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# Check that implicitly-saved $target variables have the same
# value as those manually saved on entry.
# saved individual parameters
global read_file
global read_file_mode
global read_buf
global read_count
global read_pos
# the saved string $$parms
global read_parms
# error count
global errors
probe begin
{
println("systemtap starting probe")
}
function check_num(name, ent, ret)
{
if (ent != ret) {
printf("%s mismatch, entry:%#x vs. return:%#x\n", name, ent, ret)
errors++
}
}
function check_str(name, ent, ret)
{
if (ent != ret) {
printf("%s mismatch, entry:'%s' vs. return:'%s'\n", name, ent, ret)
errors++
}
}
probe kernel.function("vfs_read").call
{
if (tid() != target())
next
read_file = $file
read_file_mode = $file->f_mode
read_buf = $buf
read_count = $count
read_pos = $pos
read_parms = $$parms
}
probe kernel.function("vfs_read").return
{
if (tid() != target())
next
println("systemtap ending probe")
check_num("file", read_file, $file)
check_num("file->f_mode", read_file_mode, $file->f_mode)
check_num("buf", read_buf, $buf)
check_num("count", read_count, $count)
check_num("pos", read_pos, $pos)
check_str("parms", read_parms, $$parms)
if (!errors)
println("systemtap test success")
exit()
}
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