On Tue, Mar 10, 2026 at 10:08 PM Brian Cain <[email protected]>
wrote:

> From: Brian Cain <[email protected]>
>
> Signed-off-by: Brian Cain <[email protected]>
> ---
>  target/hexagon/op_helper.c | 51 ++++++++++++++++++++++++++++++++++++--
>  1 file changed, 49 insertions(+), 2 deletions(-)
>
> diff --git a/target/hexagon/op_helper.c b/target/hexagon/op_helper.c
> index 161c7eaf31f..6dfc1269809 100644
> --- a/target/hexagon/op_helper.c
> +++ b/target/hexagon/op_helper.c
> @@ -1484,9 +1484,56 @@ void HELPER(stop)(CPUHexagonState *env)
>      hexagon_stop_thread(env);
>  }
>
> -void HELPER(wait)(CPUHexagonState *env, target_ulong PC)
> +static void set_wait_mode(CPUHexagonState *env)
>  {
> -    g_assert_not_reached();
> +    g_assert(bql_locked());
> +
> +    HexagonCPU *cpu = env_archcpu(env);
> +    const uint32_t modectl = cpu->globalregs ?
> +        hexagon_globalreg_read(cpu->globalregs, HEX_SREG_MODECTL,
> +                               env->threadId) : 0;
> +    uint32_t thread_wait_mask = GET_FIELD(MODECTL_W, modectl);
> +    thread_wait_mask |= 0x1 << env->threadId;
> +    SET_SYSTEM_FIELD(env, HEX_SREG_MODECTL, MODECTL_W, thread_wait_mask);
>

Do you want to set modectl when cpu->globalregs is false?


> +}
> +
> +static void hexagon_wait_thread(CPUHexagonState *env, uint32_t PC)
> +{
> +    g_assert(bql_locked());
> +
> +    if (qemu_loglevel_mask(LOG_GUEST_ERROR) &&
> +        (env->k0_lock_state != HEX_LOCK_UNLOCKED ||
> +         env->tlb_lock_state != HEX_LOCK_UNLOCKED)) {
> +        qemu_log("WARNING: executing wait() with acquired lock"
> +                 "may lead to deadlock\n");
> +    }
> +    g_assert(get_exe_mode(env) != HEX_EXE_MODE_WAIT);
> +
> +    CPUState *cs = env_cpu(env);
> +    /*
> +     * The addtion of cpu_has_work is borrowed from arm's wfi helper
> +     * and is critical for our stability
> +     */
> +    if ((cs->exception_index != HEX_EVENT_NONE) ||
> +        (cpu_has_work(cs))) {
> +        qemu_log_mask(CPU_LOG_INT,
> +            "%s: thread %d skipping WAIT mode, have some work\n",
>

Don't use %d


> +            __func__, env->threadId);
> +        return;
> +    }
> +    set_wait_mode(env);
> +    env->wait_next_pc = PC + 4;
> +
> +    cpu_interrupt(cs, CPU_INTERRUPT_HALT);
> +}
> +
> +void HELPER(wait)(CPUHexagonState *env, uint32_t PC)

+{
> +    BQL_LOCK_GUARD();
> +
> +    if (!fIN_DEBUG_MODE(env->threadId)) {
> +        hexagon_wait_thread(env, PC);
> +    }
>  }
>
>  void HELPER(resume)(CPUHexagonState *env, uint32_t mask)
> --
> 2.34.1
>

Otherwise
Reviewed-by: Taylor Simpson <[email protected]>

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