ww/selfhost/cmd/w6a/opcodes.ww

// selfhost/cmd/w6a/opcodes.ww — types + constants shared across the
// w6a port. Mirrors cmd/w6a/a.h and cmd/w6c/6.out.h.

package w6a;

// ---- registers + operand kinds (from 6.out.h) -------------------------
// These must stay numerically aligned with the C enum so that ww-cgen
// output (which reads them via `D_AX(SB)` etc.) lands on the same
// integers when read by ww-w6a.
def D_NONE: i32 = 0;

def D_AX: i32 = 1;
def D_CX: i32 = 2;
def D_DX: i32 = 3;
def D_BX: i32 = 4;
def D_SP: i32 = 5;
def D_BP: i32 = 6;
def D_SI: i32 = 7;
def D_DI: i32 = 8;
def D_R8:  i32 = 9;
def D_R9:  i32 = 10;
def D_R10: i32 = 11;
def D_R11: i32 = 12;
def D_R12: i32 = 13;
def D_R13: i32 = 14;
def D_R14: i32 = 15;
def D_R15: i32 = 16;

def D_X0:  i32 = 17;
def D_X1:  i32 = 18;
def D_X2:  i32 = 19;
def D_X3:  i32 = 20;
def D_X4:  i32 = 21;
def D_X5:  i32 = 22;
def D_X6:  i32 = 23;
def D_X7:  i32 = 24;
def D_X8:  i32 = 25;
def D_X9:  i32 = 26;
def D_X10: i32 = 27;
def D_X11: i32 = 28;
def D_X12: i32 = 29;
def D_X13: i32 = 30;
def D_X14: i32 = 31;
def D_X15: i32 = 32;

def D_PSP: i32 = 33;
def D_PFP: i32 = 34;
def D_PSB: i32 = 35;

def D_CONST:  i32 = 36;
def D_BRANCH: i32 = 37;
def D_EXTERN: i32 = 38;
def D_INDIR:  i32 = 39;

// ---- opcodes ----------------------------------------------------------
def A_NOP: i32 = 0;
def A_TEXT: i32 = 1;
def A_DATA: i32 = 2;
def A_GLOBL: i32 = 3;
def A_END: i32 = 4;

def A_MOVQ: i32 = 5;
def A_MOVL: i32 = 6;
def A_MOVB: i32 = 7;
def A_MOVZBQ: i32 = 8;
def A_MOVSXD: i32 = 9;
def A_MOVW: i32 = 62;
def A_MOVZWQ: i32 = 63;
def A_MOVSWQ: i32 = 64;
def A_MOVSBQ: i32 = 65;

def A_MOVSD: i32 = 10;
def A_ADDSD: i32 = 11;
def A_SUBSD: i32 = 12;
def A_MULSD: i32 = 13;
def A_DIVSD: i32 = 14;
def A_UCOMISD: i32 = 15;
def A_CVTTSD2SI: i32 = 16;
def A_CVTSI2SD: i32 = 17;

def A_MOVSS: i32 = 18;
def A_ADDSS: i32 = 19;
def A_SUBSS: i32 = 20;
def A_MULSS: i32 = 21;
def A_DIVSS: i32 = 22;
def A_UCOMISS: i32 = 23;
def A_CVTTSS2SI: i32 = 24;
def A_CVTSI2SS: i32 = 25;
def A_CVTSD2SS: i32 = 26;
def A_CVTSS2SD: i32 = 27;

def A_ADDQ: i32 = 28;
def A_SUBQ: i32 = 29;
def A_IMULQ: i32 = 30;
def A_IDIVQ: i32 = 31;
def A_DIVQ: i32 = 32;
def A_NEGQ: i32 = 33;
def A_NOTQ: i32 = 34;
def A_ANDQ: i32 = 35;
def A_ORQ: i32 = 36;
def A_XORQ: i32 = 37;
def A_SHLQ: i32 = 38;
def A_SHRQ: i32 = 39;
def A_CMPQ: i32 = 40;

def A_PUSHQ: i32 = 41;
def A_POPQ: i32 = 42;
def A_LEAQ: i32 = 43;

def A_CALL: i32 = 44;
def A_RET:  i32 = 45;
def A_JMP:  i32 = 46;
def A_JE:   i32 = 47;
def A_JNE:  i32 = 48;
def A_JL:   i32 = 49;
def A_JLE:  i32 = 50;
def A_JG:   i32 = 51;
def A_JGE:  i32 = 52;
def A_JB:   i32 = 53;
def A_JBE:  i32 = 54;
def A_JA:   i32 = 55;
def A_JAE:  i32 = 56;
def A_JZ:   i32 = 57;
def A_JNZ:  i32 = 58;
// 67 (next free above A_CQO=66): appended so the existing A_MOV*/
// A_SYSCALL/A_DATAW/A_DATAR/A_CQO numbers stay put. Jump on
// parity (PF=1): UCOMISD unordered (#97).
def A_JP:   i32 = 67;
// #136: arithmetic right-shift, sign-extends MSB. SHR injects
// zeros and is wrong for signed operands; cgen routes signed
// `>>` / `>>=` through SAR after this opcode landed.
def A_SARQ: i32 = 68;

def A_SYSCALL: i32 = 59;

// Writable data + reloc-only data. Mirror cmd/w6c/6.out.h.
// A_DATAW: bytes land in .data (RW) instead of .text.
// A_DATAR: record an R_X86_64_64 reloc at a .data slot, patched
//          to a target symbol's runtime VA at link time.
def A_DATAW: i32 = 60;
def A_DATAR: i32 = 61;

// REX.W 99 — sign-extend RAX into RDX:RAX. Pairs with IDIVQ for
// signed division; pendant to the MOVQ $0, DX zero-fill that pairs
// with DIVQ.
def A_CQO: i32 = 66;

// ---- structs (mirror cmd/w6a/a.h) --------------------------------------

type aoperand = struct {
	atype:  i32,	// D_NONE / D_AX..D_R15 / D_CONST / D_INDIR / D_EXTERN / D_BRANCH
	reg:    i32,
	offset: i64,
	asym:   str,
};

// `from` and `to` are pointer-to-aoperand (rather than embedded).
// The C cgen doesn't support chained-dot through embedded value
// fields, so allocating each operand once per prog lets us write
// `p.to.atype` directly.
type aprog = struct {
	as_:   i32,
	from:  *aoperand,
	to:    *aoperand,
	line:  i32,
	label: str,
	link:  *aprog,
	bytes: *u8,	// payload for A_DATA
	nbytes: u64,
};

type asym = struct {
	name:      str,
	defined:   i32,
	istext:    i32,
	isdata:    i32,	// mutually exclusive with istext; DATAW symbols
	isglobal:  i32,
	addr:      u64,	// offset within its section (.text or .data)
	idx:       i32,
	snext:     *asym,
};

type areloc = struct {
	off:    u64,
	section: i32,	// 0 = .text, 1 = .data
	kind:   i32,
	asy:    *asym,
	addend: i64,
	rnext:  *areloc,
};

type afixup = struct {
	off:    u64,	// where the rel32 lands in .text
	label:  str,
	fnext:  *afixup,
};

type asm_ = struct {
	file:    str,
	src:     *u8,
	srclen:  u64,
	pos:     u64,
	line:    i32,

	head:    *aprog,
	tail:    *aprog,

	text:    *u8,
	textcap: u64,
	textlen: u64,

	// Writable .data. Empty unless any DATAW directive was seen;
	// obj.ww emits the extra section conditionally so .o output
	// stays byte-identical for inputs that don't use DATAW (test
	// 991 byte-diff invariant).
	data:    *u8,
	datacap: u64,
	datalen: u64,

	syms:    *asym,
	relocs:  *areloc,
	fixups:  *afixup,

	errs:    i32,
};