10b57cec5SDimitry Andric//===-- AVRCallingConv.td - Calling Conventions for AVR ----*- tablegen -*-===// 20b57cec5SDimitry Andric// 30b57cec5SDimitry Andric// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric// See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric// 70b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric// This describes the calling conventions for AVR architecture. 95ffd83dbSDimitry Andric// Normal functions use a special calling convention, solved in code. 100b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 110b57cec5SDimitry Andric 120b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 130b57cec5SDimitry Andric// AVR Return Value Calling Convention 140b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 150b57cec5SDimitry Andric 160b57cec5SDimitry Andric// Special return value calling convention for runtime functions. 17*349cc55cSDimitry Andricdef RetCC_AVR_BUILTIN : CallingConv<[ 180b57cec5SDimitry Andric CCIfType<[i8], CCAssignToReg<[R24, R25]>>, 190b57cec5SDimitry Andric CCIfType<[i16], CCAssignToReg<[R23R22, R25R24]>> 200b57cec5SDimitry Andric]>; 210b57cec5SDimitry Andric 220b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 230b57cec5SDimitry Andric// AVR Argument Calling Conventions 240b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 250b57cec5SDimitry Andric 260b57cec5SDimitry Andric// The calling conventions are implemented in custom C++ code 270b57cec5SDimitry Andric 280b57cec5SDimitry Andric// Calling convention for variadic functions. 29*349cc55cSDimitry Andricdef ArgCC_AVR_Vararg : CallingConv<[ 300b57cec5SDimitry Andric // i16 are always passed through the stack with an alignment of 1. 310b57cec5SDimitry Andric CCAssignToStack<2, 1> 320b57cec5SDimitry Andric]>; 330b57cec5SDimitry Andric 340b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 350b57cec5SDimitry Andric// Callee-saved register lists. 360b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 370b57cec5SDimitry Andric 380b57cec5SDimitry Andricdef CSR_Normal : CalleeSavedRegs<(add R29, R28, (sequence "R%u", 17, 2))>; 390b57cec5SDimitry Andricdef CSR_Interrupts : CalleeSavedRegs<(add(sequence "R%u", 31, 0))>; 40