43 lines
1.2 KiB
Awk
43 lines
1.2 KiB
Awk
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#!/bin/awk -f
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# Usage: objdump -d a.out | awk -f distill.awk | ./test_get_len
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# Distills the disassembly as follows:
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# - Removes all lines except the disassembled instructions.
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# - For instructions that exceed 1 line (7 bytes), crams all the hex bytes
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# into a single line.
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# - Remove bad(or prefix only) instructions
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BEGIN {
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prev_addr = ""
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prev_hex = ""
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prev_mnemonic = ""
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bad_expr = "(\\(bad\\)|^rex|^.byte|^rep(z|nz)$|^lock$|^es$|^cs$|^ss$|^ds$|^fs$|^gs$|^data(16|32)$|^addr(16|32|64))"
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fwait_expr = "^9b "
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fwait_str="9b\tfwait"
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}
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/^ *[0-9a-f]+:/ {
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if (split($0, field, "\t") < 3) {
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# This is a continuation of the same insn.
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prev_hex = prev_hex field[2]
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} else {
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# Skip bad instructions
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if (match(prev_mnemonic, bad_expr))
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prev_addr = ""
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# Split fwait from other f* instructions
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if (match(prev_hex, fwait_expr) && prev_mnemonic != "fwait") {
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printf "%s\t%s\n", prev_addr, fwait_str
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sub(fwait_expr, "", prev_hex)
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}
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if (prev_addr != "")
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printf "%s\t%s\t%s\n", prev_addr, prev_hex, prev_mnemonic
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prev_addr = field[1]
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prev_hex = field[2]
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prev_mnemonic = field[3]
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}
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}
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END {
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if (prev_addr != "")
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printf "%s\t%s\t%s\n", prev_addr, prev_hex, prev_mnemonic
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}
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