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xtensa: add handling of TIF_NOTIFY_RESUME

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-04-24 02:30:16 -04:00
parent 8314019141
commit a53bb24e76
3 changed files with 20 additions and 6 deletions
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1
arch/xtensa/include/asm/thread_info.h
View file

@ -131,6 +131,7 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_IRET 4 /* return with iret */
#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)

5
arch/xtensa/kernel/entry.S
View file

@ -409,14 +409,15 @@ common_exception_return:
l32i a4, a2, TI_FLAGS
_bbsi.l a4, TIF_NEED_RESCHED, 3f
_bbsi.l a4, TIF_NOTIFY_RESUME, 2f
_bbci.l a4, TIF_SIGPENDING, 4f
l32i a4, a1, PT_DEPC
2: l32i a4, a1, PT_DEPC
bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 4f
/* Call do_signal() */
movi a4, do_signal # int do_signal(struct pt_regs*, sigset_t*)
movi a4, do_notify_resume # int do_notify_resume(struct pt_regs*)
mov a6, a1
callx4 a4
j 1b

20
arch/xtensa/kernel/signal.c
View file

@ -20,6 +20,7 @@
#include <linux/ptrace.h>
#include <linux/personality.h>
#include <linux/freezer.h>
#include <linux/tracehook.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
@ -446,16 +447,13 @@ asmlinkage long xtensa_sigaltstack(const stack_t __user *uss,
* the kernel can handle, and then we build all the user-level signal handling
* stack-frames in one go after that.
*/
void do_signal(struct pt_regs *regs)
static void do_signal(struct pt_regs *regs)
{
siginfo_t info;
int signr;
struct k_sigaction ka;
sigset_t oldset;
if (!user_mode(regs))
return;
if (try_to_freeze())
goto no_signal;
@ -542,3 +540,17 @@ void do_signal(struct pt_regs *regs)
return;
}
void do_notify_resume(struct pt_regs *regs)
{
if (!user_mode(regs))
return;
if (test_thread_flag(TIF_SIGPENDING))
do_signal(regs);
if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) {
tracehook_notify_resume(regs);
if (current->replacement_session_keyring)
key_replace_session_keyring();
}
}