xref: /openbmc/linux/arch/m68k/include/asm/math-emu.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_M68K_SETUP_H
3 #define _ASM_M68K_SETUP_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 
75 union fp_mant64 {
76 	unsigned long long m64;
77 	unsigned long m32[2];
78 };
79 
80 union fp_mant128 {
81 	unsigned long long m64[2];
82 	unsigned long m32[4];
83 };
84 
85 /* internal representation of extended fp numbers */
86 struct 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 */
96 struct 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 #ifdef FPU_EMU_DEBUG
107 extern unsigned int fp_debugprint;
108 
109 #define dprint(bit, fmt, ...) ({			\
110 	if (fp_debugprint & (1 << (bit)))		\
111 		pr_info(fmt, ##__VA_ARGS__);		\
112 })
113 #else
114 #define dprint(bit, fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
115 #endif
116 
117 #define uprint(str) ({					\
118 	static int __count = 3;				\
119 							\
120 	if (__count > 0) {				\
121 		pr_err("You just hit an unimplemented "	\
122 		       "fpu instruction (%s)\n", str);	\
123 		pr_err("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_OFF_D0)
150 #define FPS_D1		(PT_OFF_D1)
151 #define FPS_D2		(PT_OFF_D2)
152 #define FPS_A0		(PT_OFF_A0)
153 #define FPS_A1		(PT_OFF_A1)
154 #define FPS_A2		(PT_OFF_A2)
155 #define FPS_SR		(PT_OFF_SR)
156 #define FPS_PC		(PT_OFF_PC)
157 #define FPS_EA		(PT_OFF_PC+6)
158 #define FPS_PC2		(PT_OFF_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 /* work around binutils idiocy */
231 old_gas=-1
232 .irp    gas_ident.x .x
233 old_gas=old_gas+1
234 .endr
235 .if !old_gas
236 .irp	m b,w,l
237 .macro	getuser.\m src,dest,label,addr
238 	getuser .\m,\src,\dest,\label,\addr
239 .endm
240 .macro	putuser.\m src,dest,label,addr
241 	putuser .\m,\src,\dest,\label,\addr
242 .endm
243 .endr
244 .endif
245 
246 .macro	movestack	nr,arg1,arg2,arg3,arg4,arg5
247 	.if	\nr
248 	movestack	(\nr-1),\arg2,\arg3,\arg4,\arg5
249 	move.l	\arg1,-(%sp)
250 	.endif
251 .endm
252 
253 .macro	printf	bit=-1,string,nr=0,arg1,arg2,arg3,arg4,arg5
254 #ifdef FPU_EMU_DEBUG
255 	.data
256 .Lpdata\@:
257 	.string	"\string"
258 	.previous
259 
260 	movem.l	%d0/%d1/%a0/%a1,-(%sp)
261 	.if	\bit+1
262 #if 0
263 	moveq	#\bit,%d0
264 	andw	#7,%d0
265 	btst	%d0,fp_debugprint+((31-\bit)/8)
266 #else
267 	btst	#\bit,fp_debugprint+((31-\bit)/8)
268 #endif
269 	jeq	.Lpskip\@
270 	.endif
271 	movestack	\nr,\arg1,\arg2,\arg3,\arg4,\arg5
272 	pea	.Lpdata\@
273 	jsr	printk
274 	lea	((\nr+1)*4,%sp),%sp
275 .Lpskip\@:
276 	movem.l	(%sp)+,%d0/%d1/%a0/%a1
277 #endif
278 .endm
279 
280 .macro	printx	bit,fp
281 #ifdef FPU_EMU_DEBUG
282 	movem.l	%d0/%a0,-(%sp)
283 	lea	\fp,%a0
284 #if 0
285 	moveq	#'+',%d0
286 	tst.w	(%a0)
287 	jeq	.Lx1\@
288 	moveq	#'-',%d0
289 .Lx1\@:	printf	\bit," %c",1,%d0
290 	move.l	(4,%a0),%d0
291 	bclr	#31,%d0
292 	jne	.Lx2\@
293 	printf	\bit,"0."
294 	jra	.Lx3\@
295 .Lx2\@:	printf	\bit,"1."
296 .Lx3\@:	printf	\bit,"%08x%08x",2,%d0,%a0@(8)
297 	move.w	(2,%a0),%d0
298 	ext.l	%d0
299 	printf	\bit,"E%04x",1,%d0
300 #else
301 	printf	\bit," %08x%08x%08x",3,%a0@,%a0@(4),%a0@(8)
302 #endif
303 	movem.l	(%sp)+,%d0/%a0
304 #endif
305 .endm
306 
307 .macro	debug	instr,args
308 #ifdef FPU_EMU_DEBUG
309 	\instr	\args
310 #endif
311 .endm
312 
313 
314 #endif	/* __ASSEMBLY__ */
315 
316 #endif	/* _ASM_M68K_SETUP_H */
317