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https://github.com/RPCS3/llvm-mirror.git
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d875c88104
The usual way to get a 32-bit relocation is to use a constant extender which doubles the size of the instruction, 4 bytes to 8 bytes. Another way is to put a .word32 and mix code and data within a function. The disadvantage is it's not a valid instruction encoding and jumping over it causes prefetch stalls inside the hardware. This relocation packs a 23-bit value in to an "r0 = add(rX, #a)" instruction by overwriting the source register bits. Since r0 is the return value register, if this instruction is placed after a function call which return void, r0 will be filled with an undefined value, the prefetch won't be confused, and the callee can access the constant value by way of the link register. llvm-svn: 261006
296 lines
9.7 KiB
C++
296 lines
9.7 KiB
C++
//===-- HexagonELFObjectWriter.cpp - Hexagon Target Descriptions ----------===//
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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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#include "Hexagon.h"
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#include "MCTargetDesc/HexagonFixupKinds.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#define DEBUG_TYPE "hexagon-elf-writer"
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using namespace llvm;
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using namespace Hexagon;
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namespace {
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class HexagonELFObjectWriter : public MCELFObjectTargetWriter {
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private:
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StringRef CPU;
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public:
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HexagonELFObjectWriter(uint8_t OSABI, StringRef C);
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unsigned getRelocType(MCContext &Ctx, MCValue const &Target,
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MCFixup const &Fixup, bool IsPCRel) const override;
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};
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}
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HexagonELFObjectWriter::HexagonELFObjectWriter(uint8_t OSABI, StringRef C)
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: MCELFObjectTargetWriter(/*Is64bit*/ false, OSABI, ELF::EM_HEXAGON,
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/*HasRelocationAddend*/ true),
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CPU(C) {}
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unsigned HexagonELFObjectWriter::getRelocType(MCContext &Ctx,
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MCValue const &Target,
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MCFixup const &Fixup,
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bool IsPCRel) const {
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MCSymbolRefExpr::VariantKind Variant = Target.getAccessVariant();
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switch ((unsigned)Fixup.getKind()) {
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default:
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report_fatal_error("Unrecognized relocation type");
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break;
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case FK_Data_4:
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switch(Variant) {
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case MCSymbolRefExpr::VariantKind::VK_DTPREL:
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return ELF::R_HEX_DTPREL_32;
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case MCSymbolRefExpr::VariantKind::VK_GOT:
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return ELF::R_HEX_GOT_32;
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case MCSymbolRefExpr::VariantKind::VK_GOTREL:
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return ELF::R_HEX_GOTREL_32;
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case MCSymbolRefExpr::VariantKind::VK_Hexagon_GD_GOT:
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return ELF::R_HEX_GD_GOT_32;
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case MCSymbolRefExpr::VariantKind::VK_Hexagon_IE:
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return ELF::R_HEX_IE_32;
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case MCSymbolRefExpr::VariantKind::VK_Hexagon_IE_GOT:
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return ELF::R_HEX_IE_GOT_32;
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case MCSymbolRefExpr::VariantKind::VK_Hexagon_LD_GOT:
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return ELF::R_HEX_LD_GOT_32;
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case MCSymbolRefExpr::VariantKind::VK_Hexagon_PCREL:
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return ELF::R_HEX_32_PCREL;
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case MCSymbolRefExpr::VariantKind::VK_TPREL:
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return ELF::R_HEX_TPREL_32;
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case MCSymbolRefExpr::VariantKind::VK_None:
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return IsPCRel ? ELF::R_HEX_32_PCREL : ELF::R_HEX_32;
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default:
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report_fatal_error("Unrecognized variant type");
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};
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case FK_PCRel_4:
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return ELF::R_HEX_32_PCREL;
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case FK_Data_2:
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switch(Variant) {
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case MCSymbolRefExpr::VariantKind::VK_DTPREL:
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return ELF::R_HEX_DTPREL_16;
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case MCSymbolRefExpr::VariantKind::VK_GOT:
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return ELF::R_HEX_GOT_16;
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case MCSymbolRefExpr::VariantKind::VK_Hexagon_GD_GOT:
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return ELF::R_HEX_GD_GOT_16;
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case MCSymbolRefExpr::VariantKind::VK_Hexagon_IE_GOT:
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return ELF::R_HEX_IE_GOT_16;
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case MCSymbolRefExpr::VariantKind::VK_Hexagon_LD_GOT:
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return ELF::R_HEX_LD_GOT_16;
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case MCSymbolRefExpr::VariantKind::VK_TPREL:
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return ELF::R_HEX_TPREL_16;
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case MCSymbolRefExpr::VariantKind::VK_None:
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return ELF::R_HEX_16;
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default:
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report_fatal_error("Unrecognized variant type");
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};
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case FK_Data_1:
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return ELF::R_HEX_8;
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case fixup_Hexagon_B22_PCREL:
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return ELF::R_HEX_B22_PCREL;
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case fixup_Hexagon_B15_PCREL:
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return ELF::R_HEX_B15_PCREL;
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case fixup_Hexagon_B7_PCREL:
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return ELF::R_HEX_B7_PCREL;
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case fixup_Hexagon_LO16:
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return ELF::R_HEX_LO16;
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case fixup_Hexagon_HI16:
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return ELF::R_HEX_HI16;
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case fixup_Hexagon_32:
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return ELF::R_HEX_32;
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case fixup_Hexagon_16:
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return ELF::R_HEX_16;
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case fixup_Hexagon_8:
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return ELF::R_HEX_8;
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case fixup_Hexagon_GPREL16_0:
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return ELF::R_HEX_GPREL16_0;
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case fixup_Hexagon_GPREL16_1:
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return ELF::R_HEX_GPREL16_1;
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case fixup_Hexagon_GPREL16_2:
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return ELF::R_HEX_GPREL16_2;
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case fixup_Hexagon_GPREL16_3:
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return ELF::R_HEX_GPREL16_3;
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case fixup_Hexagon_HL16:
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return ELF::R_HEX_HL16;
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case fixup_Hexagon_B13_PCREL:
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return ELF::R_HEX_B13_PCREL;
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case fixup_Hexagon_B9_PCREL:
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return ELF::R_HEX_B9_PCREL;
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case fixup_Hexagon_B32_PCREL_X:
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return ELF::R_HEX_B32_PCREL_X;
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case fixup_Hexagon_32_6_X:
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return ELF::R_HEX_32_6_X;
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case fixup_Hexagon_B22_PCREL_X:
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return ELF::R_HEX_B22_PCREL_X;
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case fixup_Hexagon_B15_PCREL_X:
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return ELF::R_HEX_B15_PCREL_X;
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case fixup_Hexagon_B13_PCREL_X:
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return ELF::R_HEX_B13_PCREL_X;
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case fixup_Hexagon_B9_PCREL_X:
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return ELF::R_HEX_B9_PCREL_X;
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case fixup_Hexagon_B7_PCREL_X:
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return ELF::R_HEX_B7_PCREL_X;
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case fixup_Hexagon_16_X:
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return ELF::R_HEX_16_X;
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case fixup_Hexagon_12_X:
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return ELF::R_HEX_12_X;
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case fixup_Hexagon_11_X:
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return ELF::R_HEX_11_X;
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case fixup_Hexagon_10_X:
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return ELF::R_HEX_10_X;
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case fixup_Hexagon_9_X:
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return ELF::R_HEX_9_X;
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case fixup_Hexagon_8_X:
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return ELF::R_HEX_8_X;
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case fixup_Hexagon_7_X:
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return ELF::R_HEX_7_X;
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case fixup_Hexagon_6_X:
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return ELF::R_HEX_6_X;
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case fixup_Hexagon_32_PCREL:
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return ELF::R_HEX_32_PCREL;
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case fixup_Hexagon_COPY:
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return ELF::R_HEX_COPY;
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case fixup_Hexagon_GLOB_DAT:
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return ELF::R_HEX_GLOB_DAT;
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case fixup_Hexagon_JMP_SLOT:
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return ELF::R_HEX_JMP_SLOT;
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case fixup_Hexagon_RELATIVE:
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return ELF::R_HEX_RELATIVE;
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case fixup_Hexagon_PLT_B22_PCREL:
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return ELF::R_HEX_PLT_B22_PCREL;
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case fixup_Hexagon_GOTREL_LO16:
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return ELF::R_HEX_GOTREL_LO16;
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case fixup_Hexagon_GOTREL_HI16:
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return ELF::R_HEX_GOTREL_HI16;
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case fixup_Hexagon_GOTREL_32:
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return ELF::R_HEX_GOTREL_32;
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case fixup_Hexagon_GOT_LO16:
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return ELF::R_HEX_GOT_LO16;
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case fixup_Hexagon_GOT_HI16:
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return ELF::R_HEX_GOT_HI16;
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case fixup_Hexagon_GOT_32:
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return ELF::R_HEX_GOT_32;
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case fixup_Hexagon_GOT_16:
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return ELF::R_HEX_GOT_16;
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case fixup_Hexagon_DTPMOD_32:
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return ELF::R_HEX_DTPMOD_32;
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case fixup_Hexagon_DTPREL_LO16:
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return ELF::R_HEX_DTPREL_LO16;
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case fixup_Hexagon_DTPREL_HI16:
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return ELF::R_HEX_DTPREL_HI16;
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case fixup_Hexagon_DTPREL_32:
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return ELF::R_HEX_DTPREL_32;
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case fixup_Hexagon_DTPREL_16:
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return ELF::R_HEX_DTPREL_16;
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case fixup_Hexagon_GD_PLT_B22_PCREL:
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return ELF::R_HEX_GD_PLT_B22_PCREL;
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case fixup_Hexagon_LD_PLT_B22_PCREL:
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return ELF::R_HEX_LD_PLT_B22_PCREL;
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case fixup_Hexagon_GD_GOT_LO16:
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return ELF::R_HEX_GD_GOT_LO16;
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case fixup_Hexagon_GD_GOT_HI16:
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return ELF::R_HEX_GD_GOT_HI16;
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case fixup_Hexagon_GD_GOT_32:
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return ELF::R_HEX_GD_GOT_32;
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case fixup_Hexagon_GD_GOT_16:
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return ELF::R_HEX_GD_GOT_16;
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case fixup_Hexagon_LD_GOT_LO16:
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return ELF::R_HEX_LD_GOT_LO16;
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case fixup_Hexagon_LD_GOT_HI16:
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return ELF::R_HEX_LD_GOT_HI16;
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case fixup_Hexagon_LD_GOT_32:
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return ELF::R_HEX_LD_GOT_32;
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case fixup_Hexagon_LD_GOT_16:
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return ELF::R_HEX_LD_GOT_16;
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case fixup_Hexagon_IE_LO16:
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return ELF::R_HEX_IE_LO16;
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case fixup_Hexagon_IE_HI16:
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return ELF::R_HEX_IE_HI16;
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case fixup_Hexagon_IE_32:
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return ELF::R_HEX_IE_32;
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case fixup_Hexagon_IE_GOT_LO16:
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return ELF::R_HEX_IE_GOT_LO16;
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case fixup_Hexagon_IE_GOT_HI16:
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return ELF::R_HEX_IE_GOT_HI16;
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case fixup_Hexagon_IE_GOT_32:
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return ELF::R_HEX_IE_GOT_32;
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case fixup_Hexagon_IE_GOT_16:
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return ELF::R_HEX_IE_GOT_16;
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case fixup_Hexagon_TPREL_LO16:
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return ELF::R_HEX_TPREL_LO16;
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case fixup_Hexagon_TPREL_HI16:
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return ELF::R_HEX_TPREL_HI16;
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case fixup_Hexagon_TPREL_32:
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return ELF::R_HEX_TPREL_32;
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case fixup_Hexagon_TPREL_16:
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return ELF::R_HEX_TPREL_16;
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case fixup_Hexagon_6_PCREL_X:
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return ELF::R_HEX_6_PCREL_X;
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case fixup_Hexagon_GOTREL_32_6_X:
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return ELF::R_HEX_GOTREL_32_6_X;
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case fixup_Hexagon_GOTREL_16_X:
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return ELF::R_HEX_GOTREL_16_X;
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case fixup_Hexagon_GOTREL_11_X:
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return ELF::R_HEX_GOTREL_11_X;
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case fixup_Hexagon_GOT_32_6_X:
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return ELF::R_HEX_GOT_32_6_X;
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case fixup_Hexagon_GOT_16_X:
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return ELF::R_HEX_GOT_16_X;
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case fixup_Hexagon_GOT_11_X:
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return ELF::R_HEX_GOT_11_X;
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case fixup_Hexagon_DTPREL_32_6_X:
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return ELF::R_HEX_DTPREL_32_6_X;
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case fixup_Hexagon_DTPREL_16_X:
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return ELF::R_HEX_DTPREL_16_X;
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case fixup_Hexagon_DTPREL_11_X:
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return ELF::R_HEX_DTPREL_11_X;
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case fixup_Hexagon_GD_GOT_32_6_X:
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return ELF::R_HEX_GD_GOT_32_6_X;
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case fixup_Hexagon_GD_GOT_16_X:
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return ELF::R_HEX_GD_GOT_16_X;
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case fixup_Hexagon_GD_GOT_11_X:
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return ELF::R_HEX_GD_GOT_11_X;
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case fixup_Hexagon_LD_GOT_32_6_X:
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return ELF::R_HEX_LD_GOT_32_6_X;
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case fixup_Hexagon_LD_GOT_16_X:
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return ELF::R_HEX_LD_GOT_16_X;
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case fixup_Hexagon_LD_GOT_11_X:
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return ELF::R_HEX_LD_GOT_11_X;
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case fixup_Hexagon_IE_32_6_X:
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return ELF::R_HEX_IE_32_6_X;
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case fixup_Hexagon_IE_16_X:
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return ELF::R_HEX_IE_16_X;
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case fixup_Hexagon_IE_GOT_32_6_X:
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return ELF::R_HEX_IE_GOT_32_6_X;
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case fixup_Hexagon_IE_GOT_16_X:
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return ELF::R_HEX_IE_GOT_16_X;
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case fixup_Hexagon_IE_GOT_11_X:
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return ELF::R_HEX_IE_GOT_11_X;
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case fixup_Hexagon_TPREL_32_6_X:
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return ELF::R_HEX_TPREL_32_6_X;
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case fixup_Hexagon_TPREL_16_X:
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return ELF::R_HEX_TPREL_16_X;
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case fixup_Hexagon_TPREL_11_X:
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return ELF::R_HEX_TPREL_11_X;
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case fixup_Hexagon_23_REG:
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return ELF::R_HEX_23_REG;
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}
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}
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MCObjectWriter *llvm::createHexagonELFObjectWriter(raw_pwrite_stream &OS,
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uint8_t OSABI,
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StringRef CPU) {
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MCELFObjectTargetWriter *MOTW = new HexagonELFObjectWriter(OSABI, CPU);
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return createELFObjectWriter(MOTW, OS, /*IsLittleEndian*/ true);
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}
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