1 /* Machine-dependent software floating-point definitions.
2    Sparc userland (_Q_*) version.
3    Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
4    This file is part of the GNU C Library.
5    Contributed by Richard Henderson (rth@cygnus.com),
6 		  Jakub Jelinek (jj@ultra.linux.cz),
7 		  David S. Miller (davem@redhat.com) and
8 		  Peter Maydell (pmaydell@chiark.greenend.org.uk).
9 
10    The GNU C Library is free software; you can redistribute it and/or
11    modify it under the terms of the GNU Library General Public License as
12    published by the Free Software Foundation; either version 2 of the
13    License, or (at your option) any later version.
14 
15    The GNU C Library is distributed in the hope that it will be useful,
16    but WITHOUT ANY WARRANTY; without even the implied warranty of
17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18    Library General Public License for more details.
19 
20    You should have received a copy of the GNU Library General Public
21    License along with the GNU C Library; see the file COPYING.LIB.  If
22    not, write to the Free Software Foundation, Inc.,
23    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
24 
25 #ifndef _SFP_MACHINE_H
26 #define _SFP_MACHINE_H
27 
28 
29 #define _FP_W_TYPE_SIZE		32
30 #define _FP_W_TYPE		unsigned long
31 #define _FP_WS_TYPE		signed long
32 #define _FP_I_TYPE		long
33 
34 #define _FP_MUL_MEAT_S(R,X,Y)					\
35   _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
36 #define _FP_MUL_MEAT_D(R,X,Y)					\
37   _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
38 #define _FP_MUL_MEAT_Q(R,X,Y)					\
39   _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
40 
41 #define _FP_DIV_MEAT_S(R,X,Y)	_FP_DIV_MEAT_1_udiv(S,R,X,Y)
42 #define _FP_DIV_MEAT_D(R,X,Y)	_FP_DIV_MEAT_2_udiv(D,R,X,Y)
43 #define _FP_DIV_MEAT_Q(R,X,Y)	_FP_DIV_MEAT_4_udiv(Q,R,X,Y)
44 
45 #define _FP_NANFRAC_S		((_FP_QNANBIT_S << 1) - 1)
46 #define _FP_NANFRAC_D		((_FP_QNANBIT_D << 1) - 1), -1
47 #define _FP_NANFRAC_Q		((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
48 #define _FP_NANSIGN_S		0
49 #define _FP_NANSIGN_D		0
50 #define _FP_NANSIGN_Q		0
51 
52 #define _FP_KEEPNANFRACP 1
53 
54 /* If one NaN is signaling and the other is not,
55  * we choose that one, otherwise we choose X.
56  */
57 /* For _Qp_* and _Q_*, this should prefer X, for
58  * CPU instruction emulation this should prefer Y.
59  * (see SPAMv9 B.2.2 section).
60  */
61 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)			\
62   do {								\
63     if ((_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)		\
64 	&& !(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs))	\
65       {								\
66 	R##_s = X##_s;						\
67 	_FP_FRAC_COPY_##wc(R,X);				\
68       }								\
69     else							\
70       {								\
71 	R##_s = Y##_s;						\
72 	_FP_FRAC_COPY_##wc(R,Y);				\
73       }								\
74     R##_c = FP_CLS_NAN;						\
75   } while (0)
76 
77 /* Some assembly to speed things up. */
78 #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)			\
79   __asm__ ("addcc %r7,%8,%2\n\t"					\
80 	   "addxcc %r5,%6,%1\n\t"					\
81 	   "addx %r3,%4,%0\n"						\
82 	   : "=r" (r2),							\
83 	     "=&r" (r1),						\
84 	     "=&r" (r0)							\
85 	   : "%rJ" ((USItype)(x2)),					\
86 	     "rI" ((USItype)(y2)),					\
87 	     "%rJ" ((USItype)(x1)),					\
88 	     "rI" ((USItype)(y1)),					\
89 	     "%rJ" ((USItype)(x0)),					\
90 	     "rI" ((USItype)(y0))					\
91 	   : "cc")
92 
93 #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)			\
94   __asm__ ("subcc %r7,%8,%2\n\t"					\
95 	    "subxcc %r5,%6,%1\n\t"					\
96 	    "subx %r3,%4,%0\n"						\
97 	   : "=r" (r2),							\
98 	     "=&r" (r1),						\
99 	     "=&r" (r0)							\
100 	   : "%rJ" ((USItype)(x2)),					\
101 	     "rI" ((USItype)(y2)),					\
102 	     "%rJ" ((USItype)(x1)),					\
103 	     "rI" ((USItype)(y1)),					\
104 	     "%rJ" ((USItype)(x0)),					\
105 	     "rI" ((USItype)(y0))					\
106 	   : "cc")
107 
108 #define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)		\
109   do {									\
110     /* We need to fool gcc,  as we need to pass more than 10		\
111        input/outputs.  */						\
112     register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2");		\
113     __asm__ __volatile__ (						\
114 	    "addcc %r8,%9,%1\n\t"					\
115 	    "addxcc %r6,%7,%0\n\t"					\
116 	    "addxcc %r4,%5,%%g2\n\t"					\
117 	    "addx %r2,%3,%%g1\n\t"					\
118 	   : "=&r" (r1),						\
119 	     "=&r" (r0)							\
120 	   : "%rJ" ((USItype)(x3)),					\
121 	     "rI" ((USItype)(y3)),					\
122 	     "%rJ" ((USItype)(x2)),					\
123 	     "rI" ((USItype)(y2)),					\
124 	     "%rJ" ((USItype)(x1)),					\
125 	     "rI" ((USItype)(y1)),					\
126 	     "%rJ" ((USItype)(x0)),					\
127 	     "rI" ((USItype)(y0))					\
128 	   : "cc", "g1", "g2");						\
129     __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2));			\
130     r3 = _t1; r2 = _t2;							\
131   } while (0)
132 
133 #define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)		\
134   do {									\
135     /* We need to fool gcc,  as we need to pass more than 10		\
136        input/outputs.  */						\
137     register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2");		\
138     __asm__ __volatile__ (						\
139 	    "subcc %r8,%9,%1\n\t"					\
140 	    "subxcc %r6,%7,%0\n\t"					\
141 	    "subxcc %r4,%5,%%g2\n\t"					\
142 	    "subx %r2,%3,%%g1\n\t"					\
143 	   : "=&r" (r1),						\
144 	     "=&r" (r0)							\
145 	   : "%rJ" ((USItype)(x3)),					\
146 	     "rI" ((USItype)(y3)),					\
147 	     "%rJ" ((USItype)(x2)),					\
148 	     "rI" ((USItype)(y2)),					\
149 	     "%rJ" ((USItype)(x1)),					\
150 	     "rI" ((USItype)(y1)),					\
151 	     "%rJ" ((USItype)(x0)),					\
152 	     "rI" ((USItype)(y0))					\
153 	   : "cc", "g1", "g2");						\
154     __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2));			\
155     r3 = _t1; r2 = _t2;							\
156   } while (0)
157 
158 #define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
159 
160 #define __FP_FRAC_DEC_4(x3,x2,x1,x0,y3,y2,y1,y0) __FP_FRAC_SUB_4(x3,x2,x1,x0,x3,x2,x1,x0,y3,y2,y1,y0)
161 
162 #define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i)					\
163   __asm__ ("addcc %3,%4,%3\n\t"						\
164 	   "addxcc %2,%%g0,%2\n\t"					\
165 	   "addxcc %1,%%g0,%1\n\t"					\
166 	   "addx %0,%%g0,%0\n\t"					\
167 	   : "=&r" (x3),						\
168 	     "=&r" (x2),						\
169 	     "=&r" (x1),						\
170 	     "=&r" (x0)							\
171 	   : "rI" ((USItype)(i)),					\
172 	     "0" ((USItype)(x3)),					\
173 	     "1" ((USItype)(x2)),					\
174 	     "2" ((USItype)(x1)),					\
175 	     "3" ((USItype)(x0))					\
176 	   : "cc")
177 
178 #ifndef CONFIG_SMP
179 extern struct task_struct *last_task_used_math;
180 #endif
181 
182 /* Obtain the current rounding mode. */
183 #ifndef FP_ROUNDMODE
184 #ifdef CONFIG_SMP
185 #define FP_ROUNDMODE	((current->thread.fsr >> 30) & 0x3)
186 #else
187 #define FP_ROUNDMODE	((last_task_used_math->thread.fsr >> 30) & 0x3)
188 #endif
189 #endif
190 
191 /* Exception flags. */
192 #define FP_EX_INVALID		(1 << 4)
193 #define FP_EX_OVERFLOW		(1 << 3)
194 #define FP_EX_UNDERFLOW		(1 << 2)
195 #define FP_EX_DIVZERO		(1 << 1)
196 #define FP_EX_INEXACT		(1 << 0)
197 
198 #define FP_HANDLE_EXCEPTIONS return _fex
199 
200 #ifdef CONFIG_SMP
201 #define FP_INHIBIT_RESULTS ((current->thread.fsr >> 23) & _fex)
202 #else
203 #define FP_INHIBIT_RESULTS ((last_task_used_math->thread.fsr >> 23) & _fex)
204 #endif
205 
206 #ifdef CONFIG_SMP
207 #define FP_TRAPPING_EXCEPTIONS ((current->thread.fsr >> 23) & 0x1f)
208 #else
209 #define FP_TRAPPING_EXCEPTIONS ((last_task_used_math->thread.fsr >> 23) & 0x1f)
210 #endif
211 
212 #endif
213