gdbgui | Add breakpoints | Code Inspection library
kandi X-RAY | gdbgui Summary
kandi X-RAY | gdbgui Summary
Browser-based frontend to gdb (gnu debugger). Add breakpoints, view the stack, visualize data structures, and more in C, C++, Go, Rust, and Fortran. Run gdbgui from the terminal and a new tab will open in your browser.
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QUESTION
To better understand assembly, I compiled a simple C++ program using g++ and then used gdbgui to step through the execution. I made a graphic of the state of the stack and registers at several consecutive points in the program to help myself better understand exactly what was going on. It appears that the program writes/reads at memory beyond the stack pointer several times during execution. This surprised me. I was under the impression that a program should never write beyond the stack pointer. I understand how it works, the relative addressing is based off of the base pointer, but I would've expected the program to adjust the stack pointer in some way to encompass the memory it planned on using. Is this method of writing beyond the stack a common technique for compilers?
C++:
...ANSWER
Answered 2020-Apr-08 at 23:24On x86-64 under the SysV ABI, it is legal for a function to write up to 128 bytes below the stack pointer; see Section 3.2.2. This area is known as the red zone. Any sort of asynchronous code that might use the same stack is required to leave those 128 bytes alone.
QUESTION
I'm coding in x86 assembly (AT&T syntax) on 64-bit Ubuntu (so I'm using as --32
and ld -melf_i386
, which has been working fine for other exercises so far).
The jl
instruction is working opposite to what I expected. I can actually get the code to work properly with jg
, which would basically solve my problem, but I'd like to find out the underlying issue here.
The code snippet is the following:
...ANSWER
Answered 2017-Dec-11 at 13:49In AT&T syntax, the order of operands is exchanged compared to Intel syntax. For this reason,
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