// SPDX-License-Identifier: GPL-2.0
|
#include <linux/types.h>
|
#include <linux/string.h>
|
#include <limits.h>
|
#include <stdlib.h>
|
|
#include <internal/lib.h> // page_size
|
#include "../../../util/machine.h"
|
#include "../../../util/map.h"
|
#include "../../../util/symbol.h"
|
#include <linux/ctype.h>
|
|
#include <symbol/kallsyms.h>
|
|
#if defined(__x86_64__)
|
|
struct extra_kernel_map_info {
|
int cnt;
|
int max_cnt;
|
struct extra_kernel_map *maps;
|
bool get_entry_trampolines;
|
u64 entry_trampoline;
|
};
|
|
static int add_extra_kernel_map(struct extra_kernel_map_info *mi, u64 start,
|
u64 end, u64 pgoff, const char *name)
|
{
|
if (mi->cnt >= mi->max_cnt) {
|
void *buf;
|
size_t sz;
|
|
mi->max_cnt = mi->max_cnt ? mi->max_cnt * 2 : 32;
|
sz = sizeof(struct extra_kernel_map) * mi->max_cnt;
|
buf = realloc(mi->maps, sz);
|
if (!buf)
|
return -1;
|
mi->maps = buf;
|
}
|
|
mi->maps[mi->cnt].start = start;
|
mi->maps[mi->cnt].end = end;
|
mi->maps[mi->cnt].pgoff = pgoff;
|
strlcpy(mi->maps[mi->cnt].name, name, KMAP_NAME_LEN);
|
|
mi->cnt += 1;
|
|
return 0;
|
}
|
|
static int find_extra_kernel_maps(void *arg, const char *name, char type,
|
u64 start)
|
{
|
struct extra_kernel_map_info *mi = arg;
|
|
if (!mi->entry_trampoline && kallsyms2elf_binding(type) == STB_GLOBAL &&
|
!strcmp(name, "_entry_trampoline")) {
|
mi->entry_trampoline = start;
|
return 0;
|
}
|
|
if (is_entry_trampoline(name)) {
|
u64 end = start + page_size;
|
|
return add_extra_kernel_map(mi, start, end, 0, name);
|
}
|
|
return 0;
|
}
|
|
int machine__create_extra_kernel_maps(struct machine *machine,
|
struct dso *kernel)
|
{
|
struct extra_kernel_map_info mi = { .cnt = 0, };
|
char filename[PATH_MAX];
|
int ret;
|
int i;
|
|
machine__get_kallsyms_filename(machine, filename, PATH_MAX);
|
|
if (symbol__restricted_filename(filename, "/proc/kallsyms"))
|
return 0;
|
|
ret = kallsyms__parse(filename, &mi, find_extra_kernel_maps);
|
if (ret)
|
goto out_free;
|
|
if (!mi.entry_trampoline)
|
goto out_free;
|
|
for (i = 0; i < mi.cnt; i++) {
|
struct extra_kernel_map *xm = &mi.maps[i];
|
|
xm->pgoff = mi.entry_trampoline;
|
ret = machine__create_extra_kernel_map(machine, kernel, xm);
|
if (ret)
|
goto out_free;
|
}
|
|
machine->trampolines_mapped = mi.cnt;
|
out_free:
|
free(mi.maps);
|
return ret;
|
}
|
|
#endif
|
