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

Subversion Repositories mlite

[/] [mlite/] [trunk/] [tools/] [boot.asm] - Diff between revs 194 and 200

Rev 194	Rev 200
Line 14...	Line 14...
`.globl entry`	`.globl entry`
`.ent entry`	`.ent entry`
`entry:`	`entry:`
`.set noreorder`	`.set noreorder`

`#These eight instructions must be the first instructions.`	`#These eight instructions should be the first instructions.`
`#convert.exe will correctly initialize $gp, .sbss_start, .bss_end, $sp`	`#convert.exe previously initialized $gp, .sbss_start, .bss_end, $sp`
`lui $gp, 0`	`la $gp, _gp #initialize stack pointer`
`ori $gp, $gp, 0 #initialize $gp`	`la $4, __bss_start #$4 = .sbss_start`
`lui $4, 0`	`la $5, _end #$5 = .bss_end`
`ori $4, $4, 0 #$4 = .sbss_start`	`la $sp, InitStack+488 #initialize stack pointer`
`lui $5, 0`
`ori $5, $5, 0 #$5 = .bss_end`
`lui $sp, 0`
`ori $sp, $sp, 0xfff0 #initialize stack pointer`

`$BSS_CLEAR:`	`$BSS_CLEAR:`
`sw $0, 0($4)`	`sw $0, 0($4)`
`slt $3, $4, $5`	`slt $3, $4, $5`
`bnez $3, $BSS_CLEAR`	`bnez $3, $BSS_CLEAR`
Line 49...	Line 45...
`.set noreorder`	`.set noreorder`
`.set noat`	`.set noat`

`#Registers $26 and $27 are reserved for the OS`	`#Registers $26 and $27 are reserved for the OS`
`#Save all temporary registers`	`#Save all temporary registers`
	`#Slots 0($29) through 12($29) reserved for saving a0-a3`
`addi $29, $29, -104 #adjust sp`	`addi $29, $29, -104 #adjust sp`
`sw $1, 16($29) #at`	`sw $1, 16($29) #at`
`sw $2, 20($29) #v0`	`sw $2, 20($29) #v0`
`sw $3, 24($29) #v1`	`sw $3, 24($29) #v1`
`sw $4, 28($29) #a0`	`sw $4, 28($29) #a0`