forked from OSchip/llvm-project
390 lines
12 KiB
C++
390 lines
12 KiB
C++
//===- MipsArchTree.cpp --------------------------------------------------===//
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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 file contains a helper function for the Writer.
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//
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//===---------------------------------------------------------------------===//
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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 "lld/Common/ErrorHandler.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/Object/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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InputFile *file;
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uint32_t flags;
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};
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} // namespace
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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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assert(!files.empty() && "expected non-empty file list");
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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) {
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if (config->is64 && f.flags & EF_MIPS_MICROMIPS)
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error(toString(f.file) + ": microMIPS 64-bit is not supported");
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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(toString(f.file) + ": ABI '" + getAbiName(abi2) +
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"' is incompatible with target ABI '" + getAbiName(abi) + "'");
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bool nan2 = f.flags & EF_MIPS_NAN2008;
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if (nan != nan2)
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error(toString(f.file) + ": -mnan=" + getNanName(nan2) +
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" is incompatible with target -mnan=" + getNanName(nan));
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bool fp2 = f.flags & EF_MIPS_FP64;
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if (fp != fp2)
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error(toString(f.file) + ": -mfp" + getFpName(fp2) +
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" is incompatible with target -mfp" + getFpName(fp));
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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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warn(toString(f.file) +
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": linking non-abicalls code with abicalls code " +
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toString(files[0].file));
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if (!isPic && isPic2)
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warn(toString(f.file) +
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": linking abicalls code with non-abicalls code " +
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toString(files[0].file));
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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 newFlags, uint32_t res) {
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if (newFlags == res)
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return true;
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if (newFlags == EF_MIPS_ARCH_32 && isArchMatched(EF_MIPS_ARCH_64, res))
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return true;
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if (newFlags == 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 == newFlags)
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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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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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static std::string getFullArchName(uint32_t flags) {
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StringRef arch = getArchName(flags);
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StringRef mach = getMachName(flags);
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if (mach.empty())
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return arch.str();
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return (arch + " (" + mach + ")").str();
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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 newFlags = f.flags & (EF_MIPS_ARCH | EF_MIPS_MACH);
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// Check ISA compatibility.
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if (isArchMatched(newFlags, ret))
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continue;
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if (!isArchMatched(ret, newFlags)) {
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error("incompatible target ISA:\n>>> " + toString(files[0].file) + ": " +
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getFullArchName(ret) + "\n>>> " + toString(f.file) + ": " +
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getFullArchName(newFlags));
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return 0;
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}
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ret = newFlags;
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}
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return ret;
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}
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template <class ELFT> uint32_t elf::calcMipsEFlags() {
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std::vector<FileFlags> v;
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for (InputFile *f : objectFiles)
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v.push_back({f, cast<ObjFile<ELFT>>(f)->getObj().getHeader()->e_flags});
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if (v.empty())
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return 0;
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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 "-mgp32 -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(fileName + ": floating point ABI '" + getMipsFpAbiName(newFlag) +
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"' is incompatible with target floating point ABI '" +
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getMipsFpAbiName(oldFlag) + "'");
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return oldFlag;
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}
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template <class ELFT> static bool isN32Abi(const InputFile *f) {
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if (auto *ef = dyn_cast<ELFFileBase>(f))
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return ef->template getObj<ELFT>().getHeader()->e_flags & EF_MIPS_ABI2;
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return false;
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}
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bool elf::isMipsN32Abi(const InputFile *f) {
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switch (config->ekind) {
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case ELF32LEKind:
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return isN32Abi<ELF32LE>(f);
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case ELF32BEKind:
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return isN32Abi<ELF32BE>(f);
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case ELF64LEKind:
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return isN32Abi<ELF64LE>(f);
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case ELF64BEKind:
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return isN32Abi<ELF64BE>(f);
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default:
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llvm_unreachable("unknown Config->EKind");
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}
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}
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bool elf::isMicroMips() { return config->eflags & EF_MIPS_MICROMIPS; }
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bool elf::isMipsR6() {
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uint32_t arch = config->eflags & EF_MIPS_ARCH;
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return arch == EF_MIPS_ARCH_32R6 || arch == EF_MIPS_ARCH_64R6;
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}
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template uint32_t elf::calcMipsEFlags<ELF32LE>();
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template uint32_t elf::calcMipsEFlags<ELF32BE>();
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template uint32_t elf::calcMipsEFlags<ELF64LE>();
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template uint32_t elf::calcMipsEFlags<ELF64BE>();
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