subr.S revision 1.3
1 /* $NetBSD: subr.S,v 1.3 2002/03/31 00:11:13 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Ludd, University of Lule}, Sweden. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed at Ludd, University of Lule}. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <machine/asm.h> 34 35 #include "assym.h" 36 #include "opt_ddb.h" 37 #include "opt_multiprocessor.h" 38 #include "opt_lockdebug.h" 39 #include "opt_compat_netbsd.h" 40 #include "opt_compat_ibcs2.h" 41 #ifdef COMPAT_IBCS2 42 #include <compat/ibcs2/ibcs2_syscall.h> 43 #endif 44 #include "opt_compat_ultrix.h" 45 #ifdef COMPAT_ULTRIX 46 #include <compat/ultrix/ultrix_syscall.h> 47 #endif 48 49 #define JSBENTRY(x) .globl x ; .align 2 ; x : 50 51 .text 52 53 #ifdef KERNEL_LOADABLE_BY_MOP 54 /* 55 * This is a little tricky. The kernel is not loaded at the correct 56 * address, so the kernel must first be relocated, then copied, then 57 * jump back to the correct address. 58 */ 59 /* Copy routine */ 60 cps: 61 2: movb (%r0)+,(%r1)+ 62 cmpl %r0,%r7 63 bneq 2b 64 65 3: clrb (%r1)+ 66 incl %r0 67 cmpl %r0,%r6 68 bneq 3b 69 clrl -(%sp) 70 movl %sp,%ap 71 movl $_cca,%r7 72 movl %r8,(%r7) 73 movpsl -(%sp) 74 pushl %r2 75 rei 76 cpe: 77 78 /* Copy the copy routine */ 79 1: movab cps,%r0 80 movab cpe,%r1 81 movl $0x300000,%sp 82 movl %sp,%r3 83 4: movb (%r0)+,(%r3)+ 84 cmpl %r0,%r1 85 bneq 4b 86 movl %r7,%r8 87 /* Ok, copy routine copied, set registers and rei */ 88 movab _edata,%r7 89 movab _end,%r6 90 movl $0x80000000,%r1 91 movl $0x80000200,%r0 92 subl3 $0x200,%r6,%r9 93 movab 2f,%r2 94 subl2 $0x200,%r2 95 movpsl -(%sp) 96 pushab 4(%sp) 97 rei 98 99 /* 100 * First entry routine from boot. This should be in a file called locore. 101 */ 102 JSBENTRY(start) 103 brb 1b # Netbooted starts here 104 #else 105 ASENTRY(start, 0) 106 #endif 107 2: bisl3 $0x80000000,%r9,_C_LABEL(esym) # End of loaded code 108 pushl $0x1f0000 # Push a nice PSL 109 pushl $to # Address to jump to 110 rei # change to kernel stack 111 to: movw $0xfff,_C_LABEL(panic) # Save all regs in panic 112 cmpb (%ap),$3 # symbols info present? 113 blssu 3f # nope, skip 114 bisl3 $0x80000000,8(%ap),_C_LABEL(symtab_start) 115 # save start of symtab 116 movl 12(%ap),_C_LABEL(symtab_nsyms) # save number of symtab 117 bisl3 $0x80000000,%r9,_C_LABEL(symtab_end) 118 # save end of symtab 119 3: addl3 _C_LABEL(esym),$0x3ff,%r0 # Round symbol table end 120 bicl3 $0x3ff,%r0,_C_LABEL(proc0paddr) # save proc0 uarea pointer 121 bicl3 $0x80000000,_C_LABEL(proc0paddr),%r0 # get phys proc0 uarea addr 122 mtpr %r0,$PR_PCBB # Save in IPR PCBB 123 addl3 $USPACE,_C_LABEL(proc0paddr),%r0 # Get kernel stack top 124 mtpr %r0,$PR_KSP # put in IPR KSP 125 movl %r0,_C_LABEL(Sysmap) # SPT start addr after KSP 126 movl _C_LABEL(proc0paddr),%r0 # get PCB virtual address 127 movab IFTRAP(%r0),4(%r0) # Save trap address in ESP 128 mtpr 4(%r0),$PR_ESP # Put it in ESP also 129 130 # Set some registers in known state 131 movl _C_LABEL(proc0paddr),%r0 132 clrl P0LR(%r0) 133 clrl P1LR(%r0) 134 mtpr $0,$PR_P0LR 135 mtpr $0,$PR_P1LR 136 movl $0x80000000,%r1 137 movl %r1,P0BR(%r0) 138 movl %r1,P1BR(%r0) 139 mtpr %r1,$PR_P0BR 140 mtpr %r1,$PR_P1BR 141 clrl IFTRAP(%r0) 142 mtpr $0,$PR_SCBB 143 144 # Copy the RPB to its new position 145 #if defined(COMPAT_14) 146 tstl (%ap) # Any arguments? 147 bneq 1f # Yes, called from new boot 148 movl %r11,_C_LABEL(boothowto) # Howto boot (single etc...) 149 # movl %r10,_C_LABEL(bootdev) # uninteresting, will complain 150 movl %r8,_C_LABEL(avail_end) # Usable memory (from VMB) 151 clrl -(%sp) # Have no RPB 152 brb 2f 153 #endif 154 155 1: pushl 4(%ap) # Address of old rpb 156 2: calls $1,_C_LABEL(_start) # Jump away. 157 /* NOTREACHED */ 158 159 160 /* 161 * Signal handler code. 162 */ 163 164 .align 2 165 .globl _C_LABEL(sigcode),_C_LABEL(esigcode) 166 _C_LABEL(sigcode): 167 pushr $0x3f 168 subl2 $0xc,%sp 169 movl 0x24(%sp),%r0 170 calls $3,(%r0) 171 popr $0x3f 172 chmk $SYS___sigreturn14 173 chmk $SYS_exit 174 halt 175 _C_LABEL(esigcode): 176 177 #ifdef COMPAT_IBCS2 178 .align 2 179 .globl _C_LABEL(ibcs2_sigcode),_C_LABEL(ibcs2_esigcode) 180 _C_LABEL(ibcs2_sigcode): 181 pushr $0x3f 182 subl2 $0xc,%sp 183 movl 0x24(%sp),%r0 184 calls $3,(%r0) 185 popr $0x3f 186 chmk $SYS___sigreturn14 187 chmk $SYS_exit 188 halt 189 _C_LABEL(ibcs2_esigcode): 190 #endif /* COMPAT_IBCS2 */ 191 192 #ifdef COMPAT_ULTRIX 193 .align 2 194 .globl _C_LABEL(ultrix_sigcode),_C_LABEL(ultrix_esigcode) 195 _C_LABEL(ultrix_sigcode): 196 pushr $0x3f 197 subl2 $0xc,%sp 198 movl 0x24(%sp),%r0 199 calls $3,(%r0) 200 popr $0x3f 201 chmk $ULTRIX_SYS_sigreturn 202 chmk $SYS_exit 203 halt 204 _C_LABEL(ultrix_esigcode): 205 #endif 206 207 .align 2 208 .globl _C_LABEL(idsptch), _C_LABEL(eidsptch) 209 _C_LABEL(idsptch): pushr $0x3f 210 .word 0x9f16 # jsb to absolute address 211 .long _C_LABEL(cmn_idsptch) # the absolute address 212 .long 0 # the callback interrupt routine 213 .long 0 # its argument 214 .long 0 # ptr to correspond evcnt struct 215 _C_LABEL(eidsptch): 216 217 _C_LABEL(cmn_idsptch): 218 movl (%sp)+,%r0 # get pointer to idspvec 219 movl 8(%r0),%r1 # get evcnt pointer 220 beql 1f # no ptr, skip increment 221 incl EV_COUNT(%r1) # increment low longword 222 adwc $0,EV_COUNT+4(%r1) # add any carry to hi longword 223 1: pushl 4(%r0) # push argument 224 calls $1,*(%r0) # call interrupt routine 225 popr $0x3f # pop registers 226 rei # return from interrut 227 228 ENTRY(badaddr,0) # Called with addr,b/w/l 229 mfpr $PR_IPL,%r0 # splhigh() 230 mtpr $IPL_HIGH,$PR_IPL 231 movl 4(%ap),%r2 # First argument, the address 232 movl 8(%ap),%r1 # Sec arg, b,w,l 233 pushl %r0 # Save old IPL 234 clrl %r3 235 movab 4f,_C_LABEL(memtest) # Set the return address 236 237 caseb %r1,$1,$4 # What is the size 238 1: .word 1f-1b 239 .word 2f-1b 240 .word 3f-1b # This is unused 241 .word 3f-1b 242 243 1: movb (%r2),%r1 # Test a byte 244 brb 5f 245 246 2: movw (%r2),%r1 # Test a word 247 brb 5f 248 249 3: movl (%r2),%r1 # Test a long 250 brb 5f 251 252 4: incl %r3 # Got machine chk => addr bad 253 5: mtpr (%sp)+,$PR_IPL 254 movl %r3,%r0 255 ret 256 257 #ifdef DDB 258 /* 259 * DDB is the only routine that uses setjmp/longjmp. 260 */ 261 .globl _C_LABEL(setjmp), _C_LABEL(longjmp) 262 _C_LABEL(setjmp):.word 0 263 movl 4(%ap), %r0 264 movl 8(%fp), (%r0) 265 movl 12(%fp), 4(%r0) 266 movl 16(%fp), 8(%r0) 267 moval 28(%fp),12(%r0) 268 clrl %r0 269 ret 270 271 _C_LABEL(longjmp):.word 0 272 movl 4(%ap), %r1 273 movl 8(%ap), %r0 274 movl (%r1), %ap 275 movl 4(%r1), %fp 276 movl 12(%r1), %sp 277 jmp *8(%r1) 278 #endif 279 280 # 281 # setrunqueue/remrunqueue fast variants. 282 # 283 284 JSBENTRY(Setrq) 285 #ifdef DIAGNOSTIC 286 tstl 4(%r0) # Check that process actually are off the queue 287 beql 1f 288 pushab setrq 289 calls $1,_C_LABEL(panic) 290 setrq: .asciz "setrunqueue" 291 #endif 292 1: extzv $2,$6,P_PRIORITY(%r0),%r1 # get priority 293 movaq _C_LABEL(sched_qs)[%r1],%r2 # get address of queue 294 insque (%r0),*PH_RLINK(%r2) # put proc last in queue 295 bbss %r1,_C_LABEL(sched_whichqs),1f # set queue bit. 296 1: rsb 297 298 JSBENTRY(Remrq) 299 extzv $2,$6,P_PRIORITY(%r0),%r1 300 #ifdef DIAGNOSTIC 301 bbs %r1,_C_LABEL(sched_whichqs),1f 302 pushab remrq 303 calls $1,_C_LABEL(panic) 304 remrq: .asciz "remrunqueue" 305 #endif 306 1: remque (%r0),%r2 307 bneq 2f # Not last process on queue 308 bbsc %r1,_C_LABEL(sched_whichqs),2f 309 2: clrl P_BACK(%r0) # saftey belt 310 rsb 311 312 # 313 # Idle loop. Here we could do something fun, maybe, like calculating 314 # pi or something. 315 # 316 idle: 317 #if defined(LOCKDEBUG) 318 calls $0,_C_LABEL(sched_unlock_idle) 319 #elif defined(MULTIPROCESSOR) 320 clrl _C_LABEL(sched_lock) # release sched lock 321 #endif 322 mtpr $1,$PR_IPL # IPL cannot be 0 because we are 323 # running on the interrupt stack 324 # and may get interrupts 325 326 1: tstl _C_LABEL(sched_whichqs) # Anything ready to run? 327 beql 1b # no, run the idle loop again. 328 /* Now try the test the long way */ 329 mtpr $IPL_HIGH,$PR_IPL # block all types of interrupts 330 #if defined(LOCKDEBUG) 331 calls $0,_C_LABEL(sched_lock_idle) 332 #elif defined(MULTIPROCESSOR) 333 3: bbssi $0,_C_LABEL(sched_lock),3b # acquire sched lock 334 #endif 335 brb lp # check sched_whichqs again 336 337 # 338 # cpu_switch, cpu_exit and the idle loop implemented in assembler 339 # for efficiency. %r6 contains pointer to last process. This is 340 # called at IPL_HIGH. 341 # 342 343 JSBENTRY(Swtch) 344 mfpr $PR_SSP,%r1 # Get ptr to this cpu_info struct 345 clrl CI_CURPROC(%r1) # Stop process accounting 346 svpctx # Save context if another CPU 347 # get control first (must be on 348 # the interrupt stack when idling) 349 350 351 lp: ffs $0,$32,_C_LABEL(sched_whichqs),%r3 # Search for bit set 352 beql idle # no bit set, go to idle loop 353 354 movaq _C_LABEL(sched_qs)[%r3],%r1 # get address of queue head 355 remque *(%r1),%r2 # remove proc pointed to by queue head 356 # proc ptr is now in %r2 357 #ifdef DIAGNOSTIC 358 bvc 1f # check if something on queue 359 pushab noque 360 calls $1,_C_LABEL(panic) 361 #endif 362 363 1: bneq 2f # more processes on queue? 364 bbsc %r3,_C_LABEL(sched_whichqs),2f # no, clear bit in whichqs 365 2: clrl P_BACK(%r2) # clear proc backpointer 366 mfpr $PR_SSP,%r1 # Get ptr to this cpu_info struct 367 /* p->p_cpu initialized in fork1() for single-processor */ 368 #if defined(MULTIPROCESSOR) 369 movl %r1,P_CPU(%r2) # p->p_cpu = curcpu(); 370 #endif 371 movb $SONPROC,P_STAT(%r2) # p->p_stat = SONPROC; 372 movl %r2,CI_CURPROC(%r1) # set new process running 373 clrl CI_WANT_RESCHED(%r1) # we are now changing process 374 movl P_ADDR(%r2),%r0 # Get pointer to new pcb. 375 addl3 %r0,$IFTRAP,%r1 # Save for copy* functions. 376 mtpr %r1,$PR_ESP # Use ESP as CPU-specific pointer 377 movl %r1,ESP(%r0) # Must save in PCB also. 378 mfpr $PR_SSP,%r1 # New process must inherit cpu_info 379 movl %r1,SSP(%r0) # Put it in new PCB 380 381 # 382 # Nice routine to get physical from virtual adresses. 383 # 384 extzv $9,$21,%r0,%r1 # extract offset 385 ashl $9,*_C_LABEL(Sysmap)[%r1],%r3 386 387 mtpr %r3,$PR_PCBB 388 ldpctx 389 #if defined(LOCKDEBUG) 390 calls $0,_C_LABEL(sched_unlock_idle) 391 #elif defined(MULTIPROCESSOR) 392 clrl _C_LABEL(sched_lock) # clear sched lock 393 #endif 394 rei 395 396 #if defined(MULTIPROCESSOR) 397 .align 2 398 .globl _C_LABEL(tramp) # used to kick off multiprocessor systems. 399 _C_LABEL(tramp): 400 ldpctx 401 rei 402 #endif 403 404 # 405 # the last routine called by a process. 406 # 407 408 ENTRY(cpu_exit,0) 409 movl 4(%ap),%r6 # Process pointer in %r6 410 mtpr $IPL_CLOCK,$PR_IPL # Block almost everything 411 mfpr $PR_SSP,%r7 # get cpu_info ptr 412 movl CI_EXIT(%r7),%r8 # scratch page address 413 movab 512(%r8),%sp # change stack 414 bicl2 $0xc0000000,%r8 # get physical address 415 mtpr %r8,$PR_PCBB # new PCB 416 mtpr %r7,$PR_SSP # In case... 417 pushl %r6 418 calls $1,_C_LABEL(exit2) # release last resources. 419 mtpr $IPL_HIGH,$PR_IPL # block all types of interrupts 420 #if defined(LOCKDEBUG) 421 calls $0,_C_LABEL(sched_lock_idle) 422 #elif defined(MULTIPROCESSOR) 423 1: bbssi $0,_C_LABEL(sched_lock),1b # acquire sched lock 424 #endif 425 clrl %r6 426 brw Swtch 427 428 # 429 # copy/fetch/store routines. 430 # 431 432 ENTRY(copyout, 0) 433 movl 8(%ap),%r2 434 blss 3f # kernel space 435 movl 4(%ap),%r1 436 brb 2f 437 438 ENTRY(copyin, 0) 439 movl 4(%ap),%r1 440 blss 3f # kernel space 441 movl 8(%ap),%r2 442 2: mfpr $PR_ESP,%r3 443 movab 1f,(%r3) 444 movc3 12(%ap),(%r1),(%r2) 445 1: mfpr $PR_ESP,%r3 446 clrl (%r3) 447 ret 448 449 3: mnegl $1,%r0 450 ret 451 452 ENTRY(kcopy,0) 453 mfpr $PR_ESP,%r3 454 movl (%r3),-(%sp) 455 movab 1f,(%r3) 456 movl 4(%ap),%r1 457 movl 8(%ap),%r2 458 movc3 12(%ap),(%r1), (%r2) 459 clrl %r1 460 1: mfpr $PR_ESP,%r3 461 movl (%sp)+,(%r3) 462 movl %r1,%r0 463 ret 464 465 /* 466 * copy{in,out}str() copies data from/to user space to/from kernel space. 467 * Security checks: 468 * 1) user space address must be < KERNBASE 469 * 2) the VM system will do the checks while copying 470 */ 471 ENTRY(copyinstr, 0) 472 tstl 4(%ap) # kernel address? 473 bgeq 8f # no, continue 474 6: movl $EFAULT,%r0 475 movl 16(%ap),%r2 476 beql 7f 477 clrl (%r2) 478 7: ret 479 480 ENTRY(copyoutstr, 0) 481 tstl 8(%ap) # kernel address? 482 bgeq 8f # no, continue 483 brb 6b # yes, return EFAULT 484 485 ENTRY(copystr,0) 486 8: movl 4(%ap),%r5 # from 487 movl 8(%ap),%r4 # to 488 movl 12(%ap),%r3 # len 489 movl 16(%ap),%r2 # copied 490 clrl %r0 491 mfpr $PR_ESP,%r1 492 movab 3f,(%r1) 493 494 tstl %r3 # any chars to copy? 495 bneq 1f # yes, jump for more 496 0: tstl %r2 # save copied len? 497 beql 2f # no 498 subl3 4(%ap),%r5,(%r2) # save copied len 499 2: ret 500 501 1: movb (%r5)+,(%r4)+ # copy one char 502 beql 0b # jmp if last char 503 sobgtr %r3,1b # copy one more 504 movl $ENAMETOOLONG,%r0 # inform about too long string 505 brb 0b # out of chars 506 507 3: mfpr $PR_ESP,%r1 508 clrl (%r1) 509 brb 0b 510 511 ENTRY(subyte,0) 512 movl 4(%ap),%r0 513 blss 3f # illegal space 514 mfpr $PR_ESP,%r1 515 movab 1f,(%r1) 516 movb 8(%ap),(%r0) 517 clrl %r1 518 1: mfpr $PR_ESP,%r2 519 clrl (%r2) 520 movl %r1,%r0 521 ret 522 523 ENTRY(suword,0) 524 movl 4(%ap),%r0 525 blss 3f # illegal space 526 mfpr $PR_ESP,%r1 527 movab 1f,(%r1) 528 movl 8(%ap),(%r0) 529 clrl %r1 530 1: mfpr $PR_ESP,%r2 531 clrl (%r2) 532 movl %r1,%r0 533 ret 534 535 ENTRY(suswintr,0) 536 movl 4(%ap),%r0 537 blss 3f # illegal space 538 mfpr $PR_ESP,%r1 539 movab 1f,(%r1) 540 movw 8(%ap),(%r0) 541 clrl %r1 542 1: mfpr $PR_ESP,%r2 543 clrl (%r2) 544 movl %r1,%r0 545 ret 546 547 3: mnegl $1,%r0 548 ret 549 550 .align 2 551 ALTENTRY(fusword) 552 ENTRY(fuswintr,0) 553 movl 4(%ap),%r0 554 blss 3b 555 mfpr $PR_ESP,%r1 556 movab 1f,(%r1) 557 movzwl (%r0),%r1 558 1: mfpr $PR_ESP,%r2 559 clrl (%r2) 560 movl %r1,%r0 561 ret 562 563 #if defined(MULTIPROCESSOR) 564 565 JSBENTRY(Slock) 566 1: bbssi $0,(%r1),1b 567 rsb 568 569 JSBENTRY(Slocktry) 570 clrl %r0 571 bbssi $0,(%r1),1f 572 incl %r0 573 1: rsb 574 575 JSBENTRY(Sunlock) 576 bbcci $0,(%r1),1f 577 1: rsb 578 579 #endif 580 581 # 582 # data department 583 # 584 .data 585 586 .globl _C_LABEL(memtest) 587 _C_LABEL(memtest): # memory test in progress 588 .long 0 589 590 #ifdef __ELF__ 591 .section .rodata 592 #endif 593 noque: .asciz "swtch" 594
Indexes created Tue Sep 23 14:10:03 GMT 2025