// script-sections.cc -- linker script SECTIONS for gold
-// Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+// Copyright (C) 2008-2016 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
script_exp_binary_add(this->start_,
script_exp_integer(this->current_offset_));
}
-
+
+ void
+ set_address(uint64_t addr, const Symbol_table* symtab, const Layout* layout)
+ {
+ uint64_t start = this->start_->eval(symtab, layout, false);
+ uint64_t len = this->length_->eval(symtab, layout, false);
+ if (addr < start || addr >= start + len)
+ gold_error(_("address 0x%llx is not within region %s"),
+ static_cast<unsigned long long>(addr),
+ this->name_.c_str());
+ else if (addr < start + this->current_offset_)
+ gold_error(_("address 0x%llx moves dot backwards in region %s"),
+ static_cast<unsigned long long>(addr),
+ this->name_.c_str());
+ this->current_offset_ = addr - start;
+ }
+
void
increment_offset(std::string section_name, uint64_t amount,
const Symbol_table* symtab, const Layout* layout)
gold_error(_("section %s overflows end of region %s"),
section_name.c_str(), this->name_.c_str());
}
-
+
// Returns true iff there is room left in this region
// for AMOUNT more bytes of data.
bool
// are compatible with this region's attributes.
bool
attributes_compatible(elfcpp::Elf_Xword flags, elfcpp::Elf_Xword type) const;
-
+
void
add_section(Output_section_definition* sec, bool vma)
{
// Output_section_definition.
virtual const char*
output_section_name(const char*, const char*, Output_section***,
- Script_sections::Section_type*)
+ Script_sections::Section_type*, bool*)
{ return NULL; }
// Initialize OSP with an output section.
set_section_addresses(Symbol_table* symtab, Layout* layout,
uint64_t* dot_value, uint64_t*, uint64_t*)
{
- this->assignment_.set_if_absolute(symtab, layout, true, *dot_value);
+ this->assignment_.set_if_absolute(symtab, layout, true, *dot_value, NULL);
}
// Print for debugging.
// output section definition the dot symbol is always considered
// to be absolute.
*dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, false);
}
// Update the dot symbol while setting section addresses.
uint64_t* load_address)
{
*dot_value = this->val_->eval_with_dot(symtab, layout, false, *dot_value,
- NULL, NULL, dot_alignment);
+ NULL, NULL, dot_alignment, false);
*load_address = *dot_value;
}
// Return whether this element matches FILE_NAME and SECTION_NAME.
// The only real implementation is in Output_section_element_input.
virtual bool
- match_name(const char*, const char*) const
+ match_name(const char*, const char*, bool *) const
{ return false; }
// Set section addresses. This includes applying assignments if the
void
set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*,
uint64_t, uint64_t* dot_value, uint64_t*,
- Output_section**, std::string*, Input_section_list*)
+ Output_section** dot_section, std::string*,
+ Input_section_list*)
{
- this->assignment_.set_if_absolute(symtab, layout, true, *dot_value);
+ this->assignment_.set_if_absolute(symtab, layout, true, *dot_value,
+ *dot_section);
}
// Print for debugging.
: val_(val)
{ }
+ // An assignment to dot within an output section is enough to force
+ // the output section to exist.
+ bool
+ needs_output_section() const
+ { return true; }
+
// Finalize the symbol.
void
finalize_symbols(Symbol_table* symtab, const Layout* layout,
uint64_t* dot_value, Output_section** dot_section)
{
*dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value,
- *dot_section, dot_section, NULL);
+ *dot_section, dot_section, NULL,
+ true);
}
// 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, uint64_t*,
- Output_section**, std::string*, Input_section_list*);
+ Output_section** dot_section, std::string*,
+ Input_section_list*);
// Print for debugging.
void
{
uint64_t next_dot = this->val_->eval_with_dot(symtab, layout, false,
*dot_value, *dot_section,
- dot_section, dot_alignment);
+ dot_section, dot_alignment,
+ true);
if (next_dot < *dot_value)
gold_error(_("dot may not move backward"));
if (next_dot > *dot_value && output_section != NULL)
{
uint64_t val = this->val_->eval_with_dot(this->symtab_, this->layout_,
true, this->dot_value_,
- this->dot_section_, NULL, NULL);
+ this->dot_section_, NULL, NULL,
+ false);
if (parameters->target().is_big_endian())
this->endian_write_to_buffer<true>(val, buf);
Output_section* fill_section;
uint64_t fill_val = this->val_->eval_with_dot(symtab, layout, false,
*dot_value, *dot_section,
- &fill_section, NULL);
+ &fill_section, NULL, false);
if (fill_section != NULL)
gold_warning(_("fill value is not absolute"));
// FIXME: The GNU linker supports fill values of arbitrary length.
*dot_section = this->final_dot_section_;
}
- // See whether we match FILE_NAME and SECTION_NAME as an input
- // section.
+ // See whether we match FILE_NAME and SECTION_NAME as an input section.
+ // If we do then also indicate whether the section should be KEPT.
bool
- match_name(const char* file_name, const char* section_name) const;
+ match_name(const char* file_name, const char* section_name, bool* keep) const;
// Set the section address.
void
return true;
}
-// See whether we match FILE_NAME and SECTION_NAME.
+// See whether we match FILE_NAME and SECTION_NAME. If we do then
+// KEEP indicates whether the section should survive garbage collection.
bool
Output_section_element_input::match_name(const char* file_name,
- const char* section_name) const
+ const char* section_name,
+ bool *keep) const
{
if (!this->match_file_name(file_name))
return false;
+ *keep = this->keep_;
+
// If there are no section name patterns, then we match.
if (this->input_section_patterns_.empty())
return true;
// Set the section name.
void
set_section_name(const std::string name)
- { this->section_name_ = name; }
+ {
+ if (is_compressed_debug_section(name.c_str()))
+ this->section_name_ = corresponding_uncompressed_section_name(name);
+ else
+ this->section_name_ = name;
+ }
// Return the section size.
uint64_t
// We build a list of sections which match each
// Input_section_pattern.
+ // If none of the patterns specify a sort option, we throw all
+ // matching input sections into a single bin, in the order we
+ // find them. Otherwise, we put matching input sections into
+ // a separate bin for each pattern, and sort each one as
+ // specified. Thus, an input section spec like this:
+ // *(.foo .bar)
+ // will group all .foo and .bar sections in the order seen,
+ // whereas this:
+ // *(.foo) *(.bar)
+ // will group all .foo sections followed by all .bar sections.
+ // This matches Gnu ld behavior.
+
+ // Things get really weird, though, when you add a sort spec
+ // on some, but not all, of the patterns, like this:
+ // *(SORT_BY_NAME(.foo) .bar)
+ // We do not attempt to match Gnu ld behavior in this case.
+
typedef std::vector<std::vector<Input_section_info> > Matching_sections;
size_t input_pattern_count = this->input_section_patterns_.size();
- if (input_pattern_count == 0)
+ bool any_patterns_with_sort = false;
+ for (size_t i = 0; i < input_pattern_count; ++i)
+ {
+ const Input_section_pattern& isp(this->input_section_patterns_[i]);
+ if (isp.sort != SORT_WILDCARD_NONE)
+ any_patterns_with_sort = true;
+ }
+ if (input_pattern_count == 0 || !any_patterns_with_sort)
input_pattern_count = 1;
Matching_sections matching_sections(input_pattern_count);
++p;
else
{
+ if (!any_patterns_with_sort)
+ i = 0;
matching_sections[i].push_back(isi);
p = input_sections->erase(p);
}
// section name.
const char*
output_section_name(const char* file_name, const char* section_name,
- Output_section***, Script_sections::Section_type*);
+ Output_section***, Script_sections::Section_type*,
+ bool*);
// Initialize OSP with an output section.
void
{
address = this->address_->eval_with_dot(symtab, layout, true,
*dot_value, NULL,
- NULL, NULL);
+ NULL, NULL, false);
}
if (this->align_ != NULL)
{
uint64_t align = this->align_->eval_with_dot(symtab, layout, true,
*dot_value, NULL,
- NULL, NULL);
+ NULL, NULL, false);
address = align_address(address, align);
}
*dot_value = address;
const char* file_name,
const char* section_name,
Output_section*** slot,
- Script_sections::Section_type* psection_type)
+ Script_sections::Section_type* psection_type,
+ bool* keep)
{
// Ask each element whether it matches NAME.
for (Output_section_elements::const_iterator p = this->elements_.begin();
p != this->elements_.end();
++p)
{
- if ((*p)->match_name(file_name, section_name))
+ if ((*p)->match_name(file_name, section_name, keep))
{
// We found a match for NAME, which means that it should go
// into this output section.
Script_sections::find_memory_region(
Output_section_definition* section,
bool find_vma_region,
+ bool explicit_only,
Output_section_definition** previous_section_return)
{
if (previous_section_return != NULL)
}
}
- // Make a note of the first memory region whose attributes
- // are compatible with the section. If we do not find an
- // explicit region assignment, then we will return this region.
- Output_section* out_sec = section->get_output_section();
- if (first_match == NULL
- && out_sec != NULL
- && (*mr)->attributes_compatible(out_sec->flags(),
- out_sec->type()))
- first_match = *mr;
+ if (!explicit_only)
+ {
+ // Make a note of the first memory region whose attributes
+ // are compatible with the section. If we do not find an
+ // explicit region assignment, then we will return this region.
+ Output_section* out_sec = section->get_output_section();
+ if (first_match == NULL
+ && out_sec != NULL
+ && (*mr)->attributes_compatible(out_sec->flags(),
+ out_sec->type()))
+ first_match = *mr;
+ }
}
// With LMA computations, if an explicit region has not been specified then
uint64_t old_dot_value = *dot_value;
uint64_t old_load_address = *load_address;
+ // If input section sorting is requested via --section-ordering-file or
+ // linker plugins, then do it here. This is important because we want
+ // any sorting specified in the linker scripts, which will be done after
+ // this, to take precedence. The final order of input sections is then
+ // guaranteed to be according to the linker script specification.
+ if (this->output_section_ != NULL
+ && this->output_section_->input_section_order_specified())
+ this->output_section_->sort_attached_input_sections();
+
// Decide the start address for the section. The algorithm is:
// 1) If an address has been specified in a linker script, use that.
// 2) Otherwise if a memory region has been specified for the section,
;
else if (this->address_ == NULL)
{
- vma_region = script_sections->find_memory_region(this, true, NULL);
-
+ vma_region = script_sections->find_memory_region(this, true, false, NULL);
if (vma_region != NULL)
address = vma_region->get_current_address()->eval(symtab, layout,
false);
address = *dot_value;
}
else
- address = this->address_->eval_with_dot(symtab, layout, true,
- *dot_value, NULL, NULL,
- dot_alignment);
+ {
+ vma_region = script_sections->find_memory_region(this, true, true, NULL);
+ address = this->address_->eval_with_dot(symtab, layout, true,
+ *dot_value, NULL, NULL,
+ dot_alignment, false);
+ if (vma_region != NULL)
+ vma_region->set_address(address, symtab, layout);
+ }
+
uint64_t align;
if (this->align_ == NULL)
{
{
Output_section* align_section;
align = this->align_->eval_with_dot(symtab, layout, true, *dot_value,
- NULL, &align_section, NULL);
+ NULL, &align_section, NULL, false);
if (align_section != NULL)
gold_warning(_("alignment of section %s is not absolute"),
this->name_.c_str());
Output_section_definition* previous_section;
// Determine if an LMA region has been set for this section.
- lma_region = script_sections->find_memory_region(this, false,
+ lma_region = script_sections->find_memory_region(this, false, false,
&previous_section);
if (lma_region != NULL)
laddr = this->load_address_->eval_with_dot(symtab, layout, true,
*dot_value,
this->output_section_,
- NULL, NULL);
+ NULL, NULL, false);
if (this->output_section_ != NULL)
this->output_section_->set_load_address(laddr);
}
Output_section* subalign_section;
subalign = this->subalign_->eval_with_dot(symtab, layout, true,
*dot_value, NULL,
- &subalign_section, NULL);
+ &subalign_section, NULL,
+ false);
if (subalign_section != NULL)
gold_warning(_("subalign of section %s is not absolute"),
this->name_.c_str());
uint64_t fill_val = this->fill_->eval_with_dot(symtab, layout, true,
*dot_value,
NULL, &fill_section,
- NULL);
+ NULL, false);
if (fill_section != NULL)
gold_warning(_("fill of section %s is not absolute"),
this->name_.c_str());
uint64_t address = *dot_value;
address = align_address(address, this->os_->addralign());
+ // If input section sorting is requested via --section-ordering-file or
+ // linker plugins, then do it here. This is important because we want
+ // any sorting specified in the linker scripts, which will be done after
+ // this, to take precedence. The final order of input sections is then
+ // guaranteed to be according to the linker script specification.
+ if (this->os_ != NULL
+ && this->os_->input_section_order_specified())
+ this->os_->sort_attached_input_sections();
+
// For a relocatable link, all orphan sections are put at
// address 0. In general we expect all sections to be at
// address 0 for a relocatable link, but we permit the linker
address += size;
}
- // 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 (parameters->options().relocatable())
+ {
+ // For a relocatable link, reset DOT_VALUE to 0.
+ *dot_value = 0;
+ *load_address = 0;
+ }
+ else if (this->os_ == NULL
+ || (this->os_->flags() & elfcpp::SHF_TLS) == 0
+ || this->os_->type() != elfcpp::SHT_NOBITS)
{
+ // An SHF_TLS/SHT_NOBITS section does not take up any address space.
if (!have_load_address)
*load_address = address;
else
data_segment_align_start_(),
saw_data_segment_align_(false),
saw_relro_end_(false),
- saw_segment_start_expression_(false)
+ saw_segment_start_expression_(false),
+ segments_created_(false)
{
}
const char* file_name,
const char* section_name,
Output_section*** output_section_slot,
- Script_sections::Section_type* psection_type)
+ Script_sections::Section_type* psection_type,
+ bool* keep)
{
for (Sections_elements::const_iterator p = this->sections_elements_->begin();
p != this->sections_elements_->end();
{
const char* ret = (*p)->output_section_name(file_name, section_name,
output_section_slot,
- psection_type);
+ psection_type, keep);
if (ret != NULL)
{
saw_tls = true;
}
- // If we are making a shared library, and we see a section named
- // .interp, and the -dynamic-linker option was not used, then
- // put the .interp section in a PT_INTERP segment. This is for
- // GNU ld compatibility.
- if (strcmp((*p)->name(), ".interp") == 0
- && parameters->options().shared()
- && parameters->options().dynamic_linker() == NULL)
+ // If we see a section named .interp then put the .interp section
+ // in a PT_INTERP segment.
+ // This is for GNU ld compatibility.
+ if (strcmp((*p)->name(), ".interp") == 0)
{
elfcpp::Elf_Word seg_flags =
Layout::section_flags_to_segment((*p)->flags());
oseg->add_output_section_to_nonload(*p, seg_flags);
}
}
+
+ this->segments_created_ = true;
}
// Add a program header. The PHDRS clause is syntactically distinct
size_t
Script_sections::expected_segment_count(const Layout* layout) const
{
+ // If we've already created the segments, we won't be adding any more.
+ if (this->segments_created_)
+ return 0;
+
if (this->saw_phdrs_clause())
return this->phdrs_elements_->size();
bool saw_note = false;
bool saw_tls = false;
+ bool saw_interp = false;
for (Layout::Section_list::const_iterator p = sections.begin();
p != sections.end();
++p)
saw_tls = true;
}
}
+ else if (strcmp((*p)->name(), ".interp") == 0)
+ {
+ // There can only be one PT_INTERP segment.
+ if (!saw_interp)
+ {
+ ++ret;
+ saw_interp = true;
+ }
+ }
}
return ret;
p != this->phdrs_elements_->end();
++p)
name_to_segment[(*p)->name()] = (*p)->create_segment(layout);
+ this->segments_created_ = true;
// Walk through the output sections and attach them to segments.
// Output sections in the script which do not list segments are
p != this->sections_elements_->end();
++p)
{
- bool orphan;
+ bool is_orphan;
String_list* old_phdr_names = phdr_names;
- Output_section* os = (*p)->allocate_to_segment(&phdr_names, &orphan);
+ Output_section* os = (*p)->allocate_to_segment(&phdr_names, &is_orphan);
if (os == NULL)
continue;
+ elfcpp::Elf_Word seg_flags =
+ Layout::section_flags_to_segment(os->flags());
+
if (phdr_names == NULL)
{
- gold_error(_("allocated section not in any segment"));
+ // Don't worry about empty orphan sections.
+ if (is_orphan && os->current_data_size() > 0)
+ gold_error(_("allocated section %s not in any segment"),
+ os->name());
+
+ // To avoid later crashes drop this section into the first
+ // PT_LOAD segment.
+ for (Phdrs_elements::const_iterator ppe =
+ this->phdrs_elements_->begin();
+ ppe != this->phdrs_elements_->end();
+ ++ppe)
+ {
+ Output_segment* oseg = (*ppe)->segment();
+ if (oseg->type() == elfcpp::PT_LOAD)
+ {
+ oseg->add_output_section_to_load(layout, os, seg_flags);
+ break;
+ }
+ }
+
continue;
}
// 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)
+ if (is_orphan)
{
// Enable PT_LOAD segments only filtering until we see another
// list of segment names.
&& r->second->type() != elfcpp::PT_LOAD)
continue;
- elfcpp::Elf_Word seg_flags =
- Layout::section_flags_to_segment(os->flags());
-
if (r->second->type() != elfcpp::PT_LOAD)
r->second->add_output_section_to_nonload(os, seg_flags);
else
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