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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