1305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata/* 2305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * This file is part of ltrace. 3305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * Copyright (C) 2012 Petr Machata, Red Hat Inc. 4305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * 5305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * This program is free software; you can redistribute it and/or 6305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * modify it under the terms of the GNU General Public License as 7305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * published by the Free Software Foundation; either version 2 of the 8305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * License, or (at your option) any later version. 9305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * 10305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * This program is distributed in the hope that it will be useful, but 11305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * WITHOUT ANY WARRANTY; without even the implied warranty of 12305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * General Public License for more details. 14305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * 15305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * You should have received a copy of the GNU General Public License 16305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * along with this program; if not, write to the Free Software 17305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 18305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * 02110-1301 USA 19305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata */ 20305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata 21305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata/* Instruction masks used during single-stepping of atomic 22305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata * sequences. This was lifted from GDB. */ 23305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define LWARX_MASK 0xfc0007fe 24305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define LWARX_INSTRUCTION 0x7c000028 25305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define LDARX_INSTRUCTION 0x7c0000A8 26305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define STWCX_MASK 0xfc0007ff 27305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define STWCX_INSTRUCTION 0x7c00012d 28305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define STDCX_INSTRUCTION 0x7c0001ad 29305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define BRANCH_MASK 0xfc000000 30305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define BC_MASK 0xfc000000 31305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define BC_INSN 0x40000000 32305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata#define B_INSN 0x48000000 33305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata 34305945b2523ea87907952eefd7300cfb9f1a0235Petr Machatastatic inline arch_addr_t 35305945b2523ea87907952eefd7300cfb9f1a0235Petr Machatappc_branch_dest(arch_addr_t addr, uint32_t insn) 36305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata{ 37305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata int immediate = ((insn & 0xfffc) ^ 0x8000) - 0x8000; 38305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata int absolute = insn & 2; 39305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata 40305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata /* XXX drop the following double casts. */ 41305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata if (absolute) 42305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata return (arch_addr_t)(uintptr_t)immediate; 43305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata else 44305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata return addr + (uintptr_t)immediate; 45305945b2523ea87907952eefd7300cfb9f1a0235Petr Machata} 46