Commit Graph

10 Commits

Author SHA1 Message Date
Fangrui Song 024bf27ddf [ELF][ARM] Allow PT_LOAD to have overlapping p_offset ranges on EM_ARM
Port the D64906 technique to ARM. It deletes 3 alignments at
PT_LOAD boundaries for the default case: the size of an arm binary
decreases by at most 12kb.

Reviewed By: grimar

Differential Revision: https://reviews.llvm.org/D66749

llvm-svn: 370049
2019-08-27 11:52:36 +00:00
Fangrui Song fdbc2bd2aa [ELF][ARM] Add --no-show-raw-insn and -soname to some ARM tests
Delete some insignificant addresses to make it simpler for layout
changes.

llvm-svn: 370048
2019-08-27 11:50:27 +00:00
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 3d87323a7e [ELF] Make non-writable non-executable PROGBITS sections closer to .text
This generalizes the old heuristic placing SHT_DYNSYM SHT_DYNSTR first in the readonly SHF_ALLOC segment.

Reviewers: espindola

Subscribers: emaste, arichardson, llvm-commits

Differential Revision: https://reviews.llvm.org/D48406

llvm-svn: 335674
2018-06-26 22:13:32 +00:00
Han Shen b56030ee9e [lld] Mitigate relocation overflow [part 1 of 2].
This CL places .dynsym and .dynstr at the beginning of SHF_ALLOC
sections. We do this to mitigate the possibility that huge .dynsym and
.dynstr sections placed between ro-data and text sections cause
relocation overflow.

Differential Revision: https://reviews.llvm.org/D45788

llvm-svn: 332374
2018-05-15 17:02:35 +00:00
George Rimar 4c9ae67bb7 [ELF] - Revert of: r332038, r332054, r332060, r332061, r332062, r332063
This reverts "Mitigate relocation overflow [part 1 of 2]." and the following commits which
were trying to fix the bots.

At the moment of r332082, bots are still failing and we need to find the reason of test case breakages first of all.
http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-windows10pro-fast/builds/17042/steps/test/logs/stdio
http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-ubuntu-fast/builds/29845/steps/test/logs/stdio

llvm-svn: 332085
2018-05-11 08:11:25 +00:00
Han Shen 6c0881c3cd Mitigate relocation overflow [part 1 of 2].
This CL is to mitigate R_X86_64_PC32 relocation overflow problems for huge binaries that has near 4G allocated sections.

By examining those binaries, there're 2 issues contributes to the problem:
1). huge ".dynsym" and ".dynstr" stands in the way between .rodata and .text
2). _init_array_start/end are placed at 0 if no ".init_array" presents, this causes .text relocation against them become more prone to overflow.

This CL addresses 1st problem (the 2nd will be addressed in another CL.) by assigning a smaller sortrank to .dynsym and .dynstr thus they no longer stand in between.

llvm-svn: 332038
2018-05-10 20:44:42 +00:00
George Rimar 2ab9362bf5 [ELF] - Never create .gnu_hash with NBuckets == 0.
Currently, we can end up with NBuckets==0 and android loader
does not like it (PR36537).

Seems we can go with a minimal amount of changes here for simplicity
and be consistent with gold and so just always use >= 1 value for NBuckets.

Differential revision: https://reviews.llvm.org/D44422

llvm-svn: 327481
2018-03-14 08:52:39 +00:00
Rafael Espindola 893c13e58e Add missing REQUIRES.
llvm-svn: 326210
2018-02-27 17:13:23 +00:00
Rafael Espindola 3bfa8f0120 Add support for SHF_ARM_PURECODE.
Now we don't mark a PT_LOAD as readable if all its sections are
SHF_ARM_PURECODE.

llvm-svn: 326207
2018-02-27 16:55:25 +00:00