Commit Graph

10 Commits

Author SHA1 Message Date
Fangrui Song 7c0881a38f [ELF] --gc-sections: Change startwith(".jcr") to exact match
GNU ld's internal linker script keeps `.jcr`, but not other sections
starting with `.jcr`.
2021-12-15 01:27:08 -08:00
Fangrui Song 21dbfd4300 [ELF] --gc-sections: Change startwith(".init") (and ".fini") to exact match
GNU ld's internal linker script keeps `.init`, but not other sections starting
with `.init`. .fini is similar.
2021-12-15 01:16:26 -08:00
Andrew Ng d4e2e2852a [ELF][test] Add test coverage of TLS to gc-sections.s
Differential Revision: https://reviews.llvm.org/D86639
2020-08-27 12:28:51 +01:00
Fangrui Song b159906a9a [test] Change llvm-readobj -long-option to --long-option or well-known short options. NFC
Also change some options that have different semantics (cause confusion) in llvm-readelf mode:

-s => -S
-t => --symbols
-sd => --section-data

llvm-svn: 359651
2019-05-01 05:49:01 +00:00
Rafael Espindola d23e9267a6 Order writable executable sections before writable ones.
On SPARC, .plt is both writeable and executable. The current way
sections are sorted means that lld puts it after .data/.bss. but it
really needs to be close to .test to make sure branches into .plt
don't overflow. I'd argue that because .bss is supposed to come last
on all architectures, we should change the default sort order such
that writable and executable sections come before sections that are
just writeable. read-only executable sections should still come after
sections that are just read-only of course. This diff makes this
change.

llvm-svn: 304008
2017-05-26 17:23:25 +00:00
Peter Collingbourne 0fab40b915 ELF: Simplify handling of *_start/*_end symbols.
We were previously using the (static) addSynthetic function to create
*_start/*_end symbols. This function was doing almost the same thing as
addOptionalSynthetic, except that it would also create the symbol in the
case where it is unreferenced. Because the symbol has hidden visibility,
creating it in that case would have no effect other than adding another
entry to the static symbol table. Remove addSynthetic and change callers to
use addOptionalSynthetic instead.

Differential Revision: https://reviews.llvm.org/D25545

llvm-svn: 285021
2016-10-24 20:46:21 +00:00
Eugene Leviant 8287b1bce1 Linkerscript: do not GC non-allocated sections
Differential revision: https://reviews.llvm.org/D24733

llvm-svn: 282391
2016-09-26 08:32:41 +00:00
Davide Italiano bcbfedc927 [ELF] Don't reclaim .ctors/.dtors sections.
In FreeBSD, rtld expects .ctors containing -1 (0xffffffff), and a
.ctors section containing the correct bits is provided to the linker as
input (/usr/lib/crtbegin.o).

Contents of section .ctors:
 0000 ffffffff ffffffff                    ........

This section is not stripped even if not referenced or empty, also in
gold or ld.bfd. It would be nice to strip it when not needed but
since existing object files rely on that we can't do better to keep it
around.

Differential Revision:   http://reviews.llvm.org/D15767

llvm-svn: 256373
2015-12-24 09:52:11 +00:00
Rafael Espindola 9c8904fb38 Rename ld.lld2 to ld.lld since it is the default.
llvm-svn: 253437
2015-11-18 06:11:01 +00:00
Rafael Espindola 4b1285c55a Rename test/elf2 to test/ELF.
llvm-svn: 253313
2015-11-17 05:36:42 +00:00