| // aarch64-reloc-property.cc -- AArch64 relocation properties -*- C++ -*- |
| |
| // Copyright (C) 2014-2021 Free Software Foundation, Inc. |
| // Written by Han Shen <shenhan@google.com> and Jing Yu <jingyu@google.com>. |
| |
| // This file is part of gold. |
| |
| // This program is free software; you can redistribute it and/or modify |
| // it under the terms of the GNU General Public License as published by |
| // the Free Software Foundation; either version 3 of the License, or |
| // (at your option) any later version. |
| |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License |
| // along with this program; if not, write to the Free Software |
| // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| // MA 02110-1301, USA. |
| |
| #include "gold.h" |
| |
| #include "aarch64-reloc-property.h" |
| #include "aarch64.h" |
| |
| #include "symtab.h" |
| |
| #include<stdio.h> |
| |
| namespace gold |
| { |
| |
| template<int L, int U> |
| bool |
| rvalue_checkup(int64_t x) |
| { |
| // We save the extra_alignment_requirement bits on [31:16] of U. |
| // "extra_alignment_requirement" could be 0, 1, 3, 7 and 15. |
| unsigned short extra_alignment_requirement = (U & 0xFFFF0000) >> 16; |
| // [15:0] of U indicates the upper bound check. |
| int64_t u = U & 0x0000FFFF; |
| if (u == 0) |
| { |
| // No requirement to check overflow. |
| gold_assert(L == 0); |
| return (x & extra_alignment_requirement) == 0; |
| } |
| |
| // Check both overflow and alignment if needed. |
| int64_t low_bound = -(L == 0 ? 0 : ((int64_t)1 << L)); |
| int64_t up_bound = ((int64_t)1 << u); |
| return ((low_bound <= x && x < up_bound) |
| && ((x & extra_alignment_requirement) == 0)); |
| } |
| |
| template<> |
| bool |
| rvalue_checkup<0, 0>(int64_t) { return true; } |
| |
| namespace |
| { |
| |
| template<int L, int U> |
| class Rvalue_bit_select_impl |
| { |
| public: |
| static uint64_t |
| calc(uint64_t x) |
| { |
| return (x & ((1ULL << (U+1)) - 1)) >> L; |
| } |
| }; |
| |
| template<int L> |
| class Rvalue_bit_select_impl<L, 63> |
| { |
| public: |
| static uint64_t |
| calc(uint64_t x) |
| { |
| return x >> L; |
| } |
| }; |
| |
| // By our convention, L=U=0 means that the whole value should be retrieved. |
| template<> |
| class Rvalue_bit_select_impl<0, 0> |
| { |
| public: |
| static uint64_t |
| calc(uint64_t x) |
| { |
| return x; |
| } |
| }; |
| |
| } // End anonymous namespace. |
| |
| template<int L, int U> |
| uint64_t |
| rvalue_bit_select(uint64_t x) |
| { |
| return Rvalue_bit_select_impl<L, U>::calc(x); |
| } |
| |
| AArch64_reloc_property::AArch64_reloc_property( |
| unsigned int code, |
| const char* name, |
| Reloc_type rtype, |
| Reloc_class rclass, |
| bool is_implemented, |
| int group_index, |
| int reference_flags, |
| Reloc_inst reloc_inst, |
| rvalue_checkup_func_p rvalue_checkup_func, |
| rvalue_bit_select_func rvalue_bit_select) |
| : code_(code), name_(name), reloc_type_(rtype), reloc_class_(rclass), |
| group_index_(group_index), |
| is_implemented_(is_implemented), |
| reference_flags_(reference_flags), |
| reloc_inst_(reloc_inst), |
| rvalue_checkup_func_(rvalue_checkup_func), |
| rvalue_bit_select_func_(rvalue_bit_select) |
| {} |
| |
| AArch64_reloc_property_table::AArch64_reloc_property_table() |
| { |
| const bool Y(true), N(false); |
| for (unsigned int i = 0; i < Property_table_size; ++i) |
| table_[i] = NULL; |
| |
| #define RL_CHECK_ALIGN2 (1 << 16) |
| #define RL_CHECK_ALIGN4 (3 << 16) |
| #define RL_CHECK_ALIGN8 (7 << 16) |
| #define RL_CHECK_ALIGN16 (15 << 16) |
| |
| #undef ARD |
| #define ARD(rname, type, class, is_implemented, group_index, LB, UB, BSL, BSH, RFLAGS, inst) \ |
| do \ |
| { \ |
| int tidx = code_to_array_index(elfcpp::R_AARCH64_##rname); \ |
| AArch64_reloc_property * p = new AArch64_reloc_property( \ |
| elfcpp::R_AARCH64_##rname, "R_AARCH64_" #rname, \ |
| AArch64_reloc_property::RT_##type, \ |
| AArch64_reloc_property::RC_##class, \ |
| is_implemented, \ |
| group_index, \ |
| (RFLAGS), \ |
| AArch64_reloc_property::INST_##inst, \ |
| rvalue_checkup<LB,UB>, \ |
| rvalue_bit_select<BSL,BSH>); \ |
| table_[tidx] = p; \ |
| } \ |
| while (0); |
| #include"aarch64-reloc.def" |
| #undef ARD |
| } |
| |
| // Return a string describing a relocation code that fails to get a |
| // relocation property in get_implemented_static_reloc_property(). |
| |
| std::string |
| AArch64_reloc_property_table::reloc_name_in_error_message(unsigned int code) |
| { |
| int tidx = code_to_array_index(code); |
| const AArch64_reloc_property* arp = this->table_[tidx]; |
| |
| if (arp == NULL) |
| { |
| char buffer[100]; |
| sprintf(buffer, _("invalid reloc %u"), code); |
| return std::string(buffer); |
| } |
| |
| // gold only implements static relocation codes. |
| AArch64_reloc_property::Reloc_type reloc_type = arp->reloc_type(); |
| gold_assert(reloc_type == AArch64_reloc_property::RT_STATIC |
| || !arp->is_implemented()); |
| |
| const char* prefix = NULL; |
| switch (reloc_type) |
| { |
| case AArch64_reloc_property::RT_STATIC: |
| prefix = arp->is_implemented() ? _("reloc ") : _("unimplemented reloc "); |
| break; |
| case AArch64_reloc_property::RT_DYNAMIC: |
| prefix = _("dynamic reloc "); |
| break; |
| default: |
| gold_unreachable(); |
| } |
| return std::string(prefix) + arp->name(); |
| } |
| |
| } |