// script-sections.h -- linker script SECTIONS for gold -*- C++ -*-
-// Copyright 2008 Free Software Foundation, Inc.
+// Copyright (C) 2008-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#define GOLD_SCRIPT_SECTIONS_H
#include <cstdio>
+#include <list>
#include <vector>
namespace gold
struct Input_section_spec;
class Expression;
class Sections_element;
+class Memory_region;
+class Phdrs_element;
+class Output_data;
class Output_section_definition;
+class Output_section;
+class Output_segment;
+class Orphan_section_placement;
class Script_sections
{
public:
+ // This is a list, not a vector, because we insert orphan sections
+ // in the middle.
+ typedef std::list<Sections_element*> Sections_elements;
+
+ // Logical script section types. We map section types returned by the
+ // parser into these since some section types have the same semantics.
+ enum Section_type
+ {
+ // No section type specified.
+ ST_NONE,
+ // Section is NOLOAD. We allocate space in the output but section
+ // is not loaded in runtime.
+ ST_NOLOAD,
+ // No space is allocated to section.
+ ST_NOALLOC
+ };
+
Script_sections();
// Start a SECTIONS clause.
in_sections_clause() const
{ return this->in_sections_clause_; }
+ // Return whether we ever saw a PHDRS clause. We ignore the PHDRS
+ // clause unless we also saw a SECTIONS clause.
+ bool
+ saw_phdrs_clause() const
+ { return this->saw_sections_clause_ && this->phdrs_elements_ != NULL; }
+
// Start processing entries for an output section.
void
start_output_section(const char* name, size_t namelen,
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);
void
add_input_section(const Input_section_spec* spec, bool keep);
+ // Saw DATA_SEGMENT_ALIGN.
+ void
+ data_segment_align();
+
+ // Saw DATA_SEGMENT_RELRO_END.
+ void
+ data_segment_relro_end();
+
+ // Create any required sections.
+ void
+ create_sections(Layout*);
+
+ // Add any symbols we are defining to the symbol table.
+ void
+ add_symbols_to_table(Symbol_table*);
+
+ // Finalize symbol values and check assertions.
+ void
+ finalize_symbols(Symbol_table* symtab, const Layout* layout);
+
+ // Find the name of the output section to use for an input file name
+ // and section name. This returns a name, and sets
+ // *OUTPUT_SECTION_SLOT to point to the address where the actual
+ // output section may be stored.
+ // 1) If the input section should be discarded, this returns NULL
+ // and sets *OUTPUT_SECTION_SLOT to NULL.
+ // 2) If the input section is mapped by the SECTIONS clause, this
+ // returns the name to use for the output section (in permanent
+ // storage), and sets *OUTPUT_SECTION_SLOT to point to where the
+ // output section should be stored. **OUTPUT_SECTION_SLOT will be
+ // non-NULL if we have seen this output section already.
+ // 3) If the input section is not mapped by the SECTIONS clause,
+ // this returns SECTION_NAME, and sets *OUTPUT_SECTION_SLOT to
+ // NULL.
+ // PSCRIPT_SECTION_TYPE points to a location for returning the section
+ // type specified in script. This can be SCRIPT_SECTION_TYPE_NONE if
+ // no type is specified.
+ // *KEEP indicates whether the section should survive garbage collection.
+ // MATCH_INPUT_SPEC indicates whether the section should be matched
+ // with input section specs or simply against the output section name
+ // (i.e., for linker-created sections like .dynamic).
+ const char*
+ output_section_name(const char* file_name, const char* section_name,
+ Output_section*** output_section_slot,
+ Section_type* pscript_section_type,
+ bool* keep, bool match_input_spec);
+
+ // Place a marker for an orphan output section into the SECTIONS
+ // clause.
+ void
+ place_orphan(Output_section* os);
+
+ // Set the addresses of all the output sections. Return the segment
+ // which holds the file header and segment headers, if any.
+ Output_segment*
+ set_section_addresses(Symbol_table*, Layout*);
+
+ // Add a program header definition.
+ void
+ add_phdr(const char* name, size_t namelen, unsigned int type,
+ bool filehdr, bool phdrs, bool is_flags_valid, unsigned int flags,
+ Expression* load_address);
+
+ // Return the number of segments we expect to create based on the
+ // SECTIONS clause.
+ size_t
+ expected_segment_count(const Layout*) const;
+
+ // Add the file header and segment header to non-load segments as
+ // specified by the PHDRS clause.
+ void
+ put_headers_in_phdrs(Output_data* file_header, Output_data* segment_headers);
+
+ // 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* name, uint64_t* address,
+ uint64_t* load_address, uint64_t* addralign,
+ uint64_t* size) const;
+
+ // Release all Output_segments. This is used in relaxation.
+ void
+ release_segments();
+
+ // Whether we ever saw a SEGMENT_START expression, the presence of which
+ // changes the behaviour of -Ttext, -Tdata and -Tbss options.
+ bool
+ saw_segment_start_expression() const
+ { return this->saw_segment_start_expression_; }
+
+ // Set the flag which indicates whether we saw a SEGMENT_START expression.
+ void
+ set_saw_segment_start_expression(bool value)
+ { this->saw_segment_start_expression_ = value; }
+
+ // Add a memory region.
+ void
+ add_memory_region(const char*, size_t, unsigned int,
+ Expression*, Expression*);
+
+ // Find a memory region's origin.
+ Expression*
+ find_memory_region_origin(const char*, size_t);
+
+ // Find a memory region's length.
+ Expression*
+ find_memory_region_length(const char*, size_t);
+
+ // Find a memory region by name.
+ Memory_region*
+ find_memory_region(const char*, size_t);
+
+ // Find a memory region that should be used by a given output section.
+ Memory_region*
+ find_memory_region(Output_section_definition*, bool, bool,
+ Output_section_definition**);
+
+ // Returns true if the provide block of memory is contained
+ // within a memory region.
+ bool
+ block_in_region(Symbol_table*, Layout*, uint64_t, uint64_t) const;
+
+ // Set the memory region of the section.
+ void
+ set_memory_region(Memory_region*, bool);
+
// Print the contents to the FILE. This is for debugging.
void
print(FILE*) const;
+ // Used for orphan sections.
+ typedef Sections_elements::iterator Elements_iterator;
+
private:
- typedef std::vector<Sections_element*> Sections_elements;
+ typedef std::vector<Memory_region*> Memory_regions;
+ typedef std::vector<Phdrs_element*> Phdrs_elements;
+
+ // Create segments.
+ Output_segment*
+ create_segments(Layout*, uint64_t);
+
+ // Create PT_NOTE and PT_TLS segments.
+ void
+ create_note_and_tls_segments(Layout*, const std::vector<Output_section*>*);
+
+ // Return whether the section is a BSS section.
+ static bool
+ is_bss_section(const Output_section*);
+
+ // Return the total size of the headers.
+ size_t
+ total_header_size(Layout* layout) const;
+
+ // Return the amount we have to subtract from the LMA to accommodate
+ // headers of the given size.
+ uint64_t
+ header_size_adjustment(uint64_t lma, size_t sizeof_headers) const;
+
+ // Create the segments from a PHDRS clause.
+ Output_segment*
+ create_segments_from_phdrs_clause(Layout* layout, uint64_t);
+
+ // Attach sections to segments from a PHDRS clause.
+ void
+ attach_sections_using_phdrs_clause(Layout*);
+
+ // Set addresses of segments from a PHDRS clause.
+ Output_segment*
+ set_phdrs_clause_addresses(Layout*, uint64_t);
// True if we ever saw a SECTIONS clause.
bool saw_sections_clause_;
Sections_elements* sections_elements_;
// The current output section, if there is one.
Output_section_definition* output_section_;
+ // The list of memory regions in the MEMORY clause.
+ Memory_regions* memory_regions_;
+ // The list of program headers in the PHDRS clause.
+ Phdrs_elements* phdrs_elements_;
+ // Where to put orphan sections.
+ Orphan_section_placement* orphan_section_placement_;
+ // A pointer to the last Sections_element when we see
+ // DATA_SEGMENT_ALIGN.
+ Sections_elements::iterator data_segment_align_start_;
+ // Whether we have seen DATA_SEGMENT_ALIGN.
+ bool saw_data_segment_align_;
+ // Whether we have seen DATA_SEGMENT_RELRO_END.
+ bool saw_relro_end_;
+ // Whether we have seen SEGMENT_START.
+ bool saw_segment_start_expression_;
+ // Whether we have created all necessary segments.
+ bool segments_created_;
+};
+
+// Attributes for memory regions.
+enum
+{
+ MEM_EXECUTABLE = (1 << 0),
+ MEM_WRITEABLE = (1 << 1),
+ MEM_READABLE = (1 << 2),
+ MEM_ALLOCATABLE = (1 << 3),
+ MEM_INITIALIZED = (1 << 4),
+ MEM_ATTR_MASK = (1 << 5) - 1
};
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff