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[IA64] ar.fpsr not set on MCA/INIT kernel entry 

When entering the kernel due to an MCA or INIT, ar.fpsr (ar40)
was not getting set to the kernel default value (remaining
at the user value).  The effect depends on the user setting 
of ar.fpsr.  In the test case, the effect was addresses 
printing with strange hex values.  

Setting ar.fpsr in ia64_set_kernel_registers sets it for both
the MCA and INIT paths.  The user value of ar.fpsr is correctly 
saved (in ia64_state_save) and restored (in ia64_state_restore).

Below is an example of output with very strange hex values.
Anyone know the value of hex 'g'?  :-)

Processes interrupted by INIT - 0 (cpu 14 task 0xdfffg55g7a4c6gA)

Signed-off-by: Russ Anderson (rja@sgi.com)
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Russ Anderson 2006-09-18 18:37:15 -05:00 committed by Tony Luck
parent 43ed3baf62
commit 8f9e146732
1 changed files with 4 additions and 0 deletions
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4
arch/ia64/kernel/mca_asm.S
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@ -1062,6 +1062,10 @@ ia64_set_kernel_registers:
mov cr.itir=r18 mov cr.itir=r18
mov cr.ifa=r13 mov cr.ifa=r13
mov r20=IA64_TR_CURRENT_STACK mov r20=IA64_TR_CURRENT_STACK
movl r17=FPSR_DEFAULT
;;
mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
;; ;;
itr.d dtr[r20]=r21 itr.d dtr[r20]=r21
;; ;;