[PATCH v2 0/3] Small step in supporting AVX instructions

[Guinevere Larsen <blarsen@redhat.com>]

This patch series is the first, very small, step in supporting AVX and
AVX2 instructions for the record-full target. It is important that we
support it since glibc has been using avx instructions for a long time
(at least fedora 21), so depending on which functions an inferior uses,
they might be very inconvenienced.

Patch 1 adds capability to identify the VEX prefix, but no instruction
support. Patches 2 and 3 add support for a total of 10 instructions,
which covers around 5% of all AVX instructions used by system libraries
in my fedora 39 box.

While this support is extremely minimal, I figured I could propose the
patch series early so it was open for others with more free time could
help contributing to this :)

---
Changes for v2:
* stopped using "error" when finding incorrect encoding in vmov
  instructions, as suggested by Tom Tromey.
* Changed i386-avx-reverse test, to stop failing with clang.
* Changed the KFAIL in gdb.reverse/step-precsave, so we don't get new
  FAILs while AVX support is incomplete.

Guinevere Larsen (3):
  gdb: Start supporting AVX instruction
  gdb/record: add support to vmovd and vmovq instructions
  gdb/record: add support to AVX unpack instructions

 gdb/amd64-tdep.c                              |   3 +-
 gdb/i386-tdep.c                               | 173 ++++++++++++++-
 gdb/i386-tdep.h                               |   2 +
 gdb/testsuite/gdb.reverse/i386-avx-reverse.c  | 138 ++++++++++++
 .../gdb.reverse/i386-avx-reverse.exp          | 203 ++++++++++++++++++
 gdb/testsuite/gdb.reverse/step-precsave.exp   |   4 +-
 6 files changed, 518 insertions(+), 5 deletions(-)
 create mode 100644 gdb/testsuite/gdb.reverse/i386-avx-reverse.c
 create mode 100644 gdb/testsuite/gdb.reverse/i386-avx-reverse.exp

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2.45.1