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[llvm-readobj] Add some generic notes (e.g. NT_VERSION) 

Summary: Support reading notes that don't have a standard note name.

Reviewers: MaskRay

Reviewed By: MaskRay

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59969

llvm-svn: 357271
This commit is contained in:
Jordan Rupprecht 2019-03-29 16:48:19 +00:00
parent 342aaa14b1
commit 871baa2551
3 changed files with 122 additions and 3 deletions
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8
llvm/include/llvm/BinaryFormat/ELF.h
View File

@ -1339,6 +1339,14 @@ enum {
NT_FREEBSD_PROCSTAT_AUXV = 16,
};
// Generic note types
enum : unsigned {
NT_VERSION = 1,
NT_ARCH = 2,
NT_GNU_BUILD_ATTRIBUTE_OPEN = 0x100,
NT_GNU_BUILD_ATTRIBUTE_FUNC = 0x101,
};
enum {
NT_GNU_ABI_TAG = 1,
NT_GNU_HWCAP = 2,

85
llvm/test/tools/llvm-readobj/note-generic.s Normal file
View File

@ -0,0 +1,85 @@
// REQUIRES: x86-registered-target
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o %t.o
// RUN: llvm-readobj --notes %t.o | FileCheck %s --check-prefix=LLVM
// RUN: llvm-readelf --notes %t.o | FileCheck %s --check-prefix=GNU
// GNU: Displaying notes found at file offset 0x00000040 with length 0x00000010:
// GNU-NEXT: Owner Data size Description
// GNU-NEXT: XYZ 0x00000000 NT_VERSION (version)
// GNU: Displaying notes found at file offset 0x00000050 with length 0x00000010:
// GNU-NEXT: Owner Data size Description
// GNU-NEXT: XYZ 0x00000000 NT_ARCH (architecture)
// GNU: Displaying notes found at file offset 0x00000060 with length 0x00000010:
// GNU-NEXT: Owner Data size Description
// GNU-NEXT: XYZ 0x00000000 OPEN
// GNU: Displaying notes found at file offset 0x00000070 with length 0x00000010:
// GNU-NEXT: Owner Data size Description
// GNU-NEXT: XYZ 0x00000000 func
// LLVM: Notes [
// LLVM-NEXT: NoteSection {
// LLVM-NEXT: Offset: 0x40
// LLVM-NEXT: Size: 0x10
// LLVM-NEXT: Note {
// LLVM-NEXT: Owner: XYZ
// LLVM-NEXT: Data size: 0x0
// LLVM-NEXT: Type: NT_VERSION (version)
// LLVM-NEXT: }
// LLVM-NEXT: }
// LLVM-NEXT: NoteSection {
// LLVM-NEXT: Offset: 0x50
// LLVM-NEXT: Size: 0x10
// LLVM-NEXT: Note {
// LLVM-NEXT: Owner: XYZ
// LLVM-NEXT: Data size: 0x0
// LLVM-NEXT: Type: NT_ARCH (architecture)
// LLVM-NEXT: }
// LLVM-NEXT: }
// LLVM-NEXT: NoteSection {
// LLVM-NEXT: Offset: 0x60
// LLVM-NEXT: Size: 0x10
// LLVM-NEXT: Note {
// LLVM-NEXT: Owner: XYZ
// LLVM-NEXT: Data size: 0x0
// LLVM-NEXT: Type: OPEN
// LLVM-NEXT: }
// LLVM-NEXT: }
// LLVM-NEXT: NoteSection {
// LLVM-NEXT: Offset: 0x70
// LLVM-NEXT: Size: 0x10
// LLVM-NEXT: Note {
// LLVM-NEXT: Owner: XYZ
// LLVM-NEXT: Data size: 0x0
// LLVM-NEXT: Type: func
// LLVM-NEXT: }
// LLVM-NEXT: }
// LLVM-NEXT: ]
.section ".note.version", "a"
.align 4
.long 4 /* namesz */
.long 0 /* descsz */
.long 1 /* type = NT_VERSION */
.asciz "XYZ"
.section ".note.arch", "a"
.align 4
.long 4 /* namesz */
.long 0 /* descsz */
.long 2 /* type = NT_ARCH*/
.asciz "XYZ"
.section ".note.open", "a"
.align 4
.long 4 /* namesz */
.long 0 /* descsz */
.long 0x100 /* type = NT_GNU_BUILD_ATTRIBUTE_OPEN*/
.asciz "XYZ"
.section ".note.func", "a"
.align 4
.long 4 /* namesz */
.long 0 /* descsz */
.long 0x101 /* type = NT_GNU_BUILD_ATTRIBUTE_FUNC*/
.asciz "XYZ"

32
llvm/tools/llvm-readobj/ELFDumper.cpp
View File

@ -3489,6 +3489,24 @@ void GNUStyle<ELFT>::printAddrsig(const ELFFile<ELFT> *Obj) {
OS << "GNUStyle::printAddrsig not implemented\n";
}
static StringRef getGenericNoteTypeName(const uint32_t NT) {
static const struct {
uint32_t ID;
const char *Name;
} Notes[] = {
{ELF::NT_VERSION, "NT_VERSION (version)"},
{ELF::NT_ARCH, "NT_ARCH (architecture)"},
{ELF::NT_GNU_BUILD_ATTRIBUTE_OPEN, "OPEN"},
{ELF::NT_GNU_BUILD_ATTRIBUTE_FUNC, "func"},
};
for (const auto &Note : Notes)
if (Note.ID == NT)
return Note.Name;
return "";
}
static std::string getGNUNoteTypeName(const uint32_t NT) {
static const struct {
uint32_t ID;
@ -3877,7 +3895,11 @@ void GNUStyle<ELFT>::printNotes(const ELFFile<ELFT> *Obj) {
if (!N.Type.empty())
OS << " " << N.Type << ":\n " << N.Value << '\n';
} else {
OS << "Unknown note type: (" << format_hex(Type, 10) << ')';
StringRef NoteType = getGenericNoteTypeName(Type);
if (!NoteType.empty())
OS << NoteType;
else
OS << "Unknown note type: (" << format_hex(Type, 10) << ')';
}
OS << '\n';
};
@ -4682,8 +4704,12 @@ void LLVMStyle<ELFT>::printNotes(const ELFFile<ELFT> *Obj) {
if (!N.Type.empty())
W.printString(N.Type, N.Value);
} else {
W.printString("Type",
"Unknown (" + to_string(format_hex(Type, 10)) + ")");
StringRef NoteType = getGenericNoteTypeName(Type);
if (!NoteType.empty())
W.printString("Type", NoteType);
else
W.printString("Type",
"Unknown (" + to_string(format_hex(Type, 10)) + ")");
}
};