Dmitry V. Levin
92e347b556
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35 lines
843 B
C
35 lines
843 B
C
/*
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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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* SPDX-License-Identifier: LGPL-2.1-or-later
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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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/*
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* In the new syscall ABI, the system call number is in R3.
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*/
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if (upeek(tcp, 4*(REG_REG0+3), &scno) < 0)
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return -1;
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if ((long) scno < 0) {
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/* Odd as it may seem, a glibc bug has been known to cause
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glibc to issue bogus negative syscall numbers. So for
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our purposes, make strace print what it *should* have been */
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kernel_ulong_t correct_scno = (scno & 0xff);
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if (debug_flag)
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error_msg("Detected glibc bug: bogus system call"
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" number = %ld, correcting to %ld",
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scno, correct_scno);
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scno = correct_scno;
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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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