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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357578
91177308-0d34-0410-b5e6-
96231b3b80d8
--- /dev/null
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-readelf -V %t | FileCheck %s --check-prefix=HIDDEN
+
+# HIDDEN: Version symbols section '.gnu.version' contains 2 entries:
+# HIDDEN-NEXT: Addr: 0000000000200210 Offset: 0x000240 Link: 6 (.dynsym)
+# HIDDEN-NEXT: 000: 0 (*local*) 3h(hiddensym)
+
+--- !ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_EXEC
+ Machine: EM_X86_64
+ Entry: 0x0000000000201000
+Sections:
+ - Name: .gnu.version
+ Type: SHT_GNU_versym
+ Flags: [ SHF_ALLOC ]
+ Address: 0x0000000000200210
+ Link: .dynsym
+ AddressAlign: 0x0000000000000002
+ EntSize: 0x0000000000000002
+ Entries: [ 0, 0x8003 ]
+ - Name: .gnu.version_r
+ Type: SHT_GNU_verneed
+ Flags: [ SHF_ALLOC ]
+ Address: 0x0000000000200250
+ Link: .dynstr
+ AddressAlign: 0x0000000000000004
+ Info: 0x0000000000000001
+ Dependencies:
+ - Version: 1
+ File: somefile
+ Entries:
+ - Name: hiddensym
+ Hash: 1234
+ Flags: 0
+ Other: 3
+DynamicSymbols:
+ Global:
+ - Name: h
+...
--- /dev/null
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-readelf -V %t | FileCheck %s --check-prefix=INVALID
+
+# INVALID: Version symbols section '.gnu.version' contains 2 entries:
+# INVALID-NEXT: Addr: 0000000000200210 Offset: 0x000240 Link: 6 (.dynsym)
+# INVALID-NEXT: 000: 0 (*local*) 3 (*invalid*)
+
+--- !ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_EXEC
+ Machine: EM_X86_64
+ Entry: 0x0000000000201000
+Sections:
+ - Name: .gnu.version
+ Type: SHT_GNU_versym
+ Flags: [ SHF_ALLOC ]
+ Address: 0x0000000000200210
+ Link: .dynsym
+ AddressAlign: 0x0000000000000002
+ EntSize: 0x0000000000000002
+ Entries: [ 0, 3 ]
+ - Name: .gnu.version_r
+ Type: SHT_GNU_verneed
+ Flags: [ SHF_ALLOC ]
+ Address: 0x0000000000200250
+ Link: .dynstr
+ AddressAlign: 0x0000000000000004
+ Info: 0x0000000000000001
+ Dependencies:
+ - Version: 1
+ File: somefile
+ Entries:
+ - Name: '' # invalid name
+ Hash: 1937
+ Flags: 233
+ Other: 3
+DynamicSymbols:
+ Global:
+ - Name: f
+...
GNU-VERDEF: 0x000000006ffffffc VERDEF 0x25c
GNU-VERDEF: 0x000000006ffffffd VERDEFNUM 3
-GNU-VERDEF: Dumper for .gnu.version is not implemented
+GNU-VERDEF: Version symbols section '.gnu.version' contains 8 entries:
+GNU-VERDEF-NEXT: Addr: 000000000000024c Offset: 0x00024c Link: 1 (.dynsym)
+GNU-VERDEF-NEXT: 000: 0 (*local*) 1 (*global*) 1 (*global*) 3 (VERSION2)
+GNU-VERDEF-NEXT: 004: 1 (*global*) 2 (VERSION1) 2 (VERSION1) 3 (VERSION2)
+
GNU-VERDEF: Dumper for .gnu.version_d is not implemented
RUN: llvm-readobj -V %p/Inputs/verneed.elf-x86-64 | FileCheck %s --check-prefix=LLVM-VERNEED
LLVM-VERNEED-NEXT: }
LLVM-VERNEED-NEXT: }
-GNU-VERNEED: Dumper for .gnu.version is not implemented
+GNU-VERNEED: Version symbols section '.gnu.version' contains 4 entries:
+GNU-VERNEED-NEXT: Addr: 0000000000010228 Offset: 0x000228 Link: 1 (.dynsym)
+GNU-VERNEED-NEXT: 000: 0 (*local*) 2 (v3) 3 (v2) 4 (v1)
+
GNU-VERNEED: Dumper for .gnu.version_r is not implemented
return;
StringRef SecName = unwrapOrError(Obj->getSectionName(Sec));
- OS << "Dumper for " << SecName << " is not implemented\n";
+ uint64_t Entries = Sec->sh_size / sizeof(Elf_Versym);
+
+ OS << "Version symbols section '" << SecName << "' "
+ << "contains " << Entries << " entries:\n";
+
+ const Elf_Shdr *SymTab = unwrapOrError(Obj->getSection(Sec->sh_link));
+ StringRef SymTabName = unwrapOrError(Obj->getSectionName(SymTab));
+ OS << " Addr: " << format_hex_no_prefix(Sec->sh_addr, 16)
+ << " Offset: " << format_hex(Sec->sh_offset, 8)
+ << " Link: " << Sec->sh_link << " (" << SymTabName << ")\n";
+
+ const uint8_t *VersymBuf =
+ reinterpret_cast<const uint8_t *>(Obj->base() + Sec->sh_offset);
+ const ELFDumper<ELFT> *Dumper = this->dumper();
+ StringRef StrTable = Dumper->getDynamicStringTable();
+
+ // readelf prints 4 entries per line.
+ for (uint64_t VersymRow = 0; VersymRow < Entries; VersymRow += 4) {
+ OS << " " << format_hex_no_prefix(VersymRow, 3) << ":";
+
+ for (uint64_t VersymIndex = 0;
+ (VersymIndex < 4) && (VersymIndex + VersymRow) < Entries;
+ ++VersymIndex) {
+ const Elf_Versym *Versym =
+ reinterpret_cast<const Elf_Versym *>(VersymBuf);
+ switch (Versym->vs_index) {
+ case 0:
+ OS << " 0 (*local*) ";
+ break;
+ case 1:
+ OS << " 1 (*global*) ";
+ break;
+ default:
+ OS << format("%4x%c", Versym->vs_index & VERSYM_VERSION,
+ Versym->vs_index & VERSYM_HIDDEN ? 'h' : ' ');
+
+ bool IsDefault = true;
+ std::string VersionName = Dumper->getSymbolVersionByIndex(
+ StrTable, Versym->vs_index, IsDefault);
+
+ if (!VersionName.empty())
+ VersionName = "(" + VersionName + ")";
+ else
+ VersionName = "(*invalid*)";
+ OS << left_justify(VersionName, 13);
+ }
+ VersymBuf += sizeof(Elf_Versym);
+ }
+ OS << '\n';
+ }
+ OS << '\n';
}
template <class ELFT>