1145 lines
29 KiB
C++
1145 lines
29 KiB
C++
// expression.cc -- expressions in linker scripts for gold
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// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#include "gold.h"
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#include <string>
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#include "elfcpp.h"
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#include "parameters.h"
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#include "symtab.h"
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#include "layout.h"
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#include "output.h"
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#include "script.h"
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#include "script-c.h"
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namespace gold
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{
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// This file holds the code which handles linker expressions.
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// The dot symbol, which linker scripts refer to simply as ".",
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// requires special treatment. The dot symbol is set several times,
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// section addresses will refer to it, output sections will change it,
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// and it can be set based on the value of other symbols. We simplify
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// the handling by prohibiting setting the dot symbol to the value of
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// a non-absolute symbol.
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// When evaluating the value of an expression, we pass in a pointer to
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// this struct, so that the expression evaluation can find the
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// information it needs.
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struct Expression::Expression_eval_info
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{
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// The symbol table.
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const Symbol_table* symtab;
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// The layout--we use this to get section information.
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const Layout* layout;
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// Whether to check assertions.
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bool check_assertions;
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// Whether expressions can refer to the dot symbol. The dot symbol
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// is only available within a SECTIONS clause.
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bool is_dot_available;
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// The current value of the dot symbol.
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uint64_t dot_value;
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// The section in which the dot symbol is defined; this is NULL if
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// it is absolute.
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Output_section* dot_section;
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// Points to where the section of the result should be stored.
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Output_section** result_section_pointer;
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};
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// Evaluate an expression.
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uint64_t
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Expression::eval(const Symbol_table* symtab, const Layout* layout,
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bool check_assertions)
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{
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Output_section* dummy;
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return this->eval_maybe_dot(symtab, layout, check_assertions,
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false, 0, NULL, &dummy);
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}
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// Evaluate an expression which may refer to the dot symbol.
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uint64_t
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Expression::eval_with_dot(const Symbol_table* symtab, const Layout* layout,
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bool check_assertions, uint64_t dot_value,
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Output_section* dot_section,
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Output_section** result_section_pointer)
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{
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return this->eval_maybe_dot(symtab, layout, check_assertions, true,
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dot_value, dot_section, result_section_pointer);
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}
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// Evaluate an expression which may or may not refer to the dot
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// symbol.
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uint64_t
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Expression::eval_maybe_dot(const Symbol_table* symtab, const Layout* layout,
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bool check_assertions, bool is_dot_available,
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uint64_t dot_value, Output_section* dot_section,
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Output_section** result_section_pointer)
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{
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Expression_eval_info eei;
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eei.symtab = symtab;
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eei.layout = layout;
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eei.check_assertions = check_assertions;
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eei.is_dot_available = is_dot_available;
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eei.dot_value = dot_value;
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eei.dot_section = dot_section;
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// We assume the value is absolute, and only set this to a section
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// if we find a section relative reference.
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*result_section_pointer = NULL;
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eei.result_section_pointer = result_section_pointer;
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return this->value(&eei);
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}
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// A number.
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class Integer_expression : public Expression
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{
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public:
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Integer_expression(uint64_t val)
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: val_(val)
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{ }
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uint64_t
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value(const Expression_eval_info*)
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{ return this->val_; }
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void
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print(FILE* f) const
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{ fprintf(f, "0x%llx", static_cast<unsigned long long>(this->val_)); }
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private:
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uint64_t val_;
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};
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extern "C" Expression*
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script_exp_integer(uint64_t val)
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{
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return new Integer_expression(val);
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}
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// An expression whose value is the value of a symbol.
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class Symbol_expression : public Expression
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{
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public:
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Symbol_expression(const char* name, size_t length)
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: name_(name, length)
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{ }
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uint64_t
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value(const Expression_eval_info*);
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void
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print(FILE* f) const
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{ fprintf(f, "%s", this->name_.c_str()); }
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private:
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std::string name_;
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};
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uint64_t
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Symbol_expression::value(const Expression_eval_info* eei)
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{
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Symbol* sym = eei->symtab->lookup(this->name_.c_str());
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if (sym == NULL || !sym->is_defined())
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{
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gold_error(_("undefined symbol '%s' referenced in expression"),
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this->name_.c_str());
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return 0;
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}
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*eei->result_section_pointer = sym->output_section();
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if (parameters->target().get_size() == 32)
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return eei->symtab->get_sized_symbol<32>(sym)->value();
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else if (parameters->target().get_size() == 64)
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return eei->symtab->get_sized_symbol<64>(sym)->value();
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else
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gold_unreachable();
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}
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// An expression whose value is the value of the special symbol ".".
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// This is only valid within a SECTIONS clause.
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class Dot_expression : public Expression
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{
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public:
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Dot_expression()
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{ }
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uint64_t
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value(const Expression_eval_info*);
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void
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print(FILE* f) const
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{ fprintf(f, "."); }
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};
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uint64_t
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Dot_expression::value(const Expression_eval_info* eei)
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{
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if (!eei->is_dot_available)
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{
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gold_error(_("invalid reference to dot symbol outside of "
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"SECTIONS clause"));
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return 0;
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}
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*eei->result_section_pointer = eei->dot_section;
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return eei->dot_value;
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}
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// A string. This is either the name of a symbol, or ".".
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extern "C" Expression*
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script_exp_string(const char* name, size_t length)
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{
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if (length == 1 && name[0] == '.')
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return new Dot_expression();
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else
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return new Symbol_expression(name, length);
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}
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// A unary expression.
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class Unary_expression : public Expression
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{
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public:
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Unary_expression(Expression* arg)
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: arg_(arg)
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{ }
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~Unary_expression()
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{ delete this->arg_; }
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protected:
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uint64_t
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arg_value(const Expression_eval_info* eei,
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Output_section** arg_section_pointer) const
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{
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return this->arg_->eval_maybe_dot(eei->symtab, eei->layout,
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eei->check_assertions,
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eei->is_dot_available,
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eei->dot_value,
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eei->dot_section,
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arg_section_pointer);
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}
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void
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arg_print(FILE* f) const
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{ this->arg_->print(f); }
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private:
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Expression* arg_;
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};
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// Handle unary operators. We use a preprocessor macro as a hack to
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// capture the C operator.
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#define UNARY_EXPRESSION(NAME, OPERATOR) \
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class Unary_ ## NAME : public Unary_expression \
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{ \
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public: \
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Unary_ ## NAME(Expression* arg) \
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: Unary_expression(arg) \
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{ } \
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\
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uint64_t \
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value(const Expression_eval_info* eei) \
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{ \
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Output_section* arg_section; \
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uint64_t ret = OPERATOR this->arg_value(eei, &arg_section); \
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if (arg_section != NULL && parameters->options().relocatable()) \
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gold_warning(_("unary " #NAME " applied to section " \
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"relative value")); \
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return ret; \
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} \
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\
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void \
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print(FILE* f) const \
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{ \
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fprintf(f, "(%s ", #OPERATOR); \
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this->arg_print(f); \
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fprintf(f, ")"); \
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} \
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}; \
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\
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extern "C" Expression* \
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script_exp_unary_ ## NAME(Expression* arg) \
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{ \
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return new Unary_ ## NAME(arg); \
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}
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UNARY_EXPRESSION(minus, -)
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UNARY_EXPRESSION(logical_not, !)
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UNARY_EXPRESSION(bitwise_not, ~)
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// A binary expression.
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class Binary_expression : public Expression
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{
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public:
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Binary_expression(Expression* left, Expression* right)
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: left_(left), right_(right)
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{ }
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~Binary_expression()
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{
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delete this->left_;
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delete this->right_;
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}
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protected:
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uint64_t
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left_value(const Expression_eval_info* eei,
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Output_section** section_pointer) const
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{
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return this->left_->eval_maybe_dot(eei->symtab, eei->layout,
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eei->check_assertions,
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eei->is_dot_available,
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eei->dot_value,
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eei->dot_section,
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section_pointer);
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}
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uint64_t
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right_value(const Expression_eval_info* eei,
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Output_section** section_pointer) const
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{
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return this->right_->eval_maybe_dot(eei->symtab, eei->layout,
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eei->check_assertions,
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eei->is_dot_available,
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eei->dot_value,
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eei->dot_section,
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section_pointer);
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}
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void
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left_print(FILE* f) const
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{ this->left_->print(f); }
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void
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right_print(FILE* f) const
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{ this->right_->print(f); }
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// This is a call to function FUNCTION_NAME. Print it. This is for
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// debugging.
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void
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print_function(FILE* f, const char *function_name) const
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{
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fprintf(f, "%s(", function_name);
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this->left_print(f);
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fprintf(f, ", ");
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this->right_print(f);
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fprintf(f, ")");
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}
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private:
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Expression* left_;
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Expression* right_;
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};
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// Handle binary operators. We use a preprocessor macro as a hack to
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// capture the C operator. KEEP_LEFT means that if the left operand
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// is section relative and the right operand is not, the result uses
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// the same section as the left operand. KEEP_RIGHT is the same with
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// left and right swapped. IS_DIV means that we need to give an error
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// if the right operand is zero. WARN means that we should warn if
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// used on section relative values in a relocatable link. We always
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// warn if used on values in different sections in a relocatable link.
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#define BINARY_EXPRESSION(NAME, OPERATOR, KEEP_LEFT, KEEP_RIGHT, IS_DIV, WARN) \
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class Binary_ ## NAME : public Binary_expression \
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{ \
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public: \
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Binary_ ## NAME(Expression* left, Expression* right) \
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: Binary_expression(left, right) \
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{ } \
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\
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uint64_t \
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value(const Expression_eval_info* eei) \
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{ \
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Output_section* left_section; \
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uint64_t left = this->left_value(eei, &left_section); \
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Output_section* right_section; \
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uint64_t right = this->right_value(eei, &right_section); \
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if (KEEP_RIGHT && left_section == NULL && right_section != NULL) \
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*eei->result_section_pointer = right_section; \
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else if (KEEP_LEFT \
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&& left_section != NULL \
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&& right_section == NULL) \
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*eei->result_section_pointer = left_section; \
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else if ((WARN || left_section != right_section) \
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&& (left_section != NULL || right_section != NULL) \
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&& parameters->options().relocatable()) \
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gold_warning(_("binary " #NAME " applied to section " \
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"relative value")); \
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if (IS_DIV && right == 0) \
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{ \
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gold_error(_(#NAME " by zero")); \
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return 0; \
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} \
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return left OPERATOR right; \
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} \
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\
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void \
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print(FILE* f) const \
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{ \
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fprintf(f, "("); \
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this->left_print(f); \
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fprintf(f, " %s ", #OPERATOR); \
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this->right_print(f); \
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fprintf(f, ")"); \
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} \
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}; \
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\
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extern "C" Expression* \
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script_exp_binary_ ## NAME(Expression* left, Expression* right) \
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{ \
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return new Binary_ ## NAME(left, right); \
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}
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BINARY_EXPRESSION(mult, *, false, false, false, true)
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BINARY_EXPRESSION(div, /, false, false, true, true)
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BINARY_EXPRESSION(mod, %, false, false, true, true)
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BINARY_EXPRESSION(add, +, true, true, false, true)
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BINARY_EXPRESSION(sub, -, true, false, false, false)
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BINARY_EXPRESSION(lshift, <<, false, false, false, true)
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BINARY_EXPRESSION(rshift, >>, false, false, false, true)
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BINARY_EXPRESSION(eq, ==, false, false, false, false)
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BINARY_EXPRESSION(ne, !=, false, false, false, false)
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BINARY_EXPRESSION(le, <=, false, false, false, false)
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BINARY_EXPRESSION(ge, >=, false, false, false, false)
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BINARY_EXPRESSION(lt, <, false, false, false, false)
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BINARY_EXPRESSION(gt, >, false, false, false, false)
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BINARY_EXPRESSION(bitwise_and, &, true, true, false, true)
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BINARY_EXPRESSION(bitwise_xor, ^, true, true, false, true)
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BINARY_EXPRESSION(bitwise_or, |, true, true, false, true)
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BINARY_EXPRESSION(logical_and, &&, false, false, false, true)
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BINARY_EXPRESSION(logical_or, ||, false, false, false, true)
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// A trinary expression.
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class Trinary_expression : public Expression
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{
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public:
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Trinary_expression(Expression* arg1, Expression* arg2, Expression* arg3)
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: arg1_(arg1), arg2_(arg2), arg3_(arg3)
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{ }
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~Trinary_expression()
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{
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delete this->arg1_;
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delete this->arg2_;
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delete this->arg3_;
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}
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protected:
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uint64_t
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arg1_value(const Expression_eval_info* eei,
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Output_section** section_pointer) const
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{
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return this->arg1_->eval_maybe_dot(eei->symtab, eei->layout,
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eei->check_assertions,
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eei->is_dot_available,
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eei->dot_value,
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eei->dot_section,
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section_pointer);
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}
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uint64_t
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arg2_value(const Expression_eval_info* eei,
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Output_section** section_pointer) const
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{
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return this->arg1_->eval_maybe_dot(eei->symtab, eei->layout,
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eei->check_assertions,
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eei->is_dot_available,
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eei->dot_value,
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eei->dot_section,
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section_pointer);
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}
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uint64_t
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arg3_value(const Expression_eval_info* eei,
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Output_section** section_pointer) const
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{
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return this->arg1_->eval_maybe_dot(eei->symtab, eei->layout,
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eei->check_assertions,
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eei->is_dot_available,
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eei->dot_value,
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eei->dot_section,
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section_pointer);
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}
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void
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arg1_print(FILE* f) const
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{ this->arg1_->print(f); }
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void
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arg2_print(FILE* f) const
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{ this->arg2_->print(f); }
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void
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arg3_print(FILE* f) const
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{ this->arg3_->print(f); }
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private:
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Expression* arg1_;
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Expression* arg2_;
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Expression* arg3_;
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};
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// The conditional operator.
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class Trinary_cond : public Trinary_expression
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{
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public:
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Trinary_cond(Expression* arg1, Expression* arg2, Expression* arg3)
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: Trinary_expression(arg1, arg2, arg3)
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{ }
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uint64_t
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value(const Expression_eval_info* eei)
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{
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Output_section* arg1_section;
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uint64_t arg1 = this->arg1_value(eei, &arg1_section);
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return (arg1
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? this->arg2_value(eei, eei->result_section_pointer)
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: this->arg3_value(eei, eei->result_section_pointer));
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}
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void
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print(FILE* f) const
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{
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fprintf(f, "(");
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this->arg1_print(f);
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fprintf(f, " ? ");
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this->arg2_print(f);
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fprintf(f, " : ");
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this->arg3_print(f);
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fprintf(f, ")");
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}
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};
|
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|
|
extern "C" Expression*
|
|
script_exp_trinary_cond(Expression* arg1, Expression* arg2, Expression* arg3)
|
|
{
|
|
return new Trinary_cond(arg1, arg2, arg3);
|
|
}
|
|
|
|
// Max function.
|
|
|
|
class Max_expression : public Binary_expression
|
|
{
|
|
public:
|
|
Max_expression(Expression* left, Expression* right)
|
|
: Binary_expression(left, right)
|
|
{ }
|
|
|
|
uint64_t
|
|
value(const Expression_eval_info* eei)
|
|
{
|
|
Output_section* left_section;
|
|
uint64_t left = this->left_value(eei, &left_section);
|
|
Output_section* right_section;
|
|
uint64_t right = this->right_value(eei, &right_section);
|
|
if (left_section == right_section)
|
|
*eei->result_section_pointer = left_section;
|
|
else if ((left_section != NULL || right_section != NULL)
|
|
&& parameters->options().relocatable())
|
|
gold_warning(_("max applied to section relative value"));
|
|
return std::max(left, right);
|
|
}
|
|
|
|
void
|
|
print(FILE* f) const
|
|
{ this->print_function(f, "MAX"); }
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_max(Expression* left, Expression* right)
|
|
{
|
|
return new Max_expression(left, right);
|
|
}
|
|
|
|
// Min function.
|
|
|
|
class Min_expression : public Binary_expression
|
|
{
|
|
public:
|
|
Min_expression(Expression* left, Expression* right)
|
|
: Binary_expression(left, right)
|
|
{ }
|
|
|
|
uint64_t
|
|
value(const Expression_eval_info* eei)
|
|
{
|
|
Output_section* left_section;
|
|
uint64_t left = this->left_value(eei, &left_section);
|
|
Output_section* right_section;
|
|
uint64_t right = this->right_value(eei, &right_section);
|
|
if (left_section == right_section)
|
|
*eei->result_section_pointer = left_section;
|
|
else if ((left_section != NULL || right_section != NULL)
|
|
&& parameters->options().relocatable())
|
|
gold_warning(_("min applied to section relative value"));
|
|
return std::min(left, right);
|
|
}
|
|
|
|
void
|
|
print(FILE* f) const
|
|
{ this->print_function(f, "MIN"); }
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_min(Expression* left, Expression* right)
|
|
{
|
|
return new Min_expression(left, right);
|
|
}
|
|
|
|
// Class Section_expression. This is a parent class used for
|
|
// functions which take the name of an output section.
|
|
|
|
class Section_expression : public Expression
|
|
{
|
|
public:
|
|
Section_expression(const char* section_name, size_t section_name_len)
|
|
: section_name_(section_name, section_name_len)
|
|
{ }
|
|
|
|
uint64_t
|
|
value(const Expression_eval_info*);
|
|
|
|
void
|
|
print(FILE* f) const
|
|
{ fprintf(f, "%s(%s)", this->function_name(), this->section_name_.c_str()); }
|
|
|
|
protected:
|
|
// The child class must implement this.
|
|
virtual uint64_t
|
|
value_from_output_section(const Expression_eval_info*,
|
|
Output_section*) = 0;
|
|
|
|
// The child class must implement this.
|
|
virtual uint64_t
|
|
value_from_script_output_section(uint64_t address, uint64_t load_address,
|
|
uint64_t addralign, uint64_t size) = 0;
|
|
|
|
// The child class must implement this.
|
|
virtual const char*
|
|
function_name() const = 0;
|
|
|
|
private:
|
|
std::string section_name_;
|
|
};
|
|
|
|
uint64_t
|
|
Section_expression::value(const Expression_eval_info* eei)
|
|
{
|
|
const char* section_name = this->section_name_.c_str();
|
|
Output_section* os = eei->layout->find_output_section(section_name);
|
|
if (os != NULL)
|
|
return this->value_from_output_section(eei, os);
|
|
|
|
uint64_t address;
|
|
uint64_t load_address;
|
|
uint64_t addralign;
|
|
uint64_t size;
|
|
const Script_options* ss = eei->layout->script_options();
|
|
if (ss->saw_sections_clause())
|
|
{
|
|
if (ss->script_sections()->get_output_section_info(section_name,
|
|
&address,
|
|
&load_address,
|
|
&addralign,
|
|
&size))
|
|
return this->value_from_script_output_section(address, load_address,
|
|
addralign, size);
|
|
}
|
|
|
|
gold_error("%s called on nonexistent output section '%s'",
|
|
this->function_name(), section_name);
|
|
return 0;
|
|
}
|
|
|
|
// ABSOLUTE function.
|
|
|
|
class Absolute_expression : public Unary_expression
|
|
{
|
|
public:
|
|
Absolute_expression(Expression* arg)
|
|
: Unary_expression(arg)
|
|
{ }
|
|
|
|
uint64_t
|
|
value(const Expression_eval_info* eei)
|
|
{
|
|
Output_section* dummy;
|
|
uint64_t ret = this->arg_value(eei, &dummy);
|
|
// Force the value to be absolute.
|
|
*eei->result_section_pointer = NULL;
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
print(FILE* f) const
|
|
{
|
|
fprintf(f, "ABSOLUTE(");
|
|
this->arg_print(f);
|
|
fprintf(f, ")");
|
|
}
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_absolute(Expression* arg)
|
|
{
|
|
return new Absolute_expression(arg);
|
|
}
|
|
|
|
// ALIGN function.
|
|
|
|
class Align_expression : public Binary_expression
|
|
{
|
|
public:
|
|
Align_expression(Expression* left, Expression* right)
|
|
: Binary_expression(left, right)
|
|
{ }
|
|
|
|
uint64_t
|
|
value(const Expression_eval_info* eei)
|
|
{
|
|
Output_section* align_section;
|
|
uint64_t align = this->right_value(eei, &align_section);
|
|
if (align_section != NULL
|
|
&& parameters->options().relocatable())
|
|
gold_warning(_("aligning to section relative value"));
|
|
|
|
uint64_t value = this->left_value(eei, eei->result_section_pointer);
|
|
if (align <= 1)
|
|
return value;
|
|
return ((value + align - 1) / align) * align;
|
|
}
|
|
|
|
void
|
|
print(FILE* f) const
|
|
{ this->print_function(f, "ALIGN"); }
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_align(Expression* left, Expression* right)
|
|
{
|
|
return new Align_expression(left, right);
|
|
}
|
|
|
|
// ASSERT function.
|
|
|
|
class Assert_expression : public Unary_expression
|
|
{
|
|
public:
|
|
Assert_expression(Expression* arg, const char* message, size_t length)
|
|
: Unary_expression(arg), message_(message, length)
|
|
{ }
|
|
|
|
uint64_t
|
|
value(const Expression_eval_info* eei)
|
|
{
|
|
uint64_t value = this->arg_value(eei, eei->result_section_pointer);
|
|
if (!value && eei->check_assertions)
|
|
gold_error("%s", this->message_.c_str());
|
|
return value;
|
|
}
|
|
|
|
void
|
|
print(FILE* f) const
|
|
{
|
|
fprintf(f, "ASSERT(");
|
|
this->arg_print(f);
|
|
fprintf(f, ", %s)", this->message_.c_str());
|
|
}
|
|
|
|
private:
|
|
std::string message_;
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_assert(Expression* expr, const char* message,
|
|
size_t length)
|
|
{
|
|
return new Assert_expression(expr, message, length);
|
|
}
|
|
|
|
// ADDR function.
|
|
|
|
class Addr_expression : public Section_expression
|
|
{
|
|
public:
|
|
Addr_expression(const char* section_name, size_t section_name_len)
|
|
: Section_expression(section_name, section_name_len)
|
|
{ }
|
|
|
|
protected:
|
|
uint64_t
|
|
value_from_output_section(const Expression_eval_info* eei,
|
|
Output_section* os)
|
|
{
|
|
*eei->result_section_pointer = os;
|
|
return os->address();
|
|
}
|
|
|
|
uint64_t
|
|
value_from_script_output_section(uint64_t address, uint64_t, uint64_t,
|
|
uint64_t)
|
|
{ return address; }
|
|
|
|
const char*
|
|
function_name() const
|
|
{ return "ADDR"; }
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_addr(const char* section_name, size_t section_name_len)
|
|
{
|
|
return new Addr_expression(section_name, section_name_len);
|
|
}
|
|
|
|
// ALIGNOF.
|
|
|
|
class Alignof_expression : public Section_expression
|
|
{
|
|
public:
|
|
Alignof_expression(const char* section_name, size_t section_name_len)
|
|
: Section_expression(section_name, section_name_len)
|
|
{ }
|
|
|
|
protected:
|
|
uint64_t
|
|
value_from_output_section(const Expression_eval_info*,
|
|
Output_section* os)
|
|
{ return os->addralign(); }
|
|
|
|
uint64_t
|
|
value_from_script_output_section(uint64_t, uint64_t, uint64_t addralign,
|
|
uint64_t)
|
|
{ return addralign; }
|
|
|
|
const char*
|
|
function_name() const
|
|
{ return "ALIGNOF"; }
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_alignof(const char* section_name, size_t section_name_len)
|
|
{
|
|
return new Alignof_expression(section_name, section_name_len);
|
|
}
|
|
|
|
// CONSTANT. It would be nice if we could simply evaluate this
|
|
// immediately and return an Integer_expression, but unfortunately we
|
|
// don't know the target.
|
|
|
|
class Constant_expression : public Expression
|
|
{
|
|
public:
|
|
Constant_expression(const char* name, size_t length);
|
|
|
|
uint64_t
|
|
value(const Expression_eval_info*);
|
|
|
|
void
|
|
print(FILE* f) const;
|
|
|
|
private:
|
|
enum Constant_function
|
|
{
|
|
CONSTANT_MAXPAGESIZE,
|
|
CONSTANT_COMMONPAGESIZE
|
|
};
|
|
|
|
Constant_function function_;
|
|
};
|
|
|
|
Constant_expression::Constant_expression(const char* name, size_t length)
|
|
{
|
|
if (length == 11 && strncmp(name, "MAXPAGESIZE", length) == 0)
|
|
this->function_ = CONSTANT_MAXPAGESIZE;
|
|
else if (length == 14 && strncmp(name, "COMMONPAGESIZE", length) == 0)
|
|
this->function_ = CONSTANT_COMMONPAGESIZE;
|
|
else
|
|
{
|
|
std::string s(name, length);
|
|
gold_error(_("unknown constant %s"), s.c_str());
|
|
this->function_ = CONSTANT_MAXPAGESIZE;
|
|
}
|
|
}
|
|
|
|
uint64_t
|
|
Constant_expression::value(const Expression_eval_info*)
|
|
{
|
|
switch (this->function_)
|
|
{
|
|
case CONSTANT_MAXPAGESIZE:
|
|
return parameters->target().abi_pagesize();
|
|
case CONSTANT_COMMONPAGESIZE:
|
|
return parameters->target().common_pagesize();
|
|
default:
|
|
gold_unreachable();
|
|
}
|
|
}
|
|
|
|
void
|
|
Constant_expression::print(FILE* f) const
|
|
{
|
|
const char* name;
|
|
switch (this->function_)
|
|
{
|
|
case CONSTANT_MAXPAGESIZE:
|
|
name = "MAXPAGESIZE";
|
|
break;
|
|
case CONSTANT_COMMONPAGESIZE:
|
|
name = "COMMONPAGESIZE";
|
|
break;
|
|
default:
|
|
gold_unreachable();
|
|
}
|
|
fprintf(f, "CONSTANT(%s)", name);
|
|
}
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_constant(const char* name, size_t length)
|
|
{
|
|
return new Constant_expression(name, length);
|
|
}
|
|
|
|
// DATA_SEGMENT_ALIGN. FIXME: we don't implement this; we always fall
|
|
// back to the general case.
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_data_segment_align(Expression* left, Expression*)
|
|
{
|
|
Expression* e1 = script_exp_function_align(script_exp_string(".", 1), left);
|
|
Expression* e2 = script_exp_binary_sub(left, script_exp_integer(1));
|
|
Expression* e3 = script_exp_binary_bitwise_and(script_exp_string(".", 1),
|
|
e2);
|
|
return script_exp_binary_add(e1, e3);
|
|
}
|
|
|
|
// DATA_SEGMENT_RELRO. FIXME: This is not implemented.
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_data_segment_relro_end(Expression*, Expression* right)
|
|
{
|
|
return right;
|
|
}
|
|
|
|
// DATA_SEGMENT_END. FIXME: This is not implemented.
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_data_segment_end(Expression* val)
|
|
{
|
|
return val;
|
|
}
|
|
|
|
// DEFINED function.
|
|
|
|
class Defined_expression : public Expression
|
|
{
|
|
public:
|
|
Defined_expression(const char* symbol_name, size_t symbol_name_len)
|
|
: symbol_name_(symbol_name, symbol_name_len)
|
|
{ }
|
|
|
|
uint64_t
|
|
value(const Expression_eval_info* eei)
|
|
{
|
|
Symbol* sym = eei->symtab->lookup(this->symbol_name_.c_str());
|
|
return sym != NULL && sym->is_defined();
|
|
}
|
|
|
|
void
|
|
print(FILE* f) const
|
|
{ fprintf(f, "DEFINED(%s)", this->symbol_name_.c_str()); }
|
|
|
|
private:
|
|
std::string symbol_name_;
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_defined(const char* symbol_name, size_t symbol_name_len)
|
|
{
|
|
return new Defined_expression(symbol_name, symbol_name_len);
|
|
}
|
|
|
|
// LOADADDR function
|
|
|
|
class Loadaddr_expression : public Section_expression
|
|
{
|
|
public:
|
|
Loadaddr_expression(const char* section_name, size_t section_name_len)
|
|
: Section_expression(section_name, section_name_len)
|
|
{ }
|
|
|
|
protected:
|
|
uint64_t
|
|
value_from_output_section(const Expression_eval_info* eei,
|
|
Output_section* os)
|
|
{
|
|
if (os->has_load_address())
|
|
return os->load_address();
|
|
else
|
|
{
|
|
*eei->result_section_pointer = os;
|
|
return os->address();
|
|
}
|
|
}
|
|
|
|
uint64_t
|
|
value_from_script_output_section(uint64_t, uint64_t load_address, uint64_t,
|
|
uint64_t)
|
|
{ return load_address; }
|
|
|
|
const char*
|
|
function_name() const
|
|
{ return "LOADADDR"; }
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_loadaddr(const char* section_name, size_t section_name_len)
|
|
{
|
|
return new Loadaddr_expression(section_name, section_name_len);
|
|
}
|
|
|
|
// SIZEOF function
|
|
|
|
class Sizeof_expression : public Section_expression
|
|
{
|
|
public:
|
|
Sizeof_expression(const char* section_name, size_t section_name_len)
|
|
: Section_expression(section_name, section_name_len)
|
|
{ }
|
|
|
|
protected:
|
|
uint64_t
|
|
value_from_output_section(const Expression_eval_info*,
|
|
Output_section* os)
|
|
{
|
|
// We can not use data_size here, as the size of the section may
|
|
// not have been finalized. Instead we get whatever the current
|
|
// size is. This will work correctly for backward references in
|
|
// linker scripts.
|
|
return os->current_data_size();
|
|
}
|
|
|
|
uint64_t
|
|
value_from_script_output_section(uint64_t, uint64_t, uint64_t,
|
|
uint64_t size)
|
|
{ return size; }
|
|
|
|
const char*
|
|
function_name() const
|
|
{ return "SIZEOF"; }
|
|
};
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_sizeof(const char* section_name, size_t section_name_len)
|
|
{
|
|
return new Sizeof_expression(section_name, section_name_len);
|
|
}
|
|
|
|
// SIZEOF_HEADERS.
|
|
|
|
class Sizeof_headers_expression : public Expression
|
|
{
|
|
public:
|
|
Sizeof_headers_expression()
|
|
{ }
|
|
|
|
uint64_t
|
|
value(const Expression_eval_info*);
|
|
|
|
void
|
|
print(FILE* f) const
|
|
{ fprintf(f, "SIZEOF_HEADERS"); }
|
|
};
|
|
|
|
uint64_t
|
|
Sizeof_headers_expression::value(const Expression_eval_info* eei)
|
|
{
|
|
unsigned int ehdr_size;
|
|
unsigned int phdr_size;
|
|
if (parameters->target().get_size() == 32)
|
|
{
|
|
ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size;
|
|
phdr_size = elfcpp::Elf_sizes<32>::phdr_size;
|
|
}
|
|
else if (parameters->target().get_size() == 64)
|
|
{
|
|
ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
|
|
phdr_size = elfcpp::Elf_sizes<64>::phdr_size;
|
|
}
|
|
else
|
|
gold_unreachable();
|
|
|
|
return ehdr_size + phdr_size * eei->layout->expected_segment_count();
|
|
}
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_sizeof_headers()
|
|
{
|
|
return new Sizeof_headers_expression();
|
|
}
|
|
|
|
// In the GNU linker SEGMENT_START basically returns the value for
|
|
// -Ttext, -Tdata, or -Tbss. We could implement this by copying the
|
|
// values from General_options to Parameters. But I doubt that
|
|
// anybody actually uses it. The point of it for the GNU linker was
|
|
// because -Ttext set the address of the .text section rather than the
|
|
// text segment. In gold -Ttext sets the text segment address anyhow.
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_segment_start(const char*, size_t, Expression*)
|
|
{
|
|
gold_fatal(_("SEGMENT_START not implemented"));
|
|
}
|
|
|
|
// Functions for memory regions. These can not be implemented unless
|
|
// and until we implement memory regions.
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_origin(const char*, size_t)
|
|
{
|
|
gold_fatal(_("ORIGIN not implemented"));
|
|
}
|
|
|
|
extern "C" Expression*
|
|
script_exp_function_length(const char*, size_t)
|
|
{
|
|
gold_fatal(_("LENGTH not implemented"));
|
|
}
|
|
|
|
} // End namespace gold.
|