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//===-- BPFCallingConv.td - Calling Conventions BPF --------*- tablegen -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This describes the calling conventions for the BPF architecture.
//
//===----------------------------------------------------------------------===//
// BPF 64-bit C return-value convention.
def RetCC_BPF64 : CallingConv<[CCIfType<[i64], CCAssignToReg<[R0]>>]>;
// BPF 64-bit C Calling convention.
def CC_BPF64 : CallingConv<[
// Promote i8/i16/i32 args to i64
CCIfType<[ i8, i16, i32 ], CCPromoteToType<i64>>,
// All arguments get passed in integer registers if there is space.
CCIfType<[i64], CCAssignToReg<[ R1, R2, R3, R4, R5 ]>>,
// Could be assigned to the stack in 8-byte aligned units, but unsupported
CCAssignToStack<8, 8>
]>;
// Return-value convention when -mattr=+alu32 enabled
def RetCC_BPF32 : CallingConv<[
CCIfType<[i32], CCAssignToRegWithShadow<[W0], [R0]>>,
CCIfType<[i64], CCAssignToRegWithShadow<[R0], [W0]>>
]>;
// Calling convention when -mattr=+alu32 enabled
def CC_BPF32 : CallingConv<[
// Promote i8/i16/i32 args to i64
CCIfType<[i32], CCAssignToRegWithShadow<[W1, W2, W3, W4, W5],
[R1, R2, R3, R4, R5]>>,
// All arguments get passed in integer registers if there is space.
CCIfType<[i64], CCAssignToRegWithShadow<[R1, R2, R3, R4, R5],
[W1, W2, W3, W4, W5]>>,
// Could be assigned to the stack in 8-byte aligned units, but unsupported
CCAssignToStack<8, 8>
]>;
def CSR : CalleeSavedRegs<(add R6, R7, R8, R9, R10)>;
def CSR_PreserveAll : CalleeSavedRegs<(add R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10)>;
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