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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-04-24 10:30:16 +0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-05-22 07:59:48 +0400 |
| commit | a53bb24e7666870bbc195e295a936aa0a58ce313 (patch) | |
| tree | a6262e348507e0b391993649c70e21e72e1a2cb7 /arch/xtensa | |
| parent | 8314019141e4f7274ea4dc264a47bbb2e17c66dd (diff) | |
| download | linux-a53bb24e7666870bbc195e295a936aa0a58ce313.tar.xz | |
xtensa: add handling of TIF_NOTIFY_RESUME
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/xtensa')
| -rw-r--r-- | arch/xtensa/include/asm/thread_info.h | 1 | ||||
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 5 | ||||
| -rw-r--r-- | arch/xtensa/kernel/signal.c | 20 |
3 files changed, 20 insertions, 6 deletions
diff --git a/arch/xtensa/include/asm/thread_info.h b/arch/xtensa/include/asm/thread_info.h index 6abbedd09d85..81abfd5d01ac 100644 --- a/arch/xtensa/include/asm/thread_info.h +++ b/arch/xtensa/include/asm/thread_info.h @@ -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) diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index b1bb6d79d8b9..7e6236073397 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -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 diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c index bb00cc470ca9..c5e4ec0598d2 100644 --- a/arch/xtensa/kernel/signal.c +++ b/arch/xtensa/kernel/signal.c @@ -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 @@ no_signal: 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(); + } +} |