diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/h8300/kernel/signal.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/h8300/kernel/signal.c | 563 |
1 files changed, 0 insertions, 563 deletions
diff --git a/ANDROID_3.4.5/arch/h8300/kernel/signal.c b/ANDROID_3.4.5/arch/h8300/kernel/signal.c deleted file mode 100644 index af842c36..00000000 --- a/ANDROID_3.4.5/arch/h8300/kernel/signal.c +++ /dev/null @@ -1,563 +0,0 @@ -/* - * linux/arch/h8300/kernel/signal.c - * - * Copyright (C) 1991, 1992 Linus Torvalds - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file COPYING in the main directory of this archive - * for more details. - */ - -/* - * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp> - * and David McCullough <davidm@snapgear.com> - * - * Based on - * Linux/m68k by Hamish Macdonald - */ - -/* - * ++roman (07/09/96): implemented signal stacks (specially for tosemu on - * Atari :-) Current limitation: Only one sigstack can be active at one time. - * If a second signal with SA_ONSTACK set arrives while working on a sigstack, - * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested - * signal handlers! - */ - -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/kernel.h> -#include <linux/signal.h> -#include <linux/syscalls.h> -#include <linux/errno.h> -#include <linux/wait.h> -#include <linux/ptrace.h> -#include <linux/unistd.h> -#include <linux/stddef.h> -#include <linux/highuid.h> -#include <linux/personality.h> -#include <linux/tty.h> -#include <linux/binfmts.h> -#include <linux/freezer.h> -#include <linux/tracehook.h> - -#include <asm/setup.h> -#include <asm/uaccess.h> -#include <asm/pgtable.h> -#include <asm/traps.h> -#include <asm/ucontext.h> - -#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) - -asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); - -/* - * Atomically swap in the new signal mask, and wait for a signal. - */ -asmlinkage int do_sigsuspend(struct pt_regs *regs) -{ - old_sigset_t mask = regs->er3; - 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->er0 = -EINTR; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - if (do_signal(regs, &saveset)) - return -EINTR; - } -} - -asmlinkage int -do_rt_sigsuspend(struct pt_regs *regs) -{ - sigset_t *unewset = (sigset_t *)regs->er1; - size_t sigsetsize = (size_t)regs->er2; - 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->er0 = -EINTR; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - if (do_signal(regs, &saveset)) - 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 -sys_sigaltstack(const stack_t *uss, stack_t *uoss) -{ - return do_sigaltstack(uss, uoss, rdusp()); -} - - -/* - * Do a signal return; undo the signal stack. - * - * Keep the return code on the stack quadword aligned! - * That makes the cache flush below easier. - */ - -struct sigframe -{ - long dummy_er0; - long dummy_vector; -#if defined(CONFIG_CPU_H8S) - short dummy_exr; -#endif - long dummy_pc; - char *pretcode; - unsigned char retcode[8]; - unsigned long extramask[_NSIG_WORDS-1]; - struct sigcontext sc; - int sig; -} __attribute__((aligned(2),packed)); - -struct rt_sigframe -{ - long dummy_er0; - long dummy_vector; -#if defined(CONFIG_CPU_H8S) - short dummy_exr; -#endif - long dummy_pc; - char *pretcode; - struct siginfo *pinfo; - void *puc; - unsigned char retcode[8]; - struct siginfo info; - struct ucontext uc; - int sig; -} __attribute__((aligned(2),packed)); - -static inline int -restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc, - int *pd0) -{ - int err = 0; - unsigned int ccr; - unsigned int usp; - unsigned int er0; - - /* Always make any pending restarted system calls return -EINTR */ - current_thread_info()->restart_block.fn = do_no_restart_syscall; - -#define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */ - COPY(er1); - COPY(er2); - COPY(er3); - COPY(er5); - COPY(pc); - ccr = regs->ccr & 0x10; - COPY(ccr); -#undef COPY - regs->ccr &= 0xef; - regs->ccr |= ccr; - regs->orig_er0 = -1; /* disable syscall checks */ - err |= __get_user(usp, &usc->sc_usp); - wrusp(usp); - - err |= __get_user(er0, &usc->sc_er0); - *pd0 = er0; - return err; -} - -asmlinkage int do_sigreturn(unsigned long __unused,...) -{ - struct pt_regs *regs = (struct pt_regs *) (&__unused - 1); - unsigned long usp = rdusp(); - struct sigframe *frame = (struct sigframe *)(usp - 4); - sigset_t set; - int er0; - - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - if (__get_user(set.sig[0], &frame->sc.sc_mask) || - (_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, &er0)) - goto badframe; - return er0; - -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -asmlinkage int do_rt_sigreturn(unsigned long __unused,...) -{ - struct pt_regs *regs = (struct pt_regs *) &__unused; - unsigned long usp = rdusp(); - struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4); - sigset_t set; - int er0; - - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) - goto badframe; - - sigdelsetmask(&set, ~_BLOCKABLE); - spin_unlock_irq(¤t->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_lock_irq(¤t->sighand->siglock); - - if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0)) - goto badframe; - - if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT) - goto badframe; - - return er0; - -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, - unsigned long mask) -{ - int err = 0; - - err |= __put_user(regs->er0, &sc->sc_er0); - err |= __put_user(regs->er1, &sc->sc_er1); - err |= __put_user(regs->er2, &sc->sc_er2); - err |= __put_user(regs->er3, &sc->sc_er3); - err |= __put_user(regs->er4, &sc->sc_er4); - err |= __put_user(regs->er5, &sc->sc_er5); - err |= __put_user(regs->er6, &sc->sc_er6); - err |= __put_user(rdusp(), &sc->sc_usp); - err |= __put_user(regs->pc, &sc->sc_pc); - err |= __put_user(regs->ccr, &sc->sc_ccr); - err |= __put_user(mask, &sc->sc_mask); - - return err; -} - -static inline void * -get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) -{ - unsigned long usp; - - /* Default to using normal stack. */ - usp = rdusp(); - - /* This is the X/Open sanctioned signal stack switching. */ - if (ka->sa.sa_flags & SA_ONSTACK) { - if (!sas_ss_flags(usp)) - usp = current->sas_ss_sp + current->sas_ss_size; - } - return (void *)((usp - 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 usig; - unsigned char *ret; - - frame = get_sigframe(ka, regs, sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - goto give_sigsegv; - - usig = current_thread_info()->exec_domain - && current_thread_info()->exec_domain->signal_invmap - && sig < 32 - ? current_thread_info()->exec_domain->signal_invmap[sig] - : sig; - - err |= __put_user(usig, &frame->sig); - if (err) - goto give_sigsegv; - - err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); - if (err) - goto give_sigsegv; - - if (_NSIG_WORDS > 1) { - err |= copy_to_user(frame->extramask, &set->sig[1], - sizeof(frame->extramask)); - if (err) - goto give_sigsegv; - } - - ret = frame->retcode; - if (ka->sa.sa_flags & SA_RESTORER) - ret = (unsigned char *)(ka->sa.sa_restorer); - else { - /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */ - err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff), - (unsigned long *)(frame->retcode + 0)); - err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4)); - } - - /* Set up to return from userspace. */ - err |= __put_user(ret, &frame->pretcode); - - if (err) - goto give_sigsegv; - - /* Set up registers for signal handler */ - wrusp ((unsigned long) frame); - regs->pc = (unsigned long) ka->sa.sa_handler; - regs->er0 = (current_thread_info()->exec_domain - && current_thread_info()->exec_domain->signal_invmap - && sig < 32 - ? current_thread_info()->exec_domain->signal_invmap[sig] - : sig); - regs->er1 = (unsigned long)&(frame->sc); - regs->er5 = current->mm->start_data; /* GOT base */ - - return; - -give_sigsegv: - force_sigsegv(sig, current); -} - -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; - int err = 0; - int usig; - unsigned char *ret; - - frame = get_sigframe(ka, regs, sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - goto give_sigsegv; - - usig = current_thread_info()->exec_domain - && current_thread_info()->exec_domain->signal_invmap - && sig < 32 - ? current_thread_info()->exec_domain->signal_invmap[sig] - : sig; - - err |= __put_user(usig, &frame->sig); - if (err) - goto give_sigsegv; - - err |= __put_user(&frame->info, &frame->pinfo); - err |= __put_user(&frame->uc, &frame->puc); - err |= copy_siginfo_to_user(&frame->info, info); - if (err) - goto give_sigsegv; - - /* Create the ucontext. */ - err |= __put_user(0, &frame->uc.uc_flags); - err |= __put_user(0, &frame->uc.uc_link); - err |= __put_user((void *)current->sas_ss_sp, - &frame->uc.uc_stack.ss_sp); - err |= __put_user(sas_ss_flags(rdusp()), - &frame->uc.uc_stack.ss_flags); - err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); - err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); - err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); - if (err) - goto give_sigsegv; - - /* Set up to return from userspace. */ - ret = frame->retcode; - if (ka->sa.sa_flags & SA_RESTORER) - ret = (unsigned char *)(ka->sa.sa_restorer); - else { - /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */ - err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff), - (unsigned long *)(frame->retcode + 0)); - err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4)); - } - err |= __put_user(ret, &frame->pretcode); - - if (err) - goto give_sigsegv; - - /* Set up registers for signal handler */ - wrusp ((unsigned long) frame); - regs->pc = (unsigned long) ka->sa.sa_handler; - regs->er0 = (current_thread_info()->exec_domain - && current_thread_info()->exec_domain->signal_invmap - && sig < 32 - ? current_thread_info()->exec_domain->signal_invmap[sig] - : sig); - regs->er1 = (unsigned long)&(frame->info); - regs->er2 = (unsigned long)&frame->uc; - regs->er5 = current->mm->start_data; /* GOT base */ - - return; - -give_sigsegv: - force_sigsegv(sig, current); -} - -/* - * OK, we're invoking a handler - */ -static void -handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, - sigset_t *oldset, struct pt_regs * regs) -{ - /* are we from a system call? */ - if (regs->orig_er0 >= 0) { - switch (regs->er0) { - case -ERESTART_RESTARTBLOCK: - case -ERESTARTNOHAND: - regs->er0 = -EINTR; - break; - - case -ERESTARTSYS: - if (!(ka->sa.sa_flags & SA_RESTART)) { - regs->er0 = -EINTR; - break; - } - /* fallthrough */ - case -ERESTARTNOINTR: - regs->er0 = regs->orig_er0; - regs->pc -= 2; - } - } - - /* set up the stack frame */ - if (ka->sa.sa_flags & SA_SIGINFO) - setup_rt_frame(sig, ka, info, oldset, regs); - else - setup_frame(sig, ka, oldset, regs); - - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); - if (!(ka->sa.sa_flags & SA_NODEFER)) - sigaddset(¤t->blocked,sig); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); -} - -/* - * Note that 'init' is a special process: it doesn't get signals it doesn't - * want to handle. Thus you cannot kill init even with a SIGKILL even by - * mistake. - */ -asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset) -{ - siginfo_t info; - int signr; - struct k_sigaction ka; - - /* - * We want the common case to go fast, which - * is why we may in certain cases get here from - * kernel mode. Just return without doing anything - * if so. - */ - if ((regs->ccr & 0x10)) - return 1; - - if (try_to_freeze()) - goto no_signal; - - current->thread.esp0 = (unsigned long) regs; - - if (!oldset) - oldset = ¤t->blocked; - - signr = get_signal_to_deliver(&info, &ka, regs, NULL); - if (signr > 0) { - /* Whee! Actually deliver the signal. */ - handle_signal(signr, &info, &ka, oldset, regs); - return 1; - } - no_signal: - /* Did we come from a system call? */ - if (regs->orig_er0 >= 0) { - /* Restart the system call - no handlers present */ - if (regs->er0 == -ERESTARTNOHAND || - regs->er0 == -ERESTARTSYS || - regs->er0 == -ERESTARTNOINTR) { - regs->er0 = regs->orig_er0; - regs->pc -= 2; - } - if (regs->er0 == -ERESTART_RESTARTBLOCK){ - regs->er0 = __NR_restart_syscall; - regs->pc -= 2; - } - } - return 0; -} - -asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags) -{ - if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) - do_signal(regs, NULL); - - if (thread_info_flags & _TIF_NOTIFY_RESUME) { - clear_thread_flag(TIF_NOTIFY_RESUME); - tracehook_notify_resume(regs); - if (current->replacement_session_keyring) - key_replace_session_keyring(); - } -} |