execve system call

[Carlos O'Donell]

On 3/26/07, Neo Jia <neojia@gmail.com> wrote:
> hi,
>
> I am trying to figure out the system call from user space to kernel
> space. So, I read glibc wrapper first. But I cannot figure out the
> exact meaning of INTERNAL_SYSCALL for execve system call on IA32 arch.
> In this macro, which function will be called by the following assmebly
> code ""call *%%gs:%P2\n\t"?
>
> Is there anyone can help me clarify it?

Yes.

1. Build the library
2. Look at the disassembled output for execve using objdump -ldr.

I would also recommend that you familiarize yourself with the GNU
Assembler http://sourceware.org/binutils/docs-2.17/as/index.html

Cheers,
Carlos.