1 #include <linux/compiler.h>
2 #include <linux/rbtree.h>
11 static int vmlinux_matches_kallsyms_filter(struct map
*map __maybe_unused
,
14 bool *visited
= symbol__priv(sym
);
19 #define UM(x) kallsyms_map->unmap_ip(kallsyms_map, (x))
21 int test__vmlinux_matches_kallsyms(int subtest __maybe_unused
)
26 struct map
*kallsyms_map
, *vmlinux_map
, *map
;
27 struct machine kallsyms
, vmlinux
;
28 enum map_type type
= MAP__FUNCTION
;
29 struct maps
*maps
= &vmlinux
.kmaps
.maps
[type
];
30 u64 mem_start
, mem_end
;
35 * Init the machines that will hold kernel, modules obtained from
36 * both vmlinux + .ko files and from /proc/kallsyms split by modules.
38 machine__init(&kallsyms
, "", HOST_KERNEL_ID
);
39 machine__init(&vmlinux
, "", HOST_KERNEL_ID
);
44 * Create the kernel maps for kallsyms and the DSO where we will then
45 * load /proc/kallsyms. Also create the modules maps from /proc/modules
46 * and find the .ko files that match them in /lib/modules/`uname -r`/.
48 if (machine__create_kernel_maps(&kallsyms
) < 0) {
49 pr_debug("machine__create_kernel_maps ");
56 * Load and split /proc/kallsyms into multiple maps, one per module.
57 * Do not use kcore, as this test was designed before kcore support
58 * and has parts that only make sense if using the non-kcore code.
59 * XXX: extend it to stress the kcorre code as well, hint: the list
60 * of modules extracted from /proc/kcore, in its current form, can't
61 * be compacted against the list of modules found in the "vmlinux"
62 * code and with the one got from /proc/modules from the "kallsyms" code.
64 if (__machine__load_kallsyms(&kallsyms
, "/proc/kallsyms", type
, true, NULL
) <= 0) {
65 pr_debug("dso__load_kallsyms ");
72 * kallsyms will be internally on demand sorted by name so that we can
73 * find the reference relocation * symbol, i.e. the symbol we will use
74 * to see if the running kernel was relocated by checking if it has the
75 * same value in the vmlinux file we load.
77 kallsyms_map
= machine__kernel_map(&kallsyms
);
82 * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
84 if (machine__create_kernel_maps(&vmlinux
) < 0) {
85 pr_debug("machine__create_kernel_maps ");
89 vmlinux_map
= machine__kernel_map(&vmlinux
);
94 * Locate a vmlinux file in the vmlinux path that has a buildid that
95 * matches the one of the running kernel.
97 * While doing that look if we find the ref reloc symbol, if we find it
98 * we'll have its ref_reloc_symbol.unrelocated_addr and then
99 * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
100 * to fixup the symbols.
102 if (machine__load_vmlinux_path(&vmlinux
, type
,
103 vmlinux_matches_kallsyms_filter
) <= 0) {
104 pr_debug("Couldn't find a vmlinux that matches the kernel running on this machine, skipping test\n");
113 * Now look at the symbols in the vmlinux DSO and check if we find all of them
114 * in the kallsyms dso. For the ones that are in both, check its names and
117 for (nd
= rb_first(&vmlinux_map
->dso
->symbols
[type
]); nd
; nd
= rb_next(nd
)) {
118 struct symbol
*pair
, *first_pair
;
120 sym
= rb_entry(nd
, struct symbol
, rb_node
);
122 if (sym
->start
== sym
->end
)
125 mem_start
= vmlinux_map
->unmap_ip(vmlinux_map
, sym
->start
);
126 mem_end
= vmlinux_map
->unmap_ip(vmlinux_map
, sym
->end
);
128 first_pair
= machine__find_kernel_symbol(&kallsyms
, type
,
129 mem_start
, NULL
, NULL
);
132 if (pair
&& UM(pair
->start
) == mem_start
) {
134 if (strcmp(sym
->name
, pair
->name
) == 0) {
136 * kallsyms don't have the symbol end, so we
137 * set that by using the next symbol start - 1,
138 * in some cases we get this up to a page
139 * wrong, trace_kmalloc when I was developing
140 * this code was one such example, 2106 bytes
141 * off the real size. More than that and we
142 * _really_ have a problem.
144 s64 skew
= mem_end
- UM(pair
->end
);
145 if (llabs(skew
) >= page_size
)
146 pr_debug("%#" PRIx64
": diff end addr for %s v: %#" PRIx64
" k: %#" PRIx64
"\n",
147 mem_start
, sym
->name
, mem_end
,
151 * Do not count this as a failure, because we
152 * could really find a case where it's not
153 * possible to get proper function end from
159 pair
= machine__find_kernel_symbol_by_name(&kallsyms
, type
, sym
->name
, NULL
, NULL
);
161 if (UM(pair
->start
) == mem_start
)
164 pr_debug("%#" PRIx64
": diff name v: %s k: %s\n",
165 mem_start
, sym
->name
, pair
->name
);
167 pr_debug("%#" PRIx64
": diff name v: %s k: %s\n",
168 mem_start
, sym
->name
, first_pair
->name
);
172 pr_debug("%#" PRIx64
": %s not on kallsyms\n",
173 mem_start
, sym
->name
);
181 pr_info("Maps only in vmlinux:\n");
183 for (map
= maps__first(maps
); map
; map
= map__next(map
)) {
186 * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
187 * the kernel will have the path for the vmlinux file being used,
188 * so use the short name, less descriptive but the same ("[kernel]" in
191 pair
= map_groups__find_by_name(&kallsyms
.kmaps
, type
,
193 map
->dso
->short_name
:
198 map__fprintf(map
, stderr
);
201 pr_info("Maps in vmlinux with a different name in kallsyms:\n");
203 for (map
= maps__first(maps
); map
; map
= map__next(map
)) {
206 mem_start
= vmlinux_map
->unmap_ip(vmlinux_map
, map
->start
);
207 mem_end
= vmlinux_map
->unmap_ip(vmlinux_map
, map
->end
);
209 pair
= map_groups__find(&kallsyms
.kmaps
, type
, mem_start
);
210 if (pair
== NULL
|| pair
->priv
)
213 if (pair
->start
== mem_start
) {
215 pr_info(" %" PRIx64
"-%" PRIx64
" %" PRIx64
" %s in kallsyms as",
216 map
->start
, map
->end
, map
->pgoff
, map
->dso
->name
);
217 if (mem_end
!= pair
->end
)
218 pr_info(":\n*%" PRIx64
"-%" PRIx64
" %" PRIx64
,
219 pair
->start
, pair
->end
, pair
->pgoff
);
220 pr_info(" %s\n", pair
->dso
->name
);
225 pr_info("Maps only in kallsyms:\n");
227 maps
= &kallsyms
.kmaps
.maps
[type
];
229 for (map
= maps__first(maps
); map
; map
= map__next(map
)) {
231 map__fprintf(map
, stderr
);
234 machine__exit(&kallsyms
);
235 machine__exit(&vmlinux
);