fd5d7c5048
relocateAlloc can be called with either InputSection (including SyntheticSection like GotSection) or EhInputSection. Introduce relocateEh so that we can remove some boilerplate and replace relocateAlloc's parameter type with `InputSection`. Pull Request: https://github.com/llvm/llvm-project/pull/160031
526 lines
17 KiB
C++
526 lines
17 KiB
C++
//===- PPC.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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#include "OutputSections.h"
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#include "Symbols.h"
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#include "SyntheticSections.h"
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#include "Target.h"
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#include "Thunks.h"
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using namespace llvm;
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using namespace llvm::support::endian;
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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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// Undefine the macro predefined by GCC powerpc32.
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#undef PPC
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namespace {
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class PPC final : public TargetInfo {
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public:
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PPC(Ctx &);
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RelExpr getRelExpr(RelType type, const Symbol &s,
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const uint8_t *loc) const override;
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RelType getDynRel(RelType type) const override;
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int64_t getImplicitAddend(const uint8_t *buf, RelType type) const override;
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void writeGotHeader(uint8_t *buf) const override;
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void writePltHeader(uint8_t *buf) const override {
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llvm_unreachable("should call writePPC32GlinkSection() instead");
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}
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void writePlt(uint8_t *buf, const Symbol &sym,
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uint64_t pltEntryAddr) const override {
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llvm_unreachable("should call writePPC32GlinkSection() instead");
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}
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void writeIplt(uint8_t *buf, const Symbol &sym,
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uint64_t pltEntryAddr) const override;
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void writeGotPlt(uint8_t *buf, const Symbol &s) const override;
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bool needsThunk(RelExpr expr, RelType relocType, const InputFile *file,
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uint64_t branchAddr, const Symbol &s,
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int64_t a) const override;
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uint32_t getThunkSectionSpacing() const override;
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bool inBranchRange(RelType type, uint64_t src, uint64_t dst) const override;
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void relocate(uint8_t *loc, const Relocation &rel,
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uint64_t val) const override;
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RelExpr adjustTlsExpr(RelType type, RelExpr expr) const override;
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int getTlsGdRelaxSkip(RelType type) const override;
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void relocateAlloc(InputSection &sec, uint8_t *buf) const override;
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private:
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void relaxTlsGdToIe(uint8_t *loc, const Relocation &rel, uint64_t val) const;
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void relaxTlsGdToLe(uint8_t *loc, const Relocation &rel, uint64_t val) const;
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void relaxTlsLdToLe(uint8_t *loc, const Relocation &rel, uint64_t val) const;
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void relaxTlsIeToLe(uint8_t *loc, const Relocation &rel, uint64_t val) const;
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};
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} // namespace
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static uint16_t lo(uint32_t v) { return v; }
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static uint16_t ha(uint32_t v) { return (v + 0x8000) >> 16; }
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static uint32_t readFromHalf16(Ctx &ctx, const uint8_t *loc) {
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return read32(ctx, ctx.arg.isLE ? loc : loc - 2);
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}
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static void writeFromHalf16(Ctx &ctx, uint8_t *loc, uint32_t insn) {
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write32(ctx, ctx.arg.isLE ? loc : loc - 2, insn);
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}
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void elf::writePPC32GlinkSection(Ctx &ctx, uint8_t *buf, size_t numEntries) {
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// Create canonical PLT entries for non-PIE code. Compilers don't generate
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// non-GOT-non-PLT relocations referencing external functions for -fpie/-fPIE.
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uint32_t glink = ctx.in.plt->getVA(); // VA of .glink
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if (!ctx.arg.isPic) {
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for (const Symbol *sym :
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cast<PPC32GlinkSection>(*ctx.in.plt).canonical_plts) {
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writePPC32PltCallStub(ctx, buf, sym->getGotPltVA(ctx), nullptr, 0);
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buf += 16;
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glink += 16;
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}
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}
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// On PPC Secure PLT ABI, bl foo@plt jumps to a call stub, which loads an
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// absolute address from a specific .plt slot (usually called .got.plt on
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// other targets) and jumps there.
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//
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// a) With immediate binding (BIND_NOW), the .plt entry is resolved at load
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// time. The .glink section is not used.
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// b) With lazy binding, the .plt entry points to a `b PLTresolve`
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// instruction in .glink, filled in by PPC::writeGotPlt().
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// Write N `b PLTresolve` first.
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for (size_t i = 0; i != numEntries; ++i)
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write32(ctx, buf + 4 * i, 0x48000000 | 4 * (numEntries - i));
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buf += 4 * numEntries;
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// Then write PLTresolve(), which has two forms: PIC and non-PIC. PLTresolve()
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// computes the PLT index (by computing the distance from the landing b to
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// itself) and calls _dl_runtime_resolve() (in glibc).
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uint32_t got = ctx.in.got->getVA();
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const uint8_t *end = buf + 64;
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if (ctx.arg.isPic) {
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uint32_t afterBcl = 4 * ctx.in.plt->getNumEntries() + 12;
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uint32_t gotBcl = got + 4 - (glink + afterBcl);
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write32(ctx, buf + 0,
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0x3d6b0000 | ha(afterBcl)); // addis r11,r11,1f-glink@ha
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write32(ctx, buf + 4, 0x7c0802a6); // mflr r0
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write32(ctx, buf + 8, 0x429f0005); // bcl 20,30,.+4
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write32(ctx, buf + 12,
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0x396b0000 | lo(afterBcl)); // 1: addi r11,r11,1b-glink@l
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write32(ctx, buf + 16, 0x7d8802a6); // mflr r12
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write32(ctx, buf + 20, 0x7c0803a6); // mtlr r0
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write32(ctx, buf + 24, 0x7d6c5850); // sub r11,r11,r12
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write32(ctx, buf + 28, 0x3d8c0000 | ha(gotBcl)); // addis 12,12,GOT+4-1b@ha
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if (ha(gotBcl) == ha(gotBcl + 4)) {
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write32(ctx, buf + 32,
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0x800c0000 | lo(gotBcl)); // lwz r0,r12,GOT+4-1b@l(r12)
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write32(ctx, buf + 36,
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0x818c0000 | lo(gotBcl + 4)); // lwz r12,r12,GOT+8-1b@l(r12)
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} else {
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write32(ctx, buf + 32,
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0x840c0000 | lo(gotBcl)); // lwzu r0,r12,GOT+4-1b@l(r12)
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write32(ctx, buf + 36, 0x818c0000 | 4); // lwz r12,r12,4(r12)
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}
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write32(ctx, buf + 40, 0x7c0903a6); // mtctr 0
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write32(ctx, buf + 44, 0x7c0b5a14); // add r0,11,11
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write32(ctx, buf + 48, 0x7d605a14); // add r11,0,11
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write32(ctx, buf + 52, 0x4e800420); // bctr
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buf += 56;
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} else {
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write32(ctx, buf + 0, 0x3d800000 | ha(got + 4)); // lis r12,GOT+4@ha
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write32(ctx, buf + 4, 0x3d6b0000 | ha(-glink)); // addis r11,r11,-glink@ha
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if (ha(got + 4) == ha(got + 8))
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write32(ctx, buf + 8, 0x800c0000 | lo(got + 4)); // lwz r0,GOT+4@l(r12)
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else
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write32(ctx, buf + 8, 0x840c0000 | lo(got + 4)); // lwzu r0,GOT+4@l(r12)
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write32(ctx, buf + 12, 0x396b0000 | lo(-glink)); // addi r11,r11,-glink@l
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write32(ctx, buf + 16, 0x7c0903a6); // mtctr r0
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write32(ctx, buf + 20, 0x7c0b5a14); // add r0,r11,r11
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if (ha(got + 4) == ha(got + 8))
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write32(ctx, buf + 24, 0x818c0000 | lo(got + 8)); // lwz r12,GOT+8@l(r12)
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else
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write32(ctx, buf + 24, 0x818c0000 | 4); // lwz r12,4(r12)
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write32(ctx, buf + 28, 0x7d605a14); // add r11,r0,r11
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write32(ctx, buf + 32, 0x4e800420); // bctr
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buf += 36;
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}
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// Pad with nop. They should not be executed.
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for (; buf < end; buf += 4)
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write32(ctx, buf, 0x60000000);
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}
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PPC::PPC(Ctx &ctx) : TargetInfo(ctx) {
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copyRel = R_PPC_COPY;
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gotRel = R_PPC_GLOB_DAT;
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pltRel = R_PPC_JMP_SLOT;
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relativeRel = R_PPC_RELATIVE;
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iRelativeRel = R_PPC_IRELATIVE;
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symbolicRel = R_PPC_ADDR32;
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gotHeaderEntriesNum = 3;
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gotPltHeaderEntriesNum = 0;
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pltHeaderSize = 0;
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pltEntrySize = 4;
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ipltEntrySize = 16;
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needsThunks = true;
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tlsModuleIndexRel = R_PPC_DTPMOD32;
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tlsOffsetRel = R_PPC_DTPREL32;
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tlsGotRel = R_PPC_TPREL32;
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defaultMaxPageSize = 65536;
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defaultImageBase = 0x10000000;
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write32(ctx, trapInstr.data(), 0x7fe00008);
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}
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void PPC::writeIplt(uint8_t *buf, const Symbol &sym,
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uint64_t /*pltEntryAddr*/) const {
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// In -pie or -shared mode, assume r30 points to .got2+0x8000, and use a
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// .got2.plt_pic32. thunk.
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writePPC32PltCallStub(ctx, buf, sym.getGotPltVA(ctx), sym.file, 0x8000);
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}
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void PPC::writeGotHeader(uint8_t *buf) const {
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// _GLOBAL_OFFSET_TABLE_[0] = _DYNAMIC
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// glibc stores _dl_runtime_resolve in _GLOBAL_OFFSET_TABLE_[1],
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// link_map in _GLOBAL_OFFSET_TABLE_[2].
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write32(ctx, buf, ctx.mainPart->dynamic->getVA());
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}
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void PPC::writeGotPlt(uint8_t *buf, const Symbol &s) const {
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// Address of the symbol resolver stub in .glink .
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write32(ctx, buf,
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ctx.in.plt->getVA() + ctx.in.plt->headerSize + 4 * s.getPltIdx(ctx));
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}
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bool PPC::needsThunk(RelExpr expr, RelType type, const InputFile *file,
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uint64_t branchAddr, const Symbol &s, int64_t a) const {
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if (type != R_PPC_LOCAL24PC && type != R_PPC_REL24 && type != R_PPC_PLTREL24)
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return false;
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if (s.isInPlt(ctx))
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return true;
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if (s.isUndefWeak())
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return false;
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return !PPC::inBranchRange(type, branchAddr, s.getVA(ctx, a));
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}
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uint32_t PPC::getThunkSectionSpacing() const { return 0x2000000; }
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bool PPC::inBranchRange(RelType type, uint64_t src, uint64_t dst) const {
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uint64_t offset = dst - src;
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if (type == R_PPC_LOCAL24PC || type == R_PPC_REL24 || type == R_PPC_PLTREL24)
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return isInt<26>(offset);
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llvm_unreachable("unsupported relocation type used in branch");
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}
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RelExpr PPC::getRelExpr(RelType type, const Symbol &s,
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const uint8_t *loc) const {
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switch (type) {
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case R_PPC_NONE:
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return R_NONE;
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case R_PPC_ADDR16_HA:
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case R_PPC_ADDR16_HI:
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case R_PPC_ADDR16_LO:
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case R_PPC_ADDR24:
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case R_PPC_ADDR32:
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return R_ABS;
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case R_PPC_DTPREL16:
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case R_PPC_DTPREL16_HA:
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case R_PPC_DTPREL16_HI:
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case R_PPC_DTPREL16_LO:
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case R_PPC_DTPREL32:
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return R_DTPREL;
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case R_PPC_REL14:
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case R_PPC_REL32:
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case R_PPC_REL16_LO:
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case R_PPC_REL16_HI:
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case R_PPC_REL16_HA:
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return R_PC;
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case R_PPC_GOT16:
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return R_GOT_OFF;
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case R_PPC_LOCAL24PC:
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case R_PPC_REL24:
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return R_PLT_PC;
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case R_PPC_PLTREL24:
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return RE_PPC32_PLTREL;
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case R_PPC_GOT_TLSGD16:
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return R_TLSGD_GOT;
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case R_PPC_GOT_TLSLD16:
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return R_TLSLD_GOT;
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case R_PPC_GOT_TPREL16:
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return R_GOT_OFF;
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case R_PPC_TLS:
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return R_TLSIE_HINT;
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case R_PPC_TLSGD:
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return R_TLSDESC_CALL;
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case R_PPC_TLSLD:
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return R_TLSLD_HINT;
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case R_PPC_TPREL16:
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case R_PPC_TPREL16_HA:
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case R_PPC_TPREL16_LO:
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case R_PPC_TPREL16_HI:
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return R_TPREL;
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default:
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Err(ctx) << getErrorLoc(ctx, loc) << "unknown relocation (" << type.v
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<< ") against symbol " << &s;
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return R_NONE;
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}
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}
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RelType PPC::getDynRel(RelType type) const {
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if (type == R_PPC_ADDR32)
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return type;
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return R_PPC_NONE;
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}
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int64_t PPC::getImplicitAddend(const uint8_t *buf, RelType type) const {
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switch (type) {
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case R_PPC_NONE:
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case R_PPC_GLOB_DAT:
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case R_PPC_JMP_SLOT:
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return 0;
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case R_PPC_ADDR32:
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case R_PPC_REL32:
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case R_PPC_RELATIVE:
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case R_PPC_IRELATIVE:
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case R_PPC_DTPMOD32:
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case R_PPC_DTPREL32:
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case R_PPC_TPREL32:
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return SignExtend64<32>(read32(ctx, buf));
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default:
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InternalErr(ctx, buf) << "cannot read addend for relocation " << type;
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return 0;
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}
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}
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static std::pair<RelType, uint64_t> fromDTPREL(RelType type, uint64_t val) {
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uint64_t dtpBiasedVal = val - 0x8000;
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switch (type) {
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case R_PPC_DTPREL16:
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return {R_PPC64_ADDR16, dtpBiasedVal};
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case R_PPC_DTPREL16_HA:
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return {R_PPC_ADDR16_HA, dtpBiasedVal};
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case R_PPC_DTPREL16_HI:
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return {R_PPC_ADDR16_HI, dtpBiasedVal};
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case R_PPC_DTPREL16_LO:
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return {R_PPC_ADDR16_LO, dtpBiasedVal};
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case R_PPC_DTPREL32:
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return {R_PPC_ADDR32, dtpBiasedVal};
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default:
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return {type, val};
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}
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}
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void PPC::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
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RelType newType;
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std::tie(newType, val) = fromDTPREL(rel.type, val);
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switch (newType) {
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case R_PPC_ADDR16:
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checkIntUInt(ctx, loc, val, 16, rel);
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write16(ctx, loc, val);
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break;
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case R_PPC_GOT16:
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case R_PPC_GOT_TLSGD16:
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case R_PPC_GOT_TLSLD16:
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case R_PPC_GOT_TPREL16:
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case R_PPC_TPREL16:
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checkInt(ctx, loc, val, 16, rel);
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write16(ctx, loc, val);
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break;
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case R_PPC_ADDR16_HA:
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case R_PPC_DTPREL16_HA:
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case R_PPC_GOT_TLSGD16_HA:
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case R_PPC_GOT_TLSLD16_HA:
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case R_PPC_GOT_TPREL16_HA:
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case R_PPC_REL16_HA:
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case R_PPC_TPREL16_HA:
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write16(ctx, loc, ha(val));
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break;
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case R_PPC_ADDR16_HI:
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case R_PPC_DTPREL16_HI:
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case R_PPC_GOT_TLSGD16_HI:
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case R_PPC_GOT_TLSLD16_HI:
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case R_PPC_GOT_TPREL16_HI:
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case R_PPC_REL16_HI:
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case R_PPC_TPREL16_HI:
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write16(ctx, loc, val >> 16);
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break;
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case R_PPC_ADDR16_LO:
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case R_PPC_DTPREL16_LO:
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case R_PPC_GOT_TLSGD16_LO:
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case R_PPC_GOT_TLSLD16_LO:
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case R_PPC_GOT_TPREL16_LO:
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case R_PPC_REL16_LO:
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case R_PPC_TPREL16_LO:
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write16(ctx, loc, val);
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break;
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case R_PPC_ADDR32:
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case R_PPC_REL32:
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write32(ctx, loc, val);
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break;
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case R_PPC_REL14: {
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uint32_t mask = 0x0000FFFC;
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checkInt(ctx, loc, val, 16, rel);
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checkAlignment(ctx, loc, val, 4, rel);
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write32(ctx, loc, (read32(ctx, loc) & ~mask) | (val & mask));
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break;
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}
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case R_PPC_ADDR24:
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case R_PPC_REL24:
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case R_PPC_LOCAL24PC:
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case R_PPC_PLTREL24: {
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uint32_t mask = 0x03FFFFFC;
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checkInt(ctx, loc, val, 26, rel);
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checkAlignment(ctx, loc, val, 4, rel);
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write32(ctx, loc, (read32(ctx, loc) & ~mask) | (val & mask));
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break;
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}
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default:
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llvm_unreachable("unknown relocation");
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}
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}
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RelExpr PPC::adjustTlsExpr(RelType type, RelExpr expr) const {
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if (expr == R_RELAX_TLS_GD_TO_IE)
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return R_RELAX_TLS_GD_TO_IE_GOT_OFF;
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if (expr == R_RELAX_TLS_LD_TO_LE)
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return R_RELAX_TLS_LD_TO_LE_ABS;
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return expr;
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}
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int PPC::getTlsGdRelaxSkip(RelType type) const {
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// A __tls_get_addr call instruction is marked with 2 relocations:
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//
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// R_PPC_TLSGD / R_PPC_TLSLD: marker relocation
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// R_PPC_REL24: __tls_get_addr
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//
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// After the relaxation we no longer call __tls_get_addr and should skip both
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// relocations to not create a false dependence on __tls_get_addr being
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// defined.
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if (type == R_PPC_TLSGD || type == R_PPC_TLSLD)
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return 2;
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return 1;
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}
|
|
|
|
void PPC::relaxTlsGdToIe(uint8_t *loc, const Relocation &rel,
|
|
uint64_t val) const {
|
|
switch (rel.type) {
|
|
case R_PPC_GOT_TLSGD16: {
|
|
// addi rT, rA, x@got@tlsgd --> lwz rT, x@got@tprel(rA)
|
|
uint32_t insn = readFromHalf16(ctx, loc);
|
|
writeFromHalf16(ctx, loc, 0x80000000 | (insn & 0x03ff0000));
|
|
relocateNoSym(loc, R_PPC_GOT_TPREL16, val);
|
|
break;
|
|
}
|
|
case R_PPC_TLSGD:
|
|
// bl __tls_get_addr(x@tldgd) --> add r3, r3, r2
|
|
write32(ctx, loc, 0x7c631214);
|
|
break;
|
|
default:
|
|
llvm_unreachable("unsupported relocation for TLS GD to IE relaxation");
|
|
}
|
|
}
|
|
|
|
void PPC::relaxTlsGdToLe(uint8_t *loc, const Relocation &rel,
|
|
uint64_t val) const {
|
|
switch (rel.type) {
|
|
case R_PPC_GOT_TLSGD16:
|
|
// addi r3, r31, x@got@tlsgd --> addis r3, r2, x@tprel@ha
|
|
writeFromHalf16(ctx, loc, 0x3c620000 | ha(val));
|
|
break;
|
|
case R_PPC_TLSGD:
|
|
// bl __tls_get_addr(x@tldgd) --> add r3, r3, x@tprel@l
|
|
write32(ctx, loc, 0x38630000 | lo(val));
|
|
break;
|
|
default:
|
|
llvm_unreachable("unsupported relocation for TLS GD to LE relaxation");
|
|
}
|
|
}
|
|
|
|
void PPC::relaxTlsLdToLe(uint8_t *loc, const Relocation &rel,
|
|
uint64_t val) const {
|
|
switch (rel.type) {
|
|
case R_PPC_GOT_TLSLD16:
|
|
// addi r3, rA, x@got@tlsgd --> addis r3, r2, 0
|
|
writeFromHalf16(ctx, loc, 0x3c620000);
|
|
break;
|
|
case R_PPC_TLSLD:
|
|
// r3+x@dtprel computes r3+x-0x8000, while we want it to compute r3+x@tprel
|
|
// = r3+x-0x7000, so add 4096 to r3.
|
|
// bl __tls_get_addr(x@tlsld) --> addi r3, r3, 4096
|
|
write32(ctx, loc, 0x38631000);
|
|
break;
|
|
case R_PPC_DTPREL16:
|
|
case R_PPC_DTPREL16_HA:
|
|
case R_PPC_DTPREL16_HI:
|
|
case R_PPC_DTPREL16_LO:
|
|
relocate(loc, rel, val);
|
|
break;
|
|
default:
|
|
llvm_unreachable("unsupported relocation for TLS LD to LE relaxation");
|
|
}
|
|
}
|
|
|
|
void PPC::relaxTlsIeToLe(uint8_t *loc, const Relocation &rel,
|
|
uint64_t val) const {
|
|
switch (rel.type) {
|
|
case R_PPC_GOT_TPREL16: {
|
|
// lwz rT, x@got@tprel(rA) --> addis rT, r2, x@tprel@ha
|
|
uint32_t rt = readFromHalf16(ctx, loc) & 0x03e00000;
|
|
writeFromHalf16(ctx, loc, 0x3c020000 | rt | ha(val));
|
|
break;
|
|
}
|
|
case R_PPC_TLS: {
|
|
uint32_t insn = read32(ctx, loc);
|
|
if (insn >> 26 != 31)
|
|
ErrAlways(ctx) << "unrecognized instruction for IE to LE R_PPC_TLS";
|
|
// addi rT, rT, x@tls --> addi rT, rT, x@tprel@l
|
|
unsigned secondaryOp = (read32(ctx, loc) & 0x000007fe) >> 1;
|
|
uint32_t dFormOp = getPPCDFormOp(secondaryOp);
|
|
if (dFormOp == 0) { // Expecting a DS-Form instruction.
|
|
dFormOp = getPPCDSFormOp(secondaryOp);
|
|
if (dFormOp == 0)
|
|
ErrAlways(ctx) << "unrecognized instruction for IE to LE R_PPC_TLS";
|
|
}
|
|
write32(ctx, loc, (dFormOp | (insn & 0x03ff0000) | lo(val)));
|
|
break;
|
|
}
|
|
default:
|
|
llvm_unreachable("unsupported relocation for TLS IE to LE relaxation");
|
|
}
|
|
}
|
|
|
|
void PPC::relocateAlloc(InputSection &sec, uint8_t *buf) const {
|
|
uint64_t secAddr = sec.getOutputSection()->addr + sec.outSecOff;
|
|
for (const Relocation &rel : sec.relocs()) {
|
|
uint8_t *loc = buf + rel.offset;
|
|
const uint64_t val =
|
|
SignExtend64(sec.getRelocTargetVA(ctx, rel, secAddr + rel.offset), 32);
|
|
switch (rel.expr) {
|
|
case R_RELAX_TLS_GD_TO_IE_GOT_OFF:
|
|
relaxTlsGdToIe(loc, rel, val);
|
|
break;
|
|
case R_RELAX_TLS_GD_TO_LE:
|
|
relaxTlsGdToLe(loc, rel, val);
|
|
break;
|
|
case R_RELAX_TLS_LD_TO_LE_ABS:
|
|
relaxTlsLdToLe(loc, rel, val);
|
|
break;
|
|
case R_RELAX_TLS_IE_TO_LE:
|
|
relaxTlsIeToLe(loc, rel, val);
|
|
break;
|
|
default:
|
|
relocate(loc, rel, val);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void elf::setPPCTargetInfo(Ctx &ctx) { ctx.target.reset(new PPC(ctx)); }
|