1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/types.h>
3 #include <linux/string.h>
7 #include <internal/lib.h> // page_size
8 #include "../../../util/machine.h"
9 #include "../../../util/map.h"
10 #include "../../../util/symbol.h"
11 #include <linux/ctype.h>
13 #include <symbol/kallsyms.h>
15 #if defined(__x86_64__)
17 struct extra_kernel_map_info {
20 struct extra_kernel_map *maps;
21 bool get_entry_trampolines;
25 static int add_extra_kernel_map(struct extra_kernel_map_info *mi, u64 start,
26 u64 end, u64 pgoff, const char *name)
28 if (mi->cnt >= mi->max_cnt) {
32 mi->max_cnt = mi->max_cnt ? mi->max_cnt * 2 : 32;
33 sz = sizeof(struct extra_kernel_map) * mi->max_cnt;
34 buf = realloc(mi->maps, sz);
40 mi->maps[mi->cnt].start = start;
41 mi->maps[mi->cnt].end = end;
42 mi->maps[mi->cnt].pgoff = pgoff;
43 strlcpy(mi->maps[mi->cnt].name, name, KMAP_NAME_LEN);
50 static int find_extra_kernel_maps(void *arg, const char *name, char type,
53 struct extra_kernel_map_info *mi = arg;
55 if (!mi->entry_trampoline && kallsyms2elf_binding(type) == STB_GLOBAL &&
56 !strcmp(name, "_entry_trampoline")) {
57 mi->entry_trampoline = start;
61 if (is_entry_trampoline(name)) {
62 u64 end = start + page_size;
64 return add_extra_kernel_map(mi, start, end, 0, name);
70 int machine__create_extra_kernel_maps(struct machine *machine,
73 struct extra_kernel_map_info mi = { .cnt = 0, };
74 char filename[PATH_MAX];
78 machine__get_kallsyms_filename(machine, filename, PATH_MAX);
80 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
83 ret = kallsyms__parse(filename, &mi, find_extra_kernel_maps);
87 if (!mi.entry_trampoline)
90 for (i = 0; i < mi.cnt; i++) {
91 struct extra_kernel_map *xm = &mi.maps[i];
93 xm->pgoff = mi.entry_trampoline;
94 ret = machine__create_extra_kernel_map(machine, kernel, xm);
99 machine->trampolines_mapped = mi.cnt;