The commits that follow teach the ELF loader to load an FDPIC object. This
puts the option they hang off and the definitions they share in one place
first, so each of them builds on its own.
CONFIG_FDPIC depends on ARCH_HAVE_ELF_FDPIC, which an architecture selects
when it has a PIC base register and the FDPIC relocations. Only armv7-m
and armv8-m select it today, and it defaults off, so nothing changes for
anyone who does not ask for it.
include/nuttx/fdpic.h holds what both sides of the loader need: the two
word function descriptor an FDPIC module passes instead of a code address,
the test for whether the caller is such a module, and the call sequence
that enters one with its own data base. All of it is behind CONFIG_FDPIC,
thus the header is empty without it and a file may include it
unconditionally.
The call sequence itself is architecture specific, so arch/arm/include/arch.h
supplies it as up_fdpic_invoke(), beside the other PIC base register macros.
up_setpicbase() cannot serve here: the register has to hold the module's
base for exactly one call and then go back, and nothing in C tells the
compiler the register is live across that call, so the save, the install,
the branch and the restore have to be one sequence.
Built for mps3-an547:bl and mps3-an547:picostest, with CONFIG_FDPIC off,
which is every configuration in the tree.
Assisted-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
This flag can be used to store the filename of a loaded module or
executable in binfmt. The filename is useful for example in debugging.
For example, gdb or a jtag debugger can be configured to automatically
fetch the symbols for the currently executing module.
Signed-off-by: Jukka Laitinen <jukka.laitinen@tii.ae>
Renaming "modlib" to "libelf" is more in line with the implementation content,
which makes it easier for individual developers to understand the capabilities of this module.
CONFIG_LIBC_MODLIB -> CONFIG_LIBC_ELF
Signed-off-by: chao an <anchao.archer@bytedance.com>
test:
1.use mps3-an547 build helloxx as module and run it
2.use qemu-armv7a:knsh test kernel build helloxx and run it
Signed-off-by: anjiahao <anjiahao@xiaomi.com>
since bootloader may call modlib functions directly
to load elf firmware without binfmt, dlfcn or module.
BTW, this patch also remove the duplicated selecttion
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
maintains the same semantics as Kernel’s module build
and compatible with Kconfiglib implementation.
The problem of kconfiglib not being able to use tri-states is this:
linux is here torvalds/linux@6dd85ff
The module option is extracted from one of the triate three states into a MODULE keyword.
Kconfiglib supports the default implementation of module to be MODULE for compatibility with the linux kernel, and triate degenerates into bool two states
Refer to this code: 061e71f7d7/kconfiglib.py (L4274-L4284)
Signed-off-by: xuxin19 <xuxin19@xiaomi.com>
Using up_textheap_memalign to allocate memory if arch support textheap
for loading section.
The default system heap does not support execution permissions,
so up_textheap_memalign allocation is required.
this patch can fix issue about #11043
update esp32 elf config:
remove -CONFIG_ARCH_USE_TEXT_HEAP=y becuase ARCH_CHIP_ESP32 select
ARCH_HAVE_TEXT_HEAP
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
This change allows boards to define an additional kconfig option, which specifies the final link format of application executables.
By selecting `CONFIG_BINFMT_ELF_RELOCATABLE`, and providing an appropriate linker script, applications can be fully linked, removing the need to process relocations.
When CONFIG_SYMTAB_ORDEREDBYNAME is selected most code will use
the ordered search function. When it is not selected no code will
use the ordered search function. This change merges the two
functions and varies its behaviour based on the config setting,
such that all callers can simply call the one search function
and get the best behaviour.
An additional configuration option allows leading underscores to
be stripped from symbols being relocated in loaded objects. This
allows toolchains which prefix C symbol with underscores to make
loadable ELF objects.
Squashed commit of the following:
Correct some additional compile-related issues.
Move include/nuttx/binfmt/builtin.h to include/nuttx/lib/builtin.h. Move apps/builtin/lib_builtin_forindex.c to libs/libc/builtin/lib_builtin_forindex.c.
Move binfmt/libbuiltin to libs/libc/builtin. There are calls made directly from apps/nshlib into this logic and hence, must be part of a library that can be shared between the OS and applications.
1. Move exepath_*() related code to libc/misc
1. Rename exepath_ to envpath_
2. Rename BINFMT_EXEPATH to LIB_ENVPATH
libs/libc/modlib: Add pre module library symbol table support
