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https://github.com/devkitPro/buildscripts.git
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57 lines
1.0 KiB
ArmAsm
57 lines
1.0 KiB
ArmAsm
@---------------------------------------------------------------------------------
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@ nintendo e-reader startup code
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@---------------------------------------------------------------------------------
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@ author : tim schuerewegen
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@ version : 1.0
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@---------------------------------------------------------------------------------
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.section ".crt0","ax"
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.global _start
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.align
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.arm
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@---------------------------------------------------------------------------------
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_start:
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@---------------------------------------------------------------------------------
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b start_vector
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.long 0
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.long 0x02000000
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start_vector:
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@ enter thumb mode
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adr r0, _start_thumb + 1
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bx r0
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.thumb
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_start_thumb:
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@ save return address (rom)
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mov r3, lr
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@ clear bss section
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ldr r0, =__bss_start
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ldr r1, =__bss_end
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mov r2, #0
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_loop_bss_clear:
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strb r2, [r0]
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add r0, #1
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cmp r0, r1
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blt _loop_bss_clear
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@ set return address (rom)
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mov lr, r3
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@ jump to main
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ldr r3, =main
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bx r3
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.align
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.pool
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.end
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.align
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.pool
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.end
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