+/*
+ * When not setting up our own stackframe, the redzone usage is:
+ *
+ * [ prev sp ] <-------------
+ * [ ... ] |
+ * sp (r1) ---> [ stack pointer ] --------------
+ * [ nv gpr save area ] 8*8
+ * [ tail_call_cnt ] 8
+ * [ local_tmp_var ] 8
+ * [ unused red zone ] 208 bytes protected
+ */
+static int bpf_jit_stack_local(struct codegen_context *ctx)
+{
+ if (bpf_has_stack_frame(ctx))
+ return STACK_FRAME_MIN_SIZE + MAX_BPF_STACK;
+ else
+ return -(BPF_PPC_STACK_SAVE + 16);
+}
+
+static int bpf_jit_stack_offsetof(struct codegen_context *ctx, int reg)
+{
+ if (reg >= BPF_PPC_NVR_MIN && reg < 32)
+ return (bpf_has_stack_frame(ctx) ? BPF_PPC_STACKFRAME : 0)
+ - (8 * (32 - reg));
+
+ pr_err("BPF JIT is asking about unknown registers");
+ BUG();
+}
+