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selftests/bpf: Workaround for llvm nop-4 bug
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>
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@ -3511,7 +3511,8 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
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sec_desc->sec_type = SEC_RELO;
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sec_desc->shdr = sh;
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sec_desc->data = data;
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} else if (sh->sh_type == SHT_NOBITS && strcmp(name, BSS_SEC) == 0) {
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} else if (sh->sh_type == SHT_NOBITS && (strcmp(name, BSS_SEC) == 0 ||
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str_has_pfx(name, BSS_SEC "."))) {
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sec_desc->sec_type = SEC_BSS;
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sec_desc->shdr = sh;
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sec_desc->data = data;
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@ -189,7 +189,7 @@ static void test_linked_list_success(int mode, bool leave_in_map)
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ASSERT_OK(ret, "global_list_push_pop");
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ASSERT_OK(opts.retval, "global_list_push_pop retval");
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if (!leave_in_map)
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clear_fields(skel->maps.data_A);
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clear_fields(skel->maps.bss_A);
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if (mode == PUSH_POP)
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goto end;
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@ -211,7 +211,7 @@ ppm:
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ASSERT_OK(ret, "global_list_push_pop_multiple");
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ASSERT_OK(opts.retval, "global_list_push_pop_multiple retval");
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if (!leave_in_map)
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clear_fields(skel->maps.data_A);
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clear_fields(skel->maps.bss_A);
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if (mode == PUSH_POP_MULT)
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goto end;
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@ -233,7 +233,7 @@ lil:
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ASSERT_OK(ret, "global_list_in_list");
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ASSERT_OK(opts.retval, "global_list_in_list retval");
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if (!leave_in_map)
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clear_fields(skel->maps.data_A);
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clear_fields(skel->maps.bss_A);
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end:
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linked_list__destroy(skel);
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}
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@ -47,7 +47,7 @@ struct {
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},
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};
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#define private(name) SEC(".data." #name) __hidden __attribute__((aligned(8)))
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#define private(name) SEC(".bss." #name) __hidden __attribute__((aligned(8)))
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private(A) struct bpf_spin_lock glock;
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private(A) struct bpf_list_head ghead __contains(foo, node);
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