[RFC PATCH v3 15/37] bpf tools: Collect symbol table from SHT_SYMTAB section

Wang Nan
2015-05-17T11:04:05Z

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

Signed-off-by: Wang Nan <wangnan0@huawei.com>
---
tools/lib/bpf/libbpf.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 43b22a5..2068f0b 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -94,6 +94,7 @@ struct bpf_object {
int fd;
Elf *elf;
GElf_Ehdr ehdr;
+ Elf_Data *symbols;
} elf;
};
#define obj_elf_valid(o) ((o)->elf.fd >= 0)
@@ -142,6 +143,8 @@ static void bpf_obj_clear_elf(struct bpf_object *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;
@@ -370,6 +373,14 @@ static int bpf_obj_elf_collect(struct bpf_object *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_warning("bpf: multiple SYMTAB in %s\n",
+ obj->path);
+ err = -EEXIST;
+ } else
+ obj->elf.symbols = data;
+ }
if (err)
goto out;
}
--
1.8.3.4