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@@ -0,0 +1,230 @@
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+#include <linux/compiler.h>
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+#include <linux/rbtree.h>
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+#include <string.h>
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+#include "map.h"
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+#include "symbol.h"
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+#include "util.h"
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+#include "tests.h"
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+#include "debug.h"
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+#include "machine.h"
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+
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+static int vmlinux_matches_kallsyms_filter(struct map *map __maybe_unused,
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+ struct symbol *sym)
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+{
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+ bool *visited = symbol__priv(sym);
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+ *visited = true;
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+ return 0;
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+}
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+
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+int test__vmlinux_matches_kallsyms(void)
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+{
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+ int err = -1;
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+ struct rb_node *nd;
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+ struct symbol *sym;
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+ struct map *kallsyms_map, *vmlinux_map;
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+ struct machine kallsyms, vmlinux;
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+ enum map_type type = MAP__FUNCTION;
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+ struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
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+
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+ /*
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+ * Step 1:
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+ *
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+ * Init the machines that will hold kernel, modules obtained from
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+ * both vmlinux + .ko files and from /proc/kallsyms split by modules.
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+ */
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+ machine__init(&kallsyms, "", HOST_KERNEL_ID);
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+ machine__init(&vmlinux, "", HOST_KERNEL_ID);
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+
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+ /*
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+ * Step 2:
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+ *
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+ * Create the kernel maps for kallsyms and the DSO where we will then
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+ * load /proc/kallsyms. Also create the modules maps from /proc/modules
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+ * and find the .ko files that match them in /lib/modules/`uname -r`/.
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+ */
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+ if (machine__create_kernel_maps(&kallsyms) < 0) {
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+ pr_debug("machine__create_kernel_maps ");
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+ return -1;
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+ }
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+
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+ /*
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+ * Step 3:
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+ *
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+ * Load and split /proc/kallsyms into multiple maps, one per module.
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+ */
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+ if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
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+ pr_debug("dso__load_kallsyms ");
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+ goto out;
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+ }
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+
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+ /*
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+ * Step 4:
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+ *
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+ * kallsyms will be internally on demand sorted by name so that we can
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+ * find the reference relocation * symbol, i.e. the symbol we will use
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+ * to see if the running kernel was relocated by checking if it has the
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+ * same value in the vmlinux file we load.
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+ */
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+ kallsyms_map = machine__kernel_map(&kallsyms, type);
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+
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+ sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
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+ if (sym == NULL) {
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+ pr_debug("dso__find_symbol_by_name ");
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+ goto out;
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+ }
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+
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+ ref_reloc_sym.addr = sym->start;
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+
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+ /*
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+ * Step 5:
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+ *
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+ * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
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+ */
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+ if (machine__create_kernel_maps(&vmlinux) < 0) {
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+ pr_debug("machine__create_kernel_maps ");
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+ goto out;
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+ }
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+
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+ vmlinux_map = machine__kernel_map(&vmlinux, type);
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+ map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;
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+
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+ /*
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+ * Step 6:
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+ *
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+ * Locate a vmlinux file in the vmlinux path that has a buildid that
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+ * matches the one of the running kernel.
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+ *
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+ * While doing that look if we find the ref reloc symbol, if we find it
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+ * we'll have its ref_reloc_symbol.unrelocated_addr and then
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+ * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
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+ * to fixup the symbols.
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+ */
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+ if (machine__load_vmlinux_path(&vmlinux, type,
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+ vmlinux_matches_kallsyms_filter) <= 0) {
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+ pr_debug("machine__load_vmlinux_path ");
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+ goto out;
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+ }
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+
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+ err = 0;
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+ /*
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+ * Step 7:
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+ *
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+ * Now look at the symbols in the vmlinux DSO and check if we find all of them
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+ * in the kallsyms dso. For the ones that are in both, check its names and
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+ * end addresses too.
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+ */
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+ for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
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+ struct symbol *pair, *first_pair;
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+ bool backwards = true;
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+
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+ sym = rb_entry(nd, struct symbol, rb_node);
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+
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+ if (sym->start == sym->end)
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+ continue;
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+
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+ first_pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
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+ pair = first_pair;
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+
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+ if (pair && pair->start == sym->start) {
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+next_pair:
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+ if (strcmp(sym->name, pair->name) == 0) {
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+ /*
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+ * kallsyms don't have the symbol end, so we
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+ * set that by using the next symbol start - 1,
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+ * in some cases we get this up to a page
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+ * wrong, trace_kmalloc when I was developing
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+ * this code was one such example, 2106 bytes
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+ * off the real size. More than that and we
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+ * _really_ have a problem.
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+ */
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+ s64 skew = sym->end - pair->end;
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+ if (llabs(skew) < page_size)
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+ continue;
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+
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+ pr_debug("%#" PRIx64 ": diff end addr for %s v: %#" PRIx64 " k: %#" PRIx64 "\n",
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+ sym->start, sym->name, sym->end, pair->end);
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+ } else {
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+ struct rb_node *nnd;
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+detour:
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+ nnd = backwards ? rb_prev(&pair->rb_node) :
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+ rb_next(&pair->rb_node);
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+ if (nnd) {
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+ struct symbol *next = rb_entry(nnd, struct symbol, rb_node);
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+
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+ if (next->start == sym->start) {
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+ pair = next;
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+ goto next_pair;
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+ }
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+ }
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+
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+ if (backwards) {
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+ backwards = false;
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+ pair = first_pair;
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+ goto detour;
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+ }
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+
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+ pr_debug("%#" PRIx64 ": diff name v: %s k: %s\n",
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+ sym->start, sym->name, pair->name);
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+ }
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+ } else
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+ pr_debug("%#" PRIx64 ": %s not on kallsyms\n", sym->start, sym->name);
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+
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+ err = -1;
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+ }
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+
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+ if (!verbose)
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+ goto out;
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+
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+ pr_info("Maps only in vmlinux:\n");
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+
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+ for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
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+ struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
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+ /*
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+ * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
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+ * the kernel will have the path for the vmlinux file being used,
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+ * so use the short name, less descriptive but the same ("[kernel]" in
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+ * both cases.
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+ */
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+ pair = map_groups__find_by_name(&kallsyms.kmaps, type,
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+ (pos->dso->kernel ?
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+ pos->dso->short_name :
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+ pos->dso->name));
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+ if (pair)
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+ pair->priv = 1;
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+ else
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+ map__fprintf(pos, stderr);
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+ }
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+
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+ pr_info("Maps in vmlinux with a different name in kallsyms:\n");
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+
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+ for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
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+ struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
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+
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+ pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
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+ if (pair == NULL || pair->priv)
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+ continue;
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+
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+ if (pair->start == pos->start) {
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+ pair->priv = 1;
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+ pr_info(" %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s in kallsyms as",
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+ pos->start, pos->end, pos->pgoff, pos->dso->name);
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+ if (pos->pgoff != pair->pgoff || pos->end != pair->end)
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+ pr_info(": \n*%" PRIx64 "-%" PRIx64 " %" PRIx64 "",
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+ pair->start, pair->end, pair->pgoff);
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+ pr_info(" %s\n", pair->dso->name);
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+ pair->priv = 1;
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+ }
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+ }
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+
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+ pr_info("Maps only in kallsyms:\n");
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+
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+ for (nd = rb_first(&kallsyms.kmaps.maps[type]);
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+ nd; nd = rb_next(nd)) {
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+ struct map *pos = rb_entry(nd, struct map, rb_node);
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+
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+ if (!pos->priv)
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+ map__fprintf(pos, stderr);
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+ }
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+out:
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+ return err;
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+}
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Jiri Olsa