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There are scenes that we want to show the character value of traced
arguments other than a decimal or hexadecimal or string value for debug
convinience. I add a new type named 'char' to do it and a new test case
file named 'kprobe_args_char.tc' to do selftest for char type.
For example:
The to be traced function is 'void demo_func(char type, char *name);', we
can add a kprobe event as follows to show argument values as we want:
echo 'p:myprobe demo_func $arg1:char +0($arg2):char[5]' > kprobe_events
we will get the following trace log:
... myprobe: (demo_func+0x0/0x29) arg1='A' arg2={'b','p','f','1',''}
Link: https://lore.kernel.org/all/20221219110613.367098-1-dolinux.peng@gmail.com/
Signed-off-by: Donglin Peng <dolinux.peng@gmail.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
48 lines
931 B
Bash
48 lines
931 B
Bash
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Kprobe event char type argument
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# requires: kprobe_events
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case `uname -m` in
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x86_64)
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ARG1=%di
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;;
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i[3456]86)
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ARG1=%ax
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;;
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aarch64)
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ARG1=%x0
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;;
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arm*)
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ARG1=%r0
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;;
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ppc64*)
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ARG1=%r3
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;;
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ppc*)
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ARG1=%r3
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;;
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s390*)
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ARG1=%r2
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;;
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mips*)
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ARG1=%r4
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;;
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*)
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echo "Please implement other architecture here"
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exit_untested
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esac
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: "Test get argument (1)"
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echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):char" > kprobe_events
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echo 1 > events/kprobes/testprobe/enable
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echo "p:test $FUNCTION_FORK" >> kprobe_events
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grep -qe "testprobe.* arg1='t'" trace
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echo 0 > events/kprobes/testprobe/enable
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: "Test get argument (2)"
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echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):char arg2=+0(${ARG1}):char[4]" > kprobe_events
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echo 1 > events/kprobes/testprobe/enable
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echo "p:test $FUNCTION_FORK" >> kprobe_events
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grep -qe "testprobe.* arg1='t' arg2={'t','e','s','t'}" trace
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