OpenCores

Rev 39	Rev 56
Line 9...	Line 9...

`; R14 always contains memory base address (0)`	`; R14 always contains memory base address (0)`

`ldi r14,0`	`ldi r14,0`

`; Set the USER stack pointer.`	`; Set the USER and SYSTEM stack pointers.`

`ldi sp, 0x8000 ; SW`
`mvtc sp, psw ; psw <- SW`
`ldi sp, _stack`
`ldi r0,0 ; zero arguments`	`ldi r0,0 ; zero arguments`
`ldi r1,0`	`ldi r1,0`
	`mvtc r0, psw ; select SPI and set it`
	`ldi sp, _stack`
	`ldi r10, 0x8000 ; select SPU/FP and set it`
	`mvtc r10, psw \|\| ldi r11, 0; clear stack frame`
	`ldi sp, _stack - 0x200`
	`ldi r13, 0`

`; Clear the BSS. Do it in two parts for efficiency: longwords first`	`; Clear the BSS. Do it in two parts for efficiency: longwords first`
`; for most of it, then the remaining 0 to 3 bytes.`	`; for most of it, then the remaining 0 to 3 bytes.`

`ldi r2, __bss_start ; R2 = start of BSS`	`ldi r2, __bss_start ; R2 = start of BSS`
Line 42...	Line 45...
`stb r0, @r2 ; yep, zero out another byte`	`stb r0, @r2 ; yep, zero out another byte`
`addi r2, 1 ; bump address`	`addi r2, 1 ; bump address`
`subi r4, 1 ; decrement count`	`subi r4, 1 ; decrement count`
`bra.s loop2 ; go do some more`	`bra.s loop2 ; go do some more`
`endloop2:`	`endloop2:`

`; Call main, then stop simulator`	`; Call main, then stop simulator`
	`st r11, @-sp`
	`st r13, @-sp`
	`mv r11, sp`

`bl main`	`bl main`
`bl exit`	`bl exit`
`stop`	`stop`
`.Lstart:`	`.Lstart:`

Line 9...

; R14 always contains memory base address (0)

; R14 always contains memory base address (0)

        ldi     r14,0

        ldi     r14,0

; Set the USER stack pointer.

; Set the USER and SYSTEM stack pointers.

        ldi     sp, 0x8000      ; SW

        mvtc    sp, psw         ; psw <- SW

        ldi     sp, _stack

        ldi     r0,0            ; zero arguments

        ldi     r0,0            ; zero arguments

        ldi     r1,0

        ldi     r1,0

        mvtc    r0, psw         ; select SPI and set it

        ldi     sp, _stack

        ldi     r10, 0x8000     ; select SPU/FP and set it

        mvtc r10, psw || ldi r11, 0;  clear stack frame

        ldi     sp, _stack - 0x200

        ldi     r13, 0

; Clear the BSS.  Do it in two parts for efficiency: longwords first

; Clear the BSS.  Do it in two parts for efficiency: longwords first

; for most of it, then the remaining 0 to 3 bytes.

; for most of it, then the remaining 0 to 3 bytes.

        ldi     r2, __bss_start ; R2 = start of BSS

        ldi     r2, __bss_start ; R2 = start of BSS

Line 42...

Line 45...

        stb     r0, @r2         ; yep, zero out another byte

        stb     r0, @r2         ; yep, zero out another byte

        addi    r2, 1           ; bump address

        addi    r2, 1           ; bump address

        subi    r4, 1           ; decrement count

        subi    r4, 1           ; decrement count

        bra.s   loop2           ; go do some more

        bra.s   loop2           ; go do some more

endloop2:

endloop2:

; Call main, then stop simulator

; Call main, then stop simulator

        st r11, @-sp

        st r13, @-sp

        mv r11, sp

        bl      main

        bl      main

        bl      exit

        bl      exit

        stop

        stop

.Lstart:

.Lstart:

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