| /* |
| * This file is part of ltrace. |
| * Copyright (C) 2012 Petr Machata, Red Hat Inc. |
| * |
| * 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., 51 Franklin St, Fifth Floor, Boston, MA |
| * 02110-1301 USA |
| */ |
| |
| /* Instruction masks used during single-stepping of atomic |
| * sequences. This was lifted from GDB. */ |
| #define LWARX_MASK 0xfc0007fe |
| #define LWARX_INSTRUCTION 0x7c000028 |
| #define LDARX_INSTRUCTION 0x7c0000A8 |
| #define STWCX_MASK 0xfc0007ff |
| #define STWCX_INSTRUCTION 0x7c00012d |
| #define STDCX_INSTRUCTION 0x7c0001ad |
| #define BRANCH_MASK 0xfc000000 |
| #define BC_MASK 0xfc000000 |
| #define BC_INSN 0x40000000 |
| #define B_INSN 0x48000000 |
| |
| static inline arch_addr_t |
| ppc_branch_dest(arch_addr_t addr, uint32_t insn) |
| { |
| int immediate = ((insn & 0xfffc) ^ 0x8000) - 0x8000; |
| int absolute = insn & 2; |
| |
| /* XXX drop the following double casts. */ |
| if (absolute) |
| return (arch_addr_t)(uintptr_t)immediate; |
| else |
| return addr + (uintptr_t)immediate; |
| } |
