ret in llext_load() is always assigned before use, remove its
redundant initialisation.
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
The memory usage shown in the shell was 0 which is obviously incorrect.
At some point the memory allocation tracking was dropped from llext.c
mistakenly. Add it back.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
This has several advantages:
1. we don't need any hard assumptions about symbol length. The
current hard-coded limit of 32 characters might well be not true.
2. replaces a lot of code for reading those names with a single
call to a 1-line function to calculate string location.
3. eliminates the need to allocate buffers for exported symbol names
by replacing them with a simple pointer assignment.
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Instead of first allocating all sections and then copying then,
create a helper function to allocate and copy a single section and
call it for all appropriate sections. We need to call this function
from another location when copying string sections.
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
In llext_copy_symbols the check after llext_read
was looking the result of llext_seek operation instead
of the read.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
When relocating section symbol addresses the value where the
relocation is to be written is an offset into the section to load.
Simply rewriting it with the section address is not enough, we need
to write the address of the section with the offset into it.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
Adds the linkable loadable extensions (llext) subsystem which provides
functionality for reading, parsing, and linking ELF encoded executable
code into a managed extension to the running elf base image.
A loader interface, and default buffer loader implementation,
make available to the llext subsystem the elf data. A simple management
API provide the ability to load and unload extensions as needed. A shell
interface for extension loading and unloading makes it easy to try.
Adds initial support for armv7 thumb built elfs with very specific
compiler flags.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
Co-authored-by: Chen Peng1 <peng1.chen@intel.com>
Co-authored-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
