// layout.cc -- lay out output file sections for gold
-// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
// Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
{
public:
Hash_task(const unsigned char* src,
- size_t size,
- unsigned char* dst,
- Task_token* build_id_blocker,
- Task_token* final_blocker)
+ size_t size,
+ unsigned char* dst,
+ Task_token* build_id_blocker,
+ Task_token* final_blocker)
: src_(src), size_(size), dst_(dst), build_id_blocker_(build_id_blocker),
final_blocker_(final_blocker)
{ }
void
Layout::Relaxation_debug_check::check_output_data_for_reset_values(
const Layout::Section_list& sections,
- const Layout::Data_list& special_outputs)
+ const Layout::Data_list& special_outputs,
+ const Layout::Data_list& relax_outputs)
{
for(Layout::Section_list::const_iterator p = sections.begin();
p != sections.end();
p != special_outputs.end();
++p)
gold_assert((*p)->address_and_file_offset_have_reset_values());
+
+ gold_assert(relax_outputs.empty());
}
// Save information of SECTIONS for checking later.
section_list_(),
unattached_section_list_(),
special_output_list_(),
+ relax_output_list_(),
section_headers_(NULL),
tls_segment_(NULL),
relro_segment_(NULL),
// wind up in the .text section. Sections that start with these
// prefixes must appear first, and must appear in the order listed
// here.
- static const char* const text_section_sort[] =
+ static const char* const text_section_sort[] =
{
".text.unlikely",
".text.exit",
= this->section_segment_map_.find(Const_section_id(object, shndx));
if (it == this->section_segment_map_.end())
{
- os = this->choose_output_section(object, name, sh_type,
+ os = this->choose_output_section(object, name, sh_type,
shdr.get_sh_flags(), true,
ORDER_INVALID, false);
}
Layout::insert_section_segment_map(Const_section_id secn,
Unique_segment_info *s)
{
- gold_assert(this->unique_segment_for_sections_specified_);
+ gold_assert(this->unique_segment_for_sections_specified_);
this->section_segment_map_[secn] = s;
}
&& strcmp(name, ".text") == 0)
os->set_may_sort_attached_input_sections();
+ // GNU linker sorts section by name with --sort-section=name.
+ if (strcmp(parameters->options().sort_section(), "name") == 0)
+ os->set_must_sort_attached_input_sections();
+
// Check for .stab*str sections, as .stab* sections need to link to
// them.
if (type == elfcpp::SHT_STRTAB
if (!os->is_unique_segment())
{
for (p = this->segment_list_.begin();
- p != this->segment_list_.end();
+ p != this->segment_list_.end();
++p)
{
- if ((*p)->type() != elfcpp::PT_LOAD)
- continue;
- if ((*p)->is_unique_segment())
- continue;
- if (!parameters->options().omagic()
- && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W))
- continue;
- if ((target->isolate_execinstr() || parameters->options().rosegment())
- && ((*p)->flags() & elfcpp::PF_X) != (seg_flags & elfcpp::PF_X))
- continue;
- // If -Tbss was specified, we need to separate the data and BSS
- // segments.
- if (parameters->options().user_set_Tbss())
- {
- if ((os->type() == elfcpp::SHT_NOBITS)
- == (*p)->has_any_data_sections())
- continue;
- }
- if (os->is_large_data_section() && !(*p)->is_large_data_segment())
- continue;
-
- if (is_address_set)
- {
- if ((*p)->are_addresses_set())
- continue;
-
- (*p)->add_initial_output_data(os);
- (*p)->update_flags_for_output_section(seg_flags);
- (*p)->set_addresses(addr, addr);
- break;
- }
-
- (*p)->add_output_section_to_load(this, os, seg_flags);
- break;
- }
+ if ((*p)->type() != elfcpp::PT_LOAD)
+ continue;
+ if ((*p)->is_unique_segment())
+ continue;
+ if (!parameters->options().omagic()
+ && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W))
+ continue;
+ if ((target->isolate_execinstr() || parameters->options().rosegment())
+ && ((*p)->flags() & elfcpp::PF_X) != (seg_flags & elfcpp::PF_X))
+ continue;
+ // If -Tbss was specified, we need to separate the data and BSS
+ // segments.
+ if (parameters->options().user_set_Tbss())
+ {
+ if ((os->type() == elfcpp::SHT_NOBITS)
+ == (*p)->has_any_data_sections())
+ continue;
+ }
+ if (os->is_large_data_section() && !(*p)->is_large_data_segment())
+ continue;
+
+ if (is_address_set)
+ {
+ if ((*p)->are_addresses_set())
+ continue;
+
+ (*p)->add_initial_output_data(os);
+ (*p)->update_flags_for_output_section(seg_flags);
+ (*p)->set_addresses(addr, addr);
+ break;
+ }
+
+ (*p)->add_output_section_to_load(this, os, seg_flags);
+ break;
+ }
}
if (p == this->segment_list_.end()
++p)
delete *p;
this->script_output_section_data_list_.clear();
+
+ // Special-case fill output objects are recreated each time through
+ // the relaxation loop.
+ this->reset_relax_output();
+}
+
+void
+Layout::reset_relax_output()
+{
+ for (Data_list::const_iterator p = this->relax_output_list_.begin();
+ p != this->relax_output_list_.end();
+ ++p)
+ delete *p;
+ this->relax_output_list_.clear();
}
// Prepare for relaxation.
if (is_debugging_enabled(DEBUG_RELAXATION))
this->relaxation_debug_check_->check_output_data_for_reset_values(
- this->section_list_, this->special_output_list_);
+ this->section_list_, this->special_output_list_,
+ this->relax_output_list_);
// Also enable recording of output section data from scripts.
this->record_output_section_data_from_script_ = true;
}
+// If the user set the address of the text segment, that may not be
+// compatible with putting the segment headers and file headers into
+// that segment. For isolate_execinstr() targets, it's the rodata
+// segment rather than text where we might put the headers.
+static inline bool
+load_seg_unusable_for_headers(const Target* target)
+{
+ const General_options& options = parameters->options();
+ if (target->isolate_execinstr())
+ return (options.user_set_Trodata_segment()
+ && options.Trodata_segment() % target->abi_pagesize() != 0);
+ else
+ return (options.user_set_Ttext()
+ && options.Ttext() % target->abi_pagesize() != 0);
+}
+
// Relaxation loop body: If target has no relaxation, this runs only once
// Otherwise, the target relaxation hook is called at the end of
// each iteration. If the hook returns true, it means re-layout of
!= General_options::OBJECT_FORMAT_ELF)
load_seg = NULL;
- // If the user set the address of the text segment, that may not be
- // compatible with putting the segment headers and file headers into
- // that segment.
- if (parameters->options().user_set_Ttext()
- && parameters->options().Ttext() % target->abi_pagesize() != 0)
+ if (load_seg_unusable_for_headers(target))
{
load_seg = NULL;
phdr_seg = NULL;
symtab->define_in_output_segment("__ehdr_start", NULL,
Symbol_table::PREDEFINED, load_seg, 0, 0,
elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
- elfcpp::STV_DEFAULT, 0,
+ elfcpp::STV_HIDDEN, 0,
Symbol::SEGMENT_START, true);
// Set the file offsets of all the non-data sections we've seen so
return aligned_off;
}
+// On targets where the text segment contains only executable code,
+// a non-executable segment is never the text segment.
+
+static inline bool
+is_text_segment(const Target* target, const Output_segment* seg)
+{
+ elfcpp::Elf_Xword flags = seg->flags();
+ if ((flags & elfcpp::PF_W) != 0)
+ return false;
+ if ((flags & elfcpp::PF_X) == 0)
+ return !target->isolate_execinstr();
+ return true;
+}
+
// Set the file offsets of all the segments, and all the sections they
// contain. They have all been created. LOAD_SEG must be be laid out
// first. Return the offset of the data to follow.
}
else if (parameters->options().user_set_Ttext()
&& (parameters->options().omagic()
- || ((*p)->flags() & elfcpp::PF_W) == 0))
+ || is_text_segment(target, *p)))
{
are_addresses_set = true;
}
+ else if (parameters->options().user_set_Trodata_segment()
+ && ((*p)->flags() & (elfcpp::PF_W | elfcpp::PF_X)) == 0)
+ {
+ addr = parameters->options().Trodata_segment();
+ are_addresses_set = true;
+ }
else if (parameters->options().user_set_Tdata()
&& ((*p)->flags() & elfcpp::PF_W) != 0
&& (!parameters->options().user_set_Tbss()
// If the target wants a fixed minimum distance from the
// text segment to the read-only segment, move up now.
- uint64_t min_addr = start_addr + target->rosegment_gap();
+ uint64_t min_addr =
+ start_addr + (parameters->options().user_set_rosegment_gap()
+ ? parameters->options().rosegment_gap()
+ : target->rosegment_gap());
if (addr < min_addr)
addr = min_addr;
if (!parameters->options().nmagic()
&& !parameters->options().omagic())
- off = align_file_offset(off, addr, abi_pagesize);
+ {
+ // Here we are also taking care of the case when
+ // the maximum segment alignment is larger than the page size.
+ off = align_file_offset(off, addr,
+ std::max(abi_pagesize,
+ (*p)->maximum_alignment()));
+ }
else
{
// This is -N or -n with a section script which prevents
unsigned int shndx_hold = *pshndx;
bool has_relro = false;
- uint64_t new_addr = (*p)->set_section_addresses(this, false, addr,
+ uint64_t new_addr = (*p)->set_section_addresses(target, this,
+ false, addr,
&increase_relro,
&has_relro,
&off, pshndx);
increase_relro = 0;
has_relro = false;
- new_addr = (*p)->set_section_addresses(this, true, addr,
+ new_addr = (*p)->set_section_addresses(target, this,
+ true, addr,
&increase_relro,
&has_relro,
&off, pshndx);
// so they land after the segments starting at LOAD_SEG.
off = align_file_offset(off, 0, target->abi_pagesize());
+ this->reset_relax_output();
+
for (Segment_list::iterator p = this->segment_list_.begin();
*p != load_seg;
++p)
bool has_relro = false;
const uint64_t old_addr = (*p)->vaddr();
const uint64_t old_end = old_addr + (*p)->memsz();
- uint64_t new_addr = (*p)->set_section_addresses(this, true,
- old_addr,
+ uint64_t new_addr = (*p)->set_section_addresses(target, this,
+ true, old_addr,
&increase_relro,
&has_relro,
&off,
p != this->special_output_list_.end();
++p)
(*p)->write(of);
+
+ // Write out the Output_data which are not in an Output_section
+ // and are regenerated in each iteration of relaxation.
+ for (Data_list::const_iterator p = this->relax_output_list_.begin();
+ p != this->relax_output_list_.end();
+ ++p)
+ (*p)->write(of);
}
// Write out the Output_sections which can only be written after the
Task_token*
Layout::queue_build_id_tasks(Workqueue* workqueue, Task_token* build_id_blocker,
- Output_file* of)
+ Output_file* of)
{
const size_t filesize = (this->output_file_size() <= 0 ? 0
- : static_cast<size_t>(this->output_file_size()));
+ : static_cast<size_t>(this->output_file_size()));
if (this->build_id_note_ != NULL
&& strcmp(parameters->options().build_id(), "tree") == 0
&& parameters->options().build_id_chunk_size_for_treehash() > 0
&& filesize > 0
&& (filesize >=
- parameters->options().build_id_min_file_size_for_treehash()))
+ parameters->options().build_id_min_file_size_for_treehash()))
{
static const size_t MD5_OUTPUT_SIZE_IN_BYTES = 16;
const size_t chunk_size =
- parameters->options().build_id_chunk_size_for_treehash();
+ parameters->options().build_id_chunk_size_for_treehash();
const size_t num_hashes = ((filesize - 1) / chunk_size) + 1;
Task_token* post_hash_tasks_blocker = new Task_token(true);
post_hash_tasks_blocker->add_blockers(num_hashes);
unsigned char *dst = new unsigned char[this->size_of_array_of_hashes_];
this->array_of_hashes_ = dst;
for (size_t i = 0, src_offset = 0; i < num_hashes;
- i++, dst += MD5_OUTPUT_SIZE_IN_BYTES, src_offset += chunk_size)
- {
- size_t size = std::min(chunk_size, filesize - src_offset);
- workqueue->queue(new Hash_task(src + src_offset,
- size,
- dst,
- build_id_blocker,
- post_hash_tasks_blocker));
- }
+ i++, dst += MD5_OUTPUT_SIZE_IN_BYTES, src_offset += chunk_size)
+ {
+ size_t size = std::min(chunk_size, filesize - src_offset);
+ workqueue->queue(new Hash_task(src + src_offset,
+ size,
+ dst,
+ build_id_blocker,
+ post_hash_tasks_blocker));
+ }
return post_hash_tasks_blocker;
}
return build_id_blocker;
return;
unsigned char* ov = of->get_output_view(this->build_id_note_->offset(),
- this->build_id_note_->data_size());
+ this->build_id_note_->data_size());
if (this->array_of_hashes_ == NULL)
{
// If we get here with style == "tree" then the output must be
// too small for chunking, and we use SHA-1 in that case.
if ((strcmp(style, "sha1") == 0) || (strcmp(style, "tree") == 0))
- sha1_buffer(reinterpret_cast<const char*>(iv), output_file_size, ov);
+ sha1_buffer(reinterpret_cast<const char*>(iv), output_file_size, ov);
else if (strcmp(style, "md5") == 0)
- md5_buffer(reinterpret_cast<const char*>(iv), output_file_size, ov);
+ md5_buffer(reinterpret_cast<const char*>(iv), output_file_size, ov);
else
- gold_unreachable();
+ gold_unreachable();
of->free_input_view(0, output_file_size, iv);
}
// Non-overlapping substrings of the output file have been hashed.
// Compute SHA-1 hash of the hashes.
sha1_buffer(reinterpret_cast<const char*>(this->array_of_hashes_),
- this->size_of_array_of_hashes_, ov);
+ this->size_of_array_of_hashes_, ov);
delete[] this->array_of_hashes_;
of->free_input_view(0, this->output_file_size(), this->input_view_);
}
projects / deliverable / binutils-gdb.git / blobdiff