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signal_n32.c

/*
 * Copyright (C) 2003 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/cache.h>
#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/ptrace.h>
#include <linux/unistd.h>
#include <linux/compat.h>
#include <linux/bitops.h>

#include <asm/abi.h>
#include <asm/asm.h>
#include <asm/cacheflush.h>
#include <asm/compat-signal.h>
#include <asm/sim.h>
#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include <asm/system.h>
#include <asm/fpu.h>
#include <asm/cpu-features.h>
#include <asm/war.h>

#include "signal-common.h"

/*
 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
 */
#define __NR_N32_rt_sigreturn       6211
#define __NR_N32_restart_syscall    6214

extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);


/* IRIX compatible stack_t  */
typedef struct sigaltstack32 {
      s32 ss_sp;
      compat_size_t ss_size;
      int ss_flags;
} stack32_t;

00062 struct ucontextn32 {
      u32                 uc_flags;
      s32                 uc_link;
      stack32_t           uc_stack;
      struct sigcontext   uc_mcontext;
      compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
};

#if ICACHE_REFILLS_WORKAROUND_WAR == 0

00072 struct rt_sigframe_n32 {
      u32 rs_ass[4];                /* argument save space for o32 */
      u32 rs_code[2];               /* signal trampoline */
      struct compat_siginfo rs_info;
      struct ucontextn32 rs_uc;
};

#else  /* ICACHE_REFILLS_WORKAROUND_WAR */

struct rt_sigframe_n32 {
      u32 rs_ass[4];                /* argument save space for o32 */
      u32 rs_pad[2];
      struct compat_siginfo rs_info;
      struct ucontextn32 rs_uc;
      u32 rs_code[8] ____cacheline_aligned;           /* signal trampoline */
};

#endif      /* !ICACHE_REFILLS_WORKAROUND_WAR */

extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);

asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
      compat_sigset_t __user *unewset;
      compat_sigset_t uset;
      size_t sigsetsize;
      sigset_t newset;

      /* XXX Don't preclude handling different sized sigset_t's.  */
      sigsetsize = regs.regs[5];
      if (sigsetsize != sizeof(sigset_t))
            return -EINVAL;

      unewset = (compat_sigset_t __user *) regs.regs[4];
      if (copy_from_user(&uset, unewset, sizeof(uset)))
            return -EFAULT;
      sigset_from_compat(&newset, &uset);
      sigdelsetmask(&newset, ~_BLOCKABLE);

      spin_lock_irq(&current->sighand->siglock);
      current->saved_sigmask = current->blocked;
      current->blocked = newset;
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);

      current->state = TASK_INTERRUPTIBLE;
      schedule();
      set_thread_flag(TIF_RESTORE_SIGMASK);
      return -ERESTARTNOHAND;
}

asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
{
      struct rt_sigframe_n32 __user *frame;
      sigset_t set;
      stack_t st;
      s32 sp;
      int sig;

      frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
      if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
            goto badframe;
      if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
            goto badframe;

      sigdelsetmask(&set, ~_BLOCKABLE);
      spin_lock_irq(&current->sighand->siglock);
      current->blocked = set;
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);

      sig = restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext);
      if (sig < 0)
            goto badframe;
      else if (sig)
            force_sig(sig, current);

      /* The ucontext contains a stack32_t, so we must convert!  */
      if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
            goto badframe;
      st.ss_sp = (void __user *)(long) sp;
      if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
            goto badframe;
      if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
            goto badframe;

      /* It is more difficult to avoid calling this function than to
         call it and ignore errors.  */
      do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);

      /*
       * Don't let your children do this ...
       */
      __asm__ __volatile__(
            "move\t$29, %0\n\t"
            "j\tsyscall_exit"
            :/* no outputs */
            :"r" (&regs));
      /* Unreached */

badframe:
      force_sig(SIGSEGV, current);
}

static int setup_rt_frame_n32(struct k_sigaction * ka,
      struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
{
      struct rt_sigframe_n32 __user *frame;
      int err = 0;
      s32 sp;

      frame = get_sigframe(ka, regs, sizeof(*frame));
      if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
            goto give_sigsegv;

      install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);

      /* Create siginfo.  */
      err |= copy_siginfo_to_user32(&frame->rs_info, info);

      /* Create the ucontext.  */
      err |= __put_user(0, &frame->rs_uc.uc_flags);
      err |= __put_user(0, &frame->rs_uc.uc_link);
      sp = (int) (long) current->sas_ss_sp;
      err |= __put_user(sp,
                        &frame->rs_uc.uc_stack.ss_sp);
      err |= __put_user(sas_ss_flags(regs->regs[29]),
                        &frame->rs_uc.uc_stack.ss_flags);
      err |= __put_user(current->sas_ss_size,
                        &frame->rs_uc.uc_stack.ss_size);
      err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
      err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);

      if (err)
            goto give_sigsegv;

      /*
       * Arguments to signal handler:
       *
       *   a0 = signal number
       *   a1 = 0 (should be cause)
       *   a2 = pointer to ucontext
       *
       * $25 and c0_epc point to the signal handler, $29 points to
       * the struct rt_sigframe.
       */
      regs->regs[ 4] = signr;
      regs->regs[ 5] = (unsigned long) &frame->rs_info;
      regs->regs[ 6] = (unsigned long) &frame->rs_uc;
      regs->regs[29] = (unsigned long) frame;
      regs->regs[31] = (unsigned long) frame->rs_code;
      regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;

      DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
             current->comm, current->pid,
             frame, regs->cp0_epc, regs->regs[31]);

      return 0;

give_sigsegv:
      force_sigsegv(signr, current);
      return -EFAULT;
}

struct mips_abi mips_abi_n32 = {
      .setup_rt_frame   = setup_rt_frame_n32,
      .restart    = __NR_N32_restart_syscall
};

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