Program runs with gdb but doesn't run with ./ProgramName

I am writing an editor in assembly 64bit mode in linux. It runs correctly when I debug the program in GDB but it does not run correctly when开发者_开发百科 I run it normally it means it has runtime errors when I use ./programName .

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You're probably accessing uninitialized data or have some kind of memory corruption problem. This would explain the program behaving differently when run in the debugger - you're seeing the results of undefined behavior.

Run your program through valgrind's memcheck tool and see what it outputs. Valgrind is a powerful tool that will identify many runtime errors on Linux, including a full stack trace to the error.

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If GDB disabling ASLR is what makes it work, perhaps set disable-randomization off in GDB will let your reproduce a crash inside GDB so you can debug it. Force gdb to load shared library at randomized address.

Otherwise enable core dumps from your program, and use GDB on the core dump.
gdb ./prog core.1234.

On x86, you can insert a ud2 instruction in your asm source to intentionally cause a crash at whatever point you want in your code, if you want to get a coredump to examine registers/memory at some point before it crashes on its own. All architectures have an undefined instruction you can use, but I only know the mnemonic for x86's off the top of my head.