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)
