This patchset implements RISC-V Zc* extension v1.0.0.RC5.7 version instructions.

Specification:
https://github.com/riscv/riscv-code-size-reduction/tree/main/Zc-specification

The port is available here:
https://github.com/plctlab/plct-qemu/tree/plct-zce-upstream-v6

To test Zc* implementation, specify cpu argument with 'x-zca=true,x-zcb=true,x-zcf=true,f=true" and "x-zcd=true,d=true" (or "x-zcmp=true,x-zcmt=true" with c or d=false) to enable Zca/Zcb/Zcf and Zcd(or Zcmp,Zcmt) extension support.


This implementation can pass the basic zc tests from https://github.com/yulong-plct/zc-test

v6：
* fix base address for jump table in Patch 7
* rebase on riscv-to-apply.next

v5:
* fix exception unwind problem for cpu_ld*_code in helper of cm_jalt

v4:
* improve Zcmp suggested by Richard
* fix stateen related check for Zcmt

v3:
* update the solution for Zcf to the way of Zcd
* update Zcb to reuse gen_load/store
* use trans function instead of helper for push/pop

v2:
* add check for relationship between Zca/Zcf/Zcd with C/F/D based on related discussion in review of Zc* spec
* separate c.fld{sp}/fsd{sp} with fld{sp}/fsd{sp} before support of zcmp/zcmt

Weiwei Li (9):
  target/riscv: add cfg properties for Zc* extension
  target/riscv: add support for Zca extension
  target/riscv: add support for Zcf extension
  target/riscv: add support for Zcd extension
  target/riscv: add support for Zcb extension
  target/riscv: add support for Zcmp extension
  target/riscv: add support for Zcmt extension
  target/riscv: expose properties for Zc* extension
  disas/riscv.c: add disasm support for Zc*

 disas/riscv.c                             | 287 +++++++++++++++++++-
 target/riscv/cpu.c                        |  56 ++++
 target/riscv/cpu.h                        |  10 +
 target/riscv/cpu_bits.h                   |   7 +
 target/riscv/csr.c                        |  38 ++-
 target/riscv/helper.h                     |   3 +
 target/riscv/insn16.decode                |  63 ++++-
 target/riscv/insn_trans/trans_rvd.c.inc   |  18 ++
 target/riscv/insn_trans/trans_rvf.c.inc   |  18 ++
 target/riscv/insn_trans/trans_rvi.c.inc   |   4 +-
 target/riscv/insn_trans/trans_rvzce.c.inc | 313 ++++++++++++++++++++++
 target/riscv/machine.c                    |  19 ++
 target/riscv/meson.build                  |   3 +-
 target/riscv/translate.c                  |  15 +-
 target/riscv/zce_helper.c                 |  55 ++++
 15 files changed, 893 insertions(+), 16 deletions(-)
 create mode 100644 target/riscv/insn_trans/trans_rvzce.c.inc
 create mode 100644 target/riscv/zce_helper.c

-- 
2.25.1