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1//===-- M68kCallingConv.td - Calling Conventions for M68k --*- tablegen -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8///9/// \file10/// This describes the calling conventions for the M68k architectures. These11/// conventions assume Int to be 4 bytes and 4 byte aligned.12///13//===----------------------------------------------------------------------===//14 15// TODO Verify C convention follows SysV M68K ABI16 17class CCIfSubtarget<string F, CCAction A>18 : CCIf<!strconcat("State.getMachineFunction()."19 "getSubtarget<M68kSubtarget>().", F), A>;20 21//===----------------------------------------------------------------------===//22// Return Value Calling Conventions23//===----------------------------------------------------------------------===//24 25/// M68k C return convention.26def RetCC_M68k_C : CallingConv<[27 CCIfPtr<CCAssignToReg<[A0]>>,28 CCIfType<[i1], CCPromoteToType<i8>>,29 CCIfType<[i8], CCAssignToReg<[BD0, BD1]>>,30 CCIfType<[i16], CCAssignToReg<[WD0, WD1]>>,31 CCIfType<[i32], CCAssignToReg<[D0, D1]>>,32]>;33 34/// M68k fastcc return convention.35/// This convention allows to return up to 16 bytes in registers which can be36/// split among 16 1-byte values or used for a single 16-byte value.37/// TODO: Verify its functionality and write tests38def RetCC_M68k_Fast : CallingConv<[39 CCIfPtr<CCAssignToReg<[A0]>>,40 CCIfType<[i1], CCPromoteToType<i8>>,41 CCIfType<[i8], CCAssignToReg<[BD0, BD1]>>,42 CCIfType<[i16], CCAssignToReg<[WD0, WD1, WA0, WA1]>>,43 CCIfType<[i32], CCAssignToReg<[D0, D1, A0, A1]>>,44]>;45 46/// This is the root return-value convention for the M68k backend.47def RetCC_M68k : CallingConv<[48 CCIfCC<"CallingConv::Fast", CCDelegateTo<RetCC_M68k_Fast>>,49 CCDelegateTo<RetCC_M68k_C>50]>;51 52//===----------------------------------------------------------------------===//53// M68k C Calling Convention54//===----------------------------------------------------------------------===//55 56/// CC_M68k_Common - In all M68k calling conventions, extra integers and FP57/// values are spilled on the stack.58def CC_M68k_Common : CallingConv<[59 /// Handles byval parameters.60 CCIfByVal<CCPassByVal<4, 4>>,61 62 /// Integer values get stored in stack slots that are 4 bytes in63 /// size and 4-byte aligned.64 CCIfType<[i32], CCAssignToStack<4, 4>>65]>;66 67def CC_M68k_Fast : CallingConv<[68 /// Promote i1/i8/i16 arguments to i32.69 CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,70 71 /// The 'nest' parameter, if any, is passed in A1.72 CCIfNest<CCAssignToReg<[A1]>>, // FIXME verify if this is correct73 74 /// Since M68k uses %An for pointers and we want them be passed in regs75 /// too we have to use custom function.76 CCIfType<[i32], CCCustom<"CC_M68k_Any_AssignToReg">>,77 78 /// Otherwise, same as everything else.79 CCDelegateTo<CC_M68k_Common>80]>;81 82def CC_M68k_C : CallingConv<[83 /// Promote i1/i8/i16 arguments to i32.84 CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,85 86 /// The 'nest' parameter, if any, is passed in A1.87 CCIfNest<CCAssignToReg<[A1]>>, // FIXME verify if this is correct88 89 /// Use registers only if 'inreg' used and the call is not vararg90 CCIfNotVarArg<CCIfInReg<CCIfType<[i32], CCAssignToReg<[D0, D1]>>>>,91 92 // TODO: Support for 'sret'93 94 /// Otherwise, same as everything else.95 CCDelegateTo<CC_M68k_Common>96]>;97 98/// This is the root argument convention for the M68k backend.99def CC_M68k : CallingConv<[100 CCIfCC<"CallingConv::Fast", CCDelegateTo<CC_M68k_Fast>>,101 CCDelegateTo<CC_M68k_C>102]>;103 104//===----------------------------------------------------------------------===//105// Callee-saved Registers.106//===----------------------------------------------------------------------===//107 108def CSR_NoRegs : CalleeSavedRegs<(add)>;109 110// A5 - BP111// A6 - FP112def CSR_STD : CalleeSavedRegs<(add D2, D3, D4, D5, D6, D7,113 A2, A3, A4, A5, A6)>;114 115