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selftests/bpf: Workaround for llvm nop-4 bug

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Currently LLVM fails to recognize .data.* as data section and defaults to .text
section. Later BPF backend tries to emit 4-byte NOP instruction which doesn't
exist in BPF ISA and aborts.
The fix for LLVM is pending:
https://reviews.llvm.org/D138477

While waiting for the fix lets workaround the linked_list test case
by using .bss.* prefix which is properly recognized by LLVM as BSS section.

Fix libbpf to support .bss. prefix and adjust tests.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov
2022-11-22 09:15:29 -08:00
committed by Andrii Nakryiko
parent 95959419a7
commit ca515c0dda
1 changed files with 2 additions and 1 deletions
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src/libbpf.c
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@@ -3511,7 +3511,8 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
sec_desc->sec_type = SEC_RELO;
sec_desc->shdr = sh;
sec_desc->data = data;
} else if (sh->sh_type == SHT_NOBITS && strcmp(name, BSS_SEC) == 0) {
} else if (sh->sh_type == SHT_NOBITS && (strcmp(name, BSS_SEC) == 0 ||
str_has_pfx(name, BSS_SEC "."))) {
sec_desc->sec_type = SEC_BSS;
sec_desc->shdr = sh;
sec_desc->data = data;