jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
iotests: Add poke_file_[bl]e functions
Similarly to peek_file_[bl]e, we may want to write binary integers into
a file. Currently, this often means messing around with poke_file and
raw binary strings. I hope these functions make it a bit more
comfortable.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Code-suggested-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200324172757.1173824-3-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
+24
+24
tests/qemu-iotests/common.rc
+24
tests/qemu-iotests/common.rc
···
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printf "$3" | dd "of=$1" bs=1 "seek=$2" conv=notrunc &>/dev/null
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}
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# poke_file_le $img_filename $offset $byte_width $value
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# Example: poke_file_le "$TEST_IMG" 512 2 65534
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poke_file_le()
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{
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local img=$1 ofs=$2 len=$3 val=$4 str=''
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while ((len--)); do
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str+=$(printf '\\x%02x' $((val & 0xff)))
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val=$((val >> 8))
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done
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poke_file "$img" "$ofs" "$str"
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}
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# poke_file_be $img_filename $offset $byte_width $value
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# Example: poke_file_be "$TEST_IMG" 512 2 65279
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poke_file_be()
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{
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local img=$1 ofs=$2 len=$3 val=$4
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local str=$(printf "%0$((len * 2))x\n" $val | sed 's/\(..\)/\\x\1/g')
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poke_file "$img" "$ofs" "$str"
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}
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# peek_file_le 'test.img' 512 2 => 65534
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peek_file_le()
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{