1 /* This file is part of the program psim. 2 3 Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au> 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 19 */ 20 21 22 /* branch macro's: 23 24 The macro's below implement the semantics of the PowerPC jump 25 instructions. */ 26 27 28 /* If so required, update the Link Register with the next sequential 29 instruction address */ 30 31 #define UPDATE_LK \ 32 do { \ 33 if (update_LK) { \ 34 ppc_ia target = cia + 4; \ 35 ppc_spr new_address = (ppc_spr)IEA_MASKED(ppc_is_64bit(processor), \ 36 target); \ 37 LR = new_address; \ 38 } \ 39 ITRACE(trace_branch, \ 40 ("UPDATE_LK - update_LK=%d lr=0x%x cia=0x%x\n", \ 41 update_LK, LR, cia); \ 42 } while (0) 43 44 45 /* take the branch - absolute or relative - possibly updating the link 46 register */ 47 48 #define BRANCH(ADDRESS) \ 49 do { \ 50 UPDATE_LK; \ 51 if (update_AA) { \ 52 ppc_ia target = (ppc_ia)(ADDRESS); \ 53 nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \ 54 } \ 55 else { \ 56 ppc_ia target = cia + ADDRESS; \ 57 nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \ 58 } \ 59 PTRACE(trace_branch, \ 60 ("BRANCH - update_AA=%d update_LK=%d nia=0x%x cia=0x%x\n", \ 61 update_AA, update_LK, nia, cia); \ 62 } while (0) 63