package linksem

shn_loreserve: this specifies the lower bound of the range of reserved * indices.

shn_loproc: start of the range reserved for processor-specific semantics.

shn_loproc: start of the range reserved for processor-specific semantics.

shn_hiproc: end of the range reserved for processor-specific semantics.

shn_hiproc: end of the range reserved for processor-specific semantics.

shn_loos: start of the range reserved for operating system-specific * semantics.

shn_loos: start of the range reserved for operating system-specific * semantics.

shn_hios: end of the range reserved for operating system-specific * semantics.

shn_hios: end of the range reserved for operating system-specific * semantics.

shn_abs: specifies the absolute values for the corresponding reference. * Symbols defined relative to section number shn_abs have absolute values * and are not affected by relocation.

shn_abs: specifies the absolute values for the corresponding reference. * Symbols defined relative to section number shn_abs have absolute values * and are not affected by relocation.

shn_common: symbols defined relative to this index are common symbols, * such as unallocated C external variables.

shn_common: symbols defined relative to this index are common symbols, * such as unallocated C external variables.

shn_hireserve: specifies the upper-bound of reserved values.

string_of_special_section_index m produces a string-based representation * of a section header entry's special section index, m.

Marks the section header as being inactive.

Section holds information defined by the program.

Section holds information defined by the program.

The following two section types hold a symbol table. An object file may only * have one symbol table of each of the respective types. The symtab provides * a place for link editing, whereas the dynsym section holds a minimal set of * dynamic linking symbols

The following two section types hold a symbol table. An object file may only * have one symbol table of each of the respective types. The symtab provides * a place for link editing, whereas the dynsym section holds a minimal set of * dynamic linking symbols

Section holds a string table

Section holds a string table

Section holds relocation entries with explicit addends. An object file may * have multiple section of this type.

Section holds relocation entries with explicit addends. An object file may * have multiple section of this type.

Section holds a symbol hash table. An object file may only have a single * hash table.

Section holds a symbol hash table. An object file may only have a single * hash table.

Section holds information for dynamic linking. An object file may only have * a single dynamic section.

Section holds information for dynamic linking. An object file may only have * a single dynamic section.

Section holds information that marks the file in some way.

Section holds information that marks the file in some way.

Section occupies no space in the file but otherwise resembles a progbits * section.

Section occupies no space in the file but otherwise resembles a progbits * section.

Section holds relocation entries without explicit addends. An object file * may have multiple section of this type.

Section holds relocation entries without explicit addends. An object file * may have multiple section of this type.

Section type is reserved but has an unspecified meaning.

Section type is reserved but has an unspecified meaning.

Section contains an array of pointers to initialisation functions. Each * pointer is taken as a parameterless function with a void return type.

Section contains an array of pointers to initialisation functions. Each * pointer is taken as a parameterless function with a void return type.

Section contains an array of pointers to termination functions. Each * pointer is taken as a parameterless function with a void return type.

Section contains an array of pointers to termination functions. Each * pointer is taken as a parameterless function with a void return type.

Section contains an array of pointers to initialisation functions that are * invoked before all other initialisation functions. Each * pointer is taken as a parameterless function with a void return type.

Section contains an array of pointers to initialisation functions that are * invoked before all other initialisation functions. Each * pointer is taken as a parameterless function with a void return type.

Section defines a section group, i.e. a set of sections that are related and * must be treated especially by the linker. May only appear in relocatable * objects.

Section defines a section group, i.e. a set of sections that are related and * must be treated especially by the linker. May only appear in relocatable * objects.

Section is associated with sections of type SHT_SYMTAB and is required if * any of the section header indices referenced by that symbol table contains * the escape value SHN_XINDEX. * * FIXME: Lem bug as int type used throughout Lem codebase, rather than * BigInt.t, so Lem chokes on these large constants below, hence the weird * way in which they are written.

Section is associated with sections of type SHT_SYMTAB and is required if * any of the section header indices referenced by that symbol table contains * the escape value SHN_XINDEX. * * FIXME: Lem bug as int type used throughout Lem codebase, rather than * BigInt.t, so Lem chokes on these large constants below, hence the weird * way in which they are written.

The following ranges are reserved solely for OS-, processor- and user- * specific semantics, respectively.

string_of_section_type os proc user i produces a string-based representation * of section type i. Some section types are defined by ABI-specific supplements * in reserved ranges, in which case the functions os, proc and user are * used to produce the string.

The section contains data that should be writable during program execution.

The section occupies memory during program execution.

The section occupies memory during program execution.

The section contains executable instructions.

The section contains executable instructions.

The data in the section may be merged to reduce duplication. Each section * is compared based on name, type and flags set with sections with identical * values at run time being mergeable.

The data in the section may be merged to reduce duplication. Each section * is compared based on name, type and flags set with sections with identical * values at run time being mergeable.

The section contains null-terminated character strings.

The section contains null-terminated character strings.

The info field of this section header contains a section header table * index.

The info field of this section header contains a section header table * index.

Adds special link ordering for link editors.

Adds special link ordering for link editors.

This section requires special OS-specific processing beyond the standard * link rules.

This section requires special OS-specific processing beyond the standard * link rules.

This section is a member (potentially the only member) of a link group.

This section is a member (potentially the only member) of a link group.

This section contains Thread Local Storage (TLS) meaning that each thread of * execution has its own instance of this data.

This section contains Thread Local Storage (TLS) meaning that each thread of * execution has its own instance of this data.

This section contains compressed data. Compressed data may not be marked as * allocatable.

This section contains compressed data. Compressed data may not be marked as * allocatable.

All bits included in these masks are reserved for OS and processor specific * semantics respectively.

All bits included in these masks are reserved for OS and processor specific * semantics respectively.

string_of_section_flags os proc f produces a string based representation * of section flag f. Some section flags are defined by the ABI and are in * reserved ranges, in which case the flag string is produced by functions * os and proc. * TODO: add more as validation tests require them.

Type elf32_compression_header provides information about the compression and * decompression of compressed sections. All compressed sections on ELF32 begin * with an elf32_compression_header entry.

Type elf64_compression_header provides information about the compression and * decompression of compressed sections. All compressed sections on ELF64 begin * with an elf64_compression_header entry.

This section is compressed with the ZLIB algorithm. The compressed data begins * at the first byte immediately following the end of the compression header.

Values in these ranges are reserved for OS-specific semantics.

Values in these ranges are reserved for processor-specific semantics.

read_elf32_compression_header ed bs0 reads an elf32_compression_header * entry from byte sequence bs0, interpreting bs0 with endianness ed. * Also returns the suffix of bs0 after reading in the compression header. * Fails if the header cannot be read.

read_elf64_compression_header ed bs0 reads an elf64_compression_header * entry from byte sequence bs0, interpreting bs0 with endianness ed. * Also returns the suffix of bs0 after reading in the compression header. * Fails if the header cannot be read.

elf32_section_header_table_entry is the type of entries in the section * header table in 32-bit ELF files. Each entry in the table details a section * in the body of the ELF file.

compare_elf32_section_header_table_entry ent1 ent2 is an ordering comparison * function on section header table entries suitable for use in constructing * sets, finite maps and other ordered data types.

elf64_section_header_table_entry is the type of entries in the section * header table in 64-bit ELF files. Each entry in the table details a section * in the body of the ELF file.

compare_elf64_section_header_table_entry ent1 ent2 is an ordering comparison * function on section header table entries suitable for use in constructing * sets, finite maps and other ordered data types.

Type elf32_section_header_table represents a section header table for 32-bit * ELF files. A section header table is an array (implemented as a list, here) * of section header table entries.

Type elf64_section_header_table represents a section header table for 64-bit * ELF files. A section header table is an array (implemented as a list, here) * of section header table entries.

bytes_of_elf32_section_header_table_entry ed ent blits ent to a byte sequence * assuming endianness ed.

read_elf32_section_header_table_entry ed bs0 reads a section header table * entry from bs0 assuming endianness ed. Also returns the suffix of bs0 * after parsing. Fails if the entry cannot be read.

bytes_of_elf64_section_header_table_entry ed ent blits ent to a byte sequence * assuming endianness ed.

read_elf64_section_header_table_entry ed bs0 reads a section header table * entry from bs0 assuming endianness ed. Also returns the suffix of bs0 * after parsing. Fails if the entry cannot be read.

bytes_of_elf32_section_header_table ed tbl blits section header table tbl * to a byte sequence assuming endianness ed.

bytes_of_elf64_section_header_table ed tbl blits section header table tbl * to a byte sequence assuming endianness ed.

read_elf32_section_header_table' ed bs0 parses an ELF32 section header table * from byte sequence bs0 assuming endianness ed. Assumes bs0 is of the * exact length required to parse the entire table. * Fails if any of the section header table entries cannot be parsed.

read_elf64_section_header_table' ed bs0 parses an ELF64 section header table * from byte sequence bs0 assuming endianness ed. Assumes bs0 is of the * exact length required to parse the entire table. * Fails if any of the section header table entries cannot be parsed.

read_elf32_section_header_table sz ed bs0 parses an ELF32 section header * table from a sz sized prefix of byte sequence bs0 assuming endianness * ed. The suffix of bs0 remaining after parsing is also returned. * Fails if any of the section header entries cannot be parsed or if sz is * greater than the length of bs0.

read_elf64_section_header_table sz ed bs0 parses an ELF64 section header * table from a sz sized prefix of byte sequence bs0 assuming endianness * ed. The suffix of bs0 remaining after parsing is also returned. * Fails if any of the section header entries cannot be parsed or if sz is * greater than the length of bs0.

TODO: what is going on here?

TODO: what is going on here?

is_elf32_addr_addralign_correct ent checks whether an internal address * alignment constraint is met on section header table ent. * TODO: needs tweaking to add in power-of-two constraint, too.

is_elf64_addr_addralign_correct ent checks whether an internal address * alignment constraint is met on section header table ent. * TODO: needs tweaking to add in power-of-two constraint, too.

is_valid_elf32_section_header_table sht checks whether all entries of * section header table sht are valid.

is_valid_elf64_section_header_table sht checks whether all entries of * section header table sht are valid.

The sht_print_bundle type is used to tidy up other type signatures. Some of the * top-level string_of_ functions require six or more functions passed to them, * which quickly gets out of hand. This type is used to reduce that complexity. * The first component of the type is an OS specific print function, the second is * a processor specific print function.

string_of_elf32_section_header_table_entry sht ent produces a string * representation of section header table entry ent using sht, a * sht_print_bundle. * OCaml specific definition.

string_of_elf64_section_header_table_entry sht ent produces a string * representation of section header table entry ent using sht, a * sht_print_bundle. * OCaml specific definition.

string_of_elf32_section_header_table_entry' sht stab ent produces a string * representation of section header table entry ent using sht and section * header string table stab to print the name of the section header entry * correctly. * OCaml specific definition.

string_of_elf64_section_header_table_entry' sht stab ent produces a string * representation of section header table entry ent using sht and section * header string table stab to print the name of the section header entry * correctly. * OCaml specific definition.

elf32_tbss_special shdr seg implements the ELF_TBSS_SPECIAL macro from readelf: * * #define ELF_TBSS_SPECIAL(sec_hdr, segment) \ * (((sec_hdr)->sh_flags & SHF_TLS) != 0 \ * && (sec_hdr)->sh_type == SHT_NOBITS \ * && (segment)->p_type != PT_TLS) * * From readelf source code, file internal.h. *

elf64_tbss_special shdr seg implements the ELF_TBSS_SPECIAL macro from readelf: * * #define ELF_TBSS_SPECIAL(sec_hdr, segment) \ * (((sec_hdr)->sh_flags & SHF_TLS) != 0 \ * && (sec_hdr)->sh_type == SHT_NOBITS \ * && (segment)->p_type != PT_TLS) * * From readelf source code, file internal.h. *

get_elf32_section_to_segment_mapping hdr sht pht isin stbl computes the * section to segment mapping for an ELF file using information in the section * header table sht, program header table pht and file header hdr. A * string table stbl is taken to produce the string output. The test whether * a section lies withing a segment is ABI specific, so isin is used to perform * the test.

get_elf64_section_to_segment_mapping hdr sht pht isin stbl computes the * section to segment mapping for an ELF file using information in the section * header table sht, program header table pht and file header hdr. A * string table stbl is taken to produce the string output. The test whether * a section lies withing a segment is ABI specific, so isin is used to perform * the test.

This is a COMDAT group and may duplicate other COMDAT groups in other object * files.

Any bits in the following mask ranges are reserved exclusively for OS and * processor specific semantics, respectively.

obtain_elf32_section_group_indices endian sht bs0 extracts all section header * table indices of sections that are marked as being part of a section group.

obtain_elf64_section_group_indices endian sht bs0 extracts all section header * table indices of sections that are marked as being part of a section group.

obtain_elf32_tls_template sht extracts the TLS template (i.e. all sections * in section header table sht that have their TLS flag bit set).

obtain_elf64_tls_template sht extracts the TLS template (i.e. all sections * in section header table sht that have their TLS flag bit set).

obtain_elf32_hash_table endian sht bs0 extracts a hash table from an ELF file * providing a section of type SHT_HASH exists in section header table sht. * Extraction is from byte sequence bs0 assuming endianness endian. The * return type represents the number of buckets, the number of chains, the buckets * and finally the chains.

obtain_elf64_hash_table endian sht bs0 extracts a hash table from an ELF file * providing a section of type SHT_HASH exists in section header table sht. * Extraction is from byte sequence bs0 assuming endianness endian. The * return type represents the number of buckets, the number of chains, the buckets * and finally the chains.

construct_special_sections contains a finite map from section name (as * a string) to the expected attributes and flags expected of that section, * as specified in the ELF specification. * NOTE: some of these are overriden by the ABI.