| // script-sections.cc -- linker script SECTIONS for gold |
| |
| // Copyright (C) 2008-2021 Free Software Foundation, Inc. |
| // Written by Ian Lance Taylor <iant@google.com>. |
| |
| // This file is part of gold. |
| |
| // This program is free software; you can redistribute it and/or modify |
| // it under the terms of the GNU General Public License as published by |
| // the Free Software Foundation; either version 3 of the License, or |
| // (at your option) any later version. |
| |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License |
| // along with this program; if not, write to the Free Software |
| // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| // MA 02110-1301, USA. |
| |
| #include "gold.h" |
| |
| #include <cstring> |
| #include <algorithm> |
| #include <list> |
| #include <map> |
| #include <string> |
| #include <vector> |
| #include <fnmatch.h> |
| |
| #include "parameters.h" |
| #include "object.h" |
| #include "layout.h" |
| #include "output.h" |
| #include "script-c.h" |
| #include "script.h" |
| #include "script-sections.h" |
| |
| // Support for the SECTIONS clause in linker scripts. |
| |
| namespace gold |
| { |
| |
| // A region of memory. |
| class Memory_region |
| { |
| public: |
| Memory_region(const char* name, size_t namelen, unsigned int attributes, |
| Expression* start, Expression* length) |
| : name_(name, namelen), |
| attributes_(attributes), |
| start_(start), |
| length_(length), |
| current_offset_(0), |
| vma_sections_(), |
| lma_sections_(), |
| last_section_(NULL) |
| { } |
| |
| // Return the name of this region. |
| const std::string& |
| name() const |
| { return this->name_; } |
| |
| // Return the start address of this region. |
| Expression* |
| start_address() const |
| { return this->start_; } |
| |
| // Return the length of this region. |
| Expression* |
| length() const |
| { return this->length_; } |
| |
| // Print the region (when debugging). |
| void |
| print(FILE*) const; |
| |
| // Return true if <name,namelen> matches this region. |
| bool |
| name_match(const char* name, size_t namelen) |
| { |
| return (this->name_.length() == namelen |
| && strncmp(this->name_.c_str(), name, namelen) == 0); |
| } |
| |
| Expression* |
| get_current_address() const |
| { |
| return |
| 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) |
| { |
| this->current_offset_ += amount; |
| |
| if (this->current_offset_ |
| > this->length_->eval(symtab, layout, false)) |
| 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 |
| has_room_for(const Symbol_table* symtab, const Layout* layout, |
| uint64_t amount) const |
| { |
| return (this->current_offset_ + amount |
| < this->length_->eval(symtab, layout, false)); |
| } |
| |
| // Return true if the provided section flags |
| // 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) |
| { |
| if (vma) |
| this->vma_sections_.push_back(sec); |
| else |
| this->lma_sections_.push_back(sec); |
| } |
| |
| typedef std::vector<Output_section_definition*> Section_list; |
| |
| // Return the start of the list of sections |
| // whose VMAs are taken from this region. |
| Section_list::const_iterator |
| get_vma_section_list_start() const |
| { return this->vma_sections_.begin(); } |
| |
| // Return the start of the list of sections |
| // whose LMAs are taken from this region. |
| Section_list::const_iterator |
| get_lma_section_list_start() const |
| { return this->lma_sections_.begin(); } |
| |
| // Return the end of the list of sections |
| // whose VMAs are taken from this region. |
| Section_list::const_iterator |
| get_vma_section_list_end() const |
| { return this->vma_sections_.end(); } |
| |
| // Return the end of the list of sections |
| // whose LMAs are taken from this region. |
| Section_list::const_iterator |
| get_lma_section_list_end() const |
| { return this->lma_sections_.end(); } |
| |
| Output_section_definition* |
| get_last_section() const |
| { return this->last_section_; } |
| |
| void |
| set_last_section(Output_section_definition* sec) |
| { this->last_section_ = sec; } |
| |
| private: |
| |
| std::string name_; |
| unsigned int attributes_; |
| Expression* start_; |
| Expression* length_; |
| // The offset to the next free byte in the region. |
| // Note - for compatibility with GNU LD we only maintain one offset |
| // regardless of whether the region is being used for VMA values, |
| // LMA values, or both. |
| uint64_t current_offset_; |
| // A list of sections whose VMAs are set inside this region. |
| Section_list vma_sections_; |
| // A list of sections whose LMAs are set inside this region. |
| Section_list lma_sections_; |
| // The latest section to make use of this region. |
| Output_section_definition* last_section_; |
| }; |
| |
| // Return true if the provided section flags |
| // are compatible with this region's attributes. |
| |
| bool |
| Memory_region::attributes_compatible(elfcpp::Elf_Xword flags, |
| elfcpp::Elf_Xword type) const |
| { |
| unsigned int attrs = this->attributes_; |
| |
| // No attributes means that this region is not compatible with anything. |
| if (attrs == 0) |
| return false; |
| |
| bool match = true; |
| do |
| { |
| switch (attrs & - attrs) |
| { |
| case MEM_EXECUTABLE: |
| if ((flags & elfcpp::SHF_EXECINSTR) == 0) |
| match = false; |
| break; |
| |
| case MEM_WRITEABLE: |
| if ((flags & elfcpp::SHF_WRITE) == 0) |
| match = false; |
| break; |
| |
| case MEM_READABLE: |
| // All sections are presumed readable. |
| break; |
| |
| case MEM_ALLOCATABLE: |
| if ((flags & elfcpp::SHF_ALLOC) == 0) |
| match = false; |
| break; |
| |
| case MEM_INITIALIZED: |
| if ((type & elfcpp::SHT_NOBITS) != 0) |
| match = false; |
| break; |
| } |
| attrs &= ~ (attrs & - attrs); |
| } |
| while (attrs != 0); |
| |
| return match; |
| } |
| |
| // Print a memory region. |
| |
| void |
| Memory_region::print(FILE* f) const |
| { |
| fprintf(f, " %s", this->name_.c_str()); |
| |
| unsigned int attrs = this->attributes_; |
| if (attrs != 0) |
| { |
| fprintf(f, " ("); |
| do |
| { |
| switch (attrs & - attrs) |
| { |
| case MEM_EXECUTABLE: fputc('x', f); break; |
| case MEM_WRITEABLE: fputc('w', f); break; |
| case MEM_READABLE: fputc('r', f); break; |
| case MEM_ALLOCATABLE: fputc('a', f); break; |
| case MEM_INITIALIZED: fputc('i', f); break; |
| default: |
| gold_unreachable(); |
| } |
| attrs &= ~ (attrs & - attrs); |
| } |
| while (attrs != 0); |
| fputc(')', f); |
| } |
| |
| fprintf(f, " : origin = "); |
| this->start_->print(f); |
| fprintf(f, ", length = "); |
| this->length_->print(f); |
| fprintf(f, "\n"); |
| } |
| |
| // 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); |
| |
| // Update PLACE_LAST_ALLOC. |
| void |
| update_last_alloc(Elements_iterator where); |
| |
| // 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_TLS, |
| PLACE_TLS_BSS, |
| PLACE_BSS, |
| PLACE_LAST_ALLOC, |
| 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_TLS, NULL); |
| this->initialize_place(PLACE_TLS_BSS, NULL); |
| this->initialize_place(PLACE_BSS, ".bss"); |
| this->initialize_place(PLACE_LAST_ALLOC, NULL); |
| 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; |
| |
| // Remember the last allocated section. Any orphan bss sections |
| // will be placed after it. |
| if (os != NULL |
| && (os->flags() & elfcpp::SHF_ALLOC) != 0) |
| { |
| this->places_[PLACE_LAST_ALLOC].location = location; |
| this->places_[PLACE_LAST_ALLOC].have_location = true; |
| } |
| |
| 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 ((flags & elfcpp::SHF_TLS) != 0) |
| { |
| if (type == elfcpp::SHT_NOBITS) |
| index = PLACE_TLS_BSS; |
| else |
| index = PLACE_TLS; |
| } |
| 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_DATA: |
| follow = PLACE_RODATA; |
| if (!this->places_[PLACE_RODATA].have_location) |
| follow = PLACE_TEXT; |
| break; |
| case PLACE_BSS: |
| follow = PLACE_LAST_ALLOC; |
| break; |
| case PLACE_REL: |
| follow = PLACE_TEXT; |
| break; |
| case PLACE_INTERP: |
| follow = PLACE_TEXT; |
| break; |
| case PLACE_TLS: |
| follow = PLACE_DATA; |
| break; |
| case PLACE_TLS_BSS: |
| follow = PLACE_TLS; |
| if (!this->places_[PLACE_TLS].have_location) |
| follow = PLACE_DATA; |
| 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; |
| } |
| |
| // Update PLACE_LAST_ALLOC. |
| void |
| Orphan_section_placement::update_last_alloc(Elements_iterator elem) |
| { |
| Elements_iterator prev = elem; |
| --prev; |
| if (this->places_[PLACE_LAST_ALLOC].have_location |
| && this->places_[PLACE_LAST_ALLOC].location == prev) |
| { |
| this->places_[PLACE_LAST_ALLOC].have_location = true; |
| this->places_[PLACE_LAST_ALLOC].location = elem; |
| } |
| } |
| |
| // 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 |
| { |
| public: |
| 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*, uint64_t*) |
| { } |
| |
| // Return the output section name to use for an input file name and |
| // section name. This only real implementation is in |
| // Output_section_definition. |
| virtual const char* |
| output_section_name(const char*, const char*, Output_section***, |
| Script_sections::Section_type*, bool*, bool) |
| { return NULL; } |
| |
| // 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 |
| // expression is an absolute value. |
| virtual void |
| set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*, |
| uint64_t*) |
| { } |
| |
| // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
| // this section is constrained, and the input sections do not match, |
| // return the constraint, and set *POSD. |
| virtual Section_constraint |
| check_constraint(Output_section_definition**) |
| { return CONSTRAINT_NONE; } |
| |
| // See if this is the alternate output section for a constrained |
| // output section. If it is, transfer the Output_section and return |
| // true. Otherwise return false. |
| virtual bool |
| 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; } |
| |
| // Set the section's memory regions. |
| virtual void |
| set_memory_region(Memory_region*, bool) |
| { gold_error(_("Attempt to set a memory region for a non-output section")); } |
| |
| // Print the element for debugging purposes. |
| virtual void |
| print(FILE* f) const = 0; |
| }; |
| |
| // An assignment in a SECTIONS clause outside of an output section. |
| |
| class Sections_element_assignment : public Sections_element |
| { |
| public: |
| Sections_element_assignment(const char* name, size_t namelen, |
| Expression* val, bool provide, bool hidden) |
| : assignment_(name, namelen, false, val, provide, hidden) |
| { } |
| |
| // Add the symbol to the symbol table. |
| void |
| add_symbols_to_table(Symbol_table* symtab) |
| { this->assignment_.add_to_table(symtab); } |
| |
| // Finalize the symbol. |
| void |
| finalize_symbols(Symbol_table* symtab, const Layout* layout, |
| uint64_t* dot_value) |
| { |
| this->assignment_.finalize_with_dot(symtab, layout, *dot_value, NULL); |
| } |
| |
| // Set the section address. There is no section here, but if the |
| // value is absolute, we set the symbol. This permits us to use |
| // absolute symbols when setting dot. |
| void |
| 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, NULL); |
| } |
| |
| // Print for debugging. |
| void |
| print(FILE* f) const |
| { |
| fprintf(f, " "); |
| this->assignment_.print(f); |
| } |
| |
| private: |
| Symbol_assignment assignment_; |
| }; |
| |
| // An assignment to the dot symbol in a SECTIONS clause outside of an |
| // output section. |
| |
| class Sections_element_dot_assignment : public Sections_element |
| { |
| public: |
| Sections_element_dot_assignment(Expression* val) |
| : val_(val) |
| { } |
| |
| // Finalize the symbol. |
| void |
| finalize_symbols(Symbol_table* symtab, const Layout* layout, |
| uint64_t* dot_value) |
| { |
| // We ignore the section of the result because outside of an |
| // 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, false); |
| } |
| |
| // Update the dot symbol while setting section addresses. |
| void |
| set_section_addresses(Symbol_table* symtab, Layout* layout, |
| uint64_t* dot_value, uint64_t* dot_alignment, |
| uint64_t* load_address) |
| { |
| *dot_value = this->val_->eval_with_dot(symtab, layout, false, *dot_value, |
| NULL, NULL, dot_alignment, false); |
| *load_address = *dot_value; |
| } |
| |
| // Print for debugging. |
| void |
| print(FILE* f) const |
| { |
| fprintf(f, " . = "); |
| this->val_->print(f); |
| fprintf(f, "\n"); |
| } |
| |
| private: |
| Expression* val_; |
| }; |
| |
| // An assertion in a SECTIONS clause outside of an output section. |
| |
| class Sections_element_assertion : public Sections_element |
| { |
| public: |
| Sections_element_assertion(Expression* check, const char* message, |
| size_t messagelen) |
| : assertion_(check, message, messagelen) |
| { } |
| |
| // Check the assertion. |
| void |
| finalize_symbols(Symbol_table* symtab, const Layout* layout, uint64_t*) |
| { this->assertion_.check(symtab, layout); } |
| |
| // Print for debugging. |
| void |
| print(FILE* f) const |
| { |
| fprintf(f, " "); |
| this->assertion_.print(f); |
| } |
| |
| private: |
| Script_assertion assertion_; |
| }; |
| |
| // An element in an output section in a SECTIONS clause. |
| |
| class Output_section_element |
| { |
| public: |
| // A list of input sections. |
| typedef std::list<Output_section::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*, uint64_t*, Output_section**) |
| { } |
| |
| // 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*, bool *) const |
| { return false; } |
| |
| // Set section addresses. This includes applying assignments if the |
| // expression is an absolute value. |
| virtual void |
| set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t, |
| uint64_t*, uint64_t*, Output_section**, std::string*, |
| Input_section_list*) |
| { } |
| |
| // Print the element for debugging purposes. |
| virtual void |
| print(FILE* f) const = 0; |
| |
| protected: |
| // Return a fill string that is LENGTH bytes long, filling it with |
| // FILL. |
| std::string |
| get_fill_string(const std::string* fill, section_size_type length) const; |
| }; |
| |
| std::string |
| Output_section_element::get_fill_string(const std::string* fill, |
| section_size_type length) const |
| { |
| std::string this_fill; |
| this_fill.reserve(length); |
| while (this_fill.length() + fill->length() <= length) |
| this_fill += *fill; |
| if (this_fill.length() < length) |
| this_fill.append(*fill, 0, length - this_fill.length()); |
| return this_fill; |
| } |
| |
| // A symbol assignment in an output section. |
| |
| class Output_section_element_assignment : public Output_section_element |
| { |
| public: |
| Output_section_element_assignment(const char* name, size_t namelen, |
| Expression* val, bool provide, |
| bool hidden) |
| : assignment_(name, namelen, false, val, provide, hidden) |
| { } |
| |
| // Add the symbol to the symbol table. |
| void |
| add_symbols_to_table(Symbol_table* symtab) |
| { this->assignment_.add_to_table(symtab); } |
| |
| // Finalize the symbol. |
| void |
| finalize_symbols(Symbol_table* symtab, const Layout* layout, |
| uint64_t* dot_value, Output_section** dot_section) |
| { |
| this->assignment_.finalize_with_dot(symtab, layout, *dot_value, |
| *dot_section); |
| } |
| |
| // Set the section address. There is no section here, but if the |
| // value is absolute, we set the symbol. This permits us to use |
| // absolute symbols when setting dot. |
| void |
| set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, |
| uint64_t, uint64_t* dot_value, uint64_t*, |
| Output_section** dot_section, std::string*, |
| Input_section_list*) |
| { |
| this->assignment_.set_if_absolute(symtab, layout, true, *dot_value, |
| *dot_section); |
| } |
| |
| // Print for debugging. |
| void |
| print(FILE* f) const |
| { |
| fprintf(f, " "); |
| this->assignment_.print(f); |
| } |
| |
| private: |
| Symbol_assignment assignment_; |
| }; |
| |
| // An assignment to the dot symbol in an output section. |
| |
| class Output_section_element_dot_assignment : public Output_section_element |
| { |
| public: |
| Output_section_element_dot_assignment(Expression* val) |
| : 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, |
| 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** dot_section, std::string*, |
| Input_section_list*); |
| |
| // Print for debugging. |
| void |
| print(FILE* f) const |
| { |
| fprintf(f, " . = "); |
| this->val_->print(f); |
| fprintf(f, "\n"); |
| } |
| |
| private: |
| Expression* val_; |
| }; |
| |
| // Update the dot symbol while setting section addresses. |
| |
| void |
| Output_section_element_dot_assignment::set_section_addresses( |
| Symbol_table* symtab, |
| Layout* layout, |
| Output_section* output_section, |
| uint64_t, |
| uint64_t* dot_value, |
| uint64_t* dot_alignment, |
| Output_section** dot_section, |
| std::string* fill, |
| Input_section_list*) |
| { |
| uint64_t next_dot = this->val_->eval_with_dot(symtab, layout, false, |
| *dot_value, *dot_section, |
| 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) |
| { |
| section_size_type length = convert_to_section_size_type(next_dot |
| - *dot_value); |
| Output_section_data* posd; |
| if (fill->empty()) |
| 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; |
| } |
| |
| // An assertion in an output section. |
| |
| class Output_section_element_assertion : public Output_section_element |
| { |
| public: |
| Output_section_element_assertion(Expression* check, const char* message, |
| size_t messagelen) |
| : assertion_(check, message, messagelen) |
| { } |
| |
| void |
| print(FILE* f) const |
| { |
| fprintf(f, " "); |
| this->assertion_.print(f); |
| } |
| |
| private: |
| Script_assertion assertion_; |
| }; |
| |
| // 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_data_expression : public Output_section_data |
| { |
| public: |
| 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) |
| { } |
| |
| protected: |
| // Write the data to the output file. |
| void |
| do_write(Output_file*); |
| |
| // Write the data to a buffer. |
| void |
| do_write_to_buffer(unsigned char*); |
| |
| // Write to a map file. |
| void |
| do_print_to_mapfile(Mapfile* mapfile) const |
| { mapfile->print_output_data(this, _("** expression")); } |
| |
| private: |
| template<bool big_endian> |
| void |
| endian_write_to_buffer(uint64_t, unsigned char*); |
| |
| bool is_signed_; |
| Expression* val_; |
| const Symbol_table* symtab_; |
| const Layout* layout_; |
| uint64_t dot_value_; |
| Output_section* dot_section_; |
| }; |
| |
| // Write the data element to the output file. |
| |
| void |
| Output_data_expression::do_write(Output_file* of) |
| { |
| 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); |
| } |
| |
| // Write the data element to a buffer. |
| |
| void |
| Output_data_expression::do_write_to_buffer(unsigned char* buf) |
| { |
| uint64_t val = this->val_->eval_with_dot(this->symtab_, this->layout_, |
| true, this->dot_value_, |
| this->dot_section_, NULL, NULL, |
| false); |
| |
| if (parameters->target().is_big_endian()) |
| this->endian_write_to_buffer<true>(val, buf); |
| else |
| this->endian_write_to_buffer<false>(val, buf); |
| } |
| |
| template<bool big_endian> |
| void |
| Output_data_expression::endian_write_to_buffer(uint64_t val, |
| unsigned char* buf) |
| { |
| switch (this->data_size()) |
| { |
| case 1: |
| elfcpp::Swap_unaligned<8, big_endian>::writeval(buf, val); |
| break; |
| case 2: |
| elfcpp::Swap_unaligned<16, big_endian>::writeval(buf, val); |
| break; |
| case 4: |
| elfcpp::Swap_unaligned<32, big_endian>::writeval(buf, val); |
| break; |
| case 8: |
| 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); |
| break; |
| default: |
| gold_unreachable(); |
| } |
| } |
| |
| // 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, uint64_t*, 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, |
| uint64_t*, |
| 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. |
| |
| void |
| Output_section_element_data::print(FILE* f) const |
| { |
| const char* s; |
| switch (this->size_) |
| { |
| case 1: |
| s = "BYTE"; |
| break; |
| case 2: |
| s = "SHORT"; |
| break; |
| case 4: |
| s = "LONG"; |
| break; |
| case 8: |
| if (this->is_signed_) |
| s = "SQUAD"; |
| else |
| s = "QUAD"; |
| break; |
| default: |
| gold_unreachable(); |
| } |
| fprintf(f, " %s(", s); |
| this->val_->print(f); |
| fprintf(f, ")\n"); |
| } |
| |
| // A fill value setting in an output section. |
| |
| class Output_section_element_fill : public Output_section_element |
| { |
| public: |
| Output_section_element_fill(Expression* val) |
| : val_(val) |
| { } |
| |
| // 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, uint64_t*, |
| Output_section** dot_section, |
| std::string* fill, Input_section_list*) |
| { |
| Output_section* fill_section; |
| uint64_t fill_val = this->val_->eval_with_dot(symtab, layout, false, |
| *dot_value, *dot_section, |
| &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. |
| unsigned char fill_buff[4]; |
| elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val); |
| fill->assign(reinterpret_cast<char*>(fill_buff), 4); |
| } |
| |
| // Print for debugging. |
| void |
| print(FILE* f) const |
| { |
| fprintf(f, " FILL("); |
| this->val_->print(f); |
| fprintf(f, ")\n"); |
| } |
| |
| private: |
| // The new fill value. |
| Expression* val_; |
| }; |
| |
| // An input section specification in an output section |
| |
| class Output_section_element_input : public Output_section_element |
| { |
| public: |
| Output_section_element_input(const Input_section_spec* spec, bool keep); |
| |
| // Finalize symbols--just update the value of the dot symbol. |
| void |
| finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value, |
| Output_section** dot_section) |
| { |
| *dot_value = this->final_dot_value_; |
| *dot_section = this->final_dot_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, bool* keep) const; |
| |
| // Set the section address. |
| void |
| set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, |
| uint64_t subalign, uint64_t* dot_value, uint64_t*, |
| Output_section**, std::string* fill, |
| Input_section_list*); |
| |
| // Print for debugging. |
| void |
| print(FILE* f) const; |
| |
| private: |
| // An input section pattern. |
| struct Input_section_pattern |
| { |
| std::string pattern; |
| bool pattern_is_wildcard; |
| Sort_wildcard sort; |
| |
| Input_section_pattern(const char* patterna, size_t patternlena, |
| Sort_wildcard sorta) |
| : pattern(patterna, patternlena), |
| pattern_is_wildcard(is_wildcard_string(this->pattern.c_str())), |
| sort(sorta) |
| { } |
| }; |
| |
| typedef std::vector<Input_section_pattern> Input_section_patterns; |
| |
| // Filename_exclusions is a pair of filename pattern and a bool |
| // indicating whether the filename is a wildcard. |
| typedef std::vector<std::pair<std::string, bool> > Filename_exclusions; |
| |
| // Return whether STRING matches PATTERN, where IS_WILDCARD_PATTERN |
| // indicates whether this is a wildcard pattern. |
| static inline bool |
| match(const char* string, const char* pattern, bool is_wildcard_pattern) |
| { |
| return (is_wildcard_pattern |
| ? fnmatch(pattern, string, 0) == 0 |
| : strcmp(string, pattern) == 0); |
| } |
| |
| // See if we match a file name. |
| bool |
| match_file_name(const char* file_name) const; |
| |
| // The file name pattern. If this is the empty string, we match all |
| // files. |
| std::string filename_pattern_; |
| // Whether the file name pattern is a wildcard. |
| bool filename_is_wildcard_; |
| // How the file names should be sorted. This may only be |
| // SORT_WILDCARD_NONE or SORT_WILDCARD_BY_NAME. |
| Sort_wildcard filename_sort_; |
| // The list of file names to exclude. |
| Filename_exclusions filename_exclusions_; |
| // The list of input section patterns. |
| Input_section_patterns input_section_patterns_; |
| // Whether to keep this section when garbage collecting. |
| 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 |
| // as pointers into a copy of the script file, which will go away when |
| // parsing is complete. We make sure they are in std::string objects. |
| |
| Output_section_element_input::Output_section_element_input( |
| const Input_section_spec* spec, |
| bool keep) |
| : filename_pattern_(), |
| filename_is_wildcard_(false), |
| filename_sort_(spec->file.sort), |
| filename_exclusions_(), |
| input_section_patterns_(), |
| keep_(keep), |
| final_dot_value_(0), |
| final_dot_section_(NULL) |
| { |
| // The filename pattern "*" is common, and matches all files. Turn |
| // it into the empty string. |
| if (spec->file.name.length != 1 || spec->file.name.value[0] != '*') |
| this->filename_pattern_.assign(spec->file.name.value, |
| spec->file.name.length); |
| this->filename_is_wildcard_ = is_wildcard_string(this->filename_pattern_.c_str()); |
| |
| if (spec->input_sections.exclude != NULL) |
| { |
| for (String_list::const_iterator p = |
| spec->input_sections.exclude->begin(); |
| p != spec->input_sections.exclude->end(); |
| ++p) |
| { |
| bool is_wildcard = is_wildcard_string((*p).c_str()); |
| this->filename_exclusions_.push_back(std::make_pair(*p, |
| is_wildcard)); |
| } |
| } |
| |
| if (spec->input_sections.sections != NULL) |
| { |
| Input_section_patterns& isp(this->input_section_patterns_); |
| for (String_sort_list::const_iterator p = |
| spec->input_sections.sections->begin(); |
| p != spec->input_sections.sections->end(); |
| ++p) |
| isp.push_back(Input_section_pattern(p->name.value, p->name.length, |
| p->sort)); |
| } |
| } |
| |
| // See whether we match FILE_NAME. |
| |
| bool |
| Output_section_element_input::match_file_name(const char* file_name) const |
| { |
| if (!this->filename_pattern_.empty()) |
| { |
| // If we were called with no filename, we refuse to match a |
| // pattern which requires a file name. |
| if (file_name == NULL) |
| return false; |
| |
| if (!match(file_name, this->filename_pattern_.c_str(), |
| this->filename_is_wildcard_)) |
| return false; |
| } |
| |
| if (file_name != NULL) |
| { |
| // Now we have to see whether FILE_NAME matches one of the |
| // exclusion patterns, if any. |
| for (Filename_exclusions::const_iterator p = |
| this->filename_exclusions_.begin(); |
| p != this->filename_exclusions_.end(); |
| ++p) |
| { |
| if (match(file_name, p->first.c_str(), p->second)) |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| // 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, |
| 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; |
| |
| // See whether we match the section name patterns. |
| for (Input_section_patterns::const_iterator p = |
| this->input_section_patterns_.begin(); |
| p != this->input_section_patterns_.end(); |
| ++p) |
| { |
| if (match(section_name, p->pattern.c_str(), p->pattern_is_wildcard)) |
| return true; |
| } |
| |
| // We didn't match any section names, so we didn't match. |
| return false; |
| } |
| |
| // Information we use to sort the input sections. |
| |
| class Input_section_info |
| { |
| public: |
| Input_section_info(const Output_section::Input_section& input_section) |
| : input_section_(input_section), section_name_(), |
| size_(0), addralign_(1) |
| { } |
| |
| // Return the simple input section. |
| const Output_section::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 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 |
| size() const |
| { return this->size_; } |
| |
| // Set the section size. |
| void |
| set_size(uint64_t size) |
| { this->size_ = size; } |
| |
| // Return the address alignment. |
| uint64_t |
| addralign() const |
| { return this->addralign_; } |
| |
| // Set the address alignment. |
| void |
| set_addralign(uint64_t addralign) |
| { this->addralign_ = addralign; } |
| |
| private: |
| // Input section, can be a relaxed section. |
| Output_section::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. |
| |
| class Input_section_sorter |
| { |
| public: |
| Input_section_sorter(Sort_wildcard filename_sort, Sort_wildcard section_sort) |
| : filename_sort_(filename_sort), section_sort_(section_sort) |
| { } |
| |
| bool |
| operator()(const Input_section_info&, const Input_section_info&) const; |
| |
| private: |
| static unsigned long |
| get_init_priority(const char*); |
| |
| Sort_wildcard filename_sort_; |
| Sort_wildcard section_sort_; |
| }; |
| |
| // Return a relative priority of the section with the specified NAME |
| // (a lower value meand a higher priority), or 0 if it should be compared |
| // with others as strings. |
| // The implementation of this function is copied from ld/ldlang.c. |
| |
| unsigned long |
| Input_section_sorter::get_init_priority(const char* name) |
| { |
| char* end; |
| unsigned long init_priority; |
| |
| // GCC uses the following section names for the init_priority |
| // attribute with numerical values 101 and 65535 inclusive. A |
| // lower value means a higher priority. |
| // |
| // 1: .init_array.NNNN/.fini_array.NNNN: Where NNNN is the |
| // decimal numerical value of the init_priority attribute. |
| // The order of execution in .init_array is forward and |
| // .fini_array is backward. |
| // 2: .ctors.NNNN/.dtors.NNNN: Where NNNN is 65535 minus the |
| // decimal numerical value of the init_priority attribute. |
| // The order of execution in .ctors is backward and .dtors |
| // is forward. |
| |
| if (strncmp(name, ".init_array.", 12) == 0 |
| || strncmp(name, ".fini_array.", 12) == 0) |
| { |
| init_priority = strtoul(name + 12, &end, 10); |
| return *end ? 0 : init_priority; |
| } |
| else if (strncmp(name, ".ctors.", 7) == 0 |
| || strncmp(name, ".dtors.", 7) == 0) |
| { |
| init_priority = strtoul(name + 7, &end, 10); |
| return *end ? 0 : 65535 - init_priority; |
| } |
| |
| return 0; |
| } |
| |
| bool |
| Input_section_sorter::operator()(const Input_section_info& isi1, |
| const Input_section_info& isi2) const |
| { |
| if (this->section_sort_ == SORT_WILDCARD_BY_INIT_PRIORITY) |
| { |
| unsigned long ip1 = get_init_priority(isi1.section_name().c_str()); |
| unsigned long ip2 = get_init_priority(isi2.section_name().c_str()); |
| if (ip1 != 0 && ip2 != 0 && ip1 != ip2) |
| return ip1 < ip2; |
| } |
| 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()) |
| || this->section_sort_ == SORT_WILDCARD_BY_INIT_PRIORITY) |
| { |
| 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 (this->filename_sort_ == SORT_WILDCARD_BY_NAME) |
| { |
| if (isi1.relobj()->name() != isi2.relobj()->name()) |
| return (isi1.relobj()->name() < isi2.relobj()->name()); |
| } |
| |
| // Otherwise we leave them in the same order. |
| return false; |
| } |
| |
| // Set the section address. Look in INPUT_SECTIONS for sections which |
| // match this spec, sort them as specified, and add them to the output |
| // section. |
| |
| void |
| Output_section_element_input::set_section_addresses( |
| Symbol_table*, |
| Layout* layout, |
| Output_section* output_section, |
| uint64_t subalign, |
| uint64_t* dot_value, |
| uint64_t*, |
| Output_section** dot_section, |
| std::string* fill, |
| Input_section_list* input_sections) |
| { |
| // 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(); |
| size_t bin_count = 1; |
| 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 (any_patterns_with_sort) |
| bin_count = input_pattern_count; |
| Matching_sections matching_sections(bin_count); |
| |
| // Look through the list of sections for this output section. Add |
| // each one which matches to one of the elements of |
| // MATCHING_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. |
| |
| // 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, relobj); |
| |
| isi.set_section_name(relobj->section_name(shndx)); |
| if (p->is_relaxed_input_section()) |
| { |
| // We use current data size because relaxed 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(relobj->name().c_str())) |
| ++p; |
| else if (this->input_section_patterns_.empty()) |
| { |
| matching_sections[0].push_back(isi); |
| p = input_sections->erase(p); |
| } |
| else |
| { |
| size_t i; |
| for (i = 0; i < input_pattern_count; ++i) |
| { |
| const Input_section_pattern& |
| isp(this->input_section_patterns_[i]); |
| if (match(isi.section_name().c_str(), isp.pattern.c_str(), |
| isp.pattern_is_wildcard)) |
| break; |
| } |
| |
| if (i >= input_pattern_count) |
| ++p; |
| else |
| { |
| if (i >= bin_count) |
| i = 0; |
| matching_sections[i].push_back(isi); |
| p = input_sections->erase(p); |
| } |
| } |
| } |
| |
| // Look through MATCHING_SECTIONS. Sort each one as specified, |
| // using a stable sort so that we get the default order when |
| // sections are otherwise equal. Add each input section to the |
| // output section. |
| |
| uint64_t dot = *dot_value; |
| for (size_t i = 0; i < bin_count; ++i) |
| { |
| if (matching_sections[i].empty()) |
| continue; |
| |
| gold_assert(output_section != NULL); |
| |
| const Input_section_pattern& isp(this->input_section_patterns_[i]); |
| if (isp.sort != SORT_WILDCARD_NONE |
| || this->filename_sort_ != SORT_WILDCARD_NONE) |
| std::stable_sort(matching_sections[i].begin(), |
| matching_sections[i].end(), |
| Input_section_sorter(this->filename_sort_, |
| isp.sort)); |
| |
| for (std::vector<Input_section_info>::const_iterator p = |
| matching_sections[i].begin(); |
| p != matching_sections[i].end(); |
| ++p) |
| { |
| // Override the original address alignment if SUBALIGN is specified. |
| // We need to make a copy of the input section to modify the |
| // alignment. |
| Output_section::Input_section sis(p->input_section()); |
| |
| uint64_t this_subalign = sis.addralign(); |
| if (!sis.is_input_section()) |
| sis.output_section_data()->finalize_data_size(); |
| uint64_t data_size = sis.data_size(); |
| if (subalign > 0) |
| { |
| this_subalign = subalign; |
| sis.set_addralign(subalign); |
| } |
| |
| uint64_t address = align_address(dot, this_subalign); |
| |
| if (address > dot && !fill->empty()) |
| { |
| section_size_type length = |
| 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_script_input_section(sis); |
| dot = address + data_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 |
| Output_section_element_input::print(FILE* f) const |
| { |
| fprintf(f, " "); |
| |
| if (this->keep_) |
| fprintf(f, "KEEP("); |
| |
| if (!this->filename_pattern_.empty()) |
| { |
| bool need_close_paren = false; |
| switch (this->filename_sort_) |
| { |
| case SORT_WILDCARD_NONE: |
| break; |
| case SORT_WILDCARD_BY_NAME: |
| fprintf(f, "SORT_BY_NAME("); |
| need_close_paren = true; |
| break; |
| default: |
| gold_unreachable(); |
| } |
| |
| fprintf(f, "%s", this->filename_pattern_.c_str()); |
| |
| if (need_close_paren) |
| fprintf(f, ")"); |
| } |
| |
| if (!this->input_section_patterns_.empty() |
| || !this->filename_exclusions_.empty()) |
| { |
| fprintf(f, "("); |
| |
| bool need_space = false; |
| if (!this->filename_exclusions_.empty()) |
| { |
| fprintf(f, "EXCLUDE_FILE("); |
| bool need_comma = false; |
| for (Filename_exclusions::const_iterator p = |
| this->filename_exclusions_.begin(); |
| p != this->filename_exclusions_.end(); |
| ++p) |
| { |
| if (need_comma) |
| fprintf(f, ", "); |
| fprintf(f, "%s", p->first.c_str()); |
| need_comma = true; |
| } |
| fprintf(f, ")"); |
| need_space = true; |
| } |
| |
| for (Input_section_patterns::const_iterator p = |
| this->input_section_patterns_.begin(); |
| p != this->input_section_patterns_.end(); |
| ++p) |
| { |
| if (need_space) |
| fprintf(f, " "); |
| |
| int close_parens = 0; |
| switch (p->sort) |
| { |
| case SORT_WILDCARD_NONE: |
| break; |
| case SORT_WILDCARD_BY_NAME: |
| fprintf(f, "SORT_BY_NAME("); |
| close_parens = 1; |
| break; |
| case SORT_WILDCARD_BY_ALIGNMENT: |
| fprintf(f, "SORT_BY_ALIGNMENT("); |
| close_parens = 1; |
| break; |
| case SORT_WILDCARD_BY_NAME_BY_ALIGNMENT: |
| fprintf(f, "SORT_BY_NAME(SORT_BY_ALIGNMENT("); |
| close_parens = 2; |
| break; |
| case SORT_WILDCARD_BY_ALIGNMENT_BY_NAME: |
| fprintf(f, "SORT_BY_ALIGNMENT(SORT_BY_NAME("); |
| close_parens = 2; |
| break; |
| case SORT_WILDCARD_BY_INIT_PRIORITY: |
| fprintf(f, "SORT_BY_INIT_PRIORITY("); |
| close_parens = 1; |
| break; |
| default: |
| gold_unreachable(); |
| } |
| |
| fprintf(f, "%s", p->pattern.c_str()); |
| |
| for (int i = 0; i < close_parens; ++i) |
| fprintf(f, ")"); |
| |
| need_space = true; |
| } |
| |
| fprintf(f, ")"); |
| } |
| |
| if (this->keep_) |
| fprintf(f, ")"); |
| |
| fprintf(f, "\n"); |
| } |
| |
| // An output section. |
| |
| class Output_section_definition : public Sections_element |
| { |
| public: |
| typedef Output_section_element::Input_section_list Input_section_list; |
| |
| Output_section_definition(const char* name, size_t namelen, |
| const Parser_output_section_header* header); |
| |
| // Finish the output section with the information in the trailer. |
| void |
| finish(const Parser_output_section_trailer* trailer); |
| |
| // Add a symbol to be defined. |
| void |
| add_symbol_assignment(const char* name, size_t length, Expression* value, |
| bool provide, bool hidden); |
| |
| // Add an assignment to the special dot symbol. |
| void |
| add_dot_assignment(Expression* value); |
| |
| // Add an assertion. |
| void |
| add_assertion(Expression* check, const char* message, size_t messagelen); |
| |
| // Add a data item to the current output section. |
| void |
| add_data(int size, bool is_signed, Expression* val); |
| |
| // Add a setting for the fill value. |
| void |
| add_fill(Expression* val); |
| |
| // Add an input section specification. |
| 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*, uint64_t*); |
| |
| // Return the output section name to use for an input file name and |
| // section name. |
| const char* |
| output_section_name(const char* file_name, const char* section_name, |
| Output_section***, Script_sections::Section_type*, |
| bool*, bool); |
| |
| // 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, |
| uint64_t* dot_value, uint64_t*, |
| 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, |
| // return the constraint, and set *POSD. |
| Section_constraint |
| check_constraint(Output_section_definition** posd); |
| |
| // See if this is the alternate output section for a constrained |
| // output section. If it is, transfer the Output_section and return |
| // true. Otherwise return false. |
| 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; |
| |
| // Return the output section type if specified or Script_sections::ST_NONE. |
| Script_sections::Section_type |
| section_type() const; |
| |
| // Store the memory region to use. |
| void |
| set_memory_region(Memory_region*, bool set_vma); |
| |
| void |
| set_section_vma(Expression* address) |
| { this->address_ = address; } |
| |
| void |
| set_section_lma(Expression* address) |
| { this->load_address_ = address; } |
| |
| const std::string& |
| get_section_name() const |
| { return this->name_; } |
| |
| private: |
| static const char* |
| script_section_type_name(Script_section_type); |
| |
| typedef std::vector<Output_section_element*> Output_section_elements; |
| |
| // The output section name. |
| std::string name_; |
| // The address. This may be NULL. |
| Expression* address_; |
| // The load address. This may be NULL. |
| Expression* load_address_; |
| // The alignment. This may be NULL. |
| Expression* align_; |
| // The input section alignment. This may be NULL. |
| Expression* subalign_; |
| // The constraint, if any. |
| 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_; |
| // The output section type if specified. |
| enum Script_section_type script_section_type_; |
| }; |
| |
| // Constructor. |
| |
| Output_section_definition::Output_section_definition( |
| const char* name, |
| size_t namelen, |
| const Parser_output_section_header* header) |
| : name_(name, namelen), |
| address_(header->address), |
| load_address_(header->load_address), |
| align_(header->align), |
| subalign_(header->subalign), |
| constraint_(header->constraint), |
| fill_(NULL), |
| phdrs_(NULL), |
| elements_(), |
| output_section_(NULL), |
| evaluated_address_(0), |
| evaluated_load_address_(0), |
| evaluated_addralign_(0), |
| is_relro_(false), |
| script_section_type_(header->section_type) |
| { |
| } |
| |
| // Finish an output section. |
| |
| void |
| Output_section_definition::finish(const Parser_output_section_trailer* trailer) |
| { |
| this->fill_ = trailer->fill; |
| this->phdrs_ = trailer->phdrs; |
| } |
| |
| // Add a symbol to be defined. |
| |
| void |
| Output_section_definition::add_symbol_assignment(const char* name, |
| size_t length, |
| Expression* value, |
| bool provide, |
| bool hidden) |
| { |
| Output_section_element* p = new Output_section_element_assignment(name, |
| length, |
| value, |
| provide, |
| hidden); |
| this->elements_.push_back(p); |
| } |
| |
| // Add an assignment to the special dot symbol. |
| |
| void |
| Output_section_definition::add_dot_assignment(Expression* value) |
| { |
| Output_section_element* p = new Output_section_element_dot_assignment(value); |
| this->elements_.push_back(p); |
| } |
| |
| // Add an assertion. |
| |
| void |
| Output_section_definition::add_assertion(Expression* check, |
| const char* message, |
| size_t messagelen) |
| { |
| Output_section_element* p = new Output_section_element_assertion(check, |
| message, |
| messagelen); |
| this->elements_.push_back(p); |
| } |
| |
| // Add a data item to the current output section. |
| |
| void |
| Output_section_definition::add_data(int size, bool is_signed, Expression* val) |
| { |
| Output_section_element* p = new Output_section_element_data(size, is_signed, |
| val); |
| this->elements_.push_back(p); |
| } |
| |
| // Add a setting for the fill value. |
| |
| void |
| Output_section_definition::add_fill(Expression* val) |
| { |
| Output_section_element* p = new Output_section_element_fill(val); |
| this->elements_.push_back(p); |
| } |
| |
| // Add an input section specification. |
| |
| void |
| Output_section_definition::add_input_section(const Input_section_spec* spec, |
| bool keep) |
| { |
| Output_section_element* p = new Output_section_element_input(spec, keep); |
| 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, this->section_type()); |
| return; |
| } |
| } |
| } |
| |
| // Add any symbols being defined to the symbol table. |
| |
| void |
| Output_section_definition::add_symbols_to_table(Symbol_table* symtab) |
| { |
| for (Output_section_elements::iterator p = this->elements_.begin(); |
| p != this->elements_.end(); |
| ++p) |
| (*p)->add_symbols_to_table(symtab); |
| } |
| |
| // Finalize symbols and check assertions. |
| |
| void |
| Output_section_definition::finalize_symbols(Symbol_table* symtab, |
| const Layout* layout, |
| uint64_t* dot_value) |
| { |
| if (this->output_section_ != NULL) |
| *dot_value = this->output_section_->address(); |
| else |
| { |
| uint64_t address = *dot_value; |
| if (this->address_ != NULL) |
| { |
| address = this->address_->eval_with_dot(symtab, layout, true, |
| *dot_value, NULL, |
| NULL, NULL, false); |
| } |
| if (this->align_ != NULL) |
| { |
| uint64_t align = this->align_->eval_with_dot(symtab, layout, true, |
| *dot_value, NULL, |
| NULL, NULL, false); |
| address = align_address(address, align); |
| } |
| *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)->finalize_symbols(symtab, layout, dot_value, &dot_section); |
| } |
| |
| // Return the output section name to use for an input section name. |
| |
| const char* |
| Output_section_definition::output_section_name( |
| const char* file_name, |
| const char* section_name, |
| Output_section*** slot, |
| Script_sections::Section_type* psection_type, |
| bool* keep, |
| bool match_input_spec) |
| { |
| // If the section is a linker-created output section, just look for a match |
| // on the output section name. |
| if (!match_input_spec && this->name_ != "/DISCARD/") |
| { |
| if (this->name_ != section_name) |
| return NULL; |
| *slot = &this->output_section_; |
| *psection_type = this->section_type(); |
| return this->name_.c_str(); |
| } |
| |
| // 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, keep)) |
| { |
| // We found a match for NAME, which means that it should go |
| // into this output section. |
| *slot = &this->output_section_; |
| *psection_type = this->section_type(); |
| return this->name_.c_str(); |
| } |
| } |
| |
| // We don't know about this section name. |
| return NULL; |
| } |
| |
| // Return true if memory from START to START + LENGTH is contained |
| // within a memory region. |
| |
| bool |
| Script_sections::block_in_region(Symbol_table* symtab, Layout* layout, |
| uint64_t start, uint64_t length) const |
| { |
| if (this->memory_regions_ == NULL) |
| return false; |
| |
| for (Memory_regions::const_iterator mr = this->memory_regions_->begin(); |
| mr != this->memory_regions_->end(); |
| ++mr) |
| { |
| uint64_t s = (*mr)->start_address()->eval(symtab, layout, false); |
| uint64_t l = (*mr)->length()->eval(symtab, layout, false); |
| |
| if (s <= start |
| && (s + l) >= (start + length)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| // Find a memory region that should be used by a given output SECTION. |
| // If provided set PREVIOUS_SECTION_RETURN to point to the last section |
| // that used the return memory region. |
| |
| Memory_region* |
| 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) |
| * previous_section_return = NULL; |
| |
| // Walk the memory regions specified in this script, if any. |
| if (this->memory_regions_ == NULL) |
| return NULL; |
| |
| // The /DISCARD/ section never gets assigned to any region. |
| if (section->get_section_name() == "/DISCARD/") |
| return NULL; |
| |
| Memory_region* first_match = NULL; |
| |
| // First check to see if a region has been assigned to this section. |
| for (Memory_regions::const_iterator mr = this->memory_regions_->begin(); |
| mr != this->memory_regions_->end(); |
| ++mr) |
| { |
| if (find_vma_region) |
| { |
| for (Memory_region::Section_list::const_iterator s = |
| (*mr)->get_vma_section_list_start(); |
| s != (*mr)->get_vma_section_list_end(); |
| ++s) |
| if ((*s) == section) |
| { |
| (*mr)->set_last_section(section); |
| return *mr; |
| } |
| } |
| else |
| { |
| for (Memory_region::Section_list::const_iterator s = |
| (*mr)->get_lma_section_list_start(); |
| s != (*mr)->get_lma_section_list_end(); |
| ++s) |
| if ((*s) == section) |
| { |
| (*mr)->set_last_section(section); |
| return *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 |
| // we will want to set the difference between the VMA and the LMA of the |
| // section were searching for to be the same as the difference between the |
| // VMA and LMA of the last section to be added to first matched region. |
| // Hence, if it was asked for, we return a pointer to the last section |
| // known to be used by the first matched region. |
| if (first_match != NULL |
| && previous_section_return != NULL) |
| *previous_section_return = first_match->get_last_section(); |
| |
| return first_match; |
| } |
| |
| // 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, |
| uint64_t* dot_value, |
| uint64_t* dot_alignment, |
| uint64_t* load_address) |
| { |
| Memory_region* vma_region = NULL; |
| Memory_region* lma_region = NULL; |
| Script_sections* script_sections = |
| layout->script_options()->script_sections(); |
| uint64_t address; |
| 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, |
| // use the next free address in the region. |
| // 3) Otherwise if memory regions have been specified find the first |
| // region whose attributes are compatible with this section and |
| // install it into that region. |
| // 4) Otherwise use the current location counter. |
| |
| if (this->output_section_ != NULL |
| // Check for --section-start. |
| && parameters->options().section_start(this->output_section_->name(), |
| &address)) |
| ; |
| else if (this->address_ == 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); |
| else |
| address = *dot_value; |
| } |
| else |
| { |
| 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) |
| { |
| if (this->output_section_ == NULL) |
| align = 0; |
| else |
| align = this->output_section_->addralign(); |
| } |
| else |
| { |
| Output_section* align_section; |
| align = this->align_->eval_with_dot(symtab, layout, true, *dot_value, |
| NULL, &align_section, NULL, false); |
| 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); |
| } |
| |
| uint64_t subalign; |
| if (this->subalign_ == NULL) |
| subalign = 0; |
| else |
| { |
| Output_section* subalign_section; |
| subalign = this->subalign_->eval_with_dot(symtab, layout, true, |
| *dot_value, NULL, |
| &subalign_section, NULL, |
| false); |
| if (subalign_section != NULL) |
| gold_warning(_("subalign of section %s is not absolute"), |
| this->name_.c_str()); |
| |
| // Reserve a value of 0 to mean there is no SUBALIGN property. |
| if (subalign == 0) |
| subalign = 1; |
| |
| // The external alignment of the output section must be at least |
| // as large as that of the input sections. If there is no |
| // explicit ALIGN property, we set the output section alignment |
| // to match the input section alignment. |
| if (align < subalign || this->align_ == NULL) |
| { |
| align = subalign; |
| this->output_section_->set_addralign(align); |
| } |
| } |
| |
| address = align_address(address, align); |
| |
| uint64_t start_address = address; |
| |
| *dot_value = address; |
| |
| // Except for NOLOAD sections, the address of non-SHF_ALLOC sections is |
| // forced to zero, regardless of what the linker script wants. |
| if (this->output_section_ != NULL |
| && ((this->output_section_->flags() & elfcpp::SHF_ALLOC) != 0 |
| || this->output_section_->is_noload())) |
| this->output_section_->set_address(address); |
| |
| this->evaluated_address_ = address; |
| this->evaluated_addralign_ = align; |
| |
| uint64_t laddr; |
| |
| if (this->load_address_ == NULL) |
| { |
| 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, false, |
| &previous_section); |
| |
| if (lma_region != NULL) |
| { |
| if (previous_section == NULL) |
| // The LMA address was explicitly set to the given region. |
| laddr = lma_region->get_current_address()->eval(symtab, layout, |
| false); |
| else |
| { |
| // We are not going to use the discovered lma_region, so |
| // make sure that we do not update it in the code below. |
| lma_region = NULL; |
| |
| if (this->address_ != NULL || previous_section == this) |
| { |
| // Either an explicit VMA address has been set, or an |
| // explicit VMA region has been set, so set the LMA equal to |
| // the VMA. |
| laddr = address; |
| } |
| else |
| { |
| // The LMA address was not explicitly or implicitly set. |
| // |
| // We have been given the first memory region that is |
| // compatible with the current section and a pointer to the |
| // last section to use this region. Set the LMA of this |
| // section so that the difference between its' VMA and LMA |
| // is the same as the difference between the VMA and LMA of |
| // the last section in the given region. |
| laddr = address + (previous_section->evaluated_load_address_ |
| - previous_section->evaluated_address_); |
| } |
| } |
| |
| if (this->output_section_ != NULL) |
| this->output_section_->set_load_address(laddr); |
| } |
| else |
| { |
| // Do not set the load address of the output section, if one exists. |
| // This allows future sections to determine what the load address |
| // should be. If none is ever set, it will default to being the |
| // same as the vma address. |
| laddr = address; |
| } |
| } |
| else |
| { |
| laddr = this->load_address_->eval_with_dot(symtab, layout, true, |
| *dot_value, |
| this->output_section_, |
| NULL, NULL, false); |
| if (this->output_section_ != NULL) |
| this->output_section_->set_load_address(laddr); |
| } |
| |
| this->evaluated_load_address_ = laddr; |
| |
| std::string fill; |
| if (this->fill_ != NULL) |
| { |
| // FIXME: The GNU linker supports fill values of arbitrary |
| // length. |
| Output_section* fill_section; |
| uint64_t fill_val = this->fill_->eval_with_dot(symtab, layout, true, |
| *dot_value, |
| NULL, &fill_section, |
| NULL, false); |
| 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); |
| } |
| |
| Input_section_list input_sections; |
| if (this->output_section_ != NULL) |
| { |
| // Get the list of input sections attached to this output |
| // section. This will leave the output section with only |
| // Output_section_data entries. |
| address += this->output_section_->get_input_sections(address, |
| fill, |
| &input_sections); |
| *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, dot_alignment, |
| &dot_section, &fill, &input_sections); |
| |
| gold_assert(input_sections.empty()); |
| |
| if (vma_region != NULL) |
| { |
| // Update the VMA region being used by the section now that we know how |
| // big it is. Use the current address in the region, rather than |
| // start_address because that might have been aligned upwards and we |
| // need to allow for the padding. |
| Expression* addr = vma_region->get_current_address(); |
| uint64_t size = *dot_value - addr->eval(symtab, layout, false); |
| |
| vma_region->increment_offset(this->get_section_name(), size, |
| symtab, layout); |
| } |
| |
| // If the LMA region is different from the VMA region, then increment the |
| // offset there as well. Note that we use the same "dot_value - |
| // start_address" formula that is used in the load_address assignment below. |
| if (lma_region != NULL && lma_region != vma_region) |
| lma_region->increment_offset(this->get_section_name(), |
| *dot_value - start_address, |
| symtab, layout); |
| |
| // Compute the load address for the following section. |
| if (this->output_section_ == NULL) |
| *load_address = *dot_value; |
| else if (this->load_address_ == NULL) |
| { |
| if (lma_region == NULL) |
| *load_address = *dot_value; |
| else |
| *load_address = |
| lma_region->get_current_address()->eval(symtab, layout, false); |
| } |
| 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(); |
| |
| // If this is a NOLOAD section, keep dot and load address unchanged. |
| if (this->output_section_->is_noload()) |
| { |
| *dot_value = old_dot_value; |
| *load_address = old_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, |
| // return the constraint, and set *POSD. |
| |
| Section_constraint |
| Output_section_definition::check_constraint(Output_section_definition** posd) |
| { |
| switch (this->constraint_) |
| { |
| case CONSTRAINT_NONE: |
| return CONSTRAINT_NONE; |
| |
| case CONSTRAINT_ONLY_IF_RO: |
| if (this->output_section_ != NULL |
| && (this->output_section_->flags() & elfcpp::SHF_WRITE) != 0) |
| { |
| *posd = this; |
| return CONSTRAINT_ONLY_IF_RO; |
| } |
| return CONSTRAINT_NONE; |
| |
| case CONSTRAINT_ONLY_IF_RW: |
| if (this->output_section_ != NULL |
| && (this->output_section_->flags() & elfcpp::SHF_WRITE) == 0) |
| { |
| *posd = this; |
| return CONSTRAINT_ONLY_IF_RW; |
| } |
| return CONSTRAINT_NONE; |
| |
| case CONSTRAINT_SPECIAL: |
| if (this->output_section_ != NULL) |
| gold_error(_("SPECIAL constraints are not implemented")); |
| return CONSTRAINT_NONE; |
| |
| default: |
| gold_unreachable(); |
| } |
| } |
| |
| // See if this is the alternate output section for a constrained |
| // output section. If it is, transfer the Output_section and return |
| // true. Otherwise return false. |
| |
| bool |
| Output_section_definition::alternate_constraint( |
| Output_section_definition* posd, |
| Section_constraint constraint) |
| { |
| if (this->name_ != posd->name_) |
| return false; |
| |
| switch (constraint) |
| { |
| case CONSTRAINT_ONLY_IF_RO: |
| if (this->constraint_ != CONSTRAINT_ONLY_IF_RW) |
| return false; |
| break; |
| |
| case CONSTRAINT_ONLY_IF_RW: |
| if (this->constraint_ != CONSTRAINT_ONLY_IF_RO) |
| return false; |
| break; |
| |
| default: |
| gold_unreachable(); |
| } |
| |
| // We have found the alternate constraint. We just need to move |
| // over the Output_section. When constraints are used properly, |
| // THIS should not have an output_section pointer, as all the input |
| // sections should have matched the other definition. |
| |
| if (this->output_section_ != NULL) |
| gold_error(_("mismatched definition for constrained sections")); |
| |
| 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) |
| { |
| // Update phdrs_list even if we don't have an output section. It |
| // might be used by the following sections. |
| if (this->phdrs_ != NULL) |
| *phdrs_list = this->phdrs_; |
| |
| if (this->output_section_ == NULL) |
| return NULL; |
| if ((this->output_section_->flags() & elfcpp::SHF_ALLOC) == 0) |
| return NULL; |
| *orphan = false; |
| 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* addralign, |
| 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; |
| *addralign = this->output_section_->addralign(); |
| *size = this->output_section_->current_data_size(); |
| } |
| else |
| { |
| *address = this->evaluated_address_; |
| *load_address = this->evaluated_load_address_; |
| *addralign = this->evaluated_addralign_; |
| *size = 0; |
| } |
| |
| return true; |
| } |
| |
| // Print for debugging. |
| |
| void |
| Output_section_definition::print(FILE* f) const |
| { |
| fprintf(f, " %s ", this->name_.c_str()); |
| |
| if (this->address_ != NULL) |
| { |
| this->address_->print(f); |
| fprintf(f, " "); |
| } |
| |
| if (this->script_section_type_ != SCRIPT_SECTION_TYPE_NONE) |
| fprintf(f, "(%s) ", |
| this->script_section_type_name(this->script_section_type_)); |
| |
| fprintf(f, ": "); |
| |
| if (this->load_address_ != NULL) |
| { |
| fprintf(f, "AT("); |
| this->load_address_->print(f); |
| fprintf(f, ") "); |
| } |
| |
| if (this->align_ != NULL) |
| { |
| fprintf(f, "ALIGN("); |
| this->align_->print(f); |
| fprintf(f, ") "); |
| } |
| |
| if (this->subalign_ != NULL) |
| { |
| fprintf(f, "SUBALIGN("); |
| this->subalign_->print(f); |
| fprintf(f, ") "); |
| } |
| |
| fprintf(f, "{\n"); |
| |
| for (Output_section_elements::const_iterator p = this->elements_.begin(); |
| p != this->elements_.end(); |
| ++p) |
| (*p)->print(f); |
| |
| fprintf(f, " }"); |
| |
| if (this->fill_ != NULL) |
| { |
| fprintf(f, " = "); |
| 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"); |
| } |
| |
| Script_sections::Section_type |
| Output_section_definition::section_type() const |
| { |
| switch (this->script_section_type_) |
| { |
| case SCRIPT_SECTION_TYPE_NONE: |
| return Script_sections::ST_NONE; |
| case SCRIPT_SECTION_TYPE_NOLOAD: |
| return Script_sections::ST_NOLOAD; |
| case SCRIPT_SECTION_TYPE_COPY: |
| case SCRIPT_SECTION_TYPE_DSECT: |
| case SCRIPT_SECTION_TYPE_INFO: |
| case SCRIPT_SECTION_TYPE_OVERLAY: |
| // There are not really support so we treat them as ST_NONE. The |
| // parse should have issued errors for them already. |
| return Script_sections::ST_NONE; |
| default: |
| gold_unreachable(); |
| } |
| } |
| |
| // Return the name of a script section type. |
| |
| const char* |
| Output_section_definition::script_section_type_name( |
| Script_section_type script_section_type) |
| { |
| switch (script_section_type) |
| { |
| case SCRIPT_SECTION_TYPE_NONE: |
| return "NONE"; |
| case SCRIPT_SECTION_TYPE_NOLOAD: |
| return "NOLOAD"; |
| case SCRIPT_SECTION_TYPE_DSECT: |
| return "DSECT"; |
| case SCRIPT_SECTION_TYPE_COPY: |
| return "COPY"; |
| case SCRIPT_SECTION_TYPE_INFO: |
| return "INFO"; |
| case SCRIPT_SECTION_TYPE_OVERLAY: |
| return "OVERLAY"; |
| default: |
| gold_unreachable(); |
| } |
| } |
| |
| void |
| Output_section_definition::set_memory_region(Memory_region* mr, bool set_vma) |
| { |
| gold_assert(mr != NULL); |
| // Add the current section to the specified region's list. |
| mr->add_section(this, set_vma); |
| } |
| |
| // An output section created to hold orphaned input sections. These |
| // do not actually appear in linker scripts. However, for convenience |
| // when setting the output section addresses, we put a marker to these |
| // sections in the appropriate place in the list of SECTIONS elements. |
| |
| class Orphan_output_section : public Sections_element |
| { |
| public: |
| Orphan_output_section(Output_section* os) |
| : os_(os) |
| { } |
| |
| // 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 |
| 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*, uint64_t*, 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 |
| print(FILE* f) const |
| { |
| fprintf(f, " marker for orphaned output section %s\n", |
| this->os_->name()); |
| } |
| |
| private: |
| Output_section* os_; |
| }; |
| |
| // Set section addresses. |
| |
| void |
| Orphan_output_section::set_section_addresses(Symbol_table*, Layout*, |
| uint64_t* dot_value, |
| uint64_t*, |
| uint64_t* load_address) |
| { |
| typedef std::list<Output_section::Input_section> Input_section_list; |
| |
| bool have_load_address = *load_address != *dot_value; |
| |
| 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 |
| // script to override that for specific output sections. |
| if (parameters->options().relocatable()) |
| { |
| address = 0; |
| *load_address = 0; |
| have_load_address = false; |
| } |
| |
| if ((this->os_->flags() & elfcpp::SHF_ALLOC) != 0) |
| { |
| 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); |
| |
| for (Input_section_list::iterator p = input_sections.begin(); |
| p != input_sections.end(); |
| ++p) |
| { |
| uint64_t addralign = p->addralign(); |
| if (!p->is_input_section()) |
| p->output_section_data()->finalize_data_size(); |
| uint64_t size = p->data_size(); |
| address = align_address(address, addralign); |
| this->os_->add_script_input_section(*p); |
| address += size; |
| } |
| |
| 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 |
| *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* name, size_t namelen, unsigned int type, |
| bool includes_filehdr, bool includes_phdrs, |
| bool is_flags_valid, unsigned int flags, |
| Expression* load_address) |
| : name_(name, namelen), type_(type), includes_filehdr_(includes_filehdr), |
| includes_phdrs_(includes_phdrs), is_flags_valid_(is_flags_valid), |
| flags_(flags), load_address_(load_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 |
| |