tree 3f03a3b199757a0dbec49b4067d7b74f7d102619
parent f59d6500cf0ba65bd8460e0d7c01fef085d32387
author Fangrui Song <maskray@google.com> 1566290096 +0000
committer Fangrui Song <maskray@google.com> 1566290096 +0000

[ELF][AArch64] Allow PT_LOAD to have overlapping p_offset ranges

Ported the D64906 technique to AArch64. It deletes 3 alignments at
PT_LOAD boundaries for the default case: the size of an aarch64 binary
decreases by at most 192kb.

If `sh_addralign(.tdata) < sh_addralign(.tbss)`,
we can potentially make `p_vaddr(PT_TLS)%p_align(PT_TLS) != 0`.

ld.so that are known to have problems if p_vaddr%p_align!=0:

* musl<=1.1.22
* FreeBSD 13.0-CURRENT (and before) rtld-elf arm64

New test aarch64-tls-vaddr-align.s checks that our workaround makes p_vaddr%p_align = 0.

Reviewed By: ruiu

Differential Revision: https://reviews.llvm.org/D64930

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@369344 91177308-0d34-0410-b5e6-96231b3b80d8