[Qemu-devel] [PATCH 00/11] target/arm: Implement ARMv8.5-BTI

[Richard Henderson]

The branch target identification extension does not yet have
kernel or gcc support.  It should be in shape for developing
those though.

In system mode I do honor the GP bit from the page tables.
In user-only mode, there is a way to pretend that the GP bit
is always set.  Further linux-user changes will have to track
the ABI that gets developed.

In the meantime, provide a statically linable make check-tcg 
test for the functionality.


r~


Richard Henderson (11):
  target/arm: Introduce isar_feature_aa64_bti
  target/arm: Add PSTATE.BTYPE
  target/arm: Add BT and BTYPE to tb->flags
  target/arm: Record the GP bit for a page in MemTxAttrs
  target/arm: Default handling of BTYPE during translation
  target/arm: Reset btype for direct branches and syscalls
  target/arm: Set btype for indirect branches
  target/arm: Add guarded_pages cpu property for user-only
  target/arm: Enable BTI for -cpu max
  linux-user/aarch64: Reset btype for signal handlers
  tests/tcg/aarch64: Add bti smoke test

 include/exec/memattrs.h           |   2 +
 target/arm/cpu.h                  |  22 +++-
 target/arm/internals.h            |   6 +
 target/arm/translate.h            |   9 ++
 linux-user/aarch64/signal.c       |   4 +
 target/arm/cpu64.c                |  22 ++++
 target/arm/helper.c               |  28 +++--
 target/arm/translate-a64.c        | 196 +++++++++++++++++++++++++++++-
 tests/tcg/aarch64/bti-1.c         |  61 ++++++++++
 tests/tcg/aarch64/bti-crt.inc.c   |  51 ++++++++
 tests/tcg/aarch64/Makefile.target |   7 +-
 11 files changed, 397 insertions(+), 11 deletions(-)
 create mode 100644 tests/tcg/aarch64/bti-1.c
 create mode 100644 tests/tcg/aarch64/bti-crt.inc.c

-- 
2.17.2