// script-sections.cc -- linker script SECTIONS for gold
-// Copyright 2008 Free Software Foundation, Inc.
+// Copyright 2008, 2009 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <cstring>
#include <algorithm>
#include <list>
+#include <map>
#include <string>
#include <vector>
#include <fnmatch.h>
namespace gold
{
+// Manage orphan sections. This is intended to be largely compatible
+// with the GNU linker. The Linux kernel implicitly relies on
+// something similar to the GNU linker's orphan placement. We
+// originally used a simpler scheme here, but it caused the kernel
+// build to fail, and was also rather inefficient.
+
+class Orphan_section_placement
+{
+ private:
+ typedef Script_sections::Elements_iterator Elements_iterator;
+
+ public:
+ Orphan_section_placement();
+
+ // Handle an output section during initialization of this mapping.
+ void
+ output_section_init(const std::string& name, Output_section*,
+ Elements_iterator location);
+
+ // Initialize the last location.
+ void
+ last_init(Elements_iterator location);
+
+ // Set *PWHERE to the address of an iterator pointing to the
+ // location to use for an orphan section. Return true if the
+ // iterator has a value, false otherwise.
+ bool
+ find_place(Output_section*, Elements_iterator** pwhere);
+
+ // Return the iterator being used for sections at the very end of
+ // the linker script.
+ Elements_iterator
+ last_place() const;
+
+ private:
+ // The places that we specifically recognize. This list is copied
+ // from the GNU linker.
+ enum Place_index
+ {
+ PLACE_TEXT,
+ PLACE_RODATA,
+ PLACE_DATA,
+ PLACE_BSS,
+ PLACE_REL,
+ PLACE_INTERP,
+ PLACE_NONALLOC,
+ PLACE_LAST,
+ PLACE_MAX
+ };
+
+ // The information we keep for a specific place.
+ struct Place
+ {
+ // The name of sections for this place.
+ const char* name;
+ // Whether we have a location for this place.
+ bool have_location;
+ // The iterator for this place.
+ Elements_iterator location;
+ };
+
+ // Initialize one place element.
+ void
+ initialize_place(Place_index, const char*);
+
+ // The places.
+ Place places_[PLACE_MAX];
+ // True if this is the first call to output_section_init.
+ bool first_init_;
+};
+
+// Initialize Orphan_section_placement.
+
+Orphan_section_placement::Orphan_section_placement()
+ : first_init_(true)
+{
+ this->initialize_place(PLACE_TEXT, ".text");
+ this->initialize_place(PLACE_RODATA, ".rodata");
+ this->initialize_place(PLACE_DATA, ".data");
+ this->initialize_place(PLACE_BSS, ".bss");
+ this->initialize_place(PLACE_REL, NULL);
+ this->initialize_place(PLACE_INTERP, ".interp");
+ this->initialize_place(PLACE_NONALLOC, NULL);
+ this->initialize_place(PLACE_LAST, NULL);
+}
+
+// Initialize one place element.
+
+void
+Orphan_section_placement::initialize_place(Place_index index, const char* name)
+{
+ this->places_[index].name = name;
+ this->places_[index].have_location = false;
+}
+
+// While initializing the Orphan_section_placement information, this
+// is called once for each output section named in the linker script.
+// If we found an output section during the link, it will be passed in
+// OS.
+
+void
+Orphan_section_placement::output_section_init(const std::string& name,
+ Output_section* os,
+ Elements_iterator location)
+{
+ bool first_init = this->first_init_;
+ this->first_init_ = false;
+
+ for (int i = 0; i < PLACE_MAX; ++i)
+ {
+ if (this->places_[i].name != NULL && this->places_[i].name == name)
+ {
+ if (this->places_[i].have_location)
+ {
+ // We have already seen a section with this name.
+ return;
+ }
+
+ this->places_[i].location = location;
+ this->places_[i].have_location = true;
+
+ // If we just found the .bss section, restart the search for
+ // an unallocated section. This follows the GNU linker's
+ // behaviour.
+ if (i == PLACE_BSS)
+ this->places_[PLACE_NONALLOC].have_location = false;
+
+ return;
+ }
+ }
+
+ // Relocation sections.
+ if (!this->places_[PLACE_REL].have_location
+ && os != NULL
+ && (os->type() == elfcpp::SHT_REL || os->type() == elfcpp::SHT_RELA)
+ && (os->flags() & elfcpp::SHF_ALLOC) != 0)
+ {
+ this->places_[PLACE_REL].location = location;
+ this->places_[PLACE_REL].have_location = true;
+ }
+
+ // We find the location for unallocated sections by finding the
+ // first debugging or comment section after the BSS section (if
+ // there is one).
+ if (!this->places_[PLACE_NONALLOC].have_location
+ && (name == ".comment" || Layout::is_debug_info_section(name.c_str())))
+ {
+ // We add orphan sections after the location in PLACES_. We
+ // want to store unallocated sections before LOCATION. If this
+ // is the very first section, we can't use it.
+ if (!first_init)
+ {
+ --location;
+ this->places_[PLACE_NONALLOC].location = location;
+ this->places_[PLACE_NONALLOC].have_location = true;
+ }
+ }
+}
+
+// Initialize the last location.
+
+void
+Orphan_section_placement::last_init(Elements_iterator location)
+{
+ this->places_[PLACE_LAST].location = location;
+ this->places_[PLACE_LAST].have_location = true;
+}
+
+// Set *PWHERE to the address of an iterator pointing to the location
+// to use for an orphan section. Return true if the iterator has a
+// value, false otherwise.
+
+bool
+Orphan_section_placement::find_place(Output_section* os,
+ Elements_iterator** pwhere)
+{
+ // Figure out where OS should go. This is based on the GNU linker
+ // code. FIXME: The GNU linker handles small data sections
+ // specially, but we don't.
+ elfcpp::Elf_Word type = os->type();
+ elfcpp::Elf_Xword flags = os->flags();
+ Place_index index;
+ if ((flags & elfcpp::SHF_ALLOC) == 0
+ && !Layout::is_debug_info_section(os->name()))
+ index = PLACE_NONALLOC;
+ else if ((flags & elfcpp::SHF_ALLOC) == 0)
+ index = PLACE_LAST;
+ else if (type == elfcpp::SHT_NOTE)
+ index = PLACE_INTERP;
+ else if (type == elfcpp::SHT_NOBITS)
+ index = PLACE_BSS;
+ else if ((flags & elfcpp::SHF_WRITE) != 0)
+ index = PLACE_DATA;
+ else if (type == elfcpp::SHT_REL || type == elfcpp::SHT_RELA)
+ index = PLACE_REL;
+ else if ((flags & elfcpp::SHF_EXECINSTR) == 0)
+ index = PLACE_RODATA;
+ else
+ index = PLACE_TEXT;
+
+ // If we don't have a location yet, try to find one based on a
+ // plausible ordering of sections.
+ if (!this->places_[index].have_location)
+ {
+ Place_index follow;
+ switch (index)
+ {
+ default:
+ follow = PLACE_MAX;
+ break;
+ case PLACE_RODATA:
+ follow = PLACE_TEXT;
+ break;
+ case PLACE_BSS:
+ follow = PLACE_DATA;
+ break;
+ case PLACE_REL:
+ follow = PLACE_TEXT;
+ break;
+ case PLACE_INTERP:
+ follow = PLACE_TEXT;
+ break;
+ }
+ if (follow != PLACE_MAX && this->places_[follow].have_location)
+ {
+ // Set the location of INDEX to the location of FOLLOW. The
+ // location of INDEX will then be incremented by the caller,
+ // so anything in INDEX will continue to be after anything
+ // in FOLLOW.
+ this->places_[index].location = this->places_[follow].location;
+ this->places_[index].have_location = true;
+ }
+ }
+
+ *pwhere = &this->places_[index].location;
+ bool ret = this->places_[index].have_location;
+
+ // The caller will set the location.
+ this->places_[index].have_location = true;
+
+ return ret;
+}
+
+// Return the iterator being used for sections at the very end of the
+// linker script.
+
+Orphan_section_placement::Elements_iterator
+Orphan_section_placement::last_place() const
+{
+ gold_assert(this->places_[PLACE_LAST].have_location);
+ return this->places_[PLACE_LAST].location;
+}
+
// An element in a SECTIONS clause.
class Sections_element
virtual ~Sections_element()
{ }
+ // Return whether an output section is relro.
+ virtual bool
+ is_relro() const
+ { return false; }
+
+ // Record that an output section is relro.
+ virtual void
+ set_is_relro()
+ { }
+
+ // Create any required output sections. The only real
+ // implementation is in Output_section_definition.
+ virtual void
+ create_sections(Layout*)
+ { }
+
// Add any symbol being defined to the symbol table.
virtual void
add_symbols_to_table(Symbol_table*)
// Finalize symbols and check assertions.
virtual void
- finalize_symbols(Symbol_table*, const Layout*, bool*, uint64_t*)
+ finalize_symbols(Symbol_table*, const Layout*, uint64_t*)
{ }
// Return the output section name to use for an input file name and
output_section_name(const char*, const char*, Output_section***)
{ return NULL; }
- // Return whether to place an orphan output section after this
- // element.
- virtual bool
- place_orphan_here(const Output_section *, bool*) const
- { return false; }
+ // Initialize OSP with an output section.
+ virtual void
+ orphan_section_init(Orphan_section_placement*,
+ Script_sections::Elements_iterator)
+ { }
// Set section addresses. This includes applying assignments if the
// the expression is an absolute value.
virtual void
- set_section_addresses(Symbol_table*, Layout*, bool*, uint64_t*)
+ set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*)
{ }
// Check a constraint (ONLY_IF_RO, etc.) on an output section. If
alternate_constraint(Output_section_definition*, Section_constraint)
{ return false; }
+ // Get the list of segments to use for an allocated section when
+ // using a PHDRS clause. If this is an allocated section, return
+ // the Output_section, and set *PHDRS_LIST (the first parameter) to
+ // the list of PHDRS to which it should be attached. If the PHDRS
+ // were not specified, don't change *PHDRS_LIST. When not returning
+ // NULL, set *ORPHAN (the second parameter) according to whether
+ // this is an orphan section--one that is not mentioned in the
+ // linker script.
+ virtual Output_section*
+ allocate_to_segment(String_list**, bool*)
+ { return NULL; }
+
+ // Look for an output section by name and return the address, the
+ // load address, the alignment, and the size. This is used when an
+ // expression refers to an output section which was not actually
+ // created. This returns true if the section was found, false
+ // otherwise. The only real definition is for
+ // Output_section_definition.
+ virtual bool
+ get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*,
+ uint64_t*) const
+ { return false; }
+
+ // Return the associated Output_section if there is one.
+ virtual Output_section*
+ get_output_section() const
+ { return NULL; }
+
// Print the element for debugging purposes.
virtual void
print(FILE* f) const = 0;
// Finalize the symbol.
void
finalize_symbols(Symbol_table* symtab, const Layout* layout,
- bool* dot_has_value, uint64_t* dot_value)
+ uint64_t* dot_value)
{
- this->assignment_.finalize_with_dot(symtab, layout, *dot_has_value,
- *dot_value);
+ this->assignment_.finalize_with_dot(symtab, layout, *dot_value, NULL);
}
// Set the section address. There is no section here, but if the
// absolute symbols when setting dot.
void
set_section_addresses(Symbol_table* symtab, Layout* layout,
- bool* dot_has_value, uint64_t* dot_value)
+ uint64_t* dot_value, uint64_t*)
{
- this->assignment_.set_if_absolute(symtab, layout, true, *dot_has_value,
- *dot_value);
+ this->assignment_.set_if_absolute(symtab, layout, true, *dot_value);
}
// Print for debugging.
// Finalize the symbol.
void
finalize_symbols(Symbol_table* symtab, const Layout* layout,
- bool* dot_has_value, uint64_t* dot_value)
+ uint64_t* dot_value)
{
- bool dummy;
- *dot_value = this->val_->eval_with_dot(symtab, layout, *dot_has_value,
- *dot_value, &dummy);
- *dot_has_value = true;
+ // We ignore the section of the result because outside of an
+ // output section definition the dot symbol is always considered
+ // to be absolute.
+ Output_section* dummy;
+ *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value,
+ NULL, &dummy);
}
// Update the dot symbol while setting section addresses.
void
set_section_addresses(Symbol_table* symtab, Layout* layout,
- bool* dot_has_value, uint64_t* dot_value)
+ uint64_t* dot_value, uint64_t* load_address)
{
- bool is_absolute;
- *dot_value = this->val_->eval_with_dot(symtab, layout, *dot_has_value,
- *dot_value, &is_absolute);
- if (!is_absolute)
- gold_error(_("dot set to non-absolute value"));
- *dot_has_value = true;
+ Output_section* dummy;
+ *dot_value = this->val_->eval_with_dot(symtab, layout, false, *dot_value,
+ NULL, &dummy);
+ *load_address = *dot_value;
}
// Print for debugging.
// Check the assertion.
void
- finalize_symbols(Symbol_table* symtab, const Layout* layout, bool*,
- uint64_t*)
+ finalize_symbols(Symbol_table* symtab, const Layout* layout, uint64_t*)
{ this->assertion_.check(symtab, layout); }
// Print for debugging.
{
public:
// A list of input sections.
- typedef std::list<std::pair<Relobj*, unsigned int> > Input_section_list;
+ typedef std::list<Output_section::Simple_input_section> Input_section_list;
Output_section_element()
{ }
virtual ~Output_section_element()
{ }
+ // Return whether this element requires an output section to exist.
+ virtual bool
+ needs_output_section() const
+ { return false; }
+
// Add any symbol being defined to the symbol table.
virtual void
add_symbols_to_table(Symbol_table*)
// Finalize symbols and check assertions.
virtual void
- finalize_symbols(Symbol_table*, const Layout*, bool*, uint64_t*)
+ finalize_symbols(Symbol_table*, const Layout*, uint64_t*, Output_section**)
{ }
// Return whether this element matches FILE_NAME and SECTION_NAME.
// the expression is an absolute value.
virtual void
set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t,
- uint64_t*, std::string*, Input_section_list*)
+ uint64_t*, Output_section**, std::string*,
+ Input_section_list*)
{ }
// Print the element for debugging purposes.
// Finalize the symbol.
void
finalize_symbols(Symbol_table* symtab, const Layout* layout,
- bool* dot_has_value, uint64_t* dot_value)
+ uint64_t* dot_value, Output_section** dot_section)
{
- this->assignment_.finalize_with_dot(symtab, layout, *dot_has_value,
- *dot_value);
+ this->assignment_.finalize_with_dot(symtab, layout, *dot_value,
+ *dot_section);
}
// Set the section address. There is no section here, but if the
// absolute symbols when setting dot.
void
set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*,
- uint64_t, uint64_t* dot_value, std::string*,
- Input_section_list*)
+ uint64_t, uint64_t* dot_value, Output_section**,
+ std::string*, Input_section_list*)
{
- this->assignment_.set_if_absolute(symtab, layout, true, true, *dot_value);
+ this->assignment_.set_if_absolute(symtab, layout, true, *dot_value);
}
// Print for debugging.
// Finalize the symbol.
void
finalize_symbols(Symbol_table* symtab, const Layout* layout,
- bool* dot_has_value, uint64_t* dot_value)
+ uint64_t* dot_value, Output_section** dot_section)
{
- bool dummy;
- *dot_value = this->val_->eval_with_dot(symtab, layout, *dot_has_value,
- *dot_value, &dummy);
- *dot_has_value = true;
+ *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value,
+ *dot_section, dot_section);
}
// Update the dot symbol while setting section addresses.
void
set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*,
- uint64_t, uint64_t* dot_value, std::string*,
- Input_section_list*);
+ uint64_t, uint64_t* dot_value, Output_section**,
+ std::string*, Input_section_list*);
// Print for debugging.
void
Output_section* output_section,
uint64_t,
uint64_t* dot_value,
+ Output_section** dot_section,
std::string* fill,
Input_section_list*)
{
- bool is_absolute;
- uint64_t next_dot = this->val_->eval_with_dot(symtab, layout, true,
- *dot_value, &is_absolute);
- if (!is_absolute)
- gold_error(_("dot set to non-absolute value"));
+ uint64_t next_dot = this->val_->eval_with_dot(symtab, layout, false,
+ *dot_value, *dot_section,
+ dot_section);
if (next_dot < *dot_value)
gold_error(_("dot may not move backward"));
if (next_dot > *dot_value && output_section != NULL)
- *dot_value);
Output_section_data* posd;
if (fill->empty())
- posd = new Output_data_fixed_space(length, 0);
+ posd = new Output_data_zero_fill(length, 0);
else
{
std::string this_fill = this->get_fill_string(fill, length);
posd = new Output_data_const(this_fill, 0);
}
output_section->add_output_section_data(posd);
+ layout->new_output_section_data_from_script(posd);
}
*dot_value = next_dot;
}
Script_assertion assertion_;
};
-// A data item in an output section.
+// We use a special instance of Output_section_data to handle BYTE,
+// SHORT, etc. This permits forward references to symbols in the
+// expressions.
-class Output_section_element_data : public Output_section_element
+class Output_data_expression : public Output_section_data
{
public:
- Output_section_element_data(int size, bool is_signed, Expression* val)
- : size_(size), is_signed_(is_signed), val_(val)
+ Output_data_expression(int size, bool is_signed, Expression* val,
+ const Symbol_table* symtab, const Layout* layout,
+ uint64_t dot_value, Output_section* dot_section)
+ : Output_section_data(size, 0, true),
+ is_signed_(is_signed), val_(val), symtab_(symtab),
+ layout_(layout), dot_value_(dot_value), dot_section_(dot_section)
{ }
- // Finalize symbols--we just need to update dot.
+ protected:
+ // Write the data to the output file.
void
- finalize_symbols(Symbol_table*, const Layout*, bool*, uint64_t* dot_value)
- { *dot_value += this->size_; }
+ do_write(Output_file*);
- // Store the value in the section.
+ // Write the data to a buffer.
void
- set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t,
- uint64_t* dot_value, std::string*,
- Input_section_list*);
+ do_write_to_buffer(unsigned char*);
- // Print for debugging.
+ // Write to a map file.
void
- print(FILE*) const;
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, _("** expression")); }
private:
template<bool big_endian>
- std::string
- set_fill_string(uint64_t);
+ void
+ endian_write_to_buffer(uint64_t, unsigned char*);
- // The size in bytes.
- int size_;
- // Whether the value is signed.
bool is_signed_;
- // The value.
Expression* val_;
+ const Symbol_table* symtab_;
+ const Layout* layout_;
+ uint64_t dot_value_;
+ Output_section* dot_section_;
};
-// Store the value in the section.
+// Write the data element to the output file.
void
-Output_section_element_data::set_section_addresses(Symbol_table* symtab,
- Layout* layout,
- Output_section* os,
- uint64_t,
- uint64_t* dot_value,
- std::string*,
- Input_section_list*)
+Output_data_expression::do_write(Output_file* of)
{
- gold_assert(os != NULL);
-
- bool is_absolute;
- uint64_t val = this->val_->eval_with_dot(symtab, layout, true, *dot_value,
- &is_absolute);
- if (!is_absolute)
- gold_error(_("data directive with non-absolute value"));
+ unsigned char* view = of->get_output_view(this->offset(), this->data_size());
+ this->write_to_buffer(view);
+ of->write_output_view(this->offset(), this->data_size(), view);
+}
- std::string fill;
- if (parameters->is_big_endian())
- fill = this->set_fill_string<true>(val);
- else
- fill = this->set_fill_string<false>(val);
+// Write the data element to a buffer.
- os->add_output_section_data(new Output_data_const(fill, 0));
+void
+Output_data_expression::do_write_to_buffer(unsigned char* buf)
+{
+ Output_section* dummy;
+ uint64_t val = this->val_->eval_with_dot(this->symtab_, this->layout_,
+ true, this->dot_value_,
+ this->dot_section_, &dummy);
- *dot_value += this->size_;
+ if (parameters->target().is_big_endian())
+ this->endian_write_to_buffer<true>(val, buf);
+ else
+ this->endian_write_to_buffer<false>(val, buf);
}
-// Get the value to store in a std::string.
-
template<bool big_endian>
-std::string
- Output_section_element_data::set_fill_string(uint64_t val)
+void
+Output_data_expression::endian_write_to_buffer(uint64_t val,
+ unsigned char* buf)
{
- std::string ret;
- unsigned char buf[8];
- switch (this->size_)
+ switch (this->data_size())
{
case 1:
elfcpp::Swap_unaligned<8, big_endian>::writeval(buf, val);
- ret.assign(reinterpret_cast<char*>(buf), 1);
break;
case 2:
elfcpp::Swap_unaligned<16, big_endian>::writeval(buf, val);
- ret.assign(reinterpret_cast<char*>(buf), 2);
break;
case 4:
elfcpp::Swap_unaligned<32, big_endian>::writeval(buf, val);
- ret.assign(reinterpret_cast<char*>(buf), 4);
break;
case 8:
- if (parameters->get_size() == 32)
+ if (parameters->target().get_size() == 32)
{
val &= 0xffffffff;
if (this->is_signed_ && (val & 0x80000000) != 0)
val |= 0xffffffff00000000LL;
}
elfcpp::Swap_unaligned<64, big_endian>::writeval(buf, val);
- ret.assign(reinterpret_cast<char*>(buf), 8);
break;
default:
gold_unreachable();
}
- return ret;
+}
+
+// A data item in an output section.
+
+class Output_section_element_data : public Output_section_element
+{
+ public:
+ Output_section_element_data(int size, bool is_signed, Expression* val)
+ : size_(size), is_signed_(is_signed), val_(val)
+ { }
+
+ // If there is a data item, then we must create an output section.
+ bool
+ needs_output_section() const
+ { return true; }
+
+ // Finalize symbols--we just need to update dot.
+ void
+ finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value,
+ Output_section**)
+ { *dot_value += this->size_; }
+
+ // Store the value in the section.
+ void
+ set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t,
+ uint64_t* dot_value, Output_section**, std::string*,
+ Input_section_list*);
+
+ // Print for debugging.
+ void
+ print(FILE*) const;
+
+ private:
+ // The size in bytes.
+ int size_;
+ // Whether the value is signed.
+ bool is_signed_;
+ // The value.
+ Expression* val_;
+};
+
+// Store the value in the section.
+
+void
+Output_section_element_data::set_section_addresses(
+ Symbol_table* symtab,
+ Layout* layout,
+ Output_section* os,
+ uint64_t,
+ uint64_t* dot_value,
+ Output_section** dot_section,
+ std::string*,
+ Input_section_list*)
+{
+ gold_assert(os != NULL);
+ Output_data_expression* expression =
+ new Output_data_expression(this->size_, this->is_signed_, this->val_,
+ symtab, layout, *dot_value, *dot_section);
+ os->add_output_section_data(expression);
+ layout->new_output_section_data_from_script(expression);
+ *dot_value += this->size_;
}
// Print for debugging.
// Update the fill value while setting section addresses.
void
set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*,
- uint64_t, uint64_t* dot_value, std::string* fill,
- Input_section_list*)
+ uint64_t, uint64_t* dot_value,
+ Output_section** dot_section,
+ std::string* fill, Input_section_list*)
{
- bool is_absolute;
- uint64_t fill_val = this->val_->eval_with_dot(symtab, layout, true,
- *dot_value,
- &is_absolute);
- if (!is_absolute)
- gold_error(_("fill set to non-absolute value"));
+ Output_section* fill_section;
+ uint64_t fill_val = this->val_->eval_with_dot(symtab, layout, false,
+ *dot_value, *dot_section,
+ &fill_section);
+ if (fill_section != NULL)
+ gold_warning(_("fill value is not absolute"));
// FIXME: The GNU linker supports fill values of arbitrary length.
unsigned char fill_buff[4];
elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val);
// Finalize symbols--just update the value of the dot symbol.
void
- finalize_symbols(Symbol_table*, const Layout*, bool* dot_has_value,
- uint64_t* dot_value)
+ finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value,
+ Output_section** dot_section)
{
*dot_value = this->final_dot_value_;
- *dot_has_value = true;
+ *dot_section = this->final_dot_section_;
}
// See whether we match FILE_NAME and SECTION_NAME as an input
void
set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*,
uint64_t subalign, uint64_t* dot_value,
- std::string* fill, Input_section_list*);
+ Output_section**, std::string* fill,
+ Input_section_list*);
// Print for debugging.
void
bool keep_;
// The value of dot after including all matching sections.
uint64_t final_dot_value_;
+ // The section where dot is defined after including all matching
+ // sections.
+ Output_section* final_dot_section_;
};
// Construct Output_section_element_input. The parser records strings
filename_exclusions_(),
input_section_patterns_(),
keep_(keep),
- final_dot_value_(0)
+ final_dot_value_(0),
+ final_dot_section_(NULL)
{
// The filename pattern "*" is common, and matches all files. Turn
// it into the empty string.
// Information we use to sort the input sections.
-struct Input_section_info
+class Input_section_info
{
- Relobj* relobj;
- unsigned int shndx;
- std::string section_name;
- uint64_t size;
- uint64_t addralign;
+ public:
+ Input_section_info(const Output_section::Simple_input_section& inputsection)
+ : input_section_(inputsection), section_name_(),
+ size_(0), addralign_(1)
+ { }
+
+ // Return the simple input section.
+ const Output_section::Simple_input_section&
+ input_section() const
+ { return this->input_section_; }
+
+ // Return the object.
+ Relobj*
+ relobj() const
+ { return this->input_section_.relobj(); }
+
+ // Return the section index.
+ unsigned int
+ shndx()
+ { return this->input_section_.shndx(); }
+
+ // Return the section name.
+ const std::string&
+ section_name() const
+ { return this->section_name_; }
+
+ // Set the section name.
+ void
+ set_section_name(const std::string aname)
+ { this->section_name_ = aname; }
+
+ // Return the section size.
+ uint64_t
+ size() const
+ { return this->size_; }
+
+ // Set the section size.
+ void
+ set_size(uint64_t sec_size)
+ { this->size_ = sec_size; }
+
+ // Return the address alignment.
+ uint64_t
+ addralign() const
+ { return this->addralign_; }
+
+ // Set the address alignment.
+ void
+ set_addralign(uint64_t addr_align)
+ { this->addralign_ = addr_align; }
+
+ private:
+ // Input section, can be a relaxed section.
+ Output_section::Simple_input_section input_section_;
+ // Name of the section.
+ std::string section_name_;
+ // Section size.
+ uint64_t size_;
+ // Address alignment.
+ uint64_t addralign_;
};
// A class to sort the input sections.
if (this->section_sort_ == SORT_WILDCARD_BY_NAME
|| this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT
|| (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME
- && isi1.addralign == isi2.addralign))
+ && isi1.addralign() == isi2.addralign()))
{
- if (isi1.section_name != isi2.section_name)
- return isi1.section_name < isi2.section_name;
+ if (isi1.section_name() != isi2.section_name())
+ return isi1.section_name() < isi2.section_name();
}
if (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT
|| this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT
|| this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME)
{
- if (isi1.addralign != isi2.addralign)
- return isi1.addralign < isi2.addralign;
+ if (isi1.addralign() != isi2.addralign())
+ return isi1.addralign() < isi2.addralign();
}
if (this->filename_sort_ == SORT_WILDCARD_BY_NAME)
{
- if (isi1.relobj->name() != isi2.relobj->name())
- return isi1.relobj->name() < isi2.relobj->name();
+ if (isi1.relobj()->name() != isi2.relobj()->name())
+ return (isi1.relobj()->name() < isi2.relobj()->name());
}
// Otherwise we leave them in the same order.
void
Output_section_element_input::set_section_addresses(
Symbol_table*,
- Layout*,
+ Layout* layout,
Output_section* output_section,
uint64_t subalign,
uint64_t* dot_value,
+ Output_section** dot_section,
std::string* fill,
Input_section_list* input_sections)
{
Input_section_list::iterator p = input_sections->begin();
while (p != input_sections->end())
{
+ Relobj* relobj = p->relobj();
+ unsigned int shndx = p->shndx();
+ Input_section_info isi(*p);
+
// Calling section_name and section_addralign is not very
// efficient.
- Input_section_info isi;
- isi.relobj = p->first;
- isi.shndx = p->second;
// Lock the object so that we can get information about the
// section. This is OK since we know we are single-threaded
// here.
{
const Task* task = reinterpret_cast<const Task*>(-1);
- Task_lock_obj<Object> tl(task, p->first);
-
- isi.section_name = p->first->section_name(p->second);
- isi.size = p->first->section_size(p->second);
- isi.addralign = p->first->section_addralign(p->second);
+ Task_lock_obj<Object> tl(task, relobj);
+
+ isi.set_section_name(relobj->section_name(shndx));
+ if (p->is_relaxed_input_section())
+ {
+ // We use current data size because relxed section sizes may not
+ // have finalized yet.
+ isi.set_size(p->relaxed_input_section()->current_data_size());
+ isi.set_addralign(p->relaxed_input_section()->addralign());
+ }
+ else
+ {
+ isi.set_size(relobj->section_size(shndx));
+ isi.set_addralign(relobj->section_addralign(shndx));
+ }
}
- if (!this->match_file_name(isi.relobj->name().c_str()))
+ if (!this->match_file_name(relobj->name().c_str()))
++p;
else if (this->input_section_patterns_.empty())
{
{
const Input_section_pattern&
isp(this->input_section_patterns_[i]);
- if (match(isi.section_name.c_str(), isp.pattern.c_str(),
+ if (match(isi.section_name().c_str(), isp.pattern.c_str(),
isp.pattern_is_wildcard))
break;
}
// sections are otherwise equal. Add each input section to the
// output section.
+ uint64_t dot = *dot_value;
for (size_t i = 0; i < input_pattern_count; ++i)
{
if (matching_sections[i].empty())
Input_section_sorter(this->filename_sort_,
isp.sort));
- for (std::vector<Input_section_info>::const_iterator p =
+ for (std::vector<Input_section_info>::const_iterator q =
matching_sections[i].begin();
- p != matching_sections[i].end();
- ++p)
+ q != matching_sections[i].end();
+ ++q)
{
- uint64_t this_subalign = p->addralign;
+ uint64_t this_subalign = q->addralign();
if (this_subalign < subalign)
this_subalign = subalign;
- uint64_t address = align_address(*dot_value, this_subalign);
+ uint64_t address = align_address(dot, this_subalign);
- if (address > *dot_value && !fill->empty())
+ if (address > dot && !fill->empty())
{
section_size_type length =
- convert_to_section_size_type(address - *dot_value);
+ convert_to_section_size_type(address - dot);
std::string this_fill = this->get_fill_string(fill, length);
Output_section_data* posd = new Output_data_const(this_fill, 0);
output_section->add_output_section_data(posd);
+ layout->new_output_section_data_from_script(posd);
}
- output_section->add_input_section_for_script(p->relobj,
- p->shndx,
- p->size,
+ output_section->add_input_section_for_script(q->input_section(),
+ q->size(),
this_subalign);
- *dot_value = address + p->size;
+ dot = address + q->size();
}
}
+ // An SHF_TLS/SHT_NOBITS section does not take up any
+ // address space.
+ if (output_section == NULL
+ || (output_section->flags() & elfcpp::SHF_TLS) == 0
+ || output_section->type() != elfcpp::SHT_NOBITS)
+ *dot_value = dot;
+
this->final_dot_value_ = *dot_value;
+ this->final_dot_section_ = *dot_section;
}
// Print for debugging.
void
add_input_section(const Input_section_spec* spec, bool keep);
+ // Return whether the output section is relro.
+ bool
+ is_relro() const
+ { return this->is_relro_; }
+
+ // Record that the output section is relro.
+ void
+ set_is_relro()
+ { this->is_relro_ = true; }
+
+ // Create any required output sections.
+ void
+ create_sections(Layout*);
+
// Add any symbols being defined to the symbol table.
void
add_symbols_to_table(Symbol_table* symtab);
// Finalize symbols and check assertions.
void
- finalize_symbols(Symbol_table*, const Layout*, bool*, uint64_t*);
+ finalize_symbols(Symbol_table*, const Layout*, uint64_t*);
// Return the output section name to use for an input file name and
// section name.
output_section_name(const char* file_name, const char* section_name,
Output_section***);
- // Return whether to place an orphan section after this one.
- bool
- place_orphan_here(const Output_section *os, bool* exact) const;
+ // Initialize OSP with an output section.
+ void
+ orphan_section_init(Orphan_section_placement* osp,
+ Script_sections::Elements_iterator p)
+ { osp->output_section_init(this->name_, this->output_section_, p); }
// Set the section address.
void
set_section_addresses(Symbol_table* symtab, Layout* layout,
- bool* dot_has_value, uint64_t* dot_value);
+ uint64_t* dot_value, uint64_t* load_address);
// Check a constraint (ONLY_IF_RO, etc.) on an output section. If
// this section is constrained, and the input sections do not match,
bool
alternate_constraint(Output_section_definition*, Section_constraint);
+ // Get the list of segments to use for an allocated section when
+ // using a PHDRS clause.
+ Output_section*
+ allocate_to_segment(String_list** phdrs_list, bool* orphan);
+
+ // Look for an output section by name and return the address, the
+ // load address, the alignment, and the size. This is used when an
+ // expression refers to an output section which was not actually
+ // created. This returns true if the section was found, false
+ // otherwise.
+ bool
+ get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*,
+ uint64_t*) const;
+
+ // Return the associated Output_section if there is one.
+ Output_section*
+ get_output_section() const
+ { return this->output_section_; }
+
// Print the contents to the FILE. This is for debugging.
void
print(FILE*) const;
Section_constraint constraint_;
// The fill value. This may be NULL.
Expression* fill_;
+ // The list of segments this section should go into. This may be
+ // NULL.
+ String_list* phdrs_;
// The list of elements defining the section.
Output_section_elements elements_;
// The Output_section created for this definition. This will be
// NULL if none was created.
Output_section* output_section_;
+ // The address after it has been evaluated.
+ uint64_t evaluated_address_;
+ // The load address after it has been evaluated.
+ uint64_t evaluated_load_address_;
+ // The alignment after it has been evaluated.
+ uint64_t evaluated_addralign_;
+ // The output section is relro.
+ bool is_relro_;
};
// Constructor.
subalign_(header->subalign),
constraint_(header->constraint),
fill_(NULL),
+ phdrs_(NULL),
elements_(),
- output_section_(NULL)
+ output_section_(NULL),
+ evaluated_address_(0),
+ evaluated_load_address_(0),
+ evaluated_addralign_(0),
+ is_relro_(false)
{
}
Output_section_definition::finish(const Parser_output_section_trailer* trailer)
{
this->fill_ = trailer->fill;
+ this->phdrs_ = trailer->phdrs;
}
// Add a symbol to be defined.
this->elements_.push_back(p);
}
+// Create any required output sections. We need an output section if
+// there is a data statement here.
+
+void
+Output_section_definition::create_sections(Layout* layout)
+{
+ if (this->output_section_ != NULL)
+ return;
+ for (Output_section_elements::const_iterator p = this->elements_.begin();
+ p != this->elements_.end();
+ ++p)
+ {
+ if ((*p)->needs_output_section())
+ {
+ const char* name = this->name_.c_str();
+ this->output_section_ = layout->make_output_section_for_script(name);
+ return;
+ }
+ }
+}
+
// Add any symbols being defined to the symbol table.
void
void
Output_section_definition::finalize_symbols(Symbol_table* symtab,
const Layout* layout,
- bool* dot_has_value,
uint64_t* dot_value)
{
if (this->output_section_ != NULL)
uint64_t address = *dot_value;
if (this->address_ != NULL)
{
- bool dummy;
- address = this->address_->eval_with_dot(symtab, layout,
- *dot_has_value, *dot_value,
+ Output_section* dummy;
+ address = this->address_->eval_with_dot(symtab, layout, true,
+ *dot_value, NULL,
&dummy);
}
if (this->align_ != NULL)
{
- bool dummy;
- uint64_t align = this->align_->eval_with_dot(symtab, layout,
- *dot_has_value,
+ Output_section* dummy;
+ uint64_t align = this->align_->eval_with_dot(symtab, layout, true,
*dot_value,
+ NULL,
&dummy);
address = align_address(address, align);
}
*dot_value = address;
}
- *dot_has_value = true;
+ Output_section* dot_section = this->output_section_;
for (Output_section_elements::iterator p = this->elements_.begin();
p != this->elements_.end();
++p)
- (*p)->finalize_symbols(symtab, layout, dot_has_value, dot_value);
+ (*p)->finalize_symbols(symtab, layout, dot_value, &dot_section);
}
// Return the output section name to use for an input section name.
return NULL;
}
-// Return whether to place an orphan output section after this
-// section.
+// Set the section address. Note that the OUTPUT_SECTION_ field will
+// be NULL if no input sections were mapped to this output section.
+// We still have to adjust dot and process symbol assignments.
-bool
-Output_section_definition::place_orphan_here(const Output_section *os,
- bool* exact) const
+void
+Output_section_definition::set_section_addresses(Symbol_table* symtab,
+ Layout* layout,
+ uint64_t* dot_value,
+ uint64_t* load_address)
{
- // Check for the simple case first.
- if (this->output_section_ != NULL
- && this->output_section_->type() == os->type()
- && this->output_section_->flags() == os->flags())
+ uint64_t address;
+ if (this->address_ == NULL)
+ address = *dot_value;
+ else
{
- *exact = true;
- return true;
- }
-
- // Otherwise use some heuristics.
-
- if ((os->flags() & elfcpp::SHF_ALLOC) == 0)
- return false;
-
- if (os->type() == elfcpp::SHT_NOBITS)
- {
- if (this->output_section_ != NULL
- && this->output_section_->type() == elfcpp::SHT_NOBITS)
- return true;
- if (this->name_ == ".bss")
- return true;
- }
- else if (os->type() == elfcpp::SHT_NOTE)
- {
- if (this->output_section_ != NULL
- && this->output_section_->type() == elfcpp::SHT_NOTE)
- return true;
- if (this->name_ == ".interp"
- || this->name_.compare(0, 5, ".note") == 0)
- return true;
- }
- else if (os->type() == elfcpp::SHT_REL || os->type() == elfcpp::SHT_RELA)
- {
- if (this->output_section_ != NULL
- && (this->output_section_->type() == elfcpp::SHT_REL
- || this->output_section_->type() == elfcpp::SHT_RELA))
- return true;
- if (this->name_.compare(0, 4, ".rel") == 0)
- return true;
- }
- else if (os->type() == elfcpp::SHT_PROGBITS
- && (os->flags() & elfcpp::SHF_WRITE) != 0)
- {
- if (this->output_section_ != NULL
- && this->output_section_->type() == elfcpp::SHT_PROGBITS
- && (this->output_section_->flags() & elfcpp::SHF_WRITE) != 0)
- return true;
- if (this->name_ == ".data")
- return true;
- }
- else if (os->type() == elfcpp::SHT_PROGBITS
- && (os->flags() & elfcpp::SHF_EXECINSTR) != 0)
- {
- if (this->output_section_ != NULL
- && this->output_section_->type() == elfcpp::SHT_PROGBITS
- && (this->output_section_->flags() & elfcpp::SHF_EXECINSTR) != 0)
- return true;
- if (this->name_ == ".text")
- return true;
- }
- else if (os->type() == elfcpp::SHT_PROGBITS)
- {
- if (this->output_section_ != NULL
- && this->output_section_->type() == elfcpp::SHT_PROGBITS
- && (this->output_section_->flags() & elfcpp::SHF_WRITE) == 0
- && (this->output_section_->flags() & elfcpp::SHF_EXECINSTR) == 0)
- return true;
- if (this->name_ == ".rodata")
- return true;
- }
-
- return false;
-}
-
-// Set the section address. Note that the OUTPUT_SECTION_ field will
-// be NULL if no input sections were mapped to this output section.
-// We still have to adjust dot and process symbol assignments.
-
-void
-Output_section_definition::set_section_addresses(Symbol_table* symtab,
- Layout* layout,
- bool* dot_has_value,
- uint64_t* dot_value)
-{
- bool is_absolute;
- uint64_t address;
- if (this->address_ != NULL)
- {
- address = this->address_->eval_with_dot(symtab, layout, *dot_has_value,
- *dot_value, &is_absolute);
- if (!is_absolute)
- gold_error(_("address of section %s is not absolute"),
- this->name_.c_str());
- }
- else
- {
- if (!*dot_has_value)
- gold_error(_("no address given for section %s"),
- this->name_.c_str());
- address = *dot_value;
+ Output_section* dummy;
+ address = this->address_->eval_with_dot(symtab, layout, true,
+ *dot_value, NULL, &dummy);
}
uint64_t align;
}
else
{
- align = this->align_->eval_with_dot(symtab, layout, *dot_has_value,
- *dot_value, &is_absolute);
- if (!is_absolute)
- gold_error(_("alignment of section %s is not absolute"),
- this->name_.c_str());
+ Output_section* align_section;
+ align = this->align_->eval_with_dot(symtab, layout, true, *dot_value,
+ NULL, &align_section);
+ if (align_section != NULL)
+ gold_warning(_("alignment of section %s is not absolute"),
+ this->name_.c_str());
if (this->output_section_ != NULL)
this->output_section_->set_addralign(align);
}
address = align_address(address, align);
+ uint64_t start_address = address;
+
*dot_value = address;
- *dot_has_value = true;
// The address of non-SHF_ALLOC sections is forced to zero,
// regardless of what the linker script wants.
&& (this->output_section_->flags() & elfcpp::SHF_ALLOC) != 0)
this->output_section_->set_address(address);
- if (this->load_address_ != NULL && this->output_section_ != NULL)
+ this->evaluated_address_ = address;
+ this->evaluated_addralign_ = align;
+
+ if (this->load_address_ == NULL)
+ this->evaluated_load_address_ = address;
+ else
{
- uint64_t load_address =
- this->load_address_->eval_with_dot(symtab, layout, *dot_has_value,
- *dot_value, &is_absolute);
- if (!is_absolute)
- gold_error(_("load address of section %s is not absolute"),
- this->name_.c_str());
- this->output_section_->set_load_address(load_address);
+ Output_section* dummy;
+ uint64_t laddr =
+ this->load_address_->eval_with_dot(symtab, layout, true, *dot_value,
+ this->output_section_, &dummy);
+ if (this->output_section_ != NULL)
+ this->output_section_->set_load_address(laddr);
+ this->evaluated_load_address_ = laddr;
}
uint64_t subalign;
subalign = 0;
else
{
- subalign = this->subalign_->eval_with_dot(symtab, layout, *dot_has_value,
- *dot_value, &is_absolute);
- if (!is_absolute)
- gold_error(_("subalign of section %s is not absolute"),
- this->name_.c_str());
+ Output_section* subalign_section;
+ subalign = this->subalign_->eval_with_dot(symtab, layout, true,
+ *dot_value, NULL,
+ &subalign_section);
+ if (subalign_section != NULL)
+ gold_warning(_("subalign of section %s is not absolute"),
+ this->name_.c_str());
}
std::string fill;
{
// FIXME: The GNU linker supports fill values of arbitrary
// length.
- uint64_t fill_val = this->fill_->eval_with_dot(symtab, layout,
- *dot_has_value,
+ Output_section* fill_section;
+ uint64_t fill_val = this->fill_->eval_with_dot(symtab, layout, true,
*dot_value,
- &is_absolute);
- if (!is_absolute)
- gold_error(_("fill of section %s is not absolute"),
- this->name_.c_str());
+ NULL,
+ &fill_section);
+ if (fill_section != NULL)
+ gold_warning(_("fill of section %s is not absolute"),
+ this->name_.c_str());
unsigned char fill_buff[4];
elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val);
fill.assign(reinterpret_cast<char*>(fill_buff), 4);
*dot_value = address;
}
+ Output_section* dot_section = this->output_section_;
for (Output_section_elements::iterator p = this->elements_.begin();
p != this->elements_.end();
++p)
(*p)->set_section_addresses(symtab, layout, this->output_section_,
- subalign, dot_value, &fill, &input_sections);
+ subalign, dot_value, &dot_section, &fill,
+ &input_sections);
gold_assert(input_sections.empty());
+
+ if (this->load_address_ == NULL || this->output_section_ == NULL)
+ *load_address = *dot_value;
+ else
+ *load_address = (this->output_section_->load_address()
+ + (*dot_value - start_address));
+
+ if (this->output_section_ != NULL)
+ {
+ if (this->is_relro_)
+ this->output_section_->set_is_relro();
+ else
+ this->output_section_->clear_is_relro();
+ }
}
// Check a constraint (ONLY_IF_RO, etc.) on an output section. If
this->output_section_ = posd->output_section_;
posd->output_section_ = NULL;
+ if (this->is_relro_)
+ this->output_section_->set_is_relro();
+ else
+ this->output_section_->clear_is_relro();
+
+ return true;
+}
+
+// Get the list of segments to use for an allocated section when using
+// a PHDRS clause.
+
+Output_section*
+Output_section_definition::allocate_to_segment(String_list** phdrs_list,
+ bool* orphan)
+{
+ if (this->output_section_ == NULL)
+ return NULL;
+ if ((this->output_section_->flags() & elfcpp::SHF_ALLOC) == 0)
+ return NULL;
+ *orphan = false;
+ if (this->phdrs_ != NULL)
+ *phdrs_list = this->phdrs_;
+ return this->output_section_;
+}
+
+// Look for an output section by name and return the address, the load
+// address, the alignment, and the size. This is used when an
+// expression refers to an output section which was not actually
+// created. This returns true if the section was found, false
+// otherwise.
+
+bool
+Output_section_definition::get_output_section_info(const char* name,
+ uint64_t* address,
+ uint64_t* load_address,
+ uint64_t* addr_align,
+ uint64_t* size) const
+{
+ if (this->name_ != name)
+ return false;
+
+ if (this->output_section_ != NULL)
+ {
+ *address = this->output_section_->address();
+ if (this->output_section_->has_load_address())
+ *load_address = this->output_section_->load_address();
+ else
+ *load_address = *address;
+ *addr_align = this->output_section_->addralign();
+ *size = this->output_section_->current_data_size();
+ }
+ else
+ {
+ *address = this->evaluated_address_;
+ *load_address = this->evaluated_load_address_;
+ *addr_align = this->evaluated_addralign_;
+ *size = 0;
+ }
+
return true;
}
this->fill_->print(f);
}
+ if (this->phdrs_ != NULL)
+ {
+ for (String_list::const_iterator p = this->phdrs_->begin();
+ p != this->phdrs_->end();
+ ++p)
+ fprintf(f, " :%s", p->c_str());
+ }
+
fprintf(f, "\n");
}
: os_(os)
{ }
- // Return whether to place an orphan section after this one.
+ // Return whether the orphan output section is relro. We can just
+ // check the output section because we always set the flag, if
+ // needed, just after we create the Orphan_output_section.
bool
- place_orphan_here(const Output_section *os, bool* exact) const;
+ is_relro() const
+ { return this->os_->is_relro(); }
+
+ // Initialize OSP with an output section. This should have been
+ // done already.
+ void
+ orphan_section_init(Orphan_section_placement*,
+ Script_sections::Elements_iterator)
+ { gold_unreachable(); }
// Set section addresses.
void
- set_section_addresses(Symbol_table*, Layout*, bool*, uint64_t*);
+ set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*);
+
+ // Get the list of segments to use for an allocated section when
+ // using a PHDRS clause.
+ Output_section*
+ allocate_to_segment(String_list**, bool*);
+
+ // Return the associated Output_section.
+ Output_section*
+ get_output_section() const
+ { return this->os_; }
// Print for debugging.
void
Output_section* os_;
};
-// Whether to place another orphan section after this one.
-
-bool
-Orphan_output_section::place_orphan_here(const Output_section* os,
- bool* exact) const
-{
- if (this->os_->type() == os->type()
- && this->os_->flags() == os->flags())
- {
- *exact = true;
- return true;
- }
- return false;
-}
-
// Set section addresses.
void
Orphan_output_section::set_section_addresses(Symbol_table*, Layout*,
- bool* dot_has_value,
- uint64_t* dot_value)
+ uint64_t* dot_value,
+ uint64_t* load_address)
{
- typedef std::list<std::pair<Relobj*, unsigned int> > Input_section_list;
+ typedef std::list<Output_section::Simple_input_section> Input_section_list;
- if (!*dot_has_value)
- gold_error(_("no address for orphan section %s"), this->os_->name());
+ bool have_load_address = *load_address != *dot_value;
uint64_t address = *dot_value;
address = align_address(address, this->os_->addralign());
if ((this->os_->flags() & elfcpp::SHF_ALLOC) != 0)
- this->os_->set_address(address);
+ {
+ this->os_->set_address(address);
+ if (have_load_address)
+ this->os_->set_load_address(align_address(*load_address,
+ this->os_->addralign()));
+ }
Input_section_list input_sections;
address += this->os_->get_input_sections(address, "", &input_sections);
p != input_sections.end();
++p)
{
- uint64_t addralign;
+ uint64_t addr_align;
uint64_t size;
// We know what are single-threaded, so it is OK to lock the
// object.
{
const Task* task = reinterpret_cast<const Task*>(-1);
- Task_lock_obj<Object> tl(task, p->first);
- addralign = p->first->section_addralign(p->second);
- size = p->first->section_size(p->second);
+ Task_lock_obj<Object> tl(task, p->relobj());
+ addr_align = p->relobj()->section_addralign(p->shndx());
+ if (p->is_relaxed_input_section())
+ // We use current data size because relxed section sizes may not
+ // have finalized yet.
+ size = p->relaxed_input_section()->current_data_size();
+ else
+ size = p->relobj()->section_size(p->shndx());
}
- address = align_address(address, addralign);
- this->os_->add_input_section_for_script(p->first, p->second, size, 0);
+ address = align_address(address, addr_align);
+ this->os_->add_input_section_for_script(*p, size, addr_align);
address += size;
}
- *dot_value = address;
+ // An SHF_TLS/SHT_NOBITS section does not take up any address space.
+ if (this->os_ == NULL
+ || (this->os_->flags() & elfcpp::SHF_TLS) == 0
+ || this->os_->type() != elfcpp::SHT_NOBITS)
+ {
+ if (!have_load_address)
+ *load_address = address;
+ else
+ *load_address += address - *dot_value;
+
+ *dot_value = address;
+ }
+}
+
+// Get the list of segments to use for an allocated section when using
+// a PHDRS clause. If this is an allocated section, return the
+// Output_section. We don't change the list of segments.
+
+Output_section*
+Orphan_output_section::allocate_to_segment(String_list**, bool* orphan)
+{
+ if ((this->os_->flags() & elfcpp::SHF_ALLOC) == 0)
+ return NULL;
+ *orphan = true;
+ return this->os_;
+}
+
+// Class Phdrs_element. A program header from a PHDRS clause.
+
+class Phdrs_element
+{
+ public:
+ Phdrs_element(const char* aname, size_t namelen, unsigned int atype,
+ bool include_filehdr, bool include_phdrs,
+ bool is_flags_valid, unsigned int flags,
+ Expression* aload_address)
+ : name_(aname, namelen), type_(atype), includes_filehdr_(include_filehdr),
+ includes_phdrs_(include_phdrs), is_flags_valid_(is_flags_valid),
+ flags_(flags), load_address_(aload_address), load_address_value_(0),
+ segment_(NULL)
+ { }
+
+ // Return the name of this segment.
+ const std::string&
+ name() const
+ { return this->name_; }
+
+ // Return the type of the segment.
+ unsigned int
+ type() const
+ { return this->type_; }
+
+ // Whether to include the file header.
+ bool
+ includes_filehdr() const
+ { return this->includes_filehdr_; }
+
+ // Whether to include the program headers.
+ bool
+ includes_phdrs() const
+ { return this->includes_phdrs_; }
+
+ // Return whether there is a load address.
+ bool
+ has_load_address() const
+ { return this->load_address_ != NULL; }
+
+ // Evaluate the load address expression if there is one.
+ void
+ eval_load_address(Symbol_table* symtab, Layout* alayout)
+ {
+ if (this->load_address_ != NULL)
+ this->load_address_value_ = this->load_address_->eval(symtab, alayout,
+ true);
+ }
+
+ // Return the load address.
+ uint64_t
+ load_address() const
+ {
+ gold_assert(this->load_address_ != NULL);
+ return this->load_address_value_;
+ }
+
+ // Create the segment.
+ Output_segment*
+ create_segment(Layout* layout)
+ {
+ this->segment_ = layout->make_output_segment(this->type_, this->flags_);
+ return this->segment_;
+ }
+
+ // Return the segment.
+ Output_segment*
+ segment()
+ { return this->segment_; }
+
+ // Release the segment.
+ void
+ release_segment()
+ { this->segment_ = NULL; }
+
+ // Set the segment flags if appropriate.
+ void
+ set_flags_if_valid()
+ {
+ if (this->is_flags_valid_)
+ this->segment_->set_flags(this->flags_);
+ }
+
+ // Print for debugging.
+ void
+ print(FILE*) const;
+
+ private:
+ // The name used in the script.
+ std::string name_;
+ // The type of the segment (PT_LOAD, etc.).
+ unsigned int type_;
+ // Whether this segment includes the file header.
+ bool includes_filehdr_;
+ // Whether this segment includes the section headers.
+ bool includes_phdrs_;
+ // Whether the flags were explicitly specified.
+ bool is_flags_valid_;
+ // The flags for this segment (PF_R, etc.) if specified.
+ unsigned int flags_;
+ // The expression for the load address for this segment. This may
+ // be NULL.
+ Expression* load_address_;
+ // The actual load address from evaluating the expression.
+ uint64_t load_address_value_;
+ // The segment itself.
+ Output_segment* segment_;
+};
+
+// Print for debugging.
+
+void
+Phdrs_element::print(FILE* f) const
+{
+ fprintf(f, " %s 0x%x", this->name_.c_str(), this->type_);
+ if (this->includes_filehdr_)
+ fprintf(f, " FILEHDR");
+ if (this->includes_phdrs_)
+ fprintf(f, " PHDRS");
+ if (this->is_flags_valid_)
+ fprintf(f, " FLAGS(%u)", this->flags_);
+ if (this->load_address_ != NULL)
+ {
+ fprintf(f, " AT(");
+ this->load_address_->print(f);
+ fprintf(f, ")");
+ }
+ fprintf(f, ";\n");
}
// Class Script_sections.
: saw_sections_clause_(false),
in_sections_clause_(false),
sections_elements_(NULL),
- output_section_(NULL)
+ output_section_(NULL),
+ phdrs_elements_(NULL),
+ orphan_section_placement_(NULL),
+ data_segment_align_start_(),
+ saw_data_segment_align_(false),
+ saw_relro_end_(false),
+ saw_segment_start_expression_(false)
{
}
this->output_section_->add_dot_assignment(val);
else
{
+ // The GNU linker permits assignments to . to appears outside of
+ // a SECTIONS clause, and treats it as appearing inside, so
+ // sections_elements_ may be NULL here.
+ if (this->sections_elements_ == NULL)
+ {
+ this->sections_elements_ = new Sections_elements;
+ this->saw_sections_clause_ = true;
+ }
+
Sections_element* p = new Sections_element_dot_assignment(val);
this->sections_elements_->push_back(p);
}
this->output_section_->add_input_section(spec, keep);
}
+// This is called when we see DATA_SEGMENT_ALIGN. It means that any
+// subsequent output sections may be relro.
+
+void
+Script_sections::data_segment_align()
+{
+ if (this->saw_data_segment_align_)
+ gold_error(_("DATA_SEGMENT_ALIGN may only appear once in a linker script"));
+ gold_assert(!this->sections_elements_->empty());
+ Sections_elements::iterator p = this->sections_elements_->end();
+ --p;
+ this->data_segment_align_start_ = p;
+ this->saw_data_segment_align_ = true;
+}
+
+// This is called when we see DATA_SEGMENT_RELRO_END. It means that
+// any output sections seen since DATA_SEGMENT_ALIGN are relro.
+
+void
+Script_sections::data_segment_relro_end()
+{
+ if (this->saw_relro_end_)
+ gold_error(_("DATA_SEGMENT_RELRO_END may only appear once "
+ "in a linker script"));
+ this->saw_relro_end_ = true;
+
+ if (!this->saw_data_segment_align_)
+ gold_error(_("DATA_SEGMENT_RELRO_END must follow DATA_SEGMENT_ALIGN"));
+ else
+ {
+ Sections_elements::iterator p = this->data_segment_align_start_;
+ for (++p; p != this->sections_elements_->end(); ++p)
+ (*p)->set_is_relro();
+ }
+}
+
+// Create any required sections.
+
+void
+Script_sections::create_sections(Layout* layout)
+{
+ if (!this->saw_sections_clause_)
+ return;
+ for (Sections_elements::iterator p = this->sections_elements_->begin();
+ p != this->sections_elements_->end();
+ ++p)
+ (*p)->create_sections(layout);
+}
+
// Add any symbols we are defining to the symbol table.
void
{
if (!this->saw_sections_clause_)
return;
- bool dot_has_value = false;
uint64_t dot_value = 0;
for (Sections_elements::iterator p = this->sections_elements_->begin();
p != this->sections_elements_->end();
++p)
- (*p)->finalize_symbols(symtab, layout, &dot_has_value, &dot_value);
+ (*p)->finalize_symbols(symtab, layout, &dot_value);
}
// Return the name of the output section to use for an input file name
void
Script_sections::place_orphan(Output_section* os)
{
- // Look for an output section definition which matches the output
- // section. Put a marker after that section.
- Sections_elements::iterator place = this->sections_elements_->end();
- for (Sections_elements::iterator p = this->sections_elements_->begin();
- p != this->sections_elements_->end();
- ++p)
+ Orphan_section_placement* osp = this->orphan_section_placement_;
+ if (osp == NULL)
{
- bool exact;
- if ((*p)->place_orphan_here(os, &exact))
- {
- place = p;
- if (exact)
- break;
- }
+ // Initialize the Orphan_section_placement structure.
+ osp = new Orphan_section_placement();
+ for (Sections_elements::iterator p = this->sections_elements_->begin();
+ p != this->sections_elements_->end();
+ ++p)
+ (*p)->orphan_section_init(osp, p);
+ gold_assert(!this->sections_elements_->empty());
+ Sections_elements::iterator last = this->sections_elements_->end();
+ --last;
+ osp->last_init(last);
+ this->orphan_section_placement_ = osp;
}
- // The insert function puts the new element before the iterator.
- if (place != this->sections_elements_->end())
- ++place;
+ Orphan_output_section* orphan = new Orphan_output_section(os);
- this->sections_elements_->insert(place, new Orphan_output_section(os));
+ // Look for where to put ORPHAN.
+ Sections_elements::iterator* where;
+ if (osp->find_place(os, &where))
+ {
+ if ((**where)->is_relro())
+ os->set_is_relro();
+ else
+ os->clear_is_relro();
+
+ // We want to insert ORPHAN after *WHERE, and then update *WHERE
+ // so that the next one goes after this one.
+ Sections_elements::iterator p = *where;
+ gold_assert(p != this->sections_elements_->end());
+ ++p;
+ *where = this->sections_elements_->insert(p, orphan);
+ }
+ else
+ {
+ os->clear_is_relro();
+ // We don't have a place to put this orphan section. Put it,
+ // and all other sections like it, at the end, but before the
+ // sections which always come at the end.
+ Sections_elements::iterator last = osp->last_place();
+ *where = this->sections_elements_->insert(last, orphan);
+ }
}
// Set the addresses of all the output sections. Walk through all the
}
}
- bool dot_has_value = false;
+ // Force the alignment of the first TLS section to be the maximum
+ // alignment of all TLS sections.
+ Output_section* first_tls = NULL;
+ uint64_t tls_align = 0;
+ for (Sections_elements::const_iterator p = this->sections_elements_->begin();
+ p != this->sections_elements_->end();
+ ++p)
+ {
+ Output_section *os = (*p)->get_output_section();
+ if (os != NULL && (os->flags() & elfcpp::SHF_TLS) != 0)
+ {
+ if (first_tls == NULL)
+ first_tls = os;
+ if (os->addralign() > tls_align)
+ tls_align = os->addralign();
+ }
+ }
+ if (first_tls != NULL)
+ first_tls->set_addralign(tls_align);
+
+ // For a relocatable link, we implicitly set dot to zero.
uint64_t dot_value = 0;
+ uint64_t load_address = 0;
+
+ // Check to see if we want to use any of -Ttext, -Tdata and -Tbss options
+ // to set section addresses. If the script has any SEGMENT_START
+ // expression, we do not set the section addresses.
+ bool use_tsection_options =
+ (!this->saw_segment_start_expression_
+ && (parameters->options().user_set_Ttext()
+ || parameters->options().user_set_Tdata()
+ || parameters->options().user_set_Tbss()));
+
for (Sections_elements::iterator p = this->sections_elements_->begin();
p != this->sections_elements_->end();
++p)
- (*p)->set_section_addresses(symtab, layout, &dot_has_value, &dot_value);
+ {
+ Output_section* os = (*p)->get_output_section();
+
+ // Handle -Ttext, -Tdata and -Tbss options. We do this by looking for
+ // the special sections by names and doing dot assignments.
+ if (use_tsection_options
+ && os != NULL
+ && (os->flags() & elfcpp::SHF_ALLOC) != 0)
+ {
+ uint64_t new_dot_value = dot_value;
+
+ if (parameters->options().user_set_Ttext()
+ && strcmp(os->name(), ".text") == 0)
+ new_dot_value = parameters->options().Ttext();
+ else if (parameters->options().user_set_Tdata()
+ && strcmp(os->name(), ".data") == 0)
+ new_dot_value = parameters->options().Tdata();
+ else if (parameters->options().user_set_Tbss()
+ && strcmp(os->name(), ".bss") == 0)
+ new_dot_value = parameters->options().Tbss();
+
+ // Update dot and load address if necessary.
+ if (new_dot_value < dot_value)
+ gold_error(_("dot may not move backward"));
+ else if (new_dot_value != dot_value)
+ {
+ dot_value = new_dot_value;
+ load_address = new_dot_value;
+ }
+ }
+
+ (*p)->set_section_addresses(symtab, layout, &dot_value, &load_address);
+ }
+
+ if (this->phdrs_elements_ != NULL)
+ {
+ for (Phdrs_elements::iterator p = this->phdrs_elements_->begin();
+ p != this->phdrs_elements_->end();
+ ++p)
+ (*p)->eval_load_address(symtab, layout);
+ }
return this->create_segments(layout);
}
&& (os->flags() & elfcpp::SHF_TLS) == 0);
}
+// Return the size taken by the file header and the program headers.
+
+size_t
+Script_sections::total_header_size(Layout* layout) const
+{
+ size_t segment_count = layout->segment_count();
+ size_t file_header_size;
+ size_t segment_headers_size;
+ if (parameters->target().get_size() == 32)
+ {
+ file_header_size = elfcpp::Elf_sizes<32>::ehdr_size;
+ segment_headers_size = segment_count * elfcpp::Elf_sizes<32>::phdr_size;
+ }
+ else if (parameters->target().get_size() == 64)
+ {
+ file_header_size = elfcpp::Elf_sizes<64>::ehdr_size;
+ segment_headers_size = segment_count * elfcpp::Elf_sizes<64>::phdr_size;
+ }
+ else
+ gold_unreachable();
+
+ return file_header_size + segment_headers_size;
+}
+
+// Return the amount we have to subtract from the LMA to accomodate
+// headers of the given size. The complication is that the file
+// header have to be at the start of a page, as otherwise it will not
+// be at the start of the file.
+
+uint64_t
+Script_sections::header_size_adjustment(uint64_t lma,
+ size_t sizeof_headers) const
+{
+ const uint64_t abi_pagesize = parameters->target().abi_pagesize();
+ uint64_t hdr_lma = lma - sizeof_headers;
+ hdr_lma &= ~(abi_pagesize - 1);
+ return lma - hdr_lma;
+}
+
// Create the PT_LOAD segments when using a SECTIONS clause. Returns
// the segment which should hold the file header and segment headers,
// if any.
{
gold_assert(this->saw_sections_clause_);
- if (parameters->output_is_object())
+ if (parameters->options().relocatable())
return NULL;
+ if (this->saw_phdrs_clause())
+ return create_segments_from_phdrs_clause(layout);
+
Layout::Section_list sections;
layout->get_allocated_sections(§ions);
this->create_note_and_tls_segments(layout, §ions);
// Walk through the sections adding them to PT_LOAD segments.
- const uint64_t abi_pagesize = parameters->target()->abi_pagesize();
+ const uint64_t abi_pagesize = parameters->target().abi_pagesize();
Output_segment* first_seg = NULL;
Output_segment* current_seg = NULL;
bool is_current_seg_readonly = true;
need_new_segment = true;
}
else if (is_current_seg_readonly
- && ((*p)->flags() & elfcpp::SHF_WRITE) != 0)
+ && ((*p)->flags() & elfcpp::SHF_WRITE) != 0
+ && !parameters->options().omagic())
{
// Don't put a writable section in the same segment as a
// non-writable section.
is_current_seg_readonly = true;
}
- current_seg->add_output_section(*p, seg_flags);
+ current_seg->add_output_section(*p, seg_flags, false);
if (((*p)->flags() & elfcpp::SHF_WRITE) != 0)
is_current_seg_readonly = false;
// efficient in any case. We try to use the first PT_LOAD segment
// if we can, otherwise we make a new one.
- size_t segment_count = layout->segment_count();
- size_t file_header_size;
- size_t segment_headers_size;
- if (parameters->get_size() == 32)
- {
- file_header_size = elfcpp::Elf_sizes<32>::ehdr_size;
- segment_headers_size = segment_count * elfcpp::Elf_sizes<32>::phdr_size;
- }
- else if (parameters->get_size() == 64)
- {
- file_header_size = elfcpp::Elf_sizes<64>::ehdr_size;
- segment_headers_size = segment_count * elfcpp::Elf_sizes<64>::phdr_size;
- }
- else
- gold_unreachable();
+ if (first_seg == NULL)
+ return NULL;
+
+ // -n or -N mean that the program is not demand paged and there is
+ // no need to put the program headers in a PT_LOAD segment.
+ if (parameters->options().nmagic() || parameters->options().omagic())
+ return NULL;
+
+ size_t sizeof_headers = this->total_header_size(layout);
+
+ uint64_t vma = first_seg->vaddr();
+ uint64_t lma = first_seg->paddr();
- size_t sizeof_headers = file_header_size + segment_headers_size;
+ uint64_t subtract = this->header_size_adjustment(lma, sizeof_headers);
- if (first_seg != NULL
- && (first_seg->paddr() & (abi_pagesize - 1)) >= sizeof_headers)
+ if ((lma & (abi_pagesize - 1)) >= sizeof_headers)
{
- first_seg->set_addresses(first_seg->vaddr() - sizeof_headers,
- first_seg->paddr() - sizeof_headers);
+ first_seg->set_addresses(vma - subtract, lma - subtract);
return first_seg;
}
+ // If there is no room to squeeze in the headers, then punt. The
+ // resulting executable probably won't run on GNU/Linux, but we
+ // trust that the user knows what they are doing.
+ if (lma < subtract || vma < subtract)
+ return NULL;
+
Output_segment* load_seg = layout->make_output_segment(elfcpp::PT_LOAD,
elfcpp::PF_R);
- if (first_seg == NULL)
- load_seg->set_addresses(0, 0);
- else
- {
- uint64_t vma = first_seg->vaddr();
- uint64_t lma = first_seg->paddr();
-
- // We want a segment with the same relationship between VMA and
- // LMA, but with enough room for the headers, and aligned to
- // load at the start of a page.
- uint64_t hdr_lma = lma - sizeof_headers;
- hdr_lma &= ~(abi_pagesize - 1);
- if (lma >= hdr_lma && vma >= (lma - hdr_lma))
- load_seg->set_addresses(vma - (lma - hdr_lma), hdr_lma);
- else
- {
- // We could handle this case by create the file header
- // outside of any PT_LOAD segment, and creating a new
- // PT_LOAD segment after the others to hold the segment
- // headers.
- gold_error(_("sections loaded on first page without room for "
- "file and program headers are not supported"));
- }
- }
+ load_seg->set_addresses(vma - subtract, lma - subtract);
return load_seg;
}
Layout* layout,
const Layout::Section_list* sections)
{
+ gold_assert(!this->saw_phdrs_clause());
+
bool saw_tls = false;
for (Layout::Section_list::const_iterator p = sections->begin();
p != sections->end();
Layout::section_flags_to_segment((*p)->flags());
Output_segment* oseg = layout->make_output_segment(elfcpp::PT_NOTE,
seg_flags);
- oseg->add_output_section(*p, seg_flags);
+ oseg->add_output_section(*p, seg_flags, false);
// Incorporate any subsequent SHT_NOTE sections, in the
// hopes that the script is sensible.
&& (*pnext)->type() == elfcpp::SHT_NOTE)
{
seg_flags = Layout::section_flags_to_segment((*pnext)->flags());
- oseg->add_output_section(*pnext, seg_flags);
+ oseg->add_output_section(*pnext, seg_flags, false);
p = pnext;
++pnext;
}
Layout::section_flags_to_segment((*p)->flags());
Output_segment* oseg = layout->make_output_segment(elfcpp::PT_TLS,
seg_flags);
- oseg->add_output_section(*p, seg_flags);
+ oseg->add_output_section(*p, seg_flags, false);
Layout::Section_list::const_iterator pnext = p + 1;
while (pnext != sections->end()
&& ((*pnext)->flags() & elfcpp::SHF_TLS) != 0)
{
seg_flags = Layout::section_flags_to_segment((*pnext)->flags());
- oseg->add_output_section(*pnext, seg_flags);
+ oseg->add_output_section(*pnext, seg_flags, false);
p = pnext;
++pnext;
}
}
}
+// Add a program header. The PHDRS clause is syntactically distinct
+// from the SECTIONS clause, but we implement it with the SECTIONS
+// support because PHDRS is useless if there is no SECTIONS clause.
+
+void
+Script_sections::add_phdr(const char* name, size_t namelen, unsigned int type,
+ bool includes_filehdr, bool includes_phdrs,
+ bool is_flags_valid, unsigned int flags,
+ Expression* load_address)
+{
+ if (this->phdrs_elements_ == NULL)
+ this->phdrs_elements_ = new Phdrs_elements();
+ this->phdrs_elements_->push_back(new Phdrs_element(name, namelen, type,
+ includes_filehdr,
+ includes_phdrs,
+ is_flags_valid, flags,
+ load_address));
+}
+
// Return the number of segments we expect to create based on the
// SECTIONS clause. This is used to implement SIZEOF_HEADERS.
size_t
Script_sections::expected_segment_count(const Layout* layout) const
{
+ if (this->saw_phdrs_clause())
+ return this->phdrs_elements_->size();
+
Layout::Section_list sections;
layout->get_allocated_sections(§ions);
return ret;
}
+// Create the segments from a PHDRS clause. Return the segment which
+// should hold the file header and program headers, if any.
+
+Output_segment*
+Script_sections::create_segments_from_phdrs_clause(Layout* layout)
+{
+ this->attach_sections_using_phdrs_clause(layout);
+ return this->set_phdrs_clause_addresses(layout);
+}
+
+// Create the segments from the PHDRS clause, and put the output
+// sections in them.
+
+void
+Script_sections::attach_sections_using_phdrs_clause(Layout* layout)
+{
+ typedef std::map<std::string, Output_segment*> Name_to_segment;
+ Name_to_segment name_to_segment;
+ for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin();
+ p != this->phdrs_elements_->end();
+ ++p)
+ name_to_segment[(*p)->name()] = (*p)->create_segment(layout);
+
+ // Walk through the output sections and attach them to segments.
+ // Output sections in the script which do not list segments are
+ // attached to the same set of segments as the immediately preceding
+ // output section.
+
+ String_list* phdr_names = NULL;
+ bool load_segments_only = false;
+ for (Sections_elements::const_iterator p = this->sections_elements_->begin();
+ p != this->sections_elements_->end();
+ ++p)
+ {
+ bool orphan;
+ String_list* old_phdr_names = phdr_names;
+ Output_section* os = (*p)->allocate_to_segment(&phdr_names, &orphan);
+ if (os == NULL)
+ continue;
+
+ if (phdr_names == NULL)
+ {
+ gold_error(_("allocated section not in any segment"));
+ continue;
+ }
+
+ // We see a list of segments names. Disable PT_LOAD segment only
+ // filtering.
+ if (old_phdr_names != phdr_names)
+ load_segments_only = false;
+
+ // If this is an orphan section--one that was not explicitly
+ // mentioned in the linker script--then it should not inherit
+ // any segment type other than PT_LOAD. Otherwise, e.g., the
+ // PT_INTERP segment will pick up following orphan sections,
+ // which does not make sense. If this is not an orphan section,
+ // we trust the linker script.
+ if (orphan)
+ {
+ // Enable PT_LOAD segments only filtering until we see another
+ // list of segment names.
+ load_segments_only = true;
+ }
+
+ bool in_load_segment = false;
+ for (String_list::const_iterator q = phdr_names->begin();
+ q != phdr_names->end();
+ ++q)
+ {
+ Name_to_segment::const_iterator r = name_to_segment.find(*q);
+ if (r == name_to_segment.end())
+ gold_error(_("no segment %s"), q->c_str());
+ else
+ {
+ if (load_segments_only
+ && r->second->type() != elfcpp::PT_LOAD)
+ continue;
+
+ elfcpp::Elf_Word seg_flags =
+ Layout::section_flags_to_segment(os->flags());
+ r->second->add_output_section(os, seg_flags, false);
+
+ if (r->second->type() == elfcpp::PT_LOAD)
+ {
+ if (in_load_segment)
+ gold_error(_("section in two PT_LOAD segments"));
+ in_load_segment = true;
+ }
+ }
+ }
+
+ if (!in_load_segment)
+ gold_error(_("allocated section not in any PT_LOAD segment"));
+ }
+}
+
+// Set the addresses for segments created from a PHDRS clause. Return
+// the segment which should hold the file header and program headers,
+// if any.
+
+Output_segment*
+Script_sections::set_phdrs_clause_addresses(Layout* layout)
+{
+ Output_segment* load_seg = NULL;
+ for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin();
+ p != this->phdrs_elements_->end();
+ ++p)
+ {
+ // Note that we have to set the flags after adding the output
+ // sections to the segment, as adding an output segment can
+ // change the flags.
+ (*p)->set_flags_if_valid();
+
+ Output_segment* oseg = (*p)->segment();
+
+ if (oseg->type() != elfcpp::PT_LOAD)
+ {
+ // The addresses of non-PT_LOAD segments are set from the
+ // PT_LOAD segments.
+ if ((*p)->has_load_address())
+ gold_error(_("may only specify load address for PT_LOAD segment"));
+ continue;
+ }
+
+ // The output sections should have addresses from the SECTIONS
+ // clause. The addresses don't have to be in order, so find the
+ // one with the lowest load address. Use that to set the
+ // address of the segment.
+
+ Output_section* osec = oseg->section_with_lowest_load_address();
+ if (osec == NULL)
+ {
+ oseg->set_addresses(0, 0);
+ continue;
+ }
+
+ uint64_t vma = osec->address();
+ uint64_t lma = osec->has_load_address() ? osec->load_address() : vma;
+
+ // Override the load address of the section with the load
+ // address specified for the segment.
+ if ((*p)->has_load_address())
+ {
+ if (osec->has_load_address())
+ gold_warning(_("PHDRS load address overrides "
+ "section %s load address"),
+ osec->name());
+
+ lma = (*p)->load_address();
+ }
+
+ bool headers = (*p)->includes_filehdr() && (*p)->includes_phdrs();
+ if (!headers && ((*p)->includes_filehdr() || (*p)->includes_phdrs()))
+ {
+ // We could support this if we wanted to.
+ gold_error(_("using only one of FILEHDR and PHDRS is "
+ "not currently supported"));
+ }
+ if (headers)
+ {
+ size_t sizeof_headers = this->total_header_size(layout);
+ uint64_t subtract = this->header_size_adjustment(lma,
+ sizeof_headers);
+ if (lma >= subtract && vma >= subtract)
+ {
+ lma -= subtract;
+ vma -= subtract;
+ }
+ else
+ {
+ gold_error(_("sections loaded on first page without room "
+ "for file and program headers "
+ "are not supported"));
+ }
+
+ if (load_seg != NULL)
+ gold_error(_("using FILEHDR and PHDRS on more than one "
+ "PT_LOAD segment is not currently supported"));
+ load_seg = oseg;
+ }
+
+ oseg->set_addresses(vma, lma);
+ }
+
+ return load_seg;
+}
+
+// Add the file header and segment headers to non-load segments
+// specified in the PHDRS clause.
+
+void
+Script_sections::put_headers_in_phdrs(Output_data* file_header,
+ Output_data* segment_headers)
+{
+ gold_assert(this->saw_phdrs_clause());
+ for (Phdrs_elements::iterator p = this->phdrs_elements_->begin();
+ p != this->phdrs_elements_->end();
+ ++p)
+ {
+ if ((*p)->type() != elfcpp::PT_LOAD)
+ {
+ if ((*p)->includes_phdrs())
+ (*p)->segment()->add_initial_output_data(segment_headers);
+ if ((*p)->includes_filehdr())
+ (*p)->segment()->add_initial_output_data(file_header);
+ }
+ }
+}
+
+// Look for an output section by name and return the address, the load
+// address, the alignment, and the size. This is used when an
+// expression refers to an output section which was not actually
+// created. This returns true if the section was found, false
+// otherwise.
+
+bool
+Script_sections::get_output_section_info(const char* name, uint64_t* address,
+ uint64_t* load_address,
+ uint64_t* addr_align,
+ uint64_t* size) const
+{
+ if (!this->saw_sections_clause_)
+ return false;
+ for (Sections_elements::const_iterator p = this->sections_elements_->begin();
+ p != this->sections_elements_->end();
+ ++p)
+ if ((*p)->get_output_section_info(name, address, load_address, addr_align,
+ size))
+ return true;
+ return false;
+}
+
+// Release all Output_segments. This remove all pointers to all
+// Output_segments.
+
+void
+Script_sections::release_segments()
+{
+ if (this->saw_phdrs_clause())
+ {
+ for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin();
+ p != this->phdrs_elements_->end();
+ ++p)
+ (*p)->release_segment();
+ }
+}
+
// Print the SECTIONS clause to F for debugging.
void
(*p)->print(f);
fprintf(f, "}\n");
+
+ if (this->phdrs_elements_ != NULL)
+ {
+ fprintf(f, "PHDRS {\n");
+ for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin();
+ p != this->phdrs_elements_->end();
+ ++p)
+ (*p)->print(f);
+ fprintf(f, "}\n");
+ }
}
} // End namespace gold.