3d59d94a20
I have matched the RISCV backend, which only uses the interrupt save list in getCalleeSavedRegs, _not_ in getCallPreservedMask. I don't know the details of these two methods, but with it, the correct amount of registers is saved and restored. Without this patch, practically all interrupt handlers that call a function will miscompile. I have added a test to verify this behavior. I've also added a very simple test to verify that more normal interrupt operations (in this case, incrementing a global value) behave as expected. Differential Revision: https://reviews.llvm.org/D116551
40 lines
1.7 KiB
TableGen
40 lines
1.7 KiB
TableGen
//===-- AVRCallingConv.td - Calling Conventions for AVR ----*- 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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// This describes the calling conventions for AVR architecture.
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// Normal functions use a special calling convention, solved in code.
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// AVR Return Value Calling Convention
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//===----------------------------------------------------------------------===//
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// Special return value calling convention for runtime functions.
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def RetCC_AVR_BUILTIN : CallingConv<[
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CCIfType<[i8], CCAssignToReg<[R24, R25]>>,
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CCIfType<[i16], CCAssignToReg<[R23R22, R25R24]>>
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]>;
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//===----------------------------------------------------------------------===//
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// AVR Argument Calling Conventions
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//===----------------------------------------------------------------------===//
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// The calling conventions are implemented in custom C++ code
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// Calling convention for variadic functions.
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def ArgCC_AVR_Vararg : CallingConv<[
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// i16 are always passed through the stack with an alignment of 1.
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CCAssignToStack<2, 1>
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]>;
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//===----------------------------------------------------------------------===//
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// Callee-saved register lists.
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//===----------------------------------------------------------------------===//
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def CSR_Normal : CalleeSavedRegs<(add R29, R28, (sequence "R%u", 17, 2))>;
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def CSR_Interrupts : CalleeSavedRegs<(add(sequence "R%u", 31, 2))>;
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