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violette 2025-08-21 22:24:02 -04:00
parent d8f573c678
commit 7f69f474f6
4 changed files with 636 additions and 57 deletions
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/*
* SPDX-License-Identifier: CC0-1.0
*
* SPDX-FileContributor: Antonio Niño Díaz, 2022
*/
/*
* Some links with information about linker scripts:
*
* - https://refspecs.linuxbase.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/specialsections.html
*
* - https://blog.thea.codes/the-most-thoroughly-commented-linker-script/
*
* - http://beefchunk.com/documentation/sys-programming/binary_formats/elf/elf_from_the_programmers_perspective/node4.html
*/
OUTPUT_FORMAT("elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(entrypoint)
MEMORY {
ROM : ORIGIN = 0x08000000, LENGTH = 32M
IWRAM : ORIGIN = 0x03000000, LENGTH = 32K
EWRAM : ORIGIN = 0x02000000, LENGTH = 256K
}
/* Set stack pointers the same way as the BIOS */
__STACK_SVC_SIZE__ = 0x40;
__STACK_IRQ_SIZE__ = 0xA0;
__STACK_USR_SIZE_MIN__ = 0x200; /* Minimum size, the real size may be bigger */
__STACK_END__ = ORIGIN(IWRAM) + LENGTH(IWRAM) - 0x20; /* Used by BIOS */
__STACK_SVC_END__ = __STACK_END__;
__STACK_SVC_START__ = __STACK_SVC_END__ - __STACK_SVC_SIZE__;
__STACK_IRQ_END__ = __STACK_SVC_START__;
__STACK_IRQ_START__ = __STACK_IRQ_END__ - __STACK_IRQ_SIZE__;
__STACK_USR_END__ = __STACK_IRQ_START__;
__STACK_USR_START__ = __STACK_USR_END__ - __STACK_USR_SIZE_MIN__;
__STACK_START__ = __STACK_USR_START__;
SECTIONS
{
/*
* ROM sections
* ============
*/
/* Header and crt0 */
.gba_crt0 : ALIGN(4)
{
KEEP (*(.gba_crt0))
} > ROM
/* Code */
.text : ALIGN(4)
{
*(.text)
*(.text*)
*(.gnu.linkonce.t.*) /* Used for vague linking */
/* ARM/Thumb interworking code */
*(.glue_7) /* glue arm to thumb code */
*(.glue_7t) /* glue thumb to arm code */
/* Array of functions to be called at the start of the program */
KEEP(*(.init))
/* Array of functions to be called at the end of the program */
KEEP(*(.fini))
} > ROM
/* Read-only data */
.rodata : ALIGN(4)
{
*(.rodata)
*(.rodata*)
*(.gnu.linkonce.r.*) /* Used for vague linking */
} > ROM
/*
* Required for C++ and for C programs that try to examine backtraces. Each
* function that can throw exceptions has entries in exidx and extab.
*
* - exidx is used to contain index entries for stack unwinding.
* - extab names sections containing exception unwinding information.
*/
.ARM.extab : ALIGN(4)
{
*(.ARM.extab* .gnu.linkonce.armextab.*)
} > ROM
.ARM.exidx : ALIGN(4)
{
PROVIDE_HIDDEN(__exidx_start = .);
*(.ARM.exidx* .gnu.linkonce.armexidx.*)
PROVIDE_HIDDEN(__exidx_end = .);
} > ROM
/* Array of functions to be called during initialization of the program */
.preinit_array : ALIGN(4)
{
__preinit_array_start = .;
KEEP(*(.preinit_array*))
__preinit_array_end = .;
} > ROM
/*
* Array of functions to be called during initialization of the program.
* They are called after calling everything in .preinit_array
*/
.init_array : ALIGN(4)
{
__init_array_start = .;
KEEP(*(SORT(.init_array.*)))
KEEP(*(.init_array*))
__init_array_end = .;
} > ROM
/* Array of functions called when the program ends. */
.fini_array : ALIGN(4)
{
__fini_array_start = .;
KEEP(*(SORT(.fini_array.*)))
KEEP(*(.fini_array*))
__fini_array_end = .;
} > ROM
/*
* IWRAM sections
* ==============
*/
/* Uninitialized variables */
.bss (NOLOAD) : ALIGN(4)
{
*(.bss)
*(.bss*)
*(.gnu.linkonce.b.*) /* Used for vague linking */
*(COMMON) /* In case -fcommon is used in gcc (not used by default) */
. = ALIGN(4);
} > IWRAM
__IWRAM_BSS_START__ = ADDR(.bss);
__IWRAM_BSS_SIZE__ = SIZEOF(.bss);
__IWRAM_BSS_END__ = __IWRAM_BSS_START__ + __IWRAM_BSS_SIZE__;
/* Read-write data goes into IWRAM */
.data : ALIGN(4)
{
__DATA_START__ = .;
*(.data)
*(.data*)
*(.gnu.linkonce.d.*) /* Used for vague linking */
. = ALIGN(4);
__DATA_END__ = .;
} > IWRAM AT> ROM
__DATA_SIZE__ = __DATA_END__ - __DATA_START__;
__DATA_LMA__ = LOADADDR(.data);
/* Sections that the user requests to add to IWRAM */
.iwram : ALIGN(4)
{
__IWRAM_START__ = .;
*(.iwram)
*(.iwram*)
*iwram.*(.text*)
*iwram.*(.data*)
. = ALIGN(4);
__IWRAM_END__ = .;
} > IWRAM AT> ROM
__IWRAM_SIZE__ = __IWRAM_END__ - __IWRAM_START__;
__IWRAM_LMA__ = LOADADDR(.iwram);
/* The stack goes afterwards, check that there aren't overflows */
ASSERT(__IWRAM_END__ <= __STACK_START__,
"Not enough free IWRAM for stack")
/* Calculate real size of the user stack */
__STACK_USR_SIZE__ = __STACK_USR_END__ - __IWRAM_END__;
/*
* EWRAM sections
* ==============
*/
/*
* Uninitialized data explicitly placed in EWRAM. This section must be
* called ".sbss" for compatibility with devkitARM.
*/
.sbss (NOLOAD) : ALIGN(4)
{
*(.sbss)
*(.sbss*)
. = ALIGN(4);
} > EWRAM
/* Initialized data explicitly placed in EWRAM */
.ewram : ALIGN(4)
{
__EWRAM_START__ = .;
*(.ewram)
*(.ewram*)
*ewram.*(.text*)
*ewram.*(.data*)
. = ALIGN(4);
__EWRAM_END__ = .;
} > EWRAM AT > ROM
__EWRAM_SIZE__ = __EWRAM_END__ - __EWRAM_START__;
__EWRAM_LMA__ = LOADADDR(.ewram);
/* The heap information should be after the last EWRAM section */
__HEAP_START__ = __EWRAM_END__;
__HEAP_END__ = ORIGIN(EWRAM) + LENGTH(EWRAM);
__HEAP_SIZE__ = __HEAP_END__ - __HEAP_START__;
}