mirror of https://gitee.com/openkylin/linux.git
1048 lines
28 KiB
C
1048 lines
28 KiB
C
/*
|
|
* linux/arch/m68k/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.
|
|
*/
|
|
|
|
/*
|
|
* Linux/m68k support by Hamish Macdonald
|
|
*
|
|
* 68060 fixes by Jesper Skov
|
|
*
|
|
* 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
|
|
*
|
|
* mathemu support by Roman Zippel
|
|
* (Note: fpstate in the signal context is completely ignored for the emulator
|
|
* and the internal floating point format is put on stack)
|
|
*/
|
|
|
|
/*
|
|
* ++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 <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(sigset_t *oldset, struct pt_regs *regs);
|
|
|
|
const int frame_extra_sizes[16] = {
|
|
[1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
|
|
[2] = sizeof(((struct frame *)0)->un.fmt2),
|
|
[3] = sizeof(((struct frame *)0)->un.fmt3),
|
|
[4] = sizeof(((struct frame *)0)->un.fmt4),
|
|
[5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
|
|
[6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
|
|
[7] = sizeof(((struct frame *)0)->un.fmt7),
|
|
[8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */
|
|
[9] = sizeof(((struct frame *)0)->un.fmt9),
|
|
[10] = sizeof(((struct frame *)0)->un.fmta),
|
|
[11] = sizeof(((struct frame *)0)->un.fmtb),
|
|
[12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */
|
|
[13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */
|
|
[14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */
|
|
[15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
|
|
};
|
|
|
|
/*
|
|
* 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->d3;
|
|
sigset_t saveset;
|
|
|
|
mask &= _BLOCKABLE;
|
|
saveset = current->blocked;
|
|
siginitset(¤t->blocked, mask);
|
|
recalc_sigpending();
|
|
|
|
regs->d0 = -EINTR;
|
|
while (1) {
|
|
current->state = TASK_INTERRUPTIBLE;
|
|
schedule();
|
|
if (do_signal(&saveset, regs))
|
|
return -EINTR;
|
|
}
|
|
}
|
|
|
|
asmlinkage int
|
|
do_rt_sigsuspend(struct pt_regs *regs)
|
|
{
|
|
sigset_t __user *unewset = (sigset_t __user *)regs->d1;
|
|
size_t sigsetsize = (size_t)regs->d2;
|
|
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);
|
|
|
|
saveset = current->blocked;
|
|
current->blocked = newset;
|
|
recalc_sigpending();
|
|
|
|
regs->d0 = -EINTR;
|
|
while (1) {
|
|
current->state = TASK_INTERRUPTIBLE;
|
|
schedule();
|
|
if (do_signal(&saveset, regs))
|
|
return -EINTR;
|
|
}
|
|
}
|
|
|
|
asmlinkage int
|
|
sys_sigaction(int sig, const struct old_sigaction __user *act,
|
|
struct old_sigaction __user *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 __user *uss, stack_t __user *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
|
|
{
|
|
char __user *pretcode;
|
|
int sig;
|
|
int code;
|
|
struct sigcontext __user *psc;
|
|
char retcode[8];
|
|
unsigned long extramask[_NSIG_WORDS-1];
|
|
struct sigcontext sc;
|
|
};
|
|
|
|
struct rt_sigframe
|
|
{
|
|
char __user *pretcode;
|
|
int sig;
|
|
struct siginfo __user *pinfo;
|
|
void __user *puc;
|
|
char retcode[8];
|
|
struct siginfo info;
|
|
struct ucontext uc;
|
|
};
|
|
|
|
|
|
static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
|
|
|
|
static inline int restore_fpu_state(struct sigcontext *sc)
|
|
{
|
|
int err = 1;
|
|
|
|
if (FPU_IS_EMU) {
|
|
/* restore registers */
|
|
memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
|
|
memcpy(current->thread.fp, sc->sc_fpregs, 24);
|
|
return 0;
|
|
}
|
|
|
|
if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
|
|
/* Verify the frame format. */
|
|
if (!CPU_IS_060 && (sc->sc_fpstate[0] != fpu_version))
|
|
goto out;
|
|
if (CPU_IS_020_OR_030) {
|
|
if (m68k_fputype & FPU_68881 &&
|
|
!(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
|
|
goto out;
|
|
if (m68k_fputype & FPU_68882 &&
|
|
!(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
|
|
goto out;
|
|
} else if (CPU_IS_040) {
|
|
if (!(sc->sc_fpstate[1] == 0x00 ||
|
|
sc->sc_fpstate[1] == 0x28 ||
|
|
sc->sc_fpstate[1] == 0x60))
|
|
goto out;
|
|
} else if (CPU_IS_060) {
|
|
if (!(sc->sc_fpstate[3] == 0x00 ||
|
|
sc->sc_fpstate[3] == 0x60 ||
|
|
sc->sc_fpstate[3] == 0xe0))
|
|
goto out;
|
|
} else
|
|
goto out;
|
|
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fmovemx %0,%%fp0-%%fp1\n\t"
|
|
"fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
|
|
".chip 68k"
|
|
: /* no outputs */
|
|
: "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl));
|
|
}
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"frestore %0\n\t"
|
|
".chip 68k" : : "m" (*sc->sc_fpstate));
|
|
err = 0;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
#define FPCONTEXT_SIZE 216
|
|
#define uc_fpstate uc_filler[0]
|
|
#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
|
|
#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
|
|
|
|
static inline int rt_restore_fpu_state(struct ucontext __user *uc)
|
|
{
|
|
unsigned char fpstate[FPCONTEXT_SIZE];
|
|
int context_size = CPU_IS_060 ? 8 : 0;
|
|
fpregset_t fpregs;
|
|
int err = 1;
|
|
|
|
if (FPU_IS_EMU) {
|
|
/* restore fpu control register */
|
|
if (__copy_from_user(current->thread.fpcntl,
|
|
uc->uc_mcontext.fpregs.f_fpcntl, 12))
|
|
goto out;
|
|
/* restore all other fpu register */
|
|
if (__copy_from_user(current->thread.fp,
|
|
uc->uc_mcontext.fpregs.f_fpregs, 96))
|
|
goto out;
|
|
return 0;
|
|
}
|
|
|
|
if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
|
|
goto out;
|
|
if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
|
|
if (!CPU_IS_060)
|
|
context_size = fpstate[1];
|
|
/* Verify the frame format. */
|
|
if (!CPU_IS_060 && (fpstate[0] != fpu_version))
|
|
goto out;
|
|
if (CPU_IS_020_OR_030) {
|
|
if (m68k_fputype & FPU_68881 &&
|
|
!(context_size == 0x18 || context_size == 0xb4))
|
|
goto out;
|
|
if (m68k_fputype & FPU_68882 &&
|
|
!(context_size == 0x38 || context_size == 0xd4))
|
|
goto out;
|
|
} else if (CPU_IS_040) {
|
|
if (!(context_size == 0x00 ||
|
|
context_size == 0x28 ||
|
|
context_size == 0x60))
|
|
goto out;
|
|
} else if (CPU_IS_060) {
|
|
if (!(fpstate[3] == 0x00 ||
|
|
fpstate[3] == 0x60 ||
|
|
fpstate[3] == 0xe0))
|
|
goto out;
|
|
} else
|
|
goto out;
|
|
if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
|
|
sizeof(fpregs)))
|
|
goto out;
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fmovemx %0,%%fp0-%%fp7\n\t"
|
|
"fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
|
|
".chip 68k"
|
|
: /* no outputs */
|
|
: "m" (*fpregs.f_fpregs),
|
|
"m" (*fpregs.f_fpcntl));
|
|
}
|
|
if (context_size &&
|
|
__copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
|
|
context_size))
|
|
goto out;
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"frestore %0\n\t"
|
|
".chip 68k" : : "m" (*fpstate));
|
|
err = 0;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static inline int
|
|
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp,
|
|
int *pd0)
|
|
{
|
|
int fsize, formatvec;
|
|
struct sigcontext context;
|
|
int err;
|
|
|
|
/* Always make any pending restarted system calls return -EINTR */
|
|
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
|
|
|
/* get previous context */
|
|
if (copy_from_user(&context, usc, sizeof(context)))
|
|
goto badframe;
|
|
|
|
/* restore passed registers */
|
|
regs->d1 = context.sc_d1;
|
|
regs->a0 = context.sc_a0;
|
|
regs->a1 = context.sc_a1;
|
|
regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
|
|
regs->pc = context.sc_pc;
|
|
regs->orig_d0 = -1; /* disable syscall checks */
|
|
wrusp(context.sc_usp);
|
|
formatvec = context.sc_formatvec;
|
|
regs->format = formatvec >> 12;
|
|
regs->vector = formatvec & 0xfff;
|
|
|
|
err = restore_fpu_state(&context);
|
|
|
|
fsize = frame_extra_sizes[regs->format];
|
|
if (fsize < 0) {
|
|
/*
|
|
* user process trying to return with weird frame format
|
|
*/
|
|
#ifdef DEBUG
|
|
printk("user process returning with weird frame format\n");
|
|
#endif
|
|
goto badframe;
|
|
}
|
|
|
|
/* OK. Make room on the supervisor stack for the extra junk,
|
|
* if necessary.
|
|
*/
|
|
|
|
if (fsize) {
|
|
struct switch_stack *sw = (struct switch_stack *)regs - 1;
|
|
regs->d0 = context.sc_d0;
|
|
#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
|
|
__asm__ __volatile__
|
|
(" movel %0,%/a0\n\t"
|
|
" subl %1,%/a0\n\t" /* make room on stack */
|
|
" movel %/a0,%/sp\n\t" /* set stack pointer */
|
|
/* move switch_stack and pt_regs */
|
|
"1: movel %0@+,%/a0@+\n\t"
|
|
" dbra %2,1b\n\t"
|
|
" lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
|
|
" lsrl #2,%1\n\t"
|
|
" subql #1,%1\n\t"
|
|
"2: movesl %4@+,%2\n\t"
|
|
"3: movel %2,%/a0@+\n\t"
|
|
" dbra %1,2b\n\t"
|
|
" bral ret_from_signal\n"
|
|
"4:\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 2b,4b\n"
|
|
" .long 3b,4b\n"
|
|
".previous"
|
|
: /* no outputs, it doesn't ever return */
|
|
: "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
|
|
"n" (frame_offset), "a" (fp)
|
|
: "a0");
|
|
#undef frame_offset
|
|
/*
|
|
* If we ever get here an exception occurred while
|
|
* building the above stack-frame.
|
|
*/
|
|
goto badframe;
|
|
}
|
|
|
|
*pd0 = context.sc_d0;
|
|
return err;
|
|
|
|
badframe:
|
|
return 1;
|
|
}
|
|
|
|
static inline int
|
|
rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
|
|
struct ucontext __user *uc, int *pd0)
|
|
{
|
|
int fsize, temp;
|
|
greg_t __user *gregs = uc->uc_mcontext.gregs;
|
|
unsigned long usp;
|
|
int err;
|
|
|
|
/* Always make any pending restarted system calls return -EINTR */
|
|
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
|
|
|
err = __get_user(temp, &uc->uc_mcontext.version);
|
|
if (temp != MCONTEXT_VERSION)
|
|
goto badframe;
|
|
/* restore passed registers */
|
|
err |= __get_user(regs->d0, &gregs[0]);
|
|
err |= __get_user(regs->d1, &gregs[1]);
|
|
err |= __get_user(regs->d2, &gregs[2]);
|
|
err |= __get_user(regs->d3, &gregs[3]);
|
|
err |= __get_user(regs->d4, &gregs[4]);
|
|
err |= __get_user(regs->d5, &gregs[5]);
|
|
err |= __get_user(sw->d6, &gregs[6]);
|
|
err |= __get_user(sw->d7, &gregs[7]);
|
|
err |= __get_user(regs->a0, &gregs[8]);
|
|
err |= __get_user(regs->a1, &gregs[9]);
|
|
err |= __get_user(regs->a2, &gregs[10]);
|
|
err |= __get_user(sw->a3, &gregs[11]);
|
|
err |= __get_user(sw->a4, &gregs[12]);
|
|
err |= __get_user(sw->a5, &gregs[13]);
|
|
err |= __get_user(sw->a6, &gregs[14]);
|
|
err |= __get_user(usp, &gregs[15]);
|
|
wrusp(usp);
|
|
err |= __get_user(regs->pc, &gregs[16]);
|
|
err |= __get_user(temp, &gregs[17]);
|
|
regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
|
|
regs->orig_d0 = -1; /* disable syscall checks */
|
|
err |= __get_user(temp, &uc->uc_formatvec);
|
|
regs->format = temp >> 12;
|
|
regs->vector = temp & 0xfff;
|
|
|
|
err |= rt_restore_fpu_state(uc);
|
|
|
|
if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
|
|
goto badframe;
|
|
|
|
fsize = frame_extra_sizes[regs->format];
|
|
if (fsize < 0) {
|
|
/*
|
|
* user process trying to return with weird frame format
|
|
*/
|
|
#ifdef DEBUG
|
|
printk("user process returning with weird frame format\n");
|
|
#endif
|
|
goto badframe;
|
|
}
|
|
|
|
/* OK. Make room on the supervisor stack for the extra junk,
|
|
* if necessary.
|
|
*/
|
|
|
|
if (fsize) {
|
|
#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
|
|
__asm__ __volatile__
|
|
(" movel %0,%/a0\n\t"
|
|
" subl %1,%/a0\n\t" /* make room on stack */
|
|
" movel %/a0,%/sp\n\t" /* set stack pointer */
|
|
/* move switch_stack and pt_regs */
|
|
"1: movel %0@+,%/a0@+\n\t"
|
|
" dbra %2,1b\n\t"
|
|
" lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
|
|
" lsrl #2,%1\n\t"
|
|
" subql #1,%1\n\t"
|
|
"2: movesl %4@+,%2\n\t"
|
|
"3: movel %2,%/a0@+\n\t"
|
|
" dbra %1,2b\n\t"
|
|
" bral ret_from_signal\n"
|
|
"4:\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 2b,4b\n"
|
|
" .long 3b,4b\n"
|
|
".previous"
|
|
: /* no outputs, it doesn't ever return */
|
|
: "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
|
|
"n" (frame_offset), "a" (&uc->uc_extra)
|
|
: "a0");
|
|
#undef frame_offset
|
|
/*
|
|
* If we ever get here an exception occurred while
|
|
* building the above stack-frame.
|
|
*/
|
|
goto badframe;
|
|
}
|
|
|
|
*pd0 = regs->d0;
|
|
return err;
|
|
|
|
badframe:
|
|
return 1;
|
|
}
|
|
|
|
asmlinkage int do_sigreturn(unsigned long __unused)
|
|
{
|
|
struct switch_stack *sw = (struct switch_stack *) &__unused;
|
|
struct pt_regs *regs = (struct pt_regs *) (sw + 1);
|
|
unsigned long usp = rdusp();
|
|
struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
|
|
sigset_t set;
|
|
int d0;
|
|
|
|
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);
|
|
current->blocked = set;
|
|
recalc_sigpending();
|
|
|
|
if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0))
|
|
goto badframe;
|
|
return d0;
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage int do_rt_sigreturn(unsigned long __unused)
|
|
{
|
|
struct switch_stack *sw = (struct switch_stack *) &__unused;
|
|
struct pt_regs *regs = (struct pt_regs *) (sw + 1);
|
|
unsigned long usp = rdusp();
|
|
struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
|
|
sigset_t set;
|
|
int d0;
|
|
|
|
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);
|
|
current->blocked = set;
|
|
recalc_sigpending();
|
|
|
|
if (rt_restore_ucontext(regs, sw, &frame->uc, &d0))
|
|
goto badframe;
|
|
return d0;
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set up a signal frame.
|
|
*/
|
|
|
|
static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
|
|
{
|
|
if (FPU_IS_EMU) {
|
|
/* save registers */
|
|
memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
|
|
memcpy(sc->sc_fpregs, current->thread.fp, 24);
|
|
return;
|
|
}
|
|
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fsave %0\n\t"
|
|
".chip 68k"
|
|
: : "m" (*sc->sc_fpstate) : "memory");
|
|
|
|
if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
|
|
fpu_version = sc->sc_fpstate[0];
|
|
if (CPU_IS_020_OR_030 &&
|
|
regs->vector >= (VEC_FPBRUC * 4) &&
|
|
regs->vector <= (VEC_FPNAN * 4)) {
|
|
/* Clear pending exception in 68882 idle frame */
|
|
if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
|
|
sc->sc_fpstate[0x38] |= 1 << 3;
|
|
}
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fmovemx %%fp0-%%fp1,%0\n\t"
|
|
"fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
|
|
".chip 68k"
|
|
: "=m" (*sc->sc_fpregs),
|
|
"=m" (*sc->sc_fpcntl)
|
|
: /* no inputs */
|
|
: "memory");
|
|
}
|
|
}
|
|
|
|
static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
|
|
{
|
|
unsigned char fpstate[FPCONTEXT_SIZE];
|
|
int context_size = CPU_IS_060 ? 8 : 0;
|
|
int err = 0;
|
|
|
|
if (FPU_IS_EMU) {
|
|
/* save fpu control register */
|
|
err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
|
|
current->thread.fpcntl, 12);
|
|
/* save all other fpu register */
|
|
err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
|
|
current->thread.fp, 96);
|
|
return err;
|
|
}
|
|
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fsave %0\n\t"
|
|
".chip 68k"
|
|
: : "m" (*fpstate) : "memory");
|
|
|
|
err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
|
|
if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
|
|
fpregset_t fpregs;
|
|
if (!CPU_IS_060)
|
|
context_size = fpstate[1];
|
|
fpu_version = fpstate[0];
|
|
if (CPU_IS_020_OR_030 &&
|
|
regs->vector >= (VEC_FPBRUC * 4) &&
|
|
regs->vector <= (VEC_FPNAN * 4)) {
|
|
/* Clear pending exception in 68882 idle frame */
|
|
if (*(unsigned short *) fpstate == 0x1f38)
|
|
fpstate[0x38] |= 1 << 3;
|
|
}
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fmovemx %%fp0-%%fp7,%0\n\t"
|
|
"fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
|
|
".chip 68k"
|
|
: "=m" (*fpregs.f_fpregs),
|
|
"=m" (*fpregs.f_fpcntl)
|
|
: /* no inputs */
|
|
: "memory");
|
|
err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
|
|
sizeof(fpregs));
|
|
}
|
|
if (context_size)
|
|
err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
|
|
context_size);
|
|
return err;
|
|
}
|
|
|
|
static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
|
|
unsigned long mask)
|
|
{
|
|
sc->sc_mask = mask;
|
|
sc->sc_usp = rdusp();
|
|
sc->sc_d0 = regs->d0;
|
|
sc->sc_d1 = regs->d1;
|
|
sc->sc_a0 = regs->a0;
|
|
sc->sc_a1 = regs->a1;
|
|
sc->sc_sr = regs->sr;
|
|
sc->sc_pc = regs->pc;
|
|
sc->sc_formatvec = regs->format << 12 | regs->vector;
|
|
save_fpu_state(sc, regs);
|
|
}
|
|
|
|
static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
|
|
{
|
|
struct switch_stack *sw = (struct switch_stack *)regs - 1;
|
|
greg_t __user *gregs = uc->uc_mcontext.gregs;
|
|
int err = 0;
|
|
|
|
err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
|
|
err |= __put_user(regs->d0, &gregs[0]);
|
|
err |= __put_user(regs->d1, &gregs[1]);
|
|
err |= __put_user(regs->d2, &gregs[2]);
|
|
err |= __put_user(regs->d3, &gregs[3]);
|
|
err |= __put_user(regs->d4, &gregs[4]);
|
|
err |= __put_user(regs->d5, &gregs[5]);
|
|
err |= __put_user(sw->d6, &gregs[6]);
|
|
err |= __put_user(sw->d7, &gregs[7]);
|
|
err |= __put_user(regs->a0, &gregs[8]);
|
|
err |= __put_user(regs->a1, &gregs[9]);
|
|
err |= __put_user(regs->a2, &gregs[10]);
|
|
err |= __put_user(sw->a3, &gregs[11]);
|
|
err |= __put_user(sw->a4, &gregs[12]);
|
|
err |= __put_user(sw->a5, &gregs[13]);
|
|
err |= __put_user(sw->a6, &gregs[14]);
|
|
err |= __put_user(rdusp(), &gregs[15]);
|
|
err |= __put_user(regs->pc, &gregs[16]);
|
|
err |= __put_user(regs->sr, &gregs[17]);
|
|
err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
|
|
err |= rt_save_fpu_state(uc, regs);
|
|
return err;
|
|
}
|
|
|
|
static inline void push_cache (unsigned long vaddr)
|
|
{
|
|
/*
|
|
* Using the old cache_push_v() was really a big waste.
|
|
*
|
|
* What we are trying to do is to flush 8 bytes to ram.
|
|
* Flushing 2 cache lines of 16 bytes is much cheaper than
|
|
* flushing 1 or 2 pages, as previously done in
|
|
* cache_push_v().
|
|
* Jes
|
|
*/
|
|
if (CPU_IS_040) {
|
|
unsigned long temp;
|
|
|
|
__asm__ __volatile__ (".chip 68040\n\t"
|
|
"nop\n\t"
|
|
"ptestr (%1)\n\t"
|
|
"movec %%mmusr,%0\n\t"
|
|
".chip 68k"
|
|
: "=r" (temp)
|
|
: "a" (vaddr));
|
|
|
|
temp &= PAGE_MASK;
|
|
temp |= vaddr & ~PAGE_MASK;
|
|
|
|
__asm__ __volatile__ (".chip 68040\n\t"
|
|
"nop\n\t"
|
|
"cpushl %%bc,(%0)\n\t"
|
|
".chip 68k"
|
|
: : "a" (temp));
|
|
}
|
|
else if (CPU_IS_060) {
|
|
unsigned long temp;
|
|
__asm__ __volatile__ (".chip 68060\n\t"
|
|
"plpar (%0)\n\t"
|
|
".chip 68k"
|
|
: "=a" (temp)
|
|
: "0" (vaddr));
|
|
__asm__ __volatile__ (".chip 68060\n\t"
|
|
"cpushl %%bc,(%0)\n\t"
|
|
".chip 68k"
|
|
: : "a" (temp));
|
|
}
|
|
else {
|
|
/*
|
|
* 68030/68020 have no writeback cache;
|
|
* still need to clear icache.
|
|
* Note that vaddr is guaranteed to be long word aligned.
|
|
*/
|
|
unsigned long temp;
|
|
asm volatile ("movec %%cacr,%0" : "=r" (temp));
|
|
temp += 4;
|
|
asm volatile ("movec %0,%%caar\n\t"
|
|
"movec %1,%%cacr"
|
|
: : "r" (vaddr), "r" (temp));
|
|
asm volatile ("movec %0,%%caar\n\t"
|
|
"movec %1,%%cacr"
|
|
: : "r" (vaddr + 4), "r" (temp));
|
|
}
|
|
}
|
|
|
|
static inline void __user *
|
|
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 __user *)((usp - frame_size) & -8UL);
|
|
}
|
|
|
|
static void setup_frame (int sig, struct k_sigaction *ka,
|
|
sigset_t *set, struct pt_regs *regs)
|
|
{
|
|
struct sigframe __user *frame;
|
|
int fsize = frame_extra_sizes[regs->format];
|
|
struct sigcontext context;
|
|
int err = 0;
|
|
|
|
if (fsize < 0) {
|
|
#ifdef DEBUG
|
|
printk ("setup_frame: Unknown frame format %#x\n",
|
|
regs->format);
|
|
#endif
|
|
goto give_sigsegv;
|
|
}
|
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
|
|
|
|
if (fsize) {
|
|
err |= copy_to_user (frame + 1, regs + 1, fsize);
|
|
regs->stkadj = fsize;
|
|
}
|
|
|
|
err |= __put_user((current_thread_info()->exec_domain
|
|
&& current_thread_info()->exec_domain->signal_invmap
|
|
&& sig < 32
|
|
? current_thread_info()->exec_domain->signal_invmap[sig]
|
|
: sig),
|
|
&frame->sig);
|
|
|
|
err |= __put_user(regs->vector, &frame->code);
|
|
err |= __put_user(&frame->sc, &frame->psc);
|
|
|
|
if (_NSIG_WORDS > 1)
|
|
err |= copy_to_user(frame->extramask, &set->sig[1],
|
|
sizeof(frame->extramask));
|
|
|
|
setup_sigcontext(&context, regs, set->sig[0]);
|
|
err |= copy_to_user (&frame->sc, &context, sizeof(context));
|
|
|
|
/* Set up to return from userspace. */
|
|
err |= __put_user(frame->retcode, &frame->pretcode);
|
|
/* moveq #,d0; trap #0 */
|
|
err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
|
|
(long __user *)(frame->retcode));
|
|
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
push_cache ((unsigned long) &frame->retcode);
|
|
|
|
/* Set up registers for signal handler */
|
|
wrusp ((unsigned long) frame);
|
|
regs->pc = (unsigned long) ka->sa.sa_handler;
|
|
|
|
adjust_stack:
|
|
/* Prepare to skip over the extra stuff in the exception frame. */
|
|
if (regs->stkadj) {
|
|
struct pt_regs *tregs =
|
|
(struct pt_regs *)((ulong)regs + regs->stkadj);
|
|
#ifdef DEBUG
|
|
printk("Performing stackadjust=%04x\n", regs->stkadj);
|
|
#endif
|
|
/* This must be copied with decreasing addresses to
|
|
handle overlaps. */
|
|
tregs->vector = 0;
|
|
tregs->format = 0;
|
|
tregs->pc = regs->pc;
|
|
tregs->sr = regs->sr;
|
|
}
|
|
return;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(sig, current);
|
|
goto adjust_stack;
|
|
}
|
|
|
|
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 fsize = frame_extra_sizes[regs->format];
|
|
int err = 0;
|
|
|
|
if (fsize < 0) {
|
|
#ifdef DEBUG
|
|
printk ("setup_frame: Unknown frame format %#x\n",
|
|
regs->format);
|
|
#endif
|
|
goto give_sigsegv;
|
|
}
|
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
|
|
if (fsize) {
|
|
err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
|
|
regs->stkadj = fsize;
|
|
}
|
|
|
|
err |= __put_user((current_thread_info()->exec_domain
|
|
&& current_thread_info()->exec_domain->signal_invmap
|
|
&& sig < 32
|
|
? current_thread_info()->exec_domain->signal_invmap[sig]
|
|
: sig),
|
|
&frame->sig);
|
|
err |= __put_user(&frame->info, &frame->pinfo);
|
|
err |= __put_user(&frame->uc, &frame->puc);
|
|
err |= copy_siginfo_to_user(&frame->info, info);
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->uc.uc_flags);
|
|
err |= __put_user(NULL, &frame->uc.uc_link);
|
|
err |= __put_user((void __user *)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 |= rt_setup_ucontext(&frame->uc, regs);
|
|
err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
|
|
/* Set up to return from userspace. */
|
|
err |= __put_user(frame->retcode, &frame->pretcode);
|
|
#ifdef __mcoldfire__
|
|
/* movel #__NR_rt_sigreturn,d0; trap #0 */
|
|
err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
|
|
err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
|
|
(long __user *)(frame->retcode + 4));
|
|
#else
|
|
/* moveq #,d0; notb d0; trap #0 */
|
|
err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
|
|
(long __user *)(frame->retcode + 0));
|
|
err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
|
|
#endif
|
|
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
push_cache ((unsigned long) &frame->retcode);
|
|
|
|
/* Set up registers for signal handler */
|
|
wrusp ((unsigned long) frame);
|
|
regs->pc = (unsigned long) ka->sa.sa_handler;
|
|
|
|
adjust_stack:
|
|
/* Prepare to skip over the extra stuff in the exception frame. */
|
|
if (regs->stkadj) {
|
|
struct pt_regs *tregs =
|
|
(struct pt_regs *)((ulong)regs + regs->stkadj);
|
|
#ifdef DEBUG
|
|
printk("Performing stackadjust=%04x\n", regs->stkadj);
|
|
#endif
|
|
/* This must be copied with decreasing addresses to
|
|
handle overlaps. */
|
|
tregs->vector = 0;
|
|
tregs->format = 0;
|
|
tregs->pc = regs->pc;
|
|
tregs->sr = regs->sr;
|
|
}
|
|
return;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(sig, current);
|
|
goto adjust_stack;
|
|
}
|
|
|
|
static inline void
|
|
handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
|
|
{
|
|
switch (regs->d0) {
|
|
case -ERESTARTNOHAND:
|
|
if (!has_handler)
|
|
goto do_restart;
|
|
regs->d0 = -EINTR;
|
|
break;
|
|
|
|
case -ERESTART_RESTARTBLOCK:
|
|
if (!has_handler) {
|
|
regs->d0 = __NR_restart_syscall;
|
|
regs->pc -= 2;
|
|
break;
|
|
}
|
|
regs->d0 = -EINTR;
|
|
break;
|
|
|
|
case -ERESTARTSYS:
|
|
if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
|
|
regs->d0 = -EINTR;
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
case -ERESTARTNOINTR:
|
|
do_restart:
|
|
regs->d0 = regs->orig_d0;
|
|
regs->pc -= 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
|
|
{
|
|
if (regs->orig_d0 < 0)
|
|
return;
|
|
switch (regs->d0) {
|
|
case -ERESTARTNOHAND:
|
|
case -ERESTARTSYS:
|
|
case -ERESTARTNOINTR:
|
|
regs->d0 = regs->orig_d0;
|
|
regs->orig_d0 = -1;
|
|
regs->pc -= 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* OK, we're invoking a handler
|
|
*/
|
|
static void
|
|
handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
sigset_t *oldset, struct pt_regs *regs)
|
|
{
|
|
/* are we from a system call? */
|
|
if (regs->orig_d0 >= 0)
|
|
/* If so, check system call restarting.. */
|
|
handle_restart(regs, ka, 1);
|
|
|
|
/* 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;
|
|
|
|
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
|
|
if (!(ka->sa.sa_flags & SA_NODEFER))
|
|
sigaddset(¤t->blocked,sig);
|
|
recalc_sigpending();
|
|
}
|
|
|
|
/*
|
|
* 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(sigset_t *oldset, struct pt_regs *regs)
|
|
{
|
|
siginfo_t info;
|
|
struct k_sigaction ka;
|
|
int signr;
|
|
|
|
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, &ka, &info, oldset, regs);
|
|
return 1;
|
|
}
|
|
|
|
/* Did we come from a system call? */
|
|
if (regs->orig_d0 >= 0)
|
|
/* Restart the system call - no handlers present */
|
|
handle_restart(regs, NULL, 0);
|
|
|
|
return 0;
|
|
}
|