[PATCH] TIF_RESTORE_SIGMASK support for arch/powerpc
Implement the TIF_RESTORE_SIGMASK flag in the new arch/powerpc kernel, for
both 32-bit and 64-bit system call paths.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index d8da2a3..f20a672 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -227,7 +227,7 @@
MTMSRD(r10)
lwz r9,TI_FLAGS(r12)
li r8,-_LAST_ERRNO
- andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL)
+ andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL|_TIF_RESTORE_SIGMASK)
bne- syscall_exit_work
cmplw 0,r3,r8
blt+ syscall_exit_cont
@@ -357,7 +357,7 @@
lwz r5,_MSR(r1)
andi. r5,r5,MSR_PR
beq ret_from_except
- andi. r0,r9,_TIF_SIGPENDING
+ andi. r0,r9,_TIF_SIGPENDING|_TIF_RESTORE_SIGMASK
beq ret_from_except
b do_user_signal
8:
@@ -683,7 +683,7 @@
/* Check current_thread_info()->flags */
rlwinm r9,r1,0,0,(31-THREAD_SHIFT)
lwz r9,TI_FLAGS(r9)
- andi. r0,r9,(_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL)
+ andi. r0,r9,(_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL|_TIF_RESTORE_SIGMASK)
bne do_work
restore_user:
@@ -917,7 +917,7 @@
lwz r9,TI_FLAGS(r9)
andi. r0,r9,_TIF_NEED_RESCHED
bne- do_resched
- andi. r0,r9,_TIF_SIGPENDING
+ andi. r0,r9,_TIF_SIGPENDING|_TIF_RESTORE_SIGMASK
beq restore_user
do_user_signal: /* r10 contains MSR_KERNEL here */
ori r10,r10,MSR_EE
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 5420363..388f861 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -160,7 +160,7 @@
mtmsrd r10,1
ld r9,TI_FLAGS(r12)
li r11,-_LAST_ERRNO
- andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL|_TIF_SAVE_NVGPRS|_TIF_NOERROR)
+ andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL|_TIF_SAVE_NVGPRS|_TIF_NOERROR|_TIF_RESTORE_SIGMASK)
bne- syscall_exit_work
cmpld r3,r11
ld r5,_CCR(r1)
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 7f0d5ce..3747ab0 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -1128,7 +1128,7 @@
{
siginfo_t info;
struct k_sigaction ka;
- unsigned int frame, newsp;
+ unsigned int newsp;
int signr, ret;
#ifdef CONFIG_PPC32
@@ -1139,11 +1139,11 @@
}
#endif
- if (!oldset)
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = ¤t->saved_sigmask;
+ else if (!oldset)
oldset = ¤t->blocked;
- newsp = frame = 0;
-
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
#ifdef CONFIG_PPC32
no_signal:
@@ -1173,8 +1173,14 @@
}
}
- if (signr == 0)
+ if (signr == 0) {
+ /* No signal to deliver -- put the saved sigmask back */
+ if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+ sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
+ }
return 0; /* no signals delivered */
+ }
if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size
&& !on_sig_stack(regs->gpr[1]))
@@ -1207,6 +1213,10 @@
sigaddset(¤t->blocked, signr);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
+ /* A signal was successfully delivered; the saved sigmask is in
+ its frame, and we can clear the TIF_RESTORE_SIGMASK flag */
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
}
return ret;
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index a4a6812..b319311 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -520,11 +520,15 @@
if (test_thread_flag(TIF_32BIT))
return do_signal32(oldset, regs);
- if (!oldset)
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = ¤t->saved_sigmask;
+ else if (!oldset)
oldset = ¤t->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
+ int ret;
+
/* Whee! Actually deliver the signal. */
if (TRAP(regs) == 0x0C00)
syscall_restart(regs, &ka);
@@ -537,7 +541,14 @@
if (current->thread.dabr)
set_dabr(current->thread.dabr);
- return handle_signal(signr, &ka, &info, oldset, regs);
+ ret = handle_signal(signr, &ka, &info, oldset, regs);
+
+ /* If a signal was successfully delivered, the saved sigmask is in
+ its frame, and we can clear the TIF_RESTORE_SIGMASK flag */
+ if (ret && test_thread_flag(TIF_RESTORE_SIGMASK))
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+
+ return ret;
}
if (TRAP(regs) == 0x0C00) { /* System Call! */
@@ -553,6 +564,11 @@
regs->result = 0;
}
}
+ /* No signal to deliver -- put the saved sigmask back */
+ if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+ sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
+ }
return 0;
}
diff --git a/arch/powerpc/kernel/systbl.S b/arch/powerpc/kernel/systbl.S
index 6801317..007b15e 100644
--- a/arch/powerpc/kernel/systbl.S
+++ b/arch/powerpc/kernel/systbl.S
@@ -321,3 +321,5 @@
SYSCALL(inotify_rm_watch)
SYSCALL(spu_run)
SYSCALL(spu_create)
+COMPAT_SYS(pselect6)
+COMPAT_SYS(ppoll)
diff --git a/include/asm-powerpc/thread_info.h b/include/asm-powerpc/thread_info.h
index 7e09d7c..67cdaf3 100644
--- a/include/asm-powerpc/thread_info.h
+++ b/include/asm-powerpc/thread_info.h
@@ -122,6 +122,7 @@
#define TIF_RESTOREALL 12 /* Restore all regs (implies NOERROR) */
#define TIF_SAVE_NVGPRS 13 /* Save r14-r31 in signal frame */
#define TIF_NOERROR 14 /* Force successful syscall return */
+#define TIF_RESTORE_SIGMASK 15 /* Restore signal mask in do_signal */
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
@@ -138,10 +139,12 @@
#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
#define _TIF_SAVE_NVGPRS (1<<TIF_SAVE_NVGPRS)
#define _TIF_NOERROR (1<<TIF_NOERROR)
+#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
#define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
- _TIF_NEED_RESCHED | _TIF_RESTOREALL)
+ _TIF_NEED_RESCHED | _TIF_RESTOREALL | \
+ _TIF_RESTORE_SIGMASK)
#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR|_TIF_SAVE_NVGPRS)
#endif /* __KERNEL__ */
diff --git a/include/asm-powerpc/unistd.h b/include/asm-powerpc/unistd.h
index 76daec4..a40cdff 100644
--- a/include/asm-powerpc/unistd.h
+++ b/include/asm-powerpc/unistd.h
@@ -298,8 +298,10 @@
#define __NR_inotify_rm_watch 277
#define __NR_spu_run 278
#define __NR_spu_create 279
+#define __NR_pselect6 280
+#define __NR_ppoll 281
-#define __NR_syscalls 280
+#define __NR_syscalls 282
#ifdef __KERNEL__
#define __NR__exit __NR_exit