URL
https://opencores.org/ocsvn/eco32/eco32/trunk
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| Rev 18 |
Rev 106 |
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; c0.s -- startup code and begin-of-segment labels
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; c0.s -- startup code and begin-of-segment labels
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.import main
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.import main
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.import _ecode
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.import _ecode
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.import _edata
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.import _edata
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.import _ebss
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.import _ebss
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.export _bcode
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.export _bcode
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.export _bdata
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.export _bdata
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.export _bbss
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.export _bbss
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.import bootDisk
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.import bootDisk
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.import startSector
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.import startSector
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.import numSectors
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.import numSectors
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.import entryPoint
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.code
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.code
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_bcode:
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_bcode:
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start:
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start:
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add $10,$0,_bdata ; copy data segment
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add $10,$0,_bdata ; copy data segment
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add $8,$0,_edata
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add $8,$0,_edata
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sub $9,$8,$10
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sub $9,$8,$10
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add $9,$9,_ecode
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add $9,$9,_ecode
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j cpytest
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j cpytest
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cpyloop:
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cpyloop:
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ldw $11,$9,0
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ldw $11,$9,0
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stw $11,$8,0
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stw $11,$8,0
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cpytest:
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cpytest:
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sub $8,$8,4
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sub $8,$8,4
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sub $9,$9,4
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sub $9,$9,4
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bgeu $8,$10,cpyloop
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bgeu $8,$10,cpyloop
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add $8,$0,_bbss ; clear bss segment
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add $8,$0,_bbss ; clear bss segment
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add $9,$0,_ebss
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add $9,$0,_ebss
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j clrtest
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j clrtest
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clrloop:
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clrloop:
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stw $0,$8,0
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stw $0,$8,0
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add $8,$8,4
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add $8,$8,4
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clrtest:
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clrtest:
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bltu $8,$9,clrloop
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bltu $8,$9,clrloop
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add $29,$0,0xC0100000 ; setup stack
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add $29,$0,0xC0020000 ; setup stack
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stw $16,$0,bootDisk ; make arguments available
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stw $16,$0,bootDisk ; make arguments available
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stw $17,$0,startSector
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stw $17,$0,startSector
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stw $18,$0,numSectors
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stw $18,$0,numSectors
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jal main ; call 'main' function
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jal main ; call 'main' function
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ldw $16,$0,bootDisk ; setup arguments for next stage
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ldw $16,$0,bootDisk ; setup arguments for next stage
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ldw $17,$0,startSector
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ldw $17,$0,startSector
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ldw $18,$0,numSectors
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ldw $18,$0,numSectors
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add $31,$0,0xC0000000 ; jump to loaded program
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ldw $31,$0,entryPoint ; jump to loaded program
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jr $31
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jr $31
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.data
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.data
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_bdata:
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_bdata:
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.bss
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.bss
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_bbss:
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_bbss:
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