URL https://opencores.org/ocsvn/eco32/eco32/trunk

Subversion Repositories eco32

[/] [eco32/] [trunk/] [monitor/] [monitor/] [copy/] [copy.s] - Diff between revs 62 and 200

Rev 62	Rev 200
`;`	`;`
`; copy.s -- copy a program from ROM to RAM before executing it`	`; copy.s -- copy a program from ROM to RAM before executing it`
`;`	`;`

`.set dst,0xC0000000 ; destination is start of RAM`	`.set dst,0xC0000000 ; destination is start of RAM`
`.set len,0x0000C000 ; number of bytes to be copied`	`.set len,0x0000FF00 ; number of bytes to be copied`

`.set PSW,0 ; reg # of PSW`	`.set PSW,0 ; reg # of PSW`

`reset:`	`reset:`
`j start`	`j start`

`interrupt:`	`interrupt:`
`j interrupt ; we better have no interrupts`	`j interrupt ; we better have no interrupts`

`userMiss:`	`userMiss:`
`j userMiss ; and no user TLB misses`	`j userMiss ; and no user TLB misses`

`start:`	`start:`
`mvts $0,PSW ; disable interrupts and user mode`	`mvts $0,PSW ; disable interrupts and user mode`
`add $8,$0,src`	`add $8,$0,src`
`add $9,$0,dst`	`add $9,$0,dst`
`add $10,$9,len`	`add $10,$9,len`
`loop:`	`loop:`
`ldw $11,$8,0 ; copy word`	`ldw $11,$8,0 ; copy word`
`stw $11,$9,0`	`stw $11,$9,0`
`add $8,$8,4 ; bump pointers`	`add $8,$8,4 ; bump pointers`
`add $9,$9,4`	`add $9,$9,4`
`bltu $9,$10,loop ; more?`	`bltu $9,$10,loop ; more?`
`add $8,$0,dst ; start execution`	`add $8,$0,dst ; start execution`
`jr $8`	`jr $8`

`; the program to be copied follows immediately`	`; the program to be copied follows immediately`
`src:`	`src:`