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$NetBSD: patch-ag,v 1.7 2003/06/06 08:58:43 jtb Exp $
--- /dev/null
+++ config/netbsd/sparc.c
@@ -0,0 +1,33 @@
+/*
+ * coswitch for NetBSD SPARC
+ */
+
+int
+coswitch (int *old_cs, int *new_cs, int first)
+{
+ asm("ta 0x03"); /* ST_FLUSH_WINDOWS in trap.h */
+ asm("ld [%fp+0x44], %o0"); /* load old_cs into %o0 */
+ asm("st %sp,[%o0]"); /* Save user stack pointer */
+ asm("st %fp,[%o0+0x4]"); /* Save frame pointer */
+ asm("st %i7,[%o0+0x8]"); /* Save return address */
+
+ if (first == 0) { /* this is the first activation */
+ asm("ld [%fp+0x48], %o0"); /* load new_cs into %o0 */
+ asm("ld [%o0], %o1"); /* load %o1 from cstate[0] */
+
+ /* Decrement new stack pointer value before loading it into sp. */
+ /* The top 64 bytes of the stack are reserved for the kernel, to */
+ /* save the 8 local and 8 in registers into, on context switches, */
+ /* interrupts, traps, etc. */
+
+ asm("save %o1,-96, %sp"); /* load %sp from %o1 */
+ new_context(0,0);
+ syserr("new_context() returned in coswitch");
+
+ } else {
+ asm("ld [%fp+0x48], %o0"); /* load new_cs into %o0 */
+ asm("ld [%o0+0x4],%fp"); /* Load frame pointer */
+ asm("ld [%o0+0x8],%i7"); /* Load return address */
+ asm("ld [%o0],%sp"); /* Load user stack pointer */
+ }
+}
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