384 lines
9.1 KiB
C
384 lines
9.1 KiB
C
/*
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* builtin-test.c
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*
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* Builtin regression testing command: ever growing number of sanity tests
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*/
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#include "builtin.h"
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#include "util/cache.h"
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#include "util/debug.h"
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#include "util/parse-options.h"
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#include "util/session.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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static long page_size;
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static int vmlinux_matches_kallsyms_filter(struct map *map __used, 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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static 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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* 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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* 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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* 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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* 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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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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ref_reloc_sym.addr = sym->start;
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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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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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* 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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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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sym = rb_entry(nd, struct symbol, rb_node);
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if (sym->start == sym->end)
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continue;
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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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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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pr_debug("%#Lx: diff end addr for %s v: %#Lx k: %#Lx\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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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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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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pr_debug("%#Lx: 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("%#Lx: %s not on kallsyms\n", sym->start, sym->name);
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err = -1;
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}
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if (!verbose)
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goto out;
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pr_info("Maps only in vmlinux:\n");
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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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pr_info("Maps in vmlinux with a different name in kallsyms:\n");
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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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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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if (pair->start == pos->start) {
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pair->priv = 1;
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pr_info(" %Lx-%Lx %Lx %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*%Lx-%Lx %Lx",
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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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pr_info("Maps only in kallsyms:\n");
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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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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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#include "util/evsel.h"
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#include <sys/types.h>
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static int trace_event__id(const char *event_name)
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{
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char *filename;
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int err = -1, fd;
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if (asprintf(&filename,
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"/sys/kernel/debug/tracing/events/syscalls/%s/id",
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event_name) < 0)
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return -1;
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fd = open(filename, O_RDONLY);
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if (fd >= 0) {
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char id[16];
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if (read(fd, id, sizeof(id)) > 0)
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err = atoi(id);
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close(fd);
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}
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free(filename);
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return err;
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}
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static int test__open_syscall_event(void)
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{
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int err = -1, fd;
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struct thread_map *threads;
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struct perf_evsel *evsel;
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unsigned int nr_open_calls = 111, i;
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int id = trace_event__id("sys_enter_open");
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if (id < 0) {
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pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
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return -1;
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}
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threads = thread_map__new(-1, getpid());
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if (threads == NULL) {
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pr_debug("thread_map__new\n");
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return -1;
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}
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evsel = perf_evsel__new(PERF_TYPE_TRACEPOINT, id, 0);
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if (evsel == NULL) {
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pr_debug("perf_evsel__new\n");
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goto out_thread_map_delete;
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}
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if (perf_evsel__open_per_thread(evsel, threads) < 0) {
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pr_debug("failed to open counter: %s, "
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"tweak /proc/sys/kernel/perf_event_paranoid?\n",
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strerror(errno));
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goto out_evsel_delete;
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}
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for (i = 0; i < nr_open_calls; ++i) {
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fd = open("/etc/passwd", O_RDONLY);
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close(fd);
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}
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if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
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pr_debug("perf_evsel__open_read_on_cpu\n");
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goto out_close_fd;
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}
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if (evsel->counts->cpu[0].val != nr_open_calls) {
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pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %Ld\n",
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nr_open_calls, evsel->counts->cpu[0].val);
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goto out_close_fd;
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}
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err = 0;
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out_close_fd:
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perf_evsel__close_fd(evsel, 1, threads->nr);
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out_evsel_delete:
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perf_evsel__delete(evsel);
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out_thread_map_delete:
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thread_map__delete(threads);
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return err;
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}
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static struct test {
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const char *desc;
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int (*func)(void);
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} tests[] = {
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{
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.desc = "vmlinux symtab matches kallsyms",
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.func = test__vmlinux_matches_kallsyms,
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},
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{
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.desc = "detect open syscall event",
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.func = test__open_syscall_event,
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},
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{
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.func = NULL,
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},
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};
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static int __cmd_test(void)
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{
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int i = 0;
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page_size = sysconf(_SC_PAGE_SIZE);
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while (tests[i].func) {
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int err;
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pr_info("%2d: %s:", i + 1, tests[i].desc);
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pr_debug("\n--- start ---\n");
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err = tests[i].func();
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pr_debug("---- end ----\n%s:", tests[i].desc);
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pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
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++i;
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}
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return 0;
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}
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static const char * const test_usage[] = {
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"perf test [<options>]",
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NULL,
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};
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static const struct option test_options[] = {
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OPT_INTEGER('v', "verbose", &verbose,
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"be more verbose (show symbol address, etc)"),
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OPT_END()
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};
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int cmd_test(int argc, const char **argv, const char *prefix __used)
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{
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argc = parse_options(argc, argv, test_options, test_usage, 0);
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if (argc)
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usage_with_options(test_usage, test_options);
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symbol_conf.priv_size = sizeof(int);
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symbol_conf.sort_by_name = true;
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symbol_conf.try_vmlinux_path = true;
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if (symbol__init() < 0)
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return -1;
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setup_pager();
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return __cmd_test();
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}
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