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/* Return codes: 1 - ok, 0 - ignore, other - error. */
static int
arch_get_scno(struct tcb *tcp)
{
long scno = 0;
/*
* In the new syscall ABI, the system call number is in R3.
*/
if (upeek(tcp->pid, 4*(REG_REG0+3), &scno) < 0)
return -1;
if (scno < 0) {
/* Odd as it may seem, a glibc bug has been known to cause
glibc to issue bogus negative syscall numbers. So for
our purposes, make strace print what it *should* have been */
long correct_scno = (scno & 0xff);
if (debug_flag)
error_msg("Detected glibc bug: bogus system call"
" number = %ld, correcting to %ld",
scno, correct_scno);
scno = correct_scno;
}
tcp->scno = scno;
return 1;
}
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