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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_MATH_EMU_H
3#define _ASM_MATH_EMU_H
4
5#include <asm/setup.h>
6#include <linux/linkage.h>
7
8/* Status Register bits */
9
10/* accrued exception bits */
11#define FPSR_AEXC_INEX 3
12#define FPSR_AEXC_DZ 4
13#define FPSR_AEXC_UNFL 5
14#define FPSR_AEXC_OVFL 6
15#define FPSR_AEXC_IOP 7
16
17/* exception status bits */
18#define FPSR_EXC_INEX1 8
19#define FPSR_EXC_INEX2 9
20#define FPSR_EXC_DZ 10
21#define FPSR_EXC_UNFL 11
22#define FPSR_EXC_OVFL 12
23#define FPSR_EXC_OPERR 13
24#define FPSR_EXC_SNAN 14
25#define FPSR_EXC_BSUN 15
26
27/* quotient byte, assumes big-endian, of course */
28#define FPSR_QUOTIENT(fpsr) (*((signed char *) &(fpsr) + 1))
29
30/* condition code bits */
31#define FPSR_CC_NAN 24
32#define FPSR_CC_INF 25
33#define FPSR_CC_Z 26
34#define FPSR_CC_NEG 27
35
36
37/* Control register bits */
38
39/* rounding mode */
40#define FPCR_ROUND_RN 0 /* round to nearest/even */
41#define FPCR_ROUND_RZ 1 /* round to zero */
42#define FPCR_ROUND_RM 2 /* minus infinity */
43#define FPCR_ROUND_RP 3 /* plus infinity */
44
45/* rounding precision */
46#define FPCR_PRECISION_X 0 /* long double */
47#define FPCR_PRECISION_S 1 /* double */
48#define FPCR_PRECISION_D 2 /* float */
49
50
51/* Flags to select the debugging output */
52#define PDECODE 0
53#define PEXECUTE 1
54#define PCONV 2
55#define PNORM 3
56#define PREGISTER 4
57#define PINSTR 5
58#define PUNIMPL 6
59#define PMOVEM 7
60
61#define PMDECODE (1<<PDECODE)
62#define PMEXECUTE (1<<PEXECUTE)
63#define PMCONV (1<<PCONV)
64#define PMNORM (1<<PNORM)
65#define PMREGISTER (1<<PREGISTER)
66#define PMINSTR (1<<PINSTR)
67#define PMUNIMPL (1<<PUNIMPL)
68#define PMMOVEM (1<<PMOVEM)
69
70#ifndef __ASSEMBLY__
71
72#include <linux/kernel.h>
73#include <linux/sched.h>
74
75union fp_mant64 {
76 unsigned long long m64;
77 unsigned long m32[2];
78};
79
80union fp_mant128 {
81 unsigned long long m64[2];
82 unsigned long m32[4];
83};
84
85/* internal representation of extended fp numbers */
86struct fp_ext {
87 unsigned char lowmant;
88 unsigned char sign;
89 unsigned short exp;
90 union fp_mant64 mant;
91};
92
93/* C representation of FPU registers */
94/* NOTE: if you change this, you have to change the assembler offsets
95 below and the size in <asm/fpu.h>, too */
96struct fp_data {
97 struct fp_ext fpreg[8];
98 unsigned int fpcr;
99 unsigned int fpsr;
100 unsigned int fpiar;
101 unsigned short prec;
102 unsigned short rnd;
103 struct fp_ext temp[2];
104};
105
106#if FPU_EMU_DEBUG
107extern unsigned int fp_debugprint;
108
109#define dprint(bit, fmt, args...) ({ \
110 if (fp_debugprint & (1 << (bit))) \
111 printk(fmt, ## args); \
112})
113#else
114#define dprint(bit, fmt, args...)
115#endif
116
117#define uprint(str) ({ \
118 static int __count = 3; \
119 \
120 if (__count > 0) { \
121 printk("You just hit an unimplemented " \
122 "fpu instruction (%s)\n", str); \
123 printk("Please report this to ....\n"); \
124 __count--; \
125 } \
126})
127
128#define FPDATA ((struct fp_data *)current->thread.fp)
129
130#else /* __ASSEMBLY__ */
131
132#define FPDATA %a2
133
134/* offsets from the base register to the floating point data in the task struct */
135#define FPD_FPREG (TASK_THREAD+THREAD_FPREG+0)
136#define FPD_FPCR (TASK_THREAD+THREAD_FPREG+96)
137#define FPD_FPSR (TASK_THREAD+THREAD_FPREG+100)
138#define FPD_FPIAR (TASK_THREAD+THREAD_FPREG+104)
139#define FPD_PREC (TASK_THREAD+THREAD_FPREG+108)
140#define FPD_RND (TASK_THREAD+THREAD_FPREG+110)
141#define FPD_TEMPFP1 (TASK_THREAD+THREAD_FPREG+112)
142#define FPD_TEMPFP2 (TASK_THREAD+THREAD_FPREG+124)
143#define FPD_SIZEOF (TASK_THREAD+THREAD_FPREG+136)
144
145/* offsets on the stack to access saved registers,
146 * these are only used during instruction decoding
147 * where we always know how deep we're on the stack.
148 */
149#define FPS_DO (PT_D0)
150#define FPS_D1 (PT_D1)
151#define FPS_D2 (PT_D2)
152#define FPS_A0 (PT_A0)
153#define FPS_A1 (PT_A1)
154#define FPS_A2 (PT_A2)
155#define FPS_SR (PT_SR)
156#define FPS_PC (PT_PC)
157#define FPS_EA (PT_PC+6)
158#define FPS_PC2 (PT_PC+10)
159
160.macro fp_get_fp_reg
161 lea (FPD_FPREG,FPDATA,%d0.w*4),%a0
162 lea (%a0,%d0.w*8),%a0
163.endm
164
165/* Macros used to get/put the current program counter.
166 * 020/030 use a different stack frame then 040/060, for the
167 * 040/060 the return pc points already to the next location,
168 * so this only needs to be modified for jump instructions.
169 */
170.macro fp_get_pc dest
171 move.l (FPS_PC+4,%sp),\dest
172.endm
173
174.macro fp_put_pc src,jump=0
175 move.l \src,(FPS_PC+4,%sp)
176.endm
177
178.macro fp_get_instr_data f,s,dest,label
179 getuser \f,%sp@(FPS_PC+4)@(0),\dest,\label,%sp@(FPS_PC+4)
180 addq.l #\s,%sp@(FPS_PC+4)
181.endm
182
183.macro fp_get_instr_word dest,label,addr
184 fp_get_instr_data w,2,\dest,\label,\addr
185.endm
186
187.macro fp_get_instr_long dest,label,addr
188 fp_get_instr_data l,4,\dest,\label,\addr
189.endm
190
191/* These macros are used to read from/write to user space
192 * on error we jump to the fixup section, load the fault
193 * address into %a0 and jump to the exit.
194 * (derived from <asm/uaccess.h>)
195 */
196.macro getuser size,src,dest,label,addr
197| printf ,"[\size<%08x]",1,\addr
198.Lu1\@: moves\size \src,\dest
199
200 .section .fixup,"ax"
201 .even
202.Lu2\@: move.l \addr,%a0
203 jra \label
204 .previous
205
206 .section __ex_table,"a"
207 .align 4
208 .long .Lu1\@,.Lu2\@
209 .previous
210.endm
211
212.macro putuser size,src,dest,label,addr
213| printf ,"[\size>%08x]",1,\addr
214.Lu1\@: moves\size \src,\dest
215.Lu2\@:
216
217 .section .fixup,"ax"
218 .even
219.Lu3\@: move.l \addr,%a0
220 jra \label
221 .previous
222
223 .section __ex_table,"a"
224 .align 4
225 .long .Lu1\@,.Lu3\@
226 .long .Lu2\@,.Lu3\@
227 .previous
228.endm
229
230
231.macro movestack nr,arg1,arg2,arg3,arg4,arg5
232 .if \nr
233 movestack (\nr-1),\arg2,\arg3,\arg4,\arg5
234 move.l \arg1,-(%sp)
235 .endif
236.endm
237
238.macro printf bit=-1,string,nr=0,arg1,arg2,arg3,arg4,arg5
239#ifdef FPU_EMU_DEBUG
240 .data
241.Lpdata\@:
242 .string "\string"
243 .previous
244
245 movem.l %d0/%d1/%a0/%a1,-(%sp)
246 .if \bit+1
247#if 0
248 moveq #\bit,%d0
249 andw #7,%d0
250 btst %d0,fp_debugprint+((31-\bit)/8)
251#else
252 btst #\bit,fp_debugprint+((31-\bit)/8)
253#endif
254 jeq .Lpskip\@
255 .endif
256 movestack \nr,\arg1,\arg2,\arg3,\arg4,\arg5
257 pea .Lpdata\@
258 jsr printk
259 lea ((\nr+1)*4,%sp),%sp
260.Lpskip\@:
261 movem.l (%sp)+,%d0/%d1/%a0/%a1
262#endif
263.endm
264
265.macro printx bit,fp
266#ifdef FPU_EMU_DEBUG
267 movem.l %d0/%a0,-(%sp)
268 lea \fp,%a0
269#if 0
270 moveq #'+',%d0
271 tst.w (%a0)
272 jeq .Lx1\@
273 moveq #'-',%d0
274.Lx1\@: printf \bit," %c",1,%d0
275 move.l (4,%a0),%d0
276 bclr #31,%d0
277 jne .Lx2\@
278 printf \bit,"0."
279 jra .Lx3\@
280.Lx2\@: printf \bit,"1."
281.Lx3\@: printf \bit,"%08x%08x",2,%d0,%a0@(8)
282 move.w (2,%a0),%d0
283 ext.l %d0
284 printf \bit,"E%04x",1,%d0
285#else
286 printf \bit," %08x%08x%08x",3,%a0@,%a0@(4),%a0@(8)
287#endif
288 movem.l (%sp)+,%d0/%a0
289#endif
290.endm
291
292.macro debug instr,args
293#ifdef FPU_EMU_DEBUG
294 \instr \args
295#endif
296.endm
297
298
299#endif /* __ASSEMBLY__ */
300
301#endif /* _ASM_FRV_MATH_EMU_H */
302