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Fangrui Song ec575e3b0a [sanitizer] Simplify GetTls with dl_iterate_phdr on Linux 
This was reverted by f176803ef1 due to
Ubuntu 16.04 x86-64 glibc 2.23 problems.
This commit additionally calls `__tls_get_addr({modid,0})` to work around the
dlpi_tls_data==NULL issues for glibc<2.25
(https://sourceware.org/bugzilla/show_bug.cgi?id=19826)

GetTls is the range of

* thread control block and optional TLS_PRE_TCB_SIZE
* static TLS blocks plus static TLS surplus

On glibc, lsan requires the range to include
`pthread::{specific_1stblock,specific}` so that allocations only referenced by
`pthread_setspecific` can be scanned.

This patch uses `dl_iterate_phdr` to collect TLS blocks. Find the one
with `dlpi_tls_modid==1` as one of the initially loaded module, then find
consecutive ranges. The boundaries give us addr and size.

This allows us to drop the glibc internal `_dl_get_tls_static_info` and
`InitTlsSize` entirely. Use the simplified method with non-Android Linux for
now, but in theory this can be used with *BSD and potentially other ELF OSes.

This simplification enables D99566 for TLS Variant I architectures.

See https://reviews.llvm.org/D93972#2480556 for analysis on GetTls usage
across various sanitizers.

Differential Revision: https://reviews.llvm.org/D98926
 		2021-04-04 15:35:53 -07:00
..
cmake [builtins] Build for arm64_32 for watchOS (Darwin) 2021-04-01 17:16:18 -07:00
docs
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include [TSan] Support initialize/finalize hooks in dynamic libraries 2021-03-24 12:38:39 -07:00
lib [sanitizer] Simplify GetTls with dl_iterate_phdr on Linux 2021-04-04 15:35:53 -07:00
test [sanitizer] Simplify GetTls with dl_iterate_phdr on Linux 2021-04-04 15:35:53 -07:00
tools [GWP-ASan] Add inbuilt options parser. 2021-01-15 12:57:05 -08:00
unittests [Scudo] [GWP-ASan] Add GWP-ASan to Scudo Standalone. 2019-12-13 09:09:41 -08:00
utils [compiler-rt] [netbsd] Update generate_netbsd_syscalls.awk 2020-09-10 20:16:17 +02:00
www [Branch-Rename] Fix some links 2021-02-01 16:43:21 +05:30
.clang-tidy [NFC][compiler-rt] Refine .clang-tidy checks 2020-09-05 15:42:15 -07:00
.gitignore
…
CMakeLists.txt [CMake] Rename RUNTIMES_BUILD to LLVM_RUNTIMES_BUILD 2021-03-03 10:58:51 -08:00
CODE_OWNERS.TXT
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CREDITS.TXT
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LICENSE.TXT
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README.txt
…

README.txt 

Compiler-RT
================================

This directory and its subdirectories contain source code for the compiler
support routines.

Compiler-RT is open source software. You may freely distribute it under the
terms of the license agreement found in LICENSE.txt.

================================