ppc asm to pass vm pointer: alien + compiled code

basis/cpu/ppc/ppc.factor

@@ -466,6 +466,7 @@ M:: ppc %load-gc-root ( gc-root register -- )
 M:: ppc %call-gc ( gc-root-count temp -- )
     3 1 gc-root-base local@ ADDI
     gc-root-count 4 LI
+    5 %load-vm-addr
     "inline_gc" f %alien-invoke ;
 
 M: ppc %prologue ( n -- )
@@ -614,6 +615,7 @@ M: ppc %prepare-unbox ( -- )
 
 M: ppc %unbox ( n rep func -- )
     ! Value must be in r3
+    4 %load-vm-addr
     ! Call the unboxer
     f %alien-invoke
     ! Store the return value on the C stack
@@ -621,6 +623,7 @@ M: ppc %unbox ( n rep func -- )
 
 M: ppc %unbox-long-long ( n func -- )
     ! Value must be in r3:r4
+    4 %load-vm-addr
     ! Call the unboxer
     f %alien-invoke
     ! Store the return value on the C stack
@@ -633,15 +636,17 @@ M: ppc %unbox-large-struct ( n c-type -- )
     ! Value must be in r3
     ! Compute destination address and load struct size
     [ [ 4 1 ] dip local@ ADDI ] [ heap-size 5 LI ] bi*
+    6 %load-vm-addr
     ! Call the function
     "to_value_struct" f %alien-invoke ;
 
-M: ppc %box ( n rep func -- )
+M:: ppc %box ( n rep func -- )
     ! If the source is a stack location, load it into freg #0.
     ! If the source is f, then we assume the value is already in
     ! freg #0.
-    [ over [ 0 over reg-class-of param-reg swap %load-param-reg ] [ 2drop ] if ] dip
+    n [ 0 rep reg-class-of param-reg rep %load-param-reg ] when*
-    f %alien-invoke ;
+    rep double-rep? 5 4 ? %load-vm-addr
+    func f %alien-invoke ;
 
 M: ppc %box-long-long ( n func -- )
     [
@@ -649,6 +654,7 @@ M: ppc %box-long-long ( n func -- )
             [ [ 3 1 ] dip local@ LWZ ]
             [ [ 4 1 ] dip cell + local@ LWZ ] bi
         ] when*
+        5 %load-vm-addr
     ] dip f %alien-invoke ;
 
 : struct-return@ ( n -- n )
@@ -663,6 +669,7 @@ M: ppc %box-large-struct ( n c-type -- )
     ! If n = f, then we're boxing a returned struct
     ! Compute destination address and load struct size
     [ [ 3 1 ] dip struct-return@ ADDI ] [ heap-size 4 LI ] bi*
+    5 %load-vm-addr
     ! Call the function
     "box_value_struct" f %alien-invoke ;
 
@@ -682,9 +689,12 @@ M: ppc %alien-invoke ( symbol dll -- )
     [ 11 ] 2dip %alien-global 11 MTLR BLRL ;
 
 M: ppc %alien-callback ( quot -- )
-    3 swap %load-reference "c_to_factor" f %alien-invoke ;
+    3 swap %load-reference
+    4 %load-vm-addr
+    "c_to_factor" f %alien-invoke ;
 
 M: ppc %prepare-alien-indirect ( -- )
+    3 %load-vm-addr
     "unbox_alien" f %alien-invoke
     15 3 MR ;
 
@@ -695,6 +705,7 @@ M: ppc %callback-value ( ctype -- )
     ! Save top of data stack
     3 ds-reg 0 LWZ
     3 1 0 local@ STW
+    3 %load-vm-addr
     ! Restore data/call/retain stacks
     "unnest_stacks" f %alien-invoke
     ! Restore top of data stack
@@ -710,21 +721,25 @@ M: ppc return-struct-in-registers? ( c-type -- ? )
 M: ppc %box-small-struct ( c-type -- )
     #! Box a <= 16-byte struct returned in r3:r4:r5:r6
     heap-size 7 LI
+    8 %load-vm-addr
     "box_medium_struct" f %alien-invoke ;
 
 : %unbox-struct-1 ( -- )
     ! Alien must be in r3.
+    4 %load-vm-addr
     "alien_offset" f %alien-invoke
     3 3 0 LWZ ;
 
 : %unbox-struct-2 ( -- )
     ! Alien must be in r3.
+    4 %load-vm-addr
     "alien_offset" f %alien-invoke
     4 3 4 LWZ
     3 3 0 LWZ ;
 
 : %unbox-struct-4 ( -- )
     ! Alien must be in r3.
+    4 %load-vm-addr
     "alien_offset" f %alien-invoke
     6 3 12 LWZ
     5 3 8 LWZ
@@ -732,9 +747,11 @@ M: ppc %box-small-struct ( c-type -- )
     3 3 0 LWZ ;
 
 M: ppc %nest-stacks ( -- )
+    3 %load-vm-addr
     "nest_stacks" f %alien-invoke ;
 
 M: ppc %unnest-stacks ( -- )
+    3 %load-vm-addr
     "unnest_stacks" f %alien-invoke ;
 
 M: ppc %unbox-small-struct ( size -- )