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[llvm-readobj] Add GNU style dumper for .gnu.version section
Summary: Currently, `llvm-readobj` do not support GNU style dumper for symbol versioning sections. In this patch, I would like to implement dumper for `.gnu.version` section Reviewers: jhenderson, rupprecht, grimar Reviewed By: jhenderson, rupprecht Subscribers: llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59877 llvm-svn: 357578
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Xing GUO
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42
test/tools/llvm-readobj/elf-hidden-versym.test
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42
test/tools/llvm-readobj/elf-hidden-versym.test
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@ -0,0 +1,42 @@
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# RUN: yaml2obj %s -o %t
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# RUN: llvm-readelf -V %t | FileCheck %s --check-prefix=HIDDEN
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# HIDDEN: Version symbols section '.gnu.version' contains 2 entries:
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# HIDDEN-NEXT: Addr: 0000000000200210 Offset: 0x000240 Link: 6 (.dynsym)
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# HIDDEN-NEXT: 000: 0 (*local*) 3h(hiddensym)
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Entry: 0x0000000000201000
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Sections:
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- Name: .gnu.version
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Type: SHT_GNU_versym
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Flags: [ SHF_ALLOC ]
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Address: 0x0000000000200210
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Link: .dynsym
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AddressAlign: 0x0000000000000002
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EntSize: 0x0000000000000002
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Entries: [ 0, 0x8003 ]
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- Name: .gnu.version_r
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Type: SHT_GNU_verneed
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Flags: [ SHF_ALLOC ]
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Address: 0x0000000000200250
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Link: .dynstr
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AddressAlign: 0x0000000000000004
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Info: 0x0000000000000001
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Dependencies:
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- Version: 1
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File: somefile
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Entries:
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- Name: hiddensym
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Hash: 1234
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Flags: 0
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Other: 3
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DynamicSymbols:
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Global:
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- Name: h
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...
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42
test/tools/llvm-readobj/elf-invalid-versioning.test
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42
test/tools/llvm-readobj/elf-invalid-versioning.test
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@ -0,0 +1,42 @@
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# RUN: yaml2obj %s -o %t
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# RUN: llvm-readelf -V %t | FileCheck %s --check-prefix=INVALID
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# INVALID: Version symbols section '.gnu.version' contains 2 entries:
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# INVALID-NEXT: Addr: 0000000000200210 Offset: 0x000240 Link: 6 (.dynsym)
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# INVALID-NEXT: 000: 0 (*local*) 3 (*invalid*)
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Entry: 0x0000000000201000
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Sections:
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- Name: .gnu.version
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Type: SHT_GNU_versym
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Flags: [ SHF_ALLOC ]
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Address: 0x0000000000200210
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Link: .dynsym
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AddressAlign: 0x0000000000000002
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EntSize: 0x0000000000000002
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Entries: [ 0, 3 ]
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- Name: .gnu.version_r
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Type: SHT_GNU_verneed
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Flags: [ SHF_ALLOC ]
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Address: 0x0000000000200250
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Link: .dynstr
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AddressAlign: 0x0000000000000004
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Info: 0x0000000000000001
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Dependencies:
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- Version: 1
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File: somefile
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Entries:
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- Name: '' # invalid name
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Hash: 1937
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Flags: 233
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Other: 3
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DynamicSymbols:
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Global:
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- Name: f
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...
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@ -77,7 +77,11 @@ GNU-VERDEF: 0x000000006ffffff0 VERSYM 0x24c
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GNU-VERDEF: 0x000000006ffffffc VERDEF 0x25c
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GNU-VERDEF: 0x000000006ffffffd VERDEFNUM 3
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GNU-VERDEF: Dumper for .gnu.version is not implemented
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GNU-VERDEF: Version symbols section '.gnu.version' contains 8 entries:
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GNU-VERDEF-NEXT: Addr: 000000000000024c Offset: 0x00024c Link: 1 (.dynsym)
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GNU-VERDEF-NEXT: 000: 0 (*local*) 1 (*global*) 1 (*global*) 3 (VERSION2)
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GNU-VERDEF-NEXT: 004: 1 (*global*) 2 (VERSION1) 2 (VERSION1) 3 (VERSION2)
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GNU-VERDEF: Dumper for .gnu.version_d is not implemented
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RUN: llvm-readobj -V %p/Inputs/verneed.elf-x86-64 | FileCheck %s --check-prefix=LLVM-VERNEED
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@ -114,6 +118,9 @@ LLVM-VERNEED-NEXT: }
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LLVM-VERNEED-NEXT: }
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LLVM-VERNEED-NEXT: }
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GNU-VERNEED: Dumper for .gnu.version is not implemented
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GNU-VERNEED: Version symbols section '.gnu.version' contains 4 entries:
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GNU-VERNEED-NEXT: Addr: 0000000000010228 Offset: 0x000228 Link: 1 (.dynsym)
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GNU-VERNEED-NEXT: 000: 0 (*local*) 2 (v3) 3 (v2) 4 (v1)
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GNU-VERNEED: Dumper for .gnu.version_r is not implemented
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@ -3355,7 +3355,57 @@ void GNUStyle<ELFT>::printVersionSymbolSection(const ELFFile<ELFT> *Obj,
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return;
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StringRef SecName = unwrapOrError(Obj->getSectionName(Sec));
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OS << "Dumper for " << SecName << " is not implemented\n";
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uint64_t Entries = Sec->sh_size / sizeof(Elf_Versym);
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OS << "Version symbols section '" << SecName << "' "
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<< "contains " << Entries << " entries:\n";
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const Elf_Shdr *SymTab = unwrapOrError(Obj->getSection(Sec->sh_link));
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StringRef SymTabName = unwrapOrError(Obj->getSectionName(SymTab));
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OS << " Addr: " << format_hex_no_prefix(Sec->sh_addr, 16)
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<< " Offset: " << format_hex(Sec->sh_offset, 8)
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<< " Link: " << Sec->sh_link << " (" << SymTabName << ")\n";
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const uint8_t *VersymBuf =
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reinterpret_cast<const uint8_t *>(Obj->base() + Sec->sh_offset);
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const ELFDumper<ELFT> *Dumper = this->dumper();
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StringRef StrTable = Dumper->getDynamicStringTable();
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// readelf prints 4 entries per line.
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for (uint64_t VersymRow = 0; VersymRow < Entries; VersymRow += 4) {
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OS << " " << format_hex_no_prefix(VersymRow, 3) << ":";
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for (uint64_t VersymIndex = 0;
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(VersymIndex < 4) && (VersymIndex + VersymRow) < Entries;
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++VersymIndex) {
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const Elf_Versym *Versym =
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reinterpret_cast<const Elf_Versym *>(VersymBuf);
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switch (Versym->vs_index) {
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case 0:
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OS << " 0 (*local*) ";
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break;
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case 1:
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OS << " 1 (*global*) ";
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break;
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default:
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OS << format("%4x%c", Versym->vs_index & VERSYM_VERSION,
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Versym->vs_index & VERSYM_HIDDEN ? 'h' : ' ');
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bool IsDefault = true;
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std::string VersionName = Dumper->getSymbolVersionByIndex(
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StrTable, Versym->vs_index, IsDefault);
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if (!VersionName.empty())
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VersionName = "(" + VersionName + ")";
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else
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VersionName = "(*invalid*)";
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OS << left_justify(VersionName, 13);
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}
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VersymBuf += sizeof(Elf_Versym);
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}
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OS << '\n';
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}
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OS << '\n';
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}
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template <class ELFT>
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