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1|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2|MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
3|M68000 Hi-Performance Microprocessor Division
4|M68060 Software Package
5|Production Release P1.00 -- October 10, 1994
6|
7|M68060 Software Package Copyright © 1993, 1994 Motorola Inc. All rights reserved.
8|
9|THE SOFTWARE is provided on an "AS IS" basis and without warranty.
10|To the maximum extent permitted by applicable law,
11|MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
12|INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
13|and any warranty against infringement with regard to the SOFTWARE
14|(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
15|
16|To the maximum extent permitted by applicable law,
17|IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
18|(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
19|BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
20|ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
21|Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
22|
23|You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
24|so long as this entire notice is retained without alteration in any modified and/or
25|redistributed versions, and that such modified versions are clearly identified as such.
26|No licenses are granted by implication, estoppel or otherwise under any patents
27|or trademarks of Motorola, Inc.
28|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29| iskeleton.s
30|
31| This file contains:
32| (1) example "Call-out"s
33| (2) example package entry code
34| (3) example "Call-out" table
35|
36
37#include <linux/linkage.h>
38#include <asm/entry.h>
39#include <asm/offsets.h>
40
41
42|################################
43| (1) EXAMPLE CALL-OUTS #
44| #
45| _060_isp_done() #
46| _060_real_chk() #
47| _060_real_divbyzero() #
48| #
49| _060_real_cas() #
50| _060_real_cas2() #
51| _060_real_lock_page() #
52| _060_real_unlock_page() #
53|################################
54
55|
56| _060_isp_done():
57|
58| This is and example main exit point for the Unimplemented Integer
59| Instruction exception handler. For a normal exit, the
60| _isp_unimp() branches to here so that the operating system
61| can do any clean-up desired. The stack frame is the
62| Unimplemented Integer Instruction stack frame with
63| the PC pointing to the instruction following the instruction
64| just emulated.
65| To simply continue execution at the next instruction, just
66| do an "rte".
67|
68| Linux/68k: If returning to user space, check for needed reselections.
69
70 .global _060_isp_done
71_060_isp_done:
72 btst #0x5,%sp@ | supervisor bit set in saved SR?
73 beq .Lnotkern
74 rte
75.Lnotkern:
76 SAVE_ALL_INT
77 GET_CURRENT(%d0)
78 tstb %curptr@(TASK_NEEDRESCHED)
79 jne ret_from_exception | deliver signals,
80 | reschedule etc..
81 RESTORE_ALL
82
83|
84| _060_real_chk():
85|
86| This is an alternate exit point for the Unimplemented Integer
87| Instruction exception handler. If the instruction was a "chk2"
88| and the operand was out of bounds, then _isp_unimp() creates
89| a CHK exception stack frame from the Unimplemented Integer Instrcution
90| stack frame and branches to this routine.
91|
92| Linux/68k: commented out test for tracing
93
94 .global _060_real_chk
95_060_real_chk:
96| tst.b (%sp) | is tracing enabled?
97| bpls real_chk_end | no
98
99|
100| CHK FRAME TRACE FRAME
101| ***************** *****************
102| * Current PC * * Current PC *
103| ***************** *****************
104| * 0x2 * 0x018 * * 0x2 * 0x024 *
105| ***************** *****************
106| * Next * * Next *
107| * PC * * PC *
108| ***************** *****************
109| * SR * * SR *
110| ***************** *****************
111|
112| move.b #0x24,0x7(%sp) | set trace vecno
113| bral _060_real_trace
114
115real_chk_end:
116 bral trap | jump to trap handler
117
118|
119| _060_real_divbyzero:
120|
121| This is an alternate exit point for the Unimplemented Integer
122| Instruction exception handler isp_unimp(). If the instruction is a 64-bit
123| integer divide where the source operand is a zero, then the _isp_unimp()
124| creates a Divide-by-zero exception stack frame from the Unimplemented
125| Integer Instruction stack frame and branches to this routine.
126|
127| Remember that a trace exception may be pending. The code below performs
128| no action associated with the "chk" exception. If tracing is enabled,
129| then it create a Trace exception stack frame from the "chk" exception
130| stack frame and branches to the _real_trace() entry point.
131|
132| Linux/68k: commented out test for tracing
133
134 .global _060_real_divbyzero
135_060_real_divbyzero:
136| tst.b (%sp) | is tracing enabled?
137| bpls real_divbyzero_end | no
138
139|
140| DIVBYZERO FRAME TRACE FRAME
141| ***************** *****************
142| * Current PC * * Current PC *
143| ***************** *****************
144| * 0x2 * 0x014 * * 0x2 * 0x024 *
145| ***************** *****************
146| * Next * * Next *
147| * PC * * PC *
148| ***************** *****************
149| * SR * * SR *
150| ***************** *****************
151|
152| move.b #0x24,0x7(%sp) | set trace vecno
153| bral _060_real_trace
154
155real_divbyzero_end:
156 bral trap | jump to trap handler
157
158|##########################
159
160|
161| _060_real_cas():
162|
163| Entry point for the selected cas emulation code implementation.
164| If the implementation provided by the 68060ISP is sufficient,
165| then this routine simply re-enters the package through _isp_cas.
166|
167 .global _060_real_cas
168_060_real_cas:
169 bral _I_CALL_TOP+0x80+0x08
170
171|
172| _060_real_cas2():
173|
174| Entry point for the selected cas2 emulation code implementation.
175| If the implementation provided by the 68060ISP is sufficient,
176| then this routine simply re-enters the package through _isp_cas2.
177|
178 .global _060_real_cas2
179_060_real_cas2:
180 bral _I_CALL_TOP+0x80+0x10
181
182|
183| _060_lock_page():
184|
185| Entry point for the operating system`s routine to "lock" a page
186| from being paged out. This routine is needed by the cas/cas2
187| algorithms so that no page faults occur within the "core" code
188| region. Note: the routine must lock two pages if the operand
189| spans two pages.
190| NOTE: THE ROUTINE SHOULD RETURN AN FSLW VALUE IN D0 ON FAILURE
191| SO THAT THE 060SP CAN CREATE A PROPER ACCESS ERROR FRAME.
192| Arguments:
193| a0 = operand address
194| d0 = `xxxxxxff -> supervisor; `xxxxxx00 -> user
195| d1 = `xxxxxxff -> longword; `xxxxxx00 -> word
196| Expected outputs:
197| d0 = 0 -> success; non-zero -> failure
198|
199| Linux/m68k: Make sure the page is properly paged in, so we use
200| plpaw and handle any exception here. The kernel must not be
201| preempted until _060_unlock_page(), so that the page stays mapped.
202|
203 .global _060_real_lock_page
204_060_real_lock_page:
205 move.l %d2,-(%sp)
206 | load sfc/dfc
207 tst.b %d0
208 jne 1f
209 moveq #1,%d0
210 jra 2f
2111: moveq #5,%d0
2122: movec.l %dfc,%d2
213 movec.l %d0,%dfc
214 movec.l %d0,%sfc
215
216 clr.l %d0
217 | prefetch address
218 .chip 68060
219 move.l %a0,%a1
2201: plpaw (%a1)
221 addq.w #1,%a0
222 tst.b %d1
223 jeq 2f
224 addq.w #2,%a0
2252: plpaw (%a0)
2263: .chip 68k
227
228 | restore sfc/dfc
229 movec.l %d2,%dfc
230 movec.l %d2,%sfc
231 move.l (%sp)+,%d2
232 rts
233
234.section __ex_table,"a"
235 .align 4
236 .long 1b,11f
237 .long 2b,21f
238.previous
239.section .fixup,"ax"
240 .even
24111: move.l #0x020003c0,%d0
242 or.l %d2,%d0
243 swap %d0
244 jra 3b
24521: move.l #0x02000bc0,%d0
246 or.l %d2,%d0
247 swap %d0
248 jra 3b
249.previous
250
251|
252| _060_unlock_page():
253|
254| Entry point for the operating system`s routine to "unlock" a
255| page that has been "locked" previously with _real_lock_page.
256| Note: the routine must unlock two pages if the operand spans
257| two pages.
258| Arguments:
259| a0 = operand address
260| d0 = `xxxxxxff -> supervisor; `xxxxxx00 -> user
261| d1 = `xxxxxxff -> longword; `xxxxxx00 -> word
262|
263| Linux/m68k: perhaps reenable preemption here...
264
265 .global _060_real_unlock_page
266_060_real_unlock_page:
267 clr.l %d0
268 rts
269
270|###########################################################################
271
272|#################################
273| (2) EXAMPLE PACKAGE ENTRY CODE #
274|#################################
275
276 .global _060_isp_unimp
277_060_isp_unimp:
278 bral _I_CALL_TOP+0x80+0x00
279
280 .global _060_isp_cas
281_060_isp_cas:
282 bral _I_CALL_TOP+0x80+0x08
283
284 .global _060_isp_cas2
285_060_isp_cas2:
286 bral _I_CALL_TOP+0x80+0x10
287
288 .global _060_isp_cas_finish
289_060_isp_cas_finish:
290 bra.l _I_CALL_TOP+0x80+0x18
291
292 .global _060_isp_cas2_finish
293_060_isp_cas2_finish:
294 bral _I_CALL_TOP+0x80+0x20
295
296 .global _060_isp_cas_inrange
297_060_isp_cas_inrange:
298 bral _I_CALL_TOP+0x80+0x28
299
300 .global _060_isp_cas_terminate
301_060_isp_cas_terminate:
302 bral _I_CALL_TOP+0x80+0x30
303
304 .global _060_isp_cas_restart
305_060_isp_cas_restart:
306 bral _I_CALL_TOP+0x80+0x38
307
308|###########################################################################
309
310|###############################
311| (3) EXAMPLE CALL-OUT SECTION #
312|###############################
313
314| The size of this section MUST be 128 bytes!!!
315
316_I_CALL_TOP:
317 .long _060_real_chk - _I_CALL_TOP
318 .long _060_real_divbyzero - _I_CALL_TOP
319 .long _060_real_trace - _I_CALL_TOP
320 .long _060_real_access - _I_CALL_TOP
321 .long _060_isp_done - _I_CALL_TOP
322
323 .long _060_real_cas - _I_CALL_TOP
324 .long _060_real_cas2 - _I_CALL_TOP
325 .long _060_real_lock_page - _I_CALL_TOP
326 .long _060_real_unlock_page - _I_CALL_TOP
327
328 .long 0x00000000, 0x00000000, 0x00000000, 0x00000000
329 .long 0x00000000, 0x00000000, 0x00000000
330
331 .long _060_imem_read - _I_CALL_TOP
332 .long _060_dmem_read - _I_CALL_TOP
333 .long _060_dmem_write - _I_CALL_TOP
334 .long _060_imem_read_word - _I_CALL_TOP
335 .long _060_imem_read_long - _I_CALL_TOP
336 .long _060_dmem_read_byte - _I_CALL_TOP
337 .long _060_dmem_read_word - _I_CALL_TOP
338 .long _060_dmem_read_long - _I_CALL_TOP
339 .long _060_dmem_write_byte - _I_CALL_TOP
340 .long _060_dmem_write_word - _I_CALL_TOP
341 .long _060_dmem_write_long - _I_CALL_TOP
342
343 .long 0x00000000
344 .long 0x00000000, 0x00000000, 0x00000000, 0x00000000
345
346|###########################################################################
347
348| 060 INTEGER KERNEL PACKAGE MUST GO HERE!!!
349#include "isp.sa"
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