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1da177e4 LT |
1 | /* |
2 | * Linux/PA-RISC Project (http://www.parisc-linux.org/) | |
3 | * | |
4 | * kernel entry points (interruptions, system call wrappers) | |
5 | * Copyright (C) 1999,2000 Philipp Rumpf | |
6 | * Copyright (C) 1999 SuSE GmbH Nuernberg | |
7 | * Copyright (C) 2000 Hewlett-Packard (John Marvin) | |
8 | * Copyright (C) 1999 Hewlett-Packard (Frank Rowand) | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2, or (at your option) | |
13 | * any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | */ | |
24 | ||
0013a854 | 25 | #include <asm/asm-offsets.h> |
1da177e4 LT |
26 | |
27 | /* we have the following possibilities to act on an interruption: | |
28 | * - handle in assembly and use shadowed registers only | |
29 | * - save registers to kernel stack and handle in assembly or C */ | |
30 | ||
31 | ||
896a3756 | 32 | #include <asm/psw.h> |
3d73cf5e | 33 | #include <asm/cache.h> /* for L1_CACHE_SHIFT */ |
1da177e4 LT |
34 | #include <asm/assembly.h> /* for LDREG/STREG defines */ |
35 | #include <asm/pgtable.h> | |
1da177e4 LT |
36 | #include <asm/signal.h> |
37 | #include <asm/unistd.h> | |
38 | #include <asm/thread_info.h> | |
39 | ||
c5e76552 HD |
40 | #include <linux/linkage.h> |
41 | ||
413059f2 | 42 | #ifdef CONFIG_64BIT |
1da177e4 LT |
43 | .level 2.0w |
44 | #else | |
1da177e4 LT |
45 | .level 2.0 |
46 | #endif | |
47 | ||
48 | .import pa_dbit_lock,data | |
49 | ||
50 | /* space_to_prot macro creates a prot id from a space id */ | |
51 | ||
52 | #if (SPACEID_SHIFT) == 0 | |
53 | .macro space_to_prot spc prot | |
54 | depd,z \spc,62,31,\prot | |
55 | .endm | |
56 | #else | |
57 | .macro space_to_prot spc prot | |
58 | extrd,u \spc,(64 - (SPACEID_SHIFT)),32,\prot | |
59 | .endm | |
60 | #endif | |
61 | ||
62 | /* Switch to virtual mapping, trashing only %r1 */ | |
63 | .macro virt_map | |
896a3756 GG |
64 | /* pcxt_ssm_bug */ |
65 | rsm PSW_SM_I, %r0 /* barrier for "Relied upon Translation */ | |
1da177e4 LT |
66 | mtsp %r0, %sr4 |
67 | mtsp %r0, %sr5 | |
896a3756 GG |
68 | mfsp %sr7, %r1 |
69 | or,= %r0,%r1,%r0 /* Only save sr7 in sr3 if sr7 != 0 */ | |
70 | mtsp %r1, %sr3 | |
71 | tovirt_r1 %r29 | |
72 | load32 KERNEL_PSW, %r1 | |
73 | ||
74 | rsm PSW_SM_QUIET,%r0 /* second "heavy weight" ctl op */ | |
1da177e4 LT |
75 | mtsp %r0, %sr6 |
76 | mtsp %r0, %sr7 | |
1da177e4 LT |
77 | mtctl %r0, %cr17 /* Clear IIASQ tail */ |
78 | mtctl %r0, %cr17 /* Clear IIASQ head */ | |
896a3756 | 79 | mtctl %r1, %ipsw |
1da177e4 LT |
80 | load32 4f, %r1 |
81 | mtctl %r1, %cr18 /* Set IIAOQ tail */ | |
82 | ldo 4(%r1), %r1 | |
83 | mtctl %r1, %cr18 /* Set IIAOQ head */ | |
84 | rfir | |
85 | nop | |
86 | 4: | |
87 | .endm | |
88 | ||
89 | /* | |
90 | * The "get_stack" macros are responsible for determining the | |
91 | * kernel stack value. | |
92 | * | |
1da177e4 LT |
93 | * If sr7 == 0 |
94 | * Already using a kernel stack, so call the | |
95 | * get_stack_use_r30 macro to push a pt_regs structure | |
96 | * on the stack, and store registers there. | |
97 | * else | |
98 | * Need to set up a kernel stack, so call the | |
99 | * get_stack_use_cr30 macro to set up a pointer | |
100 | * to the pt_regs structure contained within the | |
101 | * task pointer pointed to by cr30. Set the stack | |
102 | * pointer to point to the end of the task structure. | |
103 | * | |
1da177e4 LT |
104 | * Note that we use shadowed registers for temps until |
105 | * we can save %r26 and %r29. %r26 is used to preserve | |
106 | * %r8 (a shadowed register) which temporarily contained | |
107 | * either the fault type ("code") or the eirr. We need | |
108 | * to use a non-shadowed register to carry the value over | |
109 | * the rfir in virt_map. We use %r26 since this value winds | |
110 | * up being passed as the argument to either do_cpu_irq_mask | |
111 | * or handle_interruption. %r29 is used to hold a pointer | |
112 | * the register save area, and once again, it needs to | |
113 | * be a non-shadowed register so that it survives the rfir. | |
114 | * | |
115 | * N.B. TASK_SZ_ALGN and PT_SZ_ALGN include space for a stack frame. | |
116 | */ | |
117 | ||
118 | .macro get_stack_use_cr30 | |
119 | ||
120 | /* we save the registers in the task struct */ | |
121 | ||
122 | mfctl %cr30, %r1 | |
123 | tophys %r1,%r9 | |
124 | LDREG TI_TASK(%r9), %r1 /* thread_info -> task_struct */ | |
125 | tophys %r1,%r9 | |
126 | ldo TASK_REGS(%r9),%r9 | |
127 | STREG %r30, PT_GR30(%r9) | |
128 | STREG %r29,PT_GR29(%r9) | |
129 | STREG %r26,PT_GR26(%r9) | |
130 | copy %r9,%r29 | |
131 | mfctl %cr30, %r1 | |
132 | ldo THREAD_SZ_ALGN(%r1), %r30 | |
133 | .endm | |
134 | ||
135 | .macro get_stack_use_r30 | |
136 | ||
137 | /* we put a struct pt_regs on the stack and save the registers there */ | |
138 | ||
139 | tophys %r30,%r9 | |
140 | STREG %r30,PT_GR30(%r9) | |
141 | ldo PT_SZ_ALGN(%r30),%r30 | |
142 | STREG %r29,PT_GR29(%r9) | |
143 | STREG %r26,PT_GR26(%r9) | |
144 | copy %r9,%r29 | |
145 | .endm | |
146 | ||
147 | .macro rest_stack | |
148 | LDREG PT_GR1(%r29), %r1 | |
149 | LDREG PT_GR30(%r29),%r30 | |
150 | LDREG PT_GR29(%r29),%r29 | |
151 | .endm | |
152 | ||
153 | /* default interruption handler | |
154 | * (calls traps.c:handle_interruption) */ | |
155 | .macro def code | |
156 | b intr_save | |
157 | ldi \code, %r8 | |
158 | .align 32 | |
159 | .endm | |
160 | ||
161 | /* Interrupt interruption handler | |
162 | * (calls irq.c:do_cpu_irq_mask) */ | |
163 | .macro extint code | |
164 | b intr_extint | |
165 | mfsp %sr7,%r16 | |
166 | .align 32 | |
167 | .endm | |
168 | ||
169 | .import os_hpmc, code | |
170 | ||
171 | /* HPMC handler */ | |
172 | .macro hpmc code | |
173 | nop /* must be a NOP, will be patched later */ | |
174 | load32 PA(os_hpmc), %r3 | |
175 | bv,n 0(%r3) | |
176 | nop | |
177 | .word 0 /* checksum (will be patched) */ | |
178 | .word PA(os_hpmc) /* address of handler */ | |
179 | .word 0 /* length of handler */ | |
180 | .endm | |
181 | ||
182 | /* | |
183 | * Performance Note: Instructions will be moved up into | |
184 | * this part of the code later on, once we are sure | |
185 | * that the tlb miss handlers are close to final form. | |
186 | */ | |
187 | ||
188 | /* Register definitions for tlb miss handler macros */ | |
189 | ||
190 | va = r8 /* virtual address for which the trap occured */ | |
191 | spc = r24 /* space for which the trap occured */ | |
192 | ||
413059f2 | 193 | #ifndef CONFIG_64BIT |
1da177e4 LT |
194 | |
195 | /* | |
196 | * itlb miss interruption handler (parisc 1.1 - 32 bit) | |
197 | */ | |
198 | ||
199 | .macro itlb_11 code | |
200 | ||
201 | mfctl %pcsq, spc | |
202 | b itlb_miss_11 | |
203 | mfctl %pcoq, va | |
204 | ||
205 | .align 32 | |
206 | .endm | |
207 | #endif | |
208 | ||
209 | /* | |
210 | * itlb miss interruption handler (parisc 2.0) | |
211 | */ | |
212 | ||
213 | .macro itlb_20 code | |
214 | mfctl %pcsq, spc | |
413059f2 | 215 | #ifdef CONFIG_64BIT |
1da177e4 LT |
216 | b itlb_miss_20w |
217 | #else | |
218 | b itlb_miss_20 | |
219 | #endif | |
220 | mfctl %pcoq, va | |
221 | ||
222 | .align 32 | |
223 | .endm | |
224 | ||
413059f2 | 225 | #ifndef CONFIG_64BIT |
1da177e4 LT |
226 | /* |
227 | * naitlb miss interruption handler (parisc 1.1 - 32 bit) | |
228 | * | |
229 | * Note: naitlb misses will be treated | |
230 | * as an ordinary itlb miss for now. | |
231 | * However, note that naitlb misses | |
232 | * have the faulting address in the | |
233 | * IOR/ISR. | |
234 | */ | |
235 | ||
236 | .macro naitlb_11 code | |
237 | ||
238 | mfctl %isr,spc | |
239 | b itlb_miss_11 | |
240 | mfctl %ior,va | |
241 | /* FIXME: If user causes a naitlb miss, the priv level may not be in | |
242 | * lower bits of va, where the itlb miss handler is expecting them | |
243 | */ | |
244 | ||
245 | .align 32 | |
246 | .endm | |
247 | #endif | |
248 | ||
249 | /* | |
250 | * naitlb miss interruption handler (parisc 2.0) | |
251 | * | |
252 | * Note: naitlb misses will be treated | |
253 | * as an ordinary itlb miss for now. | |
254 | * However, note that naitlb misses | |
255 | * have the faulting address in the | |
256 | * IOR/ISR. | |
257 | */ | |
258 | ||
259 | .macro naitlb_20 code | |
260 | ||
261 | mfctl %isr,spc | |
413059f2 | 262 | #ifdef CONFIG_64BIT |
1da177e4 LT |
263 | b itlb_miss_20w |
264 | #else | |
265 | b itlb_miss_20 | |
266 | #endif | |
267 | mfctl %ior,va | |
268 | /* FIXME: If user causes a naitlb miss, the priv level may not be in | |
269 | * lower bits of va, where the itlb miss handler is expecting them | |
270 | */ | |
271 | ||
272 | .align 32 | |
273 | .endm | |
274 | ||
413059f2 | 275 | #ifndef CONFIG_64BIT |
1da177e4 LT |
276 | /* |
277 | * dtlb miss interruption handler (parisc 1.1 - 32 bit) | |
278 | */ | |
279 | ||
280 | .macro dtlb_11 code | |
281 | ||
282 | mfctl %isr, spc | |
283 | b dtlb_miss_11 | |
284 | mfctl %ior, va | |
285 | ||
286 | .align 32 | |
287 | .endm | |
288 | #endif | |
289 | ||
290 | /* | |
291 | * dtlb miss interruption handler (parisc 2.0) | |
292 | */ | |
293 | ||
294 | .macro dtlb_20 code | |
295 | ||
296 | mfctl %isr, spc | |
413059f2 | 297 | #ifdef CONFIG_64BIT |
1da177e4 LT |
298 | b dtlb_miss_20w |
299 | #else | |
300 | b dtlb_miss_20 | |
301 | #endif | |
302 | mfctl %ior, va | |
303 | ||
304 | .align 32 | |
305 | .endm | |
306 | ||
413059f2 | 307 | #ifndef CONFIG_64BIT |
1da177e4 LT |
308 | /* nadtlb miss interruption handler (parisc 1.1 - 32 bit) */ |
309 | ||
310 | .macro nadtlb_11 code | |
311 | ||
312 | mfctl %isr,spc | |
313 | b nadtlb_miss_11 | |
314 | mfctl %ior,va | |
315 | ||
316 | .align 32 | |
317 | .endm | |
318 | #endif | |
319 | ||
320 | /* nadtlb miss interruption handler (parisc 2.0) */ | |
321 | ||
322 | .macro nadtlb_20 code | |
323 | ||
324 | mfctl %isr,spc | |
413059f2 | 325 | #ifdef CONFIG_64BIT |
1da177e4 LT |
326 | b nadtlb_miss_20w |
327 | #else | |
328 | b nadtlb_miss_20 | |
329 | #endif | |
330 | mfctl %ior,va | |
331 | ||
332 | .align 32 | |
333 | .endm | |
334 | ||
413059f2 | 335 | #ifndef CONFIG_64BIT |
1da177e4 LT |
336 | /* |
337 | * dirty bit trap interruption handler (parisc 1.1 - 32 bit) | |
338 | */ | |
339 | ||
340 | .macro dbit_11 code | |
341 | ||
342 | mfctl %isr,spc | |
343 | b dbit_trap_11 | |
344 | mfctl %ior,va | |
345 | ||
346 | .align 32 | |
347 | .endm | |
348 | #endif | |
349 | ||
350 | /* | |
351 | * dirty bit trap interruption handler (parisc 2.0) | |
352 | */ | |
353 | ||
354 | .macro dbit_20 code | |
355 | ||
356 | mfctl %isr,spc | |
413059f2 | 357 | #ifdef CONFIG_64BIT |
1da177e4 LT |
358 | b dbit_trap_20w |
359 | #else | |
360 | b dbit_trap_20 | |
361 | #endif | |
362 | mfctl %ior,va | |
363 | ||
364 | .align 32 | |
365 | .endm | |
366 | ||
1da177e4 LT |
367 | /* In LP64, the space contains part of the upper 32 bits of the |
368 | * fault. We have to extract this and place it in the va, | |
369 | * zeroing the corresponding bits in the space register */ | |
370 | .macro space_adjust spc,va,tmp | |
413059f2 | 371 | #ifdef CONFIG_64BIT |
1da177e4 LT |
372 | extrd,u \spc,63,SPACEID_SHIFT,\tmp |
373 | depd %r0,63,SPACEID_SHIFT,\spc | |
374 | depd \tmp,31,SPACEID_SHIFT,\va | |
375 | #endif | |
376 | .endm | |
377 | ||
378 | .import swapper_pg_dir,code | |
379 | ||
380 | /* Get the pgd. For faults on space zero (kernel space), this | |
381 | * is simply swapper_pg_dir. For user space faults, the | |
382 | * pgd is stored in %cr25 */ | |
383 | .macro get_pgd spc,reg | |
384 | ldil L%PA(swapper_pg_dir),\reg | |
385 | ldo R%PA(swapper_pg_dir)(\reg),\reg | |
386 | or,COND(=) %r0,\spc,%r0 | |
387 | mfctl %cr25,\reg | |
388 | .endm | |
389 | ||
390 | /* | |
391 | space_check(spc,tmp,fault) | |
392 | ||
393 | spc - The space we saw the fault with. | |
394 | tmp - The place to store the current space. | |
395 | fault - Function to call on failure. | |
396 | ||
397 | Only allow faults on different spaces from the | |
398 | currently active one if we're the kernel | |
399 | ||
400 | */ | |
401 | .macro space_check spc,tmp,fault | |
402 | mfsp %sr7,\tmp | |
403 | or,COND(<>) %r0,\spc,%r0 /* user may execute gateway page | |
404 | * as kernel, so defeat the space | |
405 | * check if it is */ | |
406 | copy \spc,\tmp | |
407 | or,COND(=) %r0,\tmp,%r0 /* nullify if executing as kernel */ | |
408 | cmpb,COND(<>),n \tmp,\spc,\fault | |
409 | .endm | |
410 | ||
411 | /* Look up a PTE in a 2-Level scheme (faulting at each | |
412 | * level if the entry isn't present | |
413 | * | |
414 | * NOTE: we use ldw even for LP64, since the short pointers | |
415 | * can address up to 1TB | |
416 | */ | |
417 | .macro L2_ptep pmd,pte,index,va,fault | |
418 | #if PT_NLEVELS == 3 | |
9b437bca | 419 | extru \va,31-ASM_PMD_SHIFT,ASM_BITS_PER_PMD,\index |
1da177e4 | 420 | #else |
9b437bca | 421 | extru \va,31-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index |
1da177e4 | 422 | #endif |
9b437bca | 423 | dep %r0,31,PAGE_SHIFT,\pmd /* clear offset */ |
1da177e4 LT |
424 | copy %r0,\pte |
425 | ldw,s \index(\pmd),\pmd | |
426 | bb,>=,n \pmd,_PxD_PRESENT_BIT,\fault | |
9b437bca | 427 | dep %r0,31,PxD_FLAG_SHIFT,\pmd /* clear flags */ |
1da177e4 | 428 | copy \pmd,%r9 |
3d73cf5e | 429 | SHLREG %r9,PxD_VALUE_SHIFT,\pmd |
9b437bca JDA |
430 | extru \va,31-PAGE_SHIFT,ASM_BITS_PER_PTE,\index |
431 | dep %r0,31,PAGE_SHIFT,\pmd /* clear offset */ | |
1da177e4 LT |
432 | shladd \index,BITS_PER_PTE_ENTRY,\pmd,\pmd |
433 | LDREG %r0(\pmd),\pte /* pmd is now pte */ | |
434 | bb,>=,n \pte,_PAGE_PRESENT_BIT,\fault | |
435 | .endm | |
436 | ||
437 | /* Look up PTE in a 3-Level scheme. | |
438 | * | |
439 | * Here we implement a Hybrid L2/L3 scheme: we allocate the | |
440 | * first pmd adjacent to the pgd. This means that we can | |
441 | * subtract a constant offset to get to it. The pmd and pgd | |
442 | * sizes are arranged so that a single pmd covers 4GB (giving | |
443 | * a full LP64 process access to 8TB) so our lookups are | |
444 | * effectively L2 for the first 4GB of the kernel (i.e. for | |
445 | * all ILP32 processes and all the kernel for machines with | |
446 | * under 4GB of memory) */ | |
447 | .macro L3_ptep pgd,pte,index,va,fault | |
2fd83038 | 448 | #if PT_NLEVELS == 3 /* we might have a 2-Level scheme, e.g. with 16kb page size */ |
1da177e4 LT |
449 | extrd,u \va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index |
450 | copy %r0,\pte | |
2fd83038 | 451 | extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0 |
1da177e4 | 452 | ldw,s \index(\pgd),\pgd |
2fd83038 | 453 | extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0 |
1da177e4 | 454 | bb,>=,n \pgd,_PxD_PRESENT_BIT,\fault |
2fd83038 | 455 | extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0 |
1da177e4 | 456 | shld \pgd,PxD_VALUE_SHIFT,\index |
2fd83038 | 457 | extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0 |
1da177e4 | 458 | copy \index,\pgd |
2fd83038 | 459 | extrd,u,*<> \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0 |
1da177e4 | 460 | ldo ASM_PGD_PMD_OFFSET(\pgd),\pgd |
2fd83038 | 461 | #endif |
1da177e4 LT |
462 | L2_ptep \pgd,\pte,\index,\va,\fault |
463 | .endm | |
464 | ||
465 | /* Set the _PAGE_ACCESSED bit of the PTE. Be clever and | |
466 | * don't needlessly dirty the cache line if it was already set */ | |
467 | .macro update_ptep ptep,pte,tmp,tmp1 | |
468 | ldi _PAGE_ACCESSED,\tmp1 | |
469 | or \tmp1,\pte,\tmp | |
470 | and,COND(<>) \tmp1,\pte,%r0 | |
471 | STREG \tmp,0(\ptep) | |
472 | .endm | |
473 | ||
474 | /* Set the dirty bit (and accessed bit). No need to be | |
475 | * clever, this is only used from the dirty fault */ | |
476 | .macro update_dirty ptep,pte,tmp | |
477 | ldi _PAGE_ACCESSED|_PAGE_DIRTY,\tmp | |
478 | or \tmp,\pte,\pte | |
479 | STREG \pte,0(\ptep) | |
480 | .endm | |
481 | ||
afca2523 HD |
482 | /* bitshift difference between a PFN (based on kernel's PAGE_SIZE) |
483 | * to a CPU TLB 4k PFN (4k => 12 bits to shift) */ | |
484 | #define PAGE_ADD_SHIFT (PAGE_SHIFT-12) | |
485 | ||
486 | /* Drop prot bits and convert to page addr for iitlbt and idtlbt */ | |
487 | .macro convert_for_tlb_insert20 pte | |
488 | extrd,u \pte,(63-ASM_PFN_PTE_SHIFT)+(63-58)+PAGE_ADD_SHIFT,\ | |
489 | 64-PAGE_SHIFT-PAGE_ADD_SHIFT,\pte | |
490 | depdi _PAGE_SIZE_ENCODING_DEFAULT,63,\ | |
491 | (63-58)+PAGE_ADD_SHIFT,\pte | |
492 | .endm | |
493 | ||
1da177e4 LT |
494 | /* Convert the pte and prot to tlb insertion values. How |
495 | * this happens is quite subtle, read below */ | |
496 | .macro make_insert_tlb spc,pte,prot | |
497 | space_to_prot \spc \prot /* create prot id from space */ | |
498 | /* The following is the real subtlety. This is depositing | |
499 | * T <-> _PAGE_REFTRAP | |
500 | * D <-> _PAGE_DIRTY | |
501 | * B <-> _PAGE_DMB (memory break) | |
502 | * | |
503 | * Then incredible subtlety: The access rights are | |
504 | * _PAGE_GATEWAY _PAGE_EXEC _PAGE_READ | |
505 | * See 3-14 of the parisc 2.0 manual | |
506 | * | |
507 | * Finally, _PAGE_READ goes in the top bit of PL1 (so we | |
508 | * trigger an access rights trap in user space if the user | |
509 | * tries to read an unreadable page */ | |
510 | depd \pte,8,7,\prot | |
511 | ||
512 | /* PAGE_USER indicates the page can be read with user privileges, | |
513 | * so deposit X1|11 to PL1|PL2 (remember the upper bit of PL1 | |
514 | * contains _PAGE_READ */ | |
515 | extrd,u,*= \pte,_PAGE_USER_BIT+32,1,%r0 | |
516 | depdi 7,11,3,\prot | |
517 | /* If we're a gateway page, drop PL2 back to zero for promotion | |
518 | * to kernel privilege (so we can execute the page as kernel). | |
519 | * Any privilege promotion page always denys read and write */ | |
520 | extrd,u,*= \pte,_PAGE_GATEWAY_BIT+32,1,%r0 | |
521 | depd %r0,11,2,\prot /* If Gateway, Set PL2 to 0 */ | |
522 | ||
2fd83038 HD |
523 | /* Enforce uncacheable pages. |
524 | * This should ONLY be use for MMIO on PA 2.0 machines. | |
525 | * Memory/DMA is cache coherent on all PA2.0 machines we support | |
526 | * (that means T-class is NOT supported) and the memory controllers | |
527 | * on most of those machines only handles cache transactions. | |
528 | */ | |
529 | extrd,u,*= \pte,_PAGE_NO_CACHE_BIT+32,1,%r0 | |
2678251b | 530 | depdi 1,12,1,\prot |
1da177e4 | 531 | |
2fd83038 | 532 | /* Drop prot bits and convert to page addr for iitlbt and idtlbt */ |
afca2523 | 533 | convert_for_tlb_insert20 \pte |
1da177e4 LT |
534 | .endm |
535 | ||
536 | /* Identical macro to make_insert_tlb above, except it | |
537 | * makes the tlb entry for the differently formatted pa11 | |
538 | * insertion instructions */ | |
539 | .macro make_insert_tlb_11 spc,pte,prot | |
540 | zdep \spc,30,15,\prot | |
541 | dep \pte,8,7,\prot | |
542 | extru,= \pte,_PAGE_NO_CACHE_BIT,1,%r0 | |
543 | depi 1,12,1,\prot | |
544 | extru,= \pte,_PAGE_USER_BIT,1,%r0 | |
545 | depi 7,11,3,\prot /* Set for user space (1 rsvd for read) */ | |
546 | extru,= \pte,_PAGE_GATEWAY_BIT,1,%r0 | |
547 | depi 0,11,2,\prot /* If Gateway, Set PL2 to 0 */ | |
548 | ||
549 | /* Get rid of prot bits and convert to page addr for iitlba */ | |
550 | ||
1152a68c HD |
551 | depi 0,31,ASM_PFN_PTE_SHIFT,\pte |
552 | SHRREG \pte,(ASM_PFN_PTE_SHIFT-(31-26)),\pte | |
1da177e4 LT |
553 | .endm |
554 | ||
555 | /* This is for ILP32 PA2.0 only. The TLB insertion needs | |
556 | * to extend into I/O space if the address is 0xfXXXXXXX | |
557 | * so we extend the f's into the top word of the pte in | |
558 | * this case */ | |
559 | .macro f_extend pte,tmp | |
560 | extrd,s \pte,42,4,\tmp | |
561 | addi,<> 1,\tmp,%r0 | |
562 | extrd,s \pte,63,25,\pte | |
563 | .endm | |
564 | ||
565 | /* The alias region is an 8MB aligned 16MB to do clear and | |
566 | * copy user pages at addresses congruent with the user | |
567 | * virtual address. | |
568 | * | |
569 | * To use the alias page, you set %r26 up with the to TLB | |
570 | * entry (identifying the physical page) and %r23 up with | |
571 | * the from tlb entry (or nothing if only a to entry---for | |
572 | * clear_user_page_asm) */ | |
573 | .macro do_alias spc,tmp,tmp1,va,pte,prot,fault | |
574 | cmpib,COND(<>),n 0,\spc,\fault | |
575 | ldil L%(TMPALIAS_MAP_START),\tmp | |
413059f2 | 576 | #if defined(CONFIG_64BIT) && (TMPALIAS_MAP_START >= 0x80000000) |
1da177e4 LT |
577 | /* on LP64, ldi will sign extend into the upper 32 bits, |
578 | * which is behaviour we don't want */ | |
579 | depdi 0,31,32,\tmp | |
580 | #endif | |
581 | copy \va,\tmp1 | |
9b437bca | 582 | depi 0,31,23,\tmp1 |
1da177e4 LT |
583 | cmpb,COND(<>),n \tmp,\tmp1,\fault |
584 | ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),\prot | |
585 | depd,z \prot,8,7,\prot | |
586 | /* | |
587 | * OK, it is in the temp alias region, check whether "from" or "to". | |
588 | * Check "subtle" note in pacache.S re: r23/r26. | |
589 | */ | |
413059f2 | 590 | #ifdef CONFIG_64BIT |
1da177e4 LT |
591 | extrd,u,*= \va,41,1,%r0 |
592 | #else | |
593 | extrw,u,= \va,9,1,%r0 | |
594 | #endif | |
595 | or,COND(tr) %r23,%r0,\pte | |
596 | or %r26,%r0,\pte | |
597 | .endm | |
598 | ||
599 | ||
600 | /* | |
601 | * Align fault_vector_20 on 4K boundary so that both | |
602 | * fault_vector_11 and fault_vector_20 are on the | |
603 | * same page. This is only necessary as long as we | |
604 | * write protect the kernel text, which we may stop | |
605 | * doing once we use large page translations to cover | |
606 | * the static part of the kernel address space. | |
607 | */ | |
608 | ||
dfcf753b | 609 | .text |
1da177e4 | 610 | |
873d50e2 | 611 | .align PAGE_SIZE |
1da177e4 | 612 | |
c5e76552 | 613 | ENTRY(fault_vector_20) |
1da177e4 LT |
614 | /* First vector is invalid (0) */ |
615 | .ascii "cows can fly" | |
616 | .byte 0 | |
617 | .align 32 | |
618 | ||
619 | hpmc 1 | |
620 | def 2 | |
621 | def 3 | |
622 | extint 4 | |
623 | def 5 | |
624 | itlb_20 6 | |
625 | def 7 | |
626 | def 8 | |
627 | def 9 | |
628 | def 10 | |
629 | def 11 | |
630 | def 12 | |
631 | def 13 | |
632 | def 14 | |
633 | dtlb_20 15 | |
634 | #if 0 | |
635 | naitlb_20 16 | |
636 | #else | |
637 | def 16 | |
638 | #endif | |
639 | nadtlb_20 17 | |
640 | def 18 | |
641 | def 19 | |
642 | dbit_20 20 | |
643 | def 21 | |
644 | def 22 | |
645 | def 23 | |
646 | def 24 | |
647 | def 25 | |
648 | def 26 | |
649 | def 27 | |
650 | def 28 | |
651 | def 29 | |
652 | def 30 | |
653 | def 31 | |
c5e76552 | 654 | END(fault_vector_20) |
1da177e4 | 655 | |
413059f2 | 656 | #ifndef CONFIG_64BIT |
1da177e4 | 657 | |
1da177e4 LT |
658 | .align 2048 |
659 | ||
c5e76552 | 660 | ENTRY(fault_vector_11) |
1da177e4 LT |
661 | /* First vector is invalid (0) */ |
662 | .ascii "cows can fly" | |
663 | .byte 0 | |
664 | .align 32 | |
665 | ||
666 | hpmc 1 | |
667 | def 2 | |
668 | def 3 | |
669 | extint 4 | |
670 | def 5 | |
671 | itlb_11 6 | |
672 | def 7 | |
673 | def 8 | |
674 | def 9 | |
675 | def 10 | |
676 | def 11 | |
677 | def 12 | |
678 | def 13 | |
679 | def 14 | |
680 | dtlb_11 15 | |
681 | #if 0 | |
682 | naitlb_11 16 | |
683 | #else | |
684 | def 16 | |
685 | #endif | |
686 | nadtlb_11 17 | |
687 | def 18 | |
688 | def 19 | |
689 | dbit_11 20 | |
690 | def 21 | |
691 | def 22 | |
692 | def 23 | |
693 | def 24 | |
694 | def 25 | |
695 | def 26 | |
696 | def 27 | |
697 | def 28 | |
698 | def 29 | |
699 | def 30 | |
700 | def 31 | |
c5e76552 | 701 | END(fault_vector_11) |
1da177e4 LT |
702 | |
703 | #endif | |
704 | ||
705 | .import handle_interruption,code | |
706 | .import do_cpu_irq_mask,code | |
707 | ||
708 | /* | |
709 | * r26 = function to be called | |
710 | * r25 = argument to pass in | |
711 | * r24 = flags for do_fork() | |
712 | * | |
713 | * Kernel threads don't ever return, so they don't need | |
714 | * a true register context. We just save away the arguments | |
715 | * for copy_thread/ret_ to properly set up the child. | |
716 | */ | |
717 | ||
718 | #define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */ | |
719 | #define CLONE_UNTRACED 0x00800000 | |
720 | ||
1da177e4 | 721 | .import do_fork |
c5e76552 | 722 | ENTRY(__kernel_thread) |
1da177e4 LT |
723 | STREG %r2, -RP_OFFSET(%r30) |
724 | ||
725 | copy %r30, %r1 | |
726 | ldo PT_SZ_ALGN(%r30),%r30 | |
413059f2 | 727 | #ifdef CONFIG_64BIT |
1da177e4 LT |
728 | /* Yo, function pointers in wide mode are little structs... -PB */ |
729 | ldd 24(%r26), %r2 | |
730 | STREG %r2, PT_GR27(%r1) /* Store childs %dp */ | |
731 | ldd 16(%r26), %r26 | |
732 | ||
733 | STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */ | |
734 | copy %r0, %r22 /* user_tid */ | |
735 | #endif | |
736 | STREG %r26, PT_GR26(%r1) /* Store function & argument for child */ | |
737 | STREG %r25, PT_GR25(%r1) | |
738 | ldil L%CLONE_UNTRACED, %r26 | |
739 | ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */ | |
740 | or %r26, %r24, %r26 /* will have kernel mappings. */ | |
741 | ldi 1, %r25 /* stack_start, signals kernel thread */ | |
742 | stw %r0, -52(%r30) /* user_tid */ | |
413059f2 | 743 | #ifdef CONFIG_64BIT |
1da177e4 LT |
744 | ldo -16(%r30),%r29 /* Reference param save area */ |
745 | #endif | |
746 | BL do_fork, %r2 | |
747 | copy %r1, %r24 /* pt_regs */ | |
748 | ||
749 | /* Parent Returns here */ | |
750 | ||
751 | LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2 | |
752 | ldo -PT_SZ_ALGN(%r30), %r30 | |
753 | bv %r0(%r2) | |
754 | nop | |
c5e76552 | 755 | ENDPROC(__kernel_thread) |
1da177e4 LT |
756 | |
757 | /* | |
758 | * Child Returns here | |
759 | * | |
760 | * copy_thread moved args from temp save area set up above | |
761 | * into task save area. | |
762 | */ | |
763 | ||
c5e76552 | 764 | ENTRY(ret_from_kernel_thread) |
1da177e4 LT |
765 | |
766 | /* Call schedule_tail first though */ | |
767 | BL schedule_tail, %r2 | |
768 | nop | |
769 | ||
770 | LDREG TI_TASK-THREAD_SZ_ALGN(%r30), %r1 | |
771 | LDREG TASK_PT_GR25(%r1), %r26 | |
413059f2 | 772 | #ifdef CONFIG_64BIT |
1da177e4 LT |
773 | LDREG TASK_PT_GR27(%r1), %r27 |
774 | LDREG TASK_PT_GR22(%r1), %r22 | |
775 | #endif | |
776 | LDREG TASK_PT_GR26(%r1), %r1 | |
777 | ble 0(%sr7, %r1) | |
778 | copy %r31, %r2 | |
779 | ||
413059f2 | 780 | #ifdef CONFIG_64BIT |
1da177e4 LT |
781 | ldo -16(%r30),%r29 /* Reference param save area */ |
782 | loadgp /* Thread could have been in a module */ | |
783 | #endif | |
99ac7947 | 784 | #ifndef CONFIG_64BIT |
1da177e4 | 785 | b sys_exit |
99ac7947 RC |
786 | #else |
787 | load32 sys_exit, %r1 | |
788 | bv %r0(%r1) | |
789 | #endif | |
1da177e4 | 790 | ldi 0, %r26 |
c5e76552 | 791 | ENDPROC(ret_from_kernel_thread) |
1da177e4 LT |
792 | |
793 | .import sys_execve, code | |
c5e76552 | 794 | ENTRY(__execve) |
1da177e4 LT |
795 | copy %r2, %r15 |
796 | copy %r30, %r16 | |
797 | ldo PT_SZ_ALGN(%r30), %r30 | |
798 | STREG %r26, PT_GR26(%r16) | |
799 | STREG %r25, PT_GR25(%r16) | |
800 | STREG %r24, PT_GR24(%r16) | |
413059f2 | 801 | #ifdef CONFIG_64BIT |
1da177e4 LT |
802 | ldo -16(%r30),%r29 /* Reference param save area */ |
803 | #endif | |
804 | BL sys_execve, %r2 | |
805 | copy %r16, %r26 | |
806 | ||
807 | cmpib,=,n 0,%r28,intr_return /* forward */ | |
808 | ||
809 | /* yes, this will trap and die. */ | |
810 | copy %r15, %r2 | |
811 | copy %r16, %r30 | |
812 | bv %r0(%r2) | |
813 | nop | |
c5e76552 | 814 | ENDPROC(__execve) |
1da177e4 | 815 | |
1da177e4 LT |
816 | |
817 | /* | |
818 | * struct task_struct *_switch_to(struct task_struct *prev, | |
819 | * struct task_struct *next) | |
820 | * | |
821 | * switch kernel stacks and return prev */ | |
c5e76552 | 822 | ENTRY(_switch_to) |
1da177e4 LT |
823 | STREG %r2, -RP_OFFSET(%r30) |
824 | ||
618febd6 | 825 | callee_save_float |
1da177e4 LT |
826 | callee_save |
827 | ||
828 | load32 _switch_to_ret, %r2 | |
829 | ||
830 | STREG %r2, TASK_PT_KPC(%r26) | |
831 | LDREG TASK_PT_KPC(%r25), %r2 | |
832 | ||
833 | STREG %r30, TASK_PT_KSP(%r26) | |
834 | LDREG TASK_PT_KSP(%r25), %r30 | |
835 | LDREG TASK_THREAD_INFO(%r25), %r25 | |
836 | bv %r0(%r2) | |
837 | mtctl %r25,%cr30 | |
838 | ||
839 | _switch_to_ret: | |
840 | mtctl %r0, %cr0 /* Needed for single stepping */ | |
841 | callee_rest | |
618febd6 | 842 | callee_rest_float |
1da177e4 LT |
843 | |
844 | LDREG -RP_OFFSET(%r30), %r2 | |
845 | bv %r0(%r2) | |
846 | copy %r26, %r28 | |
c5e76552 | 847 | ENDPROC(_switch_to) |
1da177e4 LT |
848 | |
849 | /* | |
850 | * Common rfi return path for interruptions, kernel execve, and | |
851 | * sys_rt_sigreturn (sometimes). The sys_rt_sigreturn syscall will | |
852 | * return via this path if the signal was received when the process | |
853 | * was running; if the process was blocked on a syscall then the | |
854 | * normal syscall_exit path is used. All syscalls for traced | |
855 | * proceses exit via intr_restore. | |
856 | * | |
857 | * XXX If any syscalls that change a processes space id ever exit | |
858 | * this way, then we will need to copy %sr3 in to PT_SR[3..7], and | |
859 | * adjust IASQ[0..1]. | |
860 | * | |
1da177e4 LT |
861 | */ |
862 | ||
873d50e2 | 863 | .align PAGE_SIZE |
1da177e4 | 864 | |
c5e76552 | 865 | ENTRY(syscall_exit_rfi) |
1da177e4 LT |
866 | mfctl %cr30,%r16 |
867 | LDREG TI_TASK(%r16), %r16 /* thread_info -> task_struct */ | |
868 | ldo TASK_REGS(%r16),%r16 | |
869 | /* Force iaoq to userspace, as the user has had access to our current | |
870 | * context via sigcontext. Also Filter the PSW for the same reason. | |
871 | */ | |
872 | LDREG PT_IAOQ0(%r16),%r19 | |
873 | depi 3,31,2,%r19 | |
874 | STREG %r19,PT_IAOQ0(%r16) | |
875 | LDREG PT_IAOQ1(%r16),%r19 | |
876 | depi 3,31,2,%r19 | |
877 | STREG %r19,PT_IAOQ1(%r16) | |
878 | LDREG PT_PSW(%r16),%r19 | |
879 | load32 USER_PSW_MASK,%r1 | |
413059f2 | 880 | #ifdef CONFIG_64BIT |
1da177e4 LT |
881 | load32 USER_PSW_HI_MASK,%r20 |
882 | depd %r20,31,32,%r1 | |
883 | #endif | |
884 | and %r19,%r1,%r19 /* Mask out bits that user shouldn't play with */ | |
885 | load32 USER_PSW,%r1 | |
886 | or %r19,%r1,%r19 /* Make sure default USER_PSW bits are set */ | |
887 | STREG %r19,PT_PSW(%r16) | |
888 | ||
889 | /* | |
890 | * If we aren't being traced, we never saved space registers | |
891 | * (we don't store them in the sigcontext), so set them | |
892 | * to "proper" values now (otherwise we'll wind up restoring | |
893 | * whatever was last stored in the task structure, which might | |
894 | * be inconsistent if an interrupt occured while on the gateway | |
4b3f686d ML |
895 | * page). Note that we may be "trashing" values the user put in |
896 | * them, but we don't support the user changing them. | |
1da177e4 LT |
897 | */ |
898 | ||
899 | STREG %r0,PT_SR2(%r16) | |
900 | mfsp %sr3,%r19 | |
901 | STREG %r19,PT_SR0(%r16) | |
902 | STREG %r19,PT_SR1(%r16) | |
903 | STREG %r19,PT_SR3(%r16) | |
904 | STREG %r19,PT_SR4(%r16) | |
905 | STREG %r19,PT_SR5(%r16) | |
906 | STREG %r19,PT_SR6(%r16) | |
907 | STREG %r19,PT_SR7(%r16) | |
908 | ||
909 | intr_return: | |
910 | /* NOTE: Need to enable interrupts incase we schedule. */ | |
911 | ssm PSW_SM_I, %r0 | |
912 | ||
1da177e4 LT |
913 | intr_check_resched: |
914 | ||
915 | /* check for reschedule */ | |
916 | mfctl %cr30,%r1 | |
917 | LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */ | |
918 | bb,<,n %r19,31-TIF_NEED_RESCHED,intr_do_resched /* forward */ | |
919 | ||
4650f0a5 | 920 | .import do_notify_resume,code |
1da177e4 LT |
921 | intr_check_sig: |
922 | /* As above */ | |
923 | mfctl %cr30,%r1 | |
4650f0a5 | 924 | LDREG TI_FLAGS(%r1),%r19 |
d0420c83 | 925 | ldi (_TIF_SIGPENDING|_TIF_RESTORE_SIGMASK|_TIF_NOTIFY_RESUME), %r20 |
4650f0a5 KM |
926 | and,COND(<>) %r19, %r20, %r0 |
927 | b,n intr_restore /* skip past if we've nothing to do */ | |
928 | ||
929 | /* This check is critical to having LWS | |
930 | * working. The IASQ is zero on the gateway | |
931 | * page and we cannot deliver any signals until | |
932 | * we get off the gateway page. | |
933 | * | |
934 | * Only do signals if we are returning to user space | |
935 | */ | |
936 | LDREG PT_IASQ0(%r16), %r20 | |
872f6deb | 937 | cmpib,COND(=),n 0,%r20,intr_restore /* backward */ |
4650f0a5 | 938 | LDREG PT_IASQ1(%r16), %r20 |
872f6deb | 939 | cmpib,COND(=),n 0,%r20,intr_restore /* backward */ |
4650f0a5 KM |
940 | |
941 | copy %r0, %r25 /* long in_syscall = 0 */ | |
942 | #ifdef CONFIG_64BIT | |
943 | ldo -16(%r30),%r29 /* Reference param save area */ | |
944 | #endif | |
945 | ||
946 | BL do_notify_resume,%r2 | |
947 | copy %r16, %r26 /* struct pt_regs *regs */ | |
948 | ||
3fe4c55e | 949 | b,n intr_check_sig |
1da177e4 LT |
950 | |
951 | intr_restore: | |
952 | copy %r16,%r29 | |
953 | ldo PT_FR31(%r29),%r1 | |
954 | rest_fp %r1 | |
955 | rest_general %r29 | |
956 | ||
896a3756 GG |
957 | /* inverse of virt_map */ |
958 | pcxt_ssm_bug | |
959 | rsm PSW_SM_QUIET,%r0 /* prepare for rfi */ | |
1da177e4 | 960 | tophys_r1 %r29 |
1da177e4 LT |
961 | |
962 | /* Restore space id's and special cr's from PT_REGS | |
896a3756 GG |
963 | * structure pointed to by r29 |
964 | */ | |
1da177e4 LT |
965 | rest_specials %r29 |
966 | ||
896a3756 GG |
967 | /* IMPORTANT: rest_stack restores r29 last (we are using it)! |
968 | * It also restores r1 and r30. | |
969 | */ | |
1da177e4 LT |
970 | rest_stack |
971 | ||
972 | rfi | |
973 | nop | |
1da177e4 | 974 | |
50a34dbd KM |
975 | #ifndef CONFIG_PREEMPT |
976 | # define intr_do_preempt intr_restore | |
977 | #endif /* !CONFIG_PREEMPT */ | |
978 | ||
1da177e4 LT |
979 | .import schedule,code |
980 | intr_do_resched: | |
50a34dbd KM |
981 | /* Only call schedule on return to userspace. If we're returning |
982 | * to kernel space, we may schedule if CONFIG_PREEMPT, otherwise | |
983 | * we jump back to intr_restore. | |
984 | */ | |
1da177e4 | 985 | LDREG PT_IASQ0(%r16), %r20 |
872f6deb | 986 | cmpib,COND(=) 0, %r20, intr_do_preempt |
1da177e4 LT |
987 | nop |
988 | LDREG PT_IASQ1(%r16), %r20 | |
872f6deb | 989 | cmpib,COND(=) 0, %r20, intr_do_preempt |
1da177e4 LT |
990 | nop |
991 | ||
413059f2 | 992 | #ifdef CONFIG_64BIT |
1da177e4 LT |
993 | ldo -16(%r30),%r29 /* Reference param save area */ |
994 | #endif | |
995 | ||
996 | ldil L%intr_check_sig, %r2 | |
99ac7947 | 997 | #ifndef CONFIG_64BIT |
1da177e4 | 998 | b schedule |
99ac7947 RC |
999 | #else |
1000 | load32 schedule, %r20 | |
1001 | bv %r0(%r20) | |
1002 | #endif | |
1da177e4 LT |
1003 | ldo R%intr_check_sig(%r2), %r2 |
1004 | ||
50a34dbd KM |
1005 | /* preempt the current task on returning to kernel |
1006 | * mode from an interrupt, iff need_resched is set, | |
1007 | * and preempt_count is 0. otherwise, we continue on | |
1008 | * our merry way back to the current running task. | |
1009 | */ | |
1010 | #ifdef CONFIG_PREEMPT | |
1011 | .import preempt_schedule_irq,code | |
1012 | intr_do_preempt: | |
1013 | rsm PSW_SM_I, %r0 /* disable interrupts */ | |
1014 | ||
1015 | /* current_thread_info()->preempt_count */ | |
1016 | mfctl %cr30, %r1 | |
1017 | LDREG TI_PRE_COUNT(%r1), %r19 | |
872f6deb | 1018 | cmpib,COND(<>) 0, %r19, intr_restore /* if preempt_count > 0 */ |
50a34dbd KM |
1019 | nop /* prev insn branched backwards */ |
1020 | ||
1021 | /* check if we interrupted a critical path */ | |
1022 | LDREG PT_PSW(%r16), %r20 | |
1023 | bb,<,n %r20, 31 - PSW_SM_I, intr_restore | |
1024 | nop | |
1025 | ||
1026 | BL preempt_schedule_irq, %r2 | |
1027 | nop | |
1028 | ||
9c2c5457 | 1029 | b,n intr_restore /* ssm PSW_SM_I done by intr_restore */ |
50a34dbd | 1030 | #endif /* CONFIG_PREEMPT */ |
1da177e4 | 1031 | |
1da177e4 LT |
1032 | /* |
1033 | * External interrupts. | |
1034 | */ | |
1035 | ||
1036 | intr_extint: | |
872f6deb | 1037 | cmpib,COND(=),n 0,%r16,1f |
6cc4525d | 1038 | |
1da177e4 | 1039 | get_stack_use_cr30 |
6cc4525d | 1040 | b,n 2f |
1da177e4 LT |
1041 | |
1042 | 1: | |
1da177e4 | 1043 | get_stack_use_r30 |
6cc4525d | 1044 | 2: |
1da177e4 LT |
1045 | save_specials %r29 |
1046 | virt_map | |
1047 | save_general %r29 | |
1048 | ||
1049 | ldo PT_FR0(%r29), %r24 | |
1050 | save_fp %r24 | |
1051 | ||
1052 | loadgp | |
1053 | ||
1054 | copy %r29, %r26 /* arg0 is pt_regs */ | |
1055 | copy %r29, %r16 /* save pt_regs */ | |
1056 | ||
1057 | ldil L%intr_return, %r2 | |
1058 | ||
413059f2 | 1059 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1060 | ldo -16(%r30),%r29 /* Reference param save area */ |
1061 | #endif | |
1062 | ||
1063 | b do_cpu_irq_mask | |
1064 | ldo R%intr_return(%r2), %r2 /* return to intr_return, not here */ | |
c5e76552 | 1065 | ENDPROC(syscall_exit_rfi) |
1da177e4 LT |
1066 | |
1067 | ||
1068 | /* Generic interruptions (illegal insn, unaligned, page fault, etc) */ | |
1069 | ||
c5e76552 | 1070 | ENTRY(intr_save) /* for os_hpmc */ |
1da177e4 | 1071 | mfsp %sr7,%r16 |
872f6deb | 1072 | cmpib,COND(=),n 0,%r16,1f |
1da177e4 LT |
1073 | get_stack_use_cr30 |
1074 | b 2f | |
1075 | copy %r8,%r26 | |
1076 | ||
1077 | 1: | |
1078 | get_stack_use_r30 | |
1079 | copy %r8,%r26 | |
1080 | ||
1081 | 2: | |
1082 | save_specials %r29 | |
1083 | ||
1084 | /* If this trap is a itlb miss, skip saving/adjusting isr/ior */ | |
1085 | ||
1086 | /* | |
1087 | * FIXME: 1) Use a #define for the hardwired "6" below (and in | |
1088 | * traps.c. | |
1089 | * 2) Once we start executing code above 4 Gb, we need | |
1090 | * to adjust iasq/iaoq here in the same way we | |
1091 | * adjust isr/ior below. | |
1092 | */ | |
1093 | ||
872f6deb | 1094 | cmpib,COND(=),n 6,%r26,skip_save_ior |
1da177e4 | 1095 | |
1da177e4 LT |
1096 | |
1097 | mfctl %cr20, %r16 /* isr */ | |
896a3756 | 1098 | nop /* serialize mfctl on PA 2.0 to avoid 4 cycle penalty */ |
1da177e4 LT |
1099 | mfctl %cr21, %r17 /* ior */ |
1100 | ||
896a3756 | 1101 | |
413059f2 | 1102 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1103 | /* |
1104 | * If the interrupted code was running with W bit off (32 bit), | |
1105 | * clear the b bits (bits 0 & 1) in the ior. | |
896a3756 | 1106 | * save_specials left ipsw value in r8 for us to test. |
1da177e4 LT |
1107 | */ |
1108 | extrd,u,*<> %r8,PSW_W_BIT,1,%r0 | |
1109 | depdi 0,1,2,%r17 | |
1110 | ||
1111 | /* | |
1112 | * FIXME: This code has hardwired assumptions about the split | |
1113 | * between space bits and offset bits. This will change | |
1114 | * when we allow alternate page sizes. | |
1115 | */ | |
1116 | ||
1117 | /* adjust isr/ior. */ | |
2fd83038 HD |
1118 | extrd,u %r16,63,SPACEID_SHIFT,%r1 /* get high bits from isr for ior */ |
1119 | depd %r1,31,SPACEID_SHIFT,%r17 /* deposit them into ior */ | |
1120 | depdi 0,63,SPACEID_SHIFT,%r16 /* clear them from isr */ | |
1da177e4 LT |
1121 | #endif |
1122 | STREG %r16, PT_ISR(%r29) | |
1123 | STREG %r17, PT_IOR(%r29) | |
1124 | ||
1125 | ||
1126 | skip_save_ior: | |
1127 | virt_map | |
1128 | save_general %r29 | |
1129 | ||
1130 | ldo PT_FR0(%r29), %r25 | |
1131 | save_fp %r25 | |
1132 | ||
1133 | loadgp | |
1134 | ||
1135 | copy %r29, %r25 /* arg1 is pt_regs */ | |
413059f2 | 1136 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1137 | ldo -16(%r30),%r29 /* Reference param save area */ |
1138 | #endif | |
1139 | ||
1140 | ldil L%intr_check_sig, %r2 | |
1141 | copy %r25, %r16 /* save pt_regs */ | |
1142 | ||
1143 | b handle_interruption | |
1144 | ldo R%intr_check_sig(%r2), %r2 | |
c5e76552 | 1145 | ENDPROC(intr_save) |
1da177e4 LT |
1146 | |
1147 | ||
1148 | /* | |
1149 | * Note for all tlb miss handlers: | |
1150 | * | |
1151 | * cr24 contains a pointer to the kernel address space | |
1152 | * page directory. | |
1153 | * | |
1154 | * cr25 contains a pointer to the current user address | |
1155 | * space page directory. | |
1156 | * | |
1157 | * sr3 will contain the space id of the user address space | |
1158 | * of the current running thread while that thread is | |
1159 | * running in the kernel. | |
1160 | */ | |
1161 | ||
1162 | /* | |
1163 | * register number allocations. Note that these are all | |
1164 | * in the shadowed registers | |
1165 | */ | |
1166 | ||
1167 | t0 = r1 /* temporary register 0 */ | |
1168 | va = r8 /* virtual address for which the trap occured */ | |
1169 | t1 = r9 /* temporary register 1 */ | |
1170 | pte = r16 /* pte/phys page # */ | |
1171 | prot = r17 /* prot bits */ | |
1172 | spc = r24 /* space for which the trap occured */ | |
1173 | ptp = r25 /* page directory/page table pointer */ | |
1174 | ||
413059f2 | 1175 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1176 | |
1177 | dtlb_miss_20w: | |
1178 | space_adjust spc,va,t0 | |
1179 | get_pgd spc,ptp | |
1180 | space_check spc,t0,dtlb_fault | |
1181 | ||
1182 | L3_ptep ptp,pte,t0,va,dtlb_check_alias_20w | |
1183 | ||
1184 | update_ptep ptp,pte,t0,t1 | |
1185 | ||
1186 | make_insert_tlb spc,pte,prot | |
1187 | ||
1188 | idtlbt pte,prot | |
1189 | ||
1190 | rfir | |
1191 | nop | |
1192 | ||
1193 | dtlb_check_alias_20w: | |
1194 | do_alias spc,t0,t1,va,pte,prot,dtlb_fault | |
1195 | ||
1196 | idtlbt pte,prot | |
1197 | ||
1198 | rfir | |
1199 | nop | |
1200 | ||
1201 | nadtlb_miss_20w: | |
1202 | space_adjust spc,va,t0 | |
1203 | get_pgd spc,ptp | |
1204 | space_check spc,t0,nadtlb_fault | |
1205 | ||
1206 | L3_ptep ptp,pte,t0,va,nadtlb_check_flush_20w | |
1207 | ||
1208 | update_ptep ptp,pte,t0,t1 | |
1209 | ||
1210 | make_insert_tlb spc,pte,prot | |
1211 | ||
1212 | idtlbt pte,prot | |
1213 | ||
1214 | rfir | |
1215 | nop | |
1216 | ||
1217 | nadtlb_check_flush_20w: | |
1218 | bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate | |
1219 | ||
1220 | /* Insert a "flush only" translation */ | |
1221 | ||
1222 | depdi,z 7,7,3,prot | |
1223 | depdi 1,10,1,prot | |
1224 | ||
afca2523 HD |
1225 | /* Drop prot bits from pte and convert to page addr for idtlbt */ |
1226 | convert_for_tlb_insert20 pte | |
1da177e4 | 1227 | |
1da177e4 LT |
1228 | idtlbt pte,prot |
1229 | ||
1230 | rfir | |
1231 | nop | |
1232 | ||
1233 | #else | |
1234 | ||
1235 | dtlb_miss_11: | |
1236 | get_pgd spc,ptp | |
1237 | ||
1238 | space_check spc,t0,dtlb_fault | |
1239 | ||
1240 | L2_ptep ptp,pte,t0,va,dtlb_check_alias_11 | |
1241 | ||
1242 | update_ptep ptp,pte,t0,t1 | |
1243 | ||
1244 | make_insert_tlb_11 spc,pte,prot | |
1245 | ||
1246 | mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */ | |
1247 | mtsp spc,%sr1 | |
1248 | ||
1249 | idtlba pte,(%sr1,va) | |
1250 | idtlbp prot,(%sr1,va) | |
1251 | ||
1252 | mtsp t0, %sr1 /* Restore sr1 */ | |
1253 | ||
1254 | rfir | |
1255 | nop | |
1256 | ||
1257 | dtlb_check_alias_11: | |
1258 | ||
1259 | /* Check to see if fault is in the temporary alias region */ | |
1260 | ||
1261 | cmpib,<>,n 0,spc,dtlb_fault /* forward */ | |
1262 | ldil L%(TMPALIAS_MAP_START),t0 | |
1263 | copy va,t1 | |
1264 | depwi 0,31,23,t1 | |
1265 | cmpb,<>,n t0,t1,dtlb_fault /* forward */ | |
1266 | ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),prot | |
1267 | depw,z prot,8,7,prot | |
1268 | ||
1269 | /* | |
1270 | * OK, it is in the temp alias region, check whether "from" or "to". | |
1271 | * Check "subtle" note in pacache.S re: r23/r26. | |
1272 | */ | |
1273 | ||
1274 | extrw,u,= va,9,1,r0 | |
1275 | or,tr %r23,%r0,pte /* If "from" use "from" page */ | |
1276 | or %r26,%r0,pte /* else "to", use "to" page */ | |
1277 | ||
1278 | idtlba pte,(va) | |
1279 | idtlbp prot,(va) | |
1280 | ||
1281 | rfir | |
1282 | nop | |
1283 | ||
1284 | nadtlb_miss_11: | |
1285 | get_pgd spc,ptp | |
1286 | ||
1287 | space_check spc,t0,nadtlb_fault | |
1288 | ||
1289 | L2_ptep ptp,pte,t0,va,nadtlb_check_flush_11 | |
1290 | ||
1291 | update_ptep ptp,pte,t0,t1 | |
1292 | ||
1293 | make_insert_tlb_11 spc,pte,prot | |
1294 | ||
1295 | ||
1296 | mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */ | |
1297 | mtsp spc,%sr1 | |
1298 | ||
1299 | idtlba pte,(%sr1,va) | |
1300 | idtlbp prot,(%sr1,va) | |
1301 | ||
1302 | mtsp t0, %sr1 /* Restore sr1 */ | |
1303 | ||
1304 | rfir | |
1305 | nop | |
1306 | ||
1307 | nadtlb_check_flush_11: | |
1308 | bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate | |
1309 | ||
1310 | /* Insert a "flush only" translation */ | |
1311 | ||
1312 | zdepi 7,7,3,prot | |
1313 | depi 1,10,1,prot | |
1314 | ||
1315 | /* Get rid of prot bits and convert to page addr for idtlba */ | |
1316 | ||
1152a68c HD |
1317 | depi 0,31,ASM_PFN_PTE_SHIFT,pte |
1318 | SHRREG pte,(ASM_PFN_PTE_SHIFT-(31-26)),pte | |
1da177e4 LT |
1319 | |
1320 | mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */ | |
1321 | mtsp spc,%sr1 | |
1322 | ||
1323 | idtlba pte,(%sr1,va) | |
1324 | idtlbp prot,(%sr1,va) | |
1325 | ||
1326 | mtsp t0, %sr1 /* Restore sr1 */ | |
1327 | ||
1328 | rfir | |
1329 | nop | |
1330 | ||
1331 | dtlb_miss_20: | |
1332 | space_adjust spc,va,t0 | |
1333 | get_pgd spc,ptp | |
1334 | space_check spc,t0,dtlb_fault | |
1335 | ||
1336 | L2_ptep ptp,pte,t0,va,dtlb_check_alias_20 | |
1337 | ||
1338 | update_ptep ptp,pte,t0,t1 | |
1339 | ||
1340 | make_insert_tlb spc,pte,prot | |
1341 | ||
1342 | f_extend pte,t0 | |
1343 | ||
1344 | idtlbt pte,prot | |
1345 | ||
1346 | rfir | |
1347 | nop | |
1348 | ||
1349 | dtlb_check_alias_20: | |
1350 | do_alias spc,t0,t1,va,pte,prot,dtlb_fault | |
1351 | ||
1352 | idtlbt pte,prot | |
1353 | ||
1354 | rfir | |
1355 | nop | |
1356 | ||
1357 | nadtlb_miss_20: | |
1358 | get_pgd spc,ptp | |
1359 | ||
1360 | space_check spc,t0,nadtlb_fault | |
1361 | ||
1362 | L2_ptep ptp,pte,t0,va,nadtlb_check_flush_20 | |
1363 | ||
1364 | update_ptep ptp,pte,t0,t1 | |
1365 | ||
1366 | make_insert_tlb spc,pte,prot | |
1367 | ||
1368 | f_extend pte,t0 | |
1369 | ||
1370 | idtlbt pte,prot | |
1371 | ||
1372 | rfir | |
1373 | nop | |
1374 | ||
1375 | nadtlb_check_flush_20: | |
1376 | bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate | |
1377 | ||
1378 | /* Insert a "flush only" translation */ | |
1379 | ||
1380 | depdi,z 7,7,3,prot | |
1381 | depdi 1,10,1,prot | |
1382 | ||
afca2523 HD |
1383 | /* Drop prot bits from pte and convert to page addr for idtlbt */ |
1384 | convert_for_tlb_insert20 pte | |
1da177e4 | 1385 | |
1da177e4 LT |
1386 | idtlbt pte,prot |
1387 | ||
1388 | rfir | |
1389 | nop | |
1390 | #endif | |
1391 | ||
1392 | nadtlb_emulate: | |
1393 | ||
1394 | /* | |
1395 | * Non access misses can be caused by fdc,fic,pdc,lpa,probe and | |
1396 | * probei instructions. We don't want to fault for these | |
1397 | * instructions (not only does it not make sense, it can cause | |
1398 | * deadlocks, since some flushes are done with the mmap | |
1399 | * semaphore held). If the translation doesn't exist, we can't | |
1400 | * insert a translation, so have to emulate the side effects | |
1401 | * of the instruction. Since we don't insert a translation | |
1402 | * we can get a lot of faults during a flush loop, so it makes | |
1403 | * sense to try to do it here with minimum overhead. We only | |
1404 | * emulate fdc,fic,pdc,probew,prober instructions whose base | |
1405 | * and index registers are not shadowed. We defer everything | |
1406 | * else to the "slow" path. | |
1407 | */ | |
1408 | ||
1409 | mfctl %cr19,%r9 /* Get iir */ | |
1410 | ||
1411 | /* PA 2.0 Arch Ref. Book pg 382 has a good description of the insn bits. | |
1412 | Checks for fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw */ | |
1413 | ||
1414 | /* Checks for fdc,fdce,pdc,"fic,4f" only */ | |
1415 | ldi 0x280,%r16 | |
1416 | and %r9,%r16,%r17 | |
1417 | cmpb,<>,n %r16,%r17,nadtlb_probe_check | |
1418 | bb,>=,n %r9,26,nadtlb_nullify /* m bit not set, just nullify */ | |
1419 | BL get_register,%r25 | |
1420 | extrw,u %r9,15,5,%r8 /* Get index register # */ | |
872f6deb | 1421 | cmpib,COND(=),n -1,%r1,nadtlb_fault /* have to use slow path */ |
1da177e4 LT |
1422 | copy %r1,%r24 |
1423 | BL get_register,%r25 | |
1424 | extrw,u %r9,10,5,%r8 /* Get base register # */ | |
872f6deb | 1425 | cmpib,COND(=),n -1,%r1,nadtlb_fault /* have to use slow path */ |
1da177e4 LT |
1426 | BL set_register,%r25 |
1427 | add,l %r1,%r24,%r1 /* doesn't affect c/b bits */ | |
1428 | ||
1429 | nadtlb_nullify: | |
896a3756 | 1430 | mfctl %ipsw,%r8 |
1da177e4 LT |
1431 | ldil L%PSW_N,%r9 |
1432 | or %r8,%r9,%r8 /* Set PSW_N */ | |
896a3756 | 1433 | mtctl %r8,%ipsw |
1da177e4 LT |
1434 | |
1435 | rfir | |
1436 | nop | |
1437 | ||
1438 | /* | |
1439 | When there is no translation for the probe address then we | |
1440 | must nullify the insn and return zero in the target regsiter. | |
1441 | This will indicate to the calling code that it does not have | |
1442 | write/read privileges to this address. | |
1443 | ||
1444 | This should technically work for prober and probew in PA 1.1, | |
1445 | and also probe,r and probe,w in PA 2.0 | |
1446 | ||
1447 | WARNING: USE ONLY NON-SHADOW REGISTERS WITH PROBE INSN! | |
1448 | THE SLOW-PATH EMULATION HAS NOT BEEN WRITTEN YET. | |
1449 | ||
1450 | */ | |
1451 | nadtlb_probe_check: | |
1452 | ldi 0x80,%r16 | |
1453 | and %r9,%r16,%r17 | |
1454 | cmpb,<>,n %r16,%r17,nadtlb_fault /* Must be probe,[rw]*/ | |
1455 | BL get_register,%r25 /* Find the target register */ | |
1456 | extrw,u %r9,31,5,%r8 /* Get target register */ | |
872f6deb | 1457 | cmpib,COND(=),n -1,%r1,nadtlb_fault /* have to use slow path */ |
1da177e4 LT |
1458 | BL set_register,%r25 |
1459 | copy %r0,%r1 /* Write zero to target register */ | |
1460 | b nadtlb_nullify /* Nullify return insn */ | |
1461 | nop | |
1462 | ||
1463 | ||
413059f2 | 1464 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1465 | itlb_miss_20w: |
1466 | ||
1467 | /* | |
1468 | * I miss is a little different, since we allow users to fault | |
1469 | * on the gateway page which is in the kernel address space. | |
1470 | */ | |
1471 | ||
1472 | space_adjust spc,va,t0 | |
1473 | get_pgd spc,ptp | |
1474 | space_check spc,t0,itlb_fault | |
1475 | ||
1476 | L3_ptep ptp,pte,t0,va,itlb_fault | |
1477 | ||
1478 | update_ptep ptp,pte,t0,t1 | |
1479 | ||
1480 | make_insert_tlb spc,pte,prot | |
1481 | ||
1482 | iitlbt pte,prot | |
1483 | ||
1484 | rfir | |
1485 | nop | |
1486 | ||
1487 | #else | |
1488 | ||
1489 | itlb_miss_11: | |
1490 | get_pgd spc,ptp | |
1491 | ||
1492 | space_check spc,t0,itlb_fault | |
1493 | ||
1494 | L2_ptep ptp,pte,t0,va,itlb_fault | |
1495 | ||
1496 | update_ptep ptp,pte,t0,t1 | |
1497 | ||
1498 | make_insert_tlb_11 spc,pte,prot | |
1499 | ||
1500 | mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */ | |
1501 | mtsp spc,%sr1 | |
1502 | ||
1503 | iitlba pte,(%sr1,va) | |
1504 | iitlbp prot,(%sr1,va) | |
1505 | ||
1506 | mtsp t0, %sr1 /* Restore sr1 */ | |
1507 | ||
1508 | rfir | |
1509 | nop | |
1510 | ||
1511 | itlb_miss_20: | |
1512 | get_pgd spc,ptp | |
1513 | ||
1514 | space_check spc,t0,itlb_fault | |
1515 | ||
1516 | L2_ptep ptp,pte,t0,va,itlb_fault | |
1517 | ||
1518 | update_ptep ptp,pte,t0,t1 | |
1519 | ||
1520 | make_insert_tlb spc,pte,prot | |
1521 | ||
1522 | f_extend pte,t0 | |
1523 | ||
1524 | iitlbt pte,prot | |
1525 | ||
1526 | rfir | |
1527 | nop | |
1528 | ||
1529 | #endif | |
1530 | ||
413059f2 | 1531 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1532 | |
1533 | dbit_trap_20w: | |
1534 | space_adjust spc,va,t0 | |
1535 | get_pgd spc,ptp | |
1536 | space_check spc,t0,dbit_fault | |
1537 | ||
1538 | L3_ptep ptp,pte,t0,va,dbit_fault | |
1539 | ||
1540 | #ifdef CONFIG_SMP | |
872f6deb | 1541 | cmpib,COND(=),n 0,spc,dbit_nolock_20w |
1da177e4 LT |
1542 | load32 PA(pa_dbit_lock),t0 |
1543 | ||
1544 | dbit_spin_20w: | |
64f49532 | 1545 | LDCW 0(t0),t1 |
872f6deb | 1546 | cmpib,COND(=) 0,t1,dbit_spin_20w |
1da177e4 LT |
1547 | nop |
1548 | ||
1549 | dbit_nolock_20w: | |
1550 | #endif | |
1551 | update_dirty ptp,pte,t1 | |
1552 | ||
1553 | make_insert_tlb spc,pte,prot | |
1554 | ||
1555 | idtlbt pte,prot | |
1556 | #ifdef CONFIG_SMP | |
872f6deb | 1557 | cmpib,COND(=),n 0,spc,dbit_nounlock_20w |
1da177e4 LT |
1558 | ldi 1,t1 |
1559 | stw t1,0(t0) | |
1560 | ||
1561 | dbit_nounlock_20w: | |
1562 | #endif | |
1563 | ||
1564 | rfir | |
1565 | nop | |
1566 | #else | |
1567 | ||
1568 | dbit_trap_11: | |
1569 | ||
1570 | get_pgd spc,ptp | |
1571 | ||
1572 | space_check spc,t0,dbit_fault | |
1573 | ||
1574 | L2_ptep ptp,pte,t0,va,dbit_fault | |
1575 | ||
1576 | #ifdef CONFIG_SMP | |
872f6deb | 1577 | cmpib,COND(=),n 0,spc,dbit_nolock_11 |
1da177e4 LT |
1578 | load32 PA(pa_dbit_lock),t0 |
1579 | ||
1580 | dbit_spin_11: | |
64f49532 | 1581 | LDCW 0(t0),t1 |
1da177e4 LT |
1582 | cmpib,= 0,t1,dbit_spin_11 |
1583 | nop | |
1584 | ||
1585 | dbit_nolock_11: | |
1586 | #endif | |
1587 | update_dirty ptp,pte,t1 | |
1588 | ||
1589 | make_insert_tlb_11 spc,pte,prot | |
1590 | ||
1591 | mfsp %sr1,t1 /* Save sr1 so we can use it in tlb inserts */ | |
1592 | mtsp spc,%sr1 | |
1593 | ||
1594 | idtlba pte,(%sr1,va) | |
1595 | idtlbp prot,(%sr1,va) | |
1596 | ||
1597 | mtsp t1, %sr1 /* Restore sr1 */ | |
1598 | #ifdef CONFIG_SMP | |
872f6deb | 1599 | cmpib,COND(=),n 0,spc,dbit_nounlock_11 |
1da177e4 LT |
1600 | ldi 1,t1 |
1601 | stw t1,0(t0) | |
1602 | ||
1603 | dbit_nounlock_11: | |
1604 | #endif | |
1605 | ||
1606 | rfir | |
1607 | nop | |
1608 | ||
1609 | dbit_trap_20: | |
1610 | get_pgd spc,ptp | |
1611 | ||
1612 | space_check spc,t0,dbit_fault | |
1613 | ||
1614 | L2_ptep ptp,pte,t0,va,dbit_fault | |
1615 | ||
1616 | #ifdef CONFIG_SMP | |
872f6deb | 1617 | cmpib,COND(=),n 0,spc,dbit_nolock_20 |
1da177e4 LT |
1618 | load32 PA(pa_dbit_lock),t0 |
1619 | ||
1620 | dbit_spin_20: | |
64f49532 | 1621 | LDCW 0(t0),t1 |
1da177e4 LT |
1622 | cmpib,= 0,t1,dbit_spin_20 |
1623 | nop | |
1624 | ||
1625 | dbit_nolock_20: | |
1626 | #endif | |
1627 | update_dirty ptp,pte,t1 | |
1628 | ||
1629 | make_insert_tlb spc,pte,prot | |
1630 | ||
1631 | f_extend pte,t1 | |
1632 | ||
1633 | idtlbt pte,prot | |
1634 | ||
1635 | #ifdef CONFIG_SMP | |
872f6deb | 1636 | cmpib,COND(=),n 0,spc,dbit_nounlock_20 |
1da177e4 LT |
1637 | ldi 1,t1 |
1638 | stw t1,0(t0) | |
1639 | ||
1640 | dbit_nounlock_20: | |
1641 | #endif | |
1642 | ||
1643 | rfir | |
1644 | nop | |
1645 | #endif | |
1646 | ||
1647 | .import handle_interruption,code | |
1648 | ||
1649 | kernel_bad_space: | |
1650 | b intr_save | |
1651 | ldi 31,%r8 /* Use an unused code */ | |
1652 | ||
1653 | dbit_fault: | |
1654 | b intr_save | |
1655 | ldi 20,%r8 | |
1656 | ||
1657 | itlb_fault: | |
1658 | b intr_save | |
1659 | ldi 6,%r8 | |
1660 | ||
1661 | nadtlb_fault: | |
1662 | b intr_save | |
1663 | ldi 17,%r8 | |
1664 | ||
1665 | dtlb_fault: | |
1666 | b intr_save | |
1667 | ldi 15,%r8 | |
1668 | ||
1669 | /* Register saving semantics for system calls: | |
1670 | ||
1671 | %r1 clobbered by system call macro in userspace | |
1672 | %r2 saved in PT_REGS by gateway page | |
1673 | %r3 - %r18 preserved by C code (saved by signal code) | |
1674 | %r19 - %r20 saved in PT_REGS by gateway page | |
1675 | %r21 - %r22 non-standard syscall args | |
1676 | stored in kernel stack by gateway page | |
1677 | %r23 - %r26 arg3-arg0, saved in PT_REGS by gateway page | |
1678 | %r27 - %r30 saved in PT_REGS by gateway page | |
1679 | %r31 syscall return pointer | |
1680 | */ | |
1681 | ||
1682 | /* Floating point registers (FIXME: what do we do with these?) | |
1683 | ||
1684 | %fr0 - %fr3 status/exception, not preserved | |
1685 | %fr4 - %fr7 arguments | |
1686 | %fr8 - %fr11 not preserved by C code | |
1687 | %fr12 - %fr21 preserved by C code | |
1688 | %fr22 - %fr31 not preserved by C code | |
1689 | */ | |
1690 | ||
1691 | .macro reg_save regs | |
1692 | STREG %r3, PT_GR3(\regs) | |
1693 | STREG %r4, PT_GR4(\regs) | |
1694 | STREG %r5, PT_GR5(\regs) | |
1695 | STREG %r6, PT_GR6(\regs) | |
1696 | STREG %r7, PT_GR7(\regs) | |
1697 | STREG %r8, PT_GR8(\regs) | |
1698 | STREG %r9, PT_GR9(\regs) | |
1699 | STREG %r10,PT_GR10(\regs) | |
1700 | STREG %r11,PT_GR11(\regs) | |
1701 | STREG %r12,PT_GR12(\regs) | |
1702 | STREG %r13,PT_GR13(\regs) | |
1703 | STREG %r14,PT_GR14(\regs) | |
1704 | STREG %r15,PT_GR15(\regs) | |
1705 | STREG %r16,PT_GR16(\regs) | |
1706 | STREG %r17,PT_GR17(\regs) | |
1707 | STREG %r18,PT_GR18(\regs) | |
1708 | .endm | |
1709 | ||
1710 | .macro reg_restore regs | |
1711 | LDREG PT_GR3(\regs), %r3 | |
1712 | LDREG PT_GR4(\regs), %r4 | |
1713 | LDREG PT_GR5(\regs), %r5 | |
1714 | LDREG PT_GR6(\regs), %r6 | |
1715 | LDREG PT_GR7(\regs), %r7 | |
1716 | LDREG PT_GR8(\regs), %r8 | |
1717 | LDREG PT_GR9(\regs), %r9 | |
1718 | LDREG PT_GR10(\regs),%r10 | |
1719 | LDREG PT_GR11(\regs),%r11 | |
1720 | LDREG PT_GR12(\regs),%r12 | |
1721 | LDREG PT_GR13(\regs),%r13 | |
1722 | LDREG PT_GR14(\regs),%r14 | |
1723 | LDREG PT_GR15(\regs),%r15 | |
1724 | LDREG PT_GR16(\regs),%r16 | |
1725 | LDREG PT_GR17(\regs),%r17 | |
1726 | LDREG PT_GR18(\regs),%r18 | |
1727 | .endm | |
1728 | ||
c5e76552 | 1729 | ENTRY(sys_fork_wrapper) |
1da177e4 LT |
1730 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1 |
1731 | ldo TASK_REGS(%r1),%r1 | |
1732 | reg_save %r1 | |
1733 | mfctl %cr27, %r3 | |
1734 | STREG %r3, PT_CR27(%r1) | |
1735 | ||
1736 | STREG %r2,-RP_OFFSET(%r30) | |
1737 | ldo FRAME_SIZE(%r30),%r30 | |
413059f2 | 1738 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1739 | ldo -16(%r30),%r29 /* Reference param save area */ |
1740 | #endif | |
1741 | ||
1742 | /* These are call-clobbered registers and therefore | |
1743 | also syscall-clobbered (we hope). */ | |
1744 | STREG %r2,PT_GR19(%r1) /* save for child */ | |
1745 | STREG %r30,PT_GR21(%r1) | |
1746 | ||
1747 | LDREG PT_GR30(%r1),%r25 | |
1748 | copy %r1,%r24 | |
1749 | BL sys_clone,%r2 | |
1750 | ldi SIGCHLD,%r26 | |
1751 | ||
1752 | LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2 | |
1753 | wrapper_exit: | |
1754 | ldo -FRAME_SIZE(%r30),%r30 /* get the stackframe */ | |
1755 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 | |
1756 | ldo TASK_REGS(%r1),%r1 /* get pt regs */ | |
1757 | ||
1758 | LDREG PT_CR27(%r1), %r3 | |
1759 | mtctl %r3, %cr27 | |
1760 | reg_restore %r1 | |
1761 | ||
1762 | /* strace expects syscall # to be preserved in r20 */ | |
1763 | ldi __NR_fork,%r20 | |
1764 | bv %r0(%r2) | |
1765 | STREG %r20,PT_GR20(%r1) | |
c5e76552 | 1766 | ENDPROC(sys_fork_wrapper) |
1da177e4 LT |
1767 | |
1768 | /* Set the return value for the child */ | |
c5e76552 | 1769 | ENTRY(child_return) |
1da177e4 LT |
1770 | BL schedule_tail, %r2 |
1771 | nop | |
1772 | ||
1773 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1 | |
1774 | LDREG TASK_PT_GR19(%r1),%r2 | |
1775 | b wrapper_exit | |
1776 | copy %r0,%r28 | |
c5e76552 | 1777 | ENDPROC(child_return) |
1da177e4 | 1778 | |
c5e76552 HD |
1779 | |
1780 | ENTRY(sys_clone_wrapper) | |
1da177e4 LT |
1781 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 |
1782 | ldo TASK_REGS(%r1),%r1 /* get pt regs */ | |
1783 | reg_save %r1 | |
1784 | mfctl %cr27, %r3 | |
1785 | STREG %r3, PT_CR27(%r1) | |
1786 | ||
1787 | STREG %r2,-RP_OFFSET(%r30) | |
1788 | ldo FRAME_SIZE(%r30),%r30 | |
413059f2 | 1789 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1790 | ldo -16(%r30),%r29 /* Reference param save area */ |
1791 | #endif | |
1792 | ||
aa0eecb0 | 1793 | /* WARNING - Clobbers r19 and r21, userspace must save these! */ |
1da177e4 LT |
1794 | STREG %r2,PT_GR19(%r1) /* save for child */ |
1795 | STREG %r30,PT_GR21(%r1) | |
1796 | BL sys_clone,%r2 | |
1797 | copy %r1,%r24 | |
1798 | ||
1799 | b wrapper_exit | |
1800 | LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2 | |
c5e76552 | 1801 | ENDPROC(sys_clone_wrapper) |
1da177e4 | 1802 | |
c5e76552 HD |
1803 | |
1804 | ENTRY(sys_vfork_wrapper) | |
1da177e4 LT |
1805 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 |
1806 | ldo TASK_REGS(%r1),%r1 /* get pt regs */ | |
1807 | reg_save %r1 | |
1808 | mfctl %cr27, %r3 | |
1809 | STREG %r3, PT_CR27(%r1) | |
1810 | ||
1811 | STREG %r2,-RP_OFFSET(%r30) | |
1812 | ldo FRAME_SIZE(%r30),%r30 | |
413059f2 | 1813 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1814 | ldo -16(%r30),%r29 /* Reference param save area */ |
1815 | #endif | |
1816 | ||
1817 | STREG %r2,PT_GR19(%r1) /* save for child */ | |
1818 | STREG %r30,PT_GR21(%r1) | |
1819 | ||
1820 | BL sys_vfork,%r2 | |
1821 | copy %r1,%r26 | |
1822 | ||
1823 | b wrapper_exit | |
1824 | LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2 | |
c5e76552 | 1825 | ENDPROC(sys_vfork_wrapper) |
1da177e4 LT |
1826 | |
1827 | ||
1828 | .macro execve_wrapper execve | |
1829 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 | |
1830 | ldo TASK_REGS(%r1),%r1 /* get pt regs */ | |
1831 | ||
1832 | /* | |
1833 | * Do we need to save/restore r3-r18 here? | |
1834 | * I don't think so. why would new thread need old | |
1835 | * threads registers? | |
1836 | */ | |
1837 | ||
1838 | /* %arg0 - %arg3 are already saved for us. */ | |
1839 | ||
1840 | STREG %r2,-RP_OFFSET(%r30) | |
1841 | ldo FRAME_SIZE(%r30),%r30 | |
413059f2 | 1842 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1843 | ldo -16(%r30),%r29 /* Reference param save area */ |
1844 | #endif | |
99ac7947 | 1845 | BL \execve,%r2 |
1da177e4 LT |
1846 | copy %r1,%arg0 |
1847 | ||
1848 | ldo -FRAME_SIZE(%r30),%r30 | |
1849 | LDREG -RP_OFFSET(%r30),%r2 | |
1850 | ||
1851 | /* If exec succeeded we need to load the args */ | |
1852 | ||
1853 | ldo -1024(%r0),%r1 | |
1854 | cmpb,>>= %r28,%r1,error_\execve | |
1855 | copy %r2,%r19 | |
1856 | ||
1857 | error_\execve: | |
1858 | bv %r0(%r19) | |
1859 | nop | |
1860 | .endm | |
1861 | ||
1da177e4 | 1862 | .import sys_execve |
c5e76552 | 1863 | ENTRY(sys_execve_wrapper) |
1da177e4 | 1864 | execve_wrapper sys_execve |
c5e76552 | 1865 | ENDPROC(sys_execve_wrapper) |
1da177e4 | 1866 | |
413059f2 | 1867 | #ifdef CONFIG_64BIT |
1da177e4 | 1868 | .import sys32_execve |
c5e76552 | 1869 | ENTRY(sys32_execve_wrapper) |
1da177e4 | 1870 | execve_wrapper sys32_execve |
c5e76552 | 1871 | ENDPROC(sys32_execve_wrapper) |
1da177e4 LT |
1872 | #endif |
1873 | ||
c5e76552 | 1874 | ENTRY(sys_rt_sigreturn_wrapper) |
1da177e4 LT |
1875 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26 |
1876 | ldo TASK_REGS(%r26),%r26 /* get pt regs */ | |
1877 | /* Don't save regs, we are going to restore them from sigcontext. */ | |
1878 | STREG %r2, -RP_OFFSET(%r30) | |
413059f2 | 1879 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1880 | ldo FRAME_SIZE(%r30), %r30 |
1881 | BL sys_rt_sigreturn,%r2 | |
1882 | ldo -16(%r30),%r29 /* Reference param save area */ | |
1883 | #else | |
1884 | BL sys_rt_sigreturn,%r2 | |
1885 | ldo FRAME_SIZE(%r30), %r30 | |
1886 | #endif | |
1887 | ||
1888 | ldo -FRAME_SIZE(%r30), %r30 | |
1889 | LDREG -RP_OFFSET(%r30), %r2 | |
1890 | ||
1891 | /* FIXME: I think we need to restore a few more things here. */ | |
1892 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 | |
1893 | ldo TASK_REGS(%r1),%r1 /* get pt regs */ | |
1894 | reg_restore %r1 | |
1895 | ||
1896 | /* If the signal was received while the process was blocked on a | |
1897 | * syscall, then r2 will take us to syscall_exit; otherwise r2 will | |
1898 | * take us to syscall_exit_rfi and on to intr_return. | |
1899 | */ | |
1900 | bv %r0(%r2) | |
1901 | LDREG PT_GR28(%r1),%r28 /* reload original r28 for syscall_exit */ | |
c5e76552 | 1902 | ENDPROC(sys_rt_sigreturn_wrapper) |
1da177e4 | 1903 | |
c5e76552 | 1904 | ENTRY(sys_sigaltstack_wrapper) |
1da177e4 LT |
1905 | /* Get the user stack pointer */ |
1906 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 | |
1907 | ldo TASK_REGS(%r1),%r24 /* get pt regs */ | |
1908 | LDREG TASK_PT_GR30(%r24),%r24 | |
1909 | STREG %r2, -RP_OFFSET(%r30) | |
413059f2 | 1910 | #ifdef CONFIG_64BIT |
1da177e4 | 1911 | ldo FRAME_SIZE(%r30), %r30 |
df47b438 | 1912 | BL do_sigaltstack,%r2 |
1da177e4 LT |
1913 | ldo -16(%r30),%r29 /* Reference param save area */ |
1914 | #else | |
df47b438 | 1915 | BL do_sigaltstack,%r2 |
1da177e4 LT |
1916 | ldo FRAME_SIZE(%r30), %r30 |
1917 | #endif | |
1918 | ||
1919 | ldo -FRAME_SIZE(%r30), %r30 | |
1920 | LDREG -RP_OFFSET(%r30), %r2 | |
1921 | bv %r0(%r2) | |
1922 | nop | |
c5e76552 | 1923 | ENDPROC(sys_sigaltstack_wrapper) |
1da177e4 | 1924 | |
413059f2 | 1925 | #ifdef CONFIG_64BIT |
c5e76552 | 1926 | ENTRY(sys32_sigaltstack_wrapper) |
1da177e4 LT |
1927 | /* Get the user stack pointer */ |
1928 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r24 | |
1929 | LDREG TASK_PT_GR30(%r24),%r24 | |
1930 | STREG %r2, -RP_OFFSET(%r30) | |
1931 | ldo FRAME_SIZE(%r30), %r30 | |
df47b438 | 1932 | BL do_sigaltstack32,%r2 |
1da177e4 LT |
1933 | ldo -16(%r30),%r29 /* Reference param save area */ |
1934 | ||
1935 | ldo -FRAME_SIZE(%r30), %r30 | |
1936 | LDREG -RP_OFFSET(%r30), %r2 | |
1937 | bv %r0(%r2) | |
1938 | nop | |
c5e76552 | 1939 | ENDPROC(sys32_sigaltstack_wrapper) |
1da177e4 LT |
1940 | #endif |
1941 | ||
c5e76552 | 1942 | ENTRY(syscall_exit) |
1da177e4 LT |
1943 | /* NOTE: HP-UX syscalls also come through here |
1944 | * after hpux_syscall_exit fixes up return | |
1945 | * values. */ | |
1946 | ||
1947 | /* NOTE: Not all syscalls exit this way. rt_sigreturn will exit | |
1948 | * via syscall_exit_rfi if the signal was received while the process | |
1949 | * was running. | |
1950 | */ | |
1951 | ||
1952 | /* save return value now */ | |
1953 | ||
1954 | mfctl %cr30, %r1 | |
1955 | LDREG TI_TASK(%r1),%r1 | |
1956 | STREG %r28,TASK_PT_GR28(%r1) | |
1957 | ||
1958 | #ifdef CONFIG_HPUX | |
1da177e4 LT |
1959 | /* <linux/personality.h> cannot be easily included */ |
1960 | #define PER_HPUX 0x10 | |
376e210b | 1961 | ldw TASK_PERSONALITY(%r1),%r19 |
1da177e4 LT |
1962 | |
1963 | /* We can't use "CMPIB<> PER_HPUX" since "im5" field is sign extended */ | |
1964 | ldo -PER_HPUX(%r19), %r19 | |
872f6deb | 1965 | cmpib,COND(<>),n 0,%r19,1f |
1da177e4 LT |
1966 | |
1967 | /* Save other hpux returns if personality is PER_HPUX */ | |
1968 | STREG %r22,TASK_PT_GR22(%r1) | |
1969 | STREG %r29,TASK_PT_GR29(%r1) | |
1970 | 1: | |
1971 | ||
1972 | #endif /* CONFIG_HPUX */ | |
1973 | ||
1974 | /* Seems to me that dp could be wrong here, if the syscall involved | |
1975 | * calling a module, and nothing got round to restoring dp on return. | |
1976 | */ | |
1977 | loadgp | |
1978 | ||
1da177e4 LT |
1979 | syscall_check_resched: |
1980 | ||
1981 | /* check for reschedule */ | |
1982 | ||
1983 | LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* long */ | |
1984 | bb,<,n %r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */ | |
1985 | ||
4650f0a5 | 1986 | .import do_signal,code |
1da177e4 | 1987 | syscall_check_sig: |
4650f0a5 | 1988 | LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 |
3fe4c55e | 1989 | ldi (_TIF_SIGPENDING|_TIF_RESTORE_SIGMASK), %r26 |
4650f0a5 KM |
1990 | and,COND(<>) %r19, %r26, %r0 |
1991 | b,n syscall_restore /* skip past if we've nothing to do */ | |
1992 | ||
1993 | syscall_do_signal: | |
1994 | /* Save callee-save registers (for sigcontext). | |
1995 | * FIXME: After this point the process structure should be | |
1996 | * consistent with all the relevant state of the process | |
1997 | * before the syscall. We need to verify this. | |
1998 | */ | |
1999 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 | |
2000 | ldo TASK_REGS(%r1), %r26 /* struct pt_regs *regs */ | |
2001 | reg_save %r26 | |
2002 | ||
2003 | #ifdef CONFIG_64BIT | |
2004 | ldo -16(%r30),%r29 /* Reference param save area */ | |
2005 | #endif | |
2006 | ||
2007 | BL do_notify_resume,%r2 | |
2008 | ldi 1, %r25 /* long in_syscall = 1 */ | |
2009 | ||
2010 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 | |
2011 | ldo TASK_REGS(%r1), %r20 /* reload pt_regs */ | |
2012 | reg_restore %r20 | |
2013 | ||
2014 | b,n syscall_check_sig | |
1da177e4 LT |
2015 | |
2016 | syscall_restore: | |
1da177e4 LT |
2017 | LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 |
2018 | ||
ecd3d4bc KM |
2019 | /* Are we being ptraced? */ |
2020 | ldw TASK_FLAGS(%r1),%r19 | |
2021 | ldi (_TIF_SINGLESTEP|_TIF_BLOCKSTEP),%r2 | |
2022 | and,COND(=) %r19,%r2,%r0 | |
2023 | b,n syscall_restore_rfi | |
1da177e4 LT |
2024 | |
2025 | ldo TASK_PT_FR31(%r1),%r19 /* reload fpregs */ | |
2026 | rest_fp %r19 | |
2027 | ||
2028 | LDREG TASK_PT_SAR(%r1),%r19 /* restore SAR */ | |
2029 | mtsar %r19 | |
2030 | ||
2031 | LDREG TASK_PT_GR2(%r1),%r2 /* restore user rp */ | |
2032 | LDREG TASK_PT_GR19(%r1),%r19 | |
2033 | LDREG TASK_PT_GR20(%r1),%r20 | |
2034 | LDREG TASK_PT_GR21(%r1),%r21 | |
2035 | LDREG TASK_PT_GR22(%r1),%r22 | |
2036 | LDREG TASK_PT_GR23(%r1),%r23 | |
2037 | LDREG TASK_PT_GR24(%r1),%r24 | |
2038 | LDREG TASK_PT_GR25(%r1),%r25 | |
2039 | LDREG TASK_PT_GR26(%r1),%r26 | |
2040 | LDREG TASK_PT_GR27(%r1),%r27 /* restore user dp */ | |
2041 | LDREG TASK_PT_GR28(%r1),%r28 /* syscall return value */ | |
2042 | LDREG TASK_PT_GR29(%r1),%r29 | |
2043 | LDREG TASK_PT_GR31(%r1),%r31 /* restore syscall rp */ | |
2044 | ||
2045 | /* NOTE: We use rsm/ssm pair to make this operation atomic */ | |
8f6c0c2b | 2046 | LDREG TASK_PT_GR30(%r1),%r1 /* Get user sp */ |
1da177e4 | 2047 | rsm PSW_SM_I, %r0 |
8f6c0c2b JDA |
2048 | copy %r1,%r30 /* Restore user sp */ |
2049 | mfsp %sr3,%r1 /* Get user space id */ | |
1da177e4 LT |
2050 | mtsp %r1,%sr7 /* Restore sr7 */ |
2051 | ssm PSW_SM_I, %r0 | |
2052 | ||
2053 | /* Set sr2 to zero for userspace syscalls to work. */ | |
2054 | mtsp %r0,%sr2 | |
2055 | mtsp %r1,%sr4 /* Restore sr4 */ | |
2056 | mtsp %r1,%sr5 /* Restore sr5 */ | |
2057 | mtsp %r1,%sr6 /* Restore sr6 */ | |
2058 | ||
2059 | depi 3,31,2,%r31 /* ensure return to user mode. */ | |
2060 | ||
413059f2 | 2061 | #ifdef CONFIG_64BIT |
1da177e4 LT |
2062 | /* decide whether to reset the wide mode bit |
2063 | * | |
2064 | * For a syscall, the W bit is stored in the lowest bit | |
2065 | * of sp. Extract it and reset W if it is zero */ | |
2066 | extrd,u,*<> %r30,63,1,%r1 | |
2067 | rsm PSW_SM_W, %r0 | |
2068 | /* now reset the lowest bit of sp if it was set */ | |
2069 | xor %r30,%r1,%r30 | |
2070 | #endif | |
2071 | be,n 0(%sr3,%r31) /* return to user space */ | |
2072 | ||
2073 | /* We have to return via an RFI, so that PSW T and R bits can be set | |
2074 | * appropriately. | |
2075 | * This sets up pt_regs so we can return via intr_restore, which is not | |
2076 | * the most efficient way of doing things, but it works. | |
2077 | */ | |
2078 | syscall_restore_rfi: | |
2079 | ldo -1(%r0),%r2 /* Set recovery cntr to -1 */ | |
2080 | mtctl %r2,%cr0 /* for immediate trap */ | |
2081 | LDREG TASK_PT_PSW(%r1),%r2 /* Get old PSW */ | |
2082 | ldi 0x0b,%r20 /* Create new PSW */ | |
2083 | depi -1,13,1,%r20 /* C, Q, D, and I bits */ | |
2084 | ||
ecd3d4bc KM |
2085 | /* The values of SINGLESTEP_BIT and BLOCKSTEP_BIT are |
2086 | * set in thread_info.h and converted to PA bitmap | |
1da177e4 LT |
2087 | * numbers in asm-offsets.c */ |
2088 | ||
ecd3d4bc KM |
2089 | /* if ((%r19.SINGLESTEP_BIT)) { %r20.27=1} */ |
2090 | extru,= %r19,TIF_SINGLESTEP_PA_BIT,1,%r0 | |
1da177e4 LT |
2091 | depi -1,27,1,%r20 /* R bit */ |
2092 | ||
ecd3d4bc KM |
2093 | /* if ((%r19.BLOCKSTEP_BIT)) { %r20.7=1} */ |
2094 | extru,= %r19,TIF_BLOCKSTEP_PA_BIT,1,%r0 | |
1da177e4 LT |
2095 | depi -1,7,1,%r20 /* T bit */ |
2096 | ||
2097 | STREG %r20,TASK_PT_PSW(%r1) | |
2098 | ||
2099 | /* Always store space registers, since sr3 can be changed (e.g. fork) */ | |
2100 | ||
2101 | mfsp %sr3,%r25 | |
2102 | STREG %r25,TASK_PT_SR3(%r1) | |
2103 | STREG %r25,TASK_PT_SR4(%r1) | |
2104 | STREG %r25,TASK_PT_SR5(%r1) | |
2105 | STREG %r25,TASK_PT_SR6(%r1) | |
2106 | STREG %r25,TASK_PT_SR7(%r1) | |
2107 | STREG %r25,TASK_PT_IASQ0(%r1) | |
2108 | STREG %r25,TASK_PT_IASQ1(%r1) | |
2109 | ||
2110 | /* XXX W bit??? */ | |
2111 | /* Now if old D bit is clear, it means we didn't save all registers | |
2112 | * on syscall entry, so do that now. This only happens on TRACEME | |
2113 | * calls, or if someone attached to us while we were on a syscall. | |
2114 | * We could make this more efficient by not saving r3-r18, but | |
2115 | * then we wouldn't be able to use the common intr_restore path. | |
2116 | * It is only for traced processes anyway, so performance is not | |
2117 | * an issue. | |
2118 | */ | |
2119 | bb,< %r2,30,pt_regs_ok /* Branch if D set */ | |
2120 | ldo TASK_REGS(%r1),%r25 | |
2121 | reg_save %r25 /* Save r3 to r18 */ | |
2122 | ||
2123 | /* Save the current sr */ | |
2124 | mfsp %sr0,%r2 | |
2125 | STREG %r2,TASK_PT_SR0(%r1) | |
2126 | ||
2127 | /* Save the scratch sr */ | |
2128 | mfsp %sr1,%r2 | |
2129 | STREG %r2,TASK_PT_SR1(%r1) | |
2130 | ||
2131 | /* sr2 should be set to zero for userspace syscalls */ | |
2132 | STREG %r0,TASK_PT_SR2(%r1) | |
2133 | ||
2134 | pt_regs_ok: | |
2135 | LDREG TASK_PT_GR31(%r1),%r2 | |
2136 | depi 3,31,2,%r2 /* ensure return to user mode. */ | |
2137 | STREG %r2,TASK_PT_IAOQ0(%r1) | |
2138 | ldo 4(%r2),%r2 | |
2139 | STREG %r2,TASK_PT_IAOQ1(%r1) | |
2140 | copy %r25,%r16 | |
2141 | b intr_restore | |
2142 | nop | |
2143 | ||
1da177e4 LT |
2144 | .import schedule,code |
2145 | syscall_do_resched: | |
2146 | BL schedule,%r2 | |
413059f2 | 2147 | #ifdef CONFIG_64BIT |
1da177e4 LT |
2148 | ldo -16(%r30),%r29 /* Reference param save area */ |
2149 | #else | |
2150 | nop | |
2151 | #endif | |
72738a96 | 2152 | b syscall_check_resched /* if resched, we start over again */ |
1da177e4 | 2153 | nop |
c5e76552 | 2154 | ENDPROC(syscall_exit) |
1da177e4 | 2155 | |
c5e76552 | 2156 | |
d75f054a HD |
2157 | #ifdef CONFIG_FUNCTION_TRACER |
2158 | .import ftrace_function_trampoline,code | |
2159 | ENTRY(_mcount) | |
2160 | copy %r3, %arg2 | |
2161 | b ftrace_function_trampoline | |
2162 | nop | |
2163 | ENDPROC(_mcount) | |
2164 | ||
2165 | ENTRY(return_to_handler) | |
2166 | load32 return_trampoline, %rp | |
2167 | copy %ret0, %arg0 | |
2168 | copy %ret1, %arg1 | |
2169 | b ftrace_return_to_handler | |
2170 | nop | |
2171 | return_trampoline: | |
2172 | copy %ret0, %rp | |
2173 | copy %r23, %ret0 | |
2174 | copy %r24, %ret1 | |
2175 | ||
2176 | .globl ftrace_stub | |
2177 | ftrace_stub: | |
2178 | bv %r0(%rp) | |
2179 | nop | |
2180 | ENDPROC(return_to_handler) | |
2181 | #endif /* CONFIG_FUNCTION_TRACER */ | |
2182 | ||
2183 | ||
bcc0e04c | 2184 | get_register: |
1da177e4 LT |
2185 | /* |
2186 | * get_register is used by the non access tlb miss handlers to | |
2187 | * copy the value of the general register specified in r8 into | |
2188 | * r1. This routine can't be used for shadowed registers, since | |
2189 | * the rfir will restore the original value. So, for the shadowed | |
2190 | * registers we put a -1 into r1 to indicate that the register | |
2191 | * should not be used (the register being copied could also have | |
2192 | * a -1 in it, but that is OK, it just means that we will have | |
2193 | * to use the slow path instead). | |
2194 | */ | |
1da177e4 LT |
2195 | blr %r8,%r0 |
2196 | nop | |
2197 | bv %r0(%r25) /* r0 */ | |
2198 | copy %r0,%r1 | |
2199 | bv %r0(%r25) /* r1 - shadowed */ | |
2200 | ldi -1,%r1 | |
2201 | bv %r0(%r25) /* r2 */ | |
2202 | copy %r2,%r1 | |
2203 | bv %r0(%r25) /* r3 */ | |
2204 | copy %r3,%r1 | |
2205 | bv %r0(%r25) /* r4 */ | |
2206 | copy %r4,%r1 | |
2207 | bv %r0(%r25) /* r5 */ | |
2208 | copy %r5,%r1 | |
2209 | bv %r0(%r25) /* r6 */ | |
2210 | copy %r6,%r1 | |
2211 | bv %r0(%r25) /* r7 */ | |
2212 | copy %r7,%r1 | |
2213 | bv %r0(%r25) /* r8 - shadowed */ | |
2214 | ldi -1,%r1 | |
2215 | bv %r0(%r25) /* r9 - shadowed */ | |
2216 | ldi -1,%r1 | |
2217 | bv %r0(%r25) /* r10 */ | |
2218 | copy %r10,%r1 | |
2219 | bv %r0(%r25) /* r11 */ | |
2220 | copy %r11,%r1 | |
2221 | bv %r0(%r25) /* r12 */ | |
2222 | copy %r12,%r1 | |
2223 | bv %r0(%r25) /* r13 */ | |
2224 | copy %r13,%r1 | |
2225 | bv %r0(%r25) /* r14 */ | |
2226 | copy %r14,%r1 | |
2227 | bv %r0(%r25) /* r15 */ | |
2228 | copy %r15,%r1 | |
2229 | bv %r0(%r25) /* r16 - shadowed */ | |
2230 | ldi -1,%r1 | |
2231 | bv %r0(%r25) /* r17 - shadowed */ | |
2232 | ldi -1,%r1 | |
2233 | bv %r0(%r25) /* r18 */ | |
2234 | copy %r18,%r1 | |
2235 | bv %r0(%r25) /* r19 */ | |
2236 | copy %r19,%r1 | |
2237 | bv %r0(%r25) /* r20 */ | |
2238 | copy %r20,%r1 | |
2239 | bv %r0(%r25) /* r21 */ | |
2240 | copy %r21,%r1 | |
2241 | bv %r0(%r25) /* r22 */ | |
2242 | copy %r22,%r1 | |
2243 | bv %r0(%r25) /* r23 */ | |
2244 | copy %r23,%r1 | |
2245 | bv %r0(%r25) /* r24 - shadowed */ | |
2246 | ldi -1,%r1 | |
2247 | bv %r0(%r25) /* r25 - shadowed */ | |
2248 | ldi -1,%r1 | |
2249 | bv %r0(%r25) /* r26 */ | |
2250 | copy %r26,%r1 | |
2251 | bv %r0(%r25) /* r27 */ | |
2252 | copy %r27,%r1 | |
2253 | bv %r0(%r25) /* r28 */ | |
2254 | copy %r28,%r1 | |
2255 | bv %r0(%r25) /* r29 */ | |
2256 | copy %r29,%r1 | |
2257 | bv %r0(%r25) /* r30 */ | |
2258 | copy %r30,%r1 | |
2259 | bv %r0(%r25) /* r31 */ | |
2260 | copy %r31,%r1 | |
2261 | ||
c5e76552 | 2262 | |
bcc0e04c | 2263 | set_register: |
1da177e4 LT |
2264 | /* |
2265 | * set_register is used by the non access tlb miss handlers to | |
2266 | * copy the value of r1 into the general register specified in | |
2267 | * r8. | |
2268 | */ | |
1da177e4 LT |
2269 | blr %r8,%r0 |
2270 | nop | |
2271 | bv %r0(%r25) /* r0 (silly, but it is a place holder) */ | |
2272 | copy %r1,%r0 | |
2273 | bv %r0(%r25) /* r1 */ | |
2274 | copy %r1,%r1 | |
2275 | bv %r0(%r25) /* r2 */ | |
2276 | copy %r1,%r2 | |
2277 | bv %r0(%r25) /* r3 */ | |
2278 | copy %r1,%r3 | |
2279 | bv %r0(%r25) /* r4 */ | |
2280 | copy %r1,%r4 | |
2281 | bv %r0(%r25) /* r5 */ | |
2282 | copy %r1,%r5 | |
2283 | bv %r0(%r25) /* r6 */ | |
2284 | copy %r1,%r6 | |
2285 | bv %r0(%r25) /* r7 */ | |
2286 | copy %r1,%r7 | |
2287 | bv %r0(%r25) /* r8 */ | |
2288 | copy %r1,%r8 | |
2289 | bv %r0(%r25) /* r9 */ | |
2290 | copy %r1,%r9 | |
2291 | bv %r0(%r25) /* r10 */ | |
2292 | copy %r1,%r10 | |
2293 | bv %r0(%r25) /* r11 */ | |
2294 | copy %r1,%r11 | |
2295 | bv %r0(%r25) /* r12 */ | |
2296 | copy %r1,%r12 | |
2297 | bv %r0(%r25) /* r13 */ | |
2298 | copy %r1,%r13 | |
2299 | bv %r0(%r25) /* r14 */ | |
2300 | copy %r1,%r14 | |
2301 | bv %r0(%r25) /* r15 */ | |
2302 | copy %r1,%r15 | |
2303 | bv %r0(%r25) /* r16 */ | |
2304 | copy %r1,%r16 | |
2305 | bv %r0(%r25) /* r17 */ | |
2306 | copy %r1,%r17 | |
2307 | bv %r0(%r25) /* r18 */ | |
2308 | copy %r1,%r18 | |
2309 | bv %r0(%r25) /* r19 */ | |
2310 | copy %r1,%r19 | |
2311 | bv %r0(%r25) /* r20 */ | |
2312 | copy %r1,%r20 | |
2313 | bv %r0(%r25) /* r21 */ | |
2314 | copy %r1,%r21 | |
2315 | bv %r0(%r25) /* r22 */ | |
2316 | copy %r1,%r22 | |
2317 | bv %r0(%r25) /* r23 */ | |
2318 | copy %r1,%r23 | |
2319 | bv %r0(%r25) /* r24 */ | |
2320 | copy %r1,%r24 | |
2321 | bv %r0(%r25) /* r25 */ | |
2322 | copy %r1,%r25 | |
2323 | bv %r0(%r25) /* r26 */ | |
2324 | copy %r1,%r26 | |
2325 | bv %r0(%r25) /* r27 */ | |
2326 | copy %r1,%r27 | |
2327 | bv %r0(%r25) /* r28 */ | |
2328 | copy %r1,%r28 | |
2329 | bv %r0(%r25) /* r29 */ | |
2330 | copy %r1,%r29 | |
2331 | bv %r0(%r25) /* r30 */ | |
2332 | copy %r1,%r30 | |
2333 | bv %r0(%r25) /* r31 */ | |
2334 | copy %r1,%r31 | |
c5e76552 | 2335 |