gint/fx9860g.ld

/*
	Linker script for the fx9860g platform. Most of the symbols defined
	here are used in the initialization routine in core/start.c; others are
	used in core/setup.c.
*/

/* fx9860g may mean SH3 or SH4 and we want full compatibility */
OUTPUT_ARCH(sh3)
/* ELF offers a lot of symbol/section/relocation insights */
OUTPUT_FORMAT(elf32-sh)
/* Located in core/start.c */
ENTRY(_start)

MEMORY
{
	/* Userspace mapping of the add-in (0x200 B are for the G1A header).
	   220k is the maximum amount of simultaneously-mappable code */
	rom  (rx):	o = 0x00300200, l = 220k
	/* This is mapped to RAM; 8k on SH3, apparently 32k on SH4 */
	ram  (rw):	o = 0x08100000, l = 8k
	/* gint's VBR space, mentioned here for completeness */
	vbr  (rwx):	o = 0x8800e000, l = 4k
	/* Some RAM region from P1 area; gint's data will reside here */
	rram (rwx):	o = 0x8800f000, l = 4k
}

SECTIONS
{
	/*
	**	ROM sections
	*/

	/* First address to be mapped to ROM (including G1A header) */
	_brom = 0x00300000;
	/* Size of ROM mappings */
	_srom = 0x200
	      + SIZEOF(.text) + SIZEOF(.rodata)
	      + SIZEOF(.gint.drivers) + SIZEOF(.gint.blocks);

	/* Machine code going to ROM:
	   - Initialization sections (.pretext.entry and .pretext)
	   - Compiler-provided constructors (.ctors) and destructors (.dtors)
	   - All text from .text and .text.* (including user code)
	   - Code sections from fxlib, named "C" and "P" */

	.pretext : {
		*(.pretext.entry)
		*(.pretext)

		_btors = . ;
		*(.ctors .ctors.*)
		_mtors = . ;
		*(.dtors .dtors.*)
		_etors = . ;
	} > rom

	.text : {
		*(.text .text.*)
		*(C P)
	} > rom

	/* Interrupt handlers going to ROM:
	   - gint's interrupt handler blocks (.gint.blocks)

	   Although gint's blocks end up in VBR space, they are selected and
	   installed on-the-fly by the library and the drivers, so we can't
	   just put them in the vbr region and wait for the copy */
	.gint.blocks : {
		KEEP(*(.gint.blocks));
	} > rom

	/* Driver data going to ROM:
	   - Exposed driver interfaces (.gint.drivers)

	   The driver information is required to start and configure the
	   driver, even if the symbols are not referenced */
	.gint.drivers : {
		_bdrv = . ;
		KEEP(*(.gint.drivers));
		_edrv = . ;
	} > rom

	/* Read-only data going to ROM:
	   - Resources or assets from fxconv or similar converters
	   - Data marked read-only by the compiler (.rodata and .rodata.*) */
	.rodata : SUBALIGN(4) {
		*(.rodata .rodata.*)
	} > rom



	/*
	**	RAM sections
	*/

	. = ORIGIN(ram);

	/* BSS stuff going to RAM:
	   - Data marked BSS by the compiler
	   - BSS sections from fxlib, namely "B" and "R"
	   The BSS section is to be stripped from the ELF file later, and wiped
	   at startup. */
	.bss (NOLOAD) : {
		_rbss = . ;

		*(.bss COMMON)
		*(B R)

		. = ALIGN(16);
	} > ram :NONE

	_sbss = SIZEOF(.bss);

	/* Read-write data going to RAM:
	   - Data sections generated by the compiler (.data and .data.*)
	   - Data sections from fxlib, "D" */
	.data ALIGN(4) : ALIGN(4) {
		_ldata = LOADADDR(.data);
		_rdata = . ;

		*(.data .data.*)
		*(D)

		. = ALIGN(16);
	} > ram AT> rom

	_sdata = SIZEOF(.data);



	/*
	**	RRAM sections
	**	8800e000:4k  VBR space
	**	8800f000:4k  .gint.data and .gint.bss
	*/

	/* VBR address: let's just start at the beginning of the RRAM area.
	   There's an unused 0x100-byte gap at the start of the VBR space.
	   The VBR space is already a large block (> 2 kiB), so I'm cutting off
	   the gap to spare some memory */
	_gint_vbr = 0x8800df00;

	. = ORIGIN(rram);

	/* gint's data section, going to Real RAM. This section contains many
	   small objects from the library (static/global variables, etc) */
	.gint.data ALIGN(4) : ALIGN(4) {
		_lgdata = LOADADDR(.gint.data);
		_rgdata = . ;

		*(.gint.data .gint.data.*)

		. = ALIGN(16);
	} > rram AT> rom

	_sgdata = SIZEOF(.gint.data);

	/* gint's uninitialized BSS section, going to Real RAM. All the large
	   data arrays will be located here */
	.gint.bss (NOLOAD) : {
		/* Since it's uninitialized, the location doesn't matter */
		*(.gint.bss .gint.bss.*)

		. = ALIGN(16);
	} > rram :NONE

	_sgbss = SIZEOF(.gint.bss);



	/*
	**	Other sections
	*/

	/* Unwanted sections going to meet Dave Null:
	   - Java classes registration (why are there even here?)
	   - Asynchronous unwind tables: no C++ exception handling for now ^^
	   - Comments or anything the compiler might put in its assembler
	   - A stack section sometimes generated for build/version.o */
	/DISCARD/ : {
		*(.jcr)
		*(.eh_frame_hdr)
		*(.eh_frame)
		*(.comment)
	}
}