[llvm-readobj] - Teach llvm-readobj to dump .note.gnu.property sections.
NT_GNU_PROPERTY_TYPE_0 is a recently added type of .note.gnu.property
section specified in Linux Extensions to gABI.
(https://github.com/hjl-tools/linux-abi/wiki/Linux-Extensions-to-gABI)
Patch teach tool to print such notes properly.
Differential revision: https://reviews.llvm.org/D44469
llvm-svn: 328078
diff --git a/llvm/include/llvm/BinaryFormat/ELF.h b/llvm/include/llvm/BinaryFormat/ELF.h
index d04aac9..1b811cc 100644
--- a/llvm/include/llvm/BinaryFormat/ELF.h
+++ b/llvm/include/llvm/BinaryFormat/ELF.h
@@ -1440,6 +1440,13 @@
NT_GNU_HWCAP = 2,
NT_GNU_BUILD_ID = 3,
NT_GNU_GOLD_VERSION = 4,
+ NT_GNU_PROPERTY_TYPE_0 = 5,
+};
+
+// Property types used in GNU_PROPERTY_TYPE_0 notes.
+enum {
+ GNU_PROPERTY_STACK_SIZE = 1,
+ GNU_PROPERTY_NO_COPY_ON_PROTECTED = 2,
};
// AMDGPU specific notes.
diff --git a/llvm/test/tools/llvm-readobj/note-gnu-property.s b/llvm/test/tools/llvm-readobj/note-gnu-property.s
new file mode 100644
index 0000000..6fd6908
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/note-gnu-property.s
@@ -0,0 +1,68 @@
+// REQUIRES: x86-registered-target
+// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o %t
+// RUN: llvm-readobj -elf-output-style GNU --notes %t | FileCheck %s
+
+// CHECK: Displaying notes found at file offset 0x00000040 with length 0x00000070:
+// CHECK-NEXT: Owner Data size Description
+// CHECK-NEXT: GNU 0x00000060 NT_GNU_PROPERTY_TYPE_0 (property note)
+// CHECK-NEXT: Properties: stack size: 0x100
+// CHECK-NEXT: stack size: 0x100
+// CHECK-NEXT: no copy on protected
+// CHECK-NEXT: <application-specific type 0xfefefefe>
+// CHECK-NEXT: stack size: <corrupt length: 0x0>
+// CHECK-NEXT: stack size: <corrupt length: 0x4>
+// CHECK-NEXT: no copy on protected <corrupt length: 0x1>
+// CHECK-NEXT: <corrupt type (0x2) datasz: 0x1>
+
+.section ".note.gnu.property", "a"
+.align 4
+ .long 4 /* Name length is always 4 ("GNU") */
+ .long end - begin /* Data length */
+ .long 5 /* Type: NT_GNU_PROPERTY_TYPE_0 */
+ .asciz "GNU" /* Name */
+ .p2align 3
+begin:
+ .long 1 /* Type: GNU_PROPERTY_STACK_SIZE */
+ .long 8 /* Data size */
+ .quad 0x100 /* Data (stack size) */
+ .p2align 3 /* Align to 8 byte for 64 bit */
+
+ /* Test we handle alignment properly */
+ .long 1 /* Type: GNU_PROPERTY_STACK_SIZE */
+ .long 8 /* Data size */
+ .long 0x100 /* Data (stack size) */
+ .p2align 3 /* Align to 8 byte for 64 bit */
+
+ .long 2 /* Type: GNU_PROPERTY_NO_COPY_ON_PROTECTED */
+ .long 0 /* Data size */
+ .p2align 3 /* Align to 8 byte for 64 bit */
+
+ /* All notes below are broken. Test we are able to report them. */
+
+ /* Broken note type */
+ .long 0xfefefefe /* Invalid type for testing */
+ .long 0 /* Data size */
+ .p2align 3 /* Align to 8 byte for 64 bit */
+
+ /* GNU_PROPERTY_STACK_SIZE with zero stack size */
+ .long 1 /* Type: GNU_PROPERTY_STACK_SIZE */
+ .long 0 /* Data size */
+ .p2align 3 /* Align to 8 byte for 64 bit */
+
+ /* GNU_PROPERTY_STACK_SIZE with data size 4 (should be 8) */
+ .long 1 /* Type: GNU_PROPERTY_STACK_SIZE */
+ .long 4 /* Data size */
+ .long 0x100 /* Data (stack size) */
+ .p2align 3 /* Align to 8 byte for 64 bit */
+
+ /* GNU_PROPERTY_NO_COPY_ON_PROTECTED with pr_datasz and some data */
+ .long 2 /* Type: GNU_PROPERTY_NO_COPY_ON_PROTECTED */
+ .long 1 /* Data size (corrupted) */
+ .byte 1 /* Data */
+ .p2align 3 /* Align to 8 byte for 64 bit */
+
+ /* GNU_PROPERTY_NO_COPY_ON_PROTECTED with pr_datasz and without data */
+ .long 2 /* Type: GNU_PROPERTY_NO_COPY_ON_PROTECTED */
+ .long 1 /* Data size (corrupted) */
+ .p2align 3 /* Align to 8 byte for 64 bit */
+end:
diff --git a/llvm/test/tools/llvm-readobj/note-gnu-property2.s b/llvm/test/tools/llvm-readobj/note-gnu-property2.s
new file mode 100644
index 0000000..fe6be0c
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/note-gnu-property2.s
@@ -0,0 +1,22 @@
+// REQUIRES: x86-registered-target
+// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o %t
+// RUN: llvm-readobj -elf-output-style GNU --notes %t | FileCheck %s
+
+// CHECK: Displaying notes found at file offset 0x00000040 with length 0x00000014:
+// CHECK-NEXT: Owner Data size Description
+// CHECK-NEXT: GNU 0x00000004 NT_GNU_PROPERTY_TYPE_0 (property note)
+// CHECK-NEXT: Properties:
+// CHECK-NEXT: <corrupted GNU_PROPERTY_TYPE_0>
+
+// Section below is broken, check we report that.
+
+.section ".note.gnu.property", "a"
+.align 4
+ .long 4 /* Name length is always 4 ("GNU") */
+ .long end - begin /* Data length */
+ .long 5 /* Type: NT_GNU_PROPERTY_TYPE_0 */
+ .asciz "GNU" /* Name */
+ .p2align 3
+begin:
+ .long 1 /* Type: GNU_PROPERTY_STACK_SIZE */
+end:
diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index 8d62864..b41d431 100644
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -3412,6 +3412,7 @@
{ELF::NT_GNU_HWCAP, "NT_GNU_HWCAP (DSO-supplied software HWCAP info)"},
{ELF::NT_GNU_BUILD_ID, "NT_GNU_BUILD_ID (unique build ID bitstring)"},
{ELF::NT_GNU_GOLD_VERSION, "NT_GNU_GOLD_VERSION (gold version)"},
+ {ELF::NT_GNU_PROPERTY_TYPE_0, "NT_GNU_PROPERTY_TYPE_0 (property note)"},
};
for (const auto &Note : Notes)
@@ -3476,8 +3477,35 @@
}
template <typename ELFT>
+static void printGNUProperty(raw_ostream &OS, uint32_t Type, uint32_t DataSize,
+ ArrayRef<uint8_t> Data) {
+ switch (Type) {
+ default:
+ OS << format(" <application-specific type 0x%x>\n", Type);
+ return;
+ case GNU_PROPERTY_STACK_SIZE: {
+ OS << " stack size: ";
+ if (DataSize == sizeof(typename ELFT::uint))
+ OS << format("0x%x\n",
+ (uint64_t)(*(const typename ELFT::Addr *)Data.data()));
+ else
+ OS << format("<corrupt length: 0x%x>\n", DataSize);
+ break;
+ }
+ case GNU_PROPERTY_NO_COPY_ON_PROTECTED:
+ OS << " no copy on protected";
+ if (DataSize)
+ OS << format(" <corrupt length: 0x%x>", DataSize);
+ OS << "\n";
+ break;
+ }
+}
+
+template <typename ELFT>
static void printGNUNote(raw_ostream &OS, uint32_t NoteType,
ArrayRef<typename ELFT::Word> Words, size_t Size) {
+ using Elf_Word = typename ELFT::Word;
+
switch (NoteType) {
default:
return;
@@ -3509,8 +3537,31 @@
OS << " Version: "
<< StringRef(reinterpret_cast<const char *>(Words.data()), Size);
break;
- }
+ case ELF::NT_GNU_PROPERTY_TYPE_0:
+ OS << " Properties:";
+ ArrayRef<uint8_t> Arr(reinterpret_cast<const uint8_t *>(Words.data()),
+ Size);
+ while (Arr.size() >= 8) {
+ uint32_t Type = *reinterpret_cast<const Elf_Word *>(Arr.data());
+ uint32_t DataSize = *reinterpret_cast<const Elf_Word *>(Arr.data() + 4);
+ Arr = Arr.drop_front(8);
+
+ // Take padding size into account if present.
+ uint64_t PaddedSize = alignTo(DataSize, sizeof(typename ELFT::uint));
+ if (Arr.size() < PaddedSize) {
+ OS << format(" <corrupt type (0x%x) datasz: 0x%x>\n", Type,
+ DataSize);
+ break;
+ }
+ printGNUProperty<ELFT>(OS, Type, DataSize, Arr.take_front(PaddedSize));
+ Arr = Arr.drop_front(PaddedSize);
+ }
+
+ if (!Arr.empty())
+ OS << " <corrupted GNU_PROPERTY_TYPE_0>";
+ break;
+ }
OS << '\n';
}