[PATCH] [2/6] TIF_RESTORE_SIGMASK support for arch/powerpc

From: David Woodhouse
Date: Tue Jan 10 2006 - 15:17:27 EST

This patch implements 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@xxxxxxxxxxxxx>

arch/powerpc/kernel/entry_32.S | 8 ++++----
arch/powerpc/kernel/entry_64.S | 2 +-
arch/powerpc/kernel/signal_32.c | 20 +++++++++++++++-----
arch/powerpc/kernel/signal_64.c | 20 ++++++++++++++++++--
arch/powerpc/kernel/systbl.S | 2 ++
include/asm-powerpc/thread_info.h | 5 ++++-
include/asm-powerpc/unistd.h | 4 +++-
7 files changed, 47 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 036b71d..6aa7386 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -227,7 +227,7 @@ ret_from_syscall:
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 @@ save_user_nvgprs_cont:
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 @@ user_exc_return: /* r10 contains MSR_KE
/* 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 @@ recheck:
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 aacebb3..b267045 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -160,7 +160,7 @@ syscall_exit:
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 d3f0b6d..784a4c2 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -1177,7 +1177,7 @@ int do_signal(sigset_t *oldset, struct p
{
siginfo_t info;
struct k_sigaction ka;
- unsigned int frame, newsp;
+ unsigned int newsp;
int signr, ret;

#ifdef CONFIG_PPC32
@@ -1188,11 +1188,11 @@ int do_signal(sigset_t *oldset, struct p
}
#endif

- if (!oldset)
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = &current->saved_sigmask;
+ else if (!oldset)
oldset = &current->blocked;

- newsp = frame = 0;
-
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
#ifdef CONFIG_PPC32
no_signal:
@@ -1222,8 +1222,14 @@ no_signal:
}
}

- 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, &current->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]))
@@ -1256,6 +1262,10 @@ no_signal:
sigaddset(&current->blocked, signr);
recalc_sigpending();
spin_unlock_irq(&current->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 5462bef..2903e11 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -554,11 +554,15 @@ int do_signal(sigset_t *oldset, struct p
if (test_thread_flag(TIF_32BIT))
return do_signal32(oldset, regs);

- if (!oldset)
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = &current->saved_sigmask;
+ else if (!oldset)
oldset = &current->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);
@@ -571,7 +575,14 @@ int do_signal(sigset_t *oldset, struct p
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! */
@@ -587,6 +598,11 @@ int do_signal(sigset_t *oldset, struct p
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, &current->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_add_watch)
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 ac1e80e..27f1312 100644
--- a/include/asm-powerpc/thread_info.h
+++ b/include/asm-powerpc/thread_info.h
@@ -125,6 +125,7 @@ static inline struct thread_info *curren
#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)
@@ -141,10 +142,12 @@ static inline struct thread_info *curren
#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 19eaac3..e9cb713 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

--
dwmw2

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