Commit Graph

7 Commits

Author SHA1 Message Date
Fangrui Song 00c76f3496 [ELF][test] Improve arm-exidx-output.s to test different output text sections
Delete arm-exidx-link.s which is now covered by arm-exidx-output.s

Differential Revision: https://reviews.llvm.org/D76409
2020-03-29 13:12:20 -07:00
Fangrui Song 5d4bc1293c [ARM][test] Improve tests
Delete trailing 2>&1 that is not piped to another command.
Add --no-show-raw-insn to objdump -d commands.

llvm-svn: 366676
2019-07-22 11:37:03 +00:00
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
Fangrui Song b6772b86e2 [ELF] Move `// REQUIRES:` line to the top
llvm-svn: 335676
2018-06-26 22:20:04 +00:00
Rafael Espindola 933fcab2ad Always compute sh_link for SHF_LINK_ORDER sections.
Since the output has a section table too, it is meaningful to compute
the sh_link. In a more practical note, the binutils' strip crashes if
sh_link is not set for SHT_ARM_EXIDX.

llvm-svn: 287280
2016-11-17 23:16:39 +00:00
Peter Smith 0a259f3b9c [ELF][ARM] Initial implentation of ARM exceptions support
The .ARM.exidx sections contain a table. Each entry has two fields:
- PREL31 offset to the function the table entry describes
- Action to take, either cantunwind, inline unwind, or PREL31 offset to
  .ARM.extab section

The table entries must be sorted in order of the virtual addresses the
first entry of the table describes. Traditionally this is implemented by
the SHF_LINK_ORDER dependency. Instead of implementing this directly we
sort the table entries post relocation. 

The .ARM.exidx OutputSection is described by the PT_ARM_EXIDX program
header

Differential revision: https://reviews.llvm.org/D25127

llvm-svn: 283730
2016-10-10 09:39:26 +00:00
Peter Smith a52864a78c Canonicalize output section name for .ARM.exidx sections
The ARM Exception handling ABI requires that all ARM exception index
table sections have a prefix of .ARM.exidx and are combined into a
single contiguous block either in their own output section or as part
of another output section.
    
In general clang will output a single .ARM.exidx section per object,
but will use .ARM.exidx.<section name> when -ffunction-sections is used.
    
This change canonicalizes the names of sections with the .ARM.exidx
prefix to just .ARM.exidx, which ensures that there is only a single
output section.

Differential Revision: https://reviews.llvm.org/D23775

llvm-svn: 279617
2016-08-24 09:08:54 +00:00