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LibELF+LibC: Add support for Variant I of the TLS data structures

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We currently only supported Variant II which is used by x86-64.
Variant I is used by both AArch64 (when using the traditional
non-TLSDESC model) and RISC-V, although with small differences.

The TLS layout for Variant I is essentially flipped. The static TLS
blocks are after the thread pointer for Variant I, while on Variant II
they are before it.

Some code using ELF TLS already worked on AArch64 and RISC-V even though
we only support Variant II. This is because only the local-exec model
directly uses TLS offsets, other models use relocations or
__tls_get_addr().
This commit is contained in:
Sönke Holz 2024-04-17 21:38:49 +02:00 • committed by Andrew Kaster
commit 9437b29b43
Notes: sideshowbarker 2024-07-17 02:39:10 +09:00
4 changed files with 67 additions and 30 deletions
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3
Userland/Libraries/LibC/tls.cpp
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@ -5,6 +5,7 @@
*/
#include <AK/Types.h>
#include <LibELF/Arch/tls.h>
#include <sys/internals.h>
extern "C" {
@ -21,6 +22,6 @@ extern "C" {
// changed if we support dynamically allocated TLS blocks.
void* __tls_get_addr(__tls_index* index)
{
return reinterpret_cast<void*>(reinterpret_cast<FlatPtr>(__builtin_thread_pointer()) + index->ti_module + index->ti_offset);
return reinterpret_cast<void*>(reinterpret_cast<FlatPtr>(__builtin_thread_pointer()) + index->ti_module + index->ti_offset + ELF::TLS_DTV_OFFSET);
}
}