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/* externalvar test case
* Copyright (C) 2009, Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*
* Tests that an external exported variable can be accessed.
*/
#include <stdlib.h>
// function from our library
int lib_main (void);
struct exestruct
{
char c;
int i;
long l;
struct exestruct *s1;
struct exestruct *s2;
};
char exevar_c;
int exevar_i;
long exevar_l;
struct exestruct *exe_s;
static char stat_exevar_c;
static int stat_exevar_i;
static long stat_exevar_l;
static struct exestruct *stat_exe_s;
static void
main_call ()
{
asm (""); // dummy method, just to probe and extract and jump into lib.
lib_main ();
}
// We're using the asm() statement to make sure gcc doesn't optimize
// the variables away.
int
main ()
{
exevar_c = 42;
stat_exevar_c = exevar_c;
asm ("nop" : "=r"(stat_exevar_c) : "r"(stat_exevar_c));
exevar_i = 2;
stat_exevar_i = exevar_i;
asm ("nop" : "=r"(stat_exevar_i) : "r"(stat_exevar_i));
exevar_l = 21;
stat_exevar_l = exevar_l;
asm ("nop" : "=r"(stat_exevar_l) : "r"(stat_exevar_l));
exe_s = (struct exestruct *) malloc(sizeof(struct exestruct));
exe_s->i =1;
exe_s->l =2;
exe_s->c =3;
exe_s->s1 = NULL;
exe_s->s2 = exe_s;
stat_exe_s = exe_s;
asm ("nop" : "=r"(stat_exe_s) : "r"(stat_exe_s));
main_call ();
return 0;
}
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