[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

2 files changed, 90 insertions, 0 deletions

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 00000000000..6fd69086612
--- /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 00000000000..fe6be0c9bcb
--- /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: