linux-kernel - [RFC PATCH v5 11/30] bpf tools: Collect symbol table from SHT

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Message-ID: <1433144296-74992-12-git-send-email-wangnan0@huawei.com>
Date:	Mon, 1 Jun 2015 07:37:57 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<namhyung@...nel.org>, <alexei.starovoitov@...il.com>,
	<masami.hiramatsu.pt@...achi.com>, <acme@...nel.org>,
	<paulus@...ba.org>, <a.p.zijlstra@...llo.nl>, <mingo@...hat.com>,
	<jolsa@...nel.org>, <dsahern@...il.com>, <daniel@...earbox.net>,
	<brendan.d.gregg@...il.com>
CC:	<lizefan@...wei.com>, <hekuang@...wei.com>, <xiakaixu@...wei.com>,
	<linux-kernel@...r.kernel.org>, <pi3orama@....com>
Subject: [RFC PATCH v5 11/30] bpf tools: Collect symbol table from SHT_SYMTAB section

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

Signed-off-by: Wang Nan <wangnan0@...wei.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 5f9b3da..9d40f27 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -92,6 +92,7 @@ struct bpf_object {
 		int fd;
 		Elf *elf;
 		GElf_Ehdr ehdr;
+		Elf_Data *symbols;
 	} efile;
 	char path[];
 };
@@ -121,6 +122,7 @@ 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);
 }
 
@@ -306,6 +308,14 @@ 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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