1 files changed, 42 insertions, 0 deletions

diff --git a/arch/x86/tools/distill.awk b/arch/x86/tools/distill.awk
new file mode 100644
index 000000000000..d433619bb866
--- /dev/null
+++ b/arch/x86/tools/distill.awk
@@ -0,0 +1,42 @@
+#!/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]+:/ {
+        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
+}