[llvm-readelf] - Remove the precompiled binary from gnu-hash-symbols.test.

[grimar]

Summary

I am working on https://bugs.llvm.org/show_bug.cgi?id=42622
and this patch reworks the gnu-hash-symbols.test so that it
will be easier to expand it with x86_64 case.

[MaskRay]

test/tools/llvm-readobj/gnu-hash-symbols.test

0

Rename gnu-hash-symbols.test to elf-hash-symbols.test (or other better name)

This files tests both .hash (SysV hash) and .gnu.hash (GNU hash).

29

Here and below it -> Here and below

Or better, just explicitly mention that the contents of .hash and .gnu.hash were generated by a linker.

[grimar]

• Addressed review comments.

[jhenderson]

test/tools/llvm-readobj/elf-hash-symbols.test

5

I wonder if we should add --strict-whitespace/--match-full-lines to this. That will ensure spacing is correct. What do you think?

21

I think you need to test that there's nothing after the last line, to show that there are no more entries in .gnu.hash.

49

Perhaps you should explain what 0x2C is (I think it's the size of .hash, right?)

79

Do you think there's value for testing the case with exactly one of .hash or .gnu.hash?

[MaskRay]

test/tools/llvm-readobj/elf-hash-symbols.test

4

%t1-386.o -> %t1-386.so

It is weird to name an ET_DYN *.o

49

PT_LOAD's p_offset

Nit: I think the usage here is a bit unusual. Normally a PT_DYNAMIC is created to contain .dynamic and at runtime the rtld decodes .dynamic entries by finding the PT_DYNAMIC address.

Maybe you can create a PT_DYNAMIC to make the test look more reasonable?

If you decide to do that, delete - Section: .dynamic from the PT_LOAD.

79

I think it is fine not to test that...

[grimar]

• Addressed review comments.

test/tools/llvm-readobj/elf-hash-symbols.test

5

Yep, makes sense, done.

49

I expanded the comment to reveal the full picture of how the computation happen.

Note that in this test case both .hash and .gnu.hash have section VAs = 0
(yaml2obj doesn't set it). So I tried to explain the underhood without using
a wordings like "address of hash section".

79

I do not mind. Done.

Side question: if we have a file with dynamic table that has DT_HASH and DT_GNU_HASH tags
and we have .hash and .gnu.hash sections. Do you think that llvm-objcopy should remove DT_HASH if we remove a .hash section?
(Does not seem GNU objcopy do that, I only did a quick test though, doesn't seem it is correct to keep it).

[grimar]

I did not see MaskRay`s comments. Going to address them.

[grimar]

• Addressed review comments.

test/tools/llvm-readobj/elf-hash-symbols.test

4

Done.

49

Nit: I think the usage here is a bit unusual. Normally a PT_DYNAMIC is created to contain .dynamic and at runtime the rtld decodes .dynamic entries by finding the PT_DYNAMIC address.

But we are testing here the logic of llvm-readelf. It does not need PT_DYNAMIC to dump the hash tables.

[grimar]

test/tools/llvm-readobj/elf-hash-symbols.test

49

Moreover, I think we could improve dumper to be able to dump these section even without any .dynamic section at all.
They have the unique types: SHT_HASH and SHT_GNU_HASH. It should be possible do do that.

[MaskRay]

test/tools/llvm-readobj/elf-hash-symbols.test

49

Not having PT_DYNAMIC should be fine.

One more nit: it made me puzzled because .dynamic is writable and contained in the PT_LOAD but the PT_LOAD is not writable..

You can delete the SHF_WRITE flag from .dynamic (it doesn't include DT_DEBUG so it is not necessarily writable).

Moreover, I think we could improve dumper to be able to dump these section even without any .dynamic section at all.
They have the unique types: SHT_HASH and SHT_GNU_HASH. It should be possible do do that.

GNU objcopy just locates the dynamic section with either PT_DYNAMIC or .dynamic, then decodes DT_HASH and/or DT_GNU_HASH. It doesn't check SHT_HASH or SHT_GNU_HASH probably because the section header is optional in ET_DYN/ET_EXEC. However, PT_DYNAMIC must be available for the hash tables to be recognized by ld.so, so objcopy doesn't bother implementing the logic.

219

%t4.so

[jhenderson]

test/tools/llvm-readobj/elf-hash-symbols.test

8

HASH-I386 -> HASH-32

79

I don't think llvm-objcopy should be modifying the contents of the .dynamic section or any other loadable section, with the exception of removing the contents of sections where we explicitly request to remove them. Doing so can mess up addresses and so on.

[grimar]

• Addressed review comments.

test/tools/llvm-readobj/elf-hash-symbols.test

49

GNU objcopy just locates the dynamic section with either PT_DYNAMIC or .dynamic, then decodes DT_HASH and/or DT_GNU_HASH. It doesn't check SHT_HASH or SHT_GNU_HASH probably because the section header is optional in ET_DYN/ET_EXEC. However, PT_DYNAMIC must be available for the hash tables to be recognized by ld.so, so objcopy doesn't bother implementing the logic.

Sorry if I am missing something, but this patch is for llvm-readelf. Did you mean GNU readelf?
(probably not, because as far I remember GNU readelf does not find .dynamic without PT_DYNAMIC though my memories are not strong right now about the difference we have atm).
But anyways what I was thinking of is the following logic: in llvm-readelf for dumping objects we can:

1. Try to find .dynamic and DT_HASH/DT_GNU_HASH, read the hash tables on success. (that is what we already do)
2. If (1) fails, then try to use the SHT_HASH/SHT_GNU_HASH we found (probably) earlier during the sections scan. I.e. read the content directly using sections headers info if available. (new)

That would allow us to dump more information in a broken objects. At least it seems would be useful for the test cases like that.
Does it make sense?

219

Oh, thanks.

[jhenderson]

LGTM, but obviously wait for @MaskRay's comments.

[grimar]

Plan a minor change.

test/tools/llvm-readobj/elf-hash-symbols.test

49

You can delete the SHF_WRITE flag from .dynamic (it doesn't include DT_DEBUG so it is not necessarily writable).

I think I missed this one. Going to remove it.

[MaskRay]

test/tools/llvm-readobj/elf-hash-symbols.test

49

If (1) fails, then try to use the SHT_HASH/SHT_GNU_HASH we found (probably) earlier during the sections scan. I.e. read the content directly using sections headers info if available. (new)

My feeling is that just locating DT_HASH and DT_GNU_HASH should be good enough. There may be cases that both 1) PT_DYNAMIC is broken and 2) .dynamic is missing. In these cases, locating SHT_HASH/SHT_GNU_HASH as a fallback will still allow us to dump hash tables (your proposal). My feeling is that these cases may be rare enough that we don't need to do so. (I wanted to save you the work but I will not be opposed to the idea if you insist on implementing it...)

test/tools/llvm-readobj/elf-hash-symbols.test

+## Check llvm-readelf is able to dump the content of hash sections correctly.
+
+## Check the output when both .hash and .gnu.hash sections are present.
+
+# RUN: yaml2obj --docnum=1 %s -o %t1-32.so
+# RUN: llvm-readelf --hash-symbols %t1-32.so \
+# RUN:   | FileCheck %s --strict-whitespace --match-full-lines --check-prefix HASH-32
+
+# HASH-32: Symbol table of .hash for image:
+# HASH-32-NEXT:  Num Buc:    Value  Size   Type   Bind Vis      Ndx Name
+# HASH-32-NEXT:    1   0: 00000000     0 NOTYPE  GLOBAL DEFAULT UND ccc
+# HASH-32-NEXT:    5   0: 00001001     0 NOTYPE  WEAK   DEFAULT   1 bbb
+# HASH-32-NEXT:    3   0: 00000001     0 NOTYPE  GLOBAL DEFAULT ABS ddd
+# HASH-32-NEXT:    2   0: 00001000     0 NOTYPE  GLOBAL DEFAULT   1 aaa
+# HASH-32-NEXT:    4   0: 00000000     0 NOTYPE  GLOBAL DEFAULT   2 eee
+# HASH-32-EMPTY:
+# HASH-32: Symbol table of .gnu.hash for image:
+# HASH-32-NEXT:  Num Buc:    Value  Size   Type   Bind Vis      Ndx Name
+# HASH-32-NEXT:    2   1: 00001000     0 NOTYPE  GLOBAL DEFAULT   1 aaa
+# HASH-32-NEXT:    3   1: 00000001     0 NOTYPE  GLOBAL DEFAULT ABS ddd
+# HASH-32-NEXT:    4   2: 00000000     0 NOTYPE  GLOBAL DEFAULT   2 eee
+# HASH-32-NEXT:    5   2: 00001001     0 NOTYPE  WEAK   DEFAULT   1 bbb
+# HASH-32-NOT: {{.}}
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS32
+  Data:    ELFDATA2LSB
+  Type:    ET_DYN
+  Machine: EM_386
+Sections:
+## The contents of .hash and .gnu.hash were generated by a linker.
+  - Name:    .hash
+    Type:    SHT_HASH
+    Flags:   [ SHF_ALLOC ]
+    Link:    .dynsym
+    Content: '0300000006000000010000000000000000000000000000000500000004000000020000000000000003000000'
+  - Name:    .gnu.hash
+    Type:    SHT_GNU_HASH
+    Flags:   [ SHF_ALLOC ]
+    Link:    .dynsym
+    Content: 0300000002000000010000000500000048991200000000000200000004000000685C880B9169880BF46D880BCB60880B
+  - Name:  .dynamic
+    Type:  SHT_DYNAMIC
+    Flags: [ SHF_WRITE, SHF_ALLOC ]
+    Link:  .dynstr
+    Entries:
+## PT_LOAD's p_vaddr is 0x0. PT_LOAD's p_offset = 0x1bc. DT_HASH value is 0x0. 
+## llvm-readelf will read .hash content from p_offset + (p_vaddr - DT_HASH value) = 0x1bc.
+## This matches the file offset of the .hash section.
+      - Tag:   DT_HASH
+        Value: 0x0000000000000000
+      - Tag:   DT_GNU_HASH
+## PT_LOAD's p_vaddr is 0x0. PT_LOAD's p_offset = 0x1bc. DT_GNU_HASH value is 0x2c (size of .hash = 0x2c).
+## llvm-readelf will read .gnu.hash content from p_offset + (p_vaddr - DT_GNU_HASH value) = 0x1e8.
+## This matches the file offset of the .gnu.hash section.
+        Value: 0x000000000000002C
+      - Tag:   DT_NULL
+        Value: 0x0000000000000000
+DynamicSymbols:
+  - Name:    ccc
+    Binding: STB_GLOBAL
+  - Name:    aaa
+    Section: .hash
+    Binding: STB_GLOBAL
+    Value:   0x0000000000001000
+  - Name:    ddd
+    Index:   SHN_ABS
+    Binding: STB_GLOBAL
+    Value:   0x0000000000000001
+  - Name:    eee
+    Section: .gnu.hash
+    Binding: STB_GLOBAL
+  - Name:    bbb
+    Section: .hash
+    Binding: STB_WEAK
+    Value:   0x0000000000001001
+ProgramHeaders:
+  - Type:  PT_LOAD
+    Flags: [ PF_R, PF_X ]
+    Sections:
+      - Section: .hash
+      - Section: .gnu.hash
+      - Section: .dynamic
+
+## Check the output when only .hash section is present.
+
+# RUN: yaml2obj --docnum=2 %s -o %t2-32.so
+# RUN: llvm-readelf --hash-symbols %t2-32.so \
+# RUN:   | FileCheck %s --strict-whitespace --match-full-lines --check-prefix ONLY-HASH-32
+
+# ONLY-HASH-32: Symbol table of .hash for image:
+# ONLY-HASH-32-NEXT:  Num Buc:    Value  Size   Type   Bind Vis      Ndx Name
+# ONLY-HASH-32-NEXT:    1   0: 00000000     0 NOTYPE  GLOBAL DEFAULT UND ccc
+# ONLY-HASH-32-NEXT:    5   0: 00001001     0 NOTYPE  WEAK   DEFAULT   1 bbb
+# ONLY-HASH-32-NEXT:    3   0: 00000001     0 NOTYPE  GLOBAL DEFAULT ABS ddd
+# ONLY-HASH-32-NEXT:    2   0: 00001000     0 NOTYPE  GLOBAL DEFAULT   1 aaa
+# ONLY-HASH-32-NEXT:    4   0: 00000000     0 NOTYPE  GLOBAL DEFAULT   2 eee
+# ONLY-HASH-32-NOT: {{.}}
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS32
+  Data:    ELFDATA2LSB
+  Type:    ET_DYN
+  Machine: EM_386
+Sections:
+## The contents of .hash was generated by a linker.
+  - Name:    .hash
+    Type:    SHT_HASH
+    Flags:   [ SHF_ALLOC ]
+    Link:    .dynsym
+    Content: '0300000006000000010000000000000000000000000000000500000004000000020000000000000003000000'
+  - Name:  .dynamic
+    Type:  SHT_DYNAMIC
+    Flags: [ SHF_WRITE, SHF_ALLOC ]
+    Link:  .dynstr
+    Entries:
+      - Tag:   DT_HASH
+        Value: 0x0000000000000000
+      - Tag:   DT_NULL
+        Value: 0x0000000000000000
+DynamicSymbols:
+  - Name:    ccc
+    Binding: STB_GLOBAL
+  - Name:    aaa
+    Section: .hash
+    Binding: STB_GLOBAL
+    Value:   0x0000000000001000
+  - Name:    ddd
+    Index:   SHN_ABS
+    Binding: STB_GLOBAL
+    Value:   0x0000000000000001
+  - Name:    eee
+    Section: .dynamic
+    Binding: STB_GLOBAL
+  - Name:    bbb
+    Section: .hash
+    Binding: STB_WEAK
+    Value:   0x0000000000001001
+ProgramHeaders:
+  - Type:  PT_LOAD
+    Flags: [ PF_R, PF_X ]
+    Sections:
+      - Section: .hash
+      - Section: .dynamic
+
+## Check the output when only .gnu.hash section is present.
+
+# RUN: yaml2obj --docnum=3 %s -o %t3-32.so
+# RUN: llvm-readelf --hash-symbols %t3-32.so \
+# RUN:   | FileCheck %s --strict-whitespace --match-full-lines --check-prefix ONLY-GNUHASH-32
+
+# ONLY-GNUHASH-32: Symbol table of .gnu.hash for image:
+# ONLY-GNUHASH-32-NEXT:  Num Buc:    Value  Size   Type   Bind Vis      Ndx Name
+# ONLY-GNUHASH-32-NEXT:    2   1: 00001000     0 NOTYPE  GLOBAL DEFAULT   2 aaa
+# ONLY-GNUHASH-32-NEXT:    3   1: 00000001     0 NOTYPE  GLOBAL DEFAULT ABS ddd
+# ONLY-GNUHASH-32-NEXT:    4   2: 00000000     0 NOTYPE  GLOBAL DEFAULT   1 eee
+# ONLY-GNUHASH-32-NEXT:    5   2: 00001001     0 NOTYPE  WEAK   DEFAULT   2 bbb
+# ONLY-GNUHASH-32-NOT: {{.}}
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS32
+  Data:    ELFDATA2LSB
+  Type:    ET_DYN
+  Machine: EM_386
+Sections:
+## The contents of .gnu.hash was generated by a linker.
+  - Name:    .gnu.hash
+    Type:    SHT_GNU_HASH
+    Flags:   [ SHF_ALLOC ]
+    Link:    .dynsym
+    Content: 0300000002000000010000000500000048991200000000000200000004000000685C880B9169880BF46D880BCB60880B
+  - Name:  .dynamic
+    Type:  SHT_DYNAMIC
+    Flags: [ SHF_WRITE, SHF_ALLOC ]
+    Link:  .dynstr
+    Entries:
+      - Tag:   DT_GNU_HASH
+        Value: 0x0000000000000000
+      - Tag:   DT_NULL
+        Value: 0x0000000000000000
+DynamicSymbols:
+  - Name:    ccc
+    Binding: STB_GLOBAL
+  - Name:    aaa
+    Section: .dynamic
+    Binding: STB_GLOBAL
+    Value:   0x0000000000001000
+  - Name:    ddd
+    Index:   SHN_ABS
+    Binding: STB_GLOBAL
+    Value:   0x0000000000000001
+  - Name:    eee
+    Section: .gnu.hash
+    Binding: STB_GLOBAL
+  - Name:    bbb
+    Section: .dynamic
+    Binding: STB_WEAK
+    Value:   0x0000000000001001
+ProgramHeaders:
+  - Type:  PT_LOAD
+    Flags: [ PF_R, PF_X ]
+    Sections:
+      - Section: .gnu.hash
+      - Section: .dynamic
+
+## Show that if there are no hash sections, we do not print anything.
+# RUN: yaml2obj --docnum=4 %s -o %t4.so
+# RUN: llvm-readelf --hash-symbols %t4.so \
+# RUN:   | FileCheck %s --check-prefix NO-HASH --allow-empty
+
+# NO-HASH-NOT: {{.}}
+
+## Sanity check that we can still find the dynamic symbols (i.e. the above test
+## doesn't pass due to a mistake in the dynamic section).
+# RUN: llvm-readelf --dyn-symbols %t4.so | FileCheck %s --check-prefix DYNSYMS
+
+# DYNSYMS: Symbol table '.dynsym' contains 2 entries:
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_DYN
+  Machine: EM_X86_64
+Sections:
+  - Name:         .dynstr
+    Type:         SHT_STRTAB
+    Flags:        [ SHF_ALLOC ]
+    AddressAlign: 0x100
+    EntSize:      0x1
+  - Name:         .dynsym
+    Type:         SHT_DYNSYM
+    Flags:        [ SHF_ALLOC ]
+    Link:         .dynstr
+    Address:      0x100
+    AddressAlign: 0x100
+    EntSize:      0x18
+  - Name:         .dynamic
+    Type:         SHT_DYNAMIC
+    Flags:        [ SHF_ALLOC ]
+    Address:      0x0000000000001000
+    Link:         .dynstr
+    AddressAlign: 0x0000000000001000
+    EntSize:      0x0000000000000010
+    Entries:
+      - Tag:   DT_STRTAB
+        Value: 0x0000000000000000
+      - Tag:   DT_STRSZ
+        Value: 0x0000000000000009
+      - Tag:   DT_SYMTAB
+        Value: 0x0000000000000100
+      - Tag:   DT_SYMENT
+        Value: 0x0000000000000018
+      - Tag:   DT_NULL
+        Value: 0x0000000000000000
+  - Name:  .text.foo
+    Type:  SHT_PROGBITS
+    Flags: [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
+    Size:  0x40
+    Address: 0x2000
+    AddressAlign: 0x2000
+DynamicSymbols:
+  - Name:    _Z3fooi
+    Binding: STB_GLOBAL
+ProgramHeaders:
+  - Type:  PT_LOAD
+    Flags: [ PF_R, PF_X ]
+    VAddr: 0x0
+    PAddr: 0x0
+    Sections:
+      - Section: .dynsym
+      - Section: .dynstr
+      - Section: .dynamic
+      - Section: .text.foo
+  - Type:  PT_DYNAMIC
+    Flags: [ PF_R ]
+    VAddr: 0x1000
+    PAddr: 0x1000
+    Sections:
+      - Section: .dynamic

test/tools/llvm-readobj/gnu-hash-symbols.test

-# RUN: llvm-readelf --hash-symbols %p/Inputs/dynamic-table-exe.x86 \
-# RUN:   | FileCheck %s --check-prefix HASH
-
-# HASH:     Symbol table of .hash for image:
-# HASH-NEXT:   Num Buc:    Value  Size   Type   Bind Vis      Ndx Name
-# HASH-NEXT:     9   0: 00000000     0 FUNC    GLOBAL DEFAULT UND __gxx_personality_v0@CXXABI_1.3
-# HASH-NEXT:    13   0: 00001b64     0 NOTYPE  GLOBAL DEFAULT ABS _edata{{$}}
-# HASH-NEXT:     7   0: 00000000     0 FUNC    GLOBAL DEFAULT UND _ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1EPKcSt13_Ios_Openmode@GLIBCXX_3.4
-# HASH-NEXT:     2   0: 00000000     0 NOTYPE  WEAK   DEFAULT UND _Jv_RegisterClasses{{$}}
-# HASH-NEXT:     1   0: 00000000     0 NOTYPE  WEAK   DEFAULT UND __gmon_start__{{$}}
-# HASH-NEXT:    16   1: 00000850    81 FUNC    GLOBAL DEFAULT  14 main{{$}}
-# HASH-NEXT:    10   1: 00000000     0 FUNC    GLOBAL DEFAULT UND _Unwind_Resume@GCC_3.0
-# HASH-NEXT:     8   1: 00000000     0 FUNC    GLOBAL DEFAULT UND puts@GLIBC_2.0
-# HASH-NEXT:    12   1: 00001b68     0 NOTYPE  GLOBAL DEFAULT ABS _end{{$}}
-# HASH-NEXT:     6   1: 00000000     0 FUNC    GLOBAL DEFAULT UND _ZNSt14basic_ifstreamIcSt11char_traitsIcEED1Ev@GLIBCXX_3.4
-# HASH-NEXT:     5   1: 00000000     0 NOTYPE  WEAK   DEFAULT UND _ITM_registerTMCloneTable{{$}}
-# HASH-NEXT:     4   1: 00000000     0 NOTYPE  WEAK   DEFAULT UND _ITM_deregisterTMCloneTable{{$}}
-# HASH-NEXT:     3   1: 00000000     0 FUNC    GLOBAL DEFAULT UND __libc_start_main@GLIBC_2.0
-# HASH-NEXT:    11   2: 00000000     0 FUNC    WEAK   DEFAULT UND __cxa_finalize@GLIBC_2.1.3
-# HASH-NEXT:    15   2: 00001b64     0 NOTYPE  GLOBAL DEFAULT ABS __bss_start{{$}}
-# HASH-NEXT:    14   2: 0000093c     4 OBJECT  GLOBAL DEFAULT  16 _IO_stdin_used{{$}}
-# HASH:     Symbol table of .gnu.hash for image:
-# HASH-NEXT:   Num Buc:    Value  Size   Type   Bind Vis      Ndx Name
-# HASH-NEXT:    12   0: 00001b68     0 NOTYPE  GLOBAL DEFAULT ABS _end{{$}}
-# HASH-NEXT:    13   0: 00001b64     0 NOTYPE  GLOBAL DEFAULT ABS _edata{{$}}
-# HASH-NEXT:    14   1: 0000093c     4 OBJECT  GLOBAL DEFAULT  16 _IO_stdin_used{{$}}
-# HASH-NEXT:    15   1: 00001b64     0 NOTYPE  GLOBAL DEFAULT ABS __bss_start{{$}}
-# HASH-NEXT:    16   1: 00000850    81 FUNC    GLOBAL DEFAULT  14 main{{$}}
-
-## Show that if there are no hash sections, we do not print anything.
-# RUN: yaml2obj %s -o %t.o
-# RUN: llvm-readelf --hash-symbols %t.o \
-# RUN:   | FileCheck %s --check-prefix NO-HASH --allow-empty
-
-# NO-HASH-NOT: {{.}}
-
-## Sanity check that we can still find the dynamic symbols (i.e. the above test
-## doesn't pass due to a mistake in the dynamic section).
-# RUN: llvm-readelf --dyn-symbols %t.o | FileCheck %s --check-prefix DYNSYMS
-
-# DYNSYMS: Symbol table '.dynsym' contains 2 entries:
-
-!ELF
-FileHeader:
-  Class:           ELFCLASS64
-  Data:            ELFDATA2LSB
-  Type:            ET_DYN
-  Machine:         EM_X86_64
-Sections:
-  - Name:         .dynstr
-    Type:         SHT_STRTAB
-    Flags:        [ SHF_ALLOC ]
-    AddressAlign: 0x100
-    EntSize:      0x1
-  - Name:         .dynsym
-    Type:         SHT_DYNSYM
-    Flags:        [ SHF_ALLOC ]
-    Link:         .dynstr
-    Address:      0x100
-    AddressAlign: 0x100
-    EntSize:      0x18
-  - Name:            .dynamic
-    Type:            SHT_DYNAMIC
-    Flags:           [ SHF_ALLOC ]
-    Address:         0x0000000000001000
-    Link:            .dynstr
-    AddressAlign:    0x0000000000001000
-    EntSize:         0x0000000000000010
-    Entries:
-      - Tag:             DT_STRTAB
-        Value:           0x0000000000000000
-      - Tag:             DT_STRSZ
-        Value:           0x0000000000000009
-      - Tag:             DT_SYMTAB
-        Value:           0x0000000000000100
-      - Tag:             DT_SYMENT
-        Value:           0x0000000000000018
-      - Tag:             DT_NULL
-        Value:           0x0000000000000000
-  - Name:  .text.foo
-    Type:  SHT_PROGBITS
-    Flags: [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
-    Size:  0x40
-    Address: 0x2000
-    AddressAlign: 0x2000
-DynamicSymbols:
-  - Name:    _Z3fooi
-    Binding: STB_GLOBAL
-ProgramHeaders:
-  - Type:  PT_LOAD
-    Flags: [ PF_R, PF_X ]
-    VAddr: 0x0
-    PAddr: 0x0
-    Sections:
-      - Section: .dynsym
-      - Section: .dynstr
-      - Section: .dynamic
-      - Section: .text.foo
-  - Type:  PT_DYNAMIC
-    Flags: [ PF_R ]
-    VAddr: 0x1000
-    PAddr: 0x1000
-    Sections:
-      - Section: .dynamic