How to access variable define in linker script in c?

Question

In the linker script, I defined PROVIDE(__KERNEL_BEGIN__ = .);.

The address can be accessed from:

extern uint32_t __KERNEL_BEGIN__[];
         


        

Answer 1

This is more in reference to your follow-up question beneath Ryan's post, however it may help answer your original question as well.

"Variables" defined in linker scripts aren't treated the same as those defined in C; they're more symbols than anything. When accessing these symbols defined in your linker scripts, you must use the & operator.

For example, if we had the following section in our linker script:

.data :
{
    _sdata = .;
    *(.data*);
    _edata = .;
} > ram AT >rom

We could get a pointer to the start of the .data section like so:

uint8_t *data_ptr = &_sdata;

For further reading, try the binutils docs, or this excellent primer on linker scripts

Cheers