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| author | Barry Song <barry.song@analog.com> | 2009-12-08 09:55:37 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-12-15 00:16:52 -0500 |
| commit | d1be2e485bfb5e3ee3ef5d2131f0151f9a3c4387 (patch) | |
| tree | 58cb8950840e263f2f1e0dd9d18a5a6df0aa7578 /arch/blackfin | |
| parent | 88f7c2fb0fa96887c7be8cdb00afb1a6f9d7894e (diff) | |
| download | lwn-d1be2e485bfb5e3ee3ef5d2131f0151f9a3c4387.tar.gz lwn-d1be2e485bfb5e3ee3ef5d2131f0151f9a3c4387.zip | |
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/blackfin')
| -rw-r--r-- | arch/blackfin/include/asm/thread_info.h | 2 | ||||
| -rw-r--r-- | arch/blackfin/kernel/signal.c | 18 | ||||
| -rw-r--r-- | arch/blackfin/mach-common/entry.S | 4 |
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 afb3a8626380..a40d9368c38a 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 9d90c18fab23..e0fd63e9e38a 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, ¤t->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 f3f8bb46b517..b0ed0b487ff2 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: |