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77 lines
1.6 KiB
ArmAsm
77 lines
1.6 KiB
ArmAsm
# Copyright 2008-2009 Segher Boessenkool <segher@kernel.crashing.org>
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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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.set r0,0; .set r1,1; .set r2,2; .set r3,3; .set r4,4;
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.set r5,5; .set r6,6; .set r7,7; .set r8,8; .set r9,9;
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.set r10,10; .set r11,11; .set r12,12; .set r13,13; .set r14,14;
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.set r15,15; .set r16,16; .set r17,17; .set r18,18; .set r19,19;
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.set r20,20; .set r21,21; .set r22,22; .set r23,23; .set r24,24;
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.set r25,25; .set r26,26; .set r27,27; .set r28,28; .set r29,29;
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.set r30,30; .set r31,31;
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.extern _main
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.globl _start
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_start:
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# Disable interrupts
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mfmsr r3
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rlwinm r3,r3,0,17,15
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mtmsr r3
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isync
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# Reset our registers
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bl __init_registers
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# Clear BSS.
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lis r3,__bss_start@h
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ori r3,r3,__bss_start@l
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li r4,0
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lis r5,__bss_end@h
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ori r5,r5,__bss_end@l
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subf r5,r3,r5
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bl _memset
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# Go!
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bl _main
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#thanks to megazig for that
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__init_registers:
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li r0,0
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li r3,0
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li r4,0
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li r5,0
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li r6,0
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li r7,0
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li r8,0
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li r9,0
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li r10,0
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li r11,0
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li r12,0
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li r14,0
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li r15,0
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li r16,0
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li r17,0
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li r18,0
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li r19,0
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li r20,0
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li r21,0
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li r22,0
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li r23,0
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li r24,0
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li r25,0
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li r26,0
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li r27,0
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li r28,0
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li r29,0
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li r30,0
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li r31,0
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lis r1,__stack_top@h
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ori r1,r1,__stack_top@l
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addi r1,r1,-4
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stw r0,0(r1)
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stwu r1,-0x38(r1)
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lis r2,0
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ori r2,r2,0x8000
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lis r13,0
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ori r13,r13,0x8000
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blr
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