LO reg. gets trashed by kgdb in 2.4.x and older kernels

[Sergei Shtylyov <sshtylyov@dev.rtsoft.ru>]

Hi.

    I have discovered that the gdb-low.S trashes the LO reg. instead of 
restoring it. This was fixed for the 2.6 kernels but, as it seems, was left 
unfixed in the earlier ones (run into this on 2.4.18/2.4.20). Here's the patch
against the lastest 2.4.x revision of the file...

Index: linux/arch/mips/kernel/gdb-low.S
===================================================================
RCS file: /home/cvs/linux/arch/mips/kernel/gdb-low.S,v
retrieving revision 1.11.2.3
diff -a -u -r1.11.2.3 gdb-low.S
--- linux/arch/mips/kernel/gdb-low.S    20 Feb 2003 18:19:01 -0000      1.11.2.3
+++ linux/arch/mips/kernel/gdb-low.S    5 Jul 2004 14:48:08 -0000
@@ -283,7 +283,7 @@
                lw      v0,GDB_FR_HI(sp)
                lw      v1,GDB_FR_LO(sp)
                mthi    v0
-               mtlo    v0
+               mtlo    v1
                lw      ra,GDB_FR_REG31(sp)
                lw      fp,GDB_FR_REG30(sp)
                lw      gp,GDB_FR_REG28(sp)