aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m68k/include/asm/math-emu.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/m68k/include/asm/math-emu.h')
-rw-r--r--arch/m68k/include/asm/math-emu.h315
1 files changed, 315 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/math-emu.h b/arch/m68k/include/asm/math-emu.h
new file mode 100644
index 000000000000..ddfab96403cb
--- /dev/null
+++ b/arch/m68k/include/asm/math-emu.h
@@ -0,0 +1,315 @@
1#ifndef _ASM_M68K_SETUP_H
2#define _ASM_M68K_SETUP_H
3
4#include <asm/setup.h>
5#include <linux/linkage.h>
6
7/* Status Register bits */
8
9/* accrued exception bits */
10#define FPSR_AEXC_INEX 3
11#define FPSR_AEXC_DZ 4
12#define FPSR_AEXC_UNFL 5
13#define FPSR_AEXC_OVFL 6
14#define FPSR_AEXC_IOP 7
15
16/* exception status bits */
17#define FPSR_EXC_INEX1 8
18#define FPSR_EXC_INEX2 9
19#define FPSR_EXC_DZ 10
20#define FPSR_EXC_UNFL 11
21#define FPSR_EXC_OVFL 12
22#define FPSR_EXC_OPERR 13
23#define FPSR_EXC_SNAN 14
24#define FPSR_EXC_BSUN 15
25
26/* quotient byte, assumes big-endian, of course */
27#define FPSR_QUOTIENT(fpsr) (*((signed char *) &(fpsr) + 1))
28
29/* condition code bits */
30#define FPSR_CC_NAN 24
31#define FPSR_CC_INF 25
32#define FPSR_CC_Z 26
33#define FPSR_CC_NEG 27
34
35
36/* Control register bits */
37
38/* rounding mode */
39#define FPCR_ROUND_RN 0 /* round to nearest/even */
40#define FPCR_ROUND_RZ 1 /* round to zero */
41#define FPCR_ROUND_RM 2 /* minus infinity */
42#define FPCR_ROUND_RP 3 /* plus infinity */
43
44/* rounding precision */
45#define FPCR_PRECISION_X 0 /* long double */
46#define FPCR_PRECISION_S 1 /* double */
47#define FPCR_PRECISION_D 2 /* float */
48
49
50/* Flags to select the debugging output */
51#define PDECODE 0
52#define PEXECUTE 1
53#define PCONV 2
54#define PNORM 3
55#define PREGISTER 4
56#define PINSTR 5
57#define PUNIMPL 6
58#define PMOVEM 7
59
60#define PMDECODE (1<<PDECODE)
61#define PMEXECUTE (1<<PEXECUTE)
62#define PMCONV (1<<PCONV)
63#define PMNORM (1<<PNORM)
64#define PMREGISTER (1<<PREGISTER)
65#define PMINSTR (1<<PINSTR)
66#define PMUNIMPL (1<<PUNIMPL)
67#define PMMOVEM (1<<PMOVEM)
68
69#ifndef __ASSEMBLY__
70
71#include <linux/kernel.h>
72#include <linux/sched.h>
73
74union fp_mant64 {
75 unsigned long long m64;
76 unsigned long m32[2];
77};
78
79union fp_mant128 {
80 unsigned long long m64[2];
81 unsigned long m32[4];
82};
83
84/* internal representation of extended fp numbers */
85struct fp_ext {
86 unsigned char lowmant;
87 unsigned char sign;
88 unsigned short exp;
89 union fp_mant64 mant;
90};
91
92/* C representation of FPU registers */
93/* NOTE: if you change this, you have to change the assembler offsets
94 below and the size in <asm/fpu.h>, too */
95struct fp_data {
96 struct fp_ext fpreg[8];
97 unsigned int fpcr;
98 unsigned int fpsr;
99 unsigned int fpiar;
100 unsigned short prec;
101 unsigned short rnd;
102 struct fp_ext temp[2];
103};
104
105#ifdef FPU_EMU_DEBUG
106extern unsigned int fp_debugprint;
107
108#define dprint(bit, fmt, args...) ({ \
109 if (fp_debugprint & (1 << (bit))) \
110 printk(fmt, ## args); \
111})
112#else
113#define dprint(bit, fmt, args...)
114#endif
115
116#define uprint(str) ({ \
117 static int __count = 3; \
118 \
119 if (__count > 0) { \
120 printk("You just hit an unimplemented " \
121 "fpu instruction (%s)\n", str); \
122 printk("Please report this to ....\n"); \
123 __count--; \
124 } \
125})
126
127#define FPDATA ((struct fp_data *)current->thread.fp)
128
129#else /* __ASSEMBLY__ */
130
131#define FPDATA %a2
132
133/* offsets from the base register to the floating point data in the task struct */
134#define FPD_FPREG (TASK_THREAD+THREAD_FPREG+0)
135#define FPD_FPCR (TASK_THREAD+THREAD_FPREG+96)
136#define FPD_FPSR (TASK_THREAD+THREAD_FPREG+100)
137#define FPD_FPIAR (TASK_THREAD+THREAD_FPREG+104)
138#define FPD_PREC (TASK_THREAD+THREAD_FPREG+108)
139#define FPD_RND (TASK_THREAD+THREAD_FPREG+110)
140#define FPD_TEMPFP1 (TASK_THREAD+THREAD_FPREG+112)
141#define FPD_TEMPFP2 (TASK_THREAD+THREAD_FPREG+124)
142#define FPD_SIZEOF (TASK_THREAD+THREAD_FPREG+136)
143
144/* offsets on the stack to access saved registers,
145 * these are only used during instruction decoding
146 * where we always know how deep we're on the stack.
147 */
148#define FPS_DO (PT_D0)
149#define FPS_D1 (PT_D1)
150#define FPS_D2 (PT_D2)
151#define FPS_A0 (PT_A0)
152#define FPS_A1 (PT_A1)
153#define FPS_A2 (PT_A2)
154#define FPS_SR (PT_SR)
155#define FPS_PC (PT_PC)
156#define FPS_EA (PT_PC+6)
157#define FPS_PC2 (PT_PC+10)
158
159.macro fp_get_fp_reg
160 lea (FPD_FPREG,FPDATA,%d0.w*4),%a0
161 lea (%a0,%d0.w*8),%a0
162.endm
163
164/* Macros used to get/put the current program counter.
165 * 020/030 use a different stack frame then 040/060, for the
166 * 040/060 the return pc points already to the next location,
167 * so this only needs to be modified for jump instructions.
168 */
169.macro fp_get_pc dest
170 move.l (FPS_PC+4,%sp),\dest
171.endm
172
173.macro fp_put_pc src,jump=0
174 move.l \src,(FPS_PC+4,%sp)
175.endm
176
177.macro fp_get_instr_data f,s,dest,label
178 getuser \f,%sp@(FPS_PC+4)@(0),\dest,\label,%sp@(FPS_PC+4)
179 addq.l #\s,%sp@(FPS_PC+4)
180.endm
181
182.macro fp_get_instr_word dest,label,addr
183 fp_get_instr_data w,2,\dest,\label,\addr
184.endm
185
186.macro fp_get_instr_long dest,label,addr
187 fp_get_instr_data l,4,\dest,\label,\addr
188.endm
189
190/* These macros are used to read from/write to user space
191 * on error we jump to the fixup section, load the fault
192 * address into %a0 and jump to the exit.
193 * (derived from <asm/uaccess.h>)
194 */
195.macro getuser size,src,dest,label,addr
196| printf ,"[\size<%08x]",1,\addr
197.Lu1\@: moves\size \src,\dest
198
199 .section .fixup,"ax"
200 .even
201.Lu2\@: move.l \addr,%a0
202 jra \label
203 .previous
204
205 .section __ex_table,"a"
206 .align 4
207 .long .Lu1\@,.Lu2\@
208 .previous
209.endm
210
211.macro putuser size,src,dest,label,addr
212| printf ,"[\size>%08x]",1,\addr
213.Lu1\@: moves\size \src,\dest
214.Lu2\@:
215
216 .section .fixup,"ax"
217 .even
218.Lu3\@: move.l \addr,%a0
219 jra \label
220 .previous
221
222 .section __ex_table,"a"
223 .align 4
224 .long .Lu1\@,.Lu3\@
225 .long .Lu2\@,.Lu3\@
226 .previous
227.endm
228
229/* work around binutils idiocy */
230old_gas=-1
231.irp gas_ident.x .x
232old_gas=old_gas+1
233.endr
234.if !old_gas
235.irp m b,w,l
236.macro getuser.\m src,dest,label,addr
237 getuser .\m,\src,\dest,\label,\addr
238.endm
239.macro putuser.\m src,dest,label,addr
240 putuser .\m,\src,\dest,\label,\addr
241.endm
242.endr
243.endif
244
245.macro movestack nr,arg1,arg2,arg3,arg4,arg5
246 .if \nr
247 movestack (\nr-1),\arg2,\arg3,\arg4,\arg5
248 move.l \arg1,-(%sp)
249 .endif
250.endm
251
252.macro printf bit=-1,string,nr=0,arg1,arg2,arg3,arg4,arg5
253#ifdef FPU_EMU_DEBUG
254 .data
255.Lpdata\@:
256 .string "\string"
257 .previous
258
259 movem.l %d0/%d1/%a0/%a1,-(%sp)
260 .if \bit+1
261#if 0
262 moveq #\bit,%d0
263 andw #7,%d0
264 btst %d0,fp_debugprint+((31-\bit)/8)
265#else
266 btst #\bit,fp_debugprint+((31-\bit)/8)
267#endif
268 jeq .Lpskip\@
269 .endif
270 movestack \nr,\arg1,\arg2,\arg3,\arg4,\arg5
271 pea .Lpdata\@
272 jsr printk
273 lea ((\nr+1)*4,%sp),%sp
274.Lpskip\@:
275 movem.l (%sp)+,%d0/%d1/%a0/%a1
276#endif
277.endm
278
279.macro printx bit,fp
280#ifdef FPU_EMU_DEBUG
281 movem.l %d0/%a0,-(%sp)
282 lea \fp,%a0
283#if 0
284 moveq #'+',%d0
285 tst.w (%a0)
286 jeq .Lx1\@
287 moveq #'-',%d0
288.Lx1\@: printf \bit," %c",1,%d0
289 move.l (4,%a0),%d0
290 bclr #31,%d0
291 jne .Lx2\@
292 printf \bit,"0."
293 jra .Lx3\@
294.Lx2\@: printf \bit,"1."
295.Lx3\@: printf \bit,"%08x%08x",2,%d0,%a0@(8)
296 move.w (2,%a0),%d0
297 ext.l %d0
298 printf \bit,"E%04x",1,%d0
299#else
300 printf \bit," %08x%08x%08x",3,%a0@,%a0@(4),%a0@(8)
301#endif
302 movem.l (%sp)+,%d0/%a0
303#endif
304.endm
305
306.macro debug instr,args
307#ifdef FPU_EMU_DEBUG
308 \instr \args
309#endif
310.endm
311
312
313#endif /* __ASSEMBLY__ */
314
315#endif /* _ASM_M68K_SETUP_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-12 09:54:02 -0500