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| author | Michael Meissner <gnu@the-meissners.org> | 1995-08-23 21:06:36 +0000 |
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| committer | Michael Meissner <gnu@the-meissners.org> | 1995-08-23 21:06:36 +0000 |
| commit | cb7a68927ab066fb794ed40ad38f601845516fe4 (patch) | |
| tree | 393e8c5129cfacb4fdf20ecbbeb8125c06041a7f /sim/ppc/idecode_branch.h | |
| parent | 19c3fec4bf74083f6136dd64e4b503426c77b474 (diff) | |
| download | gdb-cb7a68927ab066fb794ed40ad38f601845516fe4.zip gdb-cb7a68927ab066fb794ed40ad38f601845516fe4.tar.gz gdb-cb7a68927ab066fb794ed40ad38f601845516fe4.tar.bz2 | |
Add PowerPC simulator from Andrew Cagney <cagney@highland.com.au>
Diffstat (limited to 'sim/ppc/idecode_branch.h')
| -rw-r--r-- | sim/ppc/idecode_branch.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/sim/ppc/idecode_branch.h b/sim/ppc/idecode_branch.h new file mode 100644 index 0000000..ecae98e --- /dev/null +++ b/sim/ppc/idecode_branch.h @@ -0,0 +1,62 @@ +/* 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) |