Macro init_sections

macro_rules! init_sections {
    ($($section_name:ident$(,)?)+) => { ... };
}

Defines pre-init function initializing linker section memory.

This macro accepts linker section names as arguments and assumes the linker symbols are named after given section names prefixed with

• __s for section VMA’s start (usually points to RAM)
• __e for section VMA’s end (usually points to RAM)
• __si for section LMA’s start (usually points to FLASH)

If the symbols in the linker script are named __scustom_data, __ecustom_data and __sicustom_data, as depicted in an example below, the macro call should be

init_sections!(custom_data)

MEMORY
{
    FLASH   : ORIGIN = 0x08000000, LENGTH = 32K
    RAM     : ORIGIN = 0x20000000, LENGTH = 16K
    DATA    : ORIGIN = 0x20004000, LENGTH = 16K
}

SECTIONS
{
    .custom_data : ALIGN(4)
    {
        . = ALIGN(4);
        __scustom_data = .;
        *(.custom_data .custom_data.*);

        . = ALIGN(4);
        __ecustom_data = .;
    } > DATA AT>FLASH

    __sicustom_data = LOADADDR(.custom_data);
} INSERT BEFORE .uninit;

Multiple section names could be passed as

init_sections!(section_a, section_b, section_c);

init_sections!(section_a, section_b, section_c,);

init_sections!(section_a section_b section_c);