| // Copyright 2021 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| // package goarch contains GOARCH-specific constants. | |
| package goarch | |
| // The next line makes 'go generate' write the zgoarch*.go files with | |
| // per-arch information, including constants named $GOARCH for every | |
| // GOARCH. The constant is 1 on the current system, 0 otherwise; multiplying | |
| // by them is useful for defining GOARCH-specific constants. | |
| // | |
| //go:generate go run gengoarch.go | |
| // ArchFamilyType represents a family of one or more related architectures. | |
| // For example, ppc64 and ppc64le are both members of the PPC64 family. | |
| type ArchFamilyType int | |
| const ( | |
| AMD64 ArchFamilyType = iota | |
| ARM | |
| ARM64 | |
| I386 | |
| LOONG64 | |
| MIPS | |
| MIPS64 | |
| PPC64 | |
| RISCV64 | |
| S390X | |
| WASM | |
| ) | |
| // PtrSize is the size of a pointer in bytes - unsafe.Sizeof(uintptr(0)) but as an ideal constant. | |
| // It is also the size of the machine's native word size (that is, 4 on 32-bit systems, 8 on 64-bit). | |
| const PtrSize = 4 << (^uintptr(0) >> 63) | |
| // PtrBits is bit width of a pointer. | |
| const PtrBits = PtrSize * 8 | |
| // ArchFamily is the architecture family (AMD64, ARM, ...) | |
| const ArchFamily ArchFamilyType = _ArchFamily | |
| // BigEndian reports whether the architecture is big-endian. | |
| const BigEndian = IsArmbe|IsArm64be|IsMips|IsMips64|IsPpc|IsPpc64|IsS390|IsS390x|IsSparc|IsSparc64 == 1 | |
| // DefaultPhysPageSize is the default physical page size. | |
| const DefaultPhysPageSize = _DefaultPhysPageSize | |
| // PCQuantum is the minimal unit for a program counter (1 on x86, 4 on most other systems). | |
| // The various PC tables record PC deltas pre-divided by PCQuantum. | |
| const PCQuantum = _PCQuantum | |
| // Int64Align is the required alignment for a 64-bit integer (4 on 32-bit systems, 8 on 64-bit). | |
| const Int64Align = PtrSize | |
| // MinFrameSize is the size of the system-reserved words at the bottom | |
| // of a frame (just above the architectural stack pointer). | |
| // It is zero on x86 and PtrSize on most non-x86 (LR-based) systems. | |
| // On PowerPC it is larger, to cover three more reserved words: | |
| // the compiler word, the link editor word, and the TOC save word. | |
| const MinFrameSize = _MinFrameSize | |
| // StackAlign is the required alignment of the SP register. | |
| // The stack must be at least word aligned, but some architectures require more. | |
| const StackAlign = _StackAlign | |