148 lines
3.3 KiB
Plaintext
148 lines
3.3 KiB
Plaintext
STARTUP(crt0.o)
|
|
OUTPUT_ARCH(m68k)
|
|
/* Uncomment this if you want srecords. This is needed for a.out
|
|
* if you plan to use GDB.
|
|
OUTPUT_FORMAT(srec)
|
|
*/
|
|
|
|
SEARCH_DIR(.)
|
|
GROUP(-lidpgdb -lc -lgcc)
|
|
__DYNAMIC = 0;
|
|
|
|
/*
|
|
* Setup the memory map of the MC68ec0x0 Board (IDP)
|
|
* stack grows down from high memory. This works for
|
|
* both the rom68k and the mon68k monitors.
|
|
*
|
|
* The memory map look like this:
|
|
* +--------------------+ <- low memory
|
|
* | .text |
|
|
* | _etext |
|
|
* | ctor list | the ctor and dtor lists are for
|
|
* | dtor list | C++ support
|
|
* +--------------------+
|
|
* | .data | initialized data goes here
|
|
* | _edata |
|
|
* +--------------------+
|
|
* | .bss |
|
|
* | __bss_start | start of bss, cleared by crt0
|
|
* | _end | start of heap, used by sbrk()
|
|
* +--------------------+
|
|
* . .
|
|
* . .
|
|
* . .
|
|
* | __stack | top of stack
|
|
* +--------------------+
|
|
*/
|
|
|
|
/*
|
|
* When the IDP is not remapped (see rom68k's MP command in the
|
|
* "M68EC0x0IDP Users Manual", the first 64K bytes are reserved;
|
|
* Otherwise the first 256K bytes are reserved.
|
|
*
|
|
* The following memory map describes a unmapped IDP w/2MB RAM.
|
|
*/
|
|
|
|
MEMORY
|
|
{
|
|
ram (rwx) : ORIGIN = 0x00010000, LENGTH = 2M-64K
|
|
rom0 : ORIGIN = 0x00800000, LENGTH = 1M
|
|
rom1 : ORIGIN = 0x00900000, LENGTH = 1M
|
|
}
|
|
|
|
/*
|
|
* allocate the stack to be at the top of memory, since the stack
|
|
* grows down
|
|
*/
|
|
|
|
PROVIDE (__stack = 2M - 8);
|
|
|
|
/*
|
|
* Initalize some symbols to be zero so we can reference them in the
|
|
* crt0 without core dumping. These functions are all optional, but
|
|
* we do this so we can have our crt0 always use them if they exist.
|
|
* This is so BSPs work better when using the crt0 installed with gcc.
|
|
* We have to initalize them twice, so we cover a.out (which prepends
|
|
* an underscore) and coff object file formats.
|
|
*/
|
|
PROVIDE (hardware_init_hook = 0);
|
|
PROVIDE (_hardware_init_hook = 0);
|
|
PROVIDE (software_init_hook = 0);
|
|
PROVIDE (_software_init_hook = 0);
|
|
/*
|
|
* stick everything in ram (of course)
|
|
*/
|
|
SECTIONS
|
|
{
|
|
.text :
|
|
{
|
|
CREATE_OBJECT_SYMBOLS
|
|
*(.text .text.*)
|
|
|
|
. = ALIGN(0x4);
|
|
/* These are for running static constructors and destructors under ELF. */
|
|
KEEP (*crtbegin.o(.ctors))
|
|
KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
|
|
KEEP (*(SORT(.ctors.*)))
|
|
KEEP (*(.ctors))
|
|
KEEP (*crtbegin.o(.dtors))
|
|
KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
|
|
KEEP (*(SORT(.dtors.*)))
|
|
KEEP (*(.dtors))
|
|
|
|
*(.rodata .rodata.*)
|
|
|
|
. = ALIGN(0x4);
|
|
*(.gcc_except_table)
|
|
|
|
. = ALIGN(0x4);
|
|
*(.eh_frame)
|
|
|
|
. = ALIGN(0x4);
|
|
__INIT_SECTION__ = . ;
|
|
LONG (0x4e560000) /* linkw %fp,#0 */
|
|
*(.init)
|
|
SHORT (0x4e5e) /* unlk %fp */
|
|
SHORT (0x4e75) /* rts */
|
|
|
|
. = ALIGN(0x4);
|
|
__FINI_SECTION__ = . ;
|
|
LONG (0x4e560000) /* linkw %fp,#0 */
|
|
*(.fini)
|
|
SHORT (0x4e5e) /* unlk %fp */
|
|
SHORT (0x4e75) /* rts */
|
|
|
|
_etext = .;
|
|
*(.lit)
|
|
} > ram
|
|
|
|
.data :
|
|
{
|
|
*(.got.plt) *(.got)
|
|
*(.shdata)
|
|
*(.data .data.*)
|
|
_edata = .;
|
|
} > ram
|
|
|
|
.bss :
|
|
{
|
|
. = ALIGN(0x4);
|
|
__bss_start = . ;
|
|
*(.shbss)
|
|
*(.bss .bss.*)
|
|
*(COMMON)
|
|
_end = ALIGN (0x8);
|
|
__end = _end;
|
|
} > ram
|
|
|
|
.stab 0 (NOLOAD) :
|
|
{
|
|
*(.stab)
|
|
}
|
|
|
|
.stabstr 0 (NOLOAD) :
|
|
{
|
|
*(.stabstr)
|
|
}
|
|
}
|