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llvm/test/tools/obj2yaml/dynamic-section.test
T
Xing GUO e4bca8dc71 [BinaryFormat] Add DT_USED tag into dynamic section. 
Summary:
This tag is documented in https://docs.oracle.com/cd/E19253-01/817-1984/chapter6-42444/index.html 
Though I could not find some docs that describe it in detail, I found some code snippets.

1.
```
	/*
	 * Look up the string in the string table and get its offset. If
	 * this succeeds, then it is possible that there is a DT_NEEDED
	 * dynamic entry that references it.
	 */
	have_string = elfedit_sec_findstr(argstate->str.sec,
	    strpad_elt.dn_dyn.d_un.d_val, arg, &str_offset) != 0;
	if (have_string) {
		dyn = argstate->dynamic.data;
		for (ndx = 0; ndx < numdyn; dyn++, ndx++) {
			if (((dyn->d_tag == DT_NEEDED) ||
			    (dyn->d_tag == DT_USED)) &&
			    (dyn->d_un.d_val == str_offset))
				goto done;
		}
	}
```
https://github.com/kofemann/opensolaris/blob/80192cd83bf665e708269dae856f9145f7190f74/usr/src/cmd/sgs/elfedit/modules/common/syminfo.c#L512

2.
```
    case DT_USED:
    case DT_INIT_ARRAY:
    case DT_FINI_ARRAY:
      if (do_dynamic)
        {
          if (entry->d_tag == DT_USED
          && VALID_DYNAMIC_NAME (entry->d_un.d_val))
        {
          char *name = GET_DYNAMIC_NAME (entry->d_un.d_val);

          if (*name)
            {
              printf (_("Not needed object: [%s]\n"), name);
              break;
            }
        }

          print_vma (entry->d_un.d_val, PREFIX_HEX);
          putchar ('\n');
        }
      break;
```
http://web.mit.edu/freebsd/head/contrib/binutils/binutils/readelf.c

3.
```
#define DT_USED     0x7ffffffe  /* ignored - same as needed */
```
https://github.com/switchbrew/switch-tools/blob/master/src/elf_common.h

Reviewers: jhenderson, grimar

Reviewed By: jhenderson, grimar

Subscribers: emaste, krytarowski, fedor.sergeev, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58762

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355468 91177308-0d34-0410-b5e6-96231b3b80d8
2019-03-06 01:28:40 +00:00

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# RUN: yaml2obj %s -o %t
# RUN: obj2yaml %t | FileCheck %s
## Check we can use obj2yaml to yamalize the object containing
## .dynamic section. Check that resulting section has the
## proper attributes and dynamic tags.
# CHECK: Sections:
# CHECK-NEXT: - Name: .dynamic
# CHECK-NEXT: Type: SHT_DYNAMIC
# CHECK-NEXT: Address: 0x0000000000001000
# CHECK-NEXT: AddressAlign: 0x0000000000002000
# CHECK-NEXT: EntSize: 0x0000000000000010
# CHECK-NEXT: Entries:
# CHECK-NEXT: - Tag: DT_NULL
# CHECK-NEXT: Value: 0x0000000000000000
# CHECK-NEXT: - Tag: DT_NEEDED
# CHECK-NEXT: Value: 0x0000000000000001
# CHECK-NEXT: - Tag: DT_PLTRELSZ
# CHECK-NEXT: Value: 0x0000000000000002
# CHECK-NEXT: - Tag: DT_PLTGOT
# CHECK-NEXT: Value: 0x0000000000000003
# CHECK-NEXT: - Tag: DT_HASH
# CHECK-NEXT: Value: 0x0000000000000004
# CHECK-NEXT: - Tag: DT_STRTAB
# CHECK-NEXT: Value: 0x0000000000000005
# CHECK-NEXT: - Tag: DT_SYMTAB
# CHECK-NEXT: Value: 0x0000000000000006
# CHECK-NEXT: - Tag: DT_RELA
# CHECK-NEXT: Value: 0x0000000000000007
# CHECK-NEXT: - Tag: DT_RELASZ
# CHECK-NEXT: Value: 0x0000000000000008
# CHECK-NEXT: - Tag: DT_RELAENT
# CHECK-NEXT: Value: 0x0000000000000009
# CHECK-NEXT: - Tag: DT_STRSZ
# CHECK-NEXT: Value: 0x000000000000000A
# CHECK-NEXT: - Tag: DT_SYMENT
# CHECK-NEXT: Value: 0x000000000000000B
# CHECK-NEXT: - Tag: DT_INIT
# CHECK-NEXT: Value: 0x000000000000000C
# CHECK-NEXT: - Tag: DT_FINI
# CHECK-NEXT: Value: 0x000000000000000D
# CHECK-NEXT: - Tag: DT_SONAME
# CHECK-NEXT: Value: 0x000000000000000E
# CHECK-NEXT: - Tag: DT_RPATH
# CHECK-NEXT: Value: 0x000000000000000F
# CHECK-NEXT: - Tag: DT_SYMBOLIC
# CHECK-NEXT: Value: 0x0000000000000010
# CHECK-NEXT: - Tag: DT_REL
# CHECK-NEXT: Value: 0x0000000000000011
# CHECK-NEXT: - Tag: DT_RELSZ
# CHECK-NEXT: Value: 0x0000000000000012
# CHECK-NEXT: - Tag: DT_RELENT
# CHECK-NEXT: Value: 0x0000000000000013
# CHECK-NEXT: - Tag: DT_PLTREL
# CHECK-NEXT: Value: 0x0000000000000014
# CHECK-NEXT: - Tag: DT_DEBUG
# CHECK-NEXT: Value: 0x0000000000000015
# CHECK-NEXT: - Tag: DT_TEXTREL
# CHECK-NEXT: Value: 0x0000000000000016
# CHECK-NEXT: - Tag: DT_JMPREL
# CHECK-NEXT: Value: 0x0000000000000017
# CHECK-NEXT: - Tag: DT_BIND_NOW
# CHECK-NEXT: Value: 0x0000000000000018
# CHECK-NEXT: - Tag: DT_INIT_ARRAY
# CHECK-NEXT: Value: 0x0000000000000019
# CHECK-NEXT: - Tag: DT_FINI_ARRAY
# CHECK-NEXT: Value: 0x000000000000001A
# CHECK-NEXT: - Tag: DT_INIT_ARRAYSZ
# CHECK-NEXT: Value: 0x000000000000001B
# CHECK-NEXT: - Tag: DT_FINI_ARRAYSZ
# CHECK-NEXT: Value: 0x000000000000001C
# CHECK-NEXT: - Tag: DT_RUNPATH
# CHECK-NEXT: Value: 0x000000000000001D
# CHECK-NEXT: - Tag: DT_FLAGS
# CHECK-NEXT: Value: 0x000000000000001E
# CHECK-NEXT: - Tag: DT_PREINIT_ARRAY
# CHECK-NEXT: Value: 0x000000000000001F
# CHECK-NEXT: - Tag: DT_PREINIT_ARRAYSZ
# CHECK-NEXT: Value: 0x0000000000000020
# CHECK-NEXT: - Tag: DT_SYMTAB_SHNDX
# CHECK-NEXT: Value: 0x0000000000000021
# CHECK-NEXT: - Tag: DT_RELRSZ
# CHECK-NEXT: Value: 0x0000000000000022
# CHECK-NEXT: - Tag: DT_RELR
# CHECK-NEXT: Value: 0x0000000000000023
# CHECK-NEXT: - Tag: DT_RELRENT
# CHECK-NEXT: Value: 0x0000000000000024
# CHECK-NEXT: - Tag: DT_ANDROID_REL
# CHECK-NEXT: Value: 0x0000000000000025
# CHECK-NEXT: - Tag: DT_ANDROID_RELSZ
# CHECK-NEXT: Value: 0x0000000000000026
# CHECK-NEXT: - Tag: DT_ANDROID_RELA
# CHECK-NEXT: Value: 0x0000000000000027
# CHECK-NEXT: - Tag: DT_ANDROID_RELASZ
# CHECK-NEXT: Value: 0x0000000000000028
# CHECK-NEXT: - Tag: DT_ANDROID_RELR
# CHECK-NEXT: Value: 0x0000000000000029
# CHECK-NEXT: - Tag: DT_ANDROID_RELRSZ
# CHECK-NEXT: Value: 0x000000000000002A
# CHECK-NEXT: - Tag: DT_ANDROID_RELRENT
# CHECK-NEXT: Value: 0x000000000000002B
# CHECK-NEXT: - Tag: DT_GNU_HASH
# CHECK-NEXT: Value: 0x000000000000002C
# CHECK-NEXT: - Tag: DT_TLSDESC_PLT
# CHECK-NEXT: Value: 0x000000000000002D
# CHECK-NEXT: - Tag: DT_TLSDESC_GOT
# CHECK-NEXT: Value: 0x000000000000002E
# CHECK-NEXT: - Tag: DT_RELACOUNT
# CHECK-NEXT: Value: 0x000000000000002F
# CHECK-NEXT: - Tag: DT_RELCOUNT
# CHECK-NEXT: Value: 0x0000000000000030
# CHECK-NEXT: - Tag: DT_FLAGS_1
# CHECK-NEXT: Value: 0x0000000000000031
# CHECK-NEXT: - Tag: DT_VERSYM
# CHECK-NEXT: Value: 0x0000000000000032
# CHECK-NEXT: - Tag: DT_VERDEF
# CHECK-NEXT: Value: 0x0000000000000033
# CHECK-NEXT: - Tag: DT_VERDEFNUM
# CHECK-NEXT: Value: 0x0000000000000034
# CHECK-NEXT: - Tag: DT_VERNEED
# CHECK-NEXT: Value: 0x0000000000000035
# CHECK-NEXT: - Tag: DT_VERNEEDNUM
# CHECK-NEXT: Value: 0x0000000000000036
# CHECK-NEXT: - Tag: DT_USED
# CHECK-NEXT: Value: 0x0000000000000001
!ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .dynamic
Type: SHT_DYNAMIC
Address: 0x0000000000001000
AddressAlign: 0x0000000000002000
EntSize: 0x0000000000000010
Entries:
- Tag: DT_NULL
Value: 0x0000000000000000
- Tag: DT_NEEDED
Value: 0x0000000000000001
- Tag: DT_PLTRELSZ
Value: 0x0000000000000002
- Tag: DT_PLTGOT
Value: 0x0000000000000003
- Tag: DT_HASH
Value: 0x0000000000000004
- Tag: DT_STRTAB
Value: 0x0000000000000005
- Tag: DT_SYMTAB
Value: 0x0000000000000006
- Tag: DT_RELA
Value: 0x0000000000000007
- Tag: DT_RELASZ
Value: 0x0000000000000008
- Tag: DT_RELAENT
Value: 0x0000000000000009
- Tag: DT_STRSZ
Value: 0x000000000000000A
- Tag: DT_SYMENT
Value: 0x000000000000000B
- Tag: DT_INIT
Value: 0x000000000000000C
- Tag: DT_FINI
Value: 0x000000000000000D
- Tag: DT_SONAME
Value: 0x000000000000000E
- Tag: DT_RPATH
Value: 0x000000000000000F
- Tag: DT_SYMBOLIC
Value: 0x0000000000000010
- Tag: DT_REL
Value: 0x0000000000000011
- Tag: DT_RELSZ
Value: 0x0000000000000012
- Tag: DT_RELENT
Value: 0x0000000000000013
- Tag: DT_PLTREL
Value: 0x0000000000000014
- Tag: DT_DEBUG
Value: 0x0000000000000015
- Tag: DT_TEXTREL
Value: 0x0000000000000016
- Tag: DT_JMPREL
Value: 0x0000000000000017
- Tag: DT_BIND_NOW
Value: 0x0000000000000018
- Tag: DT_INIT_ARRAY
Value: 0x0000000000000019
- Tag: DT_FINI_ARRAY
Value: 0x000000000000001A
- Tag: DT_INIT_ARRAYSZ
Value: 0x000000000000001B
- Tag: DT_FINI_ARRAYSZ
Value: 0x000000000000001C
- Tag: DT_RUNPATH
Value: 0x000000000000001D
- Tag: DT_FLAGS
Value: 0x000000000000001E
- Tag: DT_PREINIT_ARRAY
Value: 0x000000000000001F
- Tag: DT_PREINIT_ARRAYSZ
Value: 0x0000000000000020
- Tag: DT_SYMTAB_SHNDX
Value: 0x0000000000000021
- Tag: DT_RELRSZ
Value: 0x0000000000000022
- Tag: DT_RELR
Value: 0x0000000000000023
- Tag: DT_RELRENT
Value: 0x0000000000000024
- Tag: DT_ANDROID_REL
Value: 0x0000000000000025
- Tag: DT_ANDROID_RELSZ
Value: 0x0000000000000026
- Tag: DT_ANDROID_RELA
Value: 0x0000000000000027
- Tag: DT_ANDROID_RELASZ
Value: 0x0000000000000028
- Tag: DT_ANDROID_RELR
Value: 0x0000000000000029
- Tag: DT_ANDROID_RELRSZ
Value: 0x000000000000002A
- Tag: DT_ANDROID_RELRENT
Value: 0x000000000000002B
- Tag: DT_GNU_HASH
Value: 0x000000000000002C
- Tag: DT_TLSDESC_PLT
Value: 0x000000000000002D
- Tag: DT_TLSDESC_GOT
Value: 0x000000000000002E
- Tag: DT_RELACOUNT
Value: 0x000000000000002F
- Tag: DT_RELCOUNT
Value: 0x0000000000000030
- Tag: DT_FLAGS_1
Value: 0x0000000000000031
- Tag: DT_VERSYM
Value: 0x0000000000000032
- Tag: DT_VERDEF
Value: 0x0000000000000033
- Tag: DT_VERDEFNUM
Value: 0x0000000000000034
- Tag: DT_VERNEED
Value: 0x0000000000000035
- Tag: DT_VERNEEDNUM
Value: 0x0000000000000036
- Tag: DT_USED
Value: 0x0000000000000001
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