[PATCH v5 0/3] RISC-V: Implement TLS Descriptors.

[Tatsuyuki Ishi <ishitatsuyuki@gmail.com>]

This patchset implements TLS Descriptors (TLSDESC) for RISC-V targets, per
the ratified specification at [1].

Partial support for TLSDESC is in binutils trunk. In [2] there is
additional support for relaxation which is required to pass
tst-tls1-static. GCC needs to be patched with [3].

Passes binutils and gcc tests for rv32gcv and rv64gcv. For glibc I only
tested elf/ as other subsystems sometimes doesn't work well under qemu.

This contribution is made on behalf of Blue Whale Systems, which has
copyright assignment on file with the FSF.

v2: Fix end-of-file newlines.
v3: Fix segfaulting on the slow path of TLSDESC resolver.
    Fix handling of lazy relocations.
v4: Fix compiler warnings.
    Fix fast path stack alignment pointed out by Andrew.
    Fix style issues pointed out by Adhemerval.
    Include 2 missing prerequisite commits.
    Update localplt list.
v5: Add stubs for save/restore of vector registers.
    Add comments and reordered sections for readability in the TLSDESC assembly.
    Add clobber test sequence for tst-gnu2-tls2.

[1]: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/373
[2]: https://inbox.sourceware.org/binutils/20240220175556.304692-1-ishitatsuyuki@gmail.com/
[3]: https://inbox.sourceware.org/gcc-patches/20240329055239.29719-1-ishitatsuyuki@gmail.com/

Tatsuyuki Ishi (3):
  RISC-V: Add include guard for dl-tls.h.
  RISC-V: Add TLSDESC reloc definitions.
  RISC-V: Implement TLS Descriptors.

 elf/elf.h                                   |   5 +
 sysdeps/riscv/Makefile                      |  10 +
 sysdeps/riscv/dl-lookupcfg.h                |  27 ++
 sysdeps/riscv/dl-machine.h                  |  50 +++-
 sysdeps/riscv/dl-tls.h                      |   4 +
 sysdeps/riscv/dl-tlsdesc.S                  | 269 ++++++++++++++++++++
 sysdeps/riscv/dl-tlsdesc.h                  |  48 ++++
 sysdeps/riscv/linkmap.h                     |   1 +
 sysdeps/riscv/preconfigure                  |   1 +
 sysdeps/riscv/tlsdesc.c                     |  38 +++
 sysdeps/riscv/tlsdesc.sym                   |  19 ++
 sysdeps/riscv/tst-gnu2-tls2.c               |  33 +++
 sysdeps/unix/sysv/linux/riscv/localplt.data |   2 +
 13 files changed, 506 insertions(+), 1 deletion(-)
 create mode 100644 sysdeps/riscv/dl-lookupcfg.h
 create mode 100644 sysdeps/riscv/dl-tlsdesc.S
 create mode 100644 sysdeps/riscv/dl-tlsdesc.h
 create mode 100644 sysdeps/riscv/tlsdesc.c
 create mode 100644 sysdeps/riscv/tlsdesc.sym
 create mode 100644 sysdeps/riscv/tst-gnu2-tls2.c

-- 
2.44.0