diff options
| author | Abhishek Dubey <adubey@linux.ibm.com> | 2026-04-01 18:21:30 +0300 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2026-04-03 11:44:25 +0300 |
| commit | 1e4bac7eb95a5a1aed5b39971ef77dca5b0f8a9f (patch) | |
| tree | 076d21383fe4766a183d1d0d67f82fd6c53cbad9 | |
| parent | 92258b5bf1ec10204c23a793793a65dc92d17014 (diff) | |
| download | linux-1e4bac7eb95a5a1aed5b39971ef77dca5b0f8a9f.tar.xz | |
powerpc/bpf: Add support for instruction array
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 <adubey@linux.ibm.com>
Acked-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260401152133.42544-2-adubey@linux.ibm.com
| -rw-r--r-- | arch/powerpc/net/bpf_jit_comp.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index b2fdf8ff9c60..50103b3794fb 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -373,6 +373,13 @@ skip_init_ctx: goto out_addrs; } bpf_prog_fill_jited_linfo(fp, addrs); + /* + * On ABI V1, executable code starts after the function + * descriptor, so adjust base accordingly. + */ + bpf_prog_update_insn_ptrs(fp, addrs, + (void *)fimage + FUNCTION_DESCR_SIZE); + out_addrs: if (!image && priv_stack_ptr) { fp->aux->priv_stack_ptr = NULL; |