MIsc C programming questions

MIsc C programming questions

[fabio]

Hello,

I have some questions about C programming not exactly on Linux but
Solaris, I hope you can help me:

- Why I cant include this __asm___ lines on a C program and compile it
on Sun cc on Solaris 10?

-bash-3.00$ cat ret.c; cc ret.c
/*

*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/systeminfo.h>


/*
*
*/
int
main() {
    int ret;
    ret = get_sp();
    printf("Stack Pointer is: 0x%x\n",ret);
    char platform[257],release[257];
    sysinfo(SI_PLATFORM, platform, sizeof(platform) - 1);
    sysinfo(SI_RELEASE, release, sizeof(release) - 1);
    printf("Platform: %s (%s)\n", platform, release);
    return (EXIT_SUCCESS);
}

int
get_sp(){
    __asm__("mov %sp,%g1");
    __asm__("mov %g1,%o1");
}
"ret.c", line 16: warning: implicit function declaration: get_sp
"ret.c", line 27: warning: implicit function declaration: __asm__
Undefined                       first referenced
symbol                             in file
__asm__                             ret.o
ld: fatal: Symbol referencing errors. No output written to a.out
-bash-3.00$

Any workaround?

Thanks

Re: MIsc C programming questions

[Steve Graegert]

On 10/24/05, fabio <fabio@crearium.com> wrote:
> Hello,
>
> I have some questions about C programming not exactly on Linux but
> Solaris, I hope you can help me:
>
> - Why I cant include this __asm___ lines on a C program and compile it
> on Sun cc on Solaris 10?

Because Sun's C compiler doesn't support __asm__ which is a GNU extension.

> Any workaround?

Use the asm keyword instead:

	asm("mov %sp,%g1");
	asm("mov %g1,%o1");

Does it help?

	\Steve