[PATCH v5 0/6] Pointer Masking update for Zjpm v0.8

[Alexey Baturo]

From: Alexey Baturo <baturo.alexey@gmail.com>

Hi,

This patch series targets Zjpm v0.8 extension.
The spec itself could be found here: 
https://github.com/riscv/riscv-j-extension/blob/8088461d8d66a7676872b61c908cbeb7cf5c5d1d/zjpm-spec.pdf
This patch series is updated after the suggested comments:
- add "x-" to the extension names to indicate experimental

[v4]:
Patch series updated after the suggested comments:
- removed J-letter extension as it's unused
- renamed and fixed function to detect if address should be sign-extended
- zeroed unused context variables and moved computation logic to another patch
- bumped pointer masking version_id and minimum_version_id by 1

Thanks

[v3]:
There patches are updated after Richard's comments:
- moved new tb flags to the end
- used tcg_gen_(s)extract to get the final address
- properly handle CONFIG_USER_ONLY

Thanks

[v2]:
As per Richard's suggestion I made pmm field part of tb_flags.
It allowed to get rid of global variable to store pmlen.
Also it allowed to simplify all the machinery around it.

Thanks

[v1]:
Hi all,

It looks like Zjpm v0.8 is almost frozen and we don't expect it change 
drastically anymore.
Compared to the original implementation with explicit base and mask CSRs, we 
now only have
several fixed options for number of masked bits which are set using existing 
CSRs.
The changes have been tested with handwritten assembly tests and LLVM HWASAN
test suite.

Thanks

Alexey Baturo (6):
  target/riscv: Remove obsolete pointer masking extension code.
  target/riscv: Add new CSR fields for S{sn,mn,m}pm extensions as part
    of Zjpm v0.8
  target/riscv: Add helper functions to calculate current number of
    masked bits for pointer masking
  target/riscv: Add pointer masking tb flags
  target/riscv: Update address modify functions to take into account
    pointer masking
  target/riscv: Enable updates for pointer masking variables and thus
    enable pointer masking extension

 target/riscv/cpu.c           |  22 ++-
 target/riscv/cpu.h           |  46 +++--
 target/riscv/cpu_bits.h      |  90 +---------
 target/riscv/cpu_cfg.h       |   3 +
 target/riscv/cpu_helper.c    |  97 +++++-----
 target/riscv/csr.c           | 337 ++---------------------------------
 target/riscv/machine.c       |  20 +--
 target/riscv/pmp.c           |  13 +-
 target/riscv/pmp.h           |  11 +-
 target/riscv/tcg/tcg-cpu.c   |   5 +-
 target/riscv/translate.c     |  46 ++---
 target/riscv/vector_helper.c |  15 +-
 12 files changed, 158 insertions(+), 547 deletions(-)

-- 
2.34.1