1 /* $NetBSD: locore.S,v 1.15 2022/03/16 20:31:01 andvar Exp $ */ 2 3 /* 4 * Copyright (c) 1992 OMRON Corporation. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * OMRON Corporation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)locore.s 8.1 (Berkeley) 6/10/93 38 */ 39 /* 40 * Copyright (c) 1990, 1993 41 * The Regents of the University of California. All rights reserved. 42 * 43 * This code is derived from software contributed to Berkeley by 44 * OMRON Corporation. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)locore.s 8.1 (Berkeley) 6/10/93 71 */ 72 73 /* For _C_LABEL() and friends. */ 74 #include <m68k/asm.h> 75 76 #define T_BUSERR 0 77 #define T_ADDRERR 1 78 #define T_ILLINST 2 79 #define T_ZERODIV 3 80 #define T_CHKINST 4 81 #define T_TRAPVINST 5 82 #define T_PRIVINST 6 83 #define T_MMUFLT 8 84 #define T_FMTERR 10 85 #define T_FPERR 11 86 #define T_COPERR 12 87 88 #define PSL_LOWIPL 0x2000 /* PSL_S | PSL_IPL0 */ 89 #define PSL_HIGHIPL 0x2700 /* PSL_S | PSL_IPL7 */ 90 91 #define SPL1 0x2100 /* PSL_S | PSL_IPL1 */ 92 #define SPL2 0x2200 /* PSL_S | PSL_IPL2 */ 93 #define SPL3 0x2300 /* PSL_S | PSL_IPL3 */ 94 #define SPL4 0x2400 /* PSL_S | PSL_IPL4 */ 95 #define SPL5 0x2500 /* PSL_S | PSL_IPL5 */ 96 #define SPL6 0x2600 /* PSL_S | PSL_IPL6 */ 97 98 #define CLOCK_REG 0x63000000 99 #define CLK_CLR 1 100 101 #define ILLGINST 16 102 #define NMIVEC 124 103 #define EVTRAPF 188 104 105 .text 106 107 ASENTRY_NOPROFILE(start) 108 ASGLOBAL(Reset) 109 jmp _C_LABEL(start1) /* 0: NOT USED (reset PC) */ 110 .word 0 /* 1: NOT USED (reset PC) */ 111 VECTOR(buserr) /* 2: bus error */ 112 VECTOR(addrerr) /* 3: address error */ 113 VECTOR(illinst) /* 4: illegal instruction */ 114 VECTOR(zerodiv) /* 5: zero divide */ 115 VECTOR(chkinst) /* 6: CHK instruction */ 116 VECTOR(trapvinst) /* 7: TRAPV instruction */ 117 VECTOR(privinst) /* 8: privilege violation */ 118 VECTOR(badtrap) /* 9: trace */ 119 VECTOR(illinst) /* 10: line 1010 emulator */ 120 VECTOR(illinst) /* 11: line 1111 emulator */ 121 VECTOR(badtrap) /* 12: unassigned, reserved */ 122 VECTOR(coperr) /* 13: coprocessor protocol violation */ 123 VECTOR(fmterr) /* 14: format error */ 124 VECTOR(badtrap) /* 15: uninitialized interrupt vector */ 125 VECTOR(badtrap) /* 16: unassigned, reserved */ 126 VECTOR(badtrap) /* 17: unassigned, reserved */ 127 VECTOR(badtrap) /* 18: unassigned, reserved */ 128 VECTOR(badtrap) /* 19: unassigned, reserved */ 129 VECTOR(badtrap) /* 20: unassigned, reserved */ 130 VECTOR(badtrap) /* 21: unassigned, reserved */ 131 VECTOR(badtrap) /* 22: unassigned, reserved */ 132 VECTOR(badtrap) /* 23: unassigned, reserved */ 133 VECTOR(badtrap) /* 24: unassigned, reserved */ 134 VECTOR(badtrap) /* 25: unassigned, reserved */ 135 VECTOR(lev2intr) /* 26: level 2 interrupt autovector */ 136 VECTOR(lev3intr) /* 27: level 3 interrupt autovector */ 137 VECTOR(badtrap) /* 28: level 4 interrupt autovector */ 138 VECTOR(lev5intr) /* 29: level 5 interrupt autovector */ 139 VECTOR(lev6intr) /* 30: level 6 interrupt autovector */ 140 VECTOR(exit) /* 31: level 7 interrupt autovector */ 141 VECTOR(illinst) /* 32: syscalls */ 142 VECTOR(illinst) /* 33: sigreturn syscall or breakpoint */ 143 VECTOR(illinst) /* 34: breakpoint or sigreturn syscall */ 144 VECTOR(illinst) /* 35: TRAP instruction vector */ 145 VECTOR(illinst) /* 36: TRAP instruction vector */ 146 VECTOR(illinst) /* 37: TRAP instruction vector */ 147 VECTOR(illinst) /* 38: TRAP instruction vector */ 148 VECTOR(illinst) /* 39: TRAP instruction vector */ 149 VECTOR(illinst) /* 40: TRAP instruction vector */ 150 VECTOR(illinst) /* 41: TRAP instruction vector */ 151 VECTOR(illinst) /* 42: TRAP instruction vector */ 152 VECTOR(illinst) /* 43: TRAP instruction vector */ 153 VECTOR(illinst) /* 44: TRAP instruction vector */ 154 VECTOR(illinst) /* 45: TRAP instruction vector */ 155 VECTOR(illinst) /* 45: TRAP instruction vector */ 156 VECTOR(illinst) /* 47: TRAP instruction vector */ 157 VECTOR(fptrap) /* 48: FPCP branch/set on unordered cond */ 158 VECTOR(fptrap) /* 49: FPCP inexact result */ 159 VECTOR(fptrap) /* 50: FPCP divide by zero */ 160 VECTOR(fptrap) /* 51: FPCP underflow */ 161 VECTOR(fptrap) /* 52: FPCP operand error */ 162 VECTOR(fptrap) /* 53: FPCP overflow */ 163 VECTOR(fptrap) /* 54: FPCP signalling NAN */ 164 165 VECTOR(badtrap) /* 55: unassigned, reserved */ 166 VECTOR(badtrap) /* 56: unassigned, reserved */ 167 VECTOR(badtrap) /* 57: unassigned, reserved */ 168 VECTOR(badtrap) /* 58: unassigned, reserved */ 169 VECTOR(badtrap) /* 59: unassigned, reserved */ 170 VECTOR(badtrap) /* 60: unassigned, reserved */ 171 VECTOR(badtrap) /* 61: unassigned, reserved */ 172 VECTOR(badtrap) /* 62: unassigned, reserved */ 173 VECTOR(badtrap) /* 63: unassigned, reserved */ 174 #define BADTRAP16 \ 175 VECTOR(badtrap) ; VECTOR(badtrap) ; \ 176 VECTOR(badtrap) ; VECTOR(badtrap) ; \ 177 VECTOR(badtrap) ; VECTOR(badtrap) ; \ 178 VECTOR(badtrap) ; VECTOR(badtrap) ; \ 179 VECTOR(badtrap) ; VECTOR(badtrap) ; \ 180 VECTOR(badtrap) ; VECTOR(badtrap) ; \ 181 VECTOR(badtrap) ; VECTOR(badtrap) ; \ 182 VECTOR(badtrap) ; VECTOR(badtrap) 183 184 BADTRAP16 /* 64-255: user interrupt vectors */ 185 BADTRAP16 /* 64-255: user interrupt vectors */ 186 BADTRAP16 /* 64-255: user interrupt vectors */ 187 BADTRAP16 /* 64-255: user interrupt vectors */ 188 BADTRAP16 /* 64-255: user interrupt vectors */ 189 BADTRAP16 /* 64-255: user interrupt vectors */ 190 BADTRAP16 /* 64-255: user interrupt vectors */ 191 BADTRAP16 /* 64-255: user interrupt vectors */ 192 BADTRAP16 /* 64-255: user interrupt vectors */ 193 BADTRAP16 /* 64-255: user interrupt vectors */ 194 BADTRAP16 /* 64-255: user interrupt vectors */ 195 BADTRAP16 /* 64-255: user interrupt vectors */ 196 197 198 STACK = 0x800000 199 DIPSW = 0x49000000 200 201 ASENTRY_NOPROFILE(start1) 202 movw #PSL_HIGHIPL,%sr | no interrupts 203 movl #STACK,%sp | set SP 204 205 /* clear BSS area */ 206 movl #_C_LABEL(edata),%a2 | start of BSS 207 movl #_C_LABEL(end),%a3 | end 208 Lbssclr: 209 clrb %a2@+ | clear BSS 210 cmpl %a2,%a3 | done? 211 bne Lbssclr | no, keep going 212 213 /* save address to goto ROM monitor */ 214 movec %vbr,%a0 | save ROM vbr 215 movl %a0,_ASM_LABEL(romvbr) 216 movl #_ASM_LABEL(Reset),%a0 | BP vbr to %a0 217 /* copy ROM vectors */ 218 movl %a0@(ILLGINST),_ASM_LABEL(Reset) + ILLGINST 219 movl %a0@(EVTRAPF),_ASM_LABEL(Reset) + EVTRAPF 220 movec %a0,%vbr 221 222 movw DIPSW,%d0 223 clrl %d1 224 movw %d0,%d1 225 lsrl #8,%d1 226 movl %d1,_C_LABEL(dipsw1) 227 movb %d0,%d1 228 movl %d1,_C_LABEL(dipsw2) 229 230 /* determine our CPU */ 231 232 /* XXX should be generated via assym.h */ 233 CACHE_OFF = 0x0808 234 DC_FREEZE = 0x0200 235 CPU_68030 = 1 236 CPU_68040 = 2 237 238 movl #CACHE_OFF,%d0 239 movc %d0,%cacr | clear and disable on-chip cache(s) 240 movl #DC_FREEZE,%d0 | data freeze bit 241 movc %d0,%cacr | only exists on 68030 242 movc %cacr,%d0 | read it back 243 tstl %d0 | zero? 244 jeq Lnot68030 | yes, we have 68040 245 movl #CPU_68030,%d0 246 jra Lstart0 247 Lnot68030: 248 movl #CPU_68040,%d0 249 Lstart0: 250 movl %d0,_C_LABEL(cputype) 251 252 /* final setup for C code */ 253 movw #PSL_LOWIPL,%sr | enable interrupts 254 jsr _C_LABEL(main) | lets go 255 jsr start 256 257 /* 258 * exit to ROM monitor 259 */ 260 ENTRY_NOPROFILE(exit) 261 GLOBAL(_rtt) 262 movw #PSL_HIGHIPL,%sr | no interrupts 263 movl _ASM_LABEL(romvbr),%a0 264 movec %a0,%vbr 265 movl %a0@(NMIVEC),%a1 266 jmp %a1@ 267 268 /* 269 * Trap/interrupt vector routines 270 */ 271 272 ENTRY_NOPROFILE(buserr) 273 tstl _C_LABEL(nofault) | device probe? 274 jeq _C_LABEL(addrerr) | no, handle as usual 275 movl _C_LABEL(nofault),%sp@- | yes, 276 jbsr _C_LABEL(longjmp) | longjmp(nofault) 277 ENTRY_NOPROFILE(addrerr) 278 clrw %sp@- | pad SR to longword 279 moveml #0xFFFF,%sp@- | save user registers 280 movl %usp,%a0 | save the user SP 281 movl %a0,%sp@(60) | in the savearea 282 lea %sp@(64),%a1 | grab base of HW berr frame 283 movw %a1@(12),%d0 | grab SSW for fault processing 284 btst #12,%d0 | RB set? 285 jeq LbeX0 | no, test RC 286 bset #14,%d0 | yes, must set FB 287 movw %d0,%a1@(12) | for hardware too 288 LbeX0: 289 btst #13,%d0 | RC set? 290 jeq LbeX1 | no, skip 291 bset #15,%d0 | yes, must set FC 292 movw %d0,%a1@(12) | for hardware too 293 LbeX1: 294 btst #8,%d0 | data fault? 295 jeq Lbe0 | no, check for hard cases 296 movl %a1@(18),%d1 | fault address is as given in frame 297 jra Lbe10 | thats it 298 Lbe0: 299 btst #4,%a1@(8) | long (type B) stack frame? 300 jne Lbe4 | yes, go handle 301 movl %a1@(4),%d1 | no, can use save PC 302 btst #14,%d0 | FB set? 303 jeq Lbe3 | no, try FC 304 addql #4,%d1 | yes, adjust address 305 jra Lbe10 | done 306 Lbe3: 307 btst #15,%d0 | FC set? 308 jeq Lbe10 | no, done 309 addql #2,%d1 | yes, adjust address 310 jra Lbe10 | done 311 Lbe4: 312 movl %a1@(38),%d1 | long format, use stage B address 313 btst #15,%d0 | FC set? 314 jeq Lbe10 | no, all done 315 subql #2,%d1 | yes, adjust address 316 Lbe10: 317 movl %d1,%sp@- | push fault VA 318 movw %d0,%sp@- | and SSW 319 clrw %sp@- | padded to longword 320 movw %a1@(8),%d0 | get frame format/vector offset 321 andw #0x0FFF,%d0 | clear out frame format 322 cmpw #12,%d0 | address error vector? 323 jeq Lisaerr | yes, go to it 324 #if 0 325 movl %d1,%a0 | fault address 326 .long 0xf0109e11 | ptestr #1,%a0@,#7 327 .long 0xf0176200 | pmove %psr,%sp@ 328 btst #7,%sp@ | bus error bit set? 329 jeq Lismerr | no, must be MMU fault 330 clrw %sp@ | yes, re-clear pad word 331 #endif 332 jra Lisberr | and process as normal bus error 333 Lismerr: 334 movl #T_MMUFLT,%sp@- | show that we are an MMU fault 335 jra Lbexit | and deal with it 336 Lisaerr: 337 movl #T_ADDRERR,%sp@- | mark address error 338 jra Lbexit | and deal with it 339 Lisberr: 340 movl #T_BUSERR,%sp@- | mark bus error 341 Lbexit: 342 jbsr _C_LABEL(trap) | handle the error 343 lea %sp@(12),%sp | pop value args 344 movl %sp@(60),%a0 | restore user SP 345 movl %a0,%usp | from save area 346 moveml %sp@+,#0x7FFF | restore most user regs 347 addql #4,%sp | toss SSP 348 tstw %sp@+ | do we need to clean up stack? 349 jeq _ASM_LABEL(rei) | no, just continue 350 btst #7,%sp@(6) | type 9/10/11 frame? 351 jeq _ASM_LABEL(rei) | no, nothing to do 352 btst #5,%sp@(6) | type 9? 353 jne Lbex1 | no, skip 354 movw %sp@,%sp@(12) | yes, push down SR 355 movl %sp@(2),%sp@(14) | and PC 356 clrw %sp@(18) | and mark as type 0 frame 357 lea %sp@(12),%sp | clean the excess 358 jra _ASM_LABEL(rei) | all done 359 Lbex1: 360 btst #4,%sp@(6) | type 10? 361 jne Lbex2 | no, skip 362 movw %sp@,%sp@(24) | yes, push down SR 363 movl %sp@(2),%sp@(26) | and PC 364 clrw %sp@(30) | and mark as type 0 frame 365 lea %sp@(24),%sp | clean the excess 366 jra _ASM_LABEL(rei) | all done 367 Lbex2: 368 movw %sp@,%sp@(84) | type 11, push down SR 369 movl %sp@(2),%sp@(86) | and PC 370 clrw %sp@(90) | and mark as type 0 frame 371 lea %sp@(84),%sp | clean the excess 372 jra _ASM_LABEL(rei) | all done 373 374 ENTRY_NOPROFILE(illinst) 375 clrw %sp@- 376 moveml #0xFFFF,%sp@- 377 moveq #T_ILLINST,%d0 378 jra _C_LABEL(fault) 379 380 ENTRY_NOPROFILE(zerodiv) 381 clrw %sp@- 382 moveml #0xFFFF,%sp@- 383 moveq #T_ZERODIV,%d0 384 jra _C_LABEL(fault) 385 386 ENTRY_NOPROFILE(chkinst) 387 clrw %sp@- 388 moveml #0xFFFF,%sp@- 389 moveq #T_CHKINST,%d0 390 jra _C_LABEL(fault) 391 392 ENTRY_NOPROFILE(trapvinst) 393 clrw %sp@- 394 moveml #0xFFFF,%sp@- 395 moveq #T_TRAPVINST,%d0 396 jra _C_LABEL(fault) 397 398 ENTRY_NOPROFILE(privinst) 399 clrw %sp@- 400 moveml #0xFFFF,%sp@- 401 moveq #T_PRIVINST,%d0 402 jra _C_LABEL(fault) 403 404 ENTRY_NOPROFILE(coperr) 405 clrw %sp@- 406 moveml #0xFFFF,%sp@- 407 moveq #T_COPERR,%d0 408 jra _C_LABEL(fault) 409 410 ENTRY_NOPROFILE(fmterr) 411 clrw %sp@- 412 moveml #0xFFFF,%sp@- 413 moveq #T_FMTERR,%d0 414 jra _C_LABEL(fault) 415 416 ENTRY_NOPROFILE(fptrap) 417 #ifdef FPCOPROC 418 clrw %sp@- | pad SR to longword 419 moveml #0xFFFF,%sp@- | save user registers 420 movl %usp,%a0 | and save 421 movl %a0,%sp@(60) | the user stack pointer 422 clrl %sp@- | no VA arg 423 #if 0 424 lea _u+PCB_FPCTX,%a0 | address of FP savearea 425 .word 0xf310 | fsave %a0@ 426 tstb %a0@ | null state frame? 427 jeq Lfptnull | yes, safe 428 clrw %d0 | no, need to tweak BIU 429 movb a0@(1),d0 | get frame size 430 bset #3,%a0@(0,%d0:w) | set exc_pend bit of BIU 431 Lfptnull: 432 .word 0xf227,0xa800 | fmovem %fpsr,%sp@- (code arg) 433 .word 0xf350 | frestore %a0@ 434 #else 435 clrl %sp@- | push dummy FPSR 436 #endif 437 movl #T_FPERR,%sp@- | push type arg 438 jbsr _C_LABEL(trap) | call trap 439 lea %sp@(12),%sp | pop value args 440 movl %sp@(60),%a0 | restore 441 movl %a0,%usp | user SP 442 moveml %sp@+,#0x7FFF | and remaining user registers 443 addql #6,%sp | pop SSP and align word 444 jra _ASM_LABEL(rei) | all done 445 #else 446 jra _C_LABEL(badtrap) | treat as an unexpected trap 447 #endif 448 449 ENTRY_NOPROFILE(fault) 450 movl %usp,%a0 | get and save 451 movl %a0,%sp@(60) | the user stack pointer 452 clrl %sp@- | no VA arg 453 clrl %sp@- | or code arg 454 movl %d0,%sp@- | push trap type 455 jbsr _C_LABEL(trap) | handle trap 456 lea %sp@(12),%sp | pop value args 457 movl %sp@(60),%a0 | restore 458 movl %a0,%usp | user SP 459 moveml %sp@+,#0x7FFF | restore most user regs 460 addql #6,%sp | pop SP and pad word 461 jra _ASM_LABEL(rei) | all done 462 463 ENTRY_NOPROFILE(badtrap) 464 clrw %sp@- 465 moveml #0xC0C0,%sp@- 466 movw %sp@(24),%sp@- 467 clrw %sp@- 468 jbsr _C_LABEL(straytrap) 469 addql #4,%sp 470 moveml %sp@+,#0x0303 471 addql #2,%sp 472 jra _ASM_LABEL(rei) 473 474 /* 475 * Interrupt handlers. 476 * All device interrupts are auto-vectored. Most can be configured 477 * to interrupt in the range IPL2 to IPL6. Here are our assignments: 478 * 479 * Level 0: 480 * Level 1: 481 * Level 2: SCSI SPC 482 * Level 3: LANCE Ethernet 483 * Level 4: 484 * Level 5: System Clock 485 * Level 6: Internal SIO used uPD7201A 486 * Level 7: NMI: Abort Key (Dispatched vector to ROM monitor) 487 */ 488 489 ENTRY_NOPROFILE(lev2intr) 490 clrw %sp@- 491 moveml #0xC0C0,%sp@- 492 jbsr _C_LABEL(scintr) 493 moveml %sp@+,#0x0303 494 addql #2,%sp 495 jra _ASM_LABEL(rei) 496 497 ENTRY_NOPROFILE(lev3intr) 498 clrw %sp@- 499 moveml #0xC0C0,%sp@- 500 jbsr _C_LABEL(lance_intr) 501 moveml %sp@+,#0x0303 502 addql #2,%sp 503 jra _ASM_LABEL(rei) 504 505 ENTRY_NOPROFILE(lev5intr) 506 clrw %sp@- | push pad word 507 moveml #0xC0C0,%sp@- | save scratch regs 508 movl #CLOCK_REG,%a0 | get clock CR addr 509 movb #CLK_CLR,%a0@ | reset system clock 510 lea %sp@(16),%a1 | get pointer to PS 511 movl %a1@,%sp@- | push padded PS 512 movl %a1@(4),%sp@- | push PC 513 jbsr _C_LABEL(hardclock) | call generic clock int routine 514 addql #8,%sp | pop params 515 moveml %sp@+,#0x0303 | restore scratch regs 516 addql #2,%sp | pop pad word 517 jra _ASM_LABEL(rei) | all done 518 519 ENTRY_NOPROFILE(hardclock) 520 addql #1,_C_LABEL(tick) 521 rts 522 523 BSS(tick,4) 524 525 ENTRY_NOPROFILE(lev6intr) 526 clrw %sp@- 527 moveml #0xC0C0,%sp@- 528 jbsr _C_LABEL(_siointr) 529 moveml %sp@+,#0x0303 530 addql #2,%sp 531 jra _ASM_LABEL(rei) 532 533 534 /* 535 * Emulation of VAX REI instruction. 536 * 537 * This code deals with checking for and servicing ASTs 538 * (profiling, scheduling) and software interrupts (network, softclock). 539 * We check for ASTs first, just like the VAX. To avoid excess overhead 540 * the T_ASTFLT handling code will also check for software interrupts so we 541 * do not have to do it here. 542 * 543 * This code is complicated by the fact that sendsig may have been called 544 * necessitating a stack cleanup. A cleanup should only be needed at this 545 * point for coprocessor mid-instruction frames (type 9), but we also test 546 * for bus error frames (type 10 and 11). 547 */ 548 #if 0 549 .comm _ssir,1 550 ASENTRY_NOPROFILE(rei) 551 #ifdef DEBUG 552 tstl _C_LABEL(panicstr) | have we panicked? 553 jne Ldorte | yes, do not make matters worse 554 #endif 555 btst #PCB_ASTB,_u+PCB_FLAGS+1| AST pending? 556 jeq Lchksir | no, go check for SIR 557 btst #5,%sp@ | yes, are we returning to user mode? 558 jne Lchksir | no, go check for SIR 559 clrw %sp@- | pad SR to longword 560 moveml #0xFFFF,%sp@- | save all registers 561 movl %usp,%a1 | including 562 movl %a1,%sp@(60) | the users SP 563 clrl %sp@- | VA == none 564 clrl %sp@- | code == none 565 movl #T_ASTFLT,%sp@- | type == async system trap 566 jbsr _C_LABEL(trap) | go handle it 567 lea %sp@(12),%sp | pop value args 568 movl %sp@(60),%a0 | restore 569 movl %a0,%usp | user SP 570 moveml %sp@+,#0x7FFF | and all remaining registers 571 addql #4,%sp | toss SSP 572 tstw %sp@+ | do we need to clean up stack? 573 jeq Ldorte | no, just continue 574 btst #7,%sp@(6) | type 9/10/11 frame? 575 jeq Ldorte | no, nothing to do 576 btst #5,%sp@(6) | type 9? 577 jne Last1 | no, skip 578 movw %sp@,%sp@(12) | yes, push down SR 579 movl %sp@(2),%sp@(14) | and PC 580 clrw %sp@(18) | and mark as type 0 frame 581 lea %sp@(12),%sp | clean the excess 582 jra Ldorte | all done 583 Last1: 584 btst #4,%sp@(6) | type 10? 585 jne Last2 | no, skip 586 movw %sp@,%sp@(24) | yes, push down SR 587 movl %sp@(2),%sp@(26) | and PC 588 clrw %sp@(30) | and mark as type 0 frame 589 lea %sp@(24),%sp | clean the excess 590 jra Ldorte | all done 591 Last2: 592 movw %sp@,%sp@(84) | type 11, push down SR 593 movl %sp@(2),%sp@(86) | and PC 594 clrw %sp@(90) | and mark as type 0 frame 595 lea %sp@(84),%sp | clean the excess 596 jra Ldorte | all done 597 Lchksir: 598 tstb _ssir | SIR pending? 599 jeq Ldorte | no, all done 600 movl %d0,%sp@- | need a scratch register 601 movw %sp@(4),%d0 | get SR 602 andw #PSL_IPL7,%d0 | mask all but IPL 603 jne Lnosir | came from interrupt, no can do 604 movl %sp@+,%d0 | restore scratch register 605 Lgotsir: 606 movw #SPL1,%sr | prevent others from servicing int 607 tstb _ssir | too late? 608 jeq Ldorte | yes, oh well... 609 clrw %sp@- | pad SR to longword 610 moveml #0xFFFF,%sp@- | save all registers 611 movl %usp,%a1 | including 612 movl %a1,%sp@(60) | the users SP 613 clrl %sp@- | VA == none 614 clrl %sp@- | code == none 615 movl #T_SSIR,%sp@- | type == software interrupt 616 jbsr _trap | go handle it 617 lea %sp@(12),%sp | pop value args 618 movl %sp@(60),%a0 | restore 619 movl %a0,%usp | user SP 620 moveml %sp@+,#0x7FFF | and all remaining registers 621 addql #6,%sp | pop SSP and align word 622 rte 623 Lnosir: 624 movl %sp@+,%d0 | restore scratch register 625 Ldorte: 626 #else 627 ASENTRY_NOPROFILE(rei) | dummy Entry of rei 628 #endif 629 rte | real return 630 631 /* 632 * non-local gotos 633 */ 634 ALTENTRY(savectx, _setjmp) 635 ENTRY(setjmp) 636 movl %sp@(4),%a0 | savearea pointer 637 moveml #0xFCFC,%a0@ | save d2-d7/a2-a7 638 movl %sp@,%a0@(48) | and return address 639 moveq #0,%d0 | return 0 640 rts 641 642 ENTRY(qsetjmp) 643 movl %sp@(4),%a0 | savearea pointer 644 lea %a0@(40),%a0 | skip regs we do not save 645 movl %a6,%a0@+ | save FP 646 movl %sp,%a0@+ | save SP 647 movl %sp@,%a0@ | and return address 648 moveq #0,%d0 | return 0 649 rts 650 651 ENTRY(longjmp) 652 movl %sp@(4),%a0 653 moveml %a0@+,#0xFCFC 654 movl %a0@,%sp@ 655 moveq #1,%d0 656 rts 657 658 ENTRY_NOPROFILE(getsfc) 659 movc %sfc,%d0 660 rts 661 ENTRY_NOPROFILE(getdfc) 662 movc %dfc,%d0 663 rts 664 665 /* 666 * Set processor priority level calls. Most could (should) be replaced 667 * by inline asm expansions. However, SPL0 and SPLX require special 668 * handling. If we are returning to the base processor priority (SPL0) 669 * we need to check for our emulated software interrupts. 670 */ 671 672 ENTRY(spl0) 673 moveq #0,%d0 674 movw %sr,%d0 | get old SR for return 675 movw #PSL_LOWIPL,%sr | restore new SR 676 | jra Lsplsir 677 rts 678 679 ENTRY(splx) 680 moveq #0,%d0 681 movw %sr,%d0 | get current SR for return 682 movw %sp@(6),%d1 | get new value 683 movw %d1,%sr | restore new SR 684 | andw #PSL_IPL7,%d1 | mask all but PSL_IPL 685 | jne Lspldone | non-zero, all done 686 |Lsplsir: 687 | tstb _ssir | software interrupt pending? 688 | jeq Lspldone | no, all done 689 | subql #4,%sp | make room for RTE frame 690 | movl %sp@(4),%sp@(2) | position return address 691 | clrw %sp@(6) | set frame type 0 692 | movw #PSL_LOWIPL,%sp@ | and new SR 693 | jra Lgotsir | go handle it 694 |Lspldone: 695 rts 696 697 ENTRY(spl1) 698 moveq #0,%d0 699 movw %sr,%d0 700 movw #SPL1,%sr 701 rts 702 703 ALTENTRY(splscsi, _spl2) 704 ENTRY(spl2) 705 moveq #0,%d0 706 movw %sr,%d0 707 movw #SPL2,%sr 708 rts 709 710 ENTRY(spl3) 711 moveq #0,%d0 712 movw %sr,%d0 713 movw #SPL3,%sr 714 rts 715 716 ENTRY(spl4) 717 moveq #0,%d0 718 movw %sr,%d0 719 movw #SPL4,%sr 720 rts 721 722 ENTRY(spl5) 723 moveq #0,%d0 724 movw %sr,%d0 725 movw #SPL5,%sr 726 rts 727 728 ENTRY(spl6) 729 moveq #0,%d0 730 movw %sr,%d0 731 movw #SPL6,%sr 732 rts 733 734 ALTENTRY(splhigh, _spl7) 735 ENTRY(spl7) 736 moveq #0,%d0 737 movw %sr,%d0 738 movw #PSL_HIGHIPL,%sr 739 rts 740 741 742 .data 743 744 /* 745 * Memory Information Field for secondary booter memory allocator 746 */ 747 748 ASLOCAL(romvbr) 749 .long 0 750 751 GLOBAL(dipsw1) 752 .long 0 753 754 GLOBAL(dipsw2) 755 .long 0 756 757 GLOBAL(cputype) 758 .long CPU_68030 759
Indexes created Wed Oct 22 13:09:56 GMT 2025