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
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