petrbalvin
f83bc8ddef
The no-operand flag and system controls, the sign-extension pair, the string primitives, the multi-byte no-ops, the cache controls, MOVBE, the compare-exchange doubles, the random source and FS/GS base pairs, the descriptor-table accesses, the 0F 00/01 register controls and the LAR/LSL selector reads and far-segment loads, each pinned byte for byte against go tool asm through every corpus line the toolchain's own amd64enc.s carries for the families (279 lines). Assisted-by: GLM 5.3 Flash
88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: BSD-3-Clause
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package asm
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// encodeAmd64Family routes a mnemonic through the amd64 corpus families the
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// dedicated amd64_*.go files implement. The first family that owns the name
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// decides the outcome: its bytes, or its error. A name no family claims
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// falls through to the scalar dispatch in (*enc).encode untouched.
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func (e *enc) encodeAmd64Family(upper string, ops []Operand) (bool, error) {
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if ok, err := e.encodeX87(upper, ops); ok {
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return true, err
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}
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if ok, err := e.encodeSystem(upper, ops); ok {
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return true, err
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}
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return false, nil
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}
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// amd64FamilyEncodable mirrors encodeAmd64Family for the lint-time
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// predicate: true when some family owns the mnemonic, whatever the operand
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// shapes. It must claim exactly the names encodeAmd64Family does.
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func amd64FamilyEncodable(upper string) bool {
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if _, ok := x87NoOperand[upper]; ok {
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return true
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}
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if _, ok := x87Arith[upper]; ok {
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return true
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}
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if _, ok := x87FCmov[upper]; ok {
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return true
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}
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if _, ok := x87Compare[upper]; ok {
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return true
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}
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if _, ok := x87MemUnary[upper]; ok {
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return true
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}
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if _, ok := x87Fxsav[upper]; ok {
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return true
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}
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if upper == "FADDDP" {
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return true
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}
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if _, ok := systemNoOperand[upper]; ok {
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return true
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}
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if b, size := splitSize(upper); size != 0 {
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switch upper[len(upper)-1] {
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case 'B', 'W', 'L', 'Q':
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if _, ok := stringOp[b]; ok {
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return true
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}
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}
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if m, ok := sysRm[b]; ok && m.sized {
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return true
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}
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}
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if _, ok := nopWidth[upper]; ok {
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return true
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}
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if _, ok := cacheControl[upper]; ok {
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return true
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}
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if _, ok := movbeSize[upper]; ok {
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return true
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}
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if _, ok := randSource[base(upper, 6)]; ok {
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return true
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}
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if _, ok := fsGsBase[base(upper, 8)]; ok {
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return true
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}
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if _, ok := descTable[upper]; ok {
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return true
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}
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if _, ok := sysRm[upper]; ok {
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return true
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}
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if _, ok := selectorRead[base(upper, 3)]; ok {
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return true
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}
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if _, ok := farSegLoad[base(upper, 3)]; ok {
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return true
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}
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return upper == "CMPXCHG8B" || upper == "CMPXCHG16B"
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}
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