mirror of
https://github.com/ApacheThunder/ntr-hb-menu.git
synced 2025-06-19 03:35:32 -04:00
fcec9c72d0
* Added background graphics for bottom screen console * Used new font for bottom screen. A stripped down version of the misaki-gothic used by GodMode9i -> https://github.com/DS-Homebrew/GodMode9i/tree/master/resources/fonts * Renamed folders for bootloader and exception stub as I am not setup to deal with sub-modules at the moment.
110 lines
3.5 KiB
ArmAsm
110 lines
3.5 KiB
ArmAsm
/*---------------------------------------------------------------------------------
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Copyright (C) 2005 - 2017
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Dave Murphy (WinterMute)
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any
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damages arising from the use of this software.
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Permission is granted to anyone to use this software for any
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purpose, including commercial applications, and to alter it and
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redistribute it freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you
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must not claim that you wrote the original software. If you use
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this software in a product, an acknowledgment in the product
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documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and
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must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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---------------------------------------------------------------------------------*/
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@---------------------------------------------------------------------------------
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@ DS processor selection
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@---------------------------------------------------------------------------------
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.arch armv5te
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.cpu arm946e-s
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@---------------------------------------------------------------------------------
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@---------------------------------------------------------------------------------
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.section ".crt0","ax"
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.global _start
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@---------------------------------------------------------------------------------
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.align 4
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.arm
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@---------------------------------------------------------------------------------
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_start:
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@---------------------------------------------------------------------------------
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push {lr}
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ldr r0, =__bss_start__ @ Clear BSS section
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ldr r1, =__bss_end__
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sub r1, r1, r0
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bl ClearMem
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ldr r0, =installException
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blx r0
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pop {lr}
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bx lr
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.pool
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@---------------------------------------------------------------------------------
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@ Clear memory to 0x00 if length != 0
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@ r0 = Start Address
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@ r1 = Length
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@---------------------------------------------------------------------------------
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ClearMem:
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@---------------------------------------------------------------------------------
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mov r2, #3 @ Round down to nearest word boundary
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add r1, r1, r2 @ Shouldn't be needed
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bics r1, r1, r2 @ Clear 2 LSB (and set Z)
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bxeq lr @ Quit if copy size is 0
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mov r2, #0
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ClrLoop:
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stmia r0!, {r2}
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subs r1, r1, #4
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bne ClrLoop
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bx lr
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@---------------------------------------------------------------------------------
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@ Copy memory if length != 0
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@ r1 = Source Address
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@ r2 = Dest Address
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@ r4 = Dest Address + Length
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@---------------------------------------------------------------------------------
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CopyMemCheck:
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@---------------------------------------------------------------------------------
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sub r3, r4, r2 @ Is there any data to copy?
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@---------------------------------------------------------------------------------
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@ Copy memory
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@ r1 = Source Address
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@ r2 = Dest Address
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@ r3 = Length
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@---------------------------------------------------------------------------------
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CopyMem:
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@---------------------------------------------------------------------------------
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mov r0, #3 @ These commands are used in cases where
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add r3, r3, r0 @ the length is not a multiple of 4,
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bics r3, r3, r0 @ even though it should be.
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bxeq lr @ Length is zero, so exit
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CIDLoop:
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ldmia r1!, {r0}
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stmia r2!, {r0}
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subs r3, r3, #4
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bne CIDLoop
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bx lr
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.align 2
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