[all-commits] [llvm/llvm-project] c6561c: [PowerPC][LLD] Support for PC Relative TLS for Loc...

[stefanp-ibm via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: c6561ccfd982f03fc9f572c6c27ddab336158e18
      https://github.com/llvm/llvm-project/commit/c6561ccfd982f03fc9f572c6c27ddab336158e18
  Author: Stefan Pintilie <stefanp at ca.ibm.com>
  Date:   2020-10-23 (Fri, 23 Oct 2020)

  Changed paths:
    M lld/ELF/Arch/PPC64.cpp
    M lld/ELF/Relocations.cpp
    A lld/test/ELF/ppc64-tls-pcrel-ld.s

  Log Message:
  -----------
  [PowerPC][LLD] Support for PC Relative TLS for Local Dynamic

Add support to LLD for PC Relative Thread Local Storage for Local Dynamic.
This patch adds support for two relocations: R_PPC64_GOT_TLSLD_PCREL34 and
R_PPC64_DTPREL34.

The Local Dynamic code is:
```
pla r3, x at got@tlsld at pcrel        R_PPC64_GOT_TLSLD_PCREL34
bl __tls_get_addr at notoc(x at tlsld) R_PPC64_TLSLD
                                 R_PPC64_REL24_NOTOC
...
paddi r9, r3, x at dtprel           R_PPC64_DTPREL34
```

After relaxation to Local Exec:
```
paddi r3, r13, 0x1000
nop
...
paddi r9, r3, x at dtprel          R_PPC64_DTPREL34
```

Reviewed By: NeHuang, sfertile

Differential Revision: https://reviews.llvm.org/D87504