| #!/bin/sh |
| # SPDX-License-Identifier: GPL-2.0 |
| # description: ftrace - function graph print function return value |
| # requires: options/funcgraph-retval options/funcgraph-retval-hex function_graph:tracer |
| |
| # Make sure that funcgraph-retval works |
| |
| fail() { # msg |
| echo $1 |
| exit_fail |
| } |
| |
| disable_tracing |
| clear_trace |
| |
| # get self PID, can not use $$, because it is PPID |
| read PID _ < /proc/self/stat |
| |
| [ -f set_ftrace_filter ] && echo proc_reg_write > set_ftrace_filter |
| [ -f set_ftrace_pid ] && echo ${PID} > set_ftrace_pid |
| echo function_graph > current_tracer |
| echo 1 > options/funcgraph-retval |
| |
| set +e |
| enable_tracing |
| echo > /proc/interrupts |
| disable_tracing |
| set -e |
| |
| : "Test printing the error code in signed decimal format" |
| echo 0 > options/funcgraph-retval-hex |
| count=`cat trace | grep 'proc_reg_write' | grep -e '=-5 ' -e '= -5 ' | wc -l` |
| if [ $count -eq 0 ]; then |
| fail "Return value can not be printed in signed decimal format" |
| fi |
| |
| : "Test printing the error code in hexadecimal format" |
| echo 1 > options/funcgraph-retval-hex |
| count=`cat trace | grep 'proc_reg_write' | grep 'fffffffb' | wc -l` |
| if [ $count -eq 0 ]; then |
| fail "Return value can not be printed in hexadecimal format" |
| fi |
| |
| exit 0 |
