arch/x86/tools/distill.awk

   1 #!/bin/awk -f
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Usage: objdump -d a.out | awk -f distill.awk | ./test_get_len
   4 # Distills the disassembly as follows:
   5 # - Removes all lines except the disassembled instructions.
   6 # - For instructions that exceed 1 line (7 bytes), crams all the hex bytes
   7 # into a single line.
   8 # - Remove bad(or prefix only) instructions
   9
  10 BEGIN {
  11         prev_addr = ""
  12         prev_hex = ""
  13         prev_mnemonic = ""
  14         bad_expr = "(\\(bad\\)|^rex|^.byte|^rep(z|nz)$|^lock$|^es$|^cs$|^ss$|^ds$|^fs$|^gs$|^data(16|32)$|^addr(16|32|64))"
  15         fwait_expr = "^9b "
  16         fwait_str="9b\tfwait"
  17 }
  18
  19 /^ *[0-9a-f]+ <[^>]*>:/ {
  20         # Symbol entry
  21         printf("%s%s\n", $2, $1)
  22 }
  23
  24 /^ *[0-9a-f]+:/ {
  25         if (split($0, field, "\t") < 3) {
  26                 # This is a continuation of the same insn.
  27                 prev_hex = prev_hex field[2]
  28         } else {
  29                 # Skip bad instructions
  30                 if (match(prev_mnemonic, bad_expr))
  31                         prev_addr = ""
  32                 # Split fwait from other f* instructions
  33                 if (match(prev_hex, fwait_expr) && prev_mnemonic != "fwait") {
  34                         printf "%s\t%s\n", prev_addr, fwait_str
  35                         sub(fwait_expr, "", prev_hex)
  36                 }
  37                 if (prev_addr != "")
  38                         printf "%s\t%s\t%s\n", prev_addr, prev_hex, prev_mnemonic
  39                 prev_addr = field[1]
  40                 prev_hex = field[2]
  41                 prev_mnemonic = field[3]
  42         }
  43 }
  44
  45 END {
  46         if (prev_addr != "")
  47                 printf "%s\t%s\t%s\n", prev_addr, prev_hex, prev_mnemonic
  48 }