| // 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 and OpenBSD require 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 + goos.IsOpenbsd + 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 | |