347 lines
10 KiB
C++
347 lines
10 KiB
C++
//===- Mips.cpp ----------------------------------------------------------===//
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//
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// The LLVM Linker
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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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//
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// This file contains a helper function for the Writer.
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//
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//===---------------------------------------------------------------------===//
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#include "Error.h"
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#include "InputFiles.h"
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#include "SymbolTable.h"
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#include "Writer.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/MipsABIFlags.h"
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using namespace llvm;
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using namespace llvm::object;
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using namespace llvm::ELF;
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using namespace lld;
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using namespace lld::elf;
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namespace {
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struct ArchTreeEdge {
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uint32_t Child;
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uint32_t Parent;
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};
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struct FileFlags {
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StringRef Filename;
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uint32_t Flags;
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};
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}
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static StringRef getAbiName(uint32_t Flags) {
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switch (Flags) {
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case 0:
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return "n64";
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case EF_MIPS_ABI2:
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return "n32";
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case EF_MIPS_ABI_O32:
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return "o32";
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case EF_MIPS_ABI_O64:
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return "o64";
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case EF_MIPS_ABI_EABI32:
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return "eabi32";
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case EF_MIPS_ABI_EABI64:
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return "eabi64";
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default:
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return "unknown";
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}
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}
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static StringRef getNanName(bool IsNan2008) {
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return IsNan2008 ? "2008" : "legacy";
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}
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static StringRef getFpName(bool IsFp64) { return IsFp64 ? "64" : "32"; }
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static void checkFlags(ArrayRef<FileFlags> Files) {
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uint32_t ABI = Files[0].Flags & (EF_MIPS_ABI | EF_MIPS_ABI2);
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bool Nan = Files[0].Flags & EF_MIPS_NAN2008;
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bool Fp = Files[0].Flags & EF_MIPS_FP64;
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for (const FileFlags &F : Files.slice(1)) {
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uint32_t ABI2 = F.Flags & (EF_MIPS_ABI | EF_MIPS_ABI2);
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if (ABI != ABI2)
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error("target ABI '" + getAbiName(ABI) + "' is incompatible with '" +
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getAbiName(ABI2) + "': " + F.Filename);
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bool Nan2 = F.Flags & EF_MIPS_NAN2008;
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if (Nan != Nan2)
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error("target -mnan=" + getNanName(Nan) + " is incompatible with -mnan=" +
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getNanName(Nan2) + ": " + F.Filename);
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bool Fp2 = F.Flags & EF_MIPS_FP64;
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if (Fp != Fp2)
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error("target -mfp" + getFpName(Fp) + " is incompatible with -mfp" +
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getFpName(Fp2) + ": " + F.Filename);
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}
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}
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static uint32_t getMiscFlags(ArrayRef<FileFlags> Files) {
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uint32_t Ret = 0;
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for (const FileFlags &F : Files)
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Ret |= F.Flags &
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(EF_MIPS_ABI | EF_MIPS_ABI2 | EF_MIPS_ARCH_ASE | EF_MIPS_NOREORDER |
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EF_MIPS_MICROMIPS | EF_MIPS_NAN2008 | EF_MIPS_32BITMODE);
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return Ret;
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}
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static uint32_t getPicFlags(ArrayRef<FileFlags> Files) {
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// Check PIC/non-PIC compatibility.
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bool IsPic = Files[0].Flags & (EF_MIPS_PIC | EF_MIPS_CPIC);
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for (const FileFlags &F : Files.slice(1)) {
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bool IsPic2 = F.Flags & (EF_MIPS_PIC | EF_MIPS_CPIC);
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if (IsPic && !IsPic2)
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warning("linking abicalls code with non-abicalls file: " + F.Filename);
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if (!IsPic && IsPic2)
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warning("linking non-abicalls code with abicalls file: " + F.Filename);
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}
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// Compute the result PIC/non-PIC flag.
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uint32_t Ret = Files[0].Flags & (EF_MIPS_PIC | EF_MIPS_CPIC);
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for (const FileFlags &F : Files.slice(1))
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Ret &= F.Flags & (EF_MIPS_PIC | EF_MIPS_CPIC);
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// PIC code is inherently CPIC and may not set CPIC flag explicitly.
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if (Ret & EF_MIPS_PIC)
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Ret |= EF_MIPS_CPIC;
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return Ret;
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}
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static ArchTreeEdge ArchTree[] = {
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// MIPS32R6 and MIPS64R6 are not compatible with other extensions
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// MIPS64R2 extensions.
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{EF_MIPS_ARCH_64R2 | EF_MIPS_MACH_OCTEON3, EF_MIPS_ARCH_64R2},
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{EF_MIPS_ARCH_64R2 | EF_MIPS_MACH_OCTEON2, EF_MIPS_ARCH_64R2},
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{EF_MIPS_ARCH_64R2 | EF_MIPS_MACH_OCTEON, EF_MIPS_ARCH_64R2},
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{EF_MIPS_ARCH_64R2 | EF_MIPS_MACH_LS3A, EF_MIPS_ARCH_64R2},
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// MIPS64 extensions.
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{EF_MIPS_ARCH_64 | EF_MIPS_MACH_SB1, EF_MIPS_ARCH_64},
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{EF_MIPS_ARCH_64 | EF_MIPS_MACH_XLR, EF_MIPS_ARCH_64},
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{EF_MIPS_ARCH_64R2, EF_MIPS_ARCH_64},
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// MIPS V extensions.
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{EF_MIPS_ARCH_64, EF_MIPS_ARCH_5},
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// R5000 extensions.
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{EF_MIPS_ARCH_4 | EF_MIPS_MACH_5500, EF_MIPS_ARCH_4 | EF_MIPS_MACH_5400},
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// MIPS IV extensions.
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{EF_MIPS_ARCH_4 | EF_MIPS_MACH_5400, EF_MIPS_ARCH_4},
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{EF_MIPS_ARCH_4 | EF_MIPS_MACH_9000, EF_MIPS_ARCH_4},
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{EF_MIPS_ARCH_5, EF_MIPS_ARCH_4},
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// VR4100 extensions.
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{EF_MIPS_ARCH_3 | EF_MIPS_MACH_4111, EF_MIPS_ARCH_3 | EF_MIPS_MACH_4100},
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{EF_MIPS_ARCH_3 | EF_MIPS_MACH_4120, EF_MIPS_ARCH_3 | EF_MIPS_MACH_4100},
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// MIPS III extensions.
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{EF_MIPS_ARCH_3 | EF_MIPS_MACH_4010, EF_MIPS_ARCH_3},
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{EF_MIPS_ARCH_3 | EF_MIPS_MACH_4100, EF_MIPS_ARCH_3},
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{EF_MIPS_ARCH_3 | EF_MIPS_MACH_4650, EF_MIPS_ARCH_3},
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{EF_MIPS_ARCH_3 | EF_MIPS_MACH_5900, EF_MIPS_ARCH_3},
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{EF_MIPS_ARCH_3 | EF_MIPS_MACH_LS2E, EF_MIPS_ARCH_3},
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{EF_MIPS_ARCH_3 | EF_MIPS_MACH_LS2F, EF_MIPS_ARCH_3},
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{EF_MIPS_ARCH_4, EF_MIPS_ARCH_3},
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// MIPS32 extensions.
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{EF_MIPS_ARCH_32R2, EF_MIPS_ARCH_32},
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// MIPS II extensions.
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{EF_MIPS_ARCH_3, EF_MIPS_ARCH_2},
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{EF_MIPS_ARCH_32, EF_MIPS_ARCH_2},
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// MIPS I extensions.
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{EF_MIPS_ARCH_1 | EF_MIPS_MACH_3900, EF_MIPS_ARCH_1},
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{EF_MIPS_ARCH_2, EF_MIPS_ARCH_1},
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};
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static bool isArchMatched(uint32_t New, uint32_t Res) {
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if (New == Res)
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return true;
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if (New == EF_MIPS_ARCH_32 && isArchMatched(EF_MIPS_ARCH_64, Res))
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return true;
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if (New == EF_MIPS_ARCH_32R2 && isArchMatched(EF_MIPS_ARCH_64R2, Res))
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return true;
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for (const auto &Edge : ArchTree) {
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if (Res == Edge.Child) {
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Res = Edge.Parent;
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if (Res == New)
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return true;
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}
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}
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return false;
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}
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static StringRef getMachName(uint32_t Flags) {
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switch (Flags & EF_MIPS_MACH) {
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case EF_MIPS_MACH_NONE:
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return "";
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case EF_MIPS_MACH_3900:
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return "r3900";
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case EF_MIPS_MACH_4010:
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return "r4010";
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case EF_MIPS_MACH_4100:
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return "r4100";
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case EF_MIPS_MACH_4650:
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return "r4650";
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case EF_MIPS_MACH_4120:
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return "r4120";
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case EF_MIPS_MACH_4111:
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return "r4111";
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case EF_MIPS_MACH_5400:
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return "vr5400";
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case EF_MIPS_MACH_5900:
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return "vr5900";
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case EF_MIPS_MACH_5500:
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return "vr5500";
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case EF_MIPS_MACH_9000:
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return "rm9000";
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case EF_MIPS_MACH_LS2E:
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return "loongson2e";
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case EF_MIPS_MACH_LS2F:
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return "loongson2f";
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case EF_MIPS_MACH_LS3A:
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return "loongson3a";
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case EF_MIPS_MACH_OCTEON:
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return "octeon";
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case EF_MIPS_MACH_OCTEON2:
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return "octeon2";
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case EF_MIPS_MACH_OCTEON3:
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return "octeon3";
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case EF_MIPS_MACH_SB1:
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return "sb1";
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case EF_MIPS_MACH_XLR:
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return "xlr";
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default:
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return "unknown machine";
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}
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}
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static StringRef getArchName(uint32_t Flags) {
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StringRef S = getMachName(Flags);
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if (!S.empty())
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return S;
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switch (Flags & EF_MIPS_ARCH) {
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case EF_MIPS_ARCH_1:
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return "mips1";
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case EF_MIPS_ARCH_2:
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return "mips2";
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case EF_MIPS_ARCH_3:
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return "mips3";
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case EF_MIPS_ARCH_4:
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return "mips4";
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case EF_MIPS_ARCH_5:
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return "mips5";
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case EF_MIPS_ARCH_32:
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return "mips32";
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case EF_MIPS_ARCH_64:
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return "mips64";
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case EF_MIPS_ARCH_32R2:
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return "mips32r2";
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case EF_MIPS_ARCH_64R2:
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return "mips64r2";
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case EF_MIPS_ARCH_32R6:
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return "mips32r6";
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case EF_MIPS_ARCH_64R6:
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return "mips64r6";
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default:
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return "unknown arch";
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}
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}
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// There are (arguably too) many MIPS ISAs out there. Their relationships
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// can be represented as a forest. If all input files have ISAs which
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// reachable by repeated proceeding from the single child to the parent,
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// these input files are compatible. In that case we need to return "highest"
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// ISA. If there are incompatible input files, we show an error.
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// For example, mips1 is a "parent" of mips2 and such files are compatible.
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// Output file gets EF_MIPS_ARCH_2 flag. From the other side mips3 and mips32
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// are incompatible because nor mips3 is a parent for misp32, nor mips32
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// is a parent for mips3.
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static uint32_t getArchFlags(ArrayRef<FileFlags> Files) {
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uint32_t Ret = Files[0].Flags & (EF_MIPS_ARCH | EF_MIPS_MACH);
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for (const FileFlags &F : Files.slice(1)) {
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uint32_t New = F.Flags & (EF_MIPS_ARCH | EF_MIPS_MACH);
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// Check ISA compatibility.
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if (isArchMatched(New, Ret))
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continue;
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if (!isArchMatched(Ret, New)) {
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error("target ISA '" + getArchName(Ret) + "' is incompatible with '" +
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getArchName(New) + "': " + F.Filename);
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return 0;
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}
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Ret = New;
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}
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return Ret;
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}
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template <class ELFT> uint32_t elf::getMipsEFlags() {
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std::vector<FileFlags> V;
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for (elf::ObjectFile<ELFT> *F : Symtab<ELFT>::X->getObjectFiles())
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V.push_back({F->getName(), F->getObj().getHeader()->e_flags});
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checkFlags(V);
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return getMiscFlags(V) | getPicFlags(V) | getArchFlags(V);
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}
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static int compareMipsFpAbi(uint8_t FpA, uint8_t FpB) {
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if (FpA == FpB)
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return 0;
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if (FpB == Mips::Val_GNU_MIPS_ABI_FP_ANY)
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return 1;
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if (FpB == Mips::Val_GNU_MIPS_ABI_FP_64A &&
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FpA == Mips::Val_GNU_MIPS_ABI_FP_64)
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return 1;
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if (FpB != Mips::Val_GNU_MIPS_ABI_FP_XX)
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return -1;
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if (FpA == Mips::Val_GNU_MIPS_ABI_FP_DOUBLE ||
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FpA == Mips::Val_GNU_MIPS_ABI_FP_64 ||
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FpA == Mips::Val_GNU_MIPS_ABI_FP_64A)
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return 1;
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return -1;
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}
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static StringRef getMipsFpAbiName(uint8_t FpAbi) {
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switch (FpAbi) {
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case Mips::Val_GNU_MIPS_ABI_FP_ANY:
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return "any";
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case Mips::Val_GNU_MIPS_ABI_FP_DOUBLE:
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return "-mdouble-float";
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case Mips::Val_GNU_MIPS_ABI_FP_SINGLE:
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return "-msingle-float";
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case Mips::Val_GNU_MIPS_ABI_FP_SOFT:
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return "-msoft-float";
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case Mips::Val_GNU_MIPS_ABI_FP_OLD_64:
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return "-mips32r2 -mfp64 (old)";
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case Mips::Val_GNU_MIPS_ABI_FP_XX:
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return "-mfpxx";
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case Mips::Val_GNU_MIPS_ABI_FP_64:
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return "-mgp32 -mfp64";
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case Mips::Val_GNU_MIPS_ABI_FP_64A:
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return "-mgp32 -mfp64 -mno-odd-spreg";
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default:
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return "unknown";
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}
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}
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uint8_t elf::getMipsFpAbiFlag(uint8_t OldFlag, uint8_t NewFlag,
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StringRef FileName) {
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if (compareMipsFpAbi(NewFlag, OldFlag) >= 0)
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return NewFlag;
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if (compareMipsFpAbi(OldFlag, NewFlag) < 0)
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error("target floating point ABI '" + getMipsFpAbiName(OldFlag) +
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"' is incompatible with '" + getMipsFpAbiName(NewFlag) + "': " +
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FileName);
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return OldFlag;
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}
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template uint32_t elf::getMipsEFlags<ELF32LE>();
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template uint32_t elf::getMipsEFlags<ELF32BE>();
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template uint32_t elf::getMipsEFlags<ELF64LE>();
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template uint32_t elf::getMipsEFlags<ELF64BE>();
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