示例#1
0
文件: signal.c 项目: TitaniumBoy/lin
void do_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_signal_frame *sf;
	unsigned long tpc, tnpc, tstate;
	__siginfo_fpu_t *fpu_save;
	sigset_t set;
	stack_t st;
	int err;

	synchronize_user_stack ();
	sf = (struct rt_signal_frame *)
		(regs->u_regs [UREG_FP] + STACK_BIAS);

	/* 1. Make sure we are not getting garbage from the user */
	if (((unsigned long) sf) & 3)
		goto segv;

	err = get_user(tpc, &sf->regs.tpc);
	err |= __get_user(tnpc, &sf->regs.tnpc);
	if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
		tpc &= 0xffffffff;
		tnpc &= 0xffffffff;
	}
	err |= ((tpc | tnpc) & 3);

	/* 2. Restore the state */
	err |= __get_user(regs->y, &sf->regs.y);
	err |= __get_user(tstate, &sf->regs.tstate);
	err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));

	/* User can only change condition codes in %tstate. */
	regs->tstate &= ~(TSTATE_ICC);
	regs->tstate |= (tstate & TSTATE_ICC);

	err |= __get_user(fpu_save, &sf->fpu_save);
	if (fpu_save)
		err |= restore_fpu_state(regs, &sf->fpu_state);

	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
	err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
	
	if (err)
		goto segv;
		
	regs->tpc = tpc;
	regs->tnpc = tnpc;
	
	/* It is more difficult to avoid calling this function than to
	   call it and ignore errors.  */
	do_sigaltstack(&st, NULL, (unsigned long)sf);

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sigmask_lock);
	current->blocked = set;
	recalc_sigpending(current);
	spin_unlock_irq(&current->sigmask_lock);
	return;
segv:
	send_sig(SIGSEGV, current, 1);
}
示例#2
0
void fpu_handler(void)
{
	task_t* task = per_core(current_task);
	uint32_t core_id = CORE_ID;

	task->flags |= TASK_FPU_USED;

	if (!(task->flags & TASK_FPU_INIT))  {
		// use the FPU at the first time => Initialize FPU
		fpu_init(&task->fpu);
		task->flags |= TASK_FPU_INIT;
	}

	if (readyqueues[core_id].fpu_owner == task->id)
		return;

	spinlock_irqsave_lock(&readyqueues[core_id].lock);
	// did another already use the the FPU? => save FPU state
	if (readyqueues[core_id].fpu_owner) {
		save_fpu_state(&(task_table[readyqueues[core_id].fpu_owner].fpu));
		task_table[readyqueues[core_id].fpu_owner].flags &= ~TASK_FPU_USED;
	}
	readyqueues[core_id].fpu_owner = task->id;
	spinlock_irqsave_unlock(&readyqueues[core_id].lock);

	restore_fpu_state(&task->fpu);
}
示例#3
0
void do_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_signal_frame __user *sf;
	unsigned long tpc, tnpc, tstate;
	__siginfo_fpu_t __user *fpu_save;
	sigset_t set;
	int err;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

	synchronize_user_stack ();
	sf = (struct rt_signal_frame __user *)
		(regs->u_regs [UREG_FP] + STACK_BIAS);

	/* 1. Make sure we are not getting garbage from the user */
	if (((unsigned long) sf) & 3)
		goto segv;

	err = get_user(tpc, &sf->regs.tpc);
	err |= __get_user(tnpc, &sf->regs.tnpc);
	if (test_thread_flag(TIF_32BIT)) {
		tpc &= 0xffffffff;
		tnpc &= 0xffffffff;
	}
	err |= ((tpc | tnpc) & 3);

	/* 2. Restore the state */
	err |= __get_user(regs->y, &sf->regs.y);
	err |= __get_user(tstate, &sf->regs.tstate);
	err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));

	/* User can only change condition codes and %asi in %tstate. */
	regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
	regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));

	err |= __get_user(fpu_save, &sf->fpu_save);
	if (fpu_save)
		err |= restore_fpu_state(regs, &sf->fpu_state);

	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
	err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);

	if (err)
		goto segv;

	regs->tpc = tpc;
	regs->tnpc = tnpc;

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);
	return;
segv:
	force_sig(SIGSEGV, current);
}
示例#4
0
asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_signal_frame __user *sf;
	unsigned int psr, pc, npc;
	__siginfo_fpu_t __user *fpu_save;
	__siginfo_rwin_t __user *rwin_save;
	sigset_t set;
	int err;

	synchronize_user_stack();
	sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
	if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
	    (((unsigned long) sf) & 0x03))
		goto segv;

	err = __get_user(pc, &sf->regs.pc);
	err |= __get_user(npc, &sf->regs.npc);
	err |= ((pc | npc) & 0x03);

	err |= __get_user(regs->y, &sf->regs.y);
	err |= __get_user(psr, &sf->regs.psr);

	err |= __copy_from_user(&regs->u_regs[UREG_G1],
				&sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));

	regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);

	/* Prevent syscall restart.  */
	pt_regs_clear_syscall(regs);

	err |= __get_user(fpu_save, &sf->fpu_save);
	if (!err && fpu_save)
		err |= restore_fpu_state(regs, fpu_save);
	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
	err |= restore_altstack(&sf->stack);
	
	if (err)
		goto segv;
		
	regs->pc = pc;
	regs->npc = npc;
	
	err |= __get_user(rwin_save, &sf->rwin_save);
	if (!err && rwin_save) {
		if (restore_rwin_state(rwin_save))
			goto segv;
	}

	set_current_blocked(&set);
	return;
segv:
	force_sig(SIGSEGV, current);
}
示例#5
0
文件: signal.c 项目: FireBurn/linux
static long restore_sigcontext(struct pt_regs *regs,
	struct sigcontext __user *sc)
{
	int err = 0;

	/* sc_pt_regs is structured the same as the start of pt_regs */
	err |= __copy_from_user(regs, &sc->sc_pt_regs, sizeof(struct pt_regs));

	/* Restore the floating-point state. */
	err |= restore_fpu_state(sc);

	return err;
}
示例#6
0
asmlinkage void do_sigreturn(struct pt_regs *regs)
{
	struct signal_frame __user *sf;
	unsigned long up_psr, pc, npc;
	sigset_t set;
	__siginfo_fpu_t __user *fpu_save;
	__siginfo_rwin_t __user *rwin_save;
	int err;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

	synchronize_user_stack();

	sf = (struct signal_frame __user *) regs->u_regs[UREG_FP];

	/* 1. Make sure we are not getting garbage from the user */
	if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
		goto segv_and_exit;

	if (((unsigned long) sf) & 3)
		goto segv_and_exit;

	err = __get_user(pc,  &sf->info.si_regs.pc);
	err |= __get_user(npc, &sf->info.si_regs.npc);

	if ((pc | npc) & 3)
		goto segv_and_exit;

	/* 2. Restore the state */
	up_psr = regs->psr;
	err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));

	/* User can only change condition codes and FPU enabling in %psr. */
	regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
		  | (regs->psr & (PSR_ICC | PSR_EF));

	/* Prevent syscall restart.  */
	pt_regs_clear_syscall(regs);

	err |= __get_user(fpu_save, &sf->fpu_save);
	if (fpu_save)
		err |= restore_fpu_state(regs, fpu_save);
	err |= __get_user(rwin_save, &sf->rwin_save);
	if (rwin_save)
		err |= restore_rwin_state(rwin_save);

	/* This is pretty much atomic, no amount locking would prevent
	 * the races which exist anyways.
	 */
	err |= __get_user(set.sig[0], &sf->info.si_mask);
	err |= __copy_from_user(&set.sig[1], &sf->extramask,
			        (_NSIG_WORDS-1) * sizeof(unsigned int));
			   
	if (err)
		goto segv_and_exit;

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

segv_and_exit:
	force_sig(SIGSEGV, current);
}
示例#7
0
asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_signal_frame __user *sf;
	unsigned int psr, pc, npc;
	__siginfo_fpu_t __user *fpu_save;
	__siginfo_rwin_t __user *rwin_save;
	mm_segment_t old_fs;
	sigset_t set;
	stack_t st;
	int err;

	synchronize_user_stack();
	sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
	if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
	    (((unsigned long) sf) & 0x03))
		goto segv;

	err = __get_user(pc, &sf->regs.pc);
	err |= __get_user(npc, &sf->regs.npc);
	err |= ((pc | npc) & 0x03);

	err |= __get_user(regs->y, &sf->regs.y);
	err |= __get_user(psr, &sf->regs.psr);

	err |= __copy_from_user(&regs->u_regs[UREG_G1],
				&sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));

	regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);

	/* Prevent syscall restart.  */
	pt_regs_clear_syscall(regs);

	err |= __get_user(fpu_save, &sf->fpu_save);
	if (!err && fpu_save)
		err |= restore_fpu_state(regs, fpu_save);
	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
	
	err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
	
	if (err)
		goto segv;
		
	regs->pc = pc;
	regs->npc = npc;
	
	/* It is more difficult to avoid calling this function than to
	 * call it and ignore errors.
	 */
	old_fs = get_fs();
	set_fs(KERNEL_DS);
	do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
	set_fs(old_fs);

	err |= __get_user(rwin_save, &sf->rwin_save);
	if (!err && rwin_save) {
		if (restore_rwin_state(rwin_save))
			goto segv;
	}

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);
	return;
segv:
	force_sig(SIGSEGV, current);
}
示例#8
0
void
sigtrap_handler(HANDLER_ARGS)
{
    unsigned int trap;
    os_context_t* os_context = (os_context_t *) context;
#if 0
    fprintf(stderr, "x86sigtrap: %8x %x\n",
            SC_PC(os_os_context), *(unsigned char *) (SC_PC(os_context) - 1));
    fprintf(stderr, "sigtrap(%d %d %x)\n", signal, CODE(code), os_context);
#endif

    if (single_stepping && (signal == SIGTRAP)) {
#if 0
	fprintf(stderr, "* Single step trap %p\n", single_stepping);
#endif

#ifdef SC_EFLAGS
	/* Disable single-stepping */
	SC_EFLAGS(os_context) ^= 0x100;
#else
	/* Un-install single step helper instructions. */
	*(single_stepping - 3) = single_step_save1;
	*(single_stepping - 2) = single_step_save2;
	*(single_stepping - 1) = single_step_save3;
        DPRINTF(0, (stderr, "Uninstalling helper instructions\n"));
#endif

	/*
	 * Re-install the breakpoint if possible.
	 */
	if ((int) SC_PC(os_context) == (int) single_stepping + 1)
	    fprintf(stderr, "* Breakpoint not re-install\n");
	else {
	    char *ptr = (char *) single_stepping;

	    ptr[0] = BREAKPOINT_INST;	/* x86 INT3 */
	    ptr[1] = trap_Breakpoint;
	}

	single_stepping = NULL;
	return;
    }

    /* This is just for info in case monitor wants to print an approx */
    current_control_stack_pointer = (unsigned long *) SC_SP(os_context);

    RESTORE_FPU(os_context);

    /*
     * On entry %eip points just after the INT3 byte and aims at the
     * 'kind' value (eg trap_Cerror). For error-trap and Cerror-trap a
     * number of bytes will follow, the first is the length of the byte
     * arguments to follow.
     */

    trap = *(unsigned char *) SC_PC(os_context);

    switch (trap) {
      case trap_PendingInterrupt:
	  DPRINTF(0, (stderr, "<trap Pending Interrupt.>\n"));
	  arch_skip_instruction(os_context);
	  interrupt_handle_pending(os_context);
	  break;

      case trap_Halt:
	  {
              FPU_STATE(fpu_state);
              save_fpu_state(fpu_state);

	      fake_foreign_function_call(os_context);
	      lose("%%primitive halt called; the party is over.\n");
	      undo_fake_foreign_function_call(os_context);

              restore_fpu_state(fpu_state);
	      arch_skip_instruction(os_context);
	      break;
	  }

      case trap_Error:
      case trap_Cerror:
	  DPRINTF(0, (stderr, "<trap Error %x>\n", CODE(code)));
	  interrupt_internal_error(signal, code, os_context, CODE(code) == trap_Cerror);
	  break;

      case trap_Breakpoint:
#if 0
	  fprintf(stderr, "*C break\n");
#endif
	  SC_PC(os_context) -= 1;

	  handle_breakpoint(signal, CODE(code), os_context);
#if 0
	  fprintf(stderr, "*C break return\n");
#endif
	  break;

      case trap_FunctionEndBreakpoint:
	  SC_PC(os_context) -= 1;
	  SC_PC(os_context) =
	      (int) handle_function_end_breakpoint(signal, CODE(code), os_context);
	  break;

#ifdef trap_DynamicSpaceOverflowWarning
      case trap_DynamicSpaceOverflowWarning:
	  interrupt_handle_space_overflow(SymbolFunction
					  (DYNAMIC_SPACE_OVERFLOW_WARNING_HIT),
					  os_context);
	  break;
#endif
#ifdef trap_DynamicSpaceOverflowError
      case trap_DynamicSpaceOverflowError:
	  interrupt_handle_space_overflow(SymbolFunction
					  (DYNAMIC_SPACE_OVERFLOW_ERROR_HIT),
					  os_context);
	  break;
#endif
      default:
	  DPRINTF(0,
		  (stderr, "[C--trap default %d %d %p]\n", signal, CODE(code),
		   os_context));
	  interrupt_handle_now(signal, code, os_context);
	  break;
    }
}
示例#9
0
void do_rt_sigreturn(struct pt_regs *regs)
{
	unsigned long tpc, tnpc, tstate, ufp;
	struct rt_signal_frame __user *sf;
	__siginfo_fpu_t __user *fpu_save;
	__siginfo_rwin_t __user *rwin_save;
	sigset_t set;
	int err;

	/* Always make any pending restarted system calls return -EINTR */
	current->restart_block.fn = do_no_restart_syscall;

	synchronize_user_stack ();
	sf = (struct rt_signal_frame __user *)
		(regs->u_regs [UREG_FP] + STACK_BIAS);

	/* 1. Make sure we are not getting garbage from the user */
	if (invalid_frame_pointer(sf))
		goto segv;

	if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
		goto segv;

	if ((ufp + STACK_BIAS) & 0x7)
		goto segv;

	err = __get_user(tpc, &sf->regs.tpc);
	err |= __get_user(tnpc, &sf->regs.tnpc);
	if (test_thread_flag(TIF_32BIT)) {
		tpc &= 0xffffffff;
		tnpc &= 0xffffffff;
	}
	err |= ((tpc | tnpc) & 3);

	/* 2. Restore the state */
	err |= __get_user(regs->y, &sf->regs.y);
	err |= __get_user(tstate, &sf->regs.tstate);
	err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));

	/* User can only change condition codes and %asi in %tstate. */
	regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
	regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));

	err |= __get_user(fpu_save, &sf->fpu_save);
	if (!err && fpu_save)
		err |= restore_fpu_state(regs, fpu_save);

	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
	err |= restore_altstack(&sf->stack);
	if (err)
		goto segv;

	err |= __get_user(rwin_save, &sf->rwin_save);
	if (!err && rwin_save) {
		if (restore_rwin_state(rwin_save))
			goto segv;
	}

	regs->tpc = tpc;
	regs->tnpc = tnpc;

	/* Prevent syscall restart.  */
	pt_regs_clear_syscall(regs);

	set_current_blocked(&set);
	return;
segv:
	force_sig(SIGSEGV, current);
}
void do_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_signal_frame __user *sf;
	unsigned long tpc, tnpc, tstate;
	__siginfo_fpu_t __user *fpu_save;
	__siginfo_rwin_t __user *rwin_save;
	sigset_t set;
	int err;

	
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

	synchronize_user_stack ();
	sf = (struct rt_signal_frame __user *)
		(regs->u_regs [UREG_FP] + STACK_BIAS);

	
	if (((unsigned long) sf) & 3)
		goto segv;

	err = get_user(tpc, &sf->regs.tpc);
	err |= __get_user(tnpc, &sf->regs.tnpc);
	if (test_thread_flag(TIF_32BIT)) {
		tpc &= 0xffffffff;
		tnpc &= 0xffffffff;
	}
	err |= ((tpc | tnpc) & 3);

	
	err |= __get_user(regs->y, &sf->regs.y);
	err |= __get_user(tstate, &sf->regs.tstate);
	err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));

	
	regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
	regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));

	err |= __get_user(fpu_save, &sf->fpu_save);
	if (!err && fpu_save)
		err |= restore_fpu_state(regs, fpu_save);

	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
	err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);

	if (err)
		goto segv;

	err |= __get_user(rwin_save, &sf->rwin_save);
	if (!err && rwin_save) {
		if (restore_rwin_state(rwin_save))
			goto segv;
	}

	regs->tpc = tpc;
	regs->tnpc = tnpc;

	
	pt_regs_clear_syscall(regs);

	sigdelsetmask(&set, ~_BLOCKABLE);
	set_current_blocked(&set);
	return;
segv:
	force_sig(SIGSEGV, current);
}