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arch/sim: add custom data section support

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The link script of NuttX Simulator is generated through compilation
options. This PR will support configure special data sections in
kconfig to meet the support of 3rd party applications.

we need to follow the syntax of linker script. In 3rd-party applications, some data will be labeled as section:

| a.c:
| struct task_s a __attribute__((section(".data.custom.taska")));
| b.c:
| struct task_s b __attribute__((section(".data.custom.taskb")));

Data of the same type struct can be placed in a fixed location to reduce the overhead caused by searching:

|   .data           :
|   {
|     _custom_data_table_start = .;
|     KEEP(*(.data.custom.*))
|     _custom_data_table_end = .;
|   }

Such section declare can be configured via Kconfig in the PR:

| CONFIG_SIM_CUSTOM_DATA_SECTION=" .data : { _custom_data_table_start = .; KEEP(*(.data.custom.*)) _custom_data_table_end = .; } "

Signed-off-by: chao an <anchao@lixiang.com>
This commit is contained in:
chao an 2024-07-05 00:13:45 +08:00 • committed by Alan Carvalho de Assis
parent b008653ac0
commit 9915b80e30
3 changed files with 13 additions and 1 deletions
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4
CMakeLists.txt
View file

@ -695,7 +695,9 @@ else()
COMMAND
echo ARGS
'__init_array_start = .\; __init_array_end = .\; __fini_array_start = .\; __fini_array_end = .\;'
>> nuttx.ld)
>> nuttx.ld
COMMAND sed -i '/\\.data *:/i " ${CONFIG_SIM_CUSTOM_DATA_SECTION} " '
nuttx.ld)
endif()
# conflicting symbols to rename

7
arch/sim/Kconfig
View file

@ -794,4 +794,11 @@ config SIM_USB_PRIO
endif
config SIM_CUSTOM_DATA_SECTION
string "Custom data section name for Simulator"
default ""
---help---
Custom data section name for Simulator to allow
developer to define special data sections.
endif # ARCH_SIM

3
arch/sim/src/Makefile
View file

@ -414,6 +414,9 @@ ifeq ($(CONFIG_MM_KASAN_GLOBAL),y)
.kasan.global : {KEEP(*(.data..LASAN0)) KEEP (*(.data.rel.local..LASAN0)) }\n \
.interp : {*(.interp)}/g' nuttx.ld
endif
ifneq ($(CONFIG_SIM_CUSTOM_DATA_SECTION),"")
$(Q) sed -i '/\.data *:/i $(subst ",, $(CONFIG_SIM_CUSTOM_DATA_SECTION))' nuttx.ld
endif
ifeq ($(CONFIG_ALLSYMS)$(CONFIG_MM_KASAN_GLOBAL),)
$(if $(CONFIG_HAVE_CXX),\
$(Q) "$(CXX)" $(CFLAGS) $(LDFLAGS) -o $(TOPDIR)/$@ $(HEADOBJ) nuttx.rel $(HOSTOBJS) $(STDLIBS),\