45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2012 Petr Machata, Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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/* Instruction masks used during single-stepping of atomic
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* sequences. This was lifted from GDB. */
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#define LWARX_MASK 0xfc0007fe
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#define LWARX_INSTRUCTION 0x7c000028
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#define LDARX_INSTRUCTION 0x7c0000A8
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#define STWCX_MASK 0xfc0007ff
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#define STWCX_INSTRUCTION 0x7c00012d
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#define STDCX_INSTRUCTION 0x7c0001ad
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#define BRANCH_MASK 0xfc000000
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#define BC_MASK 0xfc000000
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#define BC_INSN 0x40000000
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#define B_INSN 0x48000000
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static inline arch_addr_t
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ppc_branch_dest(arch_addr_t addr, uint32_t insn)
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{
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int immediate = ((insn & 0xfffc) ^ 0x8000) - 0x8000;
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int absolute = insn & 2;
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/* XXX drop the following double casts. */
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if (absolute)
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return (arch_addr_t)(uintptr_t)immediate;
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else
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return addr + (uintptr_t)immediate;
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}
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