diff options
| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2023-01-28 01:06:44 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-01-28 21:45:15 +0100 |
| commit | 49f67f393ff264e8d83f6fcec0728a6aa8eed102 (patch) | |
| tree | b3cad5557e5b3ade5b4d42bf63b14dddf66e49f5 /kernel/bpf | |
| parent | bpf: iterators: Split iterators.lskel.h into little- and big- endian versions (diff) | |
| download | linux-49f67f393ff264e8d83f6fcec0728a6aa8eed102.tar.xz linux-49f67f393ff264e8d83f6fcec0728a6aa8eed102.zip | |
bpf: btf: Add BTF_FMODEL_SIGNED_ARG flag
s390x eBPF JIT needs to know whether a function return value is signed
and which function arguments are signed, in order to generate code
compliant with the s390x ABI.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20230128000650.1516334-26-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/btf.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 47b8cb96f2c2..1622a3b15d6f 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -6453,6 +6453,18 @@ static int __get_type_size(struct btf *btf, u32 btf_id, return -EINVAL; } +static u8 __get_type_fmodel_flags(const struct btf_type *t) +{ + u8 flags = 0; + + if (__btf_type_is_struct(t)) + flags |= BTF_FMODEL_STRUCT_ARG; + if (btf_type_is_signed_int(t)) + flags |= BTF_FMODEL_SIGNED_ARG; + + return flags; +} + int btf_distill_func_proto(struct bpf_verifier_log *log, struct btf *btf, const struct btf_type *func, @@ -6473,6 +6485,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log, m->arg_flags[i] = 0; } m->ret_size = 8; + m->ret_flags = 0; m->nr_args = MAX_BPF_FUNC_REG_ARGS; return 0; } @@ -6492,6 +6505,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log, return -EINVAL; } m->ret_size = ret; + m->ret_flags = __get_type_fmodel_flags(t); for (i = 0; i < nargs; i++) { if (i == nargs - 1 && args[i].type == 0) { @@ -6516,7 +6530,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log, return -EINVAL; } m->arg_size[i] = ret; - m->arg_flags[i] = __btf_type_is_struct(t) ? BTF_FMODEL_STRUCT_ARG : 0; + m->arg_flags[i] = __get_type_fmodel_flags(t); } m->nr_args = nargs; return 0; |