diff options
Diffstat (limited to 'src/runtime/internal/sys/arch.go')
-rw-r--r-- | src/runtime/internal/sys/arch.go | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/runtime/internal/sys/arch.go b/src/runtime/internal/sys/arch.go index 13c00cf639..3c99a2f7da 100644 --- a/src/runtime/internal/sys/arch.go +++ b/src/runtime/internal/sys/arch.go @@ -18,3 +18,37 @@ const ( 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) + +// AIX requires a larger stack for syscalls. +const StackGuardMultiplier = StackGuardMultiplierDefault*(1-GoosAix) + 2*GoosAix + +// ArchFamily is the architecture family (AMD64, ARM, ...) +const ArchFamily ArchFamilyType = _ArchFamily + +// BigEndian reports whether the architecture is big-endian. +const BigEndian = GoarchArmbe|GoarchArm64be|GoarchMips|GoarchMips64|GoarchPpc|GoarchPpc64|GoarchS390|GoarchS390x|GoarchSparc|GoarchSparc64 == 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 |