| // 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 |
