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https://opencores.org/ocsvn/eco32/eco32/trunk
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| Rev 18 |
Rev 95 |
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; start.s -- startup code
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; start.s -- startup code
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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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.code
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.code
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_bcode:
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_bcode:
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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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.code
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.code
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; reset arrives here
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reset:
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j start
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; interrupts arrive here
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intrpt:
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j intrpt
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; user TLB misses arrive here
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userMiss:
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j userMiss
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start:
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start:
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mvfs $8,0
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mvfs $8,0
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or $8,$8,1 << 27 ; let vector point to RAM
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or $8,$8,1 << 27 ; let vector point to RAM
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mvts $8,0
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mvts $8,0
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add $29,$0,stack ; set sp
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add $29,$0,stack ; set sp
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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
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add $8,$0,_bbss ; clear bss
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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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jal main ; call 'main'
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jal main ; call 'main'
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start1:
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start1:
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j start1 ; loop
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j start1 ; loop
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.bss
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.bss
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.align 4
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.align 4
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.space 0x800
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.space 0x800
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stack:
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stack:
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