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/*
* Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
*
*/
#include <xen/types.h>
#include <asm/alternative.h>
#include <asm/livepatch.h>
#ifdef CONFIG_X86
#include <asm/nops.h>
#include <asm/uaccess.h>
static unsigned long *non_canonical_addr = (unsigned long *)0xdead000000000000ULL;
#endif
/* Our replacement function for xen_extra_version. */
const char *xen_hello_world(void)
{
#ifdef CONFIG_X86
unsigned long tmp;
int rc;
alternative(ASM_NOP8, ASM_NOP1, LIVEPATCH_FEATURE);
/*
* Any BUG, or WARN_ON will contain symbol and payload name. Furthermore
* exceptions will be caught and processed properly.
*/
rc = get_unsafe(tmp, non_canonical_addr);
BUG_ON(rc != -EFAULT);
#endif
#if defined(CONFIG_ARM)
asm(ALTERNATIVE("nop", "nop", LIVEPATCH_FEATURE));
#endif
return "Hello World";
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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