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A family of very low-level programming languages, just above machine code, where each statement corresponds to a single machine code instruction.

2
votes
1answer
I am analyzing a sequence of x86 instructions, and become confused with the following code: 135328495: sbb edx, edx 135328497: neg edx 135328499: test edx, edx 135328503: jz 0x810f31c I understand …
asked Dec 8 '16 by lllllllllllll
1
vote
1answer
I am on the hook to analysis some "timing channels" of some x86 binary code. I am posting one question to comprehend bsf/bsr opcode. So high-levelly, these two opcodes can be modeled as a "loop", whi …
asked Feb 4 '19 by lllllllllllll
1
vote
1answer
Here is my question: given a marked C code component, how I can find its corresponding assembly instructions in the compiler produced assembly program? … It should be very easy if the marked component is a function, as long as there is no overlapped assembly program, we can just do a linear search and recognize the function in the compiler-produced code …
asked May 26 '16 by lllllllllllll
4
votes
1answer
The test platform is on Linux 32bit, x86. So basically I wrote a simple C program like this: void main() { double a = 10.0; printf("hello world %f\n", a); } I use gcc to compile t …
asked Apr 16 '14 by lllllllllllll
3
votes
3answers
So by reading this rop paper from Dr. Shacham, I know that it is not very hard to find gadgets set that has Turning-complete computation ability. So I am thinking that, in theoretical, are all the as …
asked Apr 9 '14 by lllllllllllll
3
votes
2answers
So basically I am using objdump to disassemble a binary from `GNU Coreutils", on 32 bit Linux x86. In the disassembled code, I found one "broken" instruction like this: 804bb49: 8d 04 ed 00 00 00 …
asked May 8 '14 by lllllllllllll
6
votes
2answers
OK, so basically I want to re-use the content from dumped .rodata data and bss section from ELF on Linux 32bit. The dump command: objdump -s -j .text elf_binary objdump -s -j .rodata elf_binary objd …
asked May 2 '14 by lllllllllllll
1
vote
thanks @yaspr for his excellent answer. So in this post I was asking that How to re-use .rodata .data and .bss sections' contents? Here is my answer: you can quickly go this way once you dumped a …
answered May 2 '14 by lllllllllllll
1
vote
1answer
Basically I am doing some binary manipulation work on ELF binaries, and what I have to do now is to assemble a assembly program and guarantee the libc symbols are loaded to a predefined address by me. …
asked Feb 5 '15 by lllllllllllll
2
votes
1answer
Basically I am trying to re-use some asm code disassembled from a binary on x86 32bit Linux. I am facing some trouble when references of GOT/GOT.PLT involved like these. .... 804c460: 53 …
asked Jul 1 '14 by lllllllllllll
1
vote
1answer
the test is on 32-bit x86. I compiled the code with gcc 4.2, optimization level o2. I compiled the C code into binary, and then use objdump to disassemble it. Here are two sequences of instructions u …
asked Sep 25 '15 by lllllllllllll
1
vote
0answers
I defined a new code section in my assembly program, which is going to be compiled into 32-bit ELF binary, on x86. … I just want to add a new executable section to my assembly program, and assign a fixed address to this new section. So am I on the right way now? …
asked Feb 10 '15 by lllllllllllll
10
votes
2answers
So basically I am writing some code to do analysis work on disassembled assembly code. …
asked Jul 31 '14 by lllllllllllll
3
votes
3answers
So basically I am using objdump on 32 bit x86 Linux, disassembling some static linked binary compiled by gcc In the disassembled asm code, I find this: 80ade23: 74 01 je …
asked Jul 7 '14 by lllllllllllll
3
votes
1answer
So basically I am trying to re-use some assembly code/data dumped by objdump from 32 bit ELF binary on Linux. …
asked May 10 '14 by lllllllllllll

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