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