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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 | ||
1da177e4 LT |
15 | #include <linux/errno.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/kallsyms.h> | |
20 | #include <linux/mm.h> | |
4e950f6f | 21 | #include <linux/fs.h> |
1da177e4 | 22 | #include <linux/smp.h> |
1da177e4 LT |
23 | #include <linux/stddef.h> |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/user.h> | |
1da177e4 LT |
27 | #include <linux/reboot.h> |
28 | #include <linux/delay.h> | |
29 | #include <linux/compat.h> | |
038cb01e | 30 | #include <linux/tick.h> |
1da177e4 | 31 | #include <linux/init.h> |
e0204409 | 32 | #include <linux/cpu.h> |
1da177e4 LT |
33 | |
34 | #include <asm/oplib.h> | |
35 | #include <asm/uaccess.h> | |
36 | #include <asm/system.h> | |
37 | #include <asm/page.h> | |
38 | #include <asm/pgalloc.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/processor.h> | |
41 | #include <asm/pstate.h> | |
42 | #include <asm/elf.h> | |
43 | #include <asm/fpumacro.h> | |
44 | #include <asm/head.h> | |
45 | #include <asm/cpudata.h> | |
74bf4312 | 46 | #include <asm/mmu_context.h> |
1da177e4 | 47 | #include <asm/unistd.h> |
30c91d57 | 48 | #include <asm/hypervisor.h> |
22d6a1cb | 49 | #include <asm/sstate.h> |
c3c25240 | 50 | #include <asm/reboot.h> |
1da177e4 LT |
51 | |
52 | /* #define VERBOSE_SHOWREGS */ | |
53 | ||
e0204409 | 54 | static void sparc64_yield(int cpu) |
1da177e4 | 55 | { |
30c91d57 DM |
56 | if (tlb_type != hypervisor) |
57 | return; | |
58 | ||
59 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
60 | smp_mb__after_clear_bit(); | |
61 | ||
e0204409 | 62 | while (!need_resched() && !cpu_is_offline(cpu)) { |
30c91d57 DM |
63 | unsigned long pstate; |
64 | ||
65 | /* Disable interrupts. */ | |
66 | __asm__ __volatile__( | |
67 | "rdpr %%pstate, %0\n\t" | |
68 | "andn %0, %1, %0\n\t" | |
69 | "wrpr %0, %%g0, %%pstate" | |
70 | : "=&r" (pstate) | |
71 | : "i" (PSTATE_IE)); | |
72 | ||
e0204409 | 73 | if (!need_resched() && !cpu_is_offline(cpu)) |
30c91d57 DM |
74 | sun4v_cpu_yield(); |
75 | ||
76 | /* Re-enable interrupts. */ | |
77 | __asm__ __volatile__( | |
78 | "rdpr %%pstate, %0\n\t" | |
79 | "or %0, %1, %0\n\t" | |
80 | "wrpr %0, %%g0, %%pstate" | |
81 | : "=&r" (pstate) | |
82 | : "i" (PSTATE_IE)); | |
1da177e4 | 83 | } |
1da177e4 | 84 | |
30c91d57 DM |
85 | set_thread_flag(TIF_POLLING_NRFLAG); |
86 | } | |
1da177e4 | 87 | |
30c91d57 | 88 | /* The idle loop on sparc64. */ |
1da177e4 LT |
89 | void cpu_idle(void) |
90 | { | |
e0204409 DM |
91 | int cpu = smp_processor_id(); |
92 | ||
1da177e4 | 93 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 | 94 | |
1da177e4 | 95 | while(1) { |
038cb01e | 96 | tick_nohz_stop_sched_tick(); |
e0204409 DM |
97 | |
98 | while (!need_resched() && !cpu_is_offline(cpu)) | |
99 | sparc64_yield(cpu); | |
100 | ||
038cb01e DM |
101 | tick_nohz_restart_sched_tick(); |
102 | ||
103 | preempt_enable_no_resched(); | |
e0204409 DM |
104 | |
105 | #ifdef CONFIG_HOTPLUG_CPU | |
106 | if (cpu_is_offline(cpu)) | |
107 | cpu_play_dead(); | |
108 | #endif | |
109 | ||
038cb01e DM |
110 | schedule(); |
111 | preempt_disable(); | |
1da177e4 LT |
112 | } |
113 | } | |
114 | ||
1da177e4 LT |
115 | extern char reboot_command []; |
116 | ||
1da177e4 LT |
117 | void machine_halt(void) |
118 | { | |
22d6a1cb | 119 | sstate_halt(); |
1da177e4 LT |
120 | prom_halt(); |
121 | panic("Halt failed!"); | |
122 | } | |
123 | ||
1da177e4 LT |
124 | void machine_alt_power_off(void) |
125 | { | |
22d6a1cb | 126 | sstate_poweroff(); |
1da177e4 LT |
127 | prom_halt_power_off(); |
128 | panic("Power-off failed!"); | |
129 | } | |
130 | ||
131 | void machine_restart(char * cmd) | |
132 | { | |
133 | char *p; | |
134 | ||
22d6a1cb | 135 | sstate_reboot(); |
1da177e4 LT |
136 | p = strchr (reboot_command, '\n'); |
137 | if (p) *p = 0; | |
1da177e4 LT |
138 | if (cmd) |
139 | prom_reboot(cmd); | |
140 | if (*reboot_command) | |
141 | prom_reboot(reboot_command); | |
142 | prom_reboot(""); | |
143 | panic("Reboot failed!"); | |
144 | } | |
145 | ||
959a85ad | 146 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
147 | static void show_regwindow32(struct pt_regs *regs) |
148 | { | |
149 | struct reg_window32 __user *rw; | |
150 | struct reg_window32 r_w; | |
151 | mm_segment_t old_fs; | |
152 | ||
153 | __asm__ __volatile__ ("flushw"); | |
154 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
155 | old_fs = get_fs(); | |
156 | set_fs (USER_DS); | |
157 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
158 | set_fs (old_fs); | |
159 | return; | |
160 | } | |
161 | ||
162 | set_fs (old_fs); | |
163 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
164 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
165 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
166 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
167 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
168 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
169 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
170 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
171 | } | |
959a85ad DM |
172 | #else |
173 | #define show_regwindow32(regs) do { } while (0) | |
174 | #endif | |
1da177e4 LT |
175 | |
176 | static void show_regwindow(struct pt_regs *regs) | |
177 | { | |
178 | struct reg_window __user *rw; | |
179 | struct reg_window *rwk; | |
180 | struct reg_window r_w; | |
181 | mm_segment_t old_fs; | |
182 | ||
183 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
184 | __asm__ __volatile__ ("flushw"); | |
185 | rw = (struct reg_window __user *) | |
186 | (regs->u_regs[14] + STACK_BIAS); | |
187 | rwk = (struct reg_window *) | |
188 | (regs->u_regs[14] + STACK_BIAS); | |
189 | if (!(regs->tstate & TSTATE_PRIV)) { | |
190 | old_fs = get_fs(); | |
191 | set_fs (USER_DS); | |
192 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
193 | set_fs (old_fs); | |
194 | return; | |
195 | } | |
196 | rwk = &r_w; | |
197 | set_fs (old_fs); | |
198 | } | |
199 | } else { | |
200 | show_regwindow32(regs); | |
201 | return; | |
202 | } | |
203 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
204 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
205 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
206 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
207 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
208 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
209 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
210 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
211 | if (regs->tstate & TSTATE_PRIV) | |
212 | print_symbol("I7: <%s>\n", rwk->ins[7]); | |
213 | } | |
214 | ||
1da177e4 LT |
215 | #ifdef CONFIG_SMP |
216 | static DEFINE_SPINLOCK(regdump_lock); | |
217 | #endif | |
218 | ||
219 | void __show_regs(struct pt_regs * regs) | |
220 | { | |
221 | #ifdef CONFIG_SMP | |
222 | unsigned long flags; | |
223 | ||
224 | /* Protect against xcall ipis which might lead to livelock on the lock */ | |
225 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" | |
226 | "wrpr %0, %1, %%pstate" | |
227 | : "=r" (flags) | |
228 | : "i" (PSTATE_IE)); | |
229 | spin_lock(®dump_lock); | |
230 | #endif | |
231 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, | |
232 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
233 | print_symbol("TPC: <%s>\n", regs->tpc); | |
234 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", | |
235 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
236 | regs->u_regs[3]); | |
237 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
238 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
239 | regs->u_regs[7]); | |
240 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
241 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
242 | regs->u_regs[11]); | |
243 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
244 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
245 | regs->u_regs[15]); | |
246 | print_symbol("RPC: <%s>\n", regs->u_regs[15]); | |
247 | show_regwindow(regs); | |
248 | #ifdef CONFIG_SMP | |
249 | spin_unlock(®dump_lock); | |
250 | __asm__ __volatile__("wrpr %0, 0, %%pstate" | |
251 | : : "r" (flags)); | |
252 | #endif | |
253 | } | |
254 | ||
255 | #ifdef VERBOSE_SHOWREGS | |
256 | static void idump_from_user (unsigned int *pc) | |
257 | { | |
258 | int i; | |
259 | int code; | |
260 | ||
261 | if((((unsigned long) pc) & 3)) | |
262 | return; | |
263 | ||
264 | pc -= 3; | |
265 | for(i = -3; i < 6; i++) { | |
266 | get_user(code, pc); | |
267 | printk("%c%08x%c",i?' ':'<',code,i?' ':'>'); | |
268 | pc++; | |
269 | } | |
270 | printk("\n"); | |
271 | } | |
272 | #endif | |
273 | ||
274 | void show_regs(struct pt_regs *regs) | |
275 | { | |
276 | #ifdef VERBOSE_SHOWREGS | |
277 | extern long etrap, etraptl1; | |
278 | #endif | |
279 | __show_regs(regs); | |
19a0d585 | 280 | #if 0 |
1da177e4 LT |
281 | #ifdef CONFIG_SMP |
282 | { | |
283 | extern void smp_report_regs(void); | |
284 | ||
285 | smp_report_regs(); | |
286 | } | |
287 | #endif | |
19a0d585 | 288 | #endif |
1da177e4 LT |
289 | |
290 | #ifdef VERBOSE_SHOWREGS | |
291 | if (regs->tpc >= &etrap && regs->tpc < &etraptl1 && | |
292 | regs->u_regs[14] >= (long)current - PAGE_SIZE && | |
293 | regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) { | |
294 | printk ("*********parent**********\n"); | |
295 | __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF)); | |
296 | idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc); | |
297 | printk ("*********endpar**********\n"); | |
298 | } | |
299 | #endif | |
300 | } | |
301 | ||
1da177e4 LT |
302 | unsigned long thread_saved_pc(struct task_struct *tsk) |
303 | { | |
f3169641 | 304 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
305 | unsigned long ret = 0xdeadbeefUL; |
306 | ||
307 | if (ti && ti->ksp) { | |
308 | unsigned long *sp; | |
309 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
310 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
311 | sp[14]) { | |
312 | unsigned long *fp; | |
313 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
314 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
315 | ret = fp[15]; | |
316 | } | |
317 | } | |
318 | return ret; | |
319 | } | |
320 | ||
321 | /* Free current thread data structures etc.. */ | |
322 | void exit_thread(void) | |
323 | { | |
324 | struct thread_info *t = current_thread_info(); | |
325 | ||
326 | if (t->utraps) { | |
327 | if (t->utraps[0] < 2) | |
328 | kfree (t->utraps); | |
329 | else | |
330 | t->utraps[0]--; | |
331 | } | |
332 | ||
333 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
334 | t->user_cntd0 = t->user_cntd1 = NULL; | |
335 | t->pcr_reg = 0; | |
336 | write_pcr(0); | |
337 | } | |
338 | } | |
339 | ||
340 | void flush_thread(void) | |
341 | { | |
342 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 343 | struct mm_struct *mm; |
1da177e4 | 344 | |
c0a79b22 MD |
345 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
346 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
347 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
348 | clear_ti_thread_flag(t, TIF_32BIT); | |
349 | else | |
350 | set_ti_thread_flag(t, TIF_32BIT); | |
351 | } | |
1da177e4 | 352 | |
74bf4312 DM |
353 | mm = t->task->mm; |
354 | if (mm) | |
98c5584c | 355 | tsb_context_switch(mm); |
1da177e4 | 356 | |
1da177e4 LT |
357 | set_thread_wsaved(0); |
358 | ||
359 | /* Turn off performance counters if on. */ | |
360 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
361 | t->user_cntd0 = t->user_cntd1 = NULL; | |
362 | t->pcr_reg = 0; | |
363 | write_pcr(0); | |
364 | } | |
365 | ||
366 | /* Clear FPU register state. */ | |
367 | t->fpsaved[0] = 0; | |
368 | ||
369 | if (get_thread_current_ds() != ASI_AIUS) | |
370 | set_fs(USER_DS); | |
371 | ||
372 | /* Init new signal delivery disposition. */ | |
373 | clear_thread_flag(TIF_NEWSIGNALS); | |
374 | } | |
375 | ||
376 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
377 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
378 | { | |
379 | unsigned long fp, distance, rval; | |
380 | ||
381 | if (!(test_thread_flag(TIF_32BIT))) { | |
382 | csp += STACK_BIAS; | |
383 | psp += STACK_BIAS; | |
384 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
385 | fp += STACK_BIAS; | |
386 | } else | |
387 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
388 | ||
389 | /* Now 8-byte align the stack as this is mandatory in the | |
390 | * Sparc ABI due to how register windows work. This hides | |
391 | * the restriction from thread libraries etc. -DaveM | |
392 | */ | |
393 | csp &= ~7UL; | |
394 | ||
395 | distance = fp - psp; | |
396 | rval = (csp - distance); | |
397 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
398 | rval = 0; | |
399 | else if (test_thread_flag(TIF_32BIT)) { | |
400 | if (put_user(((u32)csp), | |
401 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
402 | rval = 0; | |
403 | } else { | |
404 | if (put_user(((u64)csp - STACK_BIAS), | |
405 | &(((struct reg_window __user *)rval)->ins[6]))) | |
406 | rval = 0; | |
407 | else | |
408 | rval = rval - STACK_BIAS; | |
409 | } | |
410 | ||
411 | return rval; | |
412 | } | |
413 | ||
414 | /* Standard stuff. */ | |
415 | static inline void shift_window_buffer(int first_win, int last_win, | |
416 | struct thread_info *t) | |
417 | { | |
418 | int i; | |
419 | ||
420 | for (i = first_win; i < last_win; i++) { | |
421 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
422 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
423 | sizeof(struct reg_window)); | |
424 | } | |
425 | } | |
426 | ||
427 | void synchronize_user_stack(void) | |
428 | { | |
429 | struct thread_info *t = current_thread_info(); | |
430 | unsigned long window; | |
431 | ||
432 | flush_user_windows(); | |
433 | if ((window = get_thread_wsaved()) != 0) { | |
434 | int winsize = sizeof(struct reg_window); | |
435 | int bias = 0; | |
436 | ||
437 | if (test_thread_flag(TIF_32BIT)) | |
438 | winsize = sizeof(struct reg_window32); | |
439 | else | |
440 | bias = STACK_BIAS; | |
441 | ||
442 | window -= 1; | |
443 | do { | |
444 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
445 | struct reg_window *rwin = &t->reg_window[window]; | |
446 | ||
447 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
448 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
449 | set_thread_wsaved(get_thread_wsaved() - 1); | |
450 | } | |
451 | } while (window--); | |
452 | } | |
453 | } | |
454 | ||
314ef685 DM |
455 | static void stack_unaligned(unsigned long sp) |
456 | { | |
457 | siginfo_t info; | |
458 | ||
459 | info.si_signo = SIGBUS; | |
460 | info.si_errno = 0; | |
461 | info.si_code = BUS_ADRALN; | |
462 | info.si_addr = (void __user *) sp; | |
463 | info.si_trapno = 0; | |
464 | force_sig_info(SIGBUS, &info, current); | |
465 | } | |
466 | ||
1da177e4 LT |
467 | void fault_in_user_windows(void) |
468 | { | |
469 | struct thread_info *t = current_thread_info(); | |
470 | unsigned long window; | |
471 | int winsize = sizeof(struct reg_window); | |
472 | int bias = 0; | |
473 | ||
474 | if (test_thread_flag(TIF_32BIT)) | |
475 | winsize = sizeof(struct reg_window32); | |
476 | else | |
477 | bias = STACK_BIAS; | |
478 | ||
479 | flush_user_windows(); | |
480 | window = get_thread_wsaved(); | |
481 | ||
314ef685 | 482 | if (likely(window != 0)) { |
1da177e4 LT |
483 | window -= 1; |
484 | do { | |
485 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
486 | struct reg_window *rwin = &t->reg_window[window]; | |
487 | ||
314ef685 DM |
488 | if (unlikely(sp & 0x7UL)) |
489 | stack_unaligned(sp); | |
490 | ||
491 | if (unlikely(copy_to_user((char __user *)sp, | |
492 | rwin, winsize))) | |
1da177e4 LT |
493 | goto barf; |
494 | } while (window--); | |
495 | } | |
496 | set_thread_wsaved(0); | |
497 | return; | |
498 | ||
499 | barf: | |
500 | set_thread_wsaved(window + 1); | |
501 | do_exit(SIGILL); | |
502 | } | |
503 | ||
504 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
505 | unsigned long stack_start, | |
506 | struct pt_regs *regs, | |
507 | unsigned long stack_size) | |
508 | { | |
509 | int __user *parent_tid_ptr, *child_tid_ptr; | |
510 | ||
511 | #ifdef CONFIG_COMPAT | |
512 | if (test_thread_flag(TIF_32BIT)) { | |
513 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
514 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
515 | } else | |
516 | #endif | |
517 | { | |
518 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
519 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
520 | } | |
521 | ||
522 | return do_fork(clone_flags, stack_start, | |
523 | regs, stack_size, | |
524 | parent_tid_ptr, child_tid_ptr); | |
525 | } | |
526 | ||
527 | /* Copy a Sparc thread. The fork() return value conventions | |
528 | * under SunOS are nothing short of bletcherous: | |
529 | * Parent --> %o0 == childs pid, %o1 == 0 | |
530 | * Child --> %o0 == parents pid, %o1 == 1 | |
531 | */ | |
532 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
533 | unsigned long unused, | |
534 | struct task_struct *p, struct pt_regs *regs) | |
535 | { | |
ee3eea16 | 536 | struct thread_info *t = task_thread_info(p); |
1da177e4 LT |
537 | char *child_trap_frame; |
538 | ||
1da177e4 | 539 | /* Calculate offset to stack_frame & pt_regs */ |
ee3eea16 | 540 | child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ)); |
1da177e4 LT |
541 | memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ)); |
542 | ||
543 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 544 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 545 | t->new_child = 1; |
1da177e4 LT |
546 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
547 | t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf)); | |
548 | t->fpsaved[0] = 0; | |
549 | ||
550 | if (regs->tstate & TSTATE_PRIV) { | |
551 | /* Special case, if we are spawning a kernel thread from | |
552 | * a userspace task (via KMOD, NFS, or similar) we must | |
553 | * disable performance counters in the child because the | |
554 | * address space and protection realm are changing. | |
555 | */ | |
556 | if (t->flags & _TIF_PERFCTR) { | |
557 | t->user_cntd0 = t->user_cntd1 = NULL; | |
558 | t->pcr_reg = 0; | |
559 | t->flags &= ~_TIF_PERFCTR; | |
560 | } | |
561 | t->kregs->u_regs[UREG_FP] = t->ksp; | |
562 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); | |
563 | flush_register_windows(); | |
564 | memcpy((void *)(t->ksp + STACK_BIAS), | |
565 | (void *)(regs->u_regs[UREG_FP] + STACK_BIAS), | |
566 | sizeof(struct sparc_stackf)); | |
567 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; | |
568 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
569 | } else { | |
570 | if (t->flags & _TIF_32BIT) { | |
571 | sp &= 0x00000000ffffffffUL; | |
572 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
573 | } | |
574 | t->kregs->u_regs[UREG_FP] = sp; | |
575 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
576 | if (sp != regs->u_regs[UREG_FP]) { | |
577 | unsigned long csp; | |
578 | ||
579 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
580 | if (!csp) | |
581 | return -EFAULT; | |
582 | t->kregs->u_regs[UREG_FP] = csp; | |
583 | } | |
584 | if (t->utraps) | |
585 | t->utraps[0]++; | |
586 | } | |
587 | ||
588 | /* Set the return value for the child. */ | |
589 | t->kregs->u_regs[UREG_I0] = current->pid; | |
590 | t->kregs->u_regs[UREG_I1] = 1; | |
591 | ||
592 | /* Set the second return value for the parent. */ | |
593 | regs->u_regs[UREG_I1] = 0; | |
594 | ||
595 | if (clone_flags & CLONE_SETTLS) | |
596 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
601 | /* | |
602 | * This is the mechanism for creating a new kernel thread. | |
603 | * | |
604 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
605 | * who haven't done an "execve()") should use this: it will work within | |
606 | * a system call from a "real" process, but the process memory space will | |
e5dd42e4 | 607 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
608 | */ |
609 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
610 | { | |
611 | long retval; | |
612 | ||
613 | /* If the parent runs before fn(arg) is called by the child, | |
614 | * the input registers of this function can be clobbered. | |
615 | * So we stash 'fn' and 'arg' into global registers which | |
616 | * will not be modified by the parent. | |
617 | */ | |
618 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
619 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
620 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
621 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
622 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
623 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
624 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
625 | " mov %%o0, %0\n\t" | |
626 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
627 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
628 | "mov %3, %%g1\n\t" | |
629 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
630 | /* Notreached by child. */ | |
631 | "1:" : | |
632 | "=r" (retval) : | |
633 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
634 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
635 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
636 | return retval; | |
637 | } | |
638 | ||
1da177e4 LT |
639 | typedef struct { |
640 | union { | |
641 | unsigned int pr_regs[32]; | |
642 | unsigned long pr_dregs[16]; | |
643 | } pr_fr; | |
644 | unsigned int __unused; | |
645 | unsigned int pr_fsr; | |
646 | unsigned char pr_qcnt; | |
647 | unsigned char pr_q_entrysize; | |
648 | unsigned char pr_en; | |
649 | unsigned int pr_q[64]; | |
650 | } elf_fpregset_t32; | |
651 | ||
652 | /* | |
653 | * fill in the fpu structure for a core dump. | |
654 | */ | |
655 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
656 | { | |
657 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
658 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
659 | ||
660 | if (test_thread_flag(TIF_32BIT)) { | |
661 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
662 | ||
663 | if (fprs & FPRS_DL) | |
664 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
665 | sizeof(unsigned int) * 32); | |
666 | else | |
667 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
668 | sizeof(unsigned int) * 32); | |
669 | fpregs32->pr_qcnt = 0; | |
670 | fpregs32->pr_q_entrysize = 8; | |
671 | memset(&fpregs32->pr_q[0], 0, | |
672 | (sizeof(unsigned int) * 64)); | |
673 | if (fprs & FPRS_FEF) { | |
674 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
675 | fpregs32->pr_en = 1; | |
676 | } else { | |
677 | fpregs32->pr_fsr = 0; | |
678 | fpregs32->pr_en = 0; | |
679 | } | |
680 | } else { | |
681 | if(fprs & FPRS_DL) | |
682 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
683 | sizeof(unsigned int) * 32); | |
684 | else | |
685 | memset(&fpregs->pr_regs[0], 0, | |
686 | sizeof(unsigned int) * 32); | |
687 | if(fprs & FPRS_DU) | |
688 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
689 | sizeof(unsigned int) * 32); | |
690 | else | |
691 | memset(&fpregs->pr_regs[16], 0, | |
692 | sizeof(unsigned int) * 32); | |
693 | if(fprs & FPRS_FEF) { | |
694 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
695 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
696 | } else { | |
697 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
698 | } | |
699 | fpregs->pr_fprs = fprs; | |
700 | } | |
701 | return 1; | |
702 | } | |
703 | ||
704 | /* | |
705 | * sparc_execve() executes a new program after the asm stub has set | |
706 | * things up for us. This should basically do what I want it to. | |
707 | */ | |
708 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
709 | { | |
710 | int error, base = 0; | |
711 | char *filename; | |
712 | ||
713 | /* User register window flush is done by entry.S */ | |
714 | ||
715 | /* Check for indirect call. */ | |
716 | if (regs->u_regs[UREG_G1] == 0) | |
717 | base = 1; | |
718 | ||
719 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
720 | error = PTR_ERR(filename); | |
721 | if (IS_ERR(filename)) | |
722 | goto out; | |
723 | error = do_execve(filename, | |
724 | (char __user * __user *) | |
725 | regs->u_regs[base + UREG_I1], | |
726 | (char __user * __user *) | |
727 | regs->u_regs[base + UREG_I2], regs); | |
728 | putname(filename); | |
729 | if (!error) { | |
730 | fprs_write(0); | |
731 | current_thread_info()->xfsr[0] = 0; | |
732 | current_thread_info()->fpsaved[0] = 0; | |
733 | regs->tstate &= ~TSTATE_PEF; | |
734 | task_lock(current); | |
735 | current->ptrace &= ~PT_DTRACE; | |
736 | task_unlock(current); | |
737 | } | |
738 | out: | |
739 | return error; | |
740 | } | |
741 | ||
742 | unsigned long get_wchan(struct task_struct *task) | |
743 | { | |
744 | unsigned long pc, fp, bias = 0; | |
745 | unsigned long thread_info_base; | |
746 | struct reg_window *rw; | |
747 | unsigned long ret = 0; | |
748 | int count = 0; | |
749 | ||
750 | if (!task || task == current || | |
751 | task->state == TASK_RUNNING) | |
752 | goto out; | |
753 | ||
ee3eea16 | 754 | thread_info_base = (unsigned long) task_stack_page(task); |
1da177e4 | 755 | bias = STACK_BIAS; |
f3169641 | 756 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
757 | |
758 | do { | |
759 | /* Bogus frame pointer? */ | |
760 | if (fp < (thread_info_base + sizeof(struct thread_info)) || | |
761 | fp >= (thread_info_base + THREAD_SIZE)) | |
762 | break; | |
763 | rw = (struct reg_window *) fp; | |
764 | pc = rw->ins[7]; | |
765 | if (!in_sched_functions(pc)) { | |
766 | ret = pc; | |
767 | goto out; | |
768 | } | |
769 | fp = rw->ins[6] + bias; | |
770 | } while (++count < 16); | |
771 | ||
772 | out: | |
773 | return ret; | |
774 | } |