#include <string.h>
#include <signal.h>
-#include <memory.h>
/************************************************************************
*
mov %g1, %l4 ! Save g1, we use it to hold the wim
srl %l3, 1, %g1 ! Rotate wim right
- sll %l3, 8-1, %l5
- or %l5, %g1, %g1
+ tst %g1
+ bg good_wim ! Branch if new wim is non-zero
+! At this point, we need to bring a 1 into the high order bit of the wim.
+! Since we don't want to make any assumptions about the number of register
+! windows, we figure it out dynamically so as to setup the wim correctly.
+
+ not %g1 ! Fill g1 with ones
+ mov %g1, %wim ! Fill the wim with ones
+ nop
+ nop
+ nop
+ mov %wim, %g1 ! Read back the wim
+ inc %g1 ! Now g1 has 1 just to left of wim
+ srl %g1, 1, %g1 ! Now put 1 at top of wim
+ mov %g0, %wim ! Clear wim so that subsequent save
+ nop ! won't trap
+ nop
+ nop
+
+good_wim:
save %g0, %g0, %g0 ! Slip into next window
mov %g1, %wim ! Install the new wim
call _handle_exception
add %sp, 24 * 4, %o0 ! Pass address of registers
- restore ! Ensure that previous window is valid
- save %g0, %g0, %g0 ! by causing a window_underflow trap
-
! Reload all of the registers that aren't on the stack
ld [%sp + (24 + 1) * 4], %g1 ! registers[Gx]
ldd [%sp + (24 + 64) * 4], %l0 ! Y & PSR
ldd [%sp + (24 + 68) * 4], %l2 ! PC & NPC
+
+ restore ! Ensure that previous window is valid
+ save %g0, %g0, %g0 ! by causing a window_underflow trap
+
mov %l0, %y
mov %l1, %psr ! Make sure that traps are disabled
! for rett
break;
#if 0
case 't': /* Test feature */
- asm (" std %f31,[%sp]");
+ asm (" std %f30,[%sp]");
break;
#endif
case 'r': /* Reset */