diff options
Diffstat (limited to 'src/DwarfInstructions.hpp')
| -rw-r--r-- | src/DwarfInstructions.hpp | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/src/DwarfInstructions.hpp b/src/DwarfInstructions.hpp index ec70c0a11f70..29a070fa3e04 100644 --- a/src/DwarfInstructions.hpp +++ b/src/DwarfInstructions.hpp @@ -1,9 +1,8 @@ //===-------------------------- DwarfInstructions.hpp ---------------------===// // -// The LLVM Compiler Infrastructure -// -// This file is dual licensed under the MIT and the University of Illinois Open -// Source Licenses. See LICENSE.TXT for details. +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // // // Processor specific interpretation of DWARF unwind info. @@ -82,12 +81,11 @@ typename A::pint_t DwarfInstructions<A, R>::getSavedRegister( const RegisterLocation &savedReg) { switch (savedReg.location) { case CFI_Parser<A>::kRegisterInCFA: - return addressSpace.getRegister(cfa + (pint_t)savedReg.value); + return (pint_t)addressSpace.getRegister(cfa + (pint_t)savedReg.value); case CFI_Parser<A>::kRegisterAtExpression: - return addressSpace.getRegister( - evaluateExpression((pint_t)savedReg.value, addressSpace, - registers, cfa)); + return (pint_t)addressSpace.getRegister(evaluateExpression( + (pint_t)savedReg.value, addressSpace, registers, cfa)); case CFI_Parser<A>::kRegisterIsExpression: return evaluateExpression((pint_t)savedReg.value, addressSpace, @@ -234,6 +232,31 @@ int DwarfInstructions<A, R>::stepWithDwarf(A &addressSpace, pint_t pc, } #endif +#if defined(_LIBUNWIND_TARGET_PPC64) +#define PPC64_ELFV1_R2_LOAD_INST_ENCODING 0xe8410028u // ld r2,40(r1) +#define PPC64_ELFV1_R2_OFFSET 40 +#define PPC64_ELFV2_R2_LOAD_INST_ENCODING 0xe8410018u // ld r2,24(r1) +#define PPC64_ELFV2_R2_OFFSET 24 + // If the instruction at return address is a TOC (r2) restore, + // then r2 was saved and needs to be restored. + // ELFv2 ABI specifies that the TOC Pointer must be saved at SP + 24, + // while in ELFv1 ABI it is saved at SP + 40. + if (R::getArch() == REGISTERS_PPC64 && returnAddress != 0) { + pint_t sp = newRegisters.getRegister(UNW_REG_SP); + pint_t r2 = 0; + switch (addressSpace.get32(returnAddress)) { + case PPC64_ELFV1_R2_LOAD_INST_ENCODING: + r2 = addressSpace.get64(sp + PPC64_ELFV1_R2_OFFSET); + break; + case PPC64_ELFV2_R2_LOAD_INST_ENCODING: + r2 = addressSpace.get64(sp + PPC64_ELFV2_R2_OFFSET); + break; + } + if (r2) + newRegisters.setRegister(UNW_PPC64_R2, r2); + } +#endif + // Return address is address after call site instruction, so setting IP to // that does simualates a return. newRegisters.setIP(returnAddress); |