diff mbox series

[v6,bpf-next,6/9] resolve_btfids: handle presence of .BTF.base section

Message ID 20240613095014.357981-7-alan.maguire@oracle.com (mailing list archive)
State Accepted
Commit 6ba77385f386053cea2a1cad33717de74a26db4e
Delegated to: BPF
Headers show
Series bpf: support resilient split BTF | expand

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Commit Message

Alan Maguire June 13, 2024, 9:50 a.m. UTC 
Now that btf_parse_elf() handles .BTF.base section presence,
we need to ensure that resolve_btfids uses .BTF.base when present
rather than the vmlinux base BTF passed in via the -B option.
Detect .BTF.base section presence and unset the base BTF path
to ensure that BTF ELF parsing will do the right thing.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
 tools/bpf/resolve_btfids/main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

Comments

Eduard Zingerman June 14, 2024, 1:19 a.m. UTC | #1 
On Thu, 2024-06-13 at 10:50 +0100, Alan Maguire wrote:
> Now that btf_parse_elf() handles .BTF.base section presence,
> we need to ensure that resolve_btfids uses .BTF.base when present
> rather than the vmlinux base BTF passed in via the -B option.
> Detect .BTF.base section presence and unset the base BTF path
> to ensure that BTF ELF parsing will do the right thing.
> 
> Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
> ---

Reviewed-by: Eduard Zingerman <eddyz87@gmail.com>

[...]
diff mbox series

Patch

diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
index af393c7dee1f..936ef95c3d32 100644
--- a/tools/bpf/resolve_btfids/main.c
+++ b/tools/bpf/resolve_btfids/main.c
@@ -409,6 +409,14 @@  static int elf_collect(struct object *obj)
 			obj->efile.idlist       = data;
 			obj->efile.idlist_shndx = idx;
 			obj->efile.idlist_addr  = sh.sh_addr;
+		} else if (!strcmp(name, BTF_BASE_ELF_SEC)) {
+			/* If a .BTF.base section is found, do not resolve
+			 * BTF ids relative to vmlinux; resolve relative
+			 * to the .BTF.base section instead.  btf__parse_split()
+			 * will take care of this once the base BTF it is
+			 * passed is NULL.
+			 */
+			obj->base_btf_path = NULL;
 		}
 
 		if (compressed_section_fix(elf, scn, &sh))