Alan Tyson (on Tue, 31 Oct 2006 18:45:54 +0000) wrote: >Hi Keith, > >When running SLES9 SP3, which has KDB compiled in, it is not possible to >enter into KDB or LKCD when a TC (transfer control) command is issued. >TC results in the OS init handler running and calling kdba_mca_init() >which gives the following error: > > kdba_mca_init: not enough data in pal_min_state_area for kdb backtrace, cpu 3 > >This error results in the following some time later on: > kdba_release_init_slave_stack: INIT slave tripped on cpu 0 when not in > kdb,should never happen > >The reason for the initial error is that kdba_mca_init() expects that >the floating point registers were saved by SAL when in fact they were >not. The SAL spec states that it is not necessary to store them and, >in the interests of NMRAM real estate, the HP rx7620 and rx8620 systems >do not. > >What would be the down-side of ignoring the valid.fr bit? I notice that >cr and minstate bits seem to have been ignored in previous changes. If the salinfo record does not contain the floating point registers then the corresponding fields in struct pt_regs that is built by KDB will be populated with garbage. It should not affect backtrace, gcc never stores addresses in the floating point registers. - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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