sparc/kernel/wof.S

3  * wof.S: Sparc window overflow handler.
29  * accessed when in the 'trap' window, 'G' means
30  * accessible in any window.  Do not change these registers
43 #define twin_tmp    l4 /* Temp reg, only usable in trap window  T */
49 	/* On a 7-window Sparc the boot code patches spnwin_*
74 	/* LOCATION: Trap Window */
80 	 * window properly in this trap handler.
105 	/* Save into the window which must be saved and do it.
110 	save	%g0, %g0, %g0		! save into the window to stash away
114 	/* LOCATION: Window to be saved */
116 	STORE_WINDOW(sp)		! stash the window
117 	restore	%g0, %g0, %g0		! go back into trap window
119 	/* LOCATION: Trap window */
128 	/* LOCATION: Trap window */
132 	 * are approaching the infamous register window trap handling
138 	 * need to save into the appropriate window without inducing
140 	 * But first, store the new user window mask calculated
147 	/* LOCATION: Window to be saved */
150 	/* LOCATION: Window to be saved */
171 	/* LOCATION: Window to be saved */
179 	restore	%g0, %g0, %g0		/* Back to trap window. */
181 	/* LOCATION: Trap window */
184 	 * the appropriate window onto the stack.
197 	/* LOCATION: Window to be saved */
201 	 * or not.  If we came from kernel mode, toss the window into
202 	 * a special buffer and proceed, the kernel _needs_ a window
212 	/* Oh well, throw this one window into the per-task window
219 	/* LOCATION: Trap Window */
221 	/* Back in the trap window, update winbuffer save count. */
225 		/* Compute new user window mask.  What we are basically
229 		 * window.  umask = ((~(%t_wim | %wim)) & valid_wim_bits)
266 	/* LOCATION: Window to be saved */
268 	/* The kernel provoked a spill window trap, but the window we
271 	 * a per-process window buffer until we can properly handle
277 	/* LOCATION: Trap window */
305 /* Now come the per-architecture window overflow stack checking routines.
315 	/* LOCATION: Window to be saved on the stack */