From: Frank Chang <frank.chang@sifive.com>

Support the true Zicclsm extension so that we can trap misaligned accesses
when Zicclsm is disabled.

To enable/disable Zicclsm, simply set zicclsm=[true|false], e.g.:
  -cpu rv64,zicclsm=[true|false]

QEMU will raise a misaligned load/store exception when executing misaligned
load/store instructions if Zicclsm is disabled.

Changelog:
  v8:
    * Squash patch#1 into patch#2.
  v7:
    * Raise the misaligned exceptions for floating-point instructions
      (RVF, RVD, Zfh) when Zicclsm is disabled.
    * Add Zicclsm unit tests.
  v6:
    * Reorder and squash Zicclsm CPU property and RVA22U64 profile patches to
      make every single commit to pass `make check`.
  v5:
    * Add Zicclsm to RVA22U64 profile explicitly.
    * Rebase to the latest riscv-to-apply.next.
  v4:
    * Align ROM reset vector data at 8-byte aligned offsets.
  v3:
    * Enable Zicclsm for the compatible CPUs.
    * Rebase to the latest riscv-to-apply.next.
  v2:
    * Use (size_memop(size) | mo_endian_env(env)) to calculate MemOp.
    * Use (log2_esz << MO_ASHIFT) to calculate aligment MemOp for
      vector load/store whole register instructions.

Frank Chang (7):
  target/riscv: Add Zicclsm CPU option and enable it for the eligible
    CPUs
  hw/riscv: sifive_u: Align ROM reset vector data
  target/riscv: Support raising misaligned exceptions for scalar
    loads/stores
  target/riscv: Support raising misaligned exceptions for floating-point
    loads/stores
  target/riscv: Support raising misaligned exceptions for vector
    loads/stores
  target/riscv: Expose Zicclsm as a CPU property and update RVA22U64
    profile
  tests/tcg/riscv64: Add test for Zicclsm

 hw/riscv/sifive_u.c                           |  11 +-
 target/riscv/cpu.c                            |  10 +-
 target/riscv/cpu_cfg_fields.h.inc             |   2 +
 target/riscv/tcg/insn_trans/trans_rvd.c.inc   |   6 +
 target/riscv/tcg/insn_trans/trans_rvf.c.inc   |   6 +
 target/riscv/tcg/insn_trans/trans_rvi.c.inc   |   6 +
 target/riscv/tcg/insn_trans/trans_rvv.c.inc   |  18 +-
 target/riscv/tcg/insn_trans/trans_rvzfh.c.inc |   6 +
 target/riscv/tcg/vector_helper.c              |  65 +++-
 tests/tcg/riscv64/Makefile.softmmu-target     |  22 ++
 tests/tcg/riscv64/test-zicclsm.S              | 368 ++++++++++++++++++
 11 files changed, 496 insertions(+), 24 deletions(-)
 create mode 100644 tests/tcg/riscv64/test-zicclsm.S

--
2.43.0

On Mon, 2026-08-10 at 13:56 +0800, frank.chang@sifive.com wrote:
> From: Frank Chang <frank.chang@sifive.com>
> 
> Support the true Zicclsm extension so that we can trap misaligned
> accesses
> when Zicclsm is disabled.
> 
> To enable/disable Zicclsm, simply set zicclsm=[true|false], e.g.:
>   -cpu rv64,zicclsm=[true|false]
> 
> QEMU will raise a misaligned load/store exception when executing
> misaligned
> load/store instructions if Zicclsm is disabled.
> 
> Changelog:
>   v8:
>     * Squash patch#1 into patch#2.
>   v7:
>     * Raise the misaligned exceptions for floating-point instructions
>       (RVF, RVD, Zfh) when Zicclsm is disabled.
>     * Add Zicclsm unit tests.
>   v6:
>     * Reorder and squash Zicclsm CPU property and RVA22U64 profile
> patches to
>       make every single commit to pass `make check`.
>   v5:
>     * Add Zicclsm to RVA22U64 profile explicitly.
>     * Rebase to the latest riscv-to-apply.next.
>   v4:
>     * Align ROM reset vector data at 8-byte aligned offsets.
>   v3:
>     * Enable Zicclsm for the compatible CPUs.
>     * Rebase to the latest riscv-to-apply.next.
>   v2:
>     * Use (size_memop(size) | mo_endian_env(env)) to calculate MemOp.
>     * Use (log2_esz << MO_ASHIFT) to calculate aligment MemOp for
>       vector load/store whole register instructions.
> 
> Frank Chang (7):
>   target/riscv: Add Zicclsm CPU option and enable it for the eligible
>     CPUs
>   hw/riscv: sifive_u: Align ROM reset vector data
>   target/riscv: Support raising misaligned exceptions for scalar
>     loads/stores
>   target/riscv: Support raising misaligned exceptions for floating-
> point
>     loads/stores
>   target/riscv: Support raising misaligned exceptions for vector
>     loads/stores
>   target/riscv: Expose Zicclsm as a CPU property and update RVA22U64
>     profile
>   tests/tcg/riscv64: Add test for Zicclsm

Thanks!

Applied to riscv-to-apply.next

Alistair

> 
>  hw/riscv/sifive_u.c                           |  11 +-
>  target/riscv/cpu.c                            |  10 +-
>  target/riscv/cpu_cfg_fields.h.inc             |   2 +
>  target/riscv/tcg/insn_trans/trans_rvd.c.inc   |   6 +
>  target/riscv/tcg/insn_trans/trans_rvf.c.inc   |   6 +
>  target/riscv/tcg/insn_trans/trans_rvi.c.inc   |   6 +
>  target/riscv/tcg/insn_trans/trans_rvv.c.inc   |  18 +-
>  target/riscv/tcg/insn_trans/trans_rvzfh.c.inc |   6 +
>  target/riscv/tcg/vector_helper.c              |  65 +++-
>  tests/tcg/riscv64/Makefile.softmmu-target     |  22 ++
>  tests/tcg/riscv64/test-zicclsm.S              | 368
> ++++++++++++++++++
>  11 files changed, 496 insertions(+), 24 deletions(-)
>  create mode 100644 tests/tcg/riscv64/test-zicclsm.S
> 
> --
> 2.43.0
>