Subversion Repositories openrisc_2011-10-31

/*  This file is part of the program psim.

    Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>

    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.

    */

/* branch macro's:

   The macro's below implement the semantics of the PowerPC jump

   instructions. */

/* If so required, update the Link Register with the next sequential

   instruction address */

#define UPDATE_LK \

do { \

  if (update_LK) { \

    ppc_ia target = cia + 4; \

    ppc_spr new_address = (ppc_spr)IEA_MASKED(ppc_is_64bit(processor), \

                                              target); \

    LR = new_address; \

  } \

  ITRACE(trace_branch, \

         ("UPDATE_LK - update_LK=%d lr=0x%x cia=0x%x\n", \

          update_LK, LR, cia); \

} while (0)

/* take the branch - absolute or relative - possibly updating the link

   register */

#define BRANCH(ADDRESS) \

do { \

  UPDATE_LK; \

  if (update_AA) { \

    ppc_ia target = (ppc_ia)(ADDRESS); \

    nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \

  } \

  else { \

    ppc_ia target = cia + ADDRESS; \

    nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \

  } \

  PTRACE(trace_branch, \

         ("BRANCH - update_AA=%d update_LK=%d nia=0x%x cia=0x%x\n", \

          update_AA, update_LK, nia, cia); \

} while (0)