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Date: Wed, 19 Feb 2014 13:57:00 -0000
Message-ID: <CAGqvRw5VEE3So5CWGuZKf0YCOtYSiAAKr4+YwjYjKk9NaJGe8w@mail.gmail.com>
Subject: Moving C++ code to a different ELF section
From: Saul Tamari <stamari@gmail.com>
To: gcc-help@gcc.gnu.org
Content-Type: text/plain; charset=ISO-8859-1
X-SW-Source: 2014-02/txt/msg00107.txt.bz2

Hi,

I'm trying to move some C++ code to a different ELF section and am
facing some errors which I don't understand. I'm using g++ v4.8.1 on
x86.

When compiling the following code I'm getting these errors:
/tmp/ccpp2AkE.s: Assembler messages:
/tmp/ccpp2AkE.s:63: Error: CFI instruction used without previous .cfi_startproc
/tmp/ccpp2AkE.s:64: Error: CFI instruction used without previous .cfi_startproc
/tmp/ccpp2AkE.s:66: Error: .cfi_endproc without corresponding .cfi_startproc
/tmp/ccpp2AkE.s: Error: open CFI at the end of file; missing
.cfi_endproc directive


The source is:
#include <iostream>
#include <stdlib.h>

int qqq;

int main(int argc, char* argv[])
{
        std::cout << "hey " << std::endl;

        qqq = rand();
        if (qqq > 0x1000000) {
                asm volatile ("jmp 1f \n\t  .pushsection
__kuku,\"ax\",@progbits \n\t 1:");
                std::cout << "0x123456" << std::endl;
                throw 12345;
                asm volatile("jmp 3f \n\t .popsection  \n\t 3:");
        }

        return 0;
}


What do these errors mean? Is there a way to fix them? Is there an
alternate method to move similar code to a different section?


Thanks,
Saul