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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# CoreSight emulated instruction entry and exit (exclusive)
. "$(dirname "$0")/../lib/coresight_exception.sh"
test_trap_entry_exit()
{
local attempt result
# traploop reads ID_AA64ISAR0_EL1 from EL0. The kernel emulates MRS and
# advances the saved PC, so IRET must resume four bytes after the trap.
for attempt in 1 2 3; do
echo "Recording emulated instructions (attempt $attempt/3)"
if ! record_trace traploop 256; then
cat "$tmpdir/record.log"
echo "Failed to record the traploop workload"
return 1
fi
decode_trace || return 1
# Select MRS Xt, ID_AA64ISAR0_EL1; the low five bits select Xt.
check_exception_pairs "int.*insn: [01][[:xdigit:]] 06 38 d5" "iret" 4
result=$?
# An instruction page fault at MRS can also match the opcode filter.
# Retry failed checks to tolerate such transient faults.
case $result in
0) return 0 ;;
1|2) continue ;;
*) return "$result" ;;
esac
done
echo "FAIL: No valid trap pair after three recordings"
return 1
}
setup_exception_test || exit $?
test_trap_entry_exit
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