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#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <elf.h>
#include "kexec.h"
#include "kexec-syscall.h"
#include "crashdump.h"
#include "config.h"
#ifdef HAVE_LIBXENCTRL
#include "kexec-xen.h"
#include "crashdump.h"
#ifdef CONFIG_LIBXENCTRL_DL
#include <dlfcn.h>
/* The handle from dlopen(), needed by dlsym(), dlclose() */
static void *xc_dlhandle;
xc_hypercall_buffer_t XC__HYPERCALL_BUFFER_NAME(HYPERCALL_BUFFER_NULL);
void *__xc_dlsym(const char *symbol)
{
return dlsym(xc_dlhandle, symbol);
}
xc_interface *__xc_interface_open(xentoollog_logger *logger,
xentoollog_logger *dombuild_logger,
unsigned open_flags)
{
xc_interface *xch = NULL;
if (!xc_dlhandle)
xc_dlhandle = dlopen("libxenctrl.so", RTLD_NOW | RTLD_NODELETE);
if (xc_dlhandle) {
typedef xc_interface *(*func_t)(xentoollog_logger *logger,
xentoollog_logger *dombuild_logger,
unsigned open_flags);
func_t func = (func_t)dlsym(xc_dlhandle, "xc_interface_open");
xch = func(logger, dombuild_logger, open_flags);
}
return xch;
}
int __xc_interface_close(xc_interface *xch)
{
int rc = -1;
if (xc_dlhandle) {
typedef int (*func_t)(xc_interface *xch);
func_t func = (func_t)dlsym(xc_dlhandle, "xc_interface_close");
rc = func(xch);
dlclose(xc_dlhandle);
xc_dlhandle = NULL;
}
return rc;
}
#endif /* CONFIG_LIBXENCTRL_DL */
int xen_kexec_load(struct kexec_info *info)
{
uint32_t nr_segments = info->nr_segments;
struct kexec_segment *segments = info->segment;
xc_interface *xch;
xc_hypercall_buffer_array_t *array = NULL;
uint8_t type;
uint8_t arch;
xen_kexec_segment_t *xen_segs;
int s;
int ret = -1;
xch = xc_interface_open(NULL, NULL, 0);
if (!xch)
return -1;
xen_segs = calloc(nr_segments + 1, sizeof(*xen_segs));
if (!xen_segs)
goto out;
array = xc_hypercall_buffer_array_create(xch, nr_segments);
if (array == NULL)
goto out;
for (s = 0; s < nr_segments; s++) {
DECLARE_HYPERCALL_BUFFER(void, seg_buf);
seg_buf = xc_hypercall_buffer_array_alloc(xch, array, s,
seg_buf, segments[s].bufsz);
if (seg_buf == NULL)
goto out;
memcpy(seg_buf, segments[s].buf, segments[s].bufsz);
set_xen_guest_handle(xen_segs[s].buf.h, seg_buf);
xen_segs[s].buf_size = segments[s].bufsz;
xen_segs[s].dest_maddr = (uint64_t)segments[s].mem;
xen_segs[s].dest_size = segments[s].memsz;
}
/*
* Ensure 0 - 1 MiB is mapped and accessible by the image.
*
* This allows access to the VGA memory and the region
* purgatory copies in the crash case.
*/
set_xen_guest_handle(xen_segs[s].buf.h, HYPERCALL_BUFFER_NULL);
xen_segs[s].buf_size = 0;
xen_segs[s].dest_maddr = 0;
xen_segs[s].dest_size = 1 * 1024 * 1024;
nr_segments++;
type = (info->kexec_flags & KEXEC_ON_CRASH) ? KEXEC_TYPE_CRASH
: KEXEC_TYPE_DEFAULT;
arch = (info->kexec_flags & KEXEC_ARCH_MASK) >> 16;
#if defined(__i386__) || defined(__x86_64__)
if (!arch)
arch = EM_386;
#endif
ret = xc_kexec_load(xch, type, arch, (uint64_t)info->entry,
nr_segments, xen_segs);
out:
xc_hypercall_buffer_array_destroy(xch, array);
free(xen_segs);
xc_interface_close(xch);
return ret;
}
int xen_kexec_unload(uint64_t kexec_flags)
{
xc_interface *xch;
uint8_t type;
int ret;
xch = xc_interface_open(NULL, NULL, 0);
if (!xch)
return -1;
type = (kexec_flags & KEXEC_ON_CRASH) ? KEXEC_TYPE_CRASH
: KEXEC_TYPE_DEFAULT;
ret = xc_kexec_unload(xch, type);
xc_interface_close(xch);
return ret;
}
int xen_kexec_status(uint64_t kexec_flags)
{
xc_interface *xch;
uint8_t type;
int ret = -1;
#ifdef HAVE_KEXEC_CMD_STATUS
xch = xc_interface_open(NULL, NULL, 0);
if (!xch)
return -1;
type = (kexec_flags & KEXEC_ON_CRASH) ? KEXEC_TYPE_CRASH : KEXEC_TYPE_DEFAULT;
ret = xc_kexec_status(xch, type);
xc_interface_close(xch);
#endif
return ret;
}
void xen_kexec_exec(void)
{
xc_interface *xch;
xch = xc_interface_open(NULL, NULL, 0);
if (!xch)
return;
xc_kexec_exec(xch, KEXEC_TYPE_DEFAULT);
xc_interface_close(xch);
}
#else /* ! HAVE_LIBXENCTRL */
int xen_kexec_load(struct kexec_info *UNUSED(info))
{
return -1;
}
int xen_kexec_unload(uint64_t kexec_flags)
{
return -1;
}
int xen_kexec_status(uint64_t kexec_flags)
{
return -1;
}
void xen_kexec_exec(void)
{
}
#endif
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