trap_subr64.S revision 275268
1/* $FreeBSD: head/sys/powerpc/aim/trap_subr64.S 275268 2014-11-29 20:54:33Z jhibbits $ */ 2/* $NetBSD: trap_subr.S,v 1.20 2002/04/22 23:20:08 kleink Exp $ */ 3 4/*- 5 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 6 * Copyright (C) 1995, 1996 TooLs GmbH. 7 * All rights reserved. 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 TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35/* 36 * NOTICE: This is not a standalone file. to use it, #include it in 37 * your port's locore.S, like so: 38 * 39 * #include <powerpc/aim/trap_subr.S> 40 */ 41 42/* 43 * Save/restore segment registers 44 */ 45 46/* 47 * Restore SRs for a pmap 48 * 49 * Requires that r28-r31 be scratch, with r28 initialized to the SLB cache 50 */ 51 52/* 53 * User SRs are loaded through a pointer to the current pmap. 54 */ 55restore_usersrs: 56 GET_CPUINFO(%r28) 57 ld %r28,PC_USERSLB(%r28) 58 li %r29, 0 /* Set the counter to zero */ 59 60 slbia 61 slbmfee %r31,%r29 62 clrrdi %r31,%r31,28 63 slbie %r31 641: ld %r31, 0(%r28) /* Load SLB entry pointer */ 65 cmpli 0, %r31, 0 /* If NULL, stop */ 66 beqlr 67 68 ld %r30, 0(%r31) /* Load SLBV */ 69 ld %r31, 8(%r31) /* Load SLBE */ 70 or %r31, %r31, %r29 /* Set SLBE slot */ 71 slbmte %r30, %r31 /* Install SLB entry */ 72 73 addi %r28, %r28, 8 /* Advance pointer */ 74 addi %r29, %r29, 1 75 b 1b /* Repeat */ 76 77/* 78 * Kernel SRs are loaded directly from the PCPU fields 79 */ 80restore_kernsrs: 81 GET_CPUINFO(%r28) 82 addi %r28,%r28,PC_KERNSLB 83 li %r29, 0 /* Set the counter to zero */ 84 85 slbia 86 slbmfee %r31,%r29 87 clrrdi %r31,%r31,28 88 slbie %r31 891: cmpli 0, %r29, USER_SLB_SLOT /* Skip the user slot */ 90 beq- 2f 91 92 ld %r31, 8(%r28) /* Load SLBE */ 93 cmpli 0, %r31, 0 /* If SLBE is not valid, stop */ 94 beqlr 95 ld %r30, 0(%r28) /* Load SLBV */ 96 slbmte %r30, %r31 /* Install SLB entry */ 97 982: addi %r28, %r28, 16 /* Advance pointer */ 99 addi %r29, %r29, 1 100 cmpli 0, %r29, 64 /* Repeat if we are not at the end */ 101 blt 1b 102 blr 103 104/* 105 * FRAME_SETUP assumes: 106 * SPRG1 SP (1) 107 * SPRG3 trap type 108 * savearea r27-r31,DAR,DSISR (DAR & DSISR only for DSI traps) 109 * r28 LR 110 * r29 CR 111 * r30 scratch 112 * r31 scratch 113 * r1 kernel stack 114 * SRR0/1 as at start of trap 115 * 116 * NOTE: SPRG1 is never used while the MMU is on, making it safe to reuse 117 * in any real-mode fault handler, including those handling double faults. 118 */ 119#define FRAME_SETUP(savearea) \ 120/* Have to enable translation to allow access of kernel stack: */ \ 121 GET_CPUINFO(%r31); \ 122 mfsrr0 %r30; \ 123 std %r30,(savearea+CPUSAVE_SRR0)(%r31); /* save SRR0 */ \ 124 mfsrr1 %r30; \ 125 std %r30,(savearea+CPUSAVE_SRR1)(%r31); /* save SRR1 */ \ 126 mfsprg1 %r31; /* get saved SP (clears SPRG1) */ \ 127 mfmsr %r30; \ 128 ori %r30,%r30,(PSL_DR|PSL_IR|PSL_RI)@l; /* relocation on */ \ 129 mtmsr %r30; /* stack can now be accessed */ \ 130 isync; \ 131 stdu %r31,-(FRAMELEN+288)(%r1); /* save it in the callframe */ \ 132 std %r0, FRAME_0+48(%r1); /* save r0 in the trapframe */ \ 133 std %r31,FRAME_1+48(%r1); /* save SP " " */ \ 134 std %r2, FRAME_2+48(%r1); /* save r2 " " */ \ 135 std %r28,FRAME_LR+48(%r1); /* save LR " " */ \ 136 std %r29,FRAME_CR+48(%r1); /* save CR " " */ \ 137 GET_CPUINFO(%r2); \ 138 ld %r27,(savearea+CPUSAVE_R27)(%r2); /* get saved r27 */ \ 139 ld %r28,(savearea+CPUSAVE_R28)(%r2); /* get saved r28 */ \ 140 ld %r29,(savearea+CPUSAVE_R29)(%r2); /* get saved r29 */ \ 141 ld %r30,(savearea+CPUSAVE_R30)(%r2); /* get saved r30 */ \ 142 ld %r31,(savearea+CPUSAVE_R31)(%r2); /* get saved r31 */ \ 143 std %r3, FRAME_3+48(%r1); /* save r3-r31 */ \ 144 std %r4, FRAME_4+48(%r1); \ 145 std %r5, FRAME_5+48(%r1); \ 146 std %r6, FRAME_6+48(%r1); \ 147 std %r7, FRAME_7+48(%r1); \ 148 std %r8, FRAME_8+48(%r1); \ 149 std %r9, FRAME_9+48(%r1); \ 150 std %r10, FRAME_10+48(%r1); \ 151 std %r11, FRAME_11+48(%r1); \ 152 std %r12, FRAME_12+48(%r1); \ 153 std %r13, FRAME_13+48(%r1); \ 154 std %r14, FRAME_14+48(%r1); \ 155 std %r15, FRAME_15+48(%r1); \ 156 std %r16, FRAME_16+48(%r1); \ 157 std %r17, FRAME_17+48(%r1); \ 158 std %r18, FRAME_18+48(%r1); \ 159 std %r19, FRAME_19+48(%r1); \ 160 std %r20, FRAME_20+48(%r1); \ 161 std %r21, FRAME_21+48(%r1); \ 162 std %r22, FRAME_22+48(%r1); \ 163 std %r23, FRAME_23+48(%r1); \ 164 std %r24, FRAME_24+48(%r1); \ 165 std %r25, FRAME_25+48(%r1); \ 166 std %r26, FRAME_26+48(%r1); \ 167 std %r27, FRAME_27+48(%r1); \ 168 std %r28, FRAME_28+48(%r1); \ 169 std %r29, FRAME_29+48(%r1); \ 170 std %r30, FRAME_30+48(%r1); \ 171 std %r31, FRAME_31+48(%r1); \ 172 ld %r28,(savearea+CPUSAVE_AIM_DAR)(%r2); /* saved DAR */ \ 173 ld %r29,(savearea+CPUSAVE_AIM_DSISR)(%r2);/* saved DSISR */\ 174 ld %r30,(savearea+CPUSAVE_SRR0)(%r2); /* saved SRR0 */ \ 175 ld %r31,(savearea+CPUSAVE_SRR1)(%r2); /* saved SRR1 */ \ 176 mfxer %r3; \ 177 mfctr %r4; \ 178 mfsprg3 %r5; \ 179 std %r3, FRAME_XER+48(1); /* save xer/ctr/exc */ \ 180 std %r4, FRAME_CTR+48(1); \ 181 std %r5, FRAME_EXC+48(1); \ 182 std %r28,FRAME_AIM_DAR+48(1); \ 183 std %r29,FRAME_AIM_DSISR+48(1); /* save dsisr/srr0/srr1 */ \ 184 std %r30,FRAME_SRR0+48(1); \ 185 std %r31,FRAME_SRR1+48(1); \ 186 ld %r13,PC_CURTHREAD(%r2) /* set kernel curthread */ 187 188#define FRAME_LEAVE(savearea) \ 189/* Disable exceptions: */ \ 190 mfmsr %r2; \ 191 andi. %r2,%r2,~PSL_EE@l; \ 192 mtmsr %r2; \ 193 isync; \ 194/* Now restore regs: */ \ 195 ld %r2,FRAME_SRR0+48(%r1); \ 196 ld %r3,FRAME_SRR1+48(%r1); \ 197 ld %r4,FRAME_CTR+48(%r1); \ 198 ld %r5,FRAME_XER+48(%r1); \ 199 ld %r6,FRAME_LR+48(%r1); \ 200 GET_CPUINFO(%r7); \ 201 std %r2,(savearea+CPUSAVE_SRR0)(%r7); /* save SRR0 */ \ 202 std %r3,(savearea+CPUSAVE_SRR1)(%r7); /* save SRR1 */ \ 203 ld %r7,FRAME_CR+48(%r1); \ 204 mtctr %r4; \ 205 mtxer %r5; \ 206 mtlr %r6; \ 207 mtsprg2 %r7; /* save cr */ \ 208 ld %r31,FRAME_31+48(%r1); /* restore r0-31 */ \ 209 ld %r30,FRAME_30+48(%r1); \ 210 ld %r29,FRAME_29+48(%r1); \ 211 ld %r28,FRAME_28+48(%r1); \ 212 ld %r27,FRAME_27+48(%r1); \ 213 ld %r26,FRAME_26+48(%r1); \ 214 ld %r25,FRAME_25+48(%r1); \ 215 ld %r24,FRAME_24+48(%r1); \ 216 ld %r23,FRAME_23+48(%r1); \ 217 ld %r22,FRAME_22+48(%r1); \ 218 ld %r21,FRAME_21+48(%r1); \ 219 ld %r20,FRAME_20+48(%r1); \ 220 ld %r19,FRAME_19+48(%r1); \ 221 ld %r18,FRAME_18+48(%r1); \ 222 ld %r17,FRAME_17+48(%r1); \ 223 ld %r16,FRAME_16+48(%r1); \ 224 ld %r15,FRAME_15+48(%r1); \ 225 ld %r14,FRAME_14+48(%r1); \ 226 ld %r13,FRAME_13+48(%r1); \ 227 ld %r12,FRAME_12+48(%r1); \ 228 ld %r11,FRAME_11+48(%r1); \ 229 ld %r10,FRAME_10+48(%r1); \ 230 ld %r9, FRAME_9+48(%r1); \ 231 ld %r8, FRAME_8+48(%r1); \ 232 ld %r7, FRAME_7+48(%r1); \ 233 ld %r6, FRAME_6+48(%r1); \ 234 ld %r5, FRAME_5+48(%r1); \ 235 ld %r4, FRAME_4+48(%r1); \ 236 ld %r3, FRAME_3+48(%r1); \ 237 ld %r2, FRAME_2+48(%r1); \ 238 ld %r0, FRAME_0+48(%r1); \ 239 ld %r1, FRAME_1+48(%r1); \ 240/* Can't touch %r1 from here on */ \ 241 mtsprg3 %r3; /* save r3 */ \ 242/* Disable translation, machine check and recoverability: */ \ 243 mfmsr %r3; \ 244 andi. %r3,%r3,~(PSL_DR|PSL_IR|PSL_ME|PSL_RI)@l; \ 245 mtmsr %r3; \ 246 isync; \ 247/* Decide whether we return to user mode: */ \ 248 GET_CPUINFO(%r3); \ 249 ld %r3,(savearea+CPUSAVE_SRR1)(%r3); \ 250 mtcr %r3; \ 251 bf 17,1f; /* branch if PSL_PR is false */ \ 252/* Restore user SRs */ \ 253 GET_CPUINFO(%r3); \ 254 std %r27,(savearea+CPUSAVE_R27)(%r3); \ 255 std %r28,(savearea+CPUSAVE_R28)(%r3); \ 256 std %r29,(savearea+CPUSAVE_R29)(%r3); \ 257 std %r30,(savearea+CPUSAVE_R30)(%r3); \ 258 std %r31,(savearea+CPUSAVE_R31)(%r3); \ 259 mflr %r27; /* preserve LR */ \ 260 bl restore_usersrs; /* uses r28-r31 */ \ 261 mtlr %r27; \ 262 ld %r31,(savearea+CPUSAVE_R31)(%r3); \ 263 ld %r30,(savearea+CPUSAVE_R30)(%r3); \ 264 ld %r29,(savearea+CPUSAVE_R29)(%r3); \ 265 ld %r28,(savearea+CPUSAVE_R28)(%r3); \ 266 ld %r27,(savearea+CPUSAVE_R27)(%r3); \ 2671: mfsprg2 %r3; /* restore cr */ \ 268 mtcr %r3; \ 269 GET_CPUINFO(%r3); \ 270 ld %r3,(savearea+CPUSAVE_SRR0)(%r3); /* restore srr0 */ \ 271 mtsrr0 %r3; \ 272 GET_CPUINFO(%r3); \ 273 ld %r3,(savearea+CPUSAVE_SRR1)(%r3); /* restore srr1 */ \ 274 mtsrr1 %r3; \ 275 mfsprg3 %r3 /* restore r3 */ 276 277#ifdef KDTRACE_HOOKS 278 .data 279 .globl dtrace_invop_calltrap_addr 280 .align 8 281 .type dtrace_invop_calltrap_addr, @object 282 .size dtrace_invop_calltrap_addr, 8 283dtrace_invop_calltrap_addr: 284 .word 0 285 .word 0 286 287 .text 288#endif 289 290/* 291 * Processor reset exception handler. These are typically 292 * the first instructions the processor executes after a 293 * software reset. We do this in two bits so that we are 294 * not still hanging around in the trap handling region 295 * once the MMU is turned on. 296 */ 297 .globl CNAME(rstcode), CNAME(rstsize) 298CNAME(rstcode): 299 /* Explicitly set MSR[SF] */ 300 mfmsr %r9 301 li %r8,1 302 insrdi %r9,%r8,1,0 303 mtmsrd %r9 304 isync 305 306 ba cpu_reset 307CNAME(rstsize) = . - CNAME(rstcode) 308 309cpu_reset: 310 lis %r1,(tmpstk+TMPSTKSZ-48)@ha /* get new SP */ 311 addi %r1,%r1,(tmpstk+TMPSTKSZ-48)@l 312 313 lis %r3,tocbase@ha 314 ld %r2,tocbase@l(%r3) 315 bl CNAME(cpudep_ap_early_bootstrap) /* Set PCPU */ 316 nop 317 lis %r3,1@l 318 bl CNAME(pmap_cpu_bootstrap) /* Turn on virtual memory */ 319 nop 320 bl CNAME(cpudep_ap_bootstrap) /* Set up PCPU and stack */ 321 nop 322 mr %r1,%r3 /* Use new stack */ 323 bl CNAME(cpudep_ap_setup) 324 nop 325 GET_CPUINFO(%r5) 326 ld %r3,(PC_RESTORE)(%r5) 327 cmpldi %cr0,%r3,0 328 beq %cr0,2f 329 nop 330 li %r4,1 331 b CNAME(longjmp) 332 nop 3332: 334#ifdef SMP 335 bl CNAME(machdep_ap_bootstrap) /* And away! */ 336 nop 337#endif 338 339 /* Should not be reached */ 3409: 341 b 9b 342 343/* 344 * This code gets copied to all the trap vectors 345 * (except ISI/DSI, ALI, and the interrupts) 346 */ 347 348 .globl CNAME(trapcode),CNAME(trapsize) 349CNAME(trapcode): 350 mtsprg1 %r1 /* save SP */ 351 mflr %r1 /* Save the old LR in r1 */ 352 mtsprg2 %r1 /* And then in SPRG2 */ 353 li %r1, 0xA0 /* How to get the vector from LR */ 354 bla generictrap /* LR & SPRG3 is exception # */ 355CNAME(trapsize) = .-CNAME(trapcode) 356 357/* 358 * For SLB misses: do special things for the kernel 359 * 360 * Note: SPRG1 is always safe to overwrite any time the MMU is on, which is 361 * the only time this can be called. 362 */ 363 .globl CNAME(slbtrap),CNAME(slbtrapsize) 364CNAME(slbtrap): 365 mtsprg1 %r1 /* save SP */ 366 GET_CPUINFO(%r1) 367 std %r2,(PC_SLBSAVE+16)(%r1) 368 mfcr %r2 /* save CR */ 369 std %r2,(PC_SLBSAVE+104)(%r1) 370 mfsrr1 %r2 /* test kernel mode */ 371 mtcr %r2 372 bf 17,1f /* branch if PSL_PR is false */ 373 /* User mode */ 374 ld %r2,(PC_SLBSAVE+104)(%r1) /* Restore CR */ 375 mtcr %r2 376 ld %r2,(PC_SLBSAVE+16)(%r1) /* Restore R2 */ 377 mflr %r1 /* Save the old LR in r1 */ 378 mtsprg2 %r1 /* And then in SPRG2 */ 379 li %r1, 0x80 /* How to get the vector from LR */ 380 bla generictrap /* LR & SPRG3 is exception # */ 3811: mflr %r2 /* Save the old LR in r2 */ 382 bla kern_slbtrap 383CNAME(slbtrapsize) = .-CNAME(slbtrap) 384 385kern_slbtrap: 386 std %r2,(PC_SLBSAVE+136)(%r1) /* old LR */ 387 std %r3,(PC_SLBSAVE+24)(%r1) /* save R3 */ 388 389 /* Check if this needs to be handled as a regular trap (userseg miss) */ 390 mflr %r2 391 andi. %r2,%r2,0xff80 392 cmpwi %r2,0x380 393 bne 1f 394 mfdar %r2 395 b 2f 3961: mfsrr0 %r2 3972: /* r2 now contains the fault address */ 398 lis %r3,SEGMENT_MASK@highesta 399 ori %r3,%r3,SEGMENT_MASK@highera 400 sldi %r3,%r3,32 401 oris %r3,%r3,SEGMENT_MASK@ha 402 ori %r3,%r3,SEGMENT_MASK@l 403 and %r2,%r2,%r3 /* R2 = segment base address */ 404 lis %r3,USER_ADDR@highesta 405 ori %r3,%r3,USER_ADDR@highera 406 sldi %r3,%r3,32 407 oris %r3,%r3,USER_ADDR@ha 408 ori %r3,%r3,USER_ADDR@l 409 cmpd %r2,%r3 /* Compare fault base to USER_ADDR */ 410 bne 3f 411 412 /* User seg miss, handle as a regular trap */ 413 ld %r2,(PC_SLBSAVE+104)(%r1) /* Restore CR */ 414 mtcr %r2 415 ld %r2,(PC_SLBSAVE+16)(%r1) /* Restore R2,R3 */ 416 ld %r3,(PC_SLBSAVE+24)(%r1) 417 ld %r1,(PC_SLBSAVE+136)(%r1) /* Save the old LR in r1 */ 418 mtsprg2 %r1 /* And then in SPRG2 */ 419 li %r1, 0x80 /* How to get the vector from LR */ 420 b generictrap /* Retain old LR using b */ 421 4223: /* Real kernel SLB miss */ 423 std %r0,(PC_SLBSAVE+0)(%r1) /* free all volatile regs */ 424 mfsprg1 %r2 /* Old R1 */ 425 std %r2,(PC_SLBSAVE+8)(%r1) 426 /* R2,R3 already saved */ 427 std %r4,(PC_SLBSAVE+32)(%r1) 428 std %r5,(PC_SLBSAVE+40)(%r1) 429 std %r6,(PC_SLBSAVE+48)(%r1) 430 std %r7,(PC_SLBSAVE+56)(%r1) 431 std %r8,(PC_SLBSAVE+64)(%r1) 432 std %r9,(PC_SLBSAVE+72)(%r1) 433 std %r10,(PC_SLBSAVE+80)(%r1) 434 std %r11,(PC_SLBSAVE+88)(%r1) 435 std %r12,(PC_SLBSAVE+96)(%r1) 436 /* CR already saved */ 437 mfxer %r2 /* save XER */ 438 std %r2,(PC_SLBSAVE+112)(%r1) 439 mflr %r2 /* save LR (SP already saved) */ 440 std %r2,(PC_SLBSAVE+120)(%r1) 441 mfctr %r2 /* save CTR */ 442 std %r2,(PC_SLBSAVE+128)(%r1) 443 444 /* Call handler */ 445 addi %r1,%r1,PC_SLBSTACK-48+1024 446 li %r2,~15 447 and %r1,%r1,%r2 448 lis %r3,tocbase@ha 449 ld %r2,tocbase@l(%r3) 450 mflr %r3 451 andi. %r3,%r3,0xff80 452 mfdar %r4 453 mfsrr0 %r5 454 bl handle_kernel_slb_spill 455 nop 456 457 /* Save r28-31, restore r4-r12 */ 458 GET_CPUINFO(%r1) 459 ld %r4,(PC_SLBSAVE+32)(%r1) 460 ld %r5,(PC_SLBSAVE+40)(%r1) 461 ld %r6,(PC_SLBSAVE+48)(%r1) 462 ld %r7,(PC_SLBSAVE+56)(%r1) 463 ld %r8,(PC_SLBSAVE+64)(%r1) 464 ld %r9,(PC_SLBSAVE+72)(%r1) 465 ld %r10,(PC_SLBSAVE+80)(%r1) 466 ld %r11,(PC_SLBSAVE+88)(%r1) 467 ld %r12,(PC_SLBSAVE+96)(%r1) 468 std %r28,(PC_SLBSAVE+64)(%r1) 469 std %r29,(PC_SLBSAVE+72)(%r1) 470 std %r30,(PC_SLBSAVE+80)(%r1) 471 std %r31,(PC_SLBSAVE+88)(%r1) 472 473 /* Restore kernel mapping */ 474 bl restore_kernsrs 475 476 /* Restore remaining registers */ 477 ld %r28,(PC_SLBSAVE+64)(%r1) 478 ld %r29,(PC_SLBSAVE+72)(%r1) 479 ld %r30,(PC_SLBSAVE+80)(%r1) 480 ld %r31,(PC_SLBSAVE+88)(%r1) 481 482 ld %r2,(PC_SLBSAVE+104)(%r1) 483 mtcr %r2 484 ld %r2,(PC_SLBSAVE+112)(%r1) 485 mtxer %r2 486 ld %r2,(PC_SLBSAVE+120)(%r1) 487 mtlr %r2 488 ld %r2,(PC_SLBSAVE+128)(%r1) 489 mtctr %r2 490 ld %r2,(PC_SLBSAVE+136)(%r1) 491 mtlr %r2 492 493 /* Restore r0-r3 */ 494 ld %r0,(PC_SLBSAVE+0)(%r1) 495 ld %r2,(PC_SLBSAVE+16)(%r1) 496 ld %r3,(PC_SLBSAVE+24)(%r1) 497 mfsprg1 %r1 498 499 /* Back to whatever we were doing */ 500 rfid 501 502/* 503 * For ALI: has to save DSISR and DAR 504 */ 505 .globl CNAME(alitrap),CNAME(alisize) 506CNAME(alitrap): 507 mtsprg1 %r1 /* save SP */ 508 GET_CPUINFO(%r1) 509 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */ 510 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 511 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 512 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 513 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 514 mfdar %r30 515 mfdsisr %r31 516 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) 517 std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) 518 mfsprg1 %r1 /* restore SP, in case of branch */ 519 mflr %r28 /* save LR */ 520 mfcr %r29 /* save CR */ 521 522 /* Put our exception vector in SPRG3 */ 523 li %r31, EXC_ALI 524 mtsprg3 %r31 525 526 /* Test whether we already had PR set */ 527 mfsrr1 %r31 528 mtcr %r31 529 bla s_trap 530CNAME(alisize) = .-CNAME(alitrap) 531 532/* 533 * Similar to the above for DSI 534 * Has to handle BAT spills 535 * and standard pagetable spills 536 */ 537 .globl CNAME(dsitrap),CNAME(dsisize) 538CNAME(dsitrap): 539 mtsprg1 %r1 /* save SP */ 540 GET_CPUINFO(%r1) 541 std %r27,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */ 542 std %r28,(PC_DISISAVE+CPUSAVE_R28)(%r1) 543 std %r29,(PC_DISISAVE+CPUSAVE_R29)(%r1) 544 std %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) 545 std %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) 546 mfsprg1 %r1 /* restore SP */ 547 mfcr %r29 /* save CR */ 548 mfxer %r30 /* save XER */ 549 mtsprg2 %r30 /* in SPRG2 */ 550 mfsrr1 %r31 /* test kernel mode */ 551 mtcr %r31 552 mflr %r28 /* save LR (SP already saved) */ 553 bla disitrap 554CNAME(dsisize) = .-CNAME(dsitrap) 555 556/* 557 * Preamble code for DSI/ISI traps 558 */ 559disitrap: 560 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */ 561 mflr %r1 562 andi. %r1,%r1,0xff00 563 mtsprg3 %r1 564 565 GET_CPUINFO(%r1) 566 ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1) 567 std %r31,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) 568 ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1) 569 std %r30,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 570 ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1) 571 std %r31,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 572 ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) 573 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 574 ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) 575 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 576 mfdar %r30 577 mfdsisr %r31 578 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) 579 std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) 580 581#ifdef KDB 582 /* Try to detect a kernel stack overflow */ 583 mfsrr1 %r31 584 mtcr %r31 585 bt 17,realtrap /* branch is user mode */ 586 mfsprg1 %r31 /* get old SP */ 587 clrrdi %r31,%r31,12 /* Round SP down to nearest page */ 588 sub. %r30,%r31,%r30 /* SP - DAR */ 589 bge 1f 590 neg %r30,%r30 /* modulo value */ 5911: cmpldi %cr0,%r30,4096 /* is DAR within a page of SP? */ 592 bge %cr0,realtrap /* no, too far away. */ 593 594 /* Now convert this DSI into a DDB trap. */ 595 GET_CPUINFO(%r1) 596 ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) /* get DAR */ 597 std %r30,(PC_DBSAVE +CPUSAVE_AIM_DAR)(%r1) /* save DAR */ 598 ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) /* get DSISR */ 599 std %r30,(PC_DBSAVE +CPUSAVE_AIM_DSISR)(%r1) /* save DSISR */ 600 ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* get r27 */ 601 std %r31,(PC_DBSAVE +CPUSAVE_R27)(%r1) /* save r27 */ 602 ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1) /* get r28 */ 603 std %r30,(PC_DBSAVE +CPUSAVE_R28)(%r1) /* save r28 */ 604 ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1) /* get r29 */ 605 std %r31,(PC_DBSAVE +CPUSAVE_R29)(%r1) /* save r29 */ 606 ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) /* get r30 */ 607 std %r30,(PC_DBSAVE +CPUSAVE_R30)(%r1) /* save r30 */ 608 ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) /* get r31 */ 609 std %r31,(PC_DBSAVE +CPUSAVE_R31)(%r1) /* save r31 */ 610 b dbtrap 611#endif 612 613 /* XXX need stack probe here */ 614realtrap: 615/* Test whether we already had PR set */ 616 mfsrr1 %r1 617 mtcr %r1 618 mfsprg1 %r1 /* restore SP (might have been 619 overwritten) */ 620 bf 17,k_trap /* branch if PSL_PR is false */ 621 GET_CPUINFO(%r1) 622 ld %r1,PC_CURPCB(%r1) 623 mr %r27,%r28 /* Save LR, r29 */ 624 mtsprg2 %r29 625 bl restore_kernsrs /* enable kernel mapping */ 626 mfsprg2 %r29 627 mr %r28,%r27 628 ba s_trap 629 630/* 631 * generictrap does some standard setup for trap handling to minimize 632 * the code that need be installed in the actual vectors. It expects 633 * the following conditions. 634 * 635 * R1 - Trap vector = LR & (0xff00 | R1) 636 * SPRG1 - Original R1 contents 637 * SPRG2 - Original LR 638 */ 639 640generictrap: 641 /* Save R1 for computing the exception vector */ 642 mtsprg3 %r1 643 644 /* Save interesting registers */ 645 GET_CPUINFO(%r1) 646 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */ 647 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 648 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 649 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 650 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 651 mfdar %r30 652 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) 653 mfsprg1 %r1 /* restore SP, in case of branch */ 654 mfsprg2 %r28 /* save LR */ 655 mfcr %r29 /* save CR */ 656 657 /* Compute the exception vector from the link register */ 658 mfsprg3 %r31 659 ori %r31,%r31,0xff00 660 mflr %r30 661 and %r30,%r30,%r31 662 mtsprg3 %r30 663 664 /* Test whether we already had PR set */ 665 mfsrr1 %r31 666 mtcr %r31 667 668s_trap: 669 bf 17,k_trap /* branch if PSL_PR is false */ 670 GET_CPUINFO(%r1) 671u_trap: 672 ld %r1,PC_CURPCB(%r1) 673 mr %r27,%r28 /* Save LR, r29 */ 674 mtsprg2 %r29 675 bl restore_kernsrs /* enable kernel mapping */ 676 mfsprg2 %r29 677 mr %r28,%r27 678 679/* 680 * Now the common trap catching code. 681 */ 682k_trap: 683 FRAME_SETUP(PC_TEMPSAVE) 684/* Call C interrupt dispatcher: */ 685trapagain: 686 lis %r3,tocbase@ha 687 ld %r2,tocbase@l(%r3) 688 addi %r3,%r1,48 689 bl CNAME(powerpc_interrupt) 690 nop 691 692 .globl CNAME(trapexit) /* backtrace code sentinel */ 693CNAME(trapexit): 694/* Disable interrupts: */ 695 mfmsr %r3 696 andi. %r3,%r3,~PSL_EE@l 697 mtmsr %r3 698 isync 699/* Test AST pending: */ 700 ld %r5,FRAME_SRR1+48(%r1) 701 mtcr %r5 702 bf 17,1f /* branch if PSL_PR is false */ 703 704 GET_CPUINFO(%r3) /* get per-CPU pointer */ 705 lwz %r4, TD_FLAGS(%r13) /* get thread flags value */ 706 lis %r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@h 707 ori %r5,%r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@l 708 and. %r4,%r4,%r5 709 beq 1f 710 mfmsr %r3 /* re-enable interrupts */ 711 ori %r3,%r3,PSL_EE@l 712 mtmsr %r3 713 isync 714 lis %r3,tocbase@ha 715 ld %r2,tocbase@l(%r3) 716 addi %r3,%r1,48 717 bl CNAME(ast) 718 nop 719 .globl CNAME(asttrapexit) /* backtrace code sentinel #2 */ 720CNAME(asttrapexit): 721 b trapexit /* test ast ret value ? */ 7221: 723 FRAME_LEAVE(PC_TEMPSAVE) 724 rfid 725 726#if defined(KDB) 727/* 728 * Deliberate entry to dbtrap 729 */ 730ASENTRY_NOPROF(breakpoint) 731 mtsprg1 %r1 732 mfmsr %r3 733 mtsrr1 %r3 734 andi. %r3,%r3,~(PSL_EE|PSL_ME)@l 735 mtmsr %r3 /* disable interrupts */ 736 isync 737 GET_CPUINFO(%r3) 738 std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r3) 739 std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r3) 740 std %r29,(PC_DBSAVE+CPUSAVE_R29)(%r3) 741 std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r3) 742 std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r3) 743 mflr %r28 744 li %r29,EXC_BPT 745 mtlr %r29 746 mfcr %r29 747 mtsrr0 %r28 748 749/* 750 * Now the kdb trap catching code. 751 */ 752dbtrap: 753 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */ 754 mflr %r1 755 andi. %r1,%r1,0xff00 756 mtsprg3 %r1 757 758 lis %r1,(tmpstk+TMPSTKSZ-48)@ha /* get new SP */ 759 addi %r1,%r1,(tmpstk+TMPSTKSZ-48)@l 760 761 FRAME_SETUP(PC_DBSAVE) 762/* Call C trap code: */ 763 lis %r3,tocbase@ha 764 ld %r2,tocbase@l(%r3) 765 addi %r3,%r1,48 766 bl CNAME(db_trap_glue) 767 nop 768 or. %r3,%r3,%r3 769 bne dbleave 770/* This wasn't for KDB, so switch to real trap: */ 771 ld %r3,FRAME_EXC+48(%r1) /* save exception */ 772 GET_CPUINFO(%r4) 773 std %r3,(PC_DBSAVE+CPUSAVE_R31)(%r4) 774 FRAME_LEAVE(PC_DBSAVE) 775 mtsprg1 %r1 /* prepare for entrance to realtrap */ 776 GET_CPUINFO(%r1) 777 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) 778 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) 779 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1) 780 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1) 781 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1) 782 mflr %r28 783 mfcr %r29 784 ld %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1) 785 mtsprg3 %r31 /* SPRG3 was clobbered by FRAME_LEAVE */ 786 mfsprg1 %r1 787 b realtrap 788dbleave: 789 FRAME_LEAVE(PC_DBSAVE) 790 rfid 791 792/* 793 * In case of KDB we want a separate trap catcher for it 794 */ 795 .globl CNAME(dblow),CNAME(dbsize) 796CNAME(dblow): 797 mtsprg1 %r1 /* save SP */ 798 mtsprg2 %r29 /* save r29 */ 799 mfcr %r29 /* save CR in r29 */ 800 mfsrr1 %r1 801 mtcr %r1 802 bf 17,1f /* branch if privileged */ 803 804 /* Unprivileged case */ 805 mtcr %r29 /* put the condition register back */ 806 mfsprg2 %r29 /* ... and r29 */ 807 mflr %r1 /* save LR */ 808 mtsprg2 %r1 /* And then in SPRG2 */ 809 li %r1, 0 /* How to get the vector from LR */ 810 811 bla generictrap /* and we look like a generic trap */ 8121: 813 GET_CPUINFO(%r1) 814 std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r1) /* free r27 */ 815 std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r1) /* free r28 */ 816 mfsprg2 %r28 /* r29 holds cr... */ 817 std %r28,(PC_DBSAVE+CPUSAVE_R29)(%r1) /* free r29 */ 818 std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r1) /* free r30 */ 819 std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1) /* free r31 */ 820 mflr %r28 /* save LR */ 821 bla dbtrap 822CNAME(dbsize) = .-CNAME(dblow) 823#endif /* KDB */ 824