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authorDaniel Borkmann <daniel@iogearbox.net>2018-11-26 14:05:38 +0100
committerAlexei Starovoitov <ast@kernel.org>2018-11-26 17:34:24 -0800
commite2c95a61656d29ceaac97b6a975c8a1f26e26f15 (patch)
tree8fb9a3cc00ef0b47edb7428d297bc921b39e1f2f /include
parent69500127424cd90ff2cf8191256b2ac3b0a4af56 (diff)
bpf, ppc64: generalize fetching subprog into bpf_jit_get_func_addr
Make fetching of the BPF call address from ppc64 JIT generic. ppc64 was using a slightly different variant rather than through the insns' imm field encoding as the target address would not fit into that space. Therefore, the target subprog number was encoded into the insns' offset and fetched through fp->aux->func[off]->bpf_func instead. Given there are other JITs with this issue and the mechanism of fetching the address is JIT-generic, move it into the core as a helper instead. On the JIT side, we get information on whether the retrieved address is a fixed one, that is, not changing through JIT passes, or a dynamic one. For the former, JITs can optimize their imm emission because this doesn't change jump offsets throughout JIT process. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Tested-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/filter.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h
index de629b706d1d..448dcc448f1f 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -866,6 +866,10 @@ void bpf_jit_binary_free(struct bpf_binary_header *hdr);
void bpf_jit_free(struct bpf_prog *fp);
+int bpf_jit_get_func_addr(const struct bpf_prog *prog,
+ const struct bpf_insn *insn, bool extra_pass,
+ u64 *func_addr, bool *func_addr_fixed);
+
struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);