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llext: add support for SLID-based linking

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This commit introduces support for an alternate linking method in the
LLEXT subsystem, called "SLID" (short for Symbol Link Identifier),
enabled by the CONFIG_LLEXT_EXPORT_BUILTINS_BY_SLID Kconfig option.

SLID-based linking uses a unique identifier (integer) to identify
exported symbols, instead of using the symbol name as done currently.
This approach provides several benefits:
 * linking is faster because the comparison operation to determine
   whether we found the correct symbol in the export table is now an
   integer compare, instead of a string compare
 * binary size is reduced as symbol names can be dropped from the binary
 * confidentiality is improved as a side-effect, as symbol names are no
   longer present in the binary

Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>
This commit is contained in:
Mathieu Choplain 2024-05-06 13:03:26 +02:00 • committed by Anas Nashif
commit 8aa6ae43ce
45 changed files with 981 additions and 7 deletions
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4
soc/openisa/rv32m1/linker.ld
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@ -87,6 +87,10 @@ SECTIONS
#include <zephyr/linker/rel-sections.ld>
#ifdef CONFIG_LLEXT
#include <zephyr/linker/llext-sections.ld>
#endif
SECTION_PROLOGUE(.plt,,)
{
*(.plt)