a748102430
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
398 lines
9.2 KiB
C
398 lines
9.2 KiB
C
/*
|
|
* linux/arch/m32r/kernel/signal.c
|
|
*
|
|
* Copyright (c) 2003 Hitoshi Yamamoto
|
|
*
|
|
* Taken from i386 version.
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*
|
|
* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
|
|
* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/personality.h>
|
|
#include <linux/freezer.h>
|
|
#include <linux/tracehook.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/ucontext.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#define DEBUG_SIG 0
|
|
|
|
asmlinkage int
|
|
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
|
|
unsigned long r2, unsigned long r3, unsigned long r4,
|
|
unsigned long r5, unsigned long r6, struct pt_regs *regs)
|
|
{
|
|
return do_sigaltstack(uss, uoss, regs->spu);
|
|
}
|
|
|
|
|
|
/*
|
|
* Do a signal return; undo the signal stack.
|
|
*/
|
|
|
|
struct rt_sigframe
|
|
{
|
|
int sig;
|
|
struct siginfo __user *pinfo;
|
|
void __user *puc;
|
|
struct siginfo info;
|
|
struct ucontext uc;
|
|
// struct _fpstate fpstate;
|
|
};
|
|
|
|
static int
|
|
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
|
|
int *r0_p)
|
|
{
|
|
unsigned int err = 0;
|
|
|
|
/* Always make any pending restarted system calls return -EINTR */
|
|
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
|
|
|
#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
|
|
COPY(r4);
|
|
COPY(r5);
|
|
COPY(r6);
|
|
COPY(pt_regs);
|
|
/* COPY(r0); Skip r0 */
|
|
COPY(r1);
|
|
COPY(r2);
|
|
COPY(r3);
|
|
COPY(r7);
|
|
COPY(r8);
|
|
COPY(r9);
|
|
COPY(r10);
|
|
COPY(r11);
|
|
COPY(r12);
|
|
COPY(acc0h);
|
|
COPY(acc0l);
|
|
COPY(acc1h); /* ISA_DSP_LEVEL2 only */
|
|
COPY(acc1l); /* ISA_DSP_LEVEL2 only */
|
|
COPY(psw);
|
|
COPY(bpc);
|
|
COPY(bbpsw);
|
|
COPY(bbpc);
|
|
COPY(spu);
|
|
COPY(fp);
|
|
COPY(lr);
|
|
COPY(spi);
|
|
#undef COPY
|
|
|
|
regs->syscall_nr = -1; /* disable syscall checks */
|
|
err |= __get_user(*r0_p, &sc->sc_r0);
|
|
|
|
return err;
|
|
}
|
|
|
|
asmlinkage int
|
|
sys_rt_sigreturn(unsigned long r0, unsigned long r1,
|
|
unsigned long r2, unsigned long r3, unsigned long r4,
|
|
unsigned long r5, unsigned long r6, struct pt_regs *regs)
|
|
{
|
|
struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
|
|
sigset_t set;
|
|
int result;
|
|
|
|
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_lock_irq(¤t->sighand->siglock);
|
|
current->blocked = set;
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
|
|
if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
|
|
goto badframe;
|
|
|
|
if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
|
|
goto badframe;
|
|
|
|
return result;
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set up a signal frame.
|
|
*/
|
|
|
|
static int
|
|
setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
|
|
unsigned long mask)
|
|
{
|
|
int err = 0;
|
|
|
|
#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
|
|
COPY(r4);
|
|
COPY(r5);
|
|
COPY(r6);
|
|
COPY(pt_regs);
|
|
COPY(r0);
|
|
COPY(r1);
|
|
COPY(r2);
|
|
COPY(r3);
|
|
COPY(r7);
|
|
COPY(r8);
|
|
COPY(r9);
|
|
COPY(r10);
|
|
COPY(r11);
|
|
COPY(r12);
|
|
COPY(acc0h);
|
|
COPY(acc0l);
|
|
COPY(acc1h); /* ISA_DSP_LEVEL2 only */
|
|
COPY(acc1l); /* ISA_DSP_LEVEL2 only */
|
|
COPY(psw);
|
|
COPY(bpc);
|
|
COPY(bbpsw);
|
|
COPY(bbpc);
|
|
COPY(spu);
|
|
COPY(fp);
|
|
COPY(lr);
|
|
COPY(spi);
|
|
#undef COPY
|
|
|
|
err |= __put_user(mask, &sc->oldmask);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Determine which stack to use..
|
|
*/
|
|
static inline void __user *
|
|
get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
|
|
{
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
|
if (ka->sa.sa_flags & SA_ONSTACK) {
|
|
if (sas_ss_flags(sp) == 0)
|
|
sp = current->sas_ss_sp + current->sas_ss_size;
|
|
}
|
|
|
|
return (void __user *)((sp - frame_size) & -8ul);
|
|
}
|
|
|
|
static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
sigset_t *set, struct pt_regs *regs)
|
|
{
|
|
struct rt_sigframe __user *frame;
|
|
int err = 0;
|
|
int signal;
|
|
|
|
frame = get_sigframe(ka, regs->spu, sizeof(*frame));
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
goto give_sigsegv;
|
|
|
|
signal = 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(signal, &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(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
|
err |= __put_user(sas_ss_flags(regs->spu),
|
|
&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. */
|
|
regs->lr = (unsigned long)ka->sa.sa_restorer;
|
|
|
|
/* Set up registers for signal handler */
|
|
regs->spu = (unsigned long)frame;
|
|
regs->r0 = signal; /* Arg for signal handler */
|
|
regs->r1 = (unsigned long)&frame->info;
|
|
regs->r2 = (unsigned long)&frame->uc;
|
|
regs->bpc = (unsigned long)ka->sa.sa_handler;
|
|
|
|
set_fs(USER_DS);
|
|
|
|
#if DEBUG_SIG
|
|
printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
|
|
current->comm, current->pid, frame, regs->pc);
|
|
#endif
|
|
|
|
return;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(sig, current);
|
|
}
|
|
|
|
/*
|
|
* OK, we're invoking a handler
|
|
*/
|
|
|
|
static void
|
|
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
|
|
sigset_t *oldset, struct pt_regs *regs)
|
|
{
|
|
unsigned short inst;
|
|
|
|
/* Are we from a system call? */
|
|
if (regs->syscall_nr >= 0) {
|
|
/* If so, check system call restarting.. */
|
|
switch (regs->r0) {
|
|
case -ERESTART_RESTARTBLOCK:
|
|
case -ERESTARTNOHAND:
|
|
regs->r0 = -EINTR;
|
|
break;
|
|
|
|
case -ERESTARTSYS:
|
|
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
|
regs->r0 = -EINTR;
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
case -ERESTARTNOINTR:
|
|
regs->r0 = regs->orig_r0;
|
|
inst = *(unsigned short *)(regs->bpc - 2);
|
|
if ((inst & 0xfff0) == 0x10f0) /* trap ? */
|
|
regs->bpc -= 2;
|
|
else
|
|
regs->bpc -= 4;
|
|
regs->syscall_nr = -1;
|
|
}
|
|
}
|
|
|
|
/* Set up the stack frame */
|
|
setup_rt_frame(sig, ka, info, 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.
|
|
*/
|
|
static int do_signal(struct pt_regs *regs)
|
|
{
|
|
siginfo_t info;
|
|
int signr;
|
|
struct k_sigaction ka;
|
|
unsigned short inst;
|
|
sigset_t *oldset;
|
|
|
|
/*
|
|
* 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 (try_to_freeze())
|
|
goto no_signal;
|
|
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK))
|
|
oldset = ¤t->saved_sigmask;
|
|
else
|
|
oldset = ¤t->blocked;
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
if (signr > 0) {
|
|
/* Re-enable any watchpoints before delivering the
|
|
* signal to user space. The processor register will
|
|
* have been cleared if the watchpoint triggered
|
|
* inside the kernel.
|
|
*/
|
|
|
|
/* Whee! Actually deliver the signal. */
|
|
handle_signal(signr, &ka, &info, oldset, regs);
|
|
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
|
return 1;
|
|
}
|
|
|
|
no_signal:
|
|
/* Did we come from a system call? */
|
|
if (regs->syscall_nr >= 0) {
|
|
/* Restart the system call - no handlers present */
|
|
if (regs->r0 == -ERESTARTNOHAND ||
|
|
regs->r0 == -ERESTARTSYS ||
|
|
regs->r0 == -ERESTARTNOINTR) {
|
|
regs->r0 = regs->orig_r0;
|
|
inst = *(unsigned short *)(regs->bpc - 2);
|
|
if ((inst & 0xfff0) == 0x10f0) /* trap ? */
|
|
regs->bpc -= 2;
|
|
else
|
|
regs->bpc -= 4;
|
|
regs->syscall_nr = -1;
|
|
} else if (regs->r0 == -ERESTART_RESTARTBLOCK){
|
|
regs->r0 = regs->orig_r0;
|
|
regs->r7 = __NR_restart_syscall;
|
|
inst = *(unsigned short *)(regs->bpc - 2);
|
|
if ((inst & 0xfff0) == 0x10f0) /* trap ? */
|
|
regs->bpc -= 2;
|
|
else
|
|
regs->bpc -= 4;
|
|
regs->syscall_nr = -1;
|
|
}
|
|
}
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
|
|
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
|
sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* notification of userspace execution resumption
|
|
* - triggered by current->work.notify_resume
|
|
*/
|
|
void do_notify_resume(struct pt_regs *regs, __u32 thread_info_flags)
|
|
{
|
|
/* Pending single-step? */
|
|
if (thread_info_flags & _TIF_SINGLESTEP)
|
|
clear_thread_flag(TIF_SINGLESTEP);
|
|
|
|
/* deal with pending signal delivery */
|
|
if (thread_info_flags & _TIF_SIGPENDING)
|
|
do_signal(regs);
|
|
|
|
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();
|
|
}
|
|
|
|
clear_thread_flag(TIF_IRET);
|
|
}
|