1 //===- lib/MC/MCELF.cpp - MC ELF ------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements ELF object file writer information. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/MC/MCELF.h" 15 #include "llvm/MC/MCAssembler.h" 16 #include "llvm/MC/MCELFSymbolFlags.h" 17 #include "llvm/MC/MCFixupKindInfo.h" 18 #include "llvm/Support/ELF.h" 19 20 namespace llvm { 21 SetBinding(MCSymbolData & SD,unsigned Binding)22 void MCELF::SetBinding(MCSymbolData &SD, unsigned Binding) { 23 assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL || 24 Binding == ELF::STB_WEAK); 25 uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift); 26 SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift)); 27 } 28 GetBinding(const MCSymbolData & SD)29 unsigned MCELF::GetBinding(const MCSymbolData &SD) { 30 uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift; 31 assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL || 32 Binding == ELF::STB_WEAK); 33 return Binding; 34 } 35 SetType(MCSymbolData & SD,unsigned Type)36 void MCELF::SetType(MCSymbolData &SD, unsigned Type) { 37 assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT || 38 Type == ELF::STT_FUNC || Type == ELF::STT_SECTION || 39 Type == ELF::STT_FILE || Type == ELF::STT_COMMON || 40 Type == ELF::STT_TLS || Type == ELF::STT_GNU_IFUNC); 41 42 uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STT_Shift); 43 SD.setFlags(OtherFlags | (Type << ELF_STT_Shift)); 44 } 45 GetType(const MCSymbolData & SD)46 unsigned MCELF::GetType(const MCSymbolData &SD) { 47 uint32_t Type = (SD.getFlags() & (0xf << ELF_STT_Shift)) >> ELF_STT_Shift; 48 assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT || 49 Type == ELF::STT_FUNC || Type == ELF::STT_SECTION || 50 Type == ELF::STT_FILE || Type == ELF::STT_COMMON || 51 Type == ELF::STT_TLS || Type == ELF::STT_GNU_IFUNC); 52 return Type; 53 } 54 55 // Visibility is stored in the first two bits of st_other 56 // st_other values are stored in the second byte of get/setFlags SetVisibility(MCSymbolData & SD,unsigned Visibility)57 void MCELF::SetVisibility(MCSymbolData &SD, unsigned Visibility) { 58 assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL || 59 Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED); 60 61 uint32_t OtherFlags = SD.getFlags() & ~(0x3 << ELF_STV_Shift); 62 SD.setFlags(OtherFlags | (Visibility << ELF_STV_Shift)); 63 } 64 GetVisibility(MCSymbolData & SD)65 unsigned MCELF::GetVisibility(MCSymbolData &SD) { 66 unsigned Visibility = 67 (SD.getFlags() & (0x3 << ELF_STV_Shift)) >> ELF_STV_Shift; 68 assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL || 69 Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED); 70 return Visibility; 71 } 72 73 // Other is stored in the last six bits of st_other 74 // st_other values are stored in the second byte of get/setFlags setOther(MCSymbolData & SD,unsigned Other)75 void MCELF::setOther(MCSymbolData &SD, unsigned Other) { 76 uint32_t OtherFlags = SD.getFlags() & ~(0x3f << ELF_Other_Shift); 77 SD.setFlags(OtherFlags | (Other << ELF_Other_Shift)); 78 } 79 getOther(MCSymbolData & SD)80 unsigned MCELF::getOther(MCSymbolData &SD) { 81 unsigned Other = 82 (SD.getFlags() & (0x3f << ELF_Other_Shift)) >> ELF_Other_Shift; 83 return Other; 84 } 85 86 } 87