[RFC PATCH v4 11/29] bpf tools: Collect symbol table from SHT_SYMTAB section

[Wang Nan]

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

Signed-off-by: Wang Nan <wangn...@huawei.com>
---
 tools/lib/bpf/libbpf.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index da83766..d89fd42 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -95,6 +95,7 @@ struct bpf_object {
                int fd;
                Elf *elf;
                GElf_Ehdr ehdr;
+               Elf_Data *symbols;
        } efile;
        char path[];
 };
@@ -124,6 +125,7 @@ static void bpf_object__elf_finish(struct bpf_object *obj)
                elf_end(obj->efile.elf);
                obj->efile.elf = NULL;
        }
+       obj->efile.symbols = NULL;
        zclose(obj->efile.fd);
 }
 
@@ -309,6 +311,14 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
                else if (strcmp(name, "maps") == 0)
                        err = bpf_object__init_maps(obj, data->d_buf,
                                                    data->d_size);
+               else if (sh.sh_type == SHT_SYMTAB) {
+                       if (obj->efile.symbols) {
+                               pr_warning("bpf: multiple SYMTAB in %s\n",
+                                          obj->path);
+                               err = -EEXIST;
+                       } else
+                               obj->efile.symbols = data;
+               }
                if (err)
                        goto out;
        }
-- 
1.8.3.4

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