[llvm-readobj][ELF] Show MIPS GOT content when there is another zero-sized section at the same address

It is possible to have .got section and one or more zero-sized section
at the same address. This patch first checks that GOT (or GOT PLT)
section should have non-zero size using corresponding dynamic tags. Then
it looks up not empty section at the specified address.

Differential Revision: http://reviews.llvm.org/D16968

llvm-svn: 260245

1 files changed, 45 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-readobj/mips-got-overlapped.test b/llvm/test/tools/llvm-readobj/mips-got-overlapped.test
new file mode 100644
index 00000000000..ae4ae953295
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/mips-got-overlapped.test
@@ -0,0 +1,45 @@
+# Check that llvm-readobj -mips-plt-got correctly shows .got section
+# content if there are some other zero-sized sections with the same
+# address as the .got. got-over.exe.elf-mips has zero-sized .data
+# section at the same offset .got section.
+
+RUN: llvm-readobj -mips-plt-got %p/Inputs/got-over.exe.elf-mips | FileCheck %s
+
+GOT-OBJ: Cannot find PLTGOT dynamic table tag.
+
+CHECK:      Primary GOT {
+CHECK-NEXT:   Canonical gp value: 0x418270
+CHECK-NEXT:   Reserved entries [
+CHECK-NEXT:     Entry {
+CHECK-NEXT:       Address: 0x410280
+CHECK-NEXT:       Access: -32752
+CHECK-NEXT:       Initial: 0x0
+CHECK-NEXT:       Purpose: Lazy resolver
+CHECK-NEXT:     }
+CHECK-NEXT:     Entry {
+CHECK-NEXT:       Address: 0x410284
+CHECK-NEXT:       Access: -32748
+CHECK-NEXT:       Initial: 0x80000000
+CHECK-NEXT:       Purpose: Module pointer (GNU extension)
+CHECK-NEXT:     }
+CHECK-NEXT:   ]
+CHECK-NEXT:   Local entries [
+CHECK-NEXT:     Entry {
+CHECK-NEXT:       Address: 0x410288
+CHECK-NEXT:       Access: -32744
+CHECK-NEXT:       Initial: 0x4001B8
+CHECK-NEXT:     }
+CHECK-NEXT:   ]
+CHECK-NEXT:   Global entries [
+CHECK-NEXT:     Entry {
+CHECK-NEXT:       Address: 0x41028C
+CHECK-NEXT:       Access: -32740
+CHECK-NEXT:       Initial: 0x0
+CHECK-NEXT:       Value: 0x0
+CHECK-NEXT:       Type: None
+CHECK-NEXT:       Section: Undefined
+CHECK-NEXT:       Name: _foo
+CHECK-NEXT:     }
+CHECK-NEXT:   ]
+CHECK-NEXT:   Number of TLS and multi-GOT entries: 0
+CHECK-NEXT: }