arp.rc.ld

/*
arp.{r8,rb,rc}.ld :
These linker scripts (one for each memory density of the stm32f105) are used by
the linker to arrange program symbols and sections in memory. This is especially
important for sections like the interrupt vector, which must be placed where the
processor is hard-coded to look for it.
*/

/*stm32f105 dev board linker script*/

/*
OUTPUT_FORMAT() defines the BFD (binary file descriptor) format
OUTPUT_FORMAT(default, big, little)
*/
OUTPUT_FORMAT ("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
/* ENTRY() defines the symbol at which to begin executing code */
ENTRY(_start)
/* tell ld where to look for archive libraries */
SEARCH_DIR("/home/arp/stm/ctc/arm-eabi/lib")

/*
MEMORY{} defines the memory regions of the target device,
and gives them an alias for use later in the linker script.
*/

/* stm32f105rc */
MEMORY
{
  ram (rwx) : ORIGIN = 0x20000000, LENGTH = 64k
  flash (rx) : ORIGIN = 0x08000000, LENGTH = 256k
  option_bytes_rom (rx) : ORIGIN = 0x1FFFF800, LENGTH = 16
}

_sheap = _ebss + 4;
_sstack = _ebss + 4;
/*placed __stack_base__ trying to figure out
global variable overwrite issue
__stack_base__ = _ebss + 4;*/

_eheap = ORIGIN(ram) + LENGTH(ram) - 1;
_estack = ORIGIN(ram) + LENGTH(ram) - 1;

/* SECTIONS{} defines all the ELF sections we want to create */
SECTIONS
{
	/*
	set . to an initial value (0 here).
	. (dot) is the location counter. New sections are placed at the
	location pointed to by the location counter, and the location counter
	is automatically moved ahead the length of the new section. It is important
	to maintain alignment (not handled automatically by the location counter).
	*/
	. = SEGMENT_START("text-segment", 0);
	


	/*isr_vector contains the interrupt vector.
	
	isr_vector is read only (could be write too?).
	
	isr_vector must appear at start of flash (USR),
	address 0x0800 0000*/
	.isr_vector :
	{
	  . = ALIGN(4);
	  _sisr_vector = .;
	  
	  *(.isr_vector)
	  
	  _eisr_vector = .;
	} >flash
	
	/*text contains executable code.
	
	text is read and execute.*/
	.text :
	{
	  . = ALIGN(4);
	  *(.text)
	  . = ALIGN(4);
	  *(.text.*)
	} >flash
	
	/*init contains constructor functions
	called before entering main. used by crt (?).*/
	.init :
	{
	  . = ALIGN(4);
	  KEEP(*(.init))
	} >flash
	
	/*fini contains destructor functions
	called after leaving main. used by crt (?).*/
	.fini :
	{
	  . = ALIGN(4);
	  KEEP(*(.fini))
	} >flash
	
	/* rodata contains read only data.*/
	.rodata :
	{
	  . = ALIGN(4);
	  *(.rodata)
	  
	  /* sidata contains the initial values
	  for variables in the data section.
	
	  sidata is read only.*/
	  . = ALIGN(4);
	  _sidata = .;
	} >flash
	
	/*data contains all initalized variables.
	
	data is read and write. 
 	.data (NOLOAD) : AT(_sidata)*/
	.data : AT(_sidata)
	{
	  . = ALIGN(4);
	  _sdata = .;
	  
	  *(.data)
	  
	  _edata = .;
	} >ram

	/*bss contains unintialized variables.
	
	bss is read and write.
 	.bss (NOLOAD) :*/
	.bss :
	{
	  . = ALIGN(4);
	  _sbss = .;
	  __bss_start__ = .;
	  
	  *(.bss)
	  . = ALIGN(4);
	  
	  /*COMMON is a special section containing
	  uninitialized data.
	  
	  Example: (declared globally)
	  int temp; //this will appear in COMMON */
	  *(COMMON)
	  
	  _ebss = .;
	  __bss_end__ = .;
	} >ram AT>flash
	
	. = ALIGN(4);
	end = .;
	
	    /* remove the debugging information from the standard libraries */
    DISCARD :
    {
     libc.a ( * )
     libm.a ( * )
     libgcc.a ( * )
     }

    /* Stabs debugging sections.  */
    .stab          0 : { *(.stab) }
    .stabstr       0 : { *(.stabstr) }
    .stab.excl     0 : { *(.stab.excl) }
    .stab.exclstr  0 : { *(.stab.exclstr) }
    .stab.index    0 : { *(.stab.index) }
    .stab.indexstr 0 : { *(.stab.indexstr) }
    .comment       0 : { *(.comment) }
    /* DWARF debug sections.
       Symbols in the DWARF debugging sections are relative to the beginning
       of the section so we begin them at 0.  */
    /* DWARF 1 */
    .debug          0 : { *(.debug) }
    .line           0 : { *(.line) }
    /* GNU DWARF 1 extensions */
    .debug_srcinfo  0 : { *(.debug_srcinfo) }
    .debug_sfnames  0 : { *(.debug_sfnames) }
    /* DWARF 1.1 and DWARF 2 */
    .debug_aranges  0 : { *(.debug_aranges) }
    .debug_pubnames 0 : { *(.debug_pubnames) }
    /* DWARF 2 */
    .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
    .debug_abbrev   0 : { *(.debug_abbrev) }
    .debug_line     0 : { *(.debug_line) }
    .debug_frame    0 : { *(.debug_frame) }
    .debug_str      0 : { *(.debug_str) }
    .debug_loc      0 : { *(.debug_loc) }
    .debug_macinfo  0 : { *(.debug_macinfo) }
    /* SGI/MIPS DWARF 2 extensions */
    .debug_weaknames 0 : { *(.debug_weaknames) }
    .debug_funcnames 0 : { *(.debug_funcnames) }
    .debug_typenames 0 : { *(.debug_typenames) }
    .debug_varnames  0 : { *(.debug_varnames) }
}