[RFC PATCH 1/9] hurd: Move thread state manipulation into _hurd_tls_new ()
Samuel Thibault
samuel.thibault@gnu.org
Sun Feb 19 23:32:46 GMT 2023
Applied, thanks!
Sergey Bugaev, le sam. 18 févr. 2023 23:37:09 +0300, a ecrit:
> This is going to be done differently on x86_64.
>
> Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
> ---
> mach/setup-thread.c | 18 ++----------------
> sysdeps/mach/hurd/i386/tls.h | 25 ++++++++++++++++++++-----
> 2 files changed, 22 insertions(+), 21 deletions(-)
>
> diff --git a/mach/setup-thread.c b/mach/setup-thread.c
> index 6ce5c13d..ae24a149 100644
> --- a/mach/setup-thread.c
> +++ b/mach/setup-thread.c
> @@ -83,25 +83,11 @@ weak_alias (__mach_setup_thread, mach_setup_thread)
> kern_return_t
> __mach_setup_tls (thread_t thread)
> {
> - kern_return_t error;
> - struct machine_thread_state ts;
> - mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT;
> - tcbhead_t *tcb;
> -
> - tcb = _dl_allocate_tls (NULL);
> + tcbhead_t *tcb = _dl_allocate_tls (NULL);
> if (tcb == NULL)
> return KERN_RESOURCE_SHORTAGE;
>
> - if (error = __thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR,
> - (natural_t *) &ts, &tssize))
> - return error;
> - assert (tssize == MACHINE_THREAD_STATE_COUNT);
> -
> - _hurd_tls_new (thread, &ts, tcb);
> -
> - error = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
> - (natural_t *) &ts, tssize);
> - return error;
> + return _hurd_tls_new (thread, tcb);
> }
>
> weak_alias (__mach_setup_tls, mach_setup_tls)
> diff --git a/sysdeps/mach/hurd/i386/tls.h b/sysdeps/mach/hurd/i386/tls.h
> index 590abd47..0f8dd241 100644
> --- a/sysdeps/mach/hurd/i386/tls.h
> +++ b/sysdeps/mach/hurd/i386/tls.h
> @@ -378,16 +378,25 @@ _hurd_tls_fork (thread_t child, thread_t orig, struct i386_thread_state *state)
> }
>
> static inline kern_return_t __attribute__ ((unused))
> -_hurd_tls_new (thread_t child, struct i386_thread_state *state, tcbhead_t *tcb)
> +_hurd_tls_new (thread_t child, tcbhead_t *tcb)
> {
> + error_t err;
> + /* Fetch the target thread's state. */
> + struct i386_thread_state state;
> + mach_msg_type_number_t state_count = i386_THREAD_STATE_COUNT;
> + err = __thread_get_state (child, i386_REGS_SEGS_STATE,
> + (thread_state_t) &state,
> + &state_count);
> + if (err)
> + return err;
> + assert (state_count == i386_THREAD_STATE_COUNT);
> /* Fetch the selector set by _hurd_tls_init. */
> int sel;
> asm ("mov %%gs, %w0" : "=q" (sel) : "0" (0));
> - if (sel == state->ds) /* _hurd_tls_init was never called. */
> + if (sel == state.ds) /* _hurd_tls_init was never called. */
> return 0;
>
> HURD_TLS_DESC_DECL (desc, tcb);
> - error_t err;
>
> tcb->tcb = tcb;
> tcb->self = child;
> @@ -397,8 +406,14 @@ _hurd_tls_new (thread_t child, struct i386_thread_state *state, tcbhead_t *tcb)
> else
> err = __i386_set_gdt (child, &sel, desc);
>
> - state->gs = sel;
> - return err;
> + if (err)
> + return err;
> +
> + /* Update gs to use the selector. */
> + state.gs = sel;
> + return __thread_set_state (child, i386_REGS_SEGS_STATE,
> + (thread_state_t) &state,
> + state_count);
> }
>
> /* Global scope switch support. */
> --
> 2.39.2
>
>
--
Samuel
---
Pour une évaluation indépendante, transparente et rigoureuse !
Je soutiens la Commission d'Évaluation de l'Inria.
More information about the Libc-alpha
mailing list