On 8/26/21 11:11 PM, i...@bsdimp.com wrote:
> From: Warner Losh <i...@freebsd.org>
>
> cpu_copy shouldbe called when processes are creating new threads. It
Typo "should be"
> copies the current state of the CPU to a new cpu state needed for the
> new thread.
>
> Signed-off-by: Stacey Son <s...@freebsd.org>
> Signed-off-by: Warner Losh <i...@bsdimp.com>
> Signed-off-by: Justin Hibbits <chmeeed...@gmail.com>
> Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
> ---
> bsd-user/main.c | 30 ++++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
>
> diff --git a/bsd-user/main.c b/bsd-user/main.c
> index e2ed9e32ba..b35bcf4d1e 100644
> --- a/bsd-user/main.c
> +++ b/bsd-user/main.c
> @@ -180,6 +180,36 @@ void init_task_state(TaskState *ts)
> ts->sigqueue_table[i].next = NULL;
> }
>
> +CPUArchState *cpu_copy(CPUArchState *env)
> +{
> + CPUState *cpu = env_cpu(env);
> + CPUState *new_cpu = cpu_create(cpu_type);
> + CPUArchState *new_env = new_cpu->env_ptr;
> + CPUBreakpoint *bp;
> + CPUWatchpoint *wp;
> +
> + /* Reset non arch specific state */
> + cpu_reset(new_cpu);
> +
> + memcpy(new_env, env, sizeof(CPUArchState));
> +
> + /*
> + * Clone all break/watchpoints.
> + * Note: Once we support ptrace with hw-debug register access, make sure
> + * BP_CPU break/watchpoints are handled correctly on clone.
> + */
> + QTAILQ_INIT(&cpu->breakpoints);
> + QTAILQ_INIT(&cpu->watchpoints);
> + QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
> + cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
> + }
> + QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
> + cpu_watchpoint_insert(new_cpu, wp->vaddr, wp->len, wp->flags, NULL);
> + }
> +
> + return new_env;
> +}
But where is it called?
