[RFC PATCH v9 11/50] bpf tools: Collect symbol table from SHT_SYMTAB section

From: Wang Nan
Date: Fri Jun 26 2015 - 10:30:36 EST


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

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Acked-by: Alexei Starovoitov <ast@xxxxxxxxxxxx>
---
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 87f5054..9b016c0 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -94,6 +94,7 @@ struct bpf_object {
size_t obj_buf_sz;
Elf *elf;
GElf_Ehdr ehdr;
+ Elf_Data *symbols;
} efile;
char path[];
};
@@ -135,6 +136,7 @@ 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);
obj->efile.obj_buf = NULL;
obj->efile.obj_buf_sz = 0;
@@ -333,6 +335,14 @@ 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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