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Line 641... Line 641...
641
 * TL2: preemptible trap handler did SAVE
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 * TL2: preemptible trap handler did SAVE
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 * TL3: spill handler touched the kernel stack  
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 * TL3: spill handler touched the kernel stack  
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 * TL4: hardware or software failure
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 * TL4: hardware or software failure
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 *
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 *
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 * Input registers:
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 * Input registers:
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 *	%g1		Address of function to call.
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 *	%g1		Address of function to call if this is not a syscall.
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 * 	%g2	 	First argument for the function.
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 * 	%g2	 	First argument for the function.
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 *	%g6		Pre-set as kernel stack base if trap from userspace.
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 *	%g6		Pre-set as kernel stack base if trap from userspace.
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 *	%g7		Pre-set as address of the userspace window buffer.
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 *	%g7		Pre-set as address of the userspace window buffer.
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 */
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 */
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.macro PREEMPTIBLE_HANDLER_TEMPLATE is_syscall
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.macro PREEMPTIBLE_HANDLER_TEMPLATE is_syscall
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695
 
695
 
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.if \is_syscall
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.if \is_syscall
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	/*
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	/*
698
	 * Copy arguments for the syscall to the new window.
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	 * Copy arguments for the syscall to the new window.
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	 */
699
	 */
-
 
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	mov %i0, %o0
-
 
701
	mov %i1, %o1
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	mov %i0, %o2
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	mov %i2, %o2
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	mov %i1, %o3
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	mov %i3, %o3
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	mov %i2, %o4
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	mov %i4, %o4
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	mov %i3, %o5
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	mov %i5, %o5
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.endif
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.endif
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707
 
706
	/*
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	/*
707
	 * Mark the CANRESTORE windows as OTHER windows.
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	 * Mark the CANRESTORE windows as OTHER windows.
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	 */
710
	 */
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740
	
739
	/*
741
	/*
740
	 * Copy arguments.
742
	 * Copy arguments.
741
	 */
743
	 */
742
	mov %g1, %l0
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	mov %g1, %l0
-
 
745
.if NOT(\is_syscall)
743
	mov %g2, %o0
746
	mov %g2, %o0
-
 
747
.else
-
 
748
	! store the syscall number on the stack as 7th argument
-
 
749
	stx %g2, [%sp + STACK_WINDOW_SAVE_AREA_SIZE + STACK_BIAS + STACK_ARG6] 
-
 
750
.endif
744
 
751
 
745
	/*
752
	/*
746
	 * Save TSTATE, TPC and TNPC aside.
753
	 * Save TSTATE, TPC and TNPC aside.
747
	 */
754
	 */
748
	rdpr %tstate, %g1
755
	rdpr %tstate, %g1
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772
	
766
	wrpr %g0, 0, %tl
773
	wrpr %g0, 0, %tl
767
	wrpr %g0, PSTATE_PRIV_BIT | PSTATE_PEF_BIT, %pstate
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	wrpr %g0, PSTATE_PRIV_BIT | PSTATE_PEF_BIT, %pstate
768
	SAVE_GLOBALS
775
	SAVE_GLOBALS
769
	
776
	
-
 
777
.if NOT(\is_syscall)
770
	/*
778
	/*
771
	 * Call the higher-level handler and pass istate as second parameter.
779
	 * Call the higher-level handler and pass istate as second parameter.
772
	 */
780
	 */
773
	call %l0
781
	call %l0
774
	add %sp, PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_TNPC, %o1
782
	add %sp, PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_TNPC, %o1
775
 
-
 
776
.if \is_syscall
783
.else
777
	/*
784
	/*
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	 * Copy the value returned by the syscall.
785
	 * Call the higher-level syscall handler.
779
	 */
786
	 */
780
	mov %o0, %i0
787
	call syscall_handler
-
 
788
	nop
-
 
789
	mov %o0, %i0				! copy the value returned by the syscall
781
.endif
790
.endif
782
 
791
 
783
	RESTORE_GLOBALS
792
	RESTORE_GLOBALS
784
	rdpr %pstate, %l1			! we must preserve the PEF bit
793
	rdpr %pstate, %l1			! we must preserve the PEF bit
785
	wrpr %g0, PSTATE_AG_BIT | PSTATE_PRIV_BIT, %pstate
794
	wrpr %g0, PSTATE_AG_BIT | PSTATE_PRIV_BIT, %pstate