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Commit b927b3e2 authored by Richard Henderson's avatar Richard Henderson Committed by Linus Torvalds
Browse files

alpha: support new syscalls 



Some of the new syscalls require supporting TIF_RESTORE_SIGMASK.

Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 74fd1b68

arch/alpha/kernel/entry.S

+3 −4
Original line number Diff line number Diff line
@@ -391,11 +391,10 @@ $work_resched: 
	bne	$2, $work_resched



$work_notifysig:

	mov	$sp, $17

	mov	$sp, $16

	br	$1, do_switch_stack

	mov	$5, $21

	mov	$sp, $18

	mov	$31, $16

	mov	$sp, $17

	mov	$5, $18

	jsr	$26, do_notify_resume

	bsr	$1, undo_switch_stack

	br	restore_all

arch/alpha/kernel/signal.c

+63 −47
Original line number Diff line number Diff line
@@ -32,7 +32,7 @@ 
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))



asmlinkage void ret_from_sys_call(void);

static int do_signal(sigset_t *, struct pt_regs *, struct switch_stack *,

static void do_signal(struct pt_regs *, struct switch_stack *,

		      unsigned long, unsigned long);
@@ -146,11 +146,9 @@ sys_rt_sigaction(int sig, const struct sigaction __user *act, 
asmlinkage int

do_sigsuspend(old_sigset_t mask, struct pt_regs *regs, struct switch_stack *sw)

{

	sigset_t oldset;



	mask &= _BLOCKABLE;

	spin_lock_irq(&current->sighand->siglock);

	oldset = current->blocked;

	current->saved_sigmask = current->blocked;

	siginitset(&current->blocked, mask);

	recalc_sigpending();

	spin_unlock_irq(&current->sighand->siglock);
@@ -160,19 +158,17 @@ do_sigsuspend(old_sigset_t mask, struct pt_regs *regs, struct switch_stack *sw) 
	regs->r0 = EINTR;

	regs->r19 = 1;



	while (1) {

	current->state = TASK_INTERRUPTIBLE;

	schedule();

		if (do_signal(&oldset, regs, sw, 0, 0))

			return -EINTR;

	}

	set_thread_flag(TIF_RESTORE_SIGMASK);

	return -ERESTARTNOHAND;

}



asmlinkage int

do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,

		 struct pt_regs *regs, struct switch_stack *sw)

{

	sigset_t oldset, set;

	sigset_t set;



	/* XXX: Don't preclude handling different sized sigset_t's.  */

	if (sigsetsize != sizeof(sigset_t))
@@ -182,7 +178,7 @@ do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, 


	sigdelsetmask(&set, ~_BLOCKABLE);

	spin_lock_irq(&current->sighand->siglock);

	oldset = current->blocked;

	current->saved_sigmask = current->blocked;

	current->blocked = set;

	recalc_sigpending();

	spin_unlock_irq(&current->sighand->siglock);
@@ -192,12 +188,10 @@ do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, 
	regs->r0 = EINTR;

	regs->r19 = 1;



	while (1) {

	current->state = TASK_INTERRUPTIBLE;

	schedule();

		if (do_signal(&oldset, regs, sw, 0, 0))

			return -EINTR;

	}

	set_thread_flag(TIF_RESTORE_SIGMASK);

	return -ERESTARTNOHAND;

}



asmlinkage int
@@ -436,7 +430,7 @@ setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, 
	return err;

}



static void

static int

setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,

	    struct pt_regs *regs, struct switch_stack * sw)

{
@@ -481,13 +475,14 @@ setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, 
		current->comm, current->pid, frame, regs->pc, regs->r26);

#endif



	return;

	return 0;



give_sigsegv:

	force_sigsegv(sig, current);

	return -EFAULT;

}



static void

static int

setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,

	       sigset_t *set, struct pt_regs *regs, struct switch_stack * sw)

{
@@ -543,28 +538,29 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, 
		current->comm, current->pid, frame, regs->pc, regs->r26);

#endif



	return;

	return 0;



give_sigsegv:

	force_sigsegv(sig, current);

	return -EFAULT;

}





/*

 * OK, we're invoking a handler.

 */

static inline void

static inline int

handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,

	      sigset_t *oldset, struct pt_regs * regs, struct switch_stack *sw)

{

	int ret;



	if (ka->sa.sa_flags & SA_SIGINFO)

		setup_rt_frame(sig, ka, info, oldset, regs, sw);

		ret = setup_rt_frame(sig, ka, info, oldset, regs, sw);

	else

		setup_frame(sig, ka, oldset, regs, sw);



	if (ka->sa.sa_flags & SA_RESETHAND)

		ka->sa.sa_handler = SIG_DFL;

		ret = setup_frame(sig, ka, oldset, regs, sw);



	if (ret == 0) {

		spin_lock_irq(&current->sighand->siglock);

		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);

		if (!(ka->sa.sa_flags & SA_NODEFER))
@@ -573,6 +569,9 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info, 
		spin_unlock_irq(&current->sighand->siglock);

	}



	return ret;

}



static inline void

syscall_restart(unsigned long r0, unsigned long r19,

		struct pt_regs *regs, struct k_sigaction *ka)
@@ -611,30 +610,42 @@ syscall_restart(unsigned long r0, unsigned long r19, 
 * restart. "r0" is also used as an indicator whether we can restart at

 * all (if we get here from anything but a syscall return, it will be 0)

 */

static int

do_signal(sigset_t *oldset, struct pt_regs * regs, struct switch_stack * sw,

static void

do_signal(struct pt_regs * regs, struct switch_stack * sw,

	  unsigned long r0, unsigned long r19)

{

	siginfo_t info;

	int signr;

	unsigned long single_stepping = ptrace_cancel_bpt(current);

	struct k_sigaction ka;

	sigset_t *oldset;



	if (!oldset)

	if (test_thread_flag(TIF_RESTORE_SIGMASK))

		oldset = &current->saved_sigmask;

	else

		oldset = &current->blocked;



	/* This lets the debugger run, ... */

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);



	/* ... so re-check the single stepping. */

	single_stepping |= ptrace_cancel_bpt(current);



	if (signr > 0) {

		/* Whee!  Actually deliver the signal.  */

		if (r0) syscall_restart(r0, r19, regs, &ka);

		handle_signal(signr, &ka, &info, oldset, regs, sw);

		if (r0)

			syscall_restart(r0, r19, regs, &ka);

		if (handle_signal(signr, &ka, &info, oldset, regs, sw) == 0) {

			/* A signal was successfully delivered, and the

			   saved sigmask was stored on the signal frame,

			   and will be restored by sigreturn.  So we can

			   simply clear the restore sigmask flag.  */

			if (test_thread_flag(TIF_RESTORE_SIGMASK))

				clear_thread_flag(TIF_RESTORE_SIGMASK);

		}

		if (single_stepping) 

			ptrace_set_bpt(current); /* re-set bpt */

		return 1;

		return;

	}



	if (r0) {
@@ -654,17 +665,22 @@ do_signal(sigset_t *oldset, struct pt_regs * regs, struct switch_stack * sw, 
			break;

		}

	}



	/* If there's no signal to deliver, we just restore the saved mask.  */

	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {

		clear_thread_flag(TIF_RESTORE_SIGMASK);

		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);

	}



	if (single_stepping)

		ptrace_set_bpt(current);	/* re-set breakpoint */



	return 0;

}



void

do_notify_resume(sigset_t *oldset, struct pt_regs *regs,

		 struct switch_stack *sw, unsigned long r0,

		 unsigned long r19, unsigned long thread_info_flags)

do_notify_resume(struct pt_regs *regs, struct switch_stack *sw,

		 unsigned long thread_info_flags,

		 unsigned long r0, unsigned long r19)

{

	if (thread_info_flags & _TIF_SIGPENDING)

		do_signal(oldset, regs, sw, r0, r19);

	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))

		do_signal(regs, sw, r0, r19);

}

arch/alpha/kernel/systbls.S

+32 −0
Original line number Diff line number Diff line
@@ -465,6 +465,38 @@ sys_call_table: 
	.quad sys_inotify_init

	.quad sys_inotify_add_watch		/* 445 */

	.quad sys_inotify_rm_watch

	.quad sys_fdatasync

	.quad sys_kexec_load

	.quad sys_migrate_pages

	.quad sys_openat			/* 450 */

	.quad sys_mkdirat

	.quad sys_mknodat

	.quad sys_fchownat

	.quad sys_futimesat

	.quad sys_fstatat64			/* 455 */

	.quad sys_unlinkat

	.quad sys_renameat

	.quad sys_linkat

	.quad sys_symlinkat

	.quad sys_readlinkat			/* 460 */

	.quad sys_fchmodat

	.quad sys_faccessat

	.quad sys_pselect6

	.quad sys_ppoll

	.quad sys_unshare			/* 465 */

	.quad sys_set_robust_list

	.quad sys_get_robust_list

	.quad sys_splice

	.quad sys_sync_file_range

	.quad sys_tee				/* 470 */

	.quad sys_vmsplice

	.quad sys_move_pages

	.quad sys_getcpu

	.quad sys_epoll_pwait

	.quad sys_utimensat			/* 475 */

	.quad sys_signalfd

	.quad sys_timerfd

	.quad sys_eventfd



	.size sys_call_table, . - sys_call_table

	.type sys_call_table, @object

include/asm-alpha/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -76,12 +76,14 @@ register struct thread_info *__current_thread_info __asm__("$8"); 
#define TIF_UAC_NOFIX		7

#define TIF_UAC_SIGBUS		8

#define TIF_MEMDIE		9

#define TIF_RESTORE_SIGMASK	10	/* restore signal mask in do_signal */



#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)

#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)

#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)



/* Work to do on interrupt/exception return.  */

#define _TIF_WORK_MASK		(_TIF_NOTIFY_RESUME	\

include/asm-alpha/unistd.h

+47 −1
Original line number Diff line number Diff line
@@ -233,6 +233,20 @@ 
#define __NR_osf_memcntl	260	/* not implemented */

#define __NR_osf_fdatasync	261	/* not implemented */



/*

 * Ignore legacy syscalls that we don't use.

 */

#define __IGNORE_alarm

#define __IGNORE_creat

#define __IGNORE_getegid

#define __IGNORE_geteuid

#define __IGNORE_getgid

#define __IGNORE_getpid

#define __IGNORE_getppid

#define __IGNORE_getuid

#define __IGNORE_pause

#define __IGNORE_time

#define __IGNORE_utime



/*

 * Linux-specific system calls begin at 300
@@ -387,10 +401,42 @@ 
#define __NR_inotify_init		444

#define __NR_inotify_add_watch		445

#define __NR_inotify_rm_watch		446

#define __NR_fdatasync			447

#define __NR_kexec_load			448

#define __NR_migrate_pages		449

#define __NR_openat			450

#define __NR_mkdirat			451

#define __NR_mknodat			452

#define __NR_fchownat			453

#define __NR_futimesat			454

#define __NR_fstatat64			455

#define __NR_unlinkat			456

#define __NR_renameat			457

#define __NR_linkat			458

#define __NR_symlinkat			459

#define __NR_readlinkat			460

#define __NR_fchmodat			461

#define __NR_faccessat			462

#define __NR_pselect6			463

#define __NR_ppoll			464

#define __NR_unshare			465

#define __NR_set_robust_list		466

#define __NR_get_robust_list		467

#define __NR_splice			468

#define __NR_sync_file_range		469

#define __NR_tee			470

#define __NR_vmsplice			471

#define __NR_move_pages			472

#define __NR_getcpu			473

#define __NR_epoll_pwait		474

#define __NR_utimensat			475

#define __NR_signalfd			476

#define __NR_timerfd			477

#define __NR_eventfd			478



#ifdef __KERNEL__



#define NR_SYSCALLS			447

#define NR_SYSCALLS			479



#define __ARCH_WANT_IPC_PARSE_VERSION

#define __ARCH_WANT_OLD_READDIR