subr.S revision 1.20
1 /* $NetBSD: subr.S,v 1.20 2008/02/05 00:04:24 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_compat_16___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_compat_16___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): 210 pushr $0x3f 211 .word 0x9f16 # jsb to absolute address 212 .long _C_LABEL(cmn_idsptch) # the absolute address 213 .long 0 # the callback interrupt routine 214 .long 0 # its argument 215 .long 0 # ptr to correspond evcnt struct 216 _C_LABEL(eidsptch): 217 218 _C_LABEL(cmn_idsptch): 219 #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG) 220 calls $0,_C_LABEL(krnlock) 221 #endif 222 movl (%sp)+,%r0 # get pointer to idspvec 223 mtpr $IPL_VM,$PR_IPL # Make sure we are at IPL_VM 224 movl 8(%r0),%r1 # get evcnt pointer 225 beql 1f # no ptr, skip increment 226 incl EV_COUNT(%r1) # increment low longword 227 adwc $0,EV_COUNT+4(%r1) # add any carry to hi longword 228 1: incl _C_LABEL(uvmexp)+UVME_INTRS # increment uvmexp.intrs 229 #if 0 230 pushl %r0 231 movq (%r0),-(%sp) 232 pushab 2f 233 calls $3,_C_LABEL(printf) 234 movl (%sp)+,%r0 235 #endif 236 pushl 4(%r0) # push argument 237 calls $1,*(%r0) # call interrupt routine 238 #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG) 239 calls $0,_C_LABEL(krnunlock) 240 #endif 241 popr $0x3f # pop registers 242 rei # return from interrut 243 #if 0 244 2: .asciz "intr %p(%p)\n" 245 #endif 246 247 ENTRY(badaddr,0) # Called with addr,b/w/l 248 mfpr $PR_IPL,%r0 # splhigh() 249 mtpr $IPL_HIGH,$PR_IPL 250 movl 4(%ap),%r2 # First argument, the address 251 movl 8(%ap),%r1 # Sec arg, b,w,l 252 pushl %r0 # Save old IPL 253 clrl %r3 254 movab 4f,_C_LABEL(memtest) # Set the return address 255 256 caseb %r1,$1,$4 # What is the size 257 1: .word 1f-1b 258 .word 2f-1b 259 .word 3f-1b # This is unused 260 .word 3f-1b 261 262 1: movb (%r2),%r1 # Test a byte 263 brb 5f 264 265 2: movw (%r2),%r1 # Test a word 266 brb 5f 267 268 3: movl (%r2),%r1 # Test a long 269 brb 5f 270 271 4: incl %r3 # Got machine chk => addr bad 272 5: mtpr (%sp)+,$PR_IPL 273 movl %r3,%r0 274 ret 275 276 #ifdef DDB 277 /* 278 * DDB is the only routine that uses setjmp/longjmp. 279 */ 280 .globl _C_LABEL(setjmp), _C_LABEL(longjmp) 281 _C_LABEL(setjmp):.word 0 282 movl 4(%ap), %r0 283 movl 8(%fp), (%r0) 284 movl 12(%fp), 4(%r0) 285 movl 16(%fp), 8(%r0) 286 moval 28(%fp),12(%r0) 287 clrl %r0 288 ret 289 290 _C_LABEL(longjmp):.word 0 291 movl 4(%ap), %r1 292 movl 8(%ap), %r0 293 movl (%r1), %ap 294 movl 4(%r1), %fp 295 movl 12(%r1), %sp 296 jmp *8(%r1) 297 #endif 298 299 #if defined(MULTIPROCESSOR) 300 .align 2 301 .globl _C_LABEL(vax_mp_tramp) # used to kick off multiprocessor systems. 302 _C_LABEL(vax_mp_tramp): 303 ldpctx 304 rei 305 #endif 306 307 /* 308 * Helper routine for cpu_lwp_fork. It get invoked by Swtchto. 309 * It let's the kernel know the lwp is alive and then calls func(arg) 310 * and possibly returns to sret. 311 */ 312 ENTRY(cpu_lwp_bootstrap, 0) 313 movq %r2,-(%sp) /* save func & arg */ 314 movq %r0,-(%sp) /* push oldl/newl */ 315 calls $2,_C_LABEL(lwp_startup) /* startup the lwp */ 316 movl (%sp)+,%r0 /* grab func */ 317 calls $1,(%r0) /* call it with arg */ 318 ret 319 320 /* 321 * r1 = newlwp 322 * r0 = oldlwp 323 */ 324 JSBENTRY(Swtchto) 325 /* this pops the pc and psw from the stack and puts them in the pcb. */ 326 svpctx # Now on interrupt stack 327 328 /* We can know use any register because ldpctx will overwrite them */ 329 /* New LWP already in %r1 */ 330 mfpr $PR_SSP,%r4 # Get curcpu 331 movl %r1,CI_CURLWP(%r4) # update ci_curlwp 332 movl L_ADDR(%r1),%r3 # Get pointer to new pcb. 333 movl %r0,PCB_R0(%r3) # move r0 into new pcb (return value) 334 movl %r4,SSP(%r3) # Put curcpu into new PCB 335 addl3 %r3,$IFTRAP,%r4 # Save for copy* functions. 336 mtpr %r4,$PR_ESP # Use ESP as CPU-specific pointer 337 movl %r4,ESP(%r3) # Must save in PCB also. 338 339 extzv $9,$21,%r3,%r1 # extract offset of PCB 340 ashl $9,*_C_LABEL(Sysmap)[%r1],%r4 341 342 mtpr %r4,$PR_PCBB # set PA of new pcb 343 ldpctx # load it 344 /* r0 already has previous lwp */ 345 /* r1 already has this lwp */ 346 /* r2/r3 and r4/r5 restored */ 347 rei /* get off interrupt stack */ 348 349 # 350 # copy/fetch/store routines. 351 # 352 353 ENTRY(copyout, 0) 354 movl 8(%ap),%r2 355 blss 3f # kernel space 356 movl 4(%ap),%r1 357 brb 2f 358 359 ENTRY(copyin, 0) 360 movl 4(%ap),%r1 361 blss 3f # kernel space 362 movl 8(%ap),%r2 363 2: mfpr $PR_ESP,%r3 364 movab 1f,(%r3) 365 movc3 12(%ap),(%r1),(%r2) 366 1: mfpr $PR_ESP,%r3 367 clrl (%r3) 368 ret 369 370 3: mnegl $1,%r0 371 ret 372 373 ENTRY(kcopy,0) 374 mfpr $PR_ESP,%r3 375 movl (%r3),-(%sp) 376 movab 1f,(%r3) 377 movl 4(%ap),%r1 378 movl 8(%ap),%r2 379 movc3 12(%ap),(%r1), (%r2) 380 clrl %r1 381 1: mfpr $PR_ESP,%r3 382 movl (%sp)+,(%r3) 383 movl %r1,%r0 384 ret 385 386 /* 387 * copy{in,out}str() copies data from/to user space to/from kernel space. 388 * Security checks: 389 * 1) user space address must be < KERNBASE 390 * 2) the VM system will do the checks while copying 391 */ 392 ENTRY(copyinstr, 0) 393 tstl 4(%ap) # kernel address? 394 bgeq 8f # no, continue 395 6: movl $EFAULT,%r0 396 movl 16(%ap),%r2 397 beql 7f 398 clrl (%r2) 399 7: ret 400 401 ENTRY(copyoutstr, 0) 402 tstl 8(%ap) # kernel address? 403 bgeq 8f # no, continue 404 brb 6b # yes, return EFAULT 405 406 ENTRY(copystr,0) 407 8: movl 4(%ap),%r5 # from 408 movl 8(%ap),%r4 # to 409 movl 12(%ap),%r3 # len 410 movl 16(%ap),%r2 # copied 411 clrl %r0 412 mfpr $PR_ESP,%r1 413 movab 3f,(%r1) 414 415 tstl %r3 # any chars to copy? 416 bneq 1f # yes, jump for more 417 0: tstl %r2 # save copied len? 418 beql 2f # no 419 subl3 4(%ap),%r5,(%r2) # save copied len 420 2: ret 421 422 1: movb (%r5)+,(%r4)+ # copy one char 423 beql 0b # jmp if last char 424 sobgtr %r3,1b # copy one more 425 movl $ENAMETOOLONG,%r0 # inform about too long string 426 brb 0b # out of chars 427 428 3: mfpr $PR_ESP,%r1 429 clrl (%r1) 430 brb 0b 431 432 ENTRY(subyte,0) 433 movl 4(%ap),%r0 434 blss 3f # illegal space 435 mfpr $PR_ESP,%r1 436 movab 1f,(%r1) 437 movb 8(%ap),(%r0) 438 clrl %r1 439 1: mfpr $PR_ESP,%r2 440 clrl (%r2) 441 movl %r1,%r0 442 ret 443 444 ENTRY(suword,0) 445 movl 4(%ap),%r0 446 blss 3f # illegal space 447 mfpr $PR_ESP,%r1 448 movab 1f,(%r1) 449 movl 8(%ap),(%r0) 450 clrl %r1 451 1: mfpr $PR_ESP,%r2 452 clrl (%r2) 453 movl %r1,%r0 454 ret 455 456 ENTRY(suswintr,0) 457 movl 4(%ap),%r0 458 blss 3f # illegal space 459 mfpr $PR_ESP,%r1 460 movab 1f,(%r1) 461 movw 8(%ap),(%r0) 462 clrl %r1 463 1: mfpr $PR_ESP,%r2 464 clrl (%r2) 465 movl %r1,%r0 466 ret 467 468 3: mnegl $1,%r0 469 ret 470 471 .align 2 472 ALTENTRY(fusword) 473 ENTRY(fuswintr,0) 474 movl 4(%ap),%r0 475 blss 3b 476 mfpr $PR_ESP,%r1 477 movab 1f,(%r1) 478 movzwl (%r0),%r1 479 1: mfpr $PR_ESP,%r2 480 clrl (%r2) 481 movl %r1,%r0 482 ret 483 484 JSBENTRY(Slock) 485 1: bbssi $0,(%r1),1b 486 rsb 487 488 JSBENTRY(Slocktry) 489 clrl %r0 490 bbssi $0,(%r1),1f 491 incl %r0 492 1: rsb 493 494 JSBENTRY(Sunlock) 495 bbcci $0,(%r1),1f 496 1: rsb 497 498 # 499 # data department 500 # 501 .data 502 503 .globl _C_LABEL(memtest) 504 _C_LABEL(memtest): # memory test in progress 505 .long 0 506 507 #ifdef __ELF__ 508 .section .rodata 509 #endif 510 noque: .asciz "swtch" 511
Indexes created Mon Sep 29 21:09:56 GMT 2025