1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2012 Petr Machata, Red Hat Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * 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., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 */
20
21/* Instruction masks used during single-stepping of atomic
22 * sequences.  This was lifted from GDB.  */
23#define LWARX_MASK 0xfc0007fe
24#define LWARX_INSTRUCTION 0x7c000028
25#define LDARX_INSTRUCTION 0x7c0000A8
26#define STWCX_MASK 0xfc0007ff
27#define STWCX_INSTRUCTION 0x7c00012d
28#define STDCX_INSTRUCTION 0x7c0001ad
29#define BRANCH_MASK 0xfc000000
30#define BC_MASK 0xfc000000
31#define BC_INSN 0x40000000
32#define B_INSN 0x48000000
33
34static inline arch_addr_t
35ppc_branch_dest(arch_addr_t addr, uint32_t insn)
36{
37	int immediate = ((insn & 0xfffc) ^ 0x8000) - 0x8000;
38	int absolute = insn & 2;
39
40	/* XXX drop the following double casts.  */
41	if (absolute)
42		return (arch_addr_t)(uintptr_t)immediate;
43	else
44		return addr + (uintptr_t)immediate;
45}
46