[PATCH 0/3] aarch64: enable PAC and BTI

[Bill Roberts]

See Commit Message for More Details

- V7:
  - Drop GMP_GET_MACRO_VALUE
  - Drop GMP_CHECK_PROG
  - configure.ac already uses sed and grep, hardcoded, so add checks for them
    and use the variables over the direct command
  - Bolster documentation with links to the Arm ARM, ABI and Blog documentations
    - Make some clarifications in the commit message as well
  - Add NONLEAF_PROLOGUE instead of calling PROLOGUE(xxx, true)
    - naming convention follows MULFUNC_PROLOGUE naming convention
    - Update the pattern matching for determining if generic C or asm should be used
    - Requires EGREP for automatic configuration of assembly routines over generic
      C implementations
  - Add License to t-arm64_elf_check.sh
  - Detect sed and grep using autoconf and use the proper SED and GREP variables
    respectively to invoke them vs hardcoding it
  - Drop erroneous Makefile.am formatting change

- V6:
  - Fix commit message wording
  - Fix double use of sign in commit message when verify was intended
  - Drop spurious whitespace only change in configure.ac
  - comment in tests/mpn/t-arm64_bti.c why we return 0 if the symbol is not found
  - Fix table whitespace in tests/mpn/t-arm64_bti.c
  - Use declare -g over eval in tests/mpn/t-arm64_elf_check.sh
  - Quote rc calculation and exit in tests/mpn/t-arm64_elf_check.sh
  - Fix typo in tests/mpn/t-arm64_elf_check.sh "binary ast he ONLY" -> "binary as the ONLY"
 
- V5:
  - Fix cross compilation support
- V4:
  - Fix typos in bash script comments
- V3:
  - Use divert(1) to add GNU Notes to ELF files to avoid
    needing the macro in each file.
- V2:
  - Add tests
- V1:
  - Initial Commit

Bill Roberts (3):
  configure: use AC_PROG_GREP to detect a suitable grep
  configure: use AC_PROG_SED to detect a suitable sed
  aarch64: Support PAC and BTI

 configure.ac                   | 136 ++++++++++++++++++++++------
 mpn/arm64/arm64-defs.m4        | 133 ++++++++++++++++++++++++++-
 mpn/arm64/divrem_1.asm         |   8 +-
 tests/mpn/Makefile.am          |  22 ++++-
 tests/mpn/t-arm64_bti.c        |  91 +++++++++++++++++++
 tests/mpn/t-arm64_elf_check.sh | 161 +++++++++++++++++++++++++++++++++
 6 files changed, 518 insertions(+), 33 deletions(-)
 create mode 100644 tests/mpn/t-arm64_bti.c
 create mode 100755 tests/mpn/t-arm64_elf_check.sh

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2.51.0