On Wed, Aug 09, 2023 at 05:11:05PM +0530, Kumar Kartikeya Dwivedi wrote:
> +
> +static bool bpf_stack_walker(void *cookie, u64 ip, u64 sp, u64 bp)
> +{
> + struct bpf_throw_ctx *ctx = cookie;
> + struct bpf_prog *prog;
> +
> + if (!is_bpf_text_address(ip))
> + return !ctx->cnt;
> + prog = bpf_prog_ksym_find(ip);
> + ctx->cnt++;
> + if (!prog->aux->id)
> + return true;
> + ctx->aux = prog->aux;
> + ctx->sp = sp;
> + ctx->bp = bp;
> + return false;
> +}
Took me some time to understand what !prog->aux->id is doing.
Let's add a helper: is_subprog() and check:
prog->aux->func_idx != 0
since that's what arm64, x64, s390 JITs are using.
