Eduard Zingerman <eddyz87@xxxxxxxxx> writes: > On Mon, 2025-08-25 at 21:27 +0200, Puranjay Mohan wrote: > > [...] > >> Hi Eduard, >> >> You were right, I have verified that the program is hitting the 0xfff >> boundary while doing the call to bpf_skb_load_helper_32 >> While jiting this call, emit_a32_mov_i(tmp[1], func, ctx); is called, >> where this issue it triggered. >> >> The offset in imm_offset() is calculated as: >> ctx->offsets[ctx->prog->len - 1] * 4 + ctx->prologue_bytes + >> ctx->epilogue_bytes + imm_i * 4 >> >> For this program, ctx->offsets[ctx->prog->len - 1] * 4 itself is >> 0x1400 which is above 0xfff boundary. >> So, this is not a bug and expected behaviour with the current >> implementation of the JIT. >> >> For now, we can merge this and later I will try to improve the JIT so >> it works for bigger programs. > > Hi Puranjay, > > Thank you for checking this! > What do you think about this test case, do we need it in the suite? I don't think that we need this test as it is based on a missing feature in the JIT. Once the arm JIT is improved, this test will silently stop testing what it is supposed to test (fallback to interpreter). Thanks, Puranjay
