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Blackfin: add support for TIF_NOTIFY_RESUME

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Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Barry Song 2009-12-08 09:55:37 +00:00 committed by Mike Frysinger
parent 88f7c2fb0f
commit d1be2e485b
3 changed files with 23 additions and 1 deletions
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2
arch/blackfin/include/asm/thread_info.h
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@ -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)

18
arch/blackfin/kernel/signal.c
View file

@ -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();
}
}

4
arch/blackfin/mach-common/entry.S
View file

@ -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: