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Diffstat (limited to 'src/pkg/runtime/arm/vlrt.c')
| -rw-r--r-- | src/pkg/runtime/arm/vlrt.c | 816 |
1 files changed, 816 insertions, 0 deletions
diff --git a/src/pkg/runtime/arm/vlrt.c b/src/pkg/runtime/arm/vlrt.c new file mode 100644 index 000000000..50f33710b --- /dev/null +++ b/src/pkg/runtime/arm/vlrt.c @@ -0,0 +1,816 @@ +// Inferno's libkern/vlrt-arm.c +// http://code.google.com/p/inferno-os/source/browse/libkern/vlrt-arm.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. + +// declared here to avoid include of runtime.h +void runtime·panicstring(char*); + +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)) + +void +runtime·panicdivide(void) +{ + runtime·panicstring("integer divide by zero"); +} + +typedef struct Vlong Vlong; +struct Vlong +{ + union + { + struct + { + ulong lo; + ulong hi; + }; + struct + { + ushort lols; + ushort loms; + ushort hils; + ushort hims; + }; + }; +}; + +void runtime·abort(void); + +void +_addv(Vlong *r, Vlong a, Vlong b) +{ + ulong lo, hi; + + lo = a.lo + b.lo; + hi = a.hi + b.hi; + if(lo < a.lo) + hi++; + r->lo = lo; + r->hi = hi; +} + +void +_subv(Vlong *r, Vlong a, Vlong b) +{ + ulong lo, hi; + + lo = a.lo - b.lo; + hi = a.hi - b.hi; + if(lo > a.lo) + hi--; + r->lo = lo; + r->hi = hi; +} + +void +_d2v(Vlong *y, double d) +{ + union { double d; struct Vlong; } x; + ulong xhi, xlo, ylo, yhi; + int sh; + + x.d = d; + + xhi = (x.hi & 0xfffff) | 0x100000; + xlo = x.lo; + sh = 1075 - ((x.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 <= 11) { + ylo = xlo << sh; + yhi = (xhi << sh) | (xlo >> (32-sh)); + } else { + /* overflow */ + yhi = d; /* causes something awful */ + } + } + if(x.hi & SIGN(32)) { + if(ylo != 0) { + ylo = -ylo; + yhi = ~yhi; + } else + yhi = -yhi; + } + + y->hi = yhi; + y->lo = ylo; +} + +void +_f2v(Vlong *y, float f) +{ + _d2v(y, f); +} + +void +runtime·float64toint64(double d, Vlong y) +{ + _d2v(&y, d); +} + +void +runtime·float64touint64(double d, Vlong y) +{ + _d2v(&y, d); +} + +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 x.hi*4294967296. + _ul2d(x.lo); +} + +float +_v2f(Vlong x) +{ + return _v2d(x); +} + +void +runtime·int64tofloat64(Vlong y, double d) +{ + d = _v2d(y); +} + +void +runtime·uint64tofloat64(Vlong y, double d) +{ + d = _ul2d(y.hi)*4294967296. + _ul2d(y.lo); +} + +static void +dodiv(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; + } +} + +void +_divvu(Vlong *q, Vlong n, Vlong d) +{ + + if(n.hi == 0 && d.hi == 0) { + q->hi = 0; + q->lo = n.lo / d.lo; + return; + } + dodiv(n, d, q, 0); +} + +void +runtime·uint64div(Vlong n, Vlong d, Vlong q) +{ + _divvu(&q, n, d); +} + +void +_modvu(Vlong *r, Vlong n, Vlong d) +{ + + if(n.hi == 0 && d.hi == 0) { + r->hi = 0; + r->lo = n.lo % d.lo; + return; + } + dodiv(n, d, 0, r); +} + +void +runtime·uint64mod(Vlong n, Vlong d, Vlong q) +{ + _modvu(&q, n, d); +} + +static void +vneg(Vlong *v) +{ + + if(v->lo == 0) { + v->hi = -v->hi; + return; + } + v->lo = -v->lo; + v->hi = ~v->hi; +} + +void +_divv(Vlong *q, Vlong n, Vlong d) +{ + long nneg, dneg; + + 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 wrong sign + q->lo = 0x80000000; + q->hi = 0; + return; + } + q->lo = (long)n.lo / (long)d.lo; + q->hi = ((long)q->lo) >> 31; + return; + } + 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); +} + +void +runtime·int64div(Vlong n, Vlong d, Vlong q) +{ + _divv(&q, n, d); +} + +void +_modv(Vlong *r, Vlong n, Vlong d) +{ + long nneg, dneg; + + if(n.hi == (((long)n.lo)>>31) && d.hi == (((long)d.lo)>>31)) { + r->lo = (long)n.lo % (long)d.lo; + r->hi = ((long)r->lo) >> 31; + return; + } + 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); +} + +void +runtime·int64mod(Vlong n, Vlong d, Vlong q) +{ + _modv(&q, n, d); +} + +void +_rshav(Vlong *r, Vlong a, int b) +{ + long t; + + 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->lo = t >> (b-32); + return; + } + if(b <= 0) { + r->hi = t; + r->lo = a.lo; + return; + } + r->hi = t >> b; + r->lo = (t << (32-b)) | (a.lo >> b); +} + +void +_rshlv(Vlong *r, Vlong a, int b) +{ + ulong t; + + t = a.hi; + if(b >= 32) { + r->hi = 0; + if(b >= 64) { + /* this is illegal re C standard */ + r->lo = 0; + return; + } + r->lo = t >> (b-32); + return; + } + if(b <= 0) { + r->hi = t; + r->lo = a.lo; + return; + } + r->hi = t >> b; + r->lo = (t << (32-b)) | (a.lo >> b); +} + +void +_lshv(Vlong *r, Vlong a, int b) +{ + ulong t; + + t = a.lo; + if(b >= 32) { + r->lo = 0; + if(b >= 64) { + /* this is illegal re C standard */ + r->hi = 0; + return; + } + r->hi = t << (b-32); + return; + } + if(b <= 0) { + r->lo = t; + r->hi = a.hi; + return; + } + r->lo = t << b; + r->hi = (t >> (32-b)) | (a.hi << b); +} + +void +_andv(Vlong *r, Vlong a, Vlong b) +{ + r->hi = a.hi & b.hi; + r->lo = a.lo & b.lo; +} + +void +_orv(Vlong *r, Vlong a, Vlong b) +{ + r->hi = a.hi | b.hi; + r->lo = a.lo | b.lo; +} + +void +_xorv(Vlong *r, Vlong a, Vlong b) +{ + r->hi = a.hi ^ b.hi; + r->lo = a.lo ^ b.lo; +} + +void +_vpp(Vlong *l, Vlong *r) +{ + + l->hi = r->hi; + l->lo = r->lo; + r->lo++; + if(r->lo == 0) + r->hi++; +} + +void +_vmm(Vlong *l, Vlong *r) +{ + + l->hi = r->hi; + l->lo = r->lo; + if(r->lo == 0) + r->hi--; + r->lo--; +} + +void +_ppv(Vlong *l, Vlong *r) +{ + + r->lo++; + if(r->lo == 0) + r->hi++; + l->hi = r->hi; + l->lo = r->lo; +} + +void +_mmv(Vlong *l, Vlong *r) +{ + + if(r->lo == 0) + r->hi--; + r->lo--; + l->hi = r->hi; + l->lo = r->lo; +} + +void +_vasop(Vlong *ret, void *lv, void fn(Vlong*, Vlong, Vlong), int type, Vlong rv) +{ + Vlong t, u; + + u = *ret; + switch(type) { + default: + runtime·abort(); + break; + + case 1: /* schar */ + t.lo = *(schar*)lv; + t.hi = t.lo >> 31; + fn(&u, t, rv); + *(schar*)lv = u.lo; + break; + + case 2: /* uchar */ + t.lo = *(uchar*)lv; + t.hi = 0; + fn(&u, t, rv); + *(uchar*)lv = u.lo; + break; + + case 3: /* short */ + t.lo = *(short*)lv; + t.hi = t.lo >> 31; + fn(&u, t, rv); + *(short*)lv = u.lo; + break; + + case 4: /* ushort */ + t.lo = *(ushort*)lv; + t.hi = 0; + fn(&u, t, rv); + *(ushort*)lv = u.lo; + break; + + case 9: /* int */ + t.lo = *(int*)lv; + t.hi = t.lo >> 31; + fn(&u, t, rv); + *(int*)lv = u.lo; + break; + + case 10: /* uint */ + t.lo = *(uint*)lv; + t.hi = 0; + fn(&u, t, rv); + *(uint*)lv = u.lo; + break; + + case 5: /* long */ + t.lo = *(long*)lv; + t.hi = t.lo >> 31; + fn(&u, t, rv); + *(long*)lv = u.lo; + break; + + case 6: /* ulong */ + t.lo = *(ulong*)lv; + t.hi = 0; + fn(&u, t, rv); + *(ulong*)lv = u.lo; + break; + + case 7: /* vlong */ + case 8: /* uvlong */ + fn(&u, *(Vlong*)lv, rv); + *(Vlong*)lv = u; + break; + } + *ret = u; +} + +void +_p2v(Vlong *ret, void *p) +{ + long t; + + t = (ulong)p; + ret->lo = t; + ret->hi = 0; +} + +void +_sl2v(Vlong *ret, long sl) +{ + long t; + + t = sl; + ret->lo = t; + ret->hi = t >> 31; +} + +void +_ul2v(Vlong *ret, ulong ul) +{ + long t; + + t = ul; + ret->lo = t; + ret->hi = 0; +} + +void +_si2v(Vlong *ret, int si) +{ + long t; + + t = si; + ret->lo = t; + ret->hi = t >> 31; +} + +void +_ui2v(Vlong *ret, uint ui) +{ + long t; + + t = ui; + ret->lo = t; + ret->hi = 0; +} + +void +_sh2v(Vlong *ret, long sh) +{ + long t; + + t = (sh << 16) >> 16; + ret->lo = t; + ret->hi = t >> 31; +} + +void +_uh2v(Vlong *ret, ulong ul) +{ + long t; + + t = ul & 0xffff; + ret->lo = t; + ret->hi = 0; +} + +void +_sc2v(Vlong *ret, long uc) +{ + long t; + + t = (uc << 24) >> 24; + ret->lo = t; + ret->hi = t >> 31; +} + +void +_uc2v(Vlong *ret, ulong ul) +{ + long t; + + t = ul & 0xff; + ret->lo = t; + ret->hi = 0; +} + +long +_v2sc(Vlong rv) +{ + long t; + + t = rv.lo & 0xff; + return (t << 24) >> 24; +} + +long +_v2uc(Vlong rv) +{ + + return rv.lo & 0xff; +} + +long +_v2sh(Vlong rv) +{ + long t; + + t = rv.lo & 0xffff; + return (t << 16) >> 16; +} + +long +_v2uh(Vlong rv) +{ + + return rv.lo & 0xffff; +} + +long +_v2sl(Vlong rv) +{ + + return rv.lo; +} + +long +_v2ul(Vlong rv) +{ + + return rv.lo; +} + +long +_v2si(Vlong rv) +{ + + return rv.lo; +} + +long +_v2ui(Vlong rv) +{ + + return rv.lo; +} + +int +_testv(Vlong rv) +{ + return rv.lo || rv.hi; +} + +int +_eqv(Vlong lv, Vlong rv) +{ + return lv.lo == rv.lo && lv.hi == rv.hi; +} + +int +_nev(Vlong lv, Vlong rv) +{ + return lv.lo != rv.lo || lv.hi != rv.hi; +} + +int +_ltv(Vlong lv, Vlong rv) +{ + return (long)lv.hi < (long)rv.hi || + (lv.hi == rv.hi && lv.lo < rv.lo); +} + +int +_lev(Vlong lv, Vlong rv) +{ + return (long)lv.hi < (long)rv.hi || + (lv.hi == rv.hi && lv.lo <= rv.lo); +} + +int +_gtv(Vlong lv, Vlong rv) +{ + return (long)lv.hi > (long)rv.hi || + (lv.hi == rv.hi && lv.lo > rv.lo); +} + +int +_gev(Vlong lv, Vlong rv) +{ + return (long)lv.hi > (long)rv.hi || + (lv.hi == rv.hi && lv.lo >= rv.lo); +} + +int +_lov(Vlong lv, Vlong rv) +{ + return lv.hi < rv.hi || + (lv.hi == rv.hi && lv.lo < rv.lo); +} + +int +_lsv(Vlong lv, Vlong rv) +{ + return lv.hi < rv.hi || + (lv.hi == rv.hi && lv.lo <= rv.lo); +} + +int +_hiv(Vlong lv, Vlong rv) +{ + return lv.hi > rv.hi || + (lv.hi == rv.hi && lv.lo > rv.lo); +} + +int +_hsv(Vlong lv, Vlong rv) +{ + return lv.hi > rv.hi || + (lv.hi == rv.hi && lv.lo >= rv.lo); +} |