This is an up-to-date libdasm fork. it's public domain.

updatesadded opcodes :

0xf6-0xf7 group 3 xx001xxx test 0xc0-0xc1 group 2 xx110xxx sal

fixes :

0xd9 0xd0-0xff fpu 0x8c mov segment register 0x0f 0xb6-0xb7 movzx

testlibdasm\examples>das test32.bin
00000000 d9e0 fchs
00000002 d9e1 fabs
00000004 90 nop
00000005 f60000 test byte [eax],0x0
00000008 f60800 test byte [eax],0x0
0000000b f70000000000 test dword [eax],0x0
00000011 f70800000000 test dword [eax],0x0
00000017 90 nop
00000018 8c00 mov [eax],es
0000001a 90 nop
0000001b 0fb700 movzx eax,[eax]
0000001e 0fb600 movzx eax,[eax]
00000021 0fb68000000000 movzx eax,[eax+0x0]
00000028 90 nop
00000029 c03000 sal byte [eax],0x0
0000002c c13000 sal dword [eax],0x0
0000002f 90 nop
...credits and linksthanks to :

Georg Wicherski Silvio Cesare Ero Carrera BeatriX and of course, jt, the original author of libdasm.

other disassembly engines:

Distorm64 BeaEngine libdisasm Hacker Disassembler Engine libdisassemble Udis86

documentation:

Intel AMD Sandpile.org x86 instruction reference