[src/trunk]: src/sys/arch/pmax/stand/lib Assembly routine that takes an entry...

[simonb <simonb%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8087ee3051ea
branches:  trunk
changeset: 467479:8087ee3051ea
user:      simonb <simonb%NetBSD.org@localhost>
date:      Thu Mar 25 04:08:59 1999 +0000

description:
Assembly routine that takes an entry point, new stack pointer address
and six extra arguments.  Sets up the stack pointer with the arguments
in the right registers/stack positions and calls the entry point.

diffstat:

 sys/arch/pmax/stand/lib/startprog.S |  33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diffs (37 lines):

diff -r ed4c8ea3c0c6 -r 8087ee3051ea sys/arch/pmax/stand/lib/startprog.S
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/pmax/stand/lib/startprog.S       Thu Mar 25 04:08:59 1999 +0000
@@ -0,0 +1,33 @@
+/*
+ * startprog(entry, stack, argc, argv, prom_magic, prom_ptr, bi_magic, bi_ptr);
+ *
+ * load new stack pointer, then call
+ *  entry(argc, argv, prom_magic, prom_ptr, bi_magic, bi_ptr);
+ */
+
+#include <mips/asm.h>
+
+LEAF(startprog)
+        subu    sp,sp,32
+       addu    t0,a1,-CALLFRAME_SIZ    # new stack value
+       move    t1,a0
+       move    a0,a2
+       move    a1,a3
+
+       lw      a2,48(sp)               # load everything from old stack we need
+       lw      a3,52(sp)
+       lw      v0,56(sp)
+       lw      v1,60(sp)
+
+       move    sp,t0                   # new stack pointer
+       sw      ra,24(sp)
+
+       sw      v0,16(sp)
+       sw      v1,20(sp)
+       jal     ra,t1
+       nop                             # BDslot
+
+       lw      ra,24(sp)               # should not get back here!
+       j       ra
+       addu    sp,sp,32
+END(startprog)