netbsd060sp.S revision 1.5
1 # 2 # $NetBSD: netbsd060sp.S,v 1.5 1999/01/30 21:54:49 is Exp $ 3 # 4 #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 5 # MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP 6 # M68000 Hi-Performance Microprocessor Division 7 # M68060 Software Package Production Release 8 # 9 # M68060 Software Package Copyright (C) 1993, 1994, 1995, 1996 Motorola Inc. 10 # All rights reserved. 11 # 12 # THE SOFTWARE is provided on an "AS IS" basis and without warranty. 13 # To the maximum extent permitted by applicable law, 14 # MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, 15 # INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS 16 # FOR A PARTICULAR PURPOSE and any warranty against infringement with 17 # regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF) 18 # and any accompanying written materials. 19 # 20 # To the maximum extent permitted by applicable law, 21 # IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER 22 # (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS, 23 # BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS) 24 # ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE. 25 # 26 # Motorola assumes no responsibility for the maintenance and support 27 # of the SOFTWARE. 28 # 29 # You are hereby granted a copyright license to use, modify, and distribute the 30 # SOFTWARE so long as this entire notice is retained without alteration 31 # in any modified and/or redistributed versions, and that such modified 32 # versions are clearly identified as such. 33 # No licenses are granted by implication, estoppel or otherwise under any 34 # patents or trademarks of Motorola, Inc. 35 #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 36 # 37 # Derived from: 38 # os.s 39 # 40 # This file contains: 41 # - example "Call-Out"s required by both the ISP and FPSP. 42 # 43 44 # 45 # make the copyright notice appear in the binary: 46 # 47 .include "copyright.S" 48 49 ################################# 50 # EXAMPLE CALL-OUTS # 51 # # 52 # _060_dmem_write() # 53 # _060_dmem_read() # 54 # _060_imem_read() # 55 # _060_dmem_read_byte() # 56 # _060_dmem_read_word() # 57 # _060_dmem_read_long() # 58 # _060_imem_read_word() # 59 # _060_imem_read_long() # 60 # _060_dmem_write_byte() # 61 # _060_dmem_write_word() # 62 # _060_dmem_write_long() # 63 # # 64 # _060_real_trace() # 65 # _060_real_access() # 66 ################################# 67 68 # 69 # Each IO routine checks to see if the memory write/read is to/from user 70 # or supervisor application space. The examples below use simple "move" 71 # instructions for supervisor mode applications and call _copyin()/_copyout() 72 # for user mode applications. 73 # When installing the 060SP, the _copyin()/_copyout() equivalents for a 74 # given operating system should be substituted. 75 # 76 # The addresses within the 060SP are guaranteed to be on the stack. 77 # The result is that Unix processes are allowed to sleep as a consequence 78 # of a page fault during a _copyout. 79 # 80 81 # 82 # _060_dmem_write(): 83 # 84 # Writes to data memory while in supervisor mode. 85 # 86 # INPUTS: 87 # a0 - supervisor source address 88 # a1 - user destination address 89 # d0 - number of bytes to write 90 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode 91 # OUTPUTS: 92 # d1 - 0 = success, !0 = failure 93 # 94 .global _060_dmem_write 95 _060_dmem_write: 96 btst #0x5,a6@(0x4) |# check for supervisor state 97 beqs user_write 98 super_write: 99 moveb a0@+,a1@+ |# copy 1 byte 100 subql #0x1,d0 |# decr byte counter 101 bnes super_write |# quit if ctr = 0 102 clrl d1 |# return success 103 rts 104 user_write: 105 movel d0,sp@- |# pass: counter 106 movel a1,sp@- |# pass: user dst 107 movel a0,sp@- |# pass: supervisor src 108 bsrl _copyout |# write byte to user mem 109 movel d0,d1 |# return success 110 addl #0xc,sp |# clear 3 lw params 111 rts 112 113 # 114 # _060_imem_read(), _060_dmem_read(): 115 # 116 # Reads from data/instruction memory while in supervisor mode. 117 # 118 # INPUTS: 119 # a0 - user source address 120 # a1 - supervisor destination address 121 # d0 - number of bytes to read 122 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode 123 # OUTPUTS: 124 # d1 - 0 = success, !0 = failure 125 # 126 .global _060_imem_read 127 .global _060_dmem_read 128 _060_imem_read: 129 _060_dmem_read: 130 btst #0x5,a6@(0x4) |# check for supervisor state 131 beqs user_read 132 super_read: 133 moveb a0@+,a1@+ |# copy 1 byte 134 subql #0x1,d0 |# decr byte counter 135 bnes super_read |# quit if ctr = 0 136 clrl d1 |# return success 137 rts 138 user_read: 139 movel d0,sp@- |# pass: counter 140 movel a1,sp@- |# pass: super dst 141 movel a0,sp@- |# pass: user src 142 bsrl _copyin |# read byte from user mem 143 movel d0,d1 |# return success 144 addl #0xc,sp |# clear 3 lw params 145 rts 146 147 # 148 # _060_dmem_read_byte(): 149 # 150 # Read a data byte from user memory. 151 # 152 # INPUTS: 153 # a0 - user source address 154 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode 155 # OUTPUTS: 156 # d0 - data byte in d0 157 # d1 - 0 = success, !0 = failure 158 # 159 .global _060_dmem_read_byte 160 _060_dmem_read_byte: 161 clrl d1 |# return success 162 clrl d0 |# clear whole longword 163 btst #0x5,a6@(0x4) |# check for supervisor state 164 bnes dmrbs |# supervisor 165 dmrbu: 166 movl _curpcb,a1 | fault handler 167 movl #Lferr,a1@(64) | set it 168 movsb a0@,d0 169 bra Lfdone 170 171 dmrbs: 172 moveb a0@,d0 |# fetch super byte 173 rts 174 175 # 176 # _060_imem_read_word(): 177 # Read an instruction word from user memory. 178 # 179 # _060_dmem_read_word(): 180 # Read a data word from user memory. 181 # 182 # INPUTS: 183 # a0 - user source address 184 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode 185 # OUTPUTS: 186 # d0 - data word in d0 187 # d1 - 0 = success, !0 = failure 188 # 189 .global _060_imem_read_word 190 .global _060_dmem_read_word 191 192 _060_imem_read_word: 193 _060_dmem_read_word: 194 clrl d1 |# return success 195 clrl d0 |# clear whole longword 196 btst #0x5,a6@(0x4) |# check for supervisor state 197 bnes dmrws |# supervisor 198 dmrwu: 199 movl _curpcb,a1 | fault handler 200 movl #Lferr,a1@(64) | set it 201 movsw a0@,d0 202 bra Lfdone 203 dmrws: 204 movew a0@,d0 |# fetch super word 205 rts 206 207 # 208 # _060_imem_read_long(): 209 # Read an instruction longword from user memory. 210 # 211 # _060_dmem_read_long(): 212 # Read an data longword from user memory. 213 # 214 215 # 216 # INPUTS: 217 # a0 - user source address 218 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode 219 # OUTPUTS: 220 # d0 - data longword in d0 221 # d1 - 0 = success, !0 = failure 222 # 223 224 .global _060_dmem_read_long 225 .global _060_imem_read_long 226 227 _060_imem_read_long: 228 _060_dmem_read_long: 229 clrl d1 |# return success 230 btst #0x5,a6@(0x4) |# check for supervisor state 231 bnes dmrls |# supervisor 232 dmrlu: 233 movl _curpcb,a1 | fault handler 234 movl #Lferr,a1@(64) | set it 235 movsl a0@,d0 236 bra Lfdone 237 dmrls: 238 movel a0@,d0 |# fetch super longword 239 rts 240 241 # 242 # _060_dmem_write_byte(): 243 # 244 # Write a data byte to user memory. 245 # 246 # INPUTS: 247 # a0 - user destination address 248 # d0 - data byte in d0 249 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode 250 # OUTPUTS: 251 # d1 - 0 = success, !0 = failure 252 # 253 .global _060_dmem_write_byte 254 _060_dmem_write_byte: 255 clrl d1 |# return success 256 btst #0x5,a6@(0x4) |# check for supervisor state 257 bnes dmwbs |# supervisor 258 dmwbu: 259 movl _curpcb,a1 | fault handler 260 movl #Lferr,a1@(64) | set it 261 movsb d0,a0@ 262 bra Lfdone 263 dmwbs: 264 moveb d0,a0@ |# store super byte 265 rts 266 267 # 268 # _060_dmem_write_word(): 269 # 270 # Write a data word to user memory. 271 # 272 # INPUTS: 273 # a0 - user destination address 274 # d0 - data word in d0 275 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode 276 # OUTPUTS: 277 # d1 - 0 = success, !0 = failure 278 # 279 .global _060_dmem_write_word 280 _060_dmem_write_word: 281 clrl d1 |# return success 282 btst #0x5,a6@(0x4) |# check for supervisor state 283 bnes dmwws |# supervisor 284 dmwwu: 285 movl _curpcb,a1 | fault handler 286 movl #Lferr,a1@(64) | set it 287 movsw d0,a0@ 288 bra Lfdone 289 dmwws: 290 movew d0,a0@ |# store super word 291 rts 292 293 # 294 # _060_dmem_write_long(): 295 # 296 # Write a data longword to user memory. 297 # 298 # INPUTS: 299 # a0 - user destination address 300 # d0 - data longword in d0 301 # a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode 302 # OUTPUTS: 303 # d1 - 0 = success, !0 = failure 304 # 305 .global _060_dmem_write_long 306 _060_dmem_write_long: 307 clrl d1 |# return success 308 btst #0x5,a6@(0x4) |# check for supervisor state 309 bnes dmwls |# supervisor 310 dmwlu: 311 movl _curpcb,a1 | fault handler 312 movl #Lferr,a1@(64) | set it 313 movsl d0,a0@ 314 bra Lfdone 315 dmwls: 316 movel d0,a0@ |# store super longword 317 rts 318 319 ############################################################################ 320 Lferr: 321 moveq #-1,d1 322 Lfdone: 323 clrl a1@(64) | clear fault handler 324 rts 325 326 ############################################################################ 327 328 # 329 # _060_real_trace(): 330 # 331 # This is the exit point for the 060FPSP when an instruction is being traced 332 # and there are no other higher priority exceptions pending for this instruction 333 # or they have already been processed. 334 # 335 # The sample code below simply executes an "rte". 336 # 337 .global _060_real_trace,_trace 338 _060_real_trace: 339 jra _trace 340 341 # 342 # _060_real_access(): 343 # 344 # This is the exit point for the 060FPSP when an access error exception 345 # is encountered. The routine below should point to the operating system 346 # handler for access error exceptions. The exception stack frame is an 347 # 8-word access error frame. 348 # 349 # We jump directly to the 68060 buserr handler. 350 # If we had a sane ld, we could use use that entry point directly... 351 # 352 .globl _060_real_access,_buserr60 353 _060_real_access: 354 jra _buserr60 355 356 .include "inetbsd.S" 357 .include "fnetbsd.S" 358
Indexes created Wed Oct 15 16:09:53 GMT 2025