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source: rtems/cpukit/librpc/src/xdr/xdr_float.c @ 15e44fd

4.104.115

Last change on this file since 15e44fd was 15e44fd, checked in by Joel Sherrill <joel.sherrill@…>, on 12/04/08 at 22:53:33

2008-12-04 Jukka Pietarinen <jukka.pietarinen@…>

configure.ac, librpc/src/xdr/xdr_float.c, score/cpu/Makefile.am: Add Lattice Mico32 support.

Property mode set to 100644

File size: 8.2 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(__lm32__) \|\| \
64	defined(__m68k__) \|\| defined(__mc68000__) \|\| \
65	defined(__mips__) \|\| \
66	defined(__nios2__) \|\| \
67	defined(__ns32k__) \|\| \
68	defined(__sparc__) \|\| \
69	defined(__ppc__) \|\| defined(__PPC__) \|\| \
70	defined(__sh__) \|\| \
71	defined(__AVR__) \|\| \
72	defined(__BFIN__) \|\| \
73	defined(__M32R__)
74
75	#include <rtems/endian.h>
76	#if !defined(IEEEFP)
77	#define IEEEFP
78	#endif
79
80	#elif defined(__m32c__)
81	#error "Reneseas M32C has no FPU"
82
83	#elif defined(_TMS320C3x) \|\| defined(_TMS320C4x)
84	#error "Texas Instruments C3x/C4x Not supported."
85
86	#elif defined(vax)
87
88	/* What IEEE single precision floating point looks like on a Vax */
89	struct ieee_single {
90	unsigned int mantissa: 23;
91	unsigned int exp : 8;
92	unsigned int sign : 1;
93	};
94
95	/* Vax single precision floating point */
96	struct vax_single {
97	unsigned int mantissa1 : 7;
98	unsigned int exp : 8;
99	unsigned int sign : 1;
100	unsigned int mantissa2 : 16;
101	};
102
103	#define VAX_SNG_BIAS 0x81
104	#define IEEE_SNG_BIAS 0x7f
105
106	static struct sgl_limits {
107	struct vax_single s;
108	struct ieee_single ieee;
109	} sgl_limits[2] = {
110	{{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
111	{ 0x0, 0xff, 0x0 }}, /* Max IEEE */
112	{{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
113	{ 0x0, 0x0, 0x0 }} /* Min IEEE */
114	};
115	/* end of vax */
116	#else
117	#error "xdr_float.c: unknown CPU"
118	#endif
119
120
121	bool_t
122	xdr_float(
123	register XDR *xdrs,
124	register float *fp)
125	{
126	#ifdef IEEEFP
127	bool_t rv;
128	long tmpl;
129	#else
130	struct ieee_single is;
131	struct vax_single vs, *vsp;
132	struct sgl_limits *lim;
133	int i;
134	#endif
135	switch (xdrs->x_op) {
136
137	case XDR_ENCODE:
138	#ifdef IEEEFP
139	tmpl = (int32_t )fp;
140	return (XDR_PUTLONG(xdrs, &tmpl));
141	#else
142	vs = ((struct vax_single )fp);
143	for (i = 0, lim = sgl_limits;
144	i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
145	i++, lim++) {
146	if ((vs.mantissa2 == lim->s.mantissa2) &&
147	(vs.exp == lim->s.exp) &&
148	(vs.mantissa1 == lim->s.mantissa1)) {
149	is = lim->ieee;
150	goto shipit;
151	}
152	}
153	is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
154	is.mantissa = (vs.mantissa1 << 16) \| vs.mantissa2;
155	shipit:
156	is.sign = vs.sign;
157	return (XDR_PUTLONG(xdrs, (long *)&is));
158	#endif
159
160	case XDR_DECODE:
161	#ifdef IEEEFP
162	rv = XDR_GETLONG(xdrs, &tmpl);
163	(int32_t )fp = tmpl;
164	return (rv);
165	#else
166	vsp = (struct vax_single *)fp;
167	if (!XDR_GETLONG(xdrs, (long *)&is))
168	return (FALSE);
169	for (i = 0, lim = sgl_limits;
170	i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
171	i++, lim++) {
172	if ((is.exp == lim->ieee.exp) &&
173	(is.mantissa == lim->ieee.mantissa)) {
174	*vsp = lim->s;
175	goto doneit;
176	}
177	}
178	vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
179	vsp->mantissa2 = is.mantissa;
180	vsp->mantissa1 = (is.mantissa >> 16);
181	doneit:
182	vsp->sign = is.sign;
183	return (TRUE);
184	#endif
185
186	case XDR_FREE:
187	return (TRUE);
188	}
189	return (FALSE);
190	}
191
192	#ifdef vax
193	/* What IEEE double precision floating point looks like on a Vax */
194	struct ieee_double {
195	unsigned int mantissa1 : 20;
196	unsigned int exp : 11;
197	unsigned int sign : 1;
198	unsigned int mantissa2 : 32;
199	};
200
201	/* Vax double precision floating point */
202	struct vax_double {
203	unsigned int mantissa1 : 7;
204	unsigned int exp : 8;
205	unsigned int sign : 1;
206	unsigned int mantissa2 : 16;
207	unsigned int mantissa3 : 16;
208	unsigned int mantissa4 : 16;
209	};
210
211	#define VAX_DBL_BIAS 0x81
212	#define IEEE_DBL_BIAS 0x3ff
213	#define MASK(nbits) ((1 << nbits) - 1)
214
215	static struct dbl_limits {
216	struct vax_double d;
217	struct ieee_double ieee;
218	} dbl_limits[2] = {
219	{{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
220	{ 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
221	{{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
222	{ 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
223	};
224
225	#endif /* vax */
226
227
228	bool_t
229	xdr_double(
230	register XDR *xdrs,
231	double *dp)
232	{
233	#ifdef IEEEFP
234	register int32_t *i32p;
235	bool_t rv;
236	long tmpl;
237	#else
238	register long *lp;
239	struct ieee_double id;
240	struct vax_double vd;
241	register struct dbl_limits *lim;
242	int i;
243	#endif
244
245	switch (xdrs->x_op) {
246
247	case XDR_ENCODE:
248	#ifdef IEEEFP
249	i32p = (int32_t *)dp;
250	#if BYTE_ORDER == BIG_ENDIAN
251	tmpl = *i32p++;
252	rv = XDR_PUTLONG(xdrs, &tmpl);
253	if (!rv)
254	return (rv);
255	tmpl = *i32p;
256	rv = XDR_PUTLONG(xdrs, &tmpl);
257	#else
258	tmpl = *(i32p+1);
259	rv = XDR_PUTLONG(xdrs, &tmpl);
260	if (!rv)
261	return (rv);
262	tmpl = *i32p;
263	rv = XDR_PUTLONG(xdrs, &tmpl);
264	#endif
265	return (rv);
266	#else
267	vd = ((struct vax_double )dp);
268	for (i = 0, lim = dbl_limits;
269	i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
270	i++, lim++) {
271	if ((vd.mantissa4 == lim->d.mantissa4) &&
272	(vd.mantissa3 == lim->d.mantissa3) &&
273	(vd.mantissa2 == lim->d.mantissa2) &&
274	(vd.mantissa1 == lim->d.mantissa1) &&
275	(vd.exp == lim->d.exp)) {
276	id = lim->ieee;
277	goto shipit;
278	}
279	}
280	id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
281	id.mantissa1 = (vd.mantissa1 << 13) \| (vd.mantissa2 >> 3);
282	id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) \|
283	(vd.mantissa3 << 13) \|
284	((vd.mantissa4 >> 3) & MASK(13));
285	shipit:
286	id.sign = vd.sign;
287	lp = (long *)&id;
288	return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
289	#endif
290
291	case XDR_DECODE:
292	#ifdef IEEEFP
293	i32p = (int32_t *)dp;
294	#if BYTE_ORDER == BIG_ENDIAN
295	rv = XDR_GETLONG(xdrs, &tmpl);
296	*i32p++ = tmpl;
297	if (!rv)
298	return (rv);
299	rv = XDR_GETLONG(xdrs, &tmpl);
300	*i32p = tmpl;
301	#else
302	rv = XDR_GETLONG(xdrs, &tmpl);
303	*(i32p+1) = tmpl;
304	if (!rv)
305	return (rv);
306	rv = XDR_GETLONG(xdrs, &tmpl);
307	*i32p = tmpl;
308	#endif
309	return (rv);
310	#else
311	lp = (long *)&id;
312	if (!XDR_GETLONG(xdrs, lp++) \|\| !XDR_GETLONG(xdrs, lp))
313	return (FALSE);
314	for (i = 0, lim = dbl_limits;
315	i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
316	i++, lim++) {
317	if ((id.mantissa2 == lim->ieee.mantissa2) &&
318	(id.mantissa1 == lim->ieee.mantissa1) &&
319	(id.exp == lim->ieee.exp)) {
320	vd = lim->d;
321	goto doneit;
322	}
323	}
324	vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
325	vd.mantissa1 = (id.mantissa1 >> 13);
326	vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) \|
327	(id.mantissa2 >> 29);
328	vd.mantissa3 = (id.mantissa2 >> 13);
329	vd.mantissa4 = (id.mantissa2 << 3);
330	doneit:
331	vd.sign = id.sign;
332	dp = ((double *)&vd);
333	return (TRUE);
334	#endif
335
336	case XDR_FREE:
337	return (TRUE);
338	}
339	return (FALSE);
340	}

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