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Commit d1be2e48 authored by Barry Song's avatar Barry Song Committed by Mike Frysinger
Browse files

Blackfin: add support for TIF_NOTIFY_RESUME 



Signed-off-by: default avatarBarry Song <barry.song@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 88f7c2fb

arch/blackfin/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -103,11 +103,13 @@ static inline struct thread_info *current_thread_info(void) 
#define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */

#define TIF_FREEZE              6       /* is freezing for suspend */

#define TIF_IRQ_SYNC            7       /* sync pipeline stage */

#define TIF_NOTIFY_RESUME       8       /* callback before returning to user */



/* as above, but as bit values */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)

#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)

#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)

#define _TIF_FREEZE             (1<<TIF_FREEZE)

arch/blackfin/kernel/signal.c

+18 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/binfmts.h>

#include <linux/freezer.h>

#include <linux/uaccess.h>

#include <linux/tracehook.h>



#include <asm/cacheflush.h>

#include <asm/ucontext.h>
@@ -332,3 +333,20 @@ asmlinkage void do_signal(struct pt_regs *regs) 
		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);

	}

}



/*

 * notification of userspace execution resumption

 */

asmlinkage void do_notify_resume(struct pt_regs *regs)

{

	if (test_thread_flag(TIF_SIGPENDING) || test_thread_flag(TIF_RESTORE_SIGMASK))

		do_signal(regs);



	if (test_thread_flag(TIF_NOTIFY_RESUME)) {

		clear_thread_flag(TIF_NOTIFY_RESUME);

		tracehook_notify_resume(regs);

		if (current->replacement_session_keyring)

			key_replace_session_keyring();

	}

}

arch/blackfin/mach-common/entry.S

+3 −1
Original line number Diff line number Diff line
@@ -713,6 +713,8 @@ ENTRY(_system_call) 
	cc = BITTST(r7, TIF_RESTORE_SIGMASK);

	if cc jump .Lsyscall_do_signals;

	cc = BITTST(r7, TIF_SIGPENDING);

	if cc jump .Lsyscall_do_signals;

	cc = BITTST(r7, TIF_NOTIFY_RESUME);

	if !cc jump .Lsyscall_really_exit;

.Lsyscall_do_signals:

	/* Reenable interrupts.  */
@@ -721,7 +723,7 @@ ENTRY(_system_call) 


	r0 = sp;

	SP += -12;

	call _do_signal;

	call _do_notify_resume;

	SP += 12;



.Lsyscall_really_exit: