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Subject[RFC PATCH -tip 00/16] in-kernel x86 disassember

Here is a series of patches of the in-kernel x86 disassembler
for the latest tip tree.
This will show you a pretty disassembled code instead of
just a digital code sequence when you gets a kernel panic etc.
(I know, we also have script/decodecode for the panic use)

This feature is not for users, but mainly for kernel developers
who can understand disassembly code of x86 ;). This is just like
a joke feature in kernel. (yeah, I spend my spare time for this.
It's my fun :))

Currently, this can disassemble only most popular instructions
in-kernel, such as non-SSE, non-MMX, non-AVX, and so on, becuase
these extended instructions are rarely used in kernel :)
This series supports AT&T syntax, but not fully same as objdump.
Still it doesn't decode instruction suffix of operand size
(w,d,q etc).

The series is also hosted on a repository on GitHub,
you can get the latest version from below public repository.


This series adds below features:

- Debugfs disassembler interface for kernel function. You can disassemble
running kernel function on-line.
- Panic dump shows disassembly code instead of instruction byte stream.
It generates more human-readable report. (I strongly recommend you to
add a serial logger if it is enabled :))
- Disassemble command for KDB. 'dis' command is now available.
- User-land disassembly tool.

Thank you,


Masami Hiramatsu (16):
x86: Split default64 flag from force64 flag
x86: Change the order of segment prefix macro
x86: Add bogus disassembler support
x86: Show kernel symbol in disassembler
x86: Disassemble x86-64 only instructions
x86: Change asm syntax to AT&T-like one
kdb: Provide original instruction modified by sw breakpoint
x86/kprobes: Recover breakpoint instruction if KGDB knows
x86: kernel function disassembly interface
x86/disasm: Indicate modified instructions
tracing/docs: add explanation about disassembler interface
x86: Merge code dump in show_registers
x86: Disassemble support in register dump
x86: Indicate trapped address and probed address
x86/kdb: Add x86 disassembe command
tools/bogodis: Add bogus disassembler tool in userspace

Documentation/trace/kprobetrace.txt | 14 +
arch/x86/Kconfig.debug | 16 +
arch/x86/include/asm/disasm.h | 14 +
arch/x86/include/asm/inat.h | 38 ++
arch/x86/include/asm/insn.h | 16 +
arch/x86/include/asm/kdebug.h | 1
arch/x86/include/asm/kprobes.h | 2
arch/x86/kernel/dumpstack.c | 146 +++++++++
arch/x86/kernel/dumpstack_32.c | 26 --
arch/x86/kernel/dumpstack_64.c | 25 -
arch/x86/kernel/kdebugfs.c | 159 +++++++++
arch/x86/kernel/kgdb.c | 72 ++++
arch/x86/kernel/kprobes.c | 9 +
arch/x86/lib/Makefile | 18 +
arch/x86/lib/disasm.c | 508 ++++++++++++++++++++++++++++++
arch/x86/lib/insn.c | 2
arch/x86/lib/mnemonic.c | 96 ++++++
arch/x86/tools/gen-insn-attr-x86.awk | 7
arch/x86/tools/gen-insn-mnemonic-x86.awk | 352 +++++++++++++++++++++
include/linux/kdb.h | 3
include/linux/kgdb.h | 1
kernel/debug/debug_core.c | 14 +
kernel/debug/kdb/kdb_main.c | 35 ++
tools/bogodis/Makefile | 51 +++
tools/bogodis/bogodis.c | 202 ++++++++++++
25 files changed, 1759 insertions(+), 68 deletions(-)
create mode 100644 arch/x86/include/asm/disasm.h
create mode 100644 arch/x86/lib/disasm.c
create mode 100644 arch/x86/lib/mnemonic.c
create mode 100644 arch/x86/tools/gen-insn-mnemonic-x86.awk
create mode 100644 tools/bogodis/Makefile
create mode 100644 tools/bogodis/bogodis.c

Masami Hiramatsu <>

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