546 lines
9.7 KiB
C
546 lines
9.7 KiB
C
#include "util.h"
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#include "../perf.h"
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#include "string.h"
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#include "module.h"
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#include <libelf.h>
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#include <libgen.h>
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#include <gelf.h>
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#include <elf.h>
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#include <dirent.h>
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#include <sys/utsname.h>
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static unsigned int crc32(const char *p, unsigned int len)
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{
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int i;
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unsigned int crc = 0;
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while (len--) {
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crc ^= *p++;
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for (i = 0; i < 8; i++)
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crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
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}
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return crc;
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}
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/* module section methods */
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struct sec_dso *sec_dso__new_dso(const char *name)
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{
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struct sec_dso *self = malloc(sizeof(*self) + strlen(name) + 1);
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if (self != NULL) {
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strcpy(self->name, name);
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self->secs = RB_ROOT;
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self->find_section = sec_dso__find_section;
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}
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return self;
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}
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static void sec_dso__delete_section(struct section *self)
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{
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free(((void *)self));
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}
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void sec_dso__delete_sections(struct sec_dso *self)
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{
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struct section *pos;
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struct rb_node *next = rb_first(&self->secs);
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while (next) {
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pos = rb_entry(next, struct section, rb_node);
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next = rb_next(&pos->rb_node);
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rb_erase(&pos->rb_node, &self->secs);
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sec_dso__delete_section(pos);
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}
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}
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void sec_dso__delete_self(struct sec_dso *self)
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{
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sec_dso__delete_sections(self);
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free(self);
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}
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static void sec_dso__insert_section(struct sec_dso *self, struct section *sec)
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{
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struct rb_node **p = &self->secs.rb_node;
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struct rb_node *parent = NULL;
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const u64 hash = sec->hash;
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struct section *s;
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while (*p != NULL) {
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parent = *p;
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s = rb_entry(parent, struct section, rb_node);
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if (hash < s->hash)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&sec->rb_node, parent, p);
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rb_insert_color(&sec->rb_node, &self->secs);
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}
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struct section *sec_dso__find_section(struct sec_dso *self, const char *name)
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{
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struct rb_node *n;
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u64 hash;
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int len;
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if (self == NULL)
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return NULL;
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len = strlen(name);
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hash = crc32(name, len);
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n = self->secs.rb_node;
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while (n) {
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struct section *s = rb_entry(n, struct section, rb_node);
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if (hash < s->hash)
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n = n->rb_left;
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else if (hash > s->hash)
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n = n->rb_right;
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else {
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if (!strcmp(name, s->name))
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return s;
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else
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n = rb_next(&s->rb_node);
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}
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}
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return NULL;
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}
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static size_t sec_dso__fprintf_section(struct section *self, FILE *fp)
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{
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return fprintf(fp, "name:%s vma:%llx path:%s\n",
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self->name, self->vma, self->path);
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}
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size_t sec_dso__fprintf(struct sec_dso *self, FILE *fp)
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{
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size_t ret = fprintf(fp, "dso: %s\n", self->name);
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struct rb_node *nd;
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for (nd = rb_first(&self->secs); nd; nd = rb_next(nd)) {
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struct section *pos = rb_entry(nd, struct section, rb_node);
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ret += sec_dso__fprintf_section(pos, fp);
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}
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return ret;
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}
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static struct section *section__new(const char *name, const char *path)
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{
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struct section *self = calloc(1, sizeof(*self));
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if (!self)
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goto out_failure;
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self->name = calloc(1, strlen(name) + 1);
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if (!self->name)
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goto out_failure;
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self->path = calloc(1, strlen(path) + 1);
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if (!self->path)
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goto out_failure;
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strcpy(self->name, name);
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strcpy(self->path, path);
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self->hash = crc32(self->name, strlen(name));
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return self;
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out_failure:
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if (self) {
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if (self->name)
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free(self->name);
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if (self->path)
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free(self->path);
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free(self);
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}
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return NULL;
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}
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/* module methods */
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struct mod_dso *mod_dso__new_dso(const char *name)
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{
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struct mod_dso *self = malloc(sizeof(*self) + strlen(name) + 1);
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if (self != NULL) {
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strcpy(self->name, name);
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self->mods = RB_ROOT;
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self->find_module = mod_dso__find_module;
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}
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return self;
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}
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static void mod_dso__delete_module(struct module *self)
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{
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free(((void *)self));
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}
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void mod_dso__delete_modules(struct mod_dso *self)
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{
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struct module *pos;
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struct rb_node *next = rb_first(&self->mods);
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while (next) {
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pos = rb_entry(next, struct module, rb_node);
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next = rb_next(&pos->rb_node);
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rb_erase(&pos->rb_node, &self->mods);
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mod_dso__delete_module(pos);
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}
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}
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void mod_dso__delete_self(struct mod_dso *self)
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{
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mod_dso__delete_modules(self);
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free(self);
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}
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static void mod_dso__insert_module(struct mod_dso *self, struct module *mod)
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{
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struct rb_node **p = &self->mods.rb_node;
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struct rb_node *parent = NULL;
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const u64 hash = mod->hash;
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struct module *m;
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while (*p != NULL) {
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parent = *p;
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m = rb_entry(parent, struct module, rb_node);
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if (hash < m->hash)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&mod->rb_node, parent, p);
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rb_insert_color(&mod->rb_node, &self->mods);
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}
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struct module *mod_dso__find_module(struct mod_dso *self, const char *name)
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{
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struct rb_node *n;
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u64 hash;
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int len;
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if (self == NULL)
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return NULL;
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len = strlen(name);
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hash = crc32(name, len);
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n = self->mods.rb_node;
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while (n) {
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struct module *m = rb_entry(n, struct module, rb_node);
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if (hash < m->hash)
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n = n->rb_left;
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else if (hash > m->hash)
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n = n->rb_right;
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else {
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if (!strcmp(name, m->name))
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return m;
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else
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n = rb_next(&m->rb_node);
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}
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}
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return NULL;
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}
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static size_t mod_dso__fprintf_module(struct module *self, FILE *fp)
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{
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return fprintf(fp, "name:%s path:%s\n", self->name, self->path);
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}
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size_t mod_dso__fprintf(struct mod_dso *self, FILE *fp)
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{
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struct rb_node *nd;
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size_t ret;
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ret = fprintf(fp, "dso: %s\n", self->name);
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for (nd = rb_first(&self->mods); nd; nd = rb_next(nd)) {
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struct module *pos = rb_entry(nd, struct module, rb_node);
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ret += mod_dso__fprintf_module(pos, fp);
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}
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return ret;
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}
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static struct module *module__new(const char *name, const char *path)
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{
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struct module *self = calloc(1, sizeof(*self));
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if (!self)
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goto out_failure;
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self->name = calloc(1, strlen(name) + 1);
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if (!self->name)
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goto out_failure;
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self->path = calloc(1, strlen(path) + 1);
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if (!self->path)
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goto out_failure;
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strcpy(self->name, name);
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strcpy(self->path, path);
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self->hash = crc32(self->name, strlen(name));
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return self;
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out_failure:
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if (self) {
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if (self->name)
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free(self->name);
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if (self->path)
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free(self->path);
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free(self);
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}
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return NULL;
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}
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static int mod_dso__load_sections(struct module *mod)
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{
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int count = 0, path_len;
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struct dirent *entry;
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char *line = NULL;
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char *dir_path;
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DIR *dir;
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size_t n;
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path_len = strlen("/sys/module/");
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path_len += strlen(mod->name);
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path_len += strlen("/sections/");
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dir_path = calloc(1, path_len + 1);
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if (dir_path == NULL)
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goto out_failure;
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strcat(dir_path, "/sys/module/");
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strcat(dir_path, mod->name);
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strcat(dir_path, "/sections/");
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dir = opendir(dir_path);
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if (dir == NULL)
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goto out_free;
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while ((entry = readdir(dir))) {
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struct section *section;
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char *path, *vma;
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int line_len;
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FILE *file;
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if (!strcmp(".", entry->d_name) || !strcmp("..", entry->d_name))
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continue;
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path = calloc(1, path_len + strlen(entry->d_name) + 1);
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if (path == NULL)
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break;
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strcat(path, dir_path);
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strcat(path, entry->d_name);
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file = fopen(path, "r");
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if (file == NULL) {
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free(path);
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break;
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}
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line_len = getline(&line, &n, file);
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if (line_len < 0) {
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free(path);
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fclose(file);
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break;
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}
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if (!line) {
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free(path);
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fclose(file);
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break;
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}
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line[--line_len] = '\0'; /* \n */
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vma = strstr(line, "0x");
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if (!vma) {
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free(path);
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fclose(file);
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break;
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}
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vma += 2;
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section = section__new(entry->d_name, path);
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if (!section) {
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fprintf(stderr, "load_sections: allocation error\n");
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free(path);
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fclose(file);
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break;
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}
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hex2u64(vma, §ion->vma);
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sec_dso__insert_section(mod->sections, section);
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free(path);
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fclose(file);
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count++;
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}
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closedir(dir);
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free(line);
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free(dir_path);
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return count;
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out_free:
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free(dir_path);
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out_failure:
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return count;
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}
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static int mod_dso__load_module_paths(struct mod_dso *self)
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{
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struct utsname uts;
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int count = 0, len, err = -1;
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char *line = NULL;
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FILE *file;
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char *dpath, *dir;
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size_t n;
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if (uname(&uts) < 0)
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return err;
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len = strlen("/lib/modules/");
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len += strlen(uts.release);
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len += strlen("/modules.dep");
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dpath = calloc(1, len + 1);
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if (dpath == NULL)
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return err;
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strcat(dpath, "/lib/modules/");
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strcat(dpath, uts.release);
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strcat(dpath, "/modules.dep");
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file = fopen(dpath, "r");
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if (file == NULL)
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goto out_failure;
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dir = dirname(dpath);
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if (!dir)
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goto out_failure;
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strcat(dir, "/");
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while (!feof(file)) {
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struct module *module;
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char *name, *path, *tmp;
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FILE *modfile;
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int line_len;
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line_len = getline(&line, &n, file);
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if (line_len < 0)
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break;
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if (!line)
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break;
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line[--line_len] = '\0'; /* \n */
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path = strchr(line, ':');
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if (!path)
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break;
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*path = '\0';
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path = strdup(line);
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if (!path)
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break;
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if (!strstr(path, dir)) {
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if (strncmp(path, "kernel/", 7))
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break;
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free(path);
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path = calloc(1, strlen(dir) + strlen(line) + 1);
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if (!path)
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break;
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strcat(path, dir);
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strcat(path, line);
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}
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modfile = fopen(path, "r");
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if (modfile == NULL)
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break;
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fclose(modfile);
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name = strdup(path);
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if (!name)
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break;
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name = strtok(name, "/");
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tmp = name;
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while (tmp) {
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tmp = strtok(NULL, "/");
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if (tmp)
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name = tmp;
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}
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name = strsep(&name, ".");
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if (!name)
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break;
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/* Quirk: replace '-' with '_' in all modules */
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for (len = strlen(name); len; len--) {
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if (*(name+len) == '-')
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*(name+len) = '_';
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}
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module = module__new(name, path);
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if (!module)
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break;
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mod_dso__insert_module(self, module);
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module->sections = sec_dso__new_dso("sections");
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if (!module->sections)
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break;
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module->active = mod_dso__load_sections(module);
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if (module->active > 0)
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count++;
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}
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if (feof(file))
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err = count;
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else
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fprintf(stderr, "load_module_paths: modules.dep parsing failure!\n");
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out_failure:
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if (dpath)
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free(dpath);
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if (file)
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fclose(file);
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if (line)
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free(line);
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return err;
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}
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int mod_dso__load_modules(struct mod_dso *dso)
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{
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int err;
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err = mod_dso__load_module_paths(dso);
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return err;
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}
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