| Petr Machata | 305945b | 2012-11-07 16:08:14 +0100 | [diff] [blame] | 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 | } |