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source: rtems/cpukit/librpc/src/xdr/xdr_float.c @ e306f333

4.104.114.84.95

Last change on this file since e306f333 was 60eae27d, checked in by Joel Sherrill <joel.sherrill@…>, on 08/09/06 at 21:03:27

2006-08-09 Kolja Waschk <waschk@…>

configure.ac, librpc/src/xdr/xdr_float.c, score/cpu/Makefile.am: New port to Altera NIOS II.

Property mode set to 100644

File size: 8.1 KB

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1	/*
2	* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3	* unrestricted use provided that this legend is included on all tape
4	* media and as a part of the software program in whole or part. Users
5	* may copy or modify Sun RPC without charge, but are not authorized
6	* to license or distribute it to anyone else except as part of a product or
7	* program developed by the user.
8	*
9	* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10	* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11	* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12	*
13	* Sun RPC is provided with no support and without any obligation on the
14	* part of Sun Microsystems, Inc. to assist in its use, correction,
15	* modification or enhancement.
16	*
17	* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18	* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19	* OR ANY PART THEREOF.
20	*
21	* In no event will Sun Microsystems, Inc. be liable for any lost revenue
22	* or profits or other special, indirect and consequential damages, even if
23	* Sun has been advised of the possibility of such damages.
24	*
25	* Sun Microsystems, Inc.
26	* 2550 Garcia Avenue
27	* Mountain View, California 94043
28	*/
29
30	#if defined(LIBC_SCCS) && !defined(lint)
31	/static char sccsid = "from: @(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";*/
32	/static char sccsid = "from: @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC";*/
33	static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_float.c,v 1.7 1999/08/28 00:02:55 peter Exp $";
34	#endif
35
36	/*
37	* xdr_float.c, Generic XDR routines impelmentation.
38	*
39	* Copyright (C) 1984, Sun Microsystems, Inc.
40	*
41	* These are the "floating point" xdr routines used to (de)serialize
42	* most common data items. See xdr.h for more info on the interface to
43	* xdr.
44	*/
45
46	#include <stdio.h>
47	#include <sys/types.h>
48	#include <sys/param.h>
49	#include <rpc/types.h>
50	#include <rpc/xdr.h>
51
52	/*
53	* NB: Not portable.
54	* This routine works on machines with IEEE754 FP and Vaxen.
55	*/
56
57	#if defined(__alpha__) \|\| \
58	defined(_AM29K) \|\| \
59	defined(__arm__) \|\| \
60	defined(__H8300__) \|\| defined(__H8300H__) \|\| defined(__H8300S__) \|\| \
61	defined(__hppa__) \|\| \
62	defined(__i386__) \|\| \
63	defined(__m68k__) \|\| defined(__mc68000__) \|\| \
64	defined(__mips__) \|\| \
65	defined(__nios2__) \|\| \
66	defined(__ns32k__) \|\| \
67	defined(__sparc__) \|\| \
68	defined(__ppc__) \|\| defined(__PPC__) \|\| \
69	defined(__sh__) \|\| \
70	defined(__AVR__)
71
72	#include <machine/endian.h>
73	#if !defined(IEEEFP)
74	#define IEEEFP
75	#endif
76
77	#elif defined(_TMS320C3x) \|\| defined(_TMS320C4x)
78	#error "Texas Instruments C3x/C4x Not supported."
79
80	#elif defined(vax)
81
82	/* What IEEE single precision floating point looks like on a Vax */
83	struct ieee_single {
84	unsigned int mantissa: 23;
85	unsigned int exp : 8;
86	unsigned int sign : 1;
87	};
88
89	/* Vax single precision floating point */
90	struct vax_single {
91	unsigned int mantissa1 : 7;
92	unsigned int exp : 8;
93	unsigned int sign : 1;
94	unsigned int mantissa2 : 16;
95	};
96
97	#define VAX_SNG_BIAS 0x81
98	#define IEEE_SNG_BIAS 0x7f
99
100	static struct sgl_limits {
101	struct vax_single s;
102	struct ieee_single ieee;
103	} sgl_limits[2] = {
104	{{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
105	{ 0x0, 0xff, 0x0 }}, /* Max IEEE */
106	{{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
107	{ 0x0, 0x0, 0x0 }} /* Min IEEE */
108	};
109	/* end of vax */
110	#else
111	#error "xdr_float.c: unknown CPU"
112	#endif
113
114
115	bool_t
116	xdr_float(xdrs, fp)
117	register XDR *xdrs;
118	register float *fp;
119	{
120	#ifdef IEEEFP
121	bool_t rv;
122	long tmpl;
123	#else
124	struct ieee_single is;
125	struct vax_single vs, *vsp;
126	struct sgl_limits *lim;
127	int i;
128	#endif
129	switch (xdrs->x_op) {
130
131	case XDR_ENCODE:
132	#ifdef IEEEFP
133	tmpl = (int32_t )fp;
134	return (XDR_PUTLONG(xdrs, &tmpl));
135	#else
136	vs = ((struct vax_single )fp);
137	for (i = 0, lim = sgl_limits;
138	i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
139	i++, lim++) {
140	if ((vs.mantissa2 == lim->s.mantissa2) &&
141	(vs.exp == lim->s.exp) &&
142	(vs.mantissa1 == lim->s.mantissa1)) {
143	is = lim->ieee;
144	goto shipit;
145	}
146	}
147	is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
148	is.mantissa = (vs.mantissa1 << 16) \| vs.mantissa2;
149	shipit:
150	is.sign = vs.sign;
151	return (XDR_PUTLONG(xdrs, (long *)&is));
152	#endif
153
154	case XDR_DECODE:
155	#ifdef IEEEFP
156	rv = XDR_GETLONG(xdrs, &tmpl);
157	(int32_t )fp = tmpl;
158	return (rv);
159	#else
160	vsp = (struct vax_single *)fp;
161	if (!XDR_GETLONG(xdrs, (long *)&is))
162	return (FALSE);
163	for (i = 0, lim = sgl_limits;
164	i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
165	i++, lim++) {
166	if ((is.exp == lim->ieee.exp) &&
167	(is.mantissa == lim->ieee.mantissa)) {
168	*vsp = lim->s;
169	goto doneit;
170	}
171	}
172	vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
173	vsp->mantissa2 = is.mantissa;
174	vsp->mantissa1 = (is.mantissa >> 16);
175	doneit:
176	vsp->sign = is.sign;
177	return (TRUE);
178	#endif
179
180	case XDR_FREE:
181	return (TRUE);
182	}
183	return (FALSE);
184	}
185
186	#ifdef vax
187	/* What IEEE double precision floating point looks like on a Vax */
188	struct ieee_double {
189	unsigned int mantissa1 : 20;
190	unsigned int exp : 11;
191	unsigned int sign : 1;
192	unsigned int mantissa2 : 32;
193	};
194
195	/* Vax double precision floating point */
196	struct vax_double {
197	unsigned int mantissa1 : 7;
198	unsigned int exp : 8;
199	unsigned int sign : 1;
200	unsigned int mantissa2 : 16;
201	unsigned int mantissa3 : 16;
202	unsigned int mantissa4 : 16;
203	};
204
205	#define VAX_DBL_BIAS 0x81
206	#define IEEE_DBL_BIAS 0x3ff
207	#define MASK(nbits) ((1 << nbits) - 1)
208
209	static struct dbl_limits {
210	struct vax_double d;
211	struct ieee_double ieee;
212	} dbl_limits[2] = {
213	{{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
214	{ 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
215	{{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
216	{ 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
217	};
218
219	#endif /* vax */
220
221
222	bool_t
223	xdr_double(xdrs, dp)
224	register XDR *xdrs;
225	double *dp;
226	{
227	#ifdef IEEEFP
228	register int32_t *i32p;
229	bool_t rv;
230	long tmpl;
231	#else
232	register long *lp;
233	struct ieee_double id;
234	struct vax_double vd;
235	register struct dbl_limits *lim;
236	int i;
237	#endif
238
239	switch (xdrs->x_op) {
240
241	case XDR_ENCODE:
242	#ifdef IEEEFP
243	i32p = (int32_t *)dp;
244	#if BYTE_ORDER == BIG_ENDIAN
245	tmpl = *i32p++;
246	rv = XDR_PUTLONG(xdrs, &tmpl);
247	if (!rv)
248	return (rv);
249	tmpl = *i32p;
250	rv = XDR_PUTLONG(xdrs, &tmpl);
251	#else
252	tmpl = *(i32p+1);
253	rv = XDR_PUTLONG(xdrs, &tmpl);
254	if (!rv)
255	return (rv);
256	tmpl = *i32p;
257	rv = XDR_PUTLONG(xdrs, &tmpl);
258	#endif
259	return (rv);
260	#else
261	vd = ((struct vax_double )dp);
262	for (i = 0, lim = dbl_limits;
263	i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
264	i++, lim++) {
265	if ((vd.mantissa4 == lim->d.mantissa4) &&
266	(vd.mantissa3 == lim->d.mantissa3) &&
267	(vd.mantissa2 == lim->d.mantissa2) &&
268	(vd.mantissa1 == lim->d.mantissa1) &&
269	(vd.exp == lim->d.exp)) {
270	id = lim->ieee;
271	goto shipit;
272	}
273	}
274	id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
275	id.mantissa1 = (vd.mantissa1 << 13) \| (vd.mantissa2 >> 3);
276	id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) \|
277	(vd.mantissa3 << 13) \|
278	((vd.mantissa4 >> 3) & MASK(13));
279	shipit:
280	id.sign = vd.sign;
281	lp = (long *)&id;
282	return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
283	#endif
284
285	case XDR_DECODE:
286	#ifdef IEEEFP
287	i32p = (int32_t *)dp;
288	#if BYTE_ORDER == BIG_ENDIAN
289	rv = XDR_GETLONG(xdrs, &tmpl);
290	*i32p++ = tmpl;
291	if (!rv)
292	return (rv);
293	rv = XDR_GETLONG(xdrs, &tmpl);
294	*i32p = tmpl;
295	#else
296	rv = XDR_GETLONG(xdrs, &tmpl);
297	*(i32p+1) = tmpl;
298	if (!rv)
299	return (rv);
300	rv = XDR_GETLONG(xdrs, &tmpl);
301	*i32p = tmpl;
302	#endif
303	return (rv);
304	#else
305	lp = (long *)&id;
306	if (!XDR_GETLONG(xdrs, lp++) \|\| !XDR_GETLONG(xdrs, lp))
307	return (FALSE);
308	for (i = 0, lim = dbl_limits;
309	i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
310	i++, lim++) {
311	if ((id.mantissa2 == lim->ieee.mantissa2) &&
312	(id.mantissa1 == lim->ieee.mantissa1) &&
313	(id.exp == lim->ieee.exp)) {
314	vd = lim->d;
315	goto doneit;
316	}
317	}
318	vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
319	vd.mantissa1 = (id.mantissa1 >> 13);
320	vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) \|
321	(id.mantissa2 >> 29);
322	vd.mantissa3 = (id.mantissa2 >> 13);
323	vd.mantissa4 = (id.mantissa2 << 3);
324	doneit:
325	vd.sign = id.sign;
326	dp = ((double *)&vd);
327	return (TRUE);
328	#endif
329
330	case XDR_FREE:
331	return (TRUE);
332	}
333	return (FALSE);
334	}

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