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https://github.com/isfshax/isfshax.git
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84 lines
1.4 KiB
ArmAsm
84 lines
1.4 KiB
ArmAsm
/*
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* minute - a port of the "mini" IOS replacement for the Wii U.
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*
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* Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
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*
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* This code is licensed to you under the terms of the GNU GPL, version 2;
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* see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
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*/
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.arm
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.extern _main
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.extern __got_start
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.extern __got_end
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.extern __bss_start
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.extern __bss_end
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.extern __stack_addr
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.globl _start
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.extern v_irq
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.section .init
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_vectors:
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_start:
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ldr pc, =v_reset
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1: b 1b
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2: b 2b
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3: b 3b
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4: b 4b
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5: b 5b
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ldr pc, =v_irq
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6: b 6b
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.pool
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v_reset:
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@ Switch to System mode
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msr cpsr_c, #0xdf
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@ Get loader base from ELF loader
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mov r4, r0
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@ Set up a stack
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ldr sp, =__stack_addr
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@ clear the stack to a marker value
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ldr r1, =__stack_end
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ldr r2, =__stack_addr
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ldr r3, =0xDEADBEEF
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stk_loop:
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@ check for the end
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cmp r1, r2
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beq done_stk
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@ clear the word and move on
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str r3, [r1]
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add r1, r1, #4
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b stk_loop
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done_stk:
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@ clear BSS
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ldr r1, =__bss_start
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ldr r2, =__bss_end
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mov r3, #0
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bss_loop:
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@ check for the end
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cmp r1, r2
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beq done_bss
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@ clear the word and move on
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str r3, [r1]
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add r1, r1, #4
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b bss_loop
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done_bss:
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@ take the plunge
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mov r0, r4
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ldr r1, =_main
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blx r1
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@ _main returned! Go to whatever address it returned...
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bx r0
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.pool
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