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 3 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, see <http://www.gnu.org/licenses/>. 17 18 */ 19 20 21 /* branch macro's: 22 23 The macro's below implement the semantics of the PowerPC jump 24 instructions. */ 25 26 27 /* If so required, update the Link Register with the next sequential 28 instruction address */ 29 30 #define UPDATE_LK \ 31 do { \ 32 if (update_LK) { \ 33 ppc_ia target = cia + 4; \ 34 ppc_spr new_address = (ppc_spr)IEA_MASKED(ppc_is_64bit(processor), \ 35 target); \ 36 LR = new_address; \ 37 } \ 38 ITRACE(trace_branch, \ 39 ("UPDATE_LK - update_LK=%d lr=0x%x cia=0x%x\n", \ 40 update_LK, LR, cia); \ 41 } while (0) 42 43 44 /* take the branch - absolute or relative - possibly updating the link 45 register */ 46 47 #define BRANCH(ADDRESS) \ 48 do { \ 49 UPDATE_LK; \ 50 if (update_AA) { \ 51 ppc_ia target = (ppc_ia)(ADDRESS); \ 52 nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \ 53 } \ 54 else { \ 55 ppc_ia target = cia + ADDRESS; \ 56 nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \ 57 } \ 58 PTRACE(trace_branch, \ 59 ("BRANCH - update_AA=%d update_LK=%d nia=0x%x cia=0x%x\n", \ 60 update_AA, update_LK, nia, cia); \ 61 } while (0) 62