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From: cvs at opencores.org<cvs@o...>
Date: Wed Mar 28 07:37:34 CEST 2007
Subject: [cvs-checkins] MODIFIED: mlite ...
Date: 00/07/03 28:07:37

Modified: mlite/tools boot.asm
Log:
Use linker values _gp, __bss_start, _end, and InitStack


Revision Changes Path
1.12 mlite/tools/boot.asm

http://www.opencores.org/cvsweb.shtml/mlite/tools/boot.asm.diff?r1=1.11&r2=1.12

(In the diff below, changes in quantity of whitespace are not shown.)

Index: boot.asm
===================================================================
RCS file: /cvsroot/rhoads/mlite/tools/boot.asm,v
retrieving revision 1.11
retrieving revision 1.12
diff -u -b -r1.11 -r1.12
--- boot.asm 14 Feb 2007 19:00:06 -0000 1.11
+++ boot.asm 28 Mar 2007 05:37:33 -0000 1.12
@@ -16,16 +16,12 @@
entry:
.set noreorder

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

$BSS_CLEAR:
sw $0, 0($4)
@@ -51,6 +47,7 @@

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