int xen_build_id_check(const Elf_Note *n, unsigned int n_sz,
const void **p, unsigned int *len)
{
/* Check if we really have a build-id. */
ASSERT(n_sz > sizeof(*n));
if ( NT_GNU_BUILD_ID != n->type )
return -ENODATA;
if ( n->namesz + n->descsz < n->namesz )
return -EINVAL;
if ( n->namesz < 4 /* GNU\0 */)
return -EINVAL;
if ( n->namesz + n->descsz > n_sz - sizeof(*n) )
return -EINVAL;
/* Sanity check, name should be "GNU" for ld-generated build-id. */
if ( strncmp(ELFNOTE_NAME(n), "GNU", n->namesz) != 0 )
return -ENODATA;
if ( len )
*len = n->descsz;
if ( p )
*p = ELFNOTE_DESC(n);
return 0;
}
/* Save the registers in the per-cpu crash note buffer. */
void kexec_crash_save_cpu(void)
{
int cpu = smp_processor_id();
Elf_Note *note = per_cpu(crash_notes, cpu);
ELF_Prstatus *prstatus;
crash_xen_core_t *xencore;
if ( cpu_test_and_set(cpu, crash_saved_cpus) )
return;
prstatus = (ELF_Prstatus *)ELFNOTE_DESC(note);
note = ELFNOTE_NEXT(note);
xencore = (crash_xen_core_t *)ELFNOTE_DESC(note);
elf_core_save_regs(&prstatus->pr_reg, xencore);
}
/* Set up the single Xen-specific-info crash note. */
crash_xen_info_t *kexec_crash_save_info(void)
{
int cpu = smp_processor_id();
crash_xen_info_t info;
crash_xen_info_t *out = (crash_xen_info_t *)ELFNOTE_DESC(xen_crash_note);
BUG_ON(!cpu_test_and_set(cpu, crash_saved_cpus));
memset(&info, 0, sizeof(info));
info.xen_major_version = xen_major_version();
info.xen_minor_version = xen_minor_version();
info.xen_extra_version = __pa(xen_extra_version());
info.xen_changeset = __pa(xen_changeset());
info.xen_compiler = __pa(xen_compiler());
info.xen_compile_date = __pa(xen_compile_date());
info.xen_compile_time = __pa(xen_compile_time());
info.tainted = tainted;
/* Copy from guaranteed-aligned local copy to possibly-unaligned dest. */
memcpy(out, &info, sizeof(info));
return out;
}
