From: Abhishek Dubey <[email protected]>
On loading the BPF program, the verifier might adjust/omit some
instructions. The adjusted instruction offset is accounted in the
map containing original instruction -> xlated mapping. This patch
add ppc64 JIT support to additionally build the xlated->jitted
mapping for every instruction present in instruction array. This
change is needed to enable support for indirect jumps, added in a
subsequent patch.
Invoke bpf_prog_update_insn_ptrs() with offset pair of xlated_offset
and jited_offset. The offset mapping is already available, which is
being used for bpf_prog_fill_jited_linfo() and can be directly used
for bpf_prog_update_insn_ptrs() as well.
Additional details present at:
commit b4ce5923e780 ("bpf, x86: add new map type: instructions array")
Signed-off-by: Abhishek Dubey <[email protected]>
---
arch/powerpc/net/bpf_jit_comp.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index ebd21c75ce47..04f51f2c817c 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -379,6 +379,12 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
jit_data->hdr = hdr;
}
+ /*
+ * The bpf_prog_update_insn_ptrs function expects addrs to
+ * point to the first byte of the jitted instruction.
+ */
+ bpf_prog_update_insn_ptrs(fp, addrs, fimage);
+
out:
if (bpf_blinded)
bpf_jit_prog_release_other(fp, fp == org_fp ? tmp_fp : org_fp);
--
2.52.0
