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83 lines
2.8 KiB
83 lines
2.8 KiB
/*
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* Copyright (c) 2003 Russell King <rmk@arm.linux.org.uk>
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* Copyright (c) 2011-2013 Denys Vlasenko <vda.linux@googlemail.com>
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* Copyright (c) 2011-2015 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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/* Return codes: 1 - ok, 0 - ignore, other - error. */
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static int
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arch_get_scno(struct tcb *tcp)
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{
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kernel_ulong_t scno = 0;
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/* Note: we support only 32-bit CPUs, not 26-bit */
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#if !defined(__ARM_EABI__) || ENABLE_ARM_OABI
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if (arm_regs.ARM_cpsr & 0x20) {
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/* Thumb mode */
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goto scno_in_r7;
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}
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/* ARM mode */
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/* Check EABI/OABI by examining SVC insn's low 24 bits */
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errno = 0;
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scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL);
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if (errno)
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return -1;
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/* EABI syscall convention? */
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if (scno != 0xef000000) {
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/* No, it's OABI */
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if ((scno & 0x0ff00000) != 0x0f900000) {
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error_msg("pid %d unknown syscall trap 0x%08lx",
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tcp->pid, scno);
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return -1;
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}
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/* Fixup the syscall number */
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scno &= 0x000fffff;
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} else {
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scno_in_r7:
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scno = arm_regs.ARM_r7;
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}
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#else /* __ARM_EABI__ || !ENABLE_ARM_OABI */
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scno = arm_regs.ARM_r7;
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#endif
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/*
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* Do some sanity checks to figure out
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* whether it's really a syscall entry.
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*/
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if (arm_regs.ARM_ip && !scno_in_range(scno)) {
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debug_msg("pid %d stray syscall exit: ARM_ip = %ld, scno = %ld",
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tcp->pid, arm_regs.ARM_ip, scno);
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return 0;
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}
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tcp->scno = scno;
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return 1;
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}
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