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[Qemu-devel] [RISU RFC PATCH v1 0/7] Support for generating x86 SSE/SSE2

From: Jan Bobek
Subject: [Qemu-devel] [RISU RFC PATCH v1 0/7] Support for generating x86 SSE/SSE2 test images
Date: Wed, 19 Jun 2019 01:04:40 -0400

Hi all,

this is v1 of my changes to risugen in order to support generating x86
test images. It's still work-in-progress (thus marked RFC; notably,
there is no support for AVX yet), but I would like to get this out
there to get some early feedback on my approach.

Initially, I thought adding support for arbitrarily-long instructions
would be more or less enough for x86, but unfortunately this turned
out not to be the case; the length variation introduced by ModR/M, SIB
and displacement fields would force us to have to have at least 6
config file entries per almost every instruction, which is pretty much
unmaintainable. Instead, I drew inspiration from the "memory" blocks
in arm.risu for specifying memory constraints, and introduced "emit"
blocks for x86. Example x86 config file with SSE and SSE2 instructions
can be found in the last two commits, let me know what you think.

There are still some limitations -- besides missing (E)VEX support,
some forms of ModR/M are also not supported (mostly because it's hard
or impossible to figure out and use the correct memory address), and
the LDMXCSR instruction is currently commented out because there's no
way to specify constraints on memory contents. However, this patch
series should have enough code to demonstrate my intended general
approach, and that's what I am looking for feedback for.


Jan Bobek (7):
  risugen_common: add insnv, randint_constr, rand_fill
  risugen_x86_asm: add module
  risugen_x86_emit: add module
  risugen_x86: add module
  risugen: allow all byte-aligned instructions
  x86.risu: add SSE instructions
  x86.risu: add SSE2 instructions

 risugen             |  15 +-
 risugen_common.pm   | 101 +++++++++-
 risugen_x86.pm      | 455 ++++++++++++++++++++++++++++++++++++++++++++
 risugen_x86_asm.pm  | 186 ++++++++++++++++++
 risugen_x86_emit.pm |  85 +++++++++
 x86.risu            | 245 ++++++++++++++++++++++++
 6 files changed, 1075 insertions(+), 12 deletions(-)
 create mode 100644 risugen_x86.pm
 create mode 100644 risugen_x86_asm.pm
 create mode 100644 risugen_x86_emit.pm
 create mode 100644 x86.risu


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