Imported Upstream version 1.4upstream/1.4

1 files changed, 914 insertions, 0 deletions

diff --git a/src/runtime/vlrt.c b/src/runtime/vlrt.c
new file mode 100644
index 000000000..cb0d14796
--- /dev/null
+++ b/src/runtime/vlrt.c
@@ -0,0 +1,914 @@
+// Inferno's libkern/vlrt-386.c
+// http://code.google.com/p/inferno-os/source/browse/libkern/vlrt-386.c
+//
+//         Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
+//         Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.
+//         Portions Copyright 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+// +build arm 386
+
+#include "textflag.h"
+
+/*
+ * C runtime for 64-bit divide, others.
+ *
+ * TODO(rsc): The simple functions are dregs--8c knows how
+ * to generate the code directly now.  Find and remove.
+ */
+
+void	runtime·panicdivide(void);
+
+typedef	unsigned long	ulong;
+typedef	unsigned int	uint;
+typedef	unsigned short	ushort;
+typedef	unsigned char	uchar;
+typedef	signed char	schar;
+
+#define	SIGN(n)	(1UL<<(n-1))
+
+typedef	struct	Vlong	Vlong;
+struct	Vlong
+{
+	ulong	lo;
+	ulong	hi;
+};
+
+typedef	union	Vlong64	Vlong64;
+union	Vlong64
+{
+	long long	v;
+	Vlong	v2;
+};
+
+void	runtime·abort(void);
+
+#pragma textflag NOSPLIT
+Vlong
+_addv(Vlong a, Vlong b)
+{
+	Vlong r;
+
+	r.lo = a.lo + b.lo;
+	r.hi = a.hi + b.hi;
+	if(r.lo < a.lo)
+		r.hi++;
+	return r;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_subv(Vlong a, Vlong b)
+{
+	Vlong r;
+
+	r.lo = a.lo - b.lo;
+	r.hi = a.hi - b.hi;
+	if(r.lo > a.lo)
+		r.hi--;
+	return r;
+}
+
+Vlong
+_d2v(double d)
+{
+	union { double d; Vlong vl; } x;
+	ulong xhi, xlo, ylo, yhi;
+	int sh;
+	Vlong y;
+
+	x.d = d;
+
+	xhi = (x.vl.hi & 0xfffff) | 0x100000;
+	xlo = x.vl.lo;
+	sh = 1075 - ((x.vl.hi >> 20) & 0x7ff);
+
+	ylo = 0;
+	yhi = 0;
+	if(sh >= 0) {
+		/* v = (hi||lo) >> sh */
+		if(sh < 32) {
+			if(sh == 0) {
+				ylo = xlo;
+				yhi = xhi;
+			} else {
+				ylo = (xlo >> sh) | (xhi << (32-sh));
+				yhi = xhi >> sh;
+			}
+		} else {
+			if(sh == 32) {
+				ylo = xhi;
+			} else
+			if(sh < 64) {
+				ylo = xhi >> (sh-32);
+			}
+		}
+	} else {
+		/* v = (hi||lo) << -sh */
+		sh = -sh;
+		if(sh <= 10) { /* NOTE: sh <= 11 on ARM??? */
+			ylo = xlo << sh;
+			yhi = (xhi << sh) | (xlo >> (32-sh));
+		} else {
+			/* overflow */
+			yhi = d;	/* causes something awful */
+		}
+	}
+	if(x.vl.hi & SIGN(32)) {
+		if(ylo != 0) {
+			ylo = -ylo;
+			yhi = ~yhi;
+		} else
+			yhi = -yhi;
+	}
+
+	y.hi = yhi;
+	y.lo = ylo;
+	return y;
+}
+
+Vlong
+_f2v(float f)
+{
+	return _d2v(f);
+}
+
+double
+_ul2d(ulong u)
+{
+	// compensate for bug in c
+	if(u & SIGN(32)) {
+		u ^= SIGN(32);
+		return 2147483648. + u;
+	}
+	return u;
+}
+
+double
+_v2d(Vlong x)
+{
+	if(x.hi & SIGN(32)) {
+		if(x.lo) {
+			x.lo = -x.lo;
+			x.hi = ~x.hi;
+		} else
+			x.hi = -x.hi;
+		return -(_ul2d(x.hi)*4294967296. + _ul2d(x.lo));
+	}
+	return (long)x.hi*4294967296. + x.lo;
+}
+
+float
+_v2f(Vlong x)
+{
+	return _v2d(x);
+}
+
+ulong	runtime·_div64by32(Vlong, ulong, ulong*);
+int	runtime·_mul64by32(Vlong*, Vlong, ulong);
+
+static void
+slowdodiv(Vlong num, Vlong den, Vlong *q, Vlong *r)
+{
+	ulong numlo, numhi, denhi, denlo, quohi, quolo, t;
+	int i;
+
+	numhi = num.hi;
+	numlo = num.lo;
+	denhi = den.hi;
+	denlo = den.lo;
+
+	/*
+	 * get a divide by zero
+	 */
+	if(denlo==0 && denhi==0) {
+		runtime·panicdivide();
+	}
+
+	/*
+	 * set up the divisor and find the number of iterations needed
+	 */
+	if(numhi >= SIGN(32)) {
+		quohi = SIGN(32);
+		quolo = 0;
+	} else {
+		quohi = numhi;
+		quolo = numlo;
+	}
+	i = 0;
+	while(denhi < quohi || (denhi == quohi && denlo < quolo)) {
+		denhi = (denhi<<1) | (denlo>>31);
+		denlo <<= 1;
+		i++;
+	}
+
+	quohi = 0;
+	quolo = 0;
+	for(; i >= 0; i--) {
+		quohi = (quohi<<1) | (quolo>>31);
+		quolo <<= 1;
+		if(numhi > denhi || (numhi == denhi && numlo >= denlo)) {
+			t = numlo;
+			numlo -= denlo;
+			if(numlo > t)
+				numhi--;
+			numhi -= denhi;
+			quolo |= 1;
+		}
+		denlo = (denlo>>1) | (denhi<<31);
+		denhi >>= 1;
+	}
+
+	if(q) {
+		q->lo = quolo;
+		q->hi = quohi;
+	}
+	if(r) {
+		r->lo = numlo;
+		r->hi = numhi;
+	}
+}
+
+#ifdef GOARCH_arm
+static void
+dodiv(Vlong num, Vlong den, Vlong *qp, Vlong *rp)
+{
+	slowdodiv(num, den, qp, rp);
+}
+#endif
+
+#ifdef GOARCH_386
+static void
+dodiv(Vlong num, Vlong den, Vlong *qp, Vlong *rp)
+{
+	ulong n;
+	Vlong x, q, r;
+	
+	if(den.hi > num.hi || (den.hi == num.hi && den.lo > num.lo)){
+		if(qp) {
+			qp->hi = 0;
+			qp->lo = 0;
+		}
+		if(rp) {
+			rp->hi = num.hi;
+			rp->lo = num.lo;
+		}
+		return;
+	}
+
+	if(den.hi != 0){
+		q.hi = 0;
+		n = num.hi/den.hi;
+		if(runtime·_mul64by32(&x, den, n) || x.hi > num.hi || (x.hi == num.hi && x.lo > num.lo))
+			slowdodiv(num, den, &q, &r);
+		else {
+			q.lo = n;
+			*(long long*)&r = *(long long*)&num - *(long long*)&x;
+		}
+	} else {
+		if(num.hi >= den.lo){
+			if(den.lo == 0)
+				runtime·panicdivide();
+			q.hi = n = num.hi/den.lo;
+			num.hi -= den.lo*n;
+		} else {
+			q.hi = 0;
+		}
+		q.lo = runtime·_div64by32(num, den.lo, &r.lo);
+		r.hi = 0;
+	}
+	if(qp) {
+		qp->lo = q.lo;
+		qp->hi = q.hi;
+	}
+	if(rp) {
+		rp->lo = r.lo;
+		rp->hi = r.hi;
+	}
+}
+#endif
+
+Vlong
+_divvu(Vlong n, Vlong d)
+{
+	Vlong q;
+
+	if(n.hi == 0 && d.hi == 0) {
+		if(d.lo == 0)
+			runtime·panicdivide();
+		q.hi = 0;
+		q.lo = n.lo / d.lo;
+		return q;
+	}
+	dodiv(n, d, &q, 0);
+	return q;
+}
+
+Vlong
+_modvu(Vlong n, Vlong d)
+{
+	Vlong r;
+
+	if(n.hi == 0 && d.hi == 0) {
+		if(d.lo == 0)
+			runtime·panicdivide();
+		r.hi = 0;
+		r.lo = n.lo % d.lo;
+		return r;
+	}
+	dodiv(n, d, 0, &r);
+	return r;
+}
+
+static void
+vneg(Vlong *v)
+{
+
+	if(v->lo == 0) {
+		v->hi = -v->hi;
+		return;
+	}
+	v->lo = -v->lo;
+	v->hi = ~v->hi;
+}
+
+Vlong
+_divv(Vlong n, Vlong d)
+{
+	long nneg, dneg;
+	Vlong q;
+
+	if(n.hi == (((long)n.lo)>>31) && d.hi == (((long)d.lo)>>31)) {
+		if((long)n.lo == -0x80000000 && (long)d.lo == -1) {
+			// special case: 32-bit -0x80000000 / -1 causes divide error,
+			// but it's okay in this 64-bit context.
+			q.lo = 0x80000000;
+			q.hi = 0;
+			return q;
+		}
+		if(d.lo == 0)
+			runtime·panicdivide();
+		q.lo = (long)n.lo / (long)d.lo;
+		q.hi = ((long)q.lo) >> 31;
+		return q;
+	}
+	nneg = n.hi >> 31;
+	if(nneg)
+		vneg(&n);
+	dneg = d.hi >> 31;
+	if(dneg)
+		vneg(&d);
+	dodiv(n, d, &q, 0);
+	if(nneg != dneg)
+		vneg(&q);
+	return q;
+}
+
+Vlong
+_modv(Vlong n, Vlong d)
+{
+	long nneg, dneg;
+	Vlong r;
+
+	if(n.hi == (((long)n.lo)>>31) && d.hi == (((long)d.lo)>>31)) {
+		if((long)n.lo == -0x80000000 && (long)d.lo == -1) {
+			// special case: 32-bit -0x80000000 % -1 causes divide error,
+			// but it's okay in this 64-bit context.
+			r.lo = 0;
+			r.hi = 0;
+			return r;
+		}
+		if(d.lo == 0)
+			runtime·panicdivide();
+		r.lo = (long)n.lo % (long)d.lo;
+		r.hi = ((long)r.lo) >> 31;
+		return r;
+	}
+	nneg = n.hi >> 31;
+	if(nneg)
+		vneg(&n);
+	dneg = d.hi >> 31;
+	if(dneg)
+		vneg(&d);
+	dodiv(n, d, 0, &r);
+	if(nneg)
+		vneg(&r);
+	return r;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_rshav(Vlong a, int b)
+{
+	long t;
+	Vlong r;
+
+	t = a.hi;
+	if(b >= 32) {
+		r.hi = t>>31;
+		if(b >= 64) {
+			/* this is illegal re C standard */
+			r.lo = t>>31;
+			return r;
+		}
+		r.lo = t >> (b-32);
+		return r;
+	}
+	if(b <= 0) {
+		r.hi = t;
+		r.lo = a.lo;
+		return r;
+	}
+	r.hi = t >> b;
+	r.lo = (t << (32-b)) | (a.lo >> b);
+	return r;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_rshlv(Vlong a, int b)
+{
+	ulong t;
+	Vlong r;
+
+	t = a.hi;
+	if(b >= 32) {
+		r.hi = 0;
+		if(b >= 64) {
+			/* this is illegal re C standard */
+			r.lo = 0;
+			return r;
+		}
+		r.lo = t >> (b-32);
+		return r;
+	}
+	if(b <= 0) {
+		r.hi = t;
+		r.lo = a.lo;
+		return r;
+	}
+	r.hi = t >> b;
+	r.lo = (t << (32-b)) | (a.lo >> b);
+	return r;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_lshv(Vlong a, int b)
+{
+	ulong t;
+
+	t = a.lo;
+	if(b >= 32) {
+		if(b >= 64) {
+			/* this is illegal re C standard */
+			return (Vlong){0, 0};
+		}
+		return (Vlong){0, t<<(b-32)};
+	}
+	if(b <= 0) {
+		return (Vlong){t, a.hi};
+	}
+	return (Vlong){t<<b, (t >> (32-b)) | (a.hi << b)};
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_andv(Vlong a, Vlong b)
+{
+	Vlong r;
+
+	r.hi = a.hi & b.hi;
+	r.lo = a.lo & b.lo;
+	return r;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_orv(Vlong a, Vlong b)
+{
+	Vlong r;
+
+	r.hi = a.hi | b.hi;
+	r.lo = a.lo | b.lo;
+	return r;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_xorv(Vlong a, Vlong b)
+{
+	Vlong r;
+
+	r.hi = a.hi ^ b.hi;
+	r.lo = a.lo ^ b.lo;
+	return r;
+}
+
+Vlong
+_vpp(Vlong *r)
+{
+	Vlong l;
+
+	l = *r;
+	r->lo++;
+	if(r->lo == 0)
+		r->hi++;
+	return l;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_vmm(Vlong *r)
+{
+	Vlong l;
+
+	l = *r;
+	if(r->lo == 0)
+		r->hi--;
+	r->lo--;
+	return l;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_ppv(Vlong *r)
+{
+
+	r->lo++;
+	if(r->lo == 0)
+		r->hi++;
+	return *r;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_mmv(Vlong *r)
+{
+
+	if(r->lo == 0)
+		r->hi--;
+	r->lo--;
+	return *r;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_vasop(void *lv, Vlong fn(Vlong, Vlong), int type, Vlong rv)
+{
+	Vlong t, u;
+
+	u.lo = 0;
+	u.hi = 0;
+	switch(type) {
+	default:
+		runtime·abort();
+		break;
+
+	case 1:	/* schar */
+		t.lo = *(schar*)lv;
+		t.hi = t.lo >> 31;
+		u = fn(t, rv);
+		*(schar*)lv = u.lo;
+		break;
+
+	case 2:	/* uchar */
+		t.lo = *(uchar*)lv;
+		t.hi = 0;
+		u = fn(t, rv);
+		*(uchar*)lv = u.lo;
+		break;
+
+	case 3:	/* short */
+		t.lo = *(short*)lv;
+		t.hi = t.lo >> 31;
+		u = fn(t, rv);
+		*(short*)lv = u.lo;
+		break;
+
+	case 4:	/* ushort */
+		t.lo = *(ushort*)lv;
+		t.hi = 0;
+		u = fn(t, rv);
+		*(ushort*)lv = u.lo;
+		break;
+
+	case 9:	/* int */
+		t.lo = *(int*)lv;
+		t.hi = t.lo >> 31;
+		u = fn(t, rv);
+		*(int*)lv = u.lo;
+		break;
+
+	case 10:	/* uint */
+		t.lo = *(uint*)lv;
+		t.hi = 0;
+		u = fn(t, rv);
+		*(uint*)lv = u.lo;
+		break;
+
+	case 5:	/* long */
+		t.lo = *(long*)lv;
+		t.hi = t.lo >> 31;
+		u = fn(t, rv);
+		*(long*)lv = u.lo;
+		break;
+
+	case 6:	/* ulong */
+		t.lo = *(ulong*)lv;
+		t.hi = 0;
+		u = fn(t, rv);
+		*(ulong*)lv = u.lo;
+		break;
+
+	case 7:	/* vlong */
+	case 8:	/* uvlong */
+		if((void*)fn == _lshv || (void*)fn == _rshav || (void*)fn == _rshlv)
+			u = ((Vlong(*)(Vlong,int))fn)(*(Vlong*)lv, *(int*)&rv);
+		else
+			u = fn(*(Vlong*)lv, rv);
+		*(Vlong*)lv = u;
+		break;
+	}
+	return u;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_p2v(void *p)
+{
+	long t;
+	Vlong ret;
+
+	t = (ulong)p;
+	ret.lo = t;
+	ret.hi = 0;
+	return ret;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_sl2v(long sl)
+{
+	long t;
+	Vlong ret;
+
+	t = sl;
+	ret.lo = t;
+	ret.hi = t >> 31;
+	return ret;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_ul2v(ulong ul)
+{
+	long t;
+	Vlong ret;
+
+	t = ul;
+	ret.lo = t;
+	ret.hi = 0;
+	return ret;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_si2v(int si)
+{
+	return (Vlong){si, si>>31};
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_ui2v(uint ui)
+{
+	long t;
+	Vlong ret;
+
+	t = ui;
+	ret.lo = t;
+	ret.hi = 0;
+	return ret;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_sh2v(long sh)
+{
+	long t;
+	Vlong ret;
+
+	t = (sh << 16) >> 16;
+	ret.lo = t;
+	ret.hi = t >> 31;
+	return ret;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_uh2v(ulong ul)
+{
+	long t;
+	Vlong ret;
+
+	t = ul & 0xffff;
+	ret.lo = t;
+	ret.hi = 0;
+	return ret;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_sc2v(long uc)
+{
+	long t;
+	Vlong ret;
+
+	t = (uc << 24) >> 24;
+	ret.lo = t;
+	ret.hi = t >> 31;
+	return ret;
+}
+
+#pragma textflag NOSPLIT
+Vlong
+_uc2v(ulong ul)
+{
+	long t;
+	Vlong ret;
+
+	t = ul & 0xff;
+	ret.lo = t;
+	ret.hi = 0;
+	return ret;
+}
+
+#pragma textflag NOSPLIT
+long
+_v2sc(Vlong rv)
+{
+	long t;
+
+	t = rv.lo & 0xff;
+	return (t << 24) >> 24;
+}
+
+#pragma textflag NOSPLIT
+long
+_v2uc(Vlong rv)
+{
+
+	return rv.lo & 0xff;
+}
+
+#pragma textflag NOSPLIT
+long
+_v2sh(Vlong rv)
+{
+	long t;
+
+	t = rv.lo & 0xffff;
+	return (t << 16) >> 16;
+}
+
+#pragma textflag NOSPLIT
+long
+_v2uh(Vlong rv)
+{
+
+	return rv.lo & 0xffff;
+}
+
+#pragma textflag NOSPLIT
+long
+_v2sl(Vlong rv)
+{
+
+	return rv.lo;
+}
+
+#pragma textflag NOSPLIT
+long
+_v2ul(Vlong rv)
+{
+
+	return rv.lo;
+}
+
+#pragma textflag NOSPLIT
+long
+_v2si(Vlong rv)
+{
+	return rv.lo;
+}
+
+#pragma textflag NOSPLIT
+long
+_v2ui(Vlong rv)
+{
+
+	return rv.lo;
+}
+
+#pragma textflag NOSPLIT
+int
+_testv(Vlong rv)
+{
+	return rv.lo || rv.hi;
+}
+
+#pragma textflag NOSPLIT
+int
+_eqv(Vlong lv, Vlong rv)
+{
+	return lv.lo == rv.lo && lv.hi == rv.hi;
+}
+
+#pragma textflag NOSPLIT
+int
+_nev(Vlong lv, Vlong rv)
+{
+	return lv.lo != rv.lo || lv.hi != rv.hi;
+}
+
+#pragma textflag NOSPLIT
+int
+_ltv(Vlong lv, Vlong rv)
+{
+	return (long)lv.hi < (long)rv.hi ||
+		(lv.hi == rv.hi && lv.lo < rv.lo);
+}
+
+#pragma textflag NOSPLIT
+int
+_lev(Vlong lv, Vlong rv)
+{
+	return (long)lv.hi < (long)rv.hi ||
+		(lv.hi == rv.hi && lv.lo <= rv.lo);
+}
+
+#pragma textflag NOSPLIT
+int
+_gtv(Vlong lv, Vlong rv)
+{
+	return (long)lv.hi > (long)rv.hi ||
+		(lv.hi == rv.hi && lv.lo > rv.lo);
+}
+
+#pragma textflag NOSPLIT
+int
+_gev(Vlong lv, Vlong rv)
+{
+	return (long)lv.hi > (long)rv.hi ||
+		(lv.hi == rv.hi && lv.lo >= rv.lo);
+}
+
+#pragma textflag NOSPLIT
+int
+_lov(Vlong lv, Vlong rv)
+{
+	return lv.hi < rv.hi ||
+		(lv.hi == rv.hi && lv.lo < rv.lo);
+}
+
+#pragma textflag NOSPLIT
+int
+_lsv(Vlong lv, Vlong rv)
+{
+	return lv.hi < rv.hi ||
+		(lv.hi == rv.hi && lv.lo <= rv.lo);
+}
+
+#pragma textflag NOSPLIT
+int
+_hiv(Vlong lv, Vlong rv)
+{
+	return lv.hi > rv.hi ||
+		(lv.hi == rv.hi && lv.lo > rv.lo);
+}
+
+#pragma textflag NOSPLIT
+int
+_hsv(Vlong lv, Vlong rv)
+{
+	return lv.hi > rv.hi ||
+		(lv.hi == rv.hi && lv.lo >= rv.lo);
+}