_(U1, ((class) << X8616_OPCODE_SR_CLASS_SHIFT) | x8616_enc_opcode_sr(sr) | (low))
#define x8616_enc_sr(class,sr,low) C_(U1, ((class) << X8616_OPCODE_SR_CLASS_SHIFT) | x8616_enc_sr_field(sr) | (low))
#define x8616_enc_jcc(cc) C_(U1, (x8616_opcode_jcc << X8616_OPCODE_CC_HOLE) | x8616_enc_cc(cc))
#define x8616_enc_modrm(mod,reg,rm) C_(U1, x8616_enc_modrm_mod(mod) | x8616_enc_modrm_reg(reg) | x8616_enc_modrm_rm(rm))
#define x8616_enc_modrm_seg(mod,sr,rm) C_(U1, x8616_enc_modrm_mod(mod) | x8616_enc_modrm_sr(sr) | x8616_enc_modrm_rm(rm))
@@ -720,12 +659,6 @@ FI_ U1 x8616_modrm_sr (U1 modrm) { return (
#define x8616_enc_alu_op(alu) x8616_enc_alu_ttt(alu)
#define x8616_enc_alu_rm_r(ttt,d,w) C_(U1, x8616_enc_alu_class() | x8616_enc_alu_ttt(ttt) | (X8616_OPCODE_ALU_RM_FORM << X8616_OPCODE_ALU_BIT2_SHIFT) | x8616_enc_d(d) | x8616_enc_width(w))
#define x8616_enc_alu_acc_i(ttt,w) C_(U1, x8616_enc_alu_class() | x8616_enc_alu_ttt(ttt) | (X8616_OPCODE_ALU_ACC_FORM << X8616_OPCODE_ALU_ACC_FORM_SHIFT) | x8616_enc_width(w))
#define x8616_enc_io_class() (X8616_OPCODE_IO_CLASS << X8616_OPCODE_IO_CLASS_STEM_SHIFT)
#define x8616_enc_io_dx(dx) ((dx) << X8616_OPCODE_IO_DX_STEM_SHIFT)
#define x8616_enc_io_out(out) ((out) << X8616_OPCODE_IO_OUT_STEM_SHIFT)
#define x8616_enc_io_stem(dx, out) (x8616_enc_io_class() | x8616_enc_io_dx(dx) | X8616_OPCODE_IO_FIXED_FORM | x8616_enc_io_out(out))
#define x8616_enc_io(dx, out, w) C_(U1, (x8616_enc_io_stem(dx, out) << X8616_OPCODE_W_HOLE) | x8616_enc_width(w))
#define x8616_enc_pair(bit) ((bit) << X8616_OPCODE_PAIR_SHIFT)
// Scalar / generic packets
@@ -736,16 +669,16 @@ FI_ U1 x8616_modrm_sr (U1 modrm) { return (
#define x8616_emit_op_i16(opcode,imm) u1_(opcode), x8616_emit_u2(imm)
#define x8616_emit_op_far(opcode,seg,off) u1_(opcode), x8616_emit_u2(off), x8616_emit_u2(seg)
#define x8616_emit_modrm(opcode,mod,reg,rm) u1_(opcode), x8616_enc_modrm(mod,reg,rm)
#define x8616_emit_modrm_d8(opcode,reg,rm,disp) x8616_emit_modrm (opcode,x8616_mod_mem_d8,reg,rm), u1_(disp)
#define x8616_emit_modrm_d16(opcode,reg,rm,disp) x8616_emit_modrm (opcode,x8616_mod_mem_d16,reg,rm), x8616_emit_s2(disp)
#define x8616_emit_modrm_direct(opcode,reg,addr) x8616_emit_modrm (opcode,x8616_mod_mem,reg,x8616_ea_direct), x8616_emit_u2(addr)
#define x8616_emit_modrm_i8(opcode,mod,reg,rm,imm) x8616_emit_modrm (opcode,mod,reg,rm), u1_(imm)
#define x8616_emit_modrm_i16(opcode,mod,reg,rm,imm) x8616_emit_modrm (opcode,mod,reg,rm), x8616_emit_u2(imm)
#define x8616_emit_modrm_d8_i8(opcode,reg,rm,disp,imm) x8616_emit_modrm_d8 (opcode,reg,rm,disp), u1_(imm)
#define x8616_emit_modrm_d8_i16(opcode,reg,rm,disp,imm) x8616_emit_modrm_d8 (opcode,reg,rm,disp), x8616_emit_u2(imm)
#define x8616_emit_modrm_d16_i8(opcode,reg,rm,disp,imm) x8616_emit_modrm_d16(opcode,reg,rm,disp), u1_(imm)
#define x8616_emit_modrm_d16_i16(opcode,reg,rm,disp,imm) x8616_emit_modrm_d16(opcode,reg,rm,disp), x8616_emit_u2(imm)
#define x8616_emit_modrm(header,mod,reg,rm) u1_(header), x8616_enc_modrm(mod,reg,rm)
#define x8616_emit_modrm_d8(header,reg,rm,disp) x8616_emit_modrm (header,x8616_mod_mem_d8,reg,rm), u1_(disp)
#define x8616_emit_modrm_d16(header,reg,rm,disp) x8616_emit_modrm (header,x8616_mod_mem_d16,reg,rm), x8616_emit_s2(disp)
#define x8616_emit_modrm_direct(header,reg,addr) x8616_emit_modrm (header,x8616_mod_mem,reg,x8616_ea_direct), x8616_emit_u2(addr)
#define x8616_emit_modrm_i8(header,mod,reg,rm,imm) x8616_emit_modrm (header,mod,reg,rm), u1_(imm)
#define x8616_emit_modrm_i16(header,mod,reg,rm,imm) x8616_emit_modrm (header,mod,reg,rm), x8616_emit_u2(imm)
#define x8616_emit_modrm_d8_i8(header,reg,rm,disp,imm) x8616_emit_modrm_d8 (header,reg,rm,disp), u1_(imm)
#define x8616_emit_modrm_d8_i16(header,reg,rm,disp,imm) x8616_emit_modrm_d8 (header,reg,rm,disp), x8616_emit_u2(imm)
#define x8616_emit_modrm_d16_i8(header,reg,rm,disp,imm) x8616_emit_modrm_d16(header,reg,rm,disp), u1_(imm)
#define x8616_emit_modrm_d16_i16(header,reg,rm,disp,imm) x8616_emit_modrm_d16(header,reg,rm,disp), x8616_emit_u2(imm)
// r/m + register / immediate packets