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