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yet more progress

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ed
2026-09-09 14:38:56 -04:00
parent 95e67a8c1a
commit b973b0cd41
8 changed files with 314 additions and 423 deletions
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code/8086/encoder.h
+71 -1
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@@ -16,6 +16,7 @@ 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))
@@ -148,6 +149,21 @@ typedef Enum_(U1, X8616_EncodingFlags) {
x8616_encoding_prefix = 0b00000010,
};
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,
};
/* mod_rm (Optional): Fixed constraint on the ModR/M byte.
post_opcode (Optional): Fixed byte immediately following the opcode.
fields: Variable fields carried by the opcode byte. width == 0: field is absent.
@@ -163,6 +179,8 @@ typedef Struct_(X8616_Encoding) {
X8616_Operand operands[2];
X8616_WidthMode width;
X8616_EncodingFlags flags;
X8616_DigitKind digit_kind;
X8616_PairKind pair_kind;
X8616_Op op;
};
@@ -297,6 +315,49 @@ typedef Enum_(U1, X8616_Shift) {
x8616_sar = 0b111,
};
RO_ global X8616_Op x8616_op_from_shift[] = {
[x8616_rol] = x8616_op_rol,
[x8616_ror] = x8616_op_ror,
[x8616_rcl] = x8616_op_rcl,
[x8616_rcr] = x8616_op_rcr,
[x8616_shl] = x8616_op_shl,
[x8616_shr] = x8616_op_shr,
[0b110] = x8616_op_invalid,
[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,
};
RO_ global X8616_Op x8616_op_from_pushpop[] = {
[0] = x8616_op_push,
[1] = x8616_op_pop,
};
typedef Enum_(U1, X8616_Condition) {
x8616_cc_o = 0b0000,
x8616_cc_no = 0b0001,
@@ -431,7 +492,8 @@ typedef Enum_(U1, X8616_Opcode) {
};
enum {
X8616_OPCODE_MASK = x8616_field_mask(0, 8),
X8616_OPCODE_BIT_WIDTH = 1,
X8616_OPCODE_MASK = x8616_field_mask(0, 8),
X8616_POST_OPCODE_AAM_AAD = 0b00001010,
@@ -545,6 +607,11 @@ enum {
X8616_OPCODE_ALU_BIT2_SHIFT = 2,
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_IO_CLASS = 0b1110,
X8616_OPCODE_IO_CLASS_SHIFT = 4,
};
// ============================================================================
@@ -616,6 +683,9 @@ 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) | (0 << 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_stem(dx, out) ((X8616_OPCODE_IO_CLASS << 3) | ((dx) << 2) | 0b10 | (out))
#define x8616_enc_io(dx, out, w) C_(U1, (x8616_enc_io_stem(dx, out) << X8616_OPCODE_W_PREFIX_SHIFT) | x8616_enc_width(w))
#define x8616_enc_pair(bit) ((bit) << X8616_OPCODE_PAIR_SHIFT)
// Scalar / generic packets