#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
-#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_sycall);
-/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage int
-sys_sigsuspend(old_sigset_t mask, struct pt_regs *regs)
-{
- sigset_t saveset;
-
- mask &= _BLOCKABLE;
- spin_lock_irq(¤t->sighand->siglock);
- saveset = current->blocked;
- siginitset(¤t->blocked, mask);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- regs->r3 = -EINTR;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(regs, &saveset, 1))
- return -EINTR;
- }
-}
-
-asmlinkage int
-sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize,
- struct pt_regs *regs)
-{
- sigset_t saveset, newset;
-
- /* XXX: Don't preclude handling different sized sigset_t's. */
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
-
- if (copy_from_user(&newset, unewset, sizeof(newset)))
- return -EFAULT;
- sigdelsetmask(&newset, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- saveset = current->blocked;
- current->blocked = newset;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- regs->r3 = -EINTR;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(regs, &saveset, 1))
- return -EINTR;
- }
-}
-
-asmlinkage int
-sys_sigaction(int sig, const struct old_sigaction *act,
- struct old_sigaction *oact)
-{
- struct k_sigaction new_ka, old_ka;
- int ret;
-
- if (act) {
- old_sigset_t mask;
- if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
- __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
- __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
- return -EFAULT;
- __get_user(new_ka.sa.sa_flags, &act->sa_flags);
- __get_user(mask, &act->sa_mask);
- siginitset(&new_ka.sa.sa_mask, mask);
- }
-
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
- if (!ret && oact) {
- if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
- __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
- __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
- return -EFAULT;
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
- }
-
- return ret;
-}
-asmlinkage int
+asmlinkage long
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
struct pt_regs *regs)
{
/*
* Do a signal return; undo the signal stack.
*/
-
struct sigframe {
struct sigcontext sc;
unsigned long extramask[_NSIG_WORDS-1];
unsigned long tramp[2]; /* signal trampoline */
};
-static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc, int *rval_p)
+static int restore_sigcontext(struct pt_regs *regs,
+ struct sigcontext __user *sc, int *rval_p)
{
unsigned int err = 0;
return err;
}
-asmlinkage int sys_sigreturn(struct pt_regs *regs)
+asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
{
- struct sigframe *frame =
- (struct sigframe *)(regs->r1 + STATE_SAVE_ARG_SPACE);
+ struct rt_sigframe __user *frame =
+ (struct rt_sigframe __user *)(regs->r1 + STATE_SAVE_ARG_SPACE);
sigset_t set;
int rval;
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
-
- if (__get_user(set.sig[0], &frame->sc.oldmask)
- || (_NSIG_WORDS > 1
- && __copy_from_user(&set.sig[1], &frame->extramask,
- sizeof(frame->extramask))))
- goto badframe;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
-
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- if (restore_sigcontext(regs, &frame->sc, &rval))
- goto badframe;
- return rval;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
-{
- struct rt_sigframe *frame =
- (struct rt_sigframe *)(regs->r1 + STATE_SAVE_ARG_SPACE);
-
- sigset_t set;
- stack_t st;
- int rval;
-
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval))
goto badframe;
- if (__copy_from_user((void *)&st, &frame->uc.uc_stack, sizeof(st)))
- goto badframe;
/* It is more difficult to avoid calling this function than to
call it and ignore errors. */
- do_sigaltstack(&st, NULL, regs->r1);
+ if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->r1))
+ goto badframe;
return rval;
*/
static int
-setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
+setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
unsigned long mask)
{
int err = 0;
/*
* Determine which stack to use..
*/
-static inline void *
+static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
{
/* Default to using normal stack */
if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && !on_sig_stack(sp))
sp = current->sas_ss_sp + current->sas_ss_size;
- return (void *)((sp - frame_size) & -8UL);
-}
-
-static void setup_frame(int sig, struct k_sigaction *ka,
- sigset_t *set, struct pt_regs *regs)
-{
- struct sigframe *frame;
- int err = 0;
- int signal;
-
- frame = get_sigframe(ka, regs, sizeof(*frame));
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
-
- signal = current_thread_info()->exec_domain
- && current_thread_info()->exec_domain->signal_invmap
- && sig < 32
- ? current_thread_info()->exec_domain->signal_invmap[sig]
- : sig;
-
- err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
-
- if (_NSIG_WORDS > 1) {
- err |= __copy_to_user(frame->extramask, &set->sig[1],
- sizeof(frame->extramask));
- }
-
- /* Set up to return from userspace. If provided, use a stub
- already in userspace. */
- /* minus 8 is offset to cater for "rtsd r15,8" offset */
- if (ka->sa.sa_flags & SA_RESTORER) {
- regs->r15 = ((unsigned long)ka->sa.sa_restorer)-8;
- } else {
- /* Note, these encodings are _big endian_! */
-
- /* addi r12, r0, __NR_sigreturn */
- err |= __put_user(0x31800000 | __NR_sigreturn ,
- frame->tramp + 0);
- /* brki r14, 0x8 */
- err |= __put_user(0xb9cc0008, frame->tramp + 1);
-
- /* Return from sighandler will jump to the tramp.
- Negative 8 offset because return is rtsd r15, 8 */
- regs->r15 = ((unsigned long)frame->tramp)-8;
-
- __invalidate_cache_sigtramp((unsigned long)frame->tramp);
- }
-
- if (err)
- goto give_sigsegv;
-
- /* Set up registers for signal handler */
- regs->r1 = (unsigned long) frame - STATE_SAVE_ARG_SPACE;
-
- /* Signal handler args: */
- regs->r5 = signal; /* Arg 0: signum */
- regs->r6 = (unsigned long) &frame->sc; /* arg 1: sigcontext */
-
- /* Offset of 4 to handle microblaze rtid r14, 0 */
- regs->pc = (unsigned long)ka->sa.sa_handler;
-
- set_fs(USER_DS);
-
-#ifdef DEBUG_SIG
- printk(KERN_INFO "SIG deliver (%s:%d): sp=%p pc=%08lx\n",
- current->comm, current->pid, frame, regs->pc);
-#endif
-
- return;
-
-give_sigsegv:
- if (sig == SIGSEGV)
- ka->sa.sa_handler = SIG_DFL;
- force_sig(SIGSEGV, current);
+ return (void __user *)((sp - frame_size) & -8UL);
}
static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
{
- struct rt_sigframe *frame;
+ struct rt_sigframe __user *frame;
int err = 0;
int signal;
? current_thread_info()->exec_domain->signal_invmap[sig]
: sig;
- err |= copy_siginfo_to_user(&frame->info, info);
+ if (info)
+ err |= copy_siginfo_to_user(&frame->info, info);
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
/* minus 8 is offset to cater for "rtsd r15,8" */
- if (ka->sa.sa_flags & SA_RESTORER) {
- regs->r15 = ((unsigned long)ka->sa.sa_restorer)-8;
- } else {
- /* addi r12, r0, __NR_sigreturn */
- err |= __put_user(0x31800000 | __NR_rt_sigreturn ,
- frame->tramp + 0);
- /* brki r14, 0x8 */
- err |= __put_user(0xb9cc0008, frame->tramp + 1);
-
- /* Return from sighandler will jump to the tramp.
- Negative 8 offset because return is rtsd r15, 8 */
- regs->r15 = ((unsigned long)frame->tramp)-8;
-
- __invalidate_cache_sigtramp((unsigned long)frame->tramp);
- }
+ /* addi r12, r0, __NR_sigreturn */
+ err |= __put_user(0x31800000 | __NR_rt_sigreturn ,
+ frame->tramp + 0);
+ /* brki r14, 0x8 */
+ err |= __put_user(0xb9cc0008, frame->tramp + 1);
+
+ /* Return from sighandler will jump to the tramp.
+ Negative 8 offset because return is rtsd r15, 8 */
+ regs->r15 = ((unsigned long)frame->tramp)-8;
+
+ __invalidate_cache_sigtramp((unsigned long)frame->tramp);
if (err)
goto give_sigsegv;
case -ERESTARTNOINTR:
do_restart:
/* offset of 4 bytes to re-execute trap (brki) instruction */
+#ifndef CONFIG_MMU
regs->pc -= 4;
+#else
+ /* offset of 8 bytes required = 4 for rtbd
+ offset, plus 4 for size of
+ "brki r14,8"
+ instruction. */
+ regs->pc -= 8;
+#endif
break;
}
}
* OK, we're invoking a handler
*/
-static void
+static int
handle_signal(unsigned long sig, struct k_sigaction *ka,
siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
{
if (ka->sa.sa_flags & SA_SIGINFO)
setup_rt_frame(sig, ka, info, oldset, regs);
else
- setup_frame(sig, ka, oldset, regs);
+ setup_rt_frame(sig, ka, NULL, oldset, regs);
if (ka->sa.sa_flags & SA_ONESHOT)
ka->sa.sa_handler = SIG_DFL;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
}
+ return 1;
}
/*
if (kernel_mode(regs))
return 1;
- if (!oldset)
+ if (current_thread_info()->status & TS_RESTORE_SIGMASK)
+ oldset = ¤t->saved_sigmask;
+ else
oldset = ¤t->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
/* Whee! Actually deliver the signal. */
if (in_syscall)
handle_restart(regs, &ka, 1);
- handle_signal(signr, &ka, &info, oldset, regs);
+ if (handle_signal(signr, &ka, &info, oldset, regs)) {
+ /*
+ * A signal was successfully delivered; the saved
+ * sigmask will have been stored in the signal frame,
+ * and will be restored by sigreturn, so we can simply
+ * clear the TS_RESTORE_SIGMASK flag.
+ */
+ current_thread_info()->status &=
+ ~TS_RESTORE_SIGMASK;
+ }
return 1;
}
if (in_syscall)
handle_restart(regs, NULL, 0);
+ /*
+ * If there's no signal to deliver, we just put the saved sigmask
+ * back.
+ */
+ if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
+ current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
+ sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
+ }
+
/* Did we come from a system call? */
return 0;
}
git.openpandora.org / pandora-kernel.git / blobdiff