perf tools: Make it possible to read object code from kernel modules

The new "object code reading" test shows that it is not possible to read
object code from kernel modules.  That is because the mappings do not
map to the dsos.  This patch fixes that.

This involves identifying and flagging relocatable (ELF type ET_REL)
files (e.g. kernel modules) for symbol adjustment and updating
map__rip_2objdump() accordingly.  The kmodule parameter of
dso__load_sym() is taken into use and the module map altered to map to
the dso.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1375875537-4509-7-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

5 files changed, 43 insertions, 9 deletions

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 121583dbf34b..1955804e82ff 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -419,6 +419,7 @@ struct dso *dso__new(const char *name)
                 dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND;
                 dso->data_type   = DSO_BINARY_TYPE__NOT_FOUND;
                 dso->loaded = 0;
+                dso->rel = 0;
                 dso->sorted_by_name = 0;
                 dso->has_build_id = 0;
                 dso->kernel = DSO_TYPE_USER;
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index 02aadaf45c63..735a83751b19 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -85,6 +85,7 @@ struct dso {
         u8               lname_alloc:1;
         u8               sorted_by_name;
         u8               loaded;
+        u8               rel;
         u8               build_id[BUILD_ID_SIZE];
         const char       *short_name;
         char             *long_name;
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 5f662a3a0163..4d599febfb0b 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -248,14 +248,18 @@ size_t map__fprintf_dsoname(struct map *map, FILE *fp)
 
 /*
  * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
- * map->dso->adjust_symbols==1 for ET_EXEC-like cases.
+ * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
+ * relative to section start.
  */
 u64 map__rip_2objdump(struct map *map, u64 rip)
 {
-        u64 addr = map->dso->adjust_symbols ?
-                        map->unmap_ip(map, rip) :       /* RIP -> IP */
-                        rip;
-        return addr;
+        if (!map->dso->adjust_symbols)
+                return rip;
+
+        if (map->dso->rel)
+                return rip - map->pgoff;
+
+        return map->unmap_ip(map, rip);
 }
 
 void map_groups__init(struct map_groups *mg)
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index ed6f443a3e10..3eaa7b486e2e 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -599,11 +599,13 @@ int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
         if (dso->kernel == DSO_TYPE_USER) {
                 GElf_Shdr shdr;
                 ss->adjust_symbols = (ehdr.e_type == ET_EXEC ||
+                                ehdr.e_type == ET_REL ||
                                 elf_section_by_name(elf, &ehdr, &shdr,
                                                      ".gnu.prelink_undo",
                                                      NULL) != NULL);
         } else {
-                ss->adjust_symbols = ehdr.e_type == ET_EXEC;
+                ss->adjust_symbols = ehdr.e_type == ET_EXEC ||
+                                     ehdr.e_type == ET_REL;
         }
 
         ss->name   = strdup(name);
@@ -676,6 +678,14 @@ int dso__load_sym(struct dso *dso, struct map *map,
         bool remap_kernel = false, adjust_kernel_syms = false;
 
         dso->symtab_type = syms_ss->type;
+        dso->rel = syms_ss->ehdr.e_type == ET_REL;
+
+        /*
+         * Modules may already have symbols from kallsyms, but those symbols
+         * have the wrong values for the dso maps, so remove them.
+         */
+        if (kmodule && syms_ss->symtab)
+                symbols__delete(&dso->symbols[map->type]);
 
         if (!syms_ss->symtab) {
                 syms_ss->symtab  = syms_ss->dynsym;
@@ -828,11 +838,24 @@ int dso__load_sym(struct dso *dso, struct map *map,
                                         map_groups__insert(kmap->kmaps, map);
                                 }
 
+                                /*
+                                 * The initial module mapping is based on
+                                 * /proc/modules mapped to offset zero.
+                                 * Overwrite it to map to the module dso.
+                                 */
+                                if (remap_kernel && kmodule) {
+                                        remap_kernel = false;
+                                        map->pgoff = shdr.sh_offset;
+                                }
+
                                 curr_map = map;
                                 curr_dso = dso;
                                 goto new_symbol;
                         }
 
+                        if (!kmap)
+                                goto new_symbol;
+
                         snprintf(dso_name, sizeof(dso_name),
                                  "%s%s", dso->short_name, section_name);
 
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 04300dd5221f..b9056a8c1620 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -854,10 +854,15 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
         if (!runtime_ss && syms_ss)
                 runtime_ss = syms_ss;
 
-        if (syms_ss)
-                ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, 0);
-        else
+        if (syms_ss) {
+                int km;
+
+                km = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
+                     dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
+                ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, km);
+        } else {
                 ret = -1;
+        }
 
         if (ret > 0) {
                 int nr_plt;