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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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Documentation/kbuild: Document storage of symbol information

Document where exported and imported symbols are kept, format options,
and limitations.

Signed-off-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

authored by

Matthew Maurer and committed by
Masahiro Yamada 272f8a6d e8639b7e

+20
+20
Documentation/kbuild/modules.rst
··· 423 423 1) It lists all exported symbols from vmlinux and all modules. 424 424 2) It lists the CRC if CONFIG_MODVERSIONS is enabled. 425 425 426 + Version Information Formats 427 + --------------------------- 428 + 429 + Exported symbols have information stored in __ksymtab or __ksymtab_gpl 430 + sections. Symbol names and namespaces are stored in __ksymtab_strings, 431 + using a format similar to the string table used for ELF. If 432 + CONFIG_MODVERSIONS is enabled, the CRCs corresponding to exported 433 + symbols will be added to the __kcrctab or __kcrctab_gpl. 434 + 435 + If CONFIG_BASIC_MODVERSIONS is enabled (default with 436 + CONFIG_MODVERSIONS), imported symbols will have their symbol name and 437 + CRC stored in the __versions section of the importing module. This 438 + mode only supports symbols of length up to 64 bytes. 439 + 440 + If CONFIG_EXTENDED_MODVERSIONS is enabled (required to enable both 441 + CONFIG_MODVERSIONS and CONFIG_RUST at the same time), imported symbols 442 + will have their symbol name recorded in the __version_ext_names 443 + section as a series of concatenated, null-terminated strings. CRCs for 444 + these symbols will be recorded in the __version_ext_crcs section. 445 + 426 446 Symbols and External Modules 427 447 ---------------------------- 428 448