1 // Copyright 2012 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package runtime 6 7 // ELF32 structure definitions for use by the Linux vDSO loader 8 9 type elfSym struct { 10 st_name uint32 11 st_value uint32 12 st_size uint32 13 st_info byte 14 st_other byte 15 st_shndx uint16 16 } 17 18 type elfVerdef struct { 19 vd_version uint16 /* Version revision */ 20 vd_flags uint16 /* Version information */ 21 vd_ndx uint16 /* Version Index */ 22 vd_cnt uint16 /* Number of associated aux entries */ 23 vd_hash uint32 /* Version name hash value */ 24 vd_aux uint32 /* Offset in bytes to verdaux array */ 25 vd_next uint32 /* Offset in bytes to next verdef entry */ 26 } 27 28 type elfEhdr struct { 29 e_ident [_EI_NIDENT]byte /* Magic number and other info */ 30 e_type uint16 /* Object file type */ 31 e_machine uint16 /* Architecture */ 32 e_version uint32 /* Object file version */ 33 e_entry uint32 /* Entry point virtual address */ 34 e_phoff uint32 /* Program header table file offset */ 35 e_shoff uint32 /* Section header table file offset */ 36 e_flags uint32 /* Processor-specific flags */ 37 e_ehsize uint16 /* ELF header size in bytes */ 38 e_phentsize uint16 /* Program header table entry size */ 39 e_phnum uint16 /* Program header table entry count */ 40 e_shentsize uint16 /* Section header table entry size */ 41 e_shnum uint16 /* Section header table entry count */ 42 e_shstrndx uint16 /* Section header string table index */ 43 } 44 45 type elfPhdr struct { 46 p_type uint32 /* Segment type */ 47 p_offset uint32 /* Segment file offset */ 48 p_vaddr uint32 /* Segment virtual address */ 49 p_paddr uint32 /* Segment physical address */ 50 p_filesz uint32 /* Segment size in file */ 51 p_memsz uint32 /* Segment size in memory */ 52 p_flags uint32 /* Segment flags */ 53 p_align uint32 /* Segment alignment */ 54 } 55 56 type elfShdr struct { 57 sh_name uint32 /* Section name (string tbl index) */ 58 sh_type uint32 /* Section type */ 59 sh_flags uint32 /* Section flags */ 60 sh_addr uint32 /* Section virtual addr at execution */ 61 sh_offset uint32 /* Section file offset */ 62 sh_size uint32 /* Section size in bytes */ 63 sh_link uint32 /* Link to another section */ 64 sh_info uint32 /* Additional section information */ 65 sh_addralign uint32 /* Section alignment */ 66 sh_entsize uint32 /* Entry size if section holds table */ 67 } 68 69 type elfDyn struct { 70 d_tag int32 /* Dynamic entry type */ 71 d_val uint32 /* Integer value */ 72 } 73 74 type elfVerdaux struct { 75 vda_name uint32 /* Version or dependency names */ 76 vda_next uint32 /* Offset in bytes to next verdaux entry */ 77 } 78 79 const ( 80 // vdsoArrayMax is the byte-size of a maximally sized array on this architecture. 81 // See cmd/compile/internal/x86/galign.go arch.MAXWIDTH initialization, but must also 82 // be constrained to max +ve int. 83 vdsoArrayMax = 1<<31 - 1 84 ) 85 86 var sym_keys = []symbol_key{ 87 {"__vdso_clock_gettime", 0xd35ec75, 0x6e43a318, &__vdso_clock_gettime_sym}, 88 } 89 90 // initialize to fall back to syscall 91 var ( 92 __vdso_clock_gettime_sym uintptr = 0 93 ) 94
