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Add multiboot support
This commit is contained in:
Gwilym Kuiper
parent
0cafd8eaca
commit
d2cad77eb9
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@ -2,6 +2,7 @@ use agb_image_converter::{convert_image, Colour, ImageConverterConfig, TileSize}
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fn main() {
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println!("cargo:rerun-if-changed=crt0.s");
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println!("cargo:rerun-if-changed=gba_mb.ld");
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println!("cargo:rerun-if-changed=interrupt_simple.s");
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println!("cargo:rerun-if-changed=gfx/test_logo.png");
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46
agb/crt0.s
46
agb/crt0.s
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@ -6,6 +6,48 @@ __start:
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@ Filled in by gbafix
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.fill 188, 1, 0
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@ multiboot launch point
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b .Initialise_mb
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.byte 0 @ boot mode, BIOS overwrites this value
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.byte 0 @ slave ID number
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.fill 26, 1, 0 @ unused?
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.word 0 @ joybus entrypoint
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.Initialise_mb:
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swi 0x00250000
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@ Set interrupt handler
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ldr r0, =InterruptHandlerSimple
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ldr r1, =0x03007FFC
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str r0, [r1]
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@ copies iwram section in ewram to iwram
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ldr r0, =__iwram_rom_start @ load memory address storing start of data for iwram in rom
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ldr r1, =__iwram_data_start @ load memory address storing location of iwram in ram
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ldr r2, =__iwram_rom_length_halfwords @ load number of 16 bit values to copy
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swi 0x000B0000 @ call interrupt CpuSet.
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@ r0: source
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@ r1: destination
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@ r2: length + size information
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@
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@ see: https://mgba-emu.github.io/gbatek/#swi-0bh-gbands7nds9dsi7dsi9---cpuset
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@ everything is in ewram so it is already there, no need to copy that bit
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@ put zero in both r0 and r1
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@ This corresponds to zero for argc and argv (which would technically be required for a c runtime)
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ldr r0, =0
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mov r1, r0
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@ load main and branch
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ldr r2, =main
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bx r2
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@ loop if we end up here
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1:
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b 1b
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.Initialise:
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@ Set interrupt handler
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ldr r0, =InterruptHandlerSimple
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@ -39,6 +81,10 @@ __start:
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@ load main and branch
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ldr r2, =main
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bx r2
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@ loop if we end up here
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1:
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b 1b
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.pool
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.include "interrupt_simple.s"
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107
agb/gba_mb.ld
Normal file
107
agb/gba_mb.ld
Normal file
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@ -0,0 +1,107 @@
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OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
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OUTPUT_ARCH(arm)
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ENTRY(__start)
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MEMORY {
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ewram (w!x) : ORIGIN = 0x02000000, LENGTH = 256K
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iwram (w!x) : ORIGIN = 0x03000000, LENGTH = 32K
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}
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__text_start = ORIGIN(ewram);
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SECTIONS {
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. = __text_start;
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.crt0 : {
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KEEP (crt0.o(.text));
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. = ALIGN(4);
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} > ewram
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.text : {
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*(.text .text*);
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. = ALIGN(4);
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} > ewram
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__text_end = .;
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.rodata : {
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*(.rodata .rodata.*);
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. = ALIGN(4);
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} > ewram
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__iwram_rom_start = .;
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.iwram : {
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__iwram_data_start = ABSOLUTE(.);
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*(.iwram .iwram.*);
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. = ALIGN(4);
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*(.text_iwram .text_iwram.*);
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. = ALIGN(4);
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__iwram_data_end = ABSOLUTE(.);
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} > iwram AT>ewram
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. = __iwram_rom_start + (__iwram_data_end - __iwram_data_start);
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__ewram_rom_start = .;
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.ewram : {
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__ewram_data_start = ABSOLUTE(.);
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*(.ewram .ewram.*);
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. = ALIGN(4);
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*(.data .data.*);
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. = ALIGN(4);
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__ewram_data_end = ABSOLUTE(.);
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} > ewram AT>ewram
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.bss : {
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*(.bss .bss.*);
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. = ALIGN(4);
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} > iwram
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__iwram_rom_length_bytes = __iwram_data_end - __iwram_data_start;
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__iwram_rom_length_halfwords = (__iwram_rom_length_bytes + 1) / 2;
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__ewram_rom_length_bytes = __ewram_data_end - __ewram_data_start;
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__ewram_rom_length_halfwords = (__ewram_rom_length_bytes + 1) / 2;
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/* debugging sections */
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/* Stabs */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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/* DWARF 1 */
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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/* GNU DWARF 1 extensions */
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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/* DWARF 1.1 and DWARF 2 */
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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/* DWARF 2 */
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.debug_info 0 : { *(.debug_info) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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/* SGI/MIPS DWARF 2 extensions */
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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.debug_ranges 0 : { *(.debug_ranges) }
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/* discard anything not already mentioned */
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/DISCARD/ : { *(*) }
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}
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