1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/types.h> |
3 | #include <linux/string.h> |
4 | #include <limits.h> |
5 | #include <stdlib.h> |
6 | |
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> |
12 | |
13 | #include <symbol/kallsyms.h> |
14 | |
15 | #if defined(__x86_64__) |
16 | |
17 | struct { |
18 | int ; |
19 | int ; |
20 | struct extra_kernel_map *; |
21 | bool ; |
22 | u64 ; |
23 | }; |
24 | |
25 | static int (struct extra_kernel_map_info *mi, u64 start, |
26 | u64 end, u64 pgoff, const char *name) |
27 | { |
28 | if (mi->cnt >= mi->max_cnt) { |
29 | void *buf; |
30 | size_t sz; |
31 | |
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); |
35 | if (!buf) |
36 | return -1; |
37 | mi->maps = buf; |
38 | } |
39 | |
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); |
44 | |
45 | mi->cnt += 1; |
46 | |
47 | return 0; |
48 | } |
49 | |
50 | static int (void *arg, const char *name, char type, |
51 | u64 start) |
52 | { |
53 | struct extra_kernel_map_info *mi = arg; |
54 | |
55 | if (!mi->entry_trampoline && kallsyms2elf_binding(type) == STB_GLOBAL && |
56 | !strcmp(name, "_entry_trampoline" )) { |
57 | mi->entry_trampoline = start; |
58 | return 0; |
59 | } |
60 | |
61 | if (is_entry_trampoline(name)) { |
62 | u64 end = start + page_size; |
63 | |
64 | return add_extra_kernel_map(mi, start, end, pgoff: 0, name); |
65 | } |
66 | |
67 | return 0; |
68 | } |
69 | |
70 | int (struct machine *machine, |
71 | struct dso *kernel) |
72 | { |
73 | struct extra_kernel_map_info mi = { .cnt = 0, }; |
74 | char filename[PATH_MAX]; |
75 | int ret; |
76 | int i; |
77 | |
78 | machine__get_kallsyms_filename(machine, buf: filename, PATH_MAX); |
79 | |
80 | if (symbol__restricted_filename(filename, restricted_filename: "/proc/kallsyms" )) |
81 | return 0; |
82 | |
83 | ret = kallsyms__parse(filename, &mi, find_extra_kernel_maps); |
84 | if (ret) |
85 | goto out_free; |
86 | |
87 | if (!mi.entry_trampoline) |
88 | goto out_free; |
89 | |
90 | for (i = 0; i < mi.cnt; i++) { |
91 | struct extra_kernel_map *xm = &mi.maps[i]; |
92 | |
93 | xm->pgoff = mi.entry_trampoline; |
94 | ret = machine__create_extra_kernel_map(machine, kernel, xm); |
95 | if (ret) |
96 | goto out_free; |
97 | } |
98 | |
99 | machine->trampolines_mapped = mi.cnt; |
100 | out_free: |
101 | free(mi.maps); |
102 | return ret; |
103 | } |
104 | |
105 | #endif |
106 | |