| blob | 329a5ff3df1e0aa2ce45e88b5719612633141fc7 |
1 /*
2 #
3 # $NetBSD: netbsd060sp.S,v 1.7 2001/07/12 17:17:45 scw Exp $
4 #
5 #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6 # MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
7 # M68000 Hi-Performance Microprocessor Division
8 # M68060 Software Package Production Release
9 #
10 # M68060 Software Package Copyright (C) 1993, 1994, 1995, 1996 Motorola Inc.
11 # All rights reserved.
12 #
13 # THE SOFTWARE is provided on an "AS IS" basis and without warranty.
14 # To the maximum extent permitted by applicable law,
15 # MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
16 # INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS
17 # FOR A PARTICULAR PURPOSE and any warranty against infringement with
18 # regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
19 # and any accompanying written materials.
20 #
21 # To the maximum extent permitted by applicable law,
22 # IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
23 # (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
24 # BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
25 # ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
26 #
27 # Motorola assumes no responsibility for the maintenance and support
28 # of the SOFTWARE.
29 #
30 # You are hereby granted a copyright license to use, modify, and distribute the
31 # SOFTWARE so long as this entire notice is retained without alteration
32 # in any modified and/or redistributed versions, and that such modified
33 # versions are clearly identified as such.
34 # No licenses are granted by implication, estoppel or otherwise under any
35 # patents or trademarks of Motorola, Inc.
36 #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
37 #
38 # Derived from:
39 # os.s
40 #
41 # This file contains:
42 # - example "Call-Out"s required by both the ISP and FPSP.
43 #
44 */
46 #include <machine/asm.h>
48 #include "assym.h"
50 /*
51 #
52 # make the copyright notice appear in the binary:
53 #
54 */
55 #include "copyright.S"
57 /*
58 #################################
59 # EXAMPLE CALL-OUTS #
60 # #
61 # _060_dmem_write() #
62 # _060_dmem_read() #
63 # _060_imem_read() #
64 # _060_dmem_read_byte() #
65 # _060_dmem_read_word() #
66 # _060_dmem_read_long() #
67 # _060_imem_read_word() #
68 # _060_imem_read_long() #
69 # _060_dmem_write_byte() #
70 # _060_dmem_write_word() #
71 # _060_dmem_write_long() #
72 # #
73 # _060_real_trace() #
74 # _060_real_access() #
75 #################################
76 */
78 /*
79 #
80 # Each IO routine checks to see if the memory write/read is to/from user
81 # or supervisor application space. The examples below use simple "move"
82 # instructions for supervisor mode applications and call _copyin()/_copyout()
83 # for user mode applications.
84 # When installing the 060SP, the _copyin()/_copyout() equivalents for a
85 # given operating system should be substituted.
86 #
87 # The addresses within the 060SP are guaranteed to be on the stack.
88 # The result is that Unix processes are allowed to sleep as a consequence
89 # of a page fault during a _copyout.
90 #
91 */
93 /*
94 #
95 # _060_dmem_write():
96 #
97 # Writes to data memory while in supervisor mode.
98 #
99 # INPUTS:
100 # a0 - supervisor source address
101 # a1 - user destination address
102 # d0 - number of bytes to write
103 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
104 # OUTPUTS:
105 # d1 - 0 = success, !0 = failure
106 #
107 */
108 ASENTRY_NOPROFILE(_060_dmem_write)
109 btst #0x5,%a6@(0x4) |# check for supervisor state
110 beqs user_write
111 super_write:
112 moveb %a0@+,%a1@+ |# copy 1 byte
113 subql #0x1,%d0 |# decr byte counter
114 bnes super_write |# quit if ctr = 0
115 clrl %d1 |# return success
116 rts
117 user_write:
118 movel %d0,%sp@- |# pass: counter
119 movel %a1,%sp@- |# pass: user dst
120 movel %a0,%sp@- |# pass: supervisor src
121 bsrl _C_LABEL(copyout) |# write byte to user mem
122 movel %d0,%d1 |# return success
123 addl #0xc,%sp |# clear 3 lw params
124 rts
126 /*
127 #
128 # _060_imem_read(), _060_dmem_read():
129 #
130 # Reads from data/instruction memory while in supervisor mode.
131 #
132 # INPUTS:
133 # a0 - user source address
134 # a1 - supervisor destination address
135 # d0 - number of bytes to read
136 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
137 # OUTPUTS:
138 # d1 - 0 = success, !0 = failure
139 #
140 */
141 ASENTRY_NOPROFILE(_060_imem_read)
142 ASENTRY_NOPROFILE(_060_dmem_read)
143 btst #0x5,%a6@(0x4) |# check for supervisor state
144 beqs user_read
145 super_read:
146 moveb %a0@+,%a1@+ |# copy 1 byte
147 subql #0x1,%d0 |# decr byte counter
148 bnes super_read |# quit if ctr = 0
149 clrl %d1 |# return success
150 rts
151 user_read:
152 movel %d0,%sp@- |# pass: counter
153 movel %a1,%sp@- |# pass: super dst
154 movel %a0,%sp@- |# pass: user src
155 bsrl _C_LABEL(copyin) |# read byte from user mem
156 movel %d0,%d1 |# return success
157 addl #0xc,%sp |# clear 3 lw params
158 rts
160 /*
161 #
162 # _060_dmem_read_byte():
163 #
164 # Read a data byte from user memory.
165 #
166 # INPUTS:
167 # a0 - user source address
168 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
169 # OUTPUTS:
170 # d0 - data byte in d0
171 # d1 - 0 = success, !0 = failure
172 #
173 */
174 ASENTRY_NOPROFILE(_060_dmem_read_byte)
175 clrl %d1 |# return success
176 clrl %d0 |# clear whole longword
177 btst #0x5,%a6@(0x4) |# check for supervisor state
178 bnes dmrbs |# supervisor
179 dmrbu:
180 movl _C_LABEL(curpcb),%a1 | fault handler
181 movl #Lferr,%a1@(PCB_ONFAULT)| set it
182 movsb %a0@,%d0
183 bra Lfdone
185 dmrbs:
186 moveb %a0@,%d0 |# fetch super byte
187 rts
189 /*
190 #
191 # _060_imem_read_word():
192 # Read an instruction word from user memory.
193 #
194 # _060_dmem_read_word():
195 # Read a data word from user memory.
196 #
197 # INPUTS:
198 # a0 - user source address
199 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
200 # OUTPUTS:
201 # d0 - data word in d0
202 # d1 - 0 = success, !0 = failure
203 #
204 */
205 ASENTRY_NOPROFILE(_060_imem_read_word)
206 ASENTRY_NOPROFILE(_060_dmem_read_word)
207 clrl %d1 |# return success
208 clrl %d0 |# clear whole longword
209 btst #0x5,%a6@(0x4) |# check for supervisor state
210 bnes dmrws |# supervisor
211 dmrwu:
212 movl _C_LABEL(curpcb),%a1 | fault handler
213 movl #Lferr,%a1@(PCB_ONFAULT)| set it
214 movsw %a0@,%d0
215 bra Lfdone
216 dmrws:
217 movew %a0@,%d0 |# fetch super word
218 rts
220 /*
221 #
222 # _060_imem_read_long():
223 # Read an instruction longword from user memory.
224 #
225 # _060_dmem_read_long():
226 # Read an data longword from user memory.
227 #
228 #
229 # INPUTS:
230 # a0 - user source address
231 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
232 # OUTPUTS:
233 # d0 - data longword in d0
234 # d1 - 0 = success, !0 = failure
235 #
236 */
237 ASENTRY_NOPROFILE(_060_imem_read_long)
238 ASENTRY_NOPROFILE(_060_dmem_read_long)
239 clrl %d1 |# return success
240 btst #0x5,%a6@(0x4) |# check for supervisor state
241 bnes dmrls |# supervisor
242 dmrlu:
243 movl _C_LABEL(curpcb),%a1 | fault handler
244 movl #Lferr,%a1@(PCB_ONFAULT)| set it
245 movsl %a0@,%d0
246 bra Lfdone
247 dmrls:
248 movel %a0@,%d0 |# fetch super longword
249 rts
251 /*
252 #
253 # _060_dmem_write_byte():
254 #
255 # Write a data byte to user memory.
256 #
257 # INPUTS:
258 # a0 - user destination address
259 # d0 - data byte in d0
260 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
261 # OUTPUTS:
262 # d1 - 0 = success, !0 = failure
263 #
264 */
265 ASENTRY_NOPROFILE(_060_dmem_write_byte)
266 clrl %d1 |# return success
267 btst #0x5,%a6@(0x4) |# check for supervisor state
268 bnes dmwbs |# supervisor
269 dmwbu:
270 movl _C_LABEL(curpcb),%a1 | fault handler
271 movl #Lferr,%a1@(PCB_ONFAULT)| set it
272 movsb %d0,%a0@
273 bra Lfdone
274 dmwbs:
275 moveb %d0,%a0@ |# store super byte
276 rts
278 /*
279 #
280 # _060_dmem_write_word():
281 #
282 # Write a data word to user memory.
283 #
284 # INPUTS:
285 # a0 - user destination address
286 # d0 - data word in d0
287 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
288 # OUTPUTS:
289 # d1 - 0 = success, !0 = failure
290 #
291 */
292 ASENTRY_NOPROFILE(_060_dmem_write_word)
293 clrl %d1 |# return success
294 btst #0x5,%a6@(0x4) |# check for supervisor state
295 bnes dmwws |# supervisor
296 dmwwu:
297 movl _C_LABEL(curpcb),%a1 | fault handler
298 movl #Lferr,%a1@(PCB_ONFAULT)| set it
299 movsw %d0,%a0@
300 bra Lfdone
301 dmwws:
302 movew %d0,%a0@ |# store super word
303 rts
305 /*
306 #
307 # _060_dmem_write_long():
308 #
309 # Write a data longword to user memory.
310 #
311 # INPUTS:
312 # a0 - user destination address
313 # d0 - data longword in d0
314 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
315 # OUTPUTS:
316 # d1 - 0 = success, !0 = failure
317 #
318 */
319 ASENTRY_NOPROFILE(_060_dmem_write_long)
320 clrl %d1 |# return success
321 btst #0x5,%a6@(0x4) |# check for supervisor state
322 bnes dmwls |# supervisor
323 dmwlu:
324 movl _C_LABEL(curpcb),%a1 | fault handler
325 movl #Lferr,%a1@(PCB_ONFAULT)| set it
326 movsl %d0,%a0@
327 bra Lfdone
328 dmwls:
329 movel %d0,%a0@ |# store super longword
330 rts
332 |############################################################################
333 Lferr:
334 moveq #-1,%d1
335 Lfdone:
336 clrl %a1@(PCB_ONFAULT) | clear fault handler
337 rts
339 |############################################################################
341 /*
342 #
343 # _060_real_trace():
344 #
345 # This is the exit point for the 060FPSP when an instruction is being traced
346 # and there are no other higher priority exceptions pending for this instruction
347 # or they have already been processed.
348 #
349 # The sample code below simply executes an "rte".
350 #
351 */
352 ASENTRY_NOPROFILE(_060_real_trace)
353 jra _C_LABEL(trace)
355 /*
356 #
357 # _060_real_access():
358 #
359 # This is the exit point for the 060FPSP when an access error exception
360 # is encountered. The routine below should point to the operating system
361 # handler for access error exceptions. The exception stack frame is an
362 # 8-word access error frame.
363 #
364 # We jump directly to the 68060 buserr handler.
365 # If we had a sane ld, we could use use that entry point directly...
366 #
367 */
368 ASENTRY_NOPROFILE(_060_real_access)
369 jra _C_LABEL(buserr60)
371 #include "inetbsd.S"
372 #include "fnetbsd.S"