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authorBarry Song <barry.song@analog.com>2009-12-08 09:55:37 +0000
committerMike Frysinger <vapier@gentoo.org>2009-12-15 00:16:52 -0500
commitd1be2e485bfb5e3ee3ef5d2131f0151f9a3c4387 (patch)
tree58cb8950840e263f2f1e0dd9d18a5a6df0aa7578 /arch
parent88f7c2fb0fa96887c7be8cdb00afb1a6f9d7894e (diff)
Blackfin: add support for TIF_NOTIFY_RESUME
Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/blackfin/include/asm/thread_info.h2
-rw-r--r--arch/blackfin/kernel/signal.c18
-rw-r--r--arch/blackfin/mach-common/entry.S4
3 files changed, 23 insertions, 1 deletions
diff --git a/arch/blackfin/include/asm/thread_info.h b/arch/blackfin/include/asm/thread_info.h
index afb3a862638..a40d9368c38 100644
--- a/arch/blackfin/include/asm/thread_info.h
+++ b/arch/blackfin/include/asm/thread_info.h
@@ -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)
diff --git a/arch/blackfin/kernel/signal.c b/arch/blackfin/kernel/signal.c
index 9d90c18fab2..e0fd63e9e38 100644
--- a/arch/blackfin/kernel/signal.c
+++ b/arch/blackfin/kernel/signal.c
@@ -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();
+ }
+}
+
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index f3f8bb46b51..b0ed0b487ff 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -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: