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https://github.com/torvalds/linux.git
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[PATCH] frv: improve signal handling
The attached patch improves the signal handling:
(1) It makes do_signal() static as it isn't called from anywhere outside of
the arch code.
(2) It removes the regs argument to all the static functions within that file,
using __frame instead (which is the same thing held in a global register).
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Howells
Linus Torvalds
parent
8efc0ab50e
commit
fef2b580eb
@ -35,7 +35,7 @@ struct fdpic_func_descriptor {
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unsigned long GOT;
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};
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asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
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static int do_signal(sigset_t *oldset);
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/*
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* Atomically swap in the new signal mask, and wait for a signal.
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@ -55,7 +55,7 @@ asmlinkage int sys_sigsuspend(int history0, int history1, old_sigset_t mask)
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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(__frame, &saveset))
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if (do_signal(&saveset))
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/* return the signal number as the return value of this function
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* - this is an utterly evil hack. syscalls should not invoke do_signal()
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* as entry.S sets regs->gr8 to the return value of the system call
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@ -91,7 +91,7 @@ asmlinkage int sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize)
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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(__frame, &saveset))
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if (do_signal(&saveset))
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/* return the signal number as the return value of this function
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* - this is an utterly evil hack. syscalls should not invoke do_signal()
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* as entry.S sets regs->gr8 to the return value of the system call
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@ -276,13 +276,12 @@ static int setup_sigcontext(struct sigcontext __user *sc, unsigned long mask)
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* Determine which stack to use..
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*/
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static inline void __user *get_sigframe(struct k_sigaction *ka,
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struct pt_regs *regs,
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size_t frame_size)
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{
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unsigned long sp;
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/* Default to using normal stack */
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sp = regs->sp;
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sp = __frame->sp;
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa.sa_flags & SA_ONSTACK) {
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@ -291,19 +290,19 @@ static inline void __user *get_sigframe(struct k_sigaction *ka,
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}
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return (void __user *) ((sp - frame_size) & ~7UL);
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} /* end get_sigframe() */
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/*****************************************************************************/
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/*
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*
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*/
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static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
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struct pt_regs *regs)
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static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set)
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{
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struct sigframe __user *frame;
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int rsig;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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frame = get_sigframe(ka, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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goto give_sigsegv;
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@ -347,18 +346,18 @@ static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
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}
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/* set up registers for signal handler */
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regs->sp = (unsigned long) frame;
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regs->lr = (unsigned long) &frame->retcode;
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regs->gr8 = sig;
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__frame->sp = (unsigned long) frame;
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__frame->lr = (unsigned long) &frame->retcode;
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__frame->gr8 = sig;
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if (get_personality & FDPIC_FUNCPTRS) {
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struct fdpic_func_descriptor __user *funcptr =
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(struct fdpic_func_descriptor *) ka->sa.sa_handler;
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__get_user(regs->pc, &funcptr->text);
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__get_user(regs->gr15, &funcptr->GOT);
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__get_user(__frame->pc, &funcptr->text);
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__get_user(__frame->gr15, &funcptr->GOT);
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} else {
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regs->pc = (unsigned long) ka->sa.sa_handler;
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regs->gr15 = 0;
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__frame->pc = (unsigned long) ka->sa.sa_handler;
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__frame->gr15 = 0;
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}
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set_fs(USER_DS);
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@ -369,7 +368,7 @@ static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
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#if DEBUG_SIG
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printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
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sig, current->comm, current->pid, frame, regs->pc,
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sig, current->comm, current->pid, frame, __frame->pc,
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frame->pretcode);
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#endif
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@ -386,12 +385,12 @@ give_sigsegv:
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*
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*/
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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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sigset_t *set)
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{
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struct rt_sigframe __user *frame;
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int rsig;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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frame = get_sigframe(ka, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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goto give_sigsegv;
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@ -414,7 +413,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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if (__put_user(0, &frame->uc.uc_flags) ||
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__put_user(0, &frame->uc.uc_link) ||
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__put_user((void*)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
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__put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
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__put_user(sas_ss_flags(__frame->sp), &frame->uc.uc_stack.ss_flags) ||
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__put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size))
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goto give_sigsegv;
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@ -445,19 +444,19 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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}
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/* Set up registers for signal handler */
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regs->sp = (unsigned long) frame;
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regs->lr = (unsigned long) &frame->retcode;
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regs->gr8 = sig;
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regs->gr9 = (unsigned long) &frame->info;
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__frame->sp = (unsigned long) frame;
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__frame->lr = (unsigned long) &frame->retcode;
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__frame->gr8 = sig;
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__frame->gr9 = (unsigned long) &frame->info;
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if (get_personality & FDPIC_FUNCPTRS) {
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struct fdpic_func_descriptor *funcptr =
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(struct fdpic_func_descriptor __user *) ka->sa.sa_handler;
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__get_user(regs->pc, &funcptr->text);
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__get_user(regs->gr15, &funcptr->GOT);
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__get_user(__frame->pc, &funcptr->text);
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__get_user(__frame->gr15, &funcptr->GOT);
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} else {
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regs->pc = (unsigned long) ka->sa.sa_handler;
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regs->gr15 = 0;
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__frame->pc = (unsigned long) ka->sa.sa_handler;
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__frame->gr15 = 0;
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}
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set_fs(USER_DS);
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@ -468,7 +467,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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#if DEBUG_SIG
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printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
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sig, current->comm, current->pid, frame, regs->pc,
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sig, current->comm, current->pid, frame, __frame->pc,
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frame->pretcode);
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#endif
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@ -485,38 +484,37 @@ give_sigsegv:
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* OK, we're invoking a handler
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*/
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static int handle_signal(unsigned long sig, siginfo_t *info,
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struct k_sigaction *ka, sigset_t *oldset,
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struct pt_regs *regs)
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struct k_sigaction *ka, sigset_t *oldset)
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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 (in_syscall(regs)) {
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if (in_syscall(__frame)) {
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/* If so, check system call restarting.. */
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switch (regs->gr8) {
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switch (__frame->gr8) {
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case -ERESTART_RESTARTBLOCK:
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case -ERESTARTNOHAND:
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regs->gr8 = -EINTR;
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__frame->gr8 = -EINTR;
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break;
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case -ERESTARTSYS:
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if (!(ka->sa.sa_flags & SA_RESTART)) {
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regs->gr8 = -EINTR;
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__frame->gr8 = -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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regs->gr8 = regs->orig_gr8;
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regs->pc -= 4;
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__frame->gr8 = __frame->orig_gr8;
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__frame->pc -= 4;
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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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ret = setup_rt_frame(sig, ka, info, oldset, regs);
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ret = setup_rt_frame(sig, ka, info, oldset);
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else
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ret = setup_frame(sig, ka, oldset, regs);
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ret = setup_frame(sig, ka, oldset);
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if (ret) {
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spin_lock_irq(¤t->sighand->siglock);
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@ -538,7 +536,7 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
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* want to handle. Thus you cannot kill init even with a SIGKILL even by
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* mistake.
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*/
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int do_signal(struct pt_regs *regs, sigset_t *oldset)
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static int do_signal(sigset_t *oldset)
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{
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struct k_sigaction ka;
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siginfo_t info;
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@ -550,7 +548,7 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
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* kernel mode. Just return without doing anything
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* if so.
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*/
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if (!user_mode(regs))
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if (!user_mode(__frame))
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return 1;
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if (try_to_freeze())
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@ -559,24 +557,24 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
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if (!oldset)
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oldset = ¤t->blocked;
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signr = get_signal_to_deliver(&info, &ka, regs, NULL);
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signr = get_signal_to_deliver(&info, &ka, __frame, NULL);
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if (signr > 0)
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return handle_signal(signr, &info, &ka, oldset, regs);
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return handle_signal(signr, &info, &ka, oldset);
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no_signal:
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/* Did we come from a system call? */
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if (regs->syscallno >= 0) {
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if (__frame->syscallno >= 0) {
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/* Restart the system call - no handlers present */
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if (regs->gr8 == -ERESTARTNOHAND ||
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regs->gr8 == -ERESTARTSYS ||
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regs->gr8 == -ERESTARTNOINTR) {
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regs->gr8 = regs->orig_gr8;
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regs->pc -= 4;
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if (__frame->gr8 == -ERESTARTNOHAND ||
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__frame->gr8 == -ERESTARTSYS ||
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__frame->gr8 == -ERESTARTNOINTR) {
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__frame->gr8 = __frame->orig_gr8;
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__frame->pc -= 4;
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}
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if (regs->gr8 == -ERESTART_RESTARTBLOCK){
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regs->gr8 = __NR_restart_syscall;
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regs->pc -= 4;
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if (__frame->gr8 == -ERESTART_RESTARTBLOCK){
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__frame->gr8 = __NR_restart_syscall;
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__frame->pc -= 4;
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}
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}
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@ -597,6 +595,6 @@ asmlinkage void do_notify_resume(__u32 thread_info_flags)
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/* deal with pending signal delivery */
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if (thread_info_flags & _TIF_SIGPENDING)
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do_signal(__frame, NULL);
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do_signal(NULL);
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} /* end do_notify_resume() */
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@ -151,7 +151,6 @@ typedef struct sigaltstack {
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size_t ss_size;
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} stack_t;
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extern int do_signal(struct pt_regs *regs, sigset_t *oldset);
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#define ptrace_signal_deliver(regs, cookie) do { } while (0)
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#ifdef __KERNEL__
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