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// Copyright 2014 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 sys import ( "internal/goarch" "internal/goos" ) // AIX requires a larger stack for syscalls. // The race build also needs more stack. See issue 54291. // This arithmetic must match that in cmd/internal/objabi/stack.go:stackGuardMultiplier. const StackGuardMultiplier = 1 + goos.IsAix + isRace // DefaultPhysPageSize is the default physical page size. const DefaultPhysPageSize = goarch.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 = goarch.PCQuantum // Int64Align is the required alignment for a 64-bit integer (4 on 32-bit systems, 8 on 64-bit). const Int64Align = goarch.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 = goarch.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 = goarch.StackAlign