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_vma_offset_(0),
+ current_lma_offset_(0),
+ vma_sections_(NULL),
+ lma_sections_(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_vma_address(void) const
+ {
+ return
+ script_exp_binary_add(this->start_,
+ script_exp_integer(this->current_vma_offset_));
+ }
+
+ Expression*
+ get_current_lma_address(void) const
+ {
+ return
+ script_exp_binary_add(this->start_,
+ script_exp_integer(this->current_lma_offset_));
+ }
+
+ void
+ increment_vma_offset(std::string section_name, uint64_t amount,
+ const Symbol_table* symtab, const Layout* layout)
+ {
+ this->current_vma_offset_ += amount;
+
+ if (this->current_vma_offset_
+ > this->length_->eval(symtab, layout, false))
+ gold_error (_("section %s overflows end of region %s"),
+ section_name.c_str(), this->name_.c_str());
+ }
+
+ void
+ increment_lma_offset(std::string section_name, uint64_t amount,
+ const Symbol_table* symtab, const Layout* layout)
+ {
+ this->current_lma_offset_ += amount;
+
+ if (this->current_lma_offset_
+ > this->length_->eval(symtab, layout, false))
+ gold_error (_("section %s overflows end of region %s (based on load address)"),
+ section_name.c_str(), this->name_.c_str());
+ }
+
+ 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(void) 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(void) 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(void) 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(void) const
+ { return this->lma_sections_.end(); }
+
+ private:
+
+ std::string name_;
+ unsigned int attributes_;
+ Expression* start_;
+ Expression* length_;
+ uint64_t current_vma_offset_;
+ uint64_t current_lma_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_;
+};
+
+// 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
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;
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; }
+
+ std::string
+ get_section_name(void) const
+ { return this->name_; }
+
private:
static const char*
script_section_type_name(Script_section_type);
const char* file_name,
const char* section_name,
Output_section*** slot,
- Script_sections::Section_type *psection_type)
+ Script_sections::Section_type* psection_type)
{
// Ask each element whether it matches NAME.
for (Output_section_elements::const_iterator p = this->elements_.begin();
// Return the name of a script section type.
const char*
-Output_section_definition::script_section_type_name (
+Output_section_definition::script_section_type_name(
Script_section_type script_section_type)
{
switch (script_section_type)
}
}
+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
fprintf(f, ";\n");
}
+// Add a memory region.
+
+void
+Script_sections::add_memory_region(const char* name, size_t namelen,
+ unsigned int attributes,
+ Expression* start, Expression* length)
+{
+ if (this->memory_regions_ == NULL)
+ this->memory_regions_ = new Memory_regions();
+ else if (this->find_memory_region(name, namelen))
+ {
+ gold_error (_("region '%.*s' already defined"), static_cast<int>(namelen),
+ name);
+ // FIXME: Add a GOLD extension to allow multiple regions with the same
+ // name. This would amount to a single region covering disjoint blocks
+ // of memory, which is useful for embedded devices.
+ }
+
+ // FIXME: Check the length and start values. Currently we allow
+ // non-constant expressions for these values, whereas LD does not.
+
+ // FIXME: Add a GOLD extension to allow NEGATIVE LENGTHS. This would
+ // describe a region that packs from the end address going down, rather
+ // than the start address going up. This would be useful for embedded
+ // devices.
+
+ this->memory_regions_->push_back(new Memory_region(name, namelen, attributes,
+ start, length));
+}
+
+// Find a memory region.
+
+Memory_region*
+Script_sections::find_memory_region(const char* name, size_t namelen)
+{
+ if (this->memory_regions_ == NULL)
+ return NULL;
+
+ for (Memory_regions::const_iterator m = this->memory_regions_->begin();
+ m != this->memory_regions_->end();
+ ++m)
+ if ((*m)->name_match(name, namelen))
+ return *m;
+
+ return NULL;
+}
+
+// Find a memory region's origin.
+
+Expression*
+Script_sections::find_memory_region_origin(const char* name, size_t namelen)
+{
+ Memory_region* mr = find_memory_region(name, namelen);
+ if (mr == NULL)
+ return NULL;
+
+ return mr->start_address();
+}
+
+// Find a memory region's length.
+
+Expression*
+Script_sections::find_memory_region_length(const char* name, size_t namelen)
+{
+ Memory_region* mr = find_memory_region(name, namelen);
+ if (mr == NULL)
+ return NULL;
+
+ return mr->length();
+}
+
+// Set the memory region to use for the current section.
+
+void
+Script_sections::set_memory_region(Memory_region* mr, bool set_vma)
+{
+ gold_assert(!this->sections_elements_->empty());
+ this->sections_elements_->back()->set_memory_region(mr, set_vma);
+}
+
// Class Script_sections.
Script_sections::Script_sections()
in_sections_clause_(false),
sections_elements_(NULL),
output_section_(NULL),
+ memory_regions_(NULL),
phdrs_elements_(NULL),
orphan_section_placement_(NULL),
data_segment_align_start_(),
Script_sections::start_output_section(
const char* name,
size_t namelen,
- const Parser_output_section_header *header)
+ const Parser_output_section_header* header)
{
Output_section_definition* posd = new Output_section_definition(name,
namelen,
const char* file_name,
const char* section_name,
Output_section*** output_section_slot,
- Script_sections::Section_type *psection_type)
+ Script_sections::Section_type* psection_type)
{
for (Sections_elements::const_iterator p = this->sections_elements_->begin();
p != this->sections_elements_->end();
{
gold_assert(this->saw_sections_clause_);
+ // Walk the memory regions specified in this script, if any.
+ if (this->memory_regions_ != NULL)
+ {
+ for (Memory_regions::const_iterator mr = this->memory_regions_->begin();
+ mr != this->memory_regions_->end();
+ ++mr)
+ {
+ // FIXME: What should we do with the attributes of the regions ?
+
+ // For each region, set the VMA of the sections associated with it.
+ for (Memory_region::Section_list::const_iterator s =
+ (*mr)->get_vma_section_list_start();
+ s != (*mr)->get_vma_section_list_end();
+ ++s)
+ {
+ (*s)->set_section_vma((*mr)->get_current_vma_address());
+ (*mr)->increment_vma_offset((*s)->get_section_name(),
+ (*s)->get_output_section()->current_data_size(),
+ symtab, layout);
+ }
+
+ // Similarly, set the LMA values.
+ for (Memory_region::Section_list::const_iterator s =
+ (*mr)->get_lma_section_list_start();
+ s != (*mr)->get_lma_section_list_end();
+ ++s)
+ {
+ (*s)->set_section_lma((*mr)->get_current_lma_address());
+ (*mr)->increment_lma_offset((*s)->get_section_name(),
+ (*s)->get_output_section()->current_data_size(),
+ symtab, layout);
+ }
+ }
+ }
+
// Implement ONLY_IF_RO/ONLY_IF_RW constraints. These are a pain
// for our representation.
for (Sections_elements::iterator p = this->sections_elements_->begin();
p != this->sections_elements_->end();
++p)
{
- Output_section *os = (*p)->get_output_section();
+ Output_section* os = (*p)->get_output_section();
if (os != NULL && (os->flags() & elfcpp::SHF_TLS) != 0)
{
if (first_tls == NULL)
void
Script_sections::print(FILE* f) const
{
+ if (this->phdrs_elements_ != NULL)
+ {
+ fprintf(f, "PHDRS {\n");
+ for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin();
+ p != this->phdrs_elements_->end();
+ ++p)
+ (*p)->print(f);
+ fprintf(f, "}\n");
+ }
+
+ if (this->memory_regions_ != NULL)
+ {
+ fprintf(f, "MEMORY {\n");
+ for (Memory_regions::const_iterator m = this->memory_regions_->begin();
+ m != this->memory_regions_->end();
+ ++m)
+ (*m)->print(f);
+ fprintf(f, "}\n");
+ }
+
if (!this->saw_sections_clause_)
return;
(*p)->print(f);
fprintf(f, "}\n");
-
- if (this->phdrs_elements_ != NULL)
- {
- fprintf(f, "PHDRS {\n");
- for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin();
- p != this->phdrs_elements_->end();
- ++p)
- (*p)->print(f);
- fprintf(f, "}\n");
- }
}
} // End namespace gold.
projects / binutils-gdb.git / blobdiff