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