03-15-2019
I understood correctly?
On a 64-bit system without parameters, the code gives "Segmentation fault".
Is there no " Segmentation fault" on the 32-bit system when started without parameters?
If my assumptions are correct, when creating a stack in the "main" function of the 64-bit system, a layer in the form of a red zone from the previous stack is filled with machine zeros and the parameters get no value, which leads to segmentation. And when creating a frame in the 32-bit system of this red zone is not! And the garbage from the old frame gets into the parameters and therefore there is no segmentation. But this is still not correct.
P.S. Thanks "Auto Save Recovery" accidentally closed the tab.
--- Post updated at 21:03 ---
I apologize this line should be read like this
Quote:
Is there no " Segmentation fault" on the 32-bit system when started without parameters?
There is no " Segmentation fault" on the 32-bit system when started without parameters
Last edited by nezabudka; 03-15-2019 at 02:54 PM..
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OUTB(2) Linux Programmer's Manual OUTB(2)
NAME
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
DESCRIPTION
This family of functions is used to do low-level port input and output. The out* functions do port output, the in* functions do port
input; the b-suffix functions are byte-width and the w-suffix functions word-width; the _p-suffix functions pause until the I/O completes.
They are primarily designed for internal kernel use, but can be used from user space.
You compile with -O or -O2 or similar. The functions are defined as inline macros, and will not be substituted in without optimization
enabled, causing unresolved references at link time.
You use ioperm(2) or alternatively iopl(2) to tell the kernel to allow the user space application to access the I/O ports in question.
Failure to do this will cause the application to receive a segmentation fault.
CONFORMING TO
outb() and friends are hardware-specific. The value argument is passed first and the port argument is passed second, which is the opposite
order from most DOS implementations.
SEE ALSO
ioperm(2), iopl(2)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 1995-11-29 OUTB(2)