arch.go

Documentation: runtime/internal/sys

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package sys
     6  
     7  type ArchFamilyType int
     8  
     9  const (
    10  	AMD64 ArchFamilyType = iota
    11  	ARM
    12  	ARM64
    13  	I386
    14  	MIPS
    15  	MIPS64
    16  	PPC64
    17  	RISCV64
    18  	S390X
    19  	WASM
    20  )
    21  
    22  // PtrSize is the size of a pointer in bytes - unsafe.Sizeof(uintptr(0)) but as an ideal constant.
    23  // It is also the size of the machine's native word size (that is, 4 on 32-bit systems, 8 on 64-bit).
    24  const PtrSize = 4 << (^uintptr(0) >> 63)
    25  
    26  // AIX requires a larger stack for syscalls.
    27  const StackGuardMultiplier = StackGuardMultiplierDefault*(1-GoosAix) + 2*GoosAix
    28  
    29  // ArchFamily is the architecture family (AMD64, ARM, ...)
    30  const ArchFamily ArchFamilyType = _ArchFamily
    31  
    32  // BigEndian reports whether the architecture is big-endian.
    33  const BigEndian = GoarchArmbe|GoarchArm64be|GoarchMips|GoarchMips64|GoarchPpc|GoarchPpc64|GoarchS390|GoarchS390x|GoarchSparc|GoarchSparc64 == 1
    34  
    35  // DefaultPhysPageSize is the default physical page size.
    36  const DefaultPhysPageSize = _DefaultPhysPageSize
    37  
    38  // PCQuantum is the minimal unit for a program counter (1 on x86, 4 on most other systems).
    39  // The various PC tables record PC deltas pre-divided by PCQuantum.
    40  const PCQuantum = _PCQuantum
    41  
    42  // Int64Align is the required alignment for a 64-bit integer (4 on 32-bit systems, 8 on 64-bit).
    43  const Int64Align = PtrSize
    44  
    45  // MinFrameSize is the size of the system-reserved words at the bottom
    46  // of a frame (just above the architectural stack pointer).
    47  // It is zero on x86 and PtrSize on most non-x86 (LR-based) systems.
    48  // On PowerPC it is larger, to cover three more reserved words:
    49  // the compiler word, the link editor word, and the TOC save word.
    50  const MinFrameSize = _MinFrameSize
    51  
    52  // StackAlign is the required alignment of the SP register.
    53  // The stack must be at least word aligned, but some architectures require more.
    54  const StackAlign = _StackAlign
    55
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