[RFC PATCH 11/22] perf bpf: collect symbol table in object files.

[Wang Nan]

This patch collects symbols section. This section is useful when
linking ELF maps.

Signed-off-by: Wang Nan <wangn...@huawei.com>
---
 tools/perf/util/bpf-loader.c | 11 +++++++++++
 tools/perf/util/bpf-loader.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index b913d6f..b9c701a 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -50,6 +50,9 @@ static void bpf_obj_clear_elf(struct bpf_obj *obj)
                elf_end(obj->elf.elf);
                obj->elf.elf = NULL;
        }
+       
+       obj->elf.symbols = NULL;
+
        if (obj->elf.fd >= 0) {
                close(obj->elf.fd);
                obj->elf.fd = -1;
@@ -312,6 +315,14 @@ static int bpf_obj_elf_collect(struct bpf_obj *obj)
                else if (strcmp(name, "config") == 0)
                        err = bpf_obj_config_init(obj, data->d_buf,
                                                  data->d_size);
+               else if (sh.sh_type == SHT_SYMTAB) {
+                       if (obj->elf.symbols) {
+                               pr_err("bpf: multiple SYMTAB in %s\n",
+                                       obj->path);
+                               err = -EEXIST;
+                       } else
+                               obj->elf.symbols = data;
+               }
                if (err)
                        goto out;
        }
diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h
index 086f28d..f0b573c 100644
--- a/tools/perf/util/bpf-loader.h
+++ b/tools/perf/util/bpf-loader.h
@@ -38,6 +38,7 @@ struct bpf_obj {
                int fd;
                Elf *elf;
                GElf_Ehdr ehdr;
+               Elf_Data *symbols;
        } elf;
 };
 #define obj_elf_valid(o)       ((o)->elf.fd >= 0)
-- 
1.8.3.4

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