dc49fbd2df
This patch adds the LLVM-side plumbing for the following relocations:
- R_ARM_THM_ALU_ABS_G0_NC
- R_ARM_THM_ALU_ABS_G1_NC
- R_ARM_THM_ALU_ABS_G2_NC
- R_ARM_THM_ALU_ABS_G3
(see section 5.6.1.5, Static Thumb16 relocations, of the AArch32 ELF Arm ABI:
844a79fd4c/aaelf32/aaelf32.rst (5615static-thumb16-relocations))
Which can respectivly be generated by prefixing assembly symbols with:
- :lower0_7:
- :lower8_15:
- :upper0_7:
- :upper8_15:
LLD support for these relocations will be added in a follow-up patch
Reviewed By: john.brawn, MaskRay
Differential Revision: https://reviews.llvm.org/D149443
56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
//===-- ARMMCExpr.cpp - ARM specific MC expression classes ----------------===//
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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 "ARMMCExpr.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCStreamer.h"
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using namespace llvm;
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#define DEBUG_TYPE "armmcexpr"
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const ARMMCExpr*
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ARMMCExpr::create(VariantKind Kind, const MCExpr *Expr,
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MCContext &Ctx) {
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return new (Ctx) ARMMCExpr(Kind, Expr);
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}
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void ARMMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
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switch (Kind) {
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default: llvm_unreachable("Invalid kind!");
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case VK_ARM_HI16:
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OS << ":upper16:";
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break;
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case VK_ARM_LO16:
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OS << ":lower16:";
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break;
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case VK_ARM_HI_8_15:
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OS << ":upper8_15:";
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break;
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case VK_ARM_HI_0_7:
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OS << ":upper0_7:";
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break;
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case VK_ARM_LO_8_15:
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OS << ":lower8_15:";
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break;
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case VK_ARM_LO_0_7:
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OS << ":lower0_7:";
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break;
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}
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const MCExpr *Expr = getSubExpr();
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if (Expr->getKind() != MCExpr::SymbolRef)
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OS << '(';
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Expr->print(OS, MAI);
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if (Expr->getKind() != MCExpr::SymbolRef)
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OS << ')';
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}
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void ARMMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
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Streamer.visitUsedExpr(*getSubExpr());
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}
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