Re: c function call issue from assembly program

[Arpan Man Sainju]

Hello Nick,

Thank you for your response. 

Maybe the issue is only in Ubuntu 22.04

I was able to make it run in Ubuntu 22.04, by 

adding something to the stack (assuming stack alignment issue).

It works fine after that. 

Sample:

content of asm_program.asm:

.global main

.text
main:

    push %rbx
    mov $message, %rdi
    call c_function

    pop %rbx
    ret

.data
#where the message is stored
message: .ascii "Hello World\n\0"

I thought we don't have to get concerned with stack alignment with the new version of gnu.

Let me know if I am wrong.

Thank you again for your response.

Regards,

Arpan

On Thu, Sep 1, 2022 at 6:08 AM Nick Clifton <nickc@redhat.com> wrote:

Hi Arpan,

> I found this interesting issue in binutils v2.38.
> The following code works perfectly fine in ubuntu 20.04 (binutils v2.34)

I could not reproduce this failure.  That is when I compiled, assembled
and linked your test program using binutils 2.38 tools, the resulting
executable ran correctly.

I was however using Fedora rather than Ubuntu, so possibly the problem
is related to any Ubuntu specific changes that have been made to the
binutils sources.

Also when switching from Ubunti 20.04 to 22.04 it is likely that the
version of gcc has changed as well.  So possibly the problem is with
gcc rather than the binutils.

I suggest that you report the problem using the Ubuntu bug tracking
system.  They should be able to give you a more detailed answer.

Cheers
   Nick