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1da177e4 LT |
1 | /* $Id: process.c,v 1.131 2002/02/09 19:49:30 davem Exp $ |
2 | * arch/sparc64/kernel/process.c | |
3 | * | |
4 | * Copyright (C) 1995, 1996 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) | |
6 | * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This file handles the architecture-dependent parts of process handling.. | |
11 | */ | |
12 | ||
13 | #include <stdarg.h> | |
14 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/kallsyms.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/smp_lock.h> | |
24 | #include <linux/stddef.h> | |
25 | #include <linux/ptrace.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/user.h> | |
28 | #include <linux/a.out.h> | |
29 | #include <linux/config.h> | |
30 | #include <linux/reboot.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/compat.h> | |
33 | #include <linux/init.h> | |
34 | ||
35 | #include <asm/oplib.h> | |
36 | #include <asm/uaccess.h> | |
37 | #include <asm/system.h> | |
38 | #include <asm/page.h> | |
39 | #include <asm/pgalloc.h> | |
40 | #include <asm/pgtable.h> | |
41 | #include <asm/processor.h> | |
42 | #include <asm/pstate.h> | |
43 | #include <asm/elf.h> | |
44 | #include <asm/fpumacro.h> | |
45 | #include <asm/head.h> | |
46 | #include <asm/cpudata.h> | |
47 | #include <asm/unistd.h> | |
48 | ||
49 | /* #define VERBOSE_SHOWREGS */ | |
50 | ||
51 | /* | |
52 | * Nothing special yet... | |
53 | */ | |
54 | void default_idle(void) | |
55 | { | |
56 | } | |
57 | ||
58 | #ifndef CONFIG_SMP | |
59 | ||
60 | /* | |
61 | * the idle loop on a Sparc... ;) | |
62 | */ | |
63 | void cpu_idle(void) | |
64 | { | |
1da177e4 LT |
65 | /* endless idle loop with no priority at all */ |
66 | for (;;) { | |
67 | /* If current->work.need_resched is zero we should really | |
68 | * setup for a system wakup event and execute a shutdown | |
69 | * instruction. | |
70 | * | |
71 | * But this requires writing back the contents of the | |
72 | * L2 cache etc. so implement this later. -DaveM | |
73 | */ | |
74 | while (!need_resched()) | |
75 | barrier(); | |
76 | ||
5bfb5d69 | 77 | preempt_enable_no_resched(); |
1da177e4 | 78 | schedule(); |
5bfb5d69 | 79 | preempt_disable(); |
1da177e4 LT |
80 | check_pgt_cache(); |
81 | } | |
1da177e4 LT |
82 | } |
83 | ||
84 | #else | |
85 | ||
86 | /* | |
87 | * the idle loop on a UltraMultiPenguin... | |
64c7c8f8 NP |
88 | * |
89 | * TIF_POLLING_NRFLAG is set because we do not sleep the cpu | |
90 | * inside of the idler task, so an interrupt is not needed | |
91 | * to get a clean fast response. | |
92 | * | |
93 | * XXX Reverify this assumption... -DaveM | |
94 | * | |
95 | * Addendum: We do want it to do something for the signal | |
96 | * delivery case, we detect that by just seeing | |
97 | * if we are trying to send this to an idler or not. | |
1da177e4 | 98 | */ |
1da177e4 LT |
99 | void cpu_idle(void) |
100 | { | |
64c7c8f8 | 101 | cpuinfo_sparc *cpuinfo = &local_cpu_data(); |
1da177e4 | 102 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 | 103 | |
1da177e4 LT |
104 | while(1) { |
105 | if (need_resched()) { | |
64c7c8f8 | 106 | cpuinfo->idle_volume = 0; |
5bfb5d69 | 107 | preempt_enable_no_resched(); |
1da177e4 | 108 | schedule(); |
5bfb5d69 | 109 | preempt_disable(); |
1da177e4 LT |
110 | check_pgt_cache(); |
111 | } | |
64c7c8f8 | 112 | cpuinfo->idle_volume++; |
1da177e4 LT |
113 | |
114 | /* The store ordering is so that IRQ handlers on | |
115 | * other cpus see our increasing idleness for the buddy | |
116 | * redistribution algorithm. -DaveM | |
117 | */ | |
4f07118f | 118 | membar_storeload_storestore(); |
1da177e4 LT |
119 | } |
120 | } | |
121 | ||
122 | #endif | |
123 | ||
124 | extern char reboot_command []; | |
125 | ||
126 | extern void (*prom_palette)(int); | |
127 | extern void (*prom_keyboard)(void); | |
128 | ||
129 | void machine_halt(void) | |
130 | { | |
131 | if (!serial_console && prom_palette) | |
132 | prom_palette (1); | |
133 | if (prom_keyboard) | |
134 | prom_keyboard(); | |
135 | prom_halt(); | |
136 | panic("Halt failed!"); | |
137 | } | |
138 | ||
1da177e4 LT |
139 | void machine_alt_power_off(void) |
140 | { | |
141 | if (!serial_console && prom_palette) | |
142 | prom_palette(1); | |
143 | if (prom_keyboard) | |
144 | prom_keyboard(); | |
145 | prom_halt_power_off(); | |
146 | panic("Power-off failed!"); | |
147 | } | |
148 | ||
149 | void machine_restart(char * cmd) | |
150 | { | |
151 | char *p; | |
152 | ||
153 | p = strchr (reboot_command, '\n'); | |
154 | if (p) *p = 0; | |
155 | if (!serial_console && prom_palette) | |
156 | prom_palette (1); | |
157 | if (prom_keyboard) | |
158 | prom_keyboard(); | |
159 | if (cmd) | |
160 | prom_reboot(cmd); | |
161 | if (*reboot_command) | |
162 | prom_reboot(reboot_command); | |
163 | prom_reboot(""); | |
164 | panic("Reboot failed!"); | |
165 | } | |
166 | ||
1da177e4 LT |
167 | static void show_regwindow32(struct pt_regs *regs) |
168 | { | |
169 | struct reg_window32 __user *rw; | |
170 | struct reg_window32 r_w; | |
171 | mm_segment_t old_fs; | |
172 | ||
173 | __asm__ __volatile__ ("flushw"); | |
174 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
175 | old_fs = get_fs(); | |
176 | set_fs (USER_DS); | |
177 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
178 | set_fs (old_fs); | |
179 | return; | |
180 | } | |
181 | ||
182 | set_fs (old_fs); | |
183 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
184 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
185 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
186 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
187 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
188 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
189 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
190 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
191 | } | |
192 | ||
193 | static void show_regwindow(struct pt_regs *regs) | |
194 | { | |
195 | struct reg_window __user *rw; | |
196 | struct reg_window *rwk; | |
197 | struct reg_window r_w; | |
198 | mm_segment_t old_fs; | |
199 | ||
200 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
201 | __asm__ __volatile__ ("flushw"); | |
202 | rw = (struct reg_window __user *) | |
203 | (regs->u_regs[14] + STACK_BIAS); | |
204 | rwk = (struct reg_window *) | |
205 | (regs->u_regs[14] + STACK_BIAS); | |
206 | if (!(regs->tstate & TSTATE_PRIV)) { | |
207 | old_fs = get_fs(); | |
208 | set_fs (USER_DS); | |
209 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
210 | set_fs (old_fs); | |
211 | return; | |
212 | } | |
213 | rwk = &r_w; | |
214 | set_fs (old_fs); | |
215 | } | |
216 | } else { | |
217 | show_regwindow32(regs); | |
218 | return; | |
219 | } | |
220 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
221 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
222 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
223 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
224 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
225 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
226 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
227 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
228 | if (regs->tstate & TSTATE_PRIV) | |
229 | print_symbol("I7: <%s>\n", rwk->ins[7]); | |
230 | } | |
231 | ||
232 | void show_stackframe(struct sparc_stackf *sf) | |
233 | { | |
234 | unsigned long size; | |
235 | unsigned long *stk; | |
236 | int i; | |
237 | ||
238 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n" | |
239 | "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
240 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3], | |
241 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
242 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n" | |
243 | "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n", | |
244 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3], | |
245 | sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc); | |
246 | printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n" | |
247 | "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n", | |
248 | (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1], | |
249 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
250 | sf->xxargs[0]); | |
251 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
252 | size -= STACKFRAME_SZ; | |
253 | stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ); | |
254 | i = 0; | |
255 | do { | |
256 | printk("s%d: %016lx\n", i++, *stk++); | |
257 | } while ((size -= sizeof(unsigned long))); | |
258 | } | |
259 | ||
260 | void show_stackframe32(struct sparc_stackf32 *sf) | |
261 | { | |
262 | unsigned long size; | |
263 | unsigned *stk; | |
264 | int i; | |
265 | ||
266 | printk("l0: %08x l1: %08x l2: %08x l3: %08x\n", | |
267 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]); | |
268 | printk("l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
269 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
270 | printk("i0: %08x i1: %08x i2: %08x i3: %08x\n", | |
271 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]); | |
272 | printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n", | |
273 | sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc); | |
274 | printk("sp: %08x x0: %08x x1: %08x x2: %08x\n" | |
275 | "x3: %08x x4: %08x x5: %08x xx: %08x\n", | |
276 | sf->structptr, sf->xargs[0], sf->xargs[1], | |
277 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
278 | sf->xxargs[0]); | |
279 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
280 | size -= STACKFRAME32_SZ; | |
281 | stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ); | |
282 | i = 0; | |
283 | do { | |
284 | printk("s%d: %08x\n", i++, *stk++); | |
285 | } while ((size -= sizeof(unsigned))); | |
286 | } | |
287 | ||
288 | #ifdef CONFIG_SMP | |
289 | static DEFINE_SPINLOCK(regdump_lock); | |
290 | #endif | |
291 | ||
292 | void __show_regs(struct pt_regs * regs) | |
293 | { | |
294 | #ifdef CONFIG_SMP | |
295 | unsigned long flags; | |
296 | ||
297 | /* Protect against xcall ipis which might lead to livelock on the lock */ | |
298 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" | |
299 | "wrpr %0, %1, %%pstate" | |
300 | : "=r" (flags) | |
301 | : "i" (PSTATE_IE)); | |
302 | spin_lock(®dump_lock); | |
303 | #endif | |
304 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, | |
305 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
306 | print_symbol("TPC: <%s>\n", regs->tpc); | |
307 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", | |
308 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
309 | regs->u_regs[3]); | |
310 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
311 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
312 | regs->u_regs[7]); | |
313 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
314 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
315 | regs->u_regs[11]); | |
316 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
317 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
318 | regs->u_regs[15]); | |
319 | print_symbol("RPC: <%s>\n", regs->u_regs[15]); | |
320 | show_regwindow(regs); | |
321 | #ifdef CONFIG_SMP | |
322 | spin_unlock(®dump_lock); | |
323 | __asm__ __volatile__("wrpr %0, 0, %%pstate" | |
324 | : : "r" (flags)); | |
325 | #endif | |
326 | } | |
327 | ||
328 | #ifdef VERBOSE_SHOWREGS | |
329 | static void idump_from_user (unsigned int *pc) | |
330 | { | |
331 | int i; | |
332 | int code; | |
333 | ||
334 | if((((unsigned long) pc) & 3)) | |
335 | return; | |
336 | ||
337 | pc -= 3; | |
338 | for(i = -3; i < 6; i++) { | |
339 | get_user(code, pc); | |
340 | printk("%c%08x%c",i?' ':'<',code,i?' ':'>'); | |
341 | pc++; | |
342 | } | |
343 | printk("\n"); | |
344 | } | |
345 | #endif | |
346 | ||
347 | void show_regs(struct pt_regs *regs) | |
348 | { | |
349 | #ifdef VERBOSE_SHOWREGS | |
350 | extern long etrap, etraptl1; | |
351 | #endif | |
352 | __show_regs(regs); | |
353 | #ifdef CONFIG_SMP | |
354 | { | |
355 | extern void smp_report_regs(void); | |
356 | ||
357 | smp_report_regs(); | |
358 | } | |
359 | #endif | |
360 | ||
361 | #ifdef VERBOSE_SHOWREGS | |
362 | if (regs->tpc >= &etrap && regs->tpc < &etraptl1 && | |
363 | regs->u_regs[14] >= (long)current - PAGE_SIZE && | |
364 | regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) { | |
365 | printk ("*********parent**********\n"); | |
366 | __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF)); | |
367 | idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc); | |
368 | printk ("*********endpar**********\n"); | |
369 | } | |
370 | #endif | |
371 | } | |
372 | ||
373 | void show_regs32(struct pt_regs32 *regs) | |
374 | { | |
375 | printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr, | |
376 | regs->pc, regs->npc, regs->y, print_tainted()); | |
377 | printk("g0: %08x g1: %08x g2: %08x g3: %08x ", | |
378 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
379 | regs->u_regs[3]); | |
380 | printk("g4: %08x g5: %08x g6: %08x g7: %08x\n", | |
381 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
382 | regs->u_regs[7]); | |
383 | printk("o0: %08x o1: %08x o2: %08x o3: %08x ", | |
384 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
385 | regs->u_regs[11]); | |
386 | printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n", | |
387 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
388 | regs->u_regs[15]); | |
389 | } | |
390 | ||
391 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
392 | { | |
393 | struct thread_info *ti = tsk->thread_info; | |
394 | unsigned long ret = 0xdeadbeefUL; | |
395 | ||
396 | if (ti && ti->ksp) { | |
397 | unsigned long *sp; | |
398 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
399 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
400 | sp[14]) { | |
401 | unsigned long *fp; | |
402 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
403 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
404 | ret = fp[15]; | |
405 | } | |
406 | } | |
407 | return ret; | |
408 | } | |
409 | ||
410 | /* Free current thread data structures etc.. */ | |
411 | void exit_thread(void) | |
412 | { | |
413 | struct thread_info *t = current_thread_info(); | |
414 | ||
415 | if (t->utraps) { | |
416 | if (t->utraps[0] < 2) | |
417 | kfree (t->utraps); | |
418 | else | |
419 | t->utraps[0]--; | |
420 | } | |
421 | ||
422 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
423 | t->user_cntd0 = t->user_cntd1 = NULL; | |
424 | t->pcr_reg = 0; | |
425 | write_pcr(0); | |
426 | } | |
427 | } | |
428 | ||
429 | void flush_thread(void) | |
430 | { | |
431 | struct thread_info *t = current_thread_info(); | |
432 | ||
433 | if (t->flags & _TIF_ABI_PENDING) | |
434 | t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT); | |
435 | ||
436 | if (t->task->mm) { | |
437 | unsigned long pgd_cache = 0UL; | |
438 | if (test_thread_flag(TIF_32BIT)) { | |
439 | struct mm_struct *mm = t->task->mm; | |
440 | pgd_t *pgd0 = &mm->pgd[0]; | |
441 | pud_t *pud0 = pud_offset(pgd0, 0); | |
442 | ||
443 | if (pud_none(*pud0)) { | |
444 | pmd_t *page = pmd_alloc_one(mm, 0); | |
445 | pud_set(pud0, page); | |
446 | } | |
447 | pgd_cache = get_pgd_cache(pgd0); | |
448 | } | |
449 | __asm__ __volatile__("stxa %0, [%1] %2\n\t" | |
450 | "membar #Sync" | |
451 | : /* no outputs */ | |
452 | : "r" (pgd_cache), | |
453 | "r" (TSB_REG), | |
454 | "i" (ASI_DMMU)); | |
455 | } | |
456 | set_thread_wsaved(0); | |
457 | ||
458 | /* Turn off performance counters if on. */ | |
459 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
460 | t->user_cntd0 = t->user_cntd1 = NULL; | |
461 | t->pcr_reg = 0; | |
462 | write_pcr(0); | |
463 | } | |
464 | ||
465 | /* Clear FPU register state. */ | |
466 | t->fpsaved[0] = 0; | |
467 | ||
468 | if (get_thread_current_ds() != ASI_AIUS) | |
469 | set_fs(USER_DS); | |
470 | ||
471 | /* Init new signal delivery disposition. */ | |
472 | clear_thread_flag(TIF_NEWSIGNALS); | |
473 | } | |
474 | ||
475 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
476 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
477 | { | |
478 | unsigned long fp, distance, rval; | |
479 | ||
480 | if (!(test_thread_flag(TIF_32BIT))) { | |
481 | csp += STACK_BIAS; | |
482 | psp += STACK_BIAS; | |
483 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
484 | fp += STACK_BIAS; | |
485 | } else | |
486 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
487 | ||
488 | /* Now 8-byte align the stack as this is mandatory in the | |
489 | * Sparc ABI due to how register windows work. This hides | |
490 | * the restriction from thread libraries etc. -DaveM | |
491 | */ | |
492 | csp &= ~7UL; | |
493 | ||
494 | distance = fp - psp; | |
495 | rval = (csp - distance); | |
496 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
497 | rval = 0; | |
498 | else if (test_thread_flag(TIF_32BIT)) { | |
499 | if (put_user(((u32)csp), | |
500 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
501 | rval = 0; | |
502 | } else { | |
503 | if (put_user(((u64)csp - STACK_BIAS), | |
504 | &(((struct reg_window __user *)rval)->ins[6]))) | |
505 | rval = 0; | |
506 | else | |
507 | rval = rval - STACK_BIAS; | |
508 | } | |
509 | ||
510 | return rval; | |
511 | } | |
512 | ||
513 | /* Standard stuff. */ | |
514 | static inline void shift_window_buffer(int first_win, int last_win, | |
515 | struct thread_info *t) | |
516 | { | |
517 | int i; | |
518 | ||
519 | for (i = first_win; i < last_win; i++) { | |
520 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
521 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
522 | sizeof(struct reg_window)); | |
523 | } | |
524 | } | |
525 | ||
526 | void synchronize_user_stack(void) | |
527 | { | |
528 | struct thread_info *t = current_thread_info(); | |
529 | unsigned long window; | |
530 | ||
531 | flush_user_windows(); | |
532 | if ((window = get_thread_wsaved()) != 0) { | |
533 | int winsize = sizeof(struct reg_window); | |
534 | int bias = 0; | |
535 | ||
536 | if (test_thread_flag(TIF_32BIT)) | |
537 | winsize = sizeof(struct reg_window32); | |
538 | else | |
539 | bias = STACK_BIAS; | |
540 | ||
541 | window -= 1; | |
542 | do { | |
543 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
544 | struct reg_window *rwin = &t->reg_window[window]; | |
545 | ||
546 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
547 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
548 | set_thread_wsaved(get_thread_wsaved() - 1); | |
549 | } | |
550 | } while (window--); | |
551 | } | |
552 | } | |
553 | ||
554 | void fault_in_user_windows(void) | |
555 | { | |
556 | struct thread_info *t = current_thread_info(); | |
557 | unsigned long window; | |
558 | int winsize = sizeof(struct reg_window); | |
559 | int bias = 0; | |
560 | ||
561 | if (test_thread_flag(TIF_32BIT)) | |
562 | winsize = sizeof(struct reg_window32); | |
563 | else | |
564 | bias = STACK_BIAS; | |
565 | ||
566 | flush_user_windows(); | |
567 | window = get_thread_wsaved(); | |
568 | ||
569 | if (window != 0) { | |
570 | window -= 1; | |
571 | do { | |
572 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
573 | struct reg_window *rwin = &t->reg_window[window]; | |
574 | ||
575 | if (copy_to_user((char __user *)sp, rwin, winsize)) | |
576 | goto barf; | |
577 | } while (window--); | |
578 | } | |
579 | set_thread_wsaved(0); | |
580 | return; | |
581 | ||
582 | barf: | |
583 | set_thread_wsaved(window + 1); | |
584 | do_exit(SIGILL); | |
585 | } | |
586 | ||
587 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
588 | unsigned long stack_start, | |
589 | struct pt_regs *regs, | |
590 | unsigned long stack_size) | |
591 | { | |
592 | int __user *parent_tid_ptr, *child_tid_ptr; | |
593 | ||
594 | #ifdef CONFIG_COMPAT | |
595 | if (test_thread_flag(TIF_32BIT)) { | |
596 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
597 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
598 | } else | |
599 | #endif | |
600 | { | |
601 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
602 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
603 | } | |
604 | ||
605 | return do_fork(clone_flags, stack_start, | |
606 | regs, stack_size, | |
607 | parent_tid_ptr, child_tid_ptr); | |
608 | } | |
609 | ||
610 | /* Copy a Sparc thread. The fork() return value conventions | |
611 | * under SunOS are nothing short of bletcherous: | |
612 | * Parent --> %o0 == childs pid, %o1 == 0 | |
613 | * Child --> %o0 == parents pid, %o1 == 1 | |
614 | */ | |
615 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
616 | unsigned long unused, | |
617 | struct task_struct *p, struct pt_regs *regs) | |
618 | { | |
619 | struct thread_info *t = p->thread_info; | |
620 | char *child_trap_frame; | |
621 | ||
1da177e4 LT |
622 | /* Calculate offset to stack_frame & pt_regs */ |
623 | child_trap_frame = ((char *)t) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ)); | |
624 | memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ)); | |
625 | ||
626 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 627 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 628 | t->new_child = 1; |
1da177e4 LT |
629 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
630 | t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf)); | |
631 | t->fpsaved[0] = 0; | |
632 | ||
633 | if (regs->tstate & TSTATE_PRIV) { | |
634 | /* Special case, if we are spawning a kernel thread from | |
635 | * a userspace task (via KMOD, NFS, or similar) we must | |
636 | * disable performance counters in the child because the | |
637 | * address space and protection realm are changing. | |
638 | */ | |
639 | if (t->flags & _TIF_PERFCTR) { | |
640 | t->user_cntd0 = t->user_cntd1 = NULL; | |
641 | t->pcr_reg = 0; | |
642 | t->flags &= ~_TIF_PERFCTR; | |
643 | } | |
644 | t->kregs->u_regs[UREG_FP] = t->ksp; | |
645 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); | |
646 | flush_register_windows(); | |
647 | memcpy((void *)(t->ksp + STACK_BIAS), | |
648 | (void *)(regs->u_regs[UREG_FP] + STACK_BIAS), | |
649 | sizeof(struct sparc_stackf)); | |
650 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; | |
651 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
652 | } else { | |
653 | if (t->flags & _TIF_32BIT) { | |
654 | sp &= 0x00000000ffffffffUL; | |
655 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
656 | } | |
657 | t->kregs->u_regs[UREG_FP] = sp; | |
658 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
659 | if (sp != regs->u_regs[UREG_FP]) { | |
660 | unsigned long csp; | |
661 | ||
662 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
663 | if (!csp) | |
664 | return -EFAULT; | |
665 | t->kregs->u_regs[UREG_FP] = csp; | |
666 | } | |
667 | if (t->utraps) | |
668 | t->utraps[0]++; | |
669 | } | |
670 | ||
671 | /* Set the return value for the child. */ | |
672 | t->kregs->u_regs[UREG_I0] = current->pid; | |
673 | t->kregs->u_regs[UREG_I1] = 1; | |
674 | ||
675 | /* Set the second return value for the parent. */ | |
676 | regs->u_regs[UREG_I1] = 0; | |
677 | ||
678 | if (clone_flags & CLONE_SETTLS) | |
679 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | /* | |
685 | * This is the mechanism for creating a new kernel thread. | |
686 | * | |
687 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
688 | * who haven't done an "execve()") should use this: it will work within | |
689 | * a system call from a "real" process, but the process memory space will | |
690 | * not be free'd until both the parent and the child have exited. | |
691 | */ | |
692 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
693 | { | |
694 | long retval; | |
695 | ||
696 | /* If the parent runs before fn(arg) is called by the child, | |
697 | * the input registers of this function can be clobbered. | |
698 | * So we stash 'fn' and 'arg' into global registers which | |
699 | * will not be modified by the parent. | |
700 | */ | |
701 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
702 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
703 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
704 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
705 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
706 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
707 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
708 | " mov %%o0, %0\n\t" | |
709 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
710 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
711 | "mov %3, %%g1\n\t" | |
712 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
713 | /* Notreached by child. */ | |
714 | "1:" : | |
715 | "=r" (retval) : | |
716 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
717 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
718 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
719 | return retval; | |
720 | } | |
721 | ||
722 | /* | |
723 | * fill in the user structure for a core dump.. | |
724 | */ | |
725 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
726 | { | |
727 | /* Only should be used for SunOS and ancient a.out | |
728 | * SparcLinux binaries... Not worth implementing. | |
729 | */ | |
730 | memset(dump, 0, sizeof(struct user)); | |
731 | } | |
732 | ||
733 | typedef struct { | |
734 | union { | |
735 | unsigned int pr_regs[32]; | |
736 | unsigned long pr_dregs[16]; | |
737 | } pr_fr; | |
738 | unsigned int __unused; | |
739 | unsigned int pr_fsr; | |
740 | unsigned char pr_qcnt; | |
741 | unsigned char pr_q_entrysize; | |
742 | unsigned char pr_en; | |
743 | unsigned int pr_q[64]; | |
744 | } elf_fpregset_t32; | |
745 | ||
746 | /* | |
747 | * fill in the fpu structure for a core dump. | |
748 | */ | |
749 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
750 | { | |
751 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
752 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
753 | ||
754 | if (test_thread_flag(TIF_32BIT)) { | |
755 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
756 | ||
757 | if (fprs & FPRS_DL) | |
758 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
759 | sizeof(unsigned int) * 32); | |
760 | else | |
761 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
762 | sizeof(unsigned int) * 32); | |
763 | fpregs32->pr_qcnt = 0; | |
764 | fpregs32->pr_q_entrysize = 8; | |
765 | memset(&fpregs32->pr_q[0], 0, | |
766 | (sizeof(unsigned int) * 64)); | |
767 | if (fprs & FPRS_FEF) { | |
768 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
769 | fpregs32->pr_en = 1; | |
770 | } else { | |
771 | fpregs32->pr_fsr = 0; | |
772 | fpregs32->pr_en = 0; | |
773 | } | |
774 | } else { | |
775 | if(fprs & FPRS_DL) | |
776 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
777 | sizeof(unsigned int) * 32); | |
778 | else | |
779 | memset(&fpregs->pr_regs[0], 0, | |
780 | sizeof(unsigned int) * 32); | |
781 | if(fprs & FPRS_DU) | |
782 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
783 | sizeof(unsigned int) * 32); | |
784 | else | |
785 | memset(&fpregs->pr_regs[16], 0, | |
786 | sizeof(unsigned int) * 32); | |
787 | if(fprs & FPRS_FEF) { | |
788 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
789 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
790 | } else { | |
791 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
792 | } | |
793 | fpregs->pr_fprs = fprs; | |
794 | } | |
795 | return 1; | |
796 | } | |
797 | ||
798 | /* | |
799 | * sparc_execve() executes a new program after the asm stub has set | |
800 | * things up for us. This should basically do what I want it to. | |
801 | */ | |
802 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
803 | { | |
804 | int error, base = 0; | |
805 | char *filename; | |
806 | ||
807 | /* User register window flush is done by entry.S */ | |
808 | ||
809 | /* Check for indirect call. */ | |
810 | if (regs->u_regs[UREG_G1] == 0) | |
811 | base = 1; | |
812 | ||
813 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
814 | error = PTR_ERR(filename); | |
815 | if (IS_ERR(filename)) | |
816 | goto out; | |
817 | error = do_execve(filename, | |
818 | (char __user * __user *) | |
819 | regs->u_regs[base + UREG_I1], | |
820 | (char __user * __user *) | |
821 | regs->u_regs[base + UREG_I2], regs); | |
822 | putname(filename); | |
823 | if (!error) { | |
824 | fprs_write(0); | |
825 | current_thread_info()->xfsr[0] = 0; | |
826 | current_thread_info()->fpsaved[0] = 0; | |
827 | regs->tstate &= ~TSTATE_PEF; | |
828 | task_lock(current); | |
829 | current->ptrace &= ~PT_DTRACE; | |
830 | task_unlock(current); | |
831 | } | |
832 | out: | |
833 | return error; | |
834 | } | |
835 | ||
836 | unsigned long get_wchan(struct task_struct *task) | |
837 | { | |
838 | unsigned long pc, fp, bias = 0; | |
839 | unsigned long thread_info_base; | |
840 | struct reg_window *rw; | |
841 | unsigned long ret = 0; | |
842 | int count = 0; | |
843 | ||
844 | if (!task || task == current || | |
845 | task->state == TASK_RUNNING) | |
846 | goto out; | |
847 | ||
848 | thread_info_base = (unsigned long) task->thread_info; | |
849 | bias = STACK_BIAS; | |
850 | fp = task->thread_info->ksp + bias; | |
851 | ||
852 | do { | |
853 | /* Bogus frame pointer? */ | |
854 | if (fp < (thread_info_base + sizeof(struct thread_info)) || | |
855 | fp >= (thread_info_base + THREAD_SIZE)) | |
856 | break; | |
857 | rw = (struct reg_window *) fp; | |
858 | pc = rw->ins[7]; | |
859 | if (!in_sched_functions(pc)) { | |
860 | ret = pc; | |
861 | goto out; | |
862 | } | |
863 | fp = rw->ins[6] + bias; | |
864 | } while (++count < 16); | |
865 | ||
866 | out: | |
867 | return ret; | |
868 | } |