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e4bed26281
Emit error when BPF backend sees a call to a global function or to an external symbol. The kernel verifier only allows calls to predefined helpers from bpf.h which are defined in 'enum bpf_func_id'. Such calls in assembler must look like 'call [1-9]+' where number matches bpf_func_id. Signed-off-by: Alexei Starovoitov <ast@kernel.org> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292204 91177308-0d34-0410-b5e6-96231b3b80d8
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
//===-- BPFMCInstLower.h - Lower MachineInstr to MCInst ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_BPF_BPFMCINSTLOWER_H
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#define LLVM_LIB_TARGET_BPF_BPFMCINSTLOWER_H
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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class AsmPrinter;
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class MCContext;
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class MCInst;
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class MCOperand;
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class MCSymbol;
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class MachineInstr;
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class MachineModuleInfoMachO;
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class MachineOperand;
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class Mangler;
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// BPFMCInstLower - This class is used to lower an MachineInstr into an MCInst.
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class LLVM_LIBRARY_VISIBILITY BPFMCInstLower {
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MCContext &Ctx;
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AsmPrinter &Printer;
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public:
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BPFMCInstLower(MCContext &ctx, AsmPrinter &printer)
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: Ctx(ctx), Printer(printer) {}
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void Lower(const MachineInstr *MI, MCInst &OutMI) const;
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MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const;
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MCSymbol *GetGlobalAddressSymbol(const MachineOperand &MO) const;
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MCSymbol *GetExternalSymbolSymbol(const MachineOperand &MO) const;
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};
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}
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#endif
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