Question

I know of otool -tv, but I would much rather use the Intel syntax rather than AT&Ts, mainly to easily follow along in a book and not have to look over thousands of % s and $ s.

I d also appreciate any tips to where I might find gdb s config file.

EDIT: I forgot: I m running a 64bit processor, but was wondering if it would be possible to also disassemble into 32 bit assembly? Not only that, but does OSX s gdb s list command work differently than the standard GNU version?

Thanks so much!

(Also, if you have any idea where I might find a little disassembler from C -> MIPS, that d be very fun to play with. But not necessary!)

Answer 1

To answer your second question, if the code has been compiled into a fat binary with both 64-bit and 32-bit, you can use otool -arch i386 -tv to disassemble the 32-bit slice of the binary; otool -arch x86_64 -tv will give you the 64-bit portion (on SnowLeopard, this is also the default behavior if no -arch flag is passed).

Also note that while otool doesn t support the Intel syntax, gdb (set disassembly-flavor intel) and XCode (Preferences -> Debugging -> Disassembly Style) do.

Answer 2

(I know this is an old question, but I want to provide an updated answer for people who come here through search engines).

On recent versions of macOS (I m running 10.14.5), an objdump command is available, which is based on LLVM and is not the one from the GNU project. It offers a (hidden) option to disassemble using Intel syntax. For example, /bin/echo can be disassembled as follows:

objdump -disassemble -x86-asm-syntax=intel /bin/echo

Answer 3

With Objdump you can disassemble with -d -M intel, and apparently -m can be used to specify the architecture.

Answer 4

For GDB, in your .gdbinit file, add:

set disassembly-flavor intel

then it will be the default syntax for gdb.

Answer 5

You can use A2I to translate from AT&T to Intel syntax: http://membres.lycos.fr/placr/a2i.html

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