From: Wang Nan <wangnan0@huawei.com>
To: <acme@kernel.org>, <ast@plumgrid.com>,
<brendan.d.gregg@gmail.com>, <daniel@iogearbox.net>,
<namhyung@kernel.org>, <masami.hiramatsu.pt@hitachi.com>,
<paulus@samba.org>, <a.p.zijlstra@chello.nl>, <mingo@redhat.com>,
<jolsa@kernel.org>, <dsahern@gmail.com>
Cc: <linux-kernel@vger.kernel.org>, <lizefan@huawei.com>,
<hekuang@huawei.com>, <xiakaixu@huawei.com>, <pi3orama@163.com>
Subject: [RFC PATCH v6 10/32] bpf tools: Collect symbol table from SHT_SYMTAB section
Date: Tue, 9 Jun 2015 05:50:14 +0000 [thread overview]
Message-ID: <1433829036-23687-11-git-send-email-wangnan0@huawei.com> (raw)
In-Reply-To: <1433829036-23687-1-git-send-email-wangnan0@huawei.com>
This patch collects symbols section. This section is useful when
linking ELF maps.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.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 3315f00..77ad7d3 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;
@@ -332,6 +334,14 @@ 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
next prev parent reply other threads:[~2015-06-09 5:58 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-09 5:50 [RFC PATCH v6 00/32] perf tools: filtering events using eBPF programs Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 01/32] tools build: Add feature check for eBPF API Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 02/32] bpf tools: Introduce 'bpf' library to tools Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 03/32] bpf tools: Allow caller to set printing function Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 04/32] bpf tools: Open eBPF object file and do basic validation Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 05/32] bpf tools: Read eBPF object from buffer Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 06/32] bpf tools: Check endianess and make libbpf fail early Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 07/32] bpf tools: Iterate over ELF sections to collect information Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 08/32] bpf tools: Collect version and license from ELF sections Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 09/32] bpf tools: Collect map definitions from 'maps' section Wang Nan
2015-06-09 5:50 ` Wang Nan [this message]
2015-06-09 5:50 ` [RFC PATCH v6 11/32] bpf tools: Collect eBPF programs from their own sections Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 12/32] bpf tools: Collect relocation sections from SHT_REL sections Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 13/32] bpf tools: Record map accessing instructions for each program Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 14/32] bpf tools: Add bpf.c/h for common bpf operations Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 15/32] bpf tools: Create eBPF maps defined in an object file Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 16/32] bpf tools: Relocate eBPF programs Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 17/32] bpf tools: Introduce bpf_load_program() to bpf.c Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 18/32] bpf tools: Load eBPF programs in object files into kernel Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 19/32] bpf tools: Introduce accessors for struct bpf_program Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 20/32] bpf tools: Introduce accessors for struct bpf_object Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 21/32] bpf tools: Link all bpf objects onto a list Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 22/32] perf tools: Make perf depend on libbpf Wang Nan
2015-06-09 10:29 ` Wangnan (F)
2015-06-09 5:50 ` [RFC PATCH v6 23/32] perf record: Enable passing bpf object file to --event Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 24/32] perf record: Compile scriptlets if pass '.c' " Wang Nan
2015-06-09 21:48 ` Alexei Starovoitov
2015-06-10 0:06 ` Wangnan (F)
2015-06-10 0:28 ` Alexei Starovoitov
2015-06-11 7:19 ` Namhyung Kim
2015-06-11 7:35 ` Wangnan (F)
2015-06-11 17:42 ` Alexei Starovoitov
2015-06-09 5:50 ` [RFC PATCH v6 25/32] perf tools: Add 'bpf.' config section to perf default config Wang Nan
2015-06-09 23:43 ` Alexei Starovoitov
2015-06-10 0:47 ` Wangnan (F)
2015-06-10 1:09 ` Alexei Starovoitov
2015-06-10 2:23 ` Wangnan (F)
2015-06-10 3:55 ` Alexei Starovoitov
2015-06-11 7:45 ` Namhyung Kim
2015-06-11 8:09 ` Wangnan (F)
2015-06-11 14:50 ` Namhyung Kim
2015-06-09 5:50 ` [RFC PATCH v6 26/32] perf tools: Parse probe points of eBPF programs during preparation Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 27/32] perf probe: Attach trace_probe_event with perf_probe_event Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 28/32] perf record: Probe at kprobe points Wang Nan
2015-06-11 14:32 ` Namhyung Kim
2015-06-09 5:50 ` [RFC PATCH v6 29/32] perf record: Load all eBPF object into kernel Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 30/32] perf tools: Add bpf_fd field to evsel and config it Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 31/32] perf tools: Attach eBPF program to perf event Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 32/32] perf record: Add LLVM options for compiling BPF scripts Wang Nan
2015-06-09 13:32 ` Wangnan (F)
2015-06-10 0:02 ` Alexei Starovoitov
2015-06-10 0:17 ` Wangnan (F)
2015-06-10 1:34 ` Alexei Starovoitov
2015-06-09 13:59 ` [RFC PATCH v6 00/32] perf tools: filtering events using eBPF programs Arnaldo Carvalho de Melo
2015-06-09 23:45 ` Wangnan (F)
2015-06-09 21:30 ` Alexei Starovoitov
2015-06-09 21:44 ` Arnaldo Carvalho de Melo
2015-06-09 23:16 ` Alexei Starovoitov
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