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/* { dg-do run } */
/* { dg-require-effective-target hwaddress_exec } */
/* { dg-additional-options "--param hwasan-random-frame-tag=1" } */
/* { dg-skip-if "" { *-*-* } { "-flto" } { "" } } */
#include <alloca.h>
/* This testcase checks that `alloca` calls ensure the `__hwasan_generate_tag`
function is called to initialize the base tag. `alloca` calls are treated
differently to standard variables. The prologue/epilogue sequence is
generated mainly based on normal stack-allocated objects.
We want to ensure that though the `alloca` call is not poisoned/unpoisoned
by the prologue and epilogue, the use of them in a given function still
triggers the prologue sequence to emit a call to __hwasan_generate_tag (and
hence that any call to __hwasan_generate_tag is emitted in the unconditional
part of the function code). */
int choice = 0;
int record = 1;
#ifdef __cplusplus
extern "C" {
#endif
__attribute__ ((noinline))
unsigned char
__hwasan_generate_tag ()
{
record = 0;
return 3;
}
#ifdef __cplusplus
}
#endif
__attribute__ ((noinline))
int
generate_tag_was_missed (void)
{
return record;
}
__attribute__((noinline, noclone)) int
foo (char *a)
{
int i, j = 0;
asm volatile ("" : "+r" (a) : : "memory");
for (i = 0; i < 12; i++)
j += a[i];
return j;
}
int
main ()
{
if (choice)
{
char *x = (char *)alloca(100);
foo(x);
}
else
{
char *y = (char *)alloca(20);
foo(y);
}
return generate_tag_was_missed ();
}
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