Re: Query on linker scripts

March 24, 2012

      On 24/03/2012 05:43, Vaibhav Jain wrote:
...
Hi,
[cut]
is confusing. An example is the use of symbols sbss and ebss in the bss
section as show in the script below
ENTRY (loader)
SECTIONS
{
     . = 0x00100000;
     .text ALIGN (0x1000) :
     {
         *(.text)
     }
     .rodata ALIGN (0x1000) :
     {
         *(.rodata*)
     }
     .data ALIGN (0x1000) :
     {
         *(.data)
     }
     .bss :
     {
         sbss = .;
         *(COMMON)
         *(.bss)
         ebss = .;
     }
}
I'm not sure if you are OT, anyway...

i.e. they are useful if you want to clear the bss section before execution.

[snippet for ARM proc]
...
	ldr	r2, =_sbss
	b	LoopFillZerobss
/* Zero fill the bss segment. */
FillZerobss:
	movs	r3, #0
	str	r3, [r2], #4

LoopFillZerobss:
	ldr	r3, = _ebss
	cmp	r2, r3
	bcc	FillZerobss
...

--
Carlo Caione