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$NetBSD: patch-ae,v 1.2 2016/04/14 22:04:47 dholland Exp $
Support for NetBSD.
--- src/runtime/mach-dep/SPARC.prim.asm.orig Fri Jun 15 15:05:19 2001
+++ src/runtime/mach-dep/SPARC.prim.asm
@@ -307,7 +307,7 @@ pending_sigs: /* there are pending signa
mov ALLOCPTR,LIMITPTR /* (delay slot) */
-#if defined(OPSYS_SUNOS) || defined(OPSYS_NEXTSTEP)
+#if defined(OPSYS_SUNOS) || defined(OPSYS_NEXTSTEP) || defined(OPSYS_NETBSD)
/* ZeroLimitPtr:
*
* Zero the heap limit pointer so that a trap will be generated on the next limit
@@ -622,13 +622,62 @@ _ml_mul:
mov %g1,%l1 /* save %g1 which may get trashed */
mov %g2,%l2
mov %g3,%l3
+#ifdef OPSYS_NETBSD
+ /* NetBSDs .mul trashes these */
+ mov %i4,%l4
+ mov %i5,%l5
+ mov %i0,%l6
+ mov %i1,%l7
+#endif
mov %i2,%o0
call .mul
mov %i3,%o1 /* (delay slot) */
mov %l1,%g1 /* restore %g1 */
mov %l2,%g2
mov %l3,%g3
+#ifdef OPSYS_NETBSD
+ mov %l4,%i4
+ mov %l5,%i5
+ mov %l6,%i0
+ mov %l7,%i1
+ /* the code below is a hack:
+ * NetBSDs .mul does a 32x32->64 bit signed multiply
+ * The SML code assumes that the multiply
+ * overflowed (over 32bit) if the Z flag is
+ * clear on return from .mul
+ * NetBSDs .mul doesn't do that, so we have to check
+ * for overflow. This is done in the following way:
+ * - If the upper 32 bits are clear:
+ * + if bit 31 is set => overflow
+ * + if bit 31 is clear => OK
+ * - If the upper 32 bits are != -1 => overflow
+ * - If the upper 32 bits are == -1:
+ * + If bit 31 is clear => overflow
+ * + If bit 31 is set => OK
+ *
+ * I should be shot for this code ...
+ */
+ cmp %o1,0
+ bnz 4f
+ nop
+ /* is bit 31 of %o0 set ? */
+ addcc %o0,%o0,%o1
+ bcc 2f
+ nop
+5: restore %o0,0,%o2 /* result in %o2 (delay slot) */
+ t ST_INT_OVERFLOW /* generate overflow trap */
+
+
+4: cmp %o1,-1 /* upper 32 bits == -1 ? */
+ bnz 5
+ nop
+ addcc %o0,%o0,%o1 /* bit 31 clear ? */
+ bcc 2f
+ nop
+#else
bnz 1f /* if z is clear, then overflow */
+#endif
+2:
restore %o0,0,%o2 /* result in %o2 (delay slot) */
retl
nop
@@ -642,7 +691,15 @@ _ml_mul:
* locals of the new window, since .div is a leaf routine.
*/
_ml_div:
- save %sp,-SA(WINDOWSIZE),%sp
+#ifdef OPSYS_NETBSD
+ /* hack time again: NetBSDs .div trashes too many registers
+ * we have to store them in the stack frame, so make room
+ * for six registers (o0-o5)
+ */
+ save %sp,-SA(WINDOWSIZE+24),%sp
+#else
+ save %sp,-SA(WINDOWSIZE+24),%sp
+#endif
addcc %i3,%g0,%o1 /* %o1 is divisor (and check for zero) */
bz 1f
/* save %g1, %g2 and %g3 (using new window) */
@@ -650,9 +707,30 @@ _ml_div:
mov %g1,%l1 /* (delay slot) */
mov %g2,%l2
mov %g3,%l3
+#ifdef OPSYS_NETBSD
+ /* save g6,g7,o0-o5, they get trashed.
+ Note that %o0-%o5 are now %i0-%i5, since we did a 'save'
+ Since %g6 is the global AllocPtr for SML, this
+ is rather bad :-)
+ */
+ mov %g6,%l4
+ mov %g7,%l5
+ std %i0,[%fp-16]
+ std %i2,[%fp-24]
+ std %i4,[%fp-32]
+#endif
+
call .div
mov %i2,%o0 /* (delay slot) */
/* restore %g1, %g2 and %g3 */
+#ifdef OPSYS_NETBSD
+ mov %l4,%g6
+ mov %l5,%g7
+ ldd [%fp-32],%i4
+ ldd [%fp-24],%i2
+ ldd [%fp-16],%i0
+#endif
+
mov %l3,%g3
mov %l2,%g2
mov %l1,%g1
@@ -679,11 +757,24 @@ _ml_umul:
mov %g2,%l2
mov %g3,%l3
mov %i2,%o0
+#ifdef OPSYS_NETBSD
+ /* Save what might be trashed by NetBSDs .umul */
+ mov %i4,%l4
+ mov %i5,%l5
+ mov %i0,%l6
+ mov %i1,%l7
+#endif
call .umul
mov %i3,%o1 /* (delay slot) */
mov %l1,%g1 /* restore %g1 */
mov %l2,%g2
mov %l3,%g3
+#ifdef OPSYS_NETBSD
+ mov %l4,%i4
+ mov %l5,%i5
+ mov %l6,%i0
+ mov %l7,%i1
+#endif
ret
restore %o0,0,%o2 /* result in %o2 (delay slot) */
@@ -694,7 +785,12 @@ _ml_umul:
* locals of the new window, since .div is a leaf routine.
*/
_ml_udiv:
- save %sp,-SA(WINDOWSIZE),%sp
+#ifdef OPSYS_NETBSD
+ /* see comment for _ml__div_ */
+ save %sp,-SA(WINDOWSIZE+24),%sp
+#else
+ save %sp,-SA(WINDOWSIZE+24),%sp
+#endif
addcc %i3,%g0,%o1 /* %o1 is divisor (and check for zero) */
bz 1f
/* save %g1, %g2 and %g3 (using new window) */
@@ -702,9 +798,23 @@ _ml_udiv:
mov %g1,%l1 /* (delay slot) */
mov %g2,%l2
mov %g3,%l3
+#ifdef OPSYS_NETBSD
+ mov %g6,%l4
+ mov %g7,%l5
+ std %i0,[%fp-16]
+ std %i2,[%fp-24]
+ std %i4,[%fp-32]
+#endif
call .udiv
mov %i2,%o0 /* (delay slot) */
/* restore %g1, %g2 and %g3 */
+#ifdef OPSYS_NETBSD
+ mov %l4,%g6
+ mov %l5,%g7
+ ldd [%fp-32],%i4
+ ldd [%fp-24],%i2
+ ldd [%fp-16],%i0
+#endif
mov %l3,%g3
mov %l2,%g2
mov %l1,%g1
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