Xing GUO 91f02ebcd5 [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; } } ``` 80192cd83b/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 llvm-svn: 355468		2019-03-06 01:28:40 +00:00
..
Inputs	[obj2yaml] - Do not miss section index for special symbols.	2019-02-22 08:45:21 +00:00
dynamic-section-arch-tags.test	[yaml2obj][obj2yaml] - Add support for the architecture specific dynamic tags.	2019-02-26 14:14:49 +00:00
dynamic-section.test	[BinaryFormat] Add DT_USED tag into dynamic section.	2019-03-06 01:28:40 +00:00
elf-entsize.yaml
elf-shinfo.yaml	[yaml2obj] - Allow setting custom sh_info for RawContentSection sections.	2019-03-01 10:18:16 +00:00
invalid_input_file.test
lit.local.cfg	[obj2yaml][yaml2obj]Locate all .yaml and .test tests	2019-02-20 15:13:44 +00:00
missing_symtab.test
section-type.yaml	[yaml2obj][obj2yaml] Remove section type range markers from allowed mappings and support hex values	2019-02-19 16:22:21 +00:00
special-symbol-indices.yaml	[obj2yaml] - Do not miss section index for special symbols.	2019-02-22 08:45:21 +00:00
symbol-type.yaml
verdef-section.yaml	[yaml2obj][obj2yaml] - Support SHT_GNU_verdef (.gnu.version_d) section.	2019-02-21 12:21:43 +00:00
verneed-section.yaml	Recommit r354328, r354329 "[obj2yaml][yaml2obj] - Add support of parsing/dumping of the .gnu.version_r section."	2019-02-19 14:53:48 +00:00
versym-section.yaml	[yaml2obj][obj2yaml] - Support SHT_GNU_versym (.gnu.version) section.	2019-02-19 15:29:07 +00:00