perf_counter tools: Connect module support infrastructure to symbol loading infrastructure

Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1246514916.13293.46.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 149 insertions, 10 deletions

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index c077b6a14690..98a13114de70 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -35,7 +35,7 @@ static struct symbol *symbol__new(u64 start, u64 len,
                 self = ((void *)self) + priv_size;
         }
         self->start = start;
-        self->end   = start + len - 1;
+        self->end   = len ? start + len - 1 : start;
         memcpy(self->name, name, namelen);
 
         return self;
@@ -48,8 +48,12 @@ static void symbol__delete(struct symbol *self, unsigned int priv_size)
 
 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
 {
-        return fprintf(fp, " %llx-%llx %s\n",
+        if (!self->module)
+                return fprintf(fp, " %llx-%llx %s\n",
                        self->start, self->end, self->name);
+        else
+                return fprintf(fp, " %llx-%llx %s \t[%s]\n",
+                       self->start, self->end, self->name, self->module->name);
 }
 
 struct dso *dso__new(const char *name, unsigned int sym_priv_size)
@@ -310,6 +314,26 @@ static inline int elf_sym__is_function(const GElf_Sym *sym)
                sym->st_size != 0;
 }
 
+static inline int elf_sym__is_label(const GElf_Sym *sym)
+{
+        return elf_sym__type(sym) == STT_NOTYPE &&
+                sym->st_name != 0 &&
+                sym->st_shndx != SHN_UNDEF &&
+                sym->st_shndx != SHN_ABS;
+}
+
+static inline const char *elf_sec__name(const GElf_Shdr *shdr,
+                                        const Elf_Data *secstrs)
+{
+        return secstrs->d_buf + shdr->sh_name;
+}
+
+static inline int elf_sec__is_text(const GElf_Shdr *shdr,
+                                        const Elf_Data *secstrs)
+{
+        return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
+}
+
 static inline const char *elf_sym__name(const GElf_Sym *sym,
                                         const Elf_Data *symstrs)
 {
@@ -451,9 +475,9 @@ static int dso__synthesize_plt_symbols(struct  dso *self, Elf *elf,
 }
 
 static int dso__load_sym(struct dso *self, int fd, const char *name,
-                         symbol_filter_t filter, int verbose)
+                         symbol_filter_t filter, int verbose, struct module *mod)
 {
-        Elf_Data *symstrs;
+        Elf_Data *symstrs, *secstrs;
         uint32_t nr_syms;
         int err = -1;
         uint32_t index;
@@ -461,7 +485,7 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
         GElf_Shdr shdr;
         Elf_Data *syms;
         GElf_Sym sym;
-        Elf_Scn *sec, *sec_dynsym;
+        Elf_Scn *sec, *sec_dynsym, *sec_strndx;
         Elf *elf;
         size_t dynsym_idx;
         int nr = 0;
@@ -520,6 +544,14 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
         if (symstrs == NULL)
                 goto out_elf_end;
 
+        sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
+        if (sec_strndx == NULL)
+                goto out_elf_end;
+
+        secstrs = elf_getdata(sec_strndx, NULL);
+        if (symstrs == NULL)
+                goto out_elf_end;
+
         nr_syms = shdr.sh_size / shdr.sh_entsize;
 
         memset(&sym, 0, sizeof(sym));
@@ -529,8 +561,11 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
         elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
                 struct symbol *f;
                 u64 obj_start;
+                struct section *section = NULL;
+                int is_label = elf_sym__is_label(&sym);
+                const char *section_name;
 
-                if (!elf_sym__is_function(&sym))
+                if (!is_label && !elf_sym__is_function(&sym))
                         continue;
 
                 sec = elf_getscn(elf, sym.st_shndx);
@@ -538,6 +573,11 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
                         goto out_elf_end;
 
                 gelf_getshdr(sec, &shdr);
+
+                if (is_label && !elf_sec__is_text(&shdr, secstrs))
+                        continue;
+
+                section_name = elf_sec__name(&shdr, secstrs);
                 obj_start = sym.st_value;
 
                 if (self->prelinked) {
@@ -548,6 +588,17 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
                 }
 
+                if (mod) {
+                        section = mod->sections->find_section(mod->sections, section_name);
+                        if (section)
+                                sym.st_value += section->vma;
+                        else {
+                                fprintf(stderr, "dso__load_sym() module %s lookup of %s failed\n",
+                                        mod->name, section_name);
+                                goto out_elf_end;
+                        }
+                }
+
                 f = symbol__new(sym.st_value, sym.st_size,
                                 elf_sym__name(&sym, symstrs),
                                 self->sym_priv_size, obj_start, verbose);
@@ -557,6 +608,7 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
                 if (filter && filter(self, f))
                         symbol__delete(f, self->sym_priv_size);
                 else {
+                        f->module = mod;
                         dso__insert_symbol(self, f);
                         nr++;
                 }
@@ -606,7 +658,7 @@ more:
                 fd = open(name, O_RDONLY);
         } while (fd < 0);
 
-        ret = dso__load_sym(self, fd, name, filter, verbose);
+        ret = dso__load_sym(self, fd, name, filter, verbose, NULL);
         close(fd);
 
         /*
@@ -620,6 +672,86 @@ out:
         return ret;
 }
 
+static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name,
+                             symbol_filter_t filter, int verbose)
+{
+        struct module *mod = mod_dso__find_module(mods, name);
+        int err = 0, fd;
+
+        if (mod == NULL || !mod->active)
+                return err;
+
+        fd = open(mod->path, O_RDONLY);
+
+        if (fd < 0)
+                return err;
+
+        err = dso__load_sym(self, fd, name, filter, verbose, mod);
+        close(fd);
+
+        return err;
+}
+
+int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose)
+{
+        struct mod_dso *mods = mod_dso__new_dso("modules");
+        struct module *pos;
+        struct rb_node *next;
+        int err;
+
+        err = mod_dso__load_modules(mods);
+
+        if (err <= 0)
+                return err;
+
+        /*
+         * Iterate over modules, and load active symbols.
+         */
+        next = rb_first(&mods->mods);
+        while (next) {
+                pos = rb_entry(next, struct module, rb_node);
+                err = dso__load_module(self, mods, pos->name, filter, verbose);
+
+                if (err < 0)
+                        break;
+
+                next = rb_next(&pos->rb_node);
+        }
+
+        if (err < 0) {
+                mod_dso__delete_modules(mods);
+                mod_dso__delete_self(mods);
+        }
+
+        return err;
+}
+
+static inline void dso__fill_symbol_holes(struct dso *self)
+{
+        struct symbol *prev = NULL;
+        struct rb_node *nd;
+
+        for (nd = rb_last(&self->syms); nd; nd = rb_prev(nd)) {
+                struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
+
+                if (prev) {
+                        u64 hole = 0;
+                        int alias = pos->start == prev->start;
+
+                        if (!alias)
+                                hole = prev->start - pos->end - 1;
+
+                        if (hole || alias) {
+                                if (alias)
+                                        pos->end = prev->end;
+                                else if (hole)
+                                        pos->end = prev->start - 1;
+                        }
+                }
+                prev = pos;
+        }
+}
+
 static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
                              symbol_filter_t filter, int verbose)
 {
@@ -628,19 +760,26 @@ static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
         if (fd < 0)
                 return -1;
 
-        err = dso__load_sym(self, fd, vmlinux, filter, verbose);
+        err = dso__load_sym(self, fd, vmlinux, filter, verbose, NULL);
+
+        if (err > 0)
+                dso__fill_symbol_holes(self);
+
         close(fd);
 
         return err;
 }
 
 int dso__load_kernel(struct dso *self, const char *vmlinux,
-                     symbol_filter_t filter, int verbose)
+                     symbol_filter_t filter, int verbose, int modules)
 {
         int err = -1;
 
-        if (vmlinux)
+        if (vmlinux) {
                 err = dso__load_vmlinux(self, vmlinux, filter, verbose);
+                if (err > 0 && modules)
+                        err = dso__load_modules(self, filter, verbose);
+        }
 
         if (err <= 0)
                 err = dso__load_kallsyms(self, filter, verbose);