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Linux/arch/frv/include/asm/math-emu.h

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  1 #ifndef _ASM_MATH_EMU_H
  2 #define _ASM_MATH_EMU_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 
 74 union fp_mant64 {
 75         unsigned long long m64;
 76         unsigned long m32[2];
 77 };
 78 
 79 union fp_mant128 {
 80         unsigned long long m64[2];
 81         unsigned long m32[4];
 82 };
 83 
 84 /* internal representation of extended fp numbers */
 85 struct 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 */
 95 struct 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 #if FPU_EMU_DEBUG
106 extern 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 
230 .macro  movestack       nr,arg1,arg2,arg3,arg4,arg5
231         .if     \nr
232         movestack       (\nr-1),\arg2,\arg3,\arg4,\arg5
233         move.l  \arg1,-(%sp)
234         .endif
235 .endm
236 
237 .macro  printf  bit=-1,string,nr=0,arg1,arg2,arg3,arg4,arg5
238 #ifdef FPU_EMU_DEBUG
239         .data
240 .Lpdata\@:
241         .string "\string"
242         .previous
243 
244         movem.l %d0/%d1/%a0/%a1,-(%sp)
245         .if     \bit+1
246 #if 0
247         moveq   #\bit,%d0
248         andw    #7,%d0
249         btst    %d0,fp_debugprint+((31-\bit)/8)
250 #else
251         btst    #\bit,fp_debugprint+((31-\bit)/8)
252 #endif
253         jeq     .Lpskip\@
254         .endif
255         movestack       \nr,\arg1,\arg2,\arg3,\arg4,\arg5
256         pea     .Lpdata\@
257         jsr     printk
258         lea     ((\nr+1)*4,%sp),%sp
259 .Lpskip\@:
260         movem.l (%sp)+,%d0/%d1/%a0/%a1
261 #endif
262 .endm
263 
264 .macro  printx  bit,fp
265 #ifdef FPU_EMU_DEBUG
266         movem.l %d0/%a0,-(%sp)
267         lea     \fp,%a0
268 #if 0
269         moveq   #'+',%d0
270         tst.w   (%a0)
271         jeq     .Lx1\@
272         moveq   #'-',%d0
273 .Lx1\@: printf  \bit," %c",1,%d0
274         move.l  (4,%a0),%d0
275         bclr    #31,%d0
276         jne     .Lx2\@
277         printf  \bit,"0."
278         jra     .Lx3\@
279 .Lx2\@: printf  \bit,"1."
280 .Lx3\@: printf  \bit,"%08x%08x",2,%d0,%a0@(8)
281         move.w  (2,%a0),%d0
282         ext.l   %d0
283         printf  \bit,"E%04x",1,%d0
284 #else
285         printf  \bit," %08x%08x%08x",3,%a0@,%a0@(4),%a0@(8)
286 #endif
287         movem.l (%sp)+,%d0/%a0
288 #endif
289 .endm
290 
291 .macro  debug   instr,args
292 #ifdef FPU_EMU_DEBUG
293         \instr  \args
294 #endif
295 .endm
296 
297 
298 #endif  /* __ASSEMBLY__ */
299 
300 #endif  /* _ASM_FRV_MATH_EMU_H */
301 
302 

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