| /* |
| * 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 <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; |
| } |