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70 lines
2.8 KiB
70 lines
2.8 KiB
/*
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* Copyright (c) 2013 Denys Vlasenko <vda.linux@googlemail.com>
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* Copyright (c) 2013-2015 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2015-2018 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* PTRACE_GETREGSET was added to the kernel in v2.6.25,
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* a PTRACE_GETREGS based fallback is provided for old kernels.
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*/
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static int
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getregs_old(struct tcb *tcp)
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{
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/* Use old method, with unreliable heuristical detection of 32-bitness. */
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long r = ptrace(PTRACE_GETREGS, tcp->pid, NULL, &x86_64_regs);
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if (r)
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return r;
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if (x86_64_regs.cs == 0x23) {
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x86_io.iov_len = sizeof(i386_regs);
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/*
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* The order is important: i386_regs and x86_64_regs
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* are overlaid in memory!
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*/
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i386_regs.ebx = x86_64_regs.rbx;
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i386_regs.ecx = x86_64_regs.rcx;
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i386_regs.edx = x86_64_regs.rdx;
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i386_regs.esi = x86_64_regs.rsi;
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i386_regs.edi = x86_64_regs.rdi;
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i386_regs.ebp = x86_64_regs.rbp;
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i386_regs.eax = x86_64_regs.rax;
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/* i386_regs.xds = x86_64_regs.ds; unused by strace */
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/* i386_regs.xes = x86_64_regs.es; ditto... */
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/* i386_regs.xfs = x86_64_regs.fs; */
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/* i386_regs.xgs = x86_64_regs.gs; */
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i386_regs.orig_eax = x86_64_regs.orig_rax;
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i386_regs.eip = x86_64_regs.rip;
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/* i386_regs.xcs = x86_64_regs.cs; */
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/* i386_regs.eflags = x86_64_regs.eflags; */
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i386_regs.esp = x86_64_regs.rsp;
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/* i386_regs.xss = x86_64_regs.ss; */
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} else {
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x86_io.iov_len = sizeof(x86_64_regs);
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}
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return 0;
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}
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