src/runtime/vdso_elf.go

// Copyright 2012 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.
//
// +build fuchsia linux
// +build 386 amd64 arm arm64 ppc64 ppc64le

package runtime

import "unsafe"

const (
	_AT_SYSINFO_EHDR = 33

	_PT_LOAD    = 1 /* Loadable program segment */
	_PT_DYNAMIC = 2 /* Dynamic linking information */

	_PF_X = 1 /* Executable PH segment */

	_DT_NULL     = 0          /* Marks end of dynamic section */
	_DT_HASH     = 4          /* Dynamic symbol hash table */
	_DT_STRTAB   = 5          /* Address of string table */
	_DT_SYMTAB   = 6          /* Address of symbol table */
	_DT_GNU_HASH = 0x6ffffef5 /* GNU-style dynamic symbol hash table */
	_DT_VERSYM   = 0x6ffffff0
	_DT_VERDEF   = 0x6ffffffc

	_VER_FLG_BASE = 0x1 /* Version definition of file itself */

	_SHN_UNDEF = 0 /* Undefined section */

	_SHT_DYNSYM = 11 /* Dynamic linker symbol table */

	_STT_FUNC = 2 /* Symbol is a code object */

	_STT_NOTYPE = 0 /* Symbol type is not specified */

	_STB_GLOBAL = 1 /* Global symbol */
	_STB_WEAK   = 2 /* Weak symbol */

	_EI_NIDENT = 16

	// Maximum indices for the array types used when traversing the vDSO ELF structures.
	// Computed from architecture-specific max provided by vdso_linux_*.go
	vdsoSymTabSize     = vdsoArrayMax / unsafe.Sizeof(elfSym{})
	vdsoDynSize        = vdsoArrayMax / unsafe.Sizeof(elfDyn{})
	vdsoSymStringsSize = vdsoArrayMax     // byte
	vdsoVerSymSize     = vdsoArrayMax / 2 // uint16
	vdsoHashSize       = vdsoArrayMax / 4 // uint32

	// vdsoBloomSizeScale is a scaling factor for gnuhash tables which are uint32 indexed,
	// but contain uintptrs
	vdsoBloomSizeScale = unsafe.Sizeof(uintptr(0)) / 4 // uint32
)

/* How to extract and insert information held in the st_info field.  */
func _ELF_ST_BIND(val byte) byte { return val >> 4 }
func _ELF_ST_TYPE(val byte) byte { return val & 0xf }