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 34 static inline arch_addr_t 35 ppc_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
