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$NetBSD: patch-bc,v 1.2 1998/08/07 11:09:11 agc Exp $
--- /dev/null Fri Jun 19 02:02:36 1998
+++ config/unix/alpha_netbsd/rswitch.s Fri Jun 19 02:47:53 1998
@@ -0,0 +1,46 @@
+/*
+ * coswitch(old_cs, new_cs, first) for Dec Alpha architecture
+ * $16 $17 $18
+ */
+ .data
+errmsg: .ascii "new_context() returned in coswitch\X00"
+
+ .text
+ .globl coswitch
+ .ent coswitch
+coswitch:
+ lda $sp, -72($sp) /* make room on stack */
+ stq $sp, 0($16) /* save stack pointer */
+ stq $9, 0($sp) /* save registers on stack */
+ stq $10, 8($sp)
+ stq $11, 16($sp)
+ stq $12, 24($sp)
+ stq $13, 32($sp)
+ stq $14, 40($sp)
+ stq $15, 48($sp)
+ stq $27, 56($sp)
+ stq $26, 64($sp) /* return address */
+ beq $18, first /* if first time */
+
+ ldq $sp, 0($17) /* load new stack pointer */
+ ldq $9, 0($sp) /* load registers from stack */
+ ldq $10, 8($sp)
+ ldq $11, 16($sp)
+ ldq $12, 24($sp)
+ ldq $13, 32($sp)
+ ldq $14, 40($sp)
+ ldq $15, 48($sp)
+ ldq $27, 56($sp)
+ ldq $26, 64($sp) /* return address */
+ lda $sp, 72($sp) /* reset sp */
+ jsr_coroutine $31, ($26), 0 /* jump into new_context */
+
+first:
+ ldq $sp, 0($17) /* load stack pointer only */
+ bis $31, $31, $16 /* r16 = 0 */
+ bis $31, $31, $17 /* r17 = 0 */
+ jsr $26, new_context /* new_context(0,0) */
+ lda $16, errmsg
+ jsr $26, syserr /* shouldn't get here */
+
+ .end coswitch
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