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// aarch64-reloc-property.cc -- AArch64 relocation properties -*- C++ -*-
// Copyright (C) 2014-2020 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();
}
}
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