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linux/arch/m68k/kernel/signal.c
Laurent MEYER d09042da72 [PATCH] fix incorrect SA_ONSTACK behaviour for 64-bit processes 
- When setting a sighandler using sigaction() call, if the flag
  SA_ONSTACK is set and no alternate stack is provided via sigaltstack(),
  the kernel still try to install the alternate stack.  This behavior is
  the opposite of the one which is documented in Single Unix Specifications
  V3.

- Also when setting an alternate stack using sigaltstack() with the flag
  SS_DISABLE, the kernel try to install the alternate stack on signal
  delivery.

These two use cases makes the process crash at signal delivery.

Signed-off-by: Laurent Meyer <meyerlau@fr.ibm.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 07:43:05 -07:00

1026 lines
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/*
* 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(&current->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;
/* 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;
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);
/* 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));
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 -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(&current->blocked,&current->blocked,&ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NODEFER))
sigaddset(&current->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 = &current->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;
}
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