gold/aarch64-reloc-property.cc

   1 // aarch64-reloc-property.cc -- AArch64 relocation properties   -*- C++ -*-
   2
   3 // Copyright (C) 2014-2024 Free Software Foundation, Inc.
   4 // Written by Han Shen <shenhan@google.com> and Jing Yu <jingyu@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #include "gold.h"
  24
  25 #include "aarch64-reloc-property.h"
  26 #include "aarch64.h"
  27
  28 #include "symtab.h"
  29
  30 #include<stdio.h>
  31
  32 namespace gold
  33 {
  34
  35 template<int L, int U>
  36 bool
  37 rvalue_checkup(int64_t x)
  38 {
  39   // We save the extra_alignment_requirement bits on [31:16] of U.
  40   // "extra_alignment_requirement" could be 0, 1, 3, 7 and 15.
  41   unsigned short extra_alignment_requirement = (U & 0xFFFF0000) >> 16;
  42   // [15:0] of U indicates the upper bound check.
  43   int64_t u = U & 0x0000FFFF;
  44   if (u == 0)
  45     {
  46       // No requirement to check overflow.
  47       gold_assert(L == 0);
  48       return (x & extra_alignment_requirement) == 0;
  49     }
  50
  51   // Check both overflow and alignment if needed.
  52   int64_t low_bound = -(L == 0 ? 0 : ((int64_t)1 << L));
  53   int64_t up_bound = ((int64_t)1 << u);
  54   return ((low_bound <= x && x < up_bound)
  55           && ((x & extra_alignment_requirement) == 0));
  56 }
  57
  58 template<>
  59 bool
  60 rvalue_checkup<0, 0>(int64_t) { return true; }
  61
  62 namespace
  63 {
  64
  65 template<int L, int U>
  66 class Rvalue_bit_select_impl
  67 {
  68 public:
  69   static uint64_t
  70   calc(uint64_t x)
  71   {
  72     return (x & ((1ULL << (U+1)) - 1)) >> L;
  73   }
  74 };
  75
  76 template<int L>
  77 class Rvalue_bit_select_impl<L, 63>
  78 {
  79 public:
  80   static uint64_t
  81   calc(uint64_t x)
  82   {
  83     return x >> L;
  84   }
  85 };
  86
  87 // By our convention, L=U=0 means that the whole value should be retrieved.
  88 template<>
  89 class Rvalue_bit_select_impl<0, 0>
  90 {
  91 public:
  92   static uint64_t
  93   calc(uint64_t x)
  94   {
  95     return x;
  96   }
  97 };
  98
  99 } // End anonymous namespace.
 100
 101 template<int L, int U>
 102 uint64_t
 103 rvalue_bit_select(uint64_t x)
 104 {
 105   return Rvalue_bit_select_impl<L, U>::calc(x);
 106 }
 107
 108 AArch64_reloc_property::AArch64_reloc_property(
 109     unsigned int code,
 110     const char* name,
 111     Reloc_type rtype,
 112     Reloc_class rclass,
 113     bool is_implemented,
 114     int group_index,
 115     int reference_flags,
 116     Reloc_inst reloc_inst,
 117     rvalue_checkup_func_p rvalue_checkup_func,
 118     rvalue_bit_select_func rvalue_bit_select)
 119   : code_(code), name_(name), reloc_type_(rtype), reloc_class_(rclass),
 120     group_index_(group_index),
 121     is_implemented_(is_implemented),
 122     reference_flags_(reference_flags),
 123     reloc_inst_(reloc_inst),
 124     rvalue_checkup_func_(rvalue_checkup_func),
 125     rvalue_bit_select_func_(rvalue_bit_select)
 126 {}
 127
 128 AArch64_reloc_property_table::AArch64_reloc_property_table()
 129 {
 130   const bool Y(true), N(false);
 131   for (unsigned int i = 0; i < Property_table_size; ++i)
 132     table_[i] = NULL;
 133
 134 #define RL_CHECK_ALIGN2   (1  << 16)
 135 #define RL_CHECK_ALIGN4   (3  << 16)
 136 #define RL_CHECK_ALIGN8   (7  << 16)
 137 #define RL_CHECK_ALIGN16  (15 << 16)
 138
 139 #undef ARD
 140 #define ARD(rname, type, class, is_implemented, group_index, LB, UB, BSL, BSH, RFLAGS, inst) \
 141     do \
 142       { \
 143         int tidx = code_to_array_index(elfcpp::R_AARCH64_##rname); \
 144         AArch64_reloc_property * p = new AArch64_reloc_property( \
 145           elfcpp::R_AARCH64_##rname, "R_AARCH64_" #rname, \
 146           AArch64_reloc_property::RT_##type, \
 147           AArch64_reloc_property::RC_##class, \
 148           is_implemented, \
 149           group_index, \
 150           (RFLAGS), \
 151           AArch64_reloc_property::INST_##inst,  \
 152           rvalue_checkup<LB,UB>,    \
 153           rvalue_bit_select<BSL,BSH>);          \
 154         table_[tidx] = p; \
 155       } \
 156     while (0);
 157 #include"aarch64-reloc.def"
 158 #undef ARD
 159 }
 160
 161 // Return a string describing a relocation code that fails to get a
 162 // relocation property in get_implemented_static_reloc_property().
 163
 164 std::string
 165 AArch64_reloc_property_table::reloc_name_in_error_message(unsigned int code)
 166 {
 167   int tidx = code_to_array_index(code);
 168   const AArch64_reloc_property* arp = this->table_[tidx];
 169
 170   if (arp == NULL)
 171     {
 172       char buffer[100];
 173       sprintf(buffer, _("invalid reloc %u"), code);
 174       return std::string(buffer);
 175     }
 176
 177   // gold only implements static relocation codes.
 178   AArch64_reloc_property::Reloc_type reloc_type = arp->reloc_type();
 179   gold_assert(reloc_type == AArch64_reloc_property::RT_STATIC
 180               || !arp->is_implemented());
 181
 182   const char* prefix = NULL;
 183   switch (reloc_type)
 184     {
 185     case AArch64_reloc_property::RT_STATIC:
 186       prefix = arp->is_implemented() ? _("reloc ") : _("unimplemented reloc ");
 187       break;
 188     case AArch64_reloc_property::RT_DYNAMIC:
 189       prefix = _("dynamic reloc ");
 190       break;
 191     default:
 192       gold_unreachable();
 193     }
 194   return std::string(prefix) + arp->name();
 195 }
 196
 197 }