61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* branch macro's:
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The macro's below implement the semantics of the PowerPC jump
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instructions. */
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/* If so required, update the Link Register with the next sequential
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instruction address */
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#define UPDATE_LK \
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do { \
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if (update_LK) { \
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ppc_ia target = cia + 4; \
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ppc_spr new_address = (ppc_spr)IEA_MASKED(ppc_is_64bit(processor), \
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target); \
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LR = new_address; \
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} \
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ITRACE(trace_branch, \
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("UPDATE_LK - update_LK=%d lr=0x%x cia=0x%x\n", \
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update_LK, LR, cia); \
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} while (0)
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/* take the branch - absolute or relative - possibly updating the link
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register */
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#define BRANCH(ADDRESS) \
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do { \
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UPDATE_LK; \
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if (update_AA) { \
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ppc_ia target = (ppc_ia)(ADDRESS); \
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nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \
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} \
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else { \
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ppc_ia target = cia + ADDRESS; \
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nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \
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} \
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PTRACE(trace_branch, \
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("BRANCH - update_AA=%d update_LK=%d nia=0x%x cia=0x%x\n", \
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update_AA, update_LK, nia, cia); \
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} while (0)
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