25 Mar 2014
![X86 Assembly Cheat Sheet X86 Assembly Cheat Sheet](/uploads/1/1/8/3/118302668/989516810.jpg)
For GNU as on i386 I recommend this one: gcc x86 Assembly Quick Reference ('Cheat Sheet') Remember the length suffixes, covered here! The other one uses wide registers but doesn't use long operands. Improve this answer. Follow answered Mar 25 '12 at 22:15. Cheat sheet for reversing malicious Windows executables via static and dynamic code analysis. Overview of the Code Analysis Process 1. Examine static properties of the Windows executable for initial assessment and triage. Identify strings and API calls that highlight the program’s suspicious or malicious capabilities.
This post is just a little cheat sheet for myself on Intel & AT&T syntax.
How to be good at online blackjack poker. A useful table mapping some simple instructions between the two syntaxes linked through from the GCC-Inline-Assembly-HOWTO:
Intel Code | AT&T Code |
---|---|
mov eax,1 | movl $1,%eax |
mov ebx,0ffh | movl $0xff,%ebx |
int 80h | int $0x80 |
mov ebx, eax | movl %eax, %ebx |
mov eax,[ecx] | movl (%ecx),%eax |
mov eax,[ebx+3] | movl 3(%ebx),%eax |
mov eax,[ebx+20h] | movl 0x20(%ebx),%eax |
add eax,[ebx+ecx*2h] | addl (%ebx,%ecx,0x2),%eax |
lea eax,[ebx+ecx] | leal (%ebx,%ecx),%eax |
sub eax,[ebx+ecx*4h-20h] | subl -0x20(%ebx,%ecx,0x4),%eax |
Some important points to note:
- Source and destinations are flipped in opcodes.
- Intel is dest, src
- AT&T is src, dest
- AT&T decorates registers and immediates
- Registers are prefixed with a “%”
- Immediates are prefixed with a “$”. This applies to variables being passed in from C (when you’re inline).
- Intel decorates memory operands to denote the operand’s size, AT&T uses different mnemonics to accomplish the same.
- Intel syntax to dereference a memory location is “[ ]”. AT&T uses “( )”.
X86 Assembly Cheat Sheet
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The cheat sheet is intended for 32-bit Windows programming with FASM. One A4 page contains almost all general-purpose x86 instructions (except FPU, MMX and SSE instructions).
X86 Assembly Cheat Sheet
What is included
You will find various kinds of moves (MOV, CMOV, XCHG), arithmetical (ADD, SUB, MUL, DIV) and logical (AND, OR, XOR, NOT) instructions here. Several charts illustrate shifts (SHL/SHR, ROL/ROR, RCL/RCR) and stack frames. Code samples for typical high-level language constructs (if conditions, while and for loops, switches, function calls) are shown. Also included are quick references for RDTSC and CPUID instructions, description of string operations such as REP MOVSB, some code patterns for branchless conditions, a list of registers that should be saved in functions, and a lot of other useful stuff.
The idea is to put all reference information about x86 assembly language on the one page. Some rarely-used instructions such as LDS, BOUNDS or AAA are skipped.
Notation
The cheat sheet use common notation for operands: reg means register, [mem] means memory location, and imm is an immediate operand. Also, x, y, and z denote the first, the second, and the third operand. Atomic number 48. Instruction mnemonics are written in capital letters to make them easier to find when you are skipping through the cheat sheet.
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Example
For example, let's look at multiplication and division section. There are instructions for signed (IMUL) and unsigned (MUL) multiplication. Copy cloner. Both instructions take one operand, which may be register (reg) or memory ([mem]). There are three possible cases:
- If operand size is one byte, MUL or IMUL multiplies it by al and stores the result in ax
- If operand size is a word, MUL or IMUL multiplies it by ax and stores the high-order word of the result in dx and the low-order word in ax.
- If operand size is a double word, MUL or IMUL multiplies it by eax and stores the high-order dword in edx and the low-order dword in eax.
X64 Assembly Tutorial
There are also two-operand and three-operand forms of IMUL shown on the figure above.
Intel X86 Assembly Cheat Sheet
Other features of assembly language are described in a similar way.
![X86 Assembly Cheat Sheet X86 Assembly Cheat Sheet](/uploads/1/1/8/3/118302668/989516810.jpg)
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The cheat sheet is designed for A4 page size; if you print it on US Letter paper, you will get large margins. You can print the cheat sheet and put it on your table to look for some instructions when you forget them.
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Serbo-Croatian translation of this article by WHG Team.