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/*
* linux/arch/cris/kernel/signal.c
*
* Based on arch/i386/kernel/signal.c by
* Copyright (C) 1991, 1992 Linus Torvalds
* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson *
*
* Ideas also taken from arch/arm.
*
* Copyright (C) 2000, 2001 Axis Communications AB
*
* Authors: Bjorn Wesen (bjornw@axis.com)
*
*/
#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>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <asm/processor.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#define DEBUG_SIG 0
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
/* a syscall in Linux/CRIS is a break 13 instruction which is 2 bytes */
/* manipulate regs so that upon return, it will be re-executed */
/* We rely on that pc points to the instruction after "break 13", so the
* library must never do strange things like putting it in a delay slot.
*/
#define RESTART_CRIS_SYS(regs) regs->r10 = regs->orig_r10; regs->irp -= 2;
int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs);
int copy_siginfo_to_user(siginfo_t *to, siginfo_t *from)
{
if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t)))
return -EFAULT;
if (from->si_code < 0)
return __copy_to_user(to, from, sizeof(siginfo_t));
else {
int err;
/* If you change siginfo_t structure, please be sure
this code is fixed accordingly.
It should never copy any pad contained in the structure
to avoid security leaks, but must copy the generic
3 ints plus the relevant union member. */
err = __put_user(from->si_signo, &to->si_signo);
err |= __put_user(from->si_errno, &to->si_errno);
err |= __put_user((short)from->si_code, &to->si_code);
/* First 32bits of unions are always present. */
err |= __put_user(from->si_pid, &to->si_pid);
switch (from->si_code >> 16) {
case __SI_FAULT >> 16:
err |= __put_user(from->si_addr, &to->si_addr);
break;
case __SI_CHLD >> 16:
err |= __put_user(from->si_utime, &to->si_utime);
err |= __put_user(from->si_stime, &to->si_stime);
err |= __put_user(from->si_status, &to->si_status);
default:
err |= __put_user(from->si_uid, &to->si_uid);
break;
/* case __SI_RT: This is not generated by the kernel as of now. */
}
return err;
}
}
/*
* Atomically swap in the new signal mask, and wait for a signal. Define
* dummy arguments to be able to reach the regs argument. (Note that this
* arrangement relies on old_sigset_t occupying one register.)
*/
int
sys_sigsuspend(old_sigset_t mask, long r11, long r12, long r13, long mof,
long srp, struct pt_regs *regs)
{
sigset_t saveset;
mask &= _BLOCKABLE;
spin_lock_irq(¤t->sigmask_lock);
saveset = current->blocked;
siginitset(¤t->blocked, mask);
recalc_sigpending(current);
spin_unlock_irq(¤t->sigmask_lock);
regs->r10 = -EINTR;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal(0, &saveset, regs))
/* We will get here twice: once to call the signal
handler, then again to return from the
sigsuspend system call. When calling the
signal handler, R10 holds the signal number as
set through do_signal. The sigsuspend call
will return with the restored value set above;
always -EINTR. */
return regs->r10;
}
}
/* Define dummy arguments to be able to reach the regs argument. (Note that
* this arrangement relies on size_t occupying one register.)
*/
int
sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, long r12, long r13,
long mof, long srp, 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->sigmask_lock);
saveset = current->blocked;
current->blocked = newset;
recalc_sigpending(current);
spin_unlock_irq(¤t->sigmask_lock);
regs->r10 = -EINTR;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal(0, &saveset, regs))
/* We will get here twice: once to call the signal
handler, then again to return from the
sigsuspend system call. When calling the
signal handler, R10 holds the signal number as
set through do_signal. The sigsuspend call
will return with the restored value set above;
always -EINTR. */
return regs->r10;
}
}
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 (verify_area(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 (verify_area(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;
}
int
sys_sigaltstack(const stack_t *uss, stack_t *uoss)
{
return do_sigaltstack(uss, uoss, rdusp());
}
/*
* Do a signal return; undo the signal stack.
*/
struct sigframe {
struct sigcontext sc;
unsigned long extramask[_NSIG_WORDS-1];
unsigned char retcode[8]; /* trampoline code */
};
struct rt_sigframe {
struct siginfo *pinfo;
void *puc;
struct siginfo info;
struct ucontext uc;
unsigned char retcode[8]; /* trampoline code */
};
static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
{
unsigned int err = 0;
unsigned long old_usp;
/* restore the regs from &sc->regs (same as sc, since regs is first)
* (sc is already checked for VERIFY_READ since the sigframe was
* checked in sys_sigreturn previously)
*/
if (__copy_from_user(regs, sc, sizeof(struct pt_regs)))
goto badframe;
/* make sure the U-flag is set so user-mode cannot fool us */
regs->dccr |= 1 << 8;
/* restore the old USP as it was before we stacked the sc etc.
* (we cannot just pop the sigcontext since we aligned the sp and
* stuff after pushing it)
*/
err |= __get_user(old_usp, &sc->usp);
wrusp(old_usp);
/* TODO: the other ports use regs->orig_XX to disable syscall checks
* after this completes, but we don't use that mechanism. maybe we can
* use it now ?
*/
return err;
badframe:
return 1;
}
/* Define dummy arguments to be able to reach the regs argument. */
asmlinkage int sys_sigreturn(long r10, long r11, long r12, long r13, long mof,
long srp, struct pt_regs *regs)
{
struct sigframe *frame = (struct sigframe *)rdusp();
sigset_t set;
/*
* Since we stacked the signal on a dword boundary,
* then frame should be dword aligned here. If it's
* not, then the user is trying to mess with us.
*/
if (((long)frame) & 3)
goto badframe;
if (verify_area(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->sigmask_lock);
current->blocked = set;
recalc_sigpending(current);
spin_unlock_irq(¤t->sigmask_lock);
if (restore_sigcontext(regs, &frame->sc))
goto badframe;
/* TODO: SIGTRAP when single-stepping as in arm ? */
return regs->r10;
badframe:
force_sig(SIGSEGV, current);
return 0;
}
/* Define dummy arguments to be able to reach the regs argument. */
asmlinkage int sys_rt_sigreturn(long r10, long r11, long r12, long r13,
long mof, long srp, struct pt_regs *regs)
{
struct rt_sigframe *frame = (struct rt_sigframe *)rdusp();
sigset_t set;
stack_t st;
/*
* Since we stacked the signal on a dword boundary,
* then frame should be dword aligned here. If it's
* not, then the user is trying to mess with us.
*/
if (((long)frame) & 3)
goto badframe;
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(¤t->sigmask_lock);
current->blocked = set;
recalc_sigpending(current);
spin_unlock_irq(¤t->sigmask_lock);
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
if (__copy_from_user(&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, rdusp());
return regs->r10;
badframe:
force_sig(SIGSEGV, current);
return 0;
}
/*
* Set up a signal frame.
*/
static int
setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, unsigned long mask)
{
int err = 0;
unsigned long usp = rdusp();
/* copy the regs. they are first in sc so we can use sc directly */
err |= __copy_to_user(sc, regs, sizeof(struct pt_regs));
/* Set the frametype to CRIS_FRAME_NORMAL for the execution of
the signal handler. The frametype will be restored to its previous
value in restore_sigcontext. */
regs->frametype = CRIS_FRAME_NORMAL;
/* then some other stuff */
err |= __put_user(mask, &sc->oldmask);
err |= __put_user(usp, &sc->usp);
return err;
}
/* figure out where we want to put the new signal frame - usually on the stack */
static inline void *
get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
{
unsigned long sp = rdusp();
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
if (! on_sig_stack(sp))
sp = current->sas_ss_sp + current->sas_ss_size;
}
/* make sure the frame is dword-aligned */
sp &= ~3;
return (void *)(sp - frame_size);
}
/* grab and setup a signal frame.
*
* basically we stack a lot of state info, and arrange for the
* user-mode program to return to the kernel using either a
* trampoline which performs the syscall sigreturn, or a provided
* user-mode trampoline.
*/
static void setup_frame(int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs * regs)
{
struct sigframe *frame;
unsigned long return_ip;
int err = 0;
frame = get_sigframe(ka, regs, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
return_ip = (unsigned long)ka->sa.sa_restorer;
} else {
/* trampoline - the desired return ip is the retcode itself */
return_ip = (unsigned long)&frame->retcode;
/* This is movu.w __NR_sigreturn, r9; break 13; */
err |= __put_user(0x9c5f, (short *)(frame->retcode+0));
err |= __put_user(__NR_sigreturn, (short *)(frame->retcode+2));
err |= __put_user(0xe93d, (short *)(frame->retcode+4));
}
if (err)
goto give_sigsegv;
/* Set up registers for signal handler */
regs->irp = (unsigned long) ka->sa.sa_handler; /* what we enter NOW */
regs->srp = return_ip; /* what we enter LATER */
regs->r10 = sig; /* first argument is signo */
/* actually move the usp to reflect the stacked frame */
wrusp((unsigned long)frame);
return;
give_sigsegv:
if (sig == SIGSEGV)
ka->sa.sa_handler = SIG_DFL;
force_sig(SIGSEGV, 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;
unsigned long return_ip;
int err = 0;
frame = get_sigframe(ka, regs, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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;
/* Clear all the bits of the ucontext we don't use. */
err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
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. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
return_ip = (unsigned long)ka->sa.sa_restorer;
} else {
/* trampoline - the desired return ip is the retcode itself */
return_ip = (unsigned long)&frame->retcode;
/* This is movu.w __NR_rt_sigreturn, r9; break 13; */
err |= __put_user(0x9c5f, (short *)(frame->retcode+0));
err |= __put_user(__NR_rt_sigreturn, (short *)(frame->retcode+2));
err |= __put_user(0xe93d, (short *)(frame->retcode+4));
}
if (err)
goto give_sigsegv;
/* TODO what is the current->exec_domain stuff and invmap ? */
/* Set up registers for signal handler */
regs->irp = (unsigned long) ka->sa.sa_handler; /* what we enter NOW */
regs->srp = return_ip; /* what we enter LATER */
regs->r10 = sig; /* first argument is signo */
regs->r11 = (unsigned long) &frame->info; /* second argument is (siginfo_t *) */
regs->r12 = 0; /* third argument is unused */
/* actually move the usp to reflect the stacked frame */
wrusp((unsigned long)frame);
return;
give_sigsegv:
if (sig == SIGSEGV)
ka->sa.sa_handler = SIG_DFL;
force_sig(SIGSEGV, current);
}
/*
* OK, we're invoking a handler
*/
static inline void
handle_signal(int canrestart, unsigned long sig, struct k_sigaction *ka,
siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
{
/* Are we from a system call? */
if (canrestart) {
/* If so, check system call restarting.. */
switch (regs->r10) {
case -ERESTARTNOHAND:
/* ERESTARTNOHAND means that the syscall should only be
restarted if there was no handler for the signal, and since
we only get here if there is a handler, we dont restart */
regs->r10 = -EINTR;
break;
case -ERESTARTSYS:
/* ERESTARTSYS means to restart the syscall if there is no
handler or the handler was registered with SA_RESTART */
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->r10 = -EINTR;
break;
}
/* fallthrough */
case -ERESTARTNOINTR:
/* ERESTARTNOINTR means that the syscall should be called again
after the signal handler returns. */
RESTART_CRIS_SYS(regs);
}
}
/* 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);
if (ka->sa.sa_flags & SA_ONESHOT)
ka->sa.sa_handler = SIG_DFL;
if (!(ka->sa.sa_flags & SA_NODEFER)) {
spin_lock_irq(¤t->sigmask_lock);
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
sigaddset(¤t->blocked,sig);
recalc_sigpending(current);
spin_unlock_irq(¤t->sigmask_lock);
}
}
/*
* 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.
*
* Also note that the regs structure given here as an argument, is the latest
* pushed pt_regs. It may or may not be the same as the first pushed registers
* when the initial usermode->kernelmode transition took place. Therefore
* we can use user_mode(regs) to see if we came directly from kernel or user
* mode below.
*/
int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs)
{
siginfo_t info;
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 (!user_mode(regs))
return 1;
if (!oldset)
oldset = ¤t->blocked;
for (;;) {
unsigned long signr;
spin_lock_irq(¤t->sigmask_lock);
signr = dequeue_signal(¤t->blocked, &info);
spin_unlock_irq(¤t->sigmask_lock);
if (!signr)
break;
if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
/* Let the debugger run. */
current->exit_code = signr;
current->state = TASK_STOPPED;
notify_parent(current, SIGCHLD);
schedule();
/* We're back. Did the debugger cancel the sig? */
if (!(signr = current->exit_code))
continue;
current->exit_code = 0;
/* The debugger continued. Ignore SIGSTOP. */
if (signr == SIGSTOP)
continue;
/* Update the siginfo structure. Is this good? */
if (signr != info.si_signo) {
info.si_signo = signr;
info.si_errno = 0;
info.si_code = SI_USER;
info.si_pid = current->p_pptr->pid;
info.si_uid = current->p_pptr->uid;
}
/* If the (new) signal is now blocked, requeue it. */
if (sigismember(¤t->blocked, signr)) {
send_sig_info(signr, &info, current);
continue;
}
}
ka = ¤t->sig->action[signr-1];
if (ka->sa.sa_handler == SIG_IGN) {
if (signr != SIGCHLD)
continue;
/* Check for SIGCHLD: it's special. */
while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
/* nothing */;
continue;
}
if (ka->sa.sa_handler == SIG_DFL) {
int exit_code = signr;
/* Init gets no signals it doesn't want. */
if (current->pid == 1)
continue;
switch (signr) {
case SIGCONT: case SIGCHLD: case SIGWINCH:
continue;
case SIGTSTP: case SIGTTIN: case SIGTTOU:
if (is_orphaned_pgrp(current->pgrp))
continue;
/* FALLTHRU */
case SIGSTOP:
current->state = TASK_STOPPED;
current->exit_code = signr;
if (!(current->p_pptr->sig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDSTOP))
notify_parent(current, SIGCHLD);
schedule();
continue;
case SIGQUIT: case SIGILL: case SIGTRAP:
case SIGABRT: case SIGFPE: case SIGSEGV:
case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:
if (do_coredump(signr, regs))
exit_code |= 0x80;
/* FALLTHRU */
default:
lock_kernel();
sigaddset(¤t->pending.signal, signr);
recalc_sigpending(current);
current->flags |= PF_SIGNALED;
do_exit(exit_code);
/* NOTREACHED */
}
}
/* Whee! Actually deliver the signal. */
handle_signal(canrestart, signr, ka, &info, oldset, regs);
return 1;
}
/* Did we come from a system call? */
if (canrestart) {
/* Restart the system call - no handlers present */
if (regs->r10 == -ERESTARTNOHAND ||
regs->r10 == -ERESTARTSYS ||
regs->r10 == -ERESTARTNOINTR) {
RESTART_CRIS_SYS(regs);
}
}
return 0;
}
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