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91fd532eb9
Added gp_rel relocations to support addressing small section contents. Added command line to specify small section threshold in bytes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53869 91177308-0d34-0410-b5e6-96231b3b80d8
69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
//===- MipsSubtarget.cpp - Mips Subtarget Information -----------*- 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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//
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// This file implements the Mips specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#include "MipsSubtarget.h"
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#include "Mips.h"
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#include "MipsGenSubtarget.inc"
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#include "llvm/Module.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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cl::opt<bool> NotABICall("disable-mips-abicall", cl::Hidden,
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cl::desc("Disable code for SVR4-style dynamic objects"));
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cl::opt<bool> AbsoluteCall("enable-mips-absolute-call", cl::Hidden,
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cl::desc("Enable absolute call within abicall"));
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cl::opt<unsigned> SSThreshold("mips-ssection-threshold", cl::Hidden,
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cl::desc("Small data and bss section threshold size (default=8)"),
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cl::init(8));
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MipsSubtarget::MipsSubtarget(const TargetMachine &TM, const Module &M,
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const std::string &FS, bool little) :
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MipsArchVersion(Mips1), MipsABI(O32), IsLittle(little), IsSingleFloat(false),
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IsFP64bit(false), IsGP64bit(false), HasVFPU(false), HasSEInReg(false),
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HasABICall(true), HasAbsoluteCall(false), IsLinux(true)
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{
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std::string CPU = "mips1";
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// Parse features string.
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ParseSubtargetFeatures(FS, CPU);
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const std::string& TT = M.getTargetTriple();
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// Small section size threshold
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SSectionThreshold = SSThreshold;
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// Is the target system Linux ?
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if (TT.find("linux") == std::string::npos)
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IsLinux = false;
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// When only the target triple is specified and is
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// a allegrex target, set the features. We also match
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// big and little endian allegrex cores (dont really
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// know if a big one exists)
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if (TT.find("mipsallegrex") != std::string::npos) {
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MipsABI = EABI;
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IsSingleFloat = true;
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MipsArchVersion = Mips2;
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HasVFPU = true; // Enables Allegrex Vector FPU (not supported yet)
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HasSEInReg = true;
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}
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// Abicall is the default for O32 ABI and is ignored
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// for EABI.
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if (NotABICall || isABI_EABI())
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HasABICall = false;
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// TODO: disable when handling 64 bit symbols in the future.
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if (HasABICall && AbsoluteCall)
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HasAbsoluteCall = true;
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}
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