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CRIS v10: correct do_signal to fix oops and clean up signal handling in general
This fixes a kernel panic on boot due to do_signal not being compatible with it's callers. - do_signal now returns void, and does not have the previous signal set as a parameter. - Remove sys_rt_sigsuspend, we can use the common one instead. - Change sys_sigsuspend to be more like x86, don't call do_signal here. - handle_signal, setup_frame and setup_rt_frame now return -EFAULT if we've delivered a segfault, which is used by callers to perform necessary cleanup. - Break long lines, correct whitespace and formatting errors. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Mikael Starvik <mikael.starvik@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jesper Nilsson
Linus Torvalds
parent
3ea0345be3
commit
a4858d4dab
1 changed files with 110 additions and 137 deletions
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@ -7,7 +7,7 @@
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*
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* Ideas also taken from arch/arm.
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*
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* Copyright (C) 2000, 2001 Axis Communications AB
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* Copyright (C) 2000-2007 Axis Communications AB
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*
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* Authors: Bjorn Wesen (bjornw@axis.com)
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*
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@ -40,83 +40,29 @@
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*/
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#define RESTART_CRIS_SYS(regs) regs->r10 = regs->orig_r10; regs->irp -= 2;
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int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs);
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void do_signal(int canrestart, struct pt_regs *regs);
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/*
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* Atomically swap in the new signal mask, and wait for a signal. Define
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* dummy arguments to be able to reach the regs argument. (Note that this
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* arrangement relies on old_sigset_t occupying one register.)
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*/
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int
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sys_sigsuspend(old_sigset_t mask, long r11, long r12, long r13, long mof,
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int sys_sigsuspend(old_sigset_t mask, long r11, long r12, long r13, long mof,
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long srp, struct pt_regs *regs)
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{
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sigset_t saveset;
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mask &= _BLOCKABLE;
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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current->saved_sigmask = current->blocked;
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siginitset(¤t->blocked, mask);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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regs->r10 = -EINTR;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (do_signal(0, &saveset, regs))
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/* We will get here twice: once to call the signal
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handler, then again to return from the
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sigsuspend system call. When calling the
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signal handler, R10 holds the signal number as
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set through do_signal. The sigsuspend call
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will return with the restored value set above;
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always -EINTR. */
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return regs->r10;
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}
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set_thread_flag(TIF_RESTORE_SIGMASK);
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return -ERESTARTNOHAND;
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}
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/* Define dummy arguments to be able to reach the regs argument. (Note that
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* this arrangement relies on size_t occupying one register.)
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*/
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int
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sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, long r12, long r13,
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long mof, long srp, struct pt_regs *regs)
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{
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sigset_t saveset, newset;
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/* XXX: Don't preclude handling different sized sigset_t's. */
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if (sigsetsize != sizeof(sigset_t))
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return -EINVAL;
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if (copy_from_user(&newset, unewset, sizeof(newset)))
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return -EFAULT;
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sigdelsetmask(&newset, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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current->blocked = newset;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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regs->r10 = -EINTR;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (do_signal(0, &saveset, regs))
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/* We will get here twice: once to call the signal
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handler, then again to return from the
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sigsuspend system call. When calling the
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signal handler, R10 holds the signal number as
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set through do_signal. The sigsuspend call
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will return with the restored value set above;
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always -EINTR. */
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return regs->r10;
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}
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}
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int
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sys_sigaction(int sig, const struct old_sigaction __user *act,
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int sys_sigaction(int sig, const struct old_sigaction __user *act,
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struct old_sigaction *oact)
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{
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struct k_sigaction new_ka, old_ka;
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@ -147,8 +93,7 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
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return ret;
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}
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int
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sys_sigaltstack(const stack_t *uss, stack_t __user *uoss)
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int sys_sigaltstack(const stack_t *uss, stack_t __user *uoss)
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{
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return do_sigaltstack(uss, uoss, rdusp());
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}
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@ -300,8 +245,8 @@ badframe:
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* Set up a signal frame.
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*/
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static int
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setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask)
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static int setup_sigcontext(struct sigcontext __user *sc,
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struct pt_regs *regs, unsigned long mask)
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{
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int err = 0;
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unsigned long usp = rdusp();
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@ -324,7 +269,8 @@ setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned lo
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return err;
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}
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/* figure out where we want to put the new signal frame - usually on the stack */
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/* Figure out where we want to put the new signal frame
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* - usually on the stack. */
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static inline void __user *
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get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
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@ -352,7 +298,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
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* user-mode trampoline.
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*/
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static void setup_frame(int sig, struct k_sigaction *ka,
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static int setup_frame(int sig, struct k_sigaction *ka,
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sigset_t *set, struct pt_regs *regs)
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{
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struct sigframe __user *frame;
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@ -401,13 +347,14 @@ static void setup_frame(int sig, struct k_sigaction *ka,
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wrusp((unsigned long)frame);
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return;
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return 0;
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give_sigsegv:
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force_sigsegv(sig, current);
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return -EFAULT;
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}
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static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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sigset_t *set, struct pt_regs *regs)
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{
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struct rt_sigframe __user *frame;
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@ -444,7 +391,8 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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return_ip = (unsigned long)&frame->retcode;
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/* This is movu.w __NR_rt_sigreturn, r9; break 13; */
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err |= __put_user(0x9c5f, (short __user *)(frame->retcode+0));
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err |= __put_user(__NR_rt_sigreturn, (short __user*)(frame->retcode+2));
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err |= __put_user(__NR_rt_sigreturn,
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(short __user *)(frame->retcode+2));
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err |= __put_user(0xe93d, (short __user *)(frame->retcode+4));
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}
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@ -455,74 +403,82 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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/* Set up registers for signal handler */
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regs->irp = (unsigned long) ka->sa.sa_handler; /* what we enter NOW */
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regs->srp = return_ip; /* what we enter LATER */
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regs->r10 = sig; /* first argument is signo */
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regs->r11 = (unsigned long) &frame->info; /* second argument is (siginfo_t *) */
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regs->r12 = 0; /* third argument is unused */
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/* actually move the usp to reflect the stacked frame */
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/* What we enter NOW */
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regs->irp = (unsigned long) ka->sa.sa_handler;
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/* What we enter LATER */
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regs->srp = return_ip;
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/* First argument is signo */
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regs->r10 = sig;
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/* Second argument is (siginfo_t *) */
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regs->r11 = (unsigned long)&frame->info;
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/* Third argument is unused */
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regs->r12 = 0;
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/* Actually move the usp to reflect the stacked frame */
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wrusp((unsigned long)frame);
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return;
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return 0;
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give_sigsegv:
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force_sigsegv(sig, current);
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return -EFAULT;
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}
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/*
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* OK, we're invoking a handler
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*/
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static inline void
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handle_signal(int canrestart, unsigned long sig,
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static inline int handle_signal(int canrestart, unsigned long sig,
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siginfo_t *info, struct k_sigaction *ka,
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sigset_t *oldset, struct pt_regs *regs)
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{
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int ret;
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/* Are we from a system call? */
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if (canrestart) {
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/* If so, check system call restarting.. */
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switch (regs->r10) {
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case -ERESTART_RESTARTBLOCK:
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case -ERESTARTNOHAND:
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/* ERESTARTNOHAND means that the syscall should only be
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restarted if there was no handler for the signal, and since
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we only get here if there is a handler, we don't restart */
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/* ERESTARTNOHAND means that the syscall should
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* only be restarted if there was no handler for
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* the signal, and since we only get here if there
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* is a handler, we don't restart */
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regs->r10 = -EINTR;
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break;
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case -ERESTARTSYS:
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/* ERESTARTSYS means to restart the syscall if there is no
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handler or the handler was registered with SA_RESTART */
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/* ERESTARTSYS means to restart the syscall if
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* there is no handler or the handler was
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* registered with SA_RESTART */
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if (!(ka->sa.sa_flags & SA_RESTART)) {
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regs->r10 = -EINTR;
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break;
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}
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/* fallthrough */
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case -ERESTARTNOINTR:
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/* ERESTARTNOINTR means that the syscall should be called again
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after the signal handler returns. */
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/* ERESTARTNOINTR means that the syscall should
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* be called again after the signal handler returns. */
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RESTART_CRIS_SYS(regs);
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}
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}
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/* Set up the stack frame */
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if (ka->sa.sa_flags & SA_SIGINFO)
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setup_rt_frame(sig, ka, info, oldset, regs);
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ret = setup_rt_frame(sig, ka, info, oldset, regs);
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else
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setup_frame(sig, ka, oldset, regs);
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if (ka->sa.sa_flags & SA_ONESHOT)
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ka->sa.sa_handler = SIG_DFL;
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ret = setup_frame(sig, ka, oldset, regs);
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if (ret == 0) {
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spin_lock_irq(¤t->sighand->siglock);
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sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
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sigorsets(¤t->blocked, ¤t->blocked,
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&ka->sa.sa_mask);
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if (!(ka->sa.sa_flags & SA_NODEFER))
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sigaddset(¤t->blocked, sig);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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}
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return ret;
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}
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/*
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* Note that 'init' is a special process: it doesn't get signals it doesn't
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@ -536,11 +492,12 @@ handle_signal(int canrestart, unsigned long sig,
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* mode below.
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*/
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int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs)
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void do_signal(int canrestart, struct pt_regs *regs)
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{
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siginfo_t info;
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int signr;
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struct k_sigaction ka;
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sigset_t *oldset;
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/*
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* We want the common case to go fast, which
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@ -549,16 +506,26 @@ int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs)
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* if so.
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*/
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if (!user_mode(regs))
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return 1;
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return;
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if (!oldset)
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if (test_thread_flag(TIF_RESTORE_SIGMASK))
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oldset = ¤t->saved_sigmask;
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else
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oldset = ¤t->blocked;
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signr = get_signal_to_deliver(&info, &ka, regs, NULL);
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if (signr > 0) {
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/* Whee! Actually deliver the signal. */
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handle_signal(canrestart, signr, &info, &ka, oldset, regs);
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return 1;
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if (handle_signal(canrestart, signr, &info, &ka,
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oldset, regs)) {
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/* a signal was successfully delivered; the saved
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* sigmask will have been stored in the signal frame,
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* and will be restored by sigreturn, so we can simply
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* clear the TIF_RESTORE_SIGMASK flag */
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if (test_thread_flag(TIF_RESTORE_SIGMASK))
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clear_thread_flag(TIF_RESTORE_SIGMASK);
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}
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return;
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}
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/* Did we come from a system call? */
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@ -574,5 +541,11 @@ int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs)
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regs->irp -= 2;
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}
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}
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return 0;
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/* if there's no signal to deliver, we just put the saved sigmask
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* back */
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if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
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clear_thread_flag(TIF_RESTORE_SIGMASK);
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sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
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}
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}
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