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selftests: ftrace: Add probe event argument syntax testcase
Add a testcase for probe event argument syntax which ensures the kprobe_events interface correctly parses given event arguments. Link: http://lkml.kernel.org/r/152129033679.31874.12705519603869152799.stgit@devbox Signed-off-by: Masami Hiramatsu <[email protected]> Signed-off-by: Steven Rostedt (VMware) <[email protected]>
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tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc
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| #!/bin/sh | ||
| # SPDX-License-Identifier: GPL-2.0 | ||
| # description: Kprobe event argument syntax | ||
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| [ -f kprobe_events ] || exit_unsupported # this is configurable | ||
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| grep "x8/16/32/64" README > /dev/null || exit_unsupported # version issue | ||
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| echo 0 > events/enable | ||
| echo > kprobe_events | ||
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| PROBEFUNC="vfs_read" | ||
| GOODREG= | ||
| BADREG= | ||
| GOODSYM="_sdata" | ||
| if ! grep -qw ${GOODSYM} /proc/kallsyms ; then | ||
| GOODSYM=$PROBEFUNC | ||
| fi | ||
| BADSYM="deaqswdefr" | ||
| SYMADDR=0x`grep -w ${GOODSYM} /proc/kallsyms | cut -f 1 -d " "` | ||
| GOODTYPE="x16" | ||
| BADTYPE="y16" | ||
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| case `uname -m` in | ||
| x86_64|i[3456]86) | ||
| GOODREG=%ax | ||
| BADREG=%ex | ||
| ;; | ||
| aarch64) | ||
| GOODREG=%x0 | ||
| BADREG=%ax | ||
| ;; | ||
| arm*) | ||
| GOODREG=%r0 | ||
| BADREG=%ax | ||
| ;; | ||
| esac | ||
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| test_goodarg() # Good-args | ||
| { | ||
| while [ "$1" ]; do | ||
| echo "p ${PROBEFUNC} $1" > kprobe_events | ||
| shift 1 | ||
| done; | ||
| } | ||
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| test_badarg() # Bad-args | ||
| { | ||
| while [ "$1" ]; do | ||
| ! echo "p ${PROBEFUNC} $1" > kprobe_events | ||
| shift 1 | ||
| done; | ||
| } | ||
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| echo > kprobe_events | ||
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| : "Register access" | ||
| test_goodarg ${GOODREG} | ||
| test_badarg ${BADREG} | ||
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| : "Symbol access" | ||
| test_goodarg "@${GOODSYM}" "@${SYMADDR}" "@${GOODSYM}+10" "@${GOODSYM}-10" | ||
| test_badarg "@" "@${BADSYM}" "@${GOODSYM}*10" "@${GOODSYM}/10" \ | ||
| "@${GOODSYM}%10" "@${GOODSYM}&10" "@${GOODSYM}|10" | ||
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| : "Stack access" | ||
| test_goodarg "\$stack" "\$stack0" "\$stack1" | ||
| test_badarg "\$stackp" "\$stack0+10" "\$stack1-10" | ||
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| : "Retval access" | ||
| echo "r ${PROBEFUNC} \$retval" > kprobe_events | ||
| ! echo "p ${PROBEFUNC} \$retval" > kprobe_events | ||
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| : "Comm access" | ||
| test_goodarg "\$comm" | ||
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| : "Indirect memory access" | ||
| test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \ | ||
| "+0(\$stack1)" "+10(@${GOODSYM}-10)" "+0(+10(+20(\$stack)))" | ||
| test_badarg "+(${GOODREG})" "(${GOODREG}+10)" "-(${GOODREG})" "(${GOODREG})" \ | ||
| "+10(\$comm)" "+0(${GOODREG})+10" | ||
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| : "Name assignment" | ||
| test_goodarg "varname=${GOODREG}" | ||
| test_badarg "varname=varname2=${GOODREG}" | ||
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| : "Type syntax" | ||
| test_goodarg "${GOODREG}:${GOODTYPE}" | ||
| test_badarg "${GOODREG}::${GOODTYPE}" "${GOODREG}:${BADTYPE}" \ | ||
| "${GOODTYPE}:${GOODREG}" | ||
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| : "Combination check" | ||
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| test_goodarg "\$comm:string" "+0(\$stack):string" | ||
| test_badarg "\$comm:x64" "\$stack:string" "${GOODREG}:string" | ||
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| echo > kprobe_events |