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source: rtems/cpukit/librpc/src/xdr/xdr_float.c @ 0c5b59de

4.104.115

Last change on this file since 0c5b59de was 0c5b59de, checked in by Joel Sherrill <joel.sherrill@…>, on 01/08/09 at 15:02:25

2009-01-08 Joel Sherrill <joel.sherrill@…>

librpc/src/xdr/xdr_float.c: M32C has no native float but GCC soft float should be IEEE format.

Property mode set to 100644

File size: 8.2 KB

Line
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(__m32c__) \|\| \
74	defined(__M32R__)
75
76	#include <rtems/endian.h>
77	#if !defined(IEEEFP)
78	#define IEEEFP
79	#endif
80
81	#elif defined(_TMS320C3x) \|\| defined(_TMS320C4x)
82	#error "Texas Instruments C3x/C4x Not supported."
83
84	#elif defined(vax)
85
86	/* What IEEE single precision floating point looks like on a Vax */
87	struct ieee_single {
88	unsigned int mantissa: 23;
89	unsigned int exp : 8;
90	unsigned int sign : 1;
91	};
92
93	/* Vax single precision floating point */
94	struct vax_single {
95	unsigned int mantissa1 : 7;
96	unsigned int exp : 8;
97	unsigned int sign : 1;
98	unsigned int mantissa2 : 16;
99	};
100
101	#define VAX_SNG_BIAS 0x81
102	#define IEEE_SNG_BIAS 0x7f
103
104	static struct sgl_limits {
105	struct vax_single s;
106	struct ieee_single ieee;
107	} sgl_limits[2] = {
108	{{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
109	{ 0x0, 0xff, 0x0 }}, /* Max IEEE */
110	{{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
111	{ 0x0, 0x0, 0x0 }} /* Min IEEE */
112	};
113	/* end of vax */
114	#else
115	#error "xdr_float.c: unknown CPU"
116	#endif
117
118
119	bool_t
120	xdr_float(
121	register XDR *xdrs,
122	register float *fp)
123	{
124	#ifdef IEEEFP
125	bool_t rv;
126	long tmpl;
127	#else
128	struct ieee_single is;
129	struct vax_single vs, *vsp;
130	struct sgl_limits *lim;
131	int i;
132	#endif
133	switch (xdrs->x_op) {
134
135	case XDR_ENCODE:
136	#ifdef IEEEFP
137	tmpl = (int32_t )fp;
138	return (XDR_PUTLONG(xdrs, &tmpl));
139	#else
140	vs = ((struct vax_single )fp);
141	for (i = 0, lim = sgl_limits;
142	i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
143	i++, lim++) {
144	if ((vs.mantissa2 == lim->s.mantissa2) &&
145	(vs.exp == lim->s.exp) &&
146	(vs.mantissa1 == lim->s.mantissa1)) {
147	is = lim->ieee;
148	goto shipit;
149	}
150	}
151	is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
152	is.mantissa = (vs.mantissa1 << 16) \| vs.mantissa2;
153	shipit:
154	is.sign = vs.sign;
155	return (XDR_PUTLONG(xdrs, (long *)&is));
156	#endif
157
158	case XDR_DECODE:
159	#ifdef IEEEFP
160	rv = XDR_GETLONG(xdrs, &tmpl);
161	(int32_t )fp = tmpl;
162	return (rv);
163	#else
164	vsp = (struct vax_single *)fp;
165	if (!XDR_GETLONG(xdrs, (long *)&is))
166	return (FALSE);
167	for (i = 0, lim = sgl_limits;
168	i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
169	i++, lim++) {
170	if ((is.exp == lim->ieee.exp) &&
171	(is.mantissa == lim->ieee.mantissa)) {
172	*vsp = lim->s;
173	goto doneit;
174	}
175	}
176	vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
177	vsp->mantissa2 = is.mantissa;
178	vsp->mantissa1 = (is.mantissa >> 16);
179	doneit:
180	vsp->sign = is.sign;
181	return (TRUE);
182	#endif
183
184	case XDR_FREE:
185	return (TRUE);
186	}
187	return (FALSE);
188	}
189
190	#ifdef vax
191	/* What IEEE double precision floating point looks like on a Vax */
192	struct ieee_double {
193	unsigned int mantissa1 : 20;
194	unsigned int exp : 11;
195	unsigned int sign : 1;
196	unsigned int mantissa2 : 32;
197	};
198
199	/* Vax double precision floating point */
200	struct vax_double {
201	unsigned int mantissa1 : 7;
202	unsigned int exp : 8;
203	unsigned int sign : 1;
204	unsigned int mantissa2 : 16;
205	unsigned int mantissa3 : 16;
206	unsigned int mantissa4 : 16;
207	};
208
209	#define VAX_DBL_BIAS 0x81
210	#define IEEE_DBL_BIAS 0x3ff
211	#define MASK(nbits) ((1 << nbits) - 1)
212
213	static struct dbl_limits {
214	struct vax_double d;
215	struct ieee_double ieee;
216	} dbl_limits[2] = {
217	{{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
218	{ 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
219	{{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
220	{ 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
221	};
222
223	#endif /* vax */
224
225
226	bool_t
227	xdr_double(
228	register XDR *xdrs,
229	double *dp)
230	{
231	#ifdef IEEEFP
232	register int32_t *i32p;
233	bool_t rv;
234	long tmpl;
235	#else
236	register long *lp;
237	struct ieee_double id;
238	struct vax_double vd;
239	register struct dbl_limits *lim;
240	int i;
241	#endif
242
243	switch (xdrs->x_op) {
244
245	case XDR_ENCODE:
246	#ifdef IEEEFP
247	i32p = (int32_t *)dp;
248	#if BYTE_ORDER == BIG_ENDIAN
249	tmpl = *i32p++;
250	rv = XDR_PUTLONG(xdrs, &tmpl);
251	if (!rv)
252	return (rv);
253	tmpl = *i32p;
254	rv = XDR_PUTLONG(xdrs, &tmpl);
255	#else
256	tmpl = *(i32p+1);
257	rv = XDR_PUTLONG(xdrs, &tmpl);
258	if (!rv)
259	return (rv);
260	tmpl = *i32p;
261	rv = XDR_PUTLONG(xdrs, &tmpl);
262	#endif
263	return (rv);
264	#else
265	vd = ((struct vax_double )dp);
266	for (i = 0, lim = dbl_limits;
267	i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
268	i++, lim++) {
269	if ((vd.mantissa4 == lim->d.mantissa4) &&
270	(vd.mantissa3 == lim->d.mantissa3) &&
271	(vd.mantissa2 == lim->d.mantissa2) &&
272	(vd.mantissa1 == lim->d.mantissa1) &&
273	(vd.exp == lim->d.exp)) {
274	id = lim->ieee;
275	goto shipit;
276	}
277	}
278	id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
279	id.mantissa1 = (vd.mantissa1 << 13) \| (vd.mantissa2 >> 3);
280	id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) \|
281	(vd.mantissa3 << 13) \|
282	((vd.mantissa4 >> 3) & MASK(13));
283	shipit:
284	id.sign = vd.sign;
285	lp = (long *)&id;
286	return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
287	#endif
288
289	case XDR_DECODE:
290	#ifdef IEEEFP
291	i32p = (int32_t *)dp;
292	#if BYTE_ORDER == BIG_ENDIAN
293	rv = XDR_GETLONG(xdrs, &tmpl);
294	*i32p++ = tmpl;
295	if (!rv)
296	return (rv);
297	rv = XDR_GETLONG(xdrs, &tmpl);
298	*i32p = tmpl;
299	#else
300	rv = XDR_GETLONG(xdrs, &tmpl);
301	*(i32p+1) = tmpl;
302	if (!rv)
303	return (rv);
304	rv = XDR_GETLONG(xdrs, &tmpl);
305	*i32p = tmpl;
306	#endif
307	return (rv);
308	#else
309	lp = (long *)&id;
310	if (!XDR_GETLONG(xdrs, lp++) \|\| !XDR_GETLONG(xdrs, lp))
311	return (FALSE);
312	for (i = 0, lim = dbl_limits;
313	i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
314	i++, lim++) {
315	if ((id.mantissa2 == lim->ieee.mantissa2) &&
316	(id.mantissa1 == lim->ieee.mantissa1) &&
317	(id.exp == lim->ieee.exp)) {
318	vd = lim->d;
319	goto doneit;
320	}
321	}
322	vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
323	vd.mantissa1 = (id.mantissa1 >> 13);
324	vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) \|
325	(id.mantissa2 >> 29);
326	vd.mantissa3 = (id.mantissa2 >> 13);
327	vd.mantissa4 = (id.mantissa2 << 3);
328	doneit:
329	vd.sign = id.sign;
330	dp = ((double *)&vd);
331	return (TRUE);
332	#endif
333
334	case XDR_FREE:
335	return (TRUE);
336	}
337	return (FALSE);
338	}

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