Commit 1e4bac7e authored by Abhishek Dubey's avatar Abhishek Dubey Committed by Madhavan Srinivasan
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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 b4ce5923 ("bpf, x86: add new map type: instructions array")

Signed-off-by: default avatarAbhishek Dubey <adubey@linux.ibm.com>
Acked-by: default avatarHari Bathini <hbathini@linux.ibm.com>
Signed-off-by: default avatarMadhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260401152133.42544-2-adubey@linux.ibm.com
parent 92258b5b

arch/powerpc/net/bpf_jit_comp.c

+7 −0
Original line number Diff line number Diff line
@@ -373,6 +373,13 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) 
			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;