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 \
32do { \
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) \
49do { \
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