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Commit | Line | Data |
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5526b7e4 | 1 | /* arch/sparc64/kernel/process.c |
1da177e4 | 2 | * |
93dae5b7 | 3 | * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
5 | * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | */ | |
7 | ||
8 | /* | |
9 | * This file handles the architecture-dependent parts of process handling.. | |
10 | */ | |
11 | ||
12 | #include <stdarg.h> | |
13 | ||
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/kallsyms.h> | |
19 | #include <linux/mm.h> | |
4e950f6f | 20 | #include <linux/fs.h> |
1da177e4 | 21 | #include <linux/smp.h> |
1da177e4 LT |
22 | #include <linux/stddef.h> |
23 | #include <linux/ptrace.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/user.h> | |
1da177e4 LT |
26 | #include <linux/reboot.h> |
27 | #include <linux/delay.h> | |
28 | #include <linux/compat.h> | |
038cb01e | 29 | #include <linux/tick.h> |
1da177e4 | 30 | #include <linux/init.h> |
e0204409 | 31 | #include <linux/cpu.h> |
b1422401 | 32 | #include <linux/elfcore.h> |
93dae5b7 | 33 | #include <linux/sysrq.h> |
1da177e4 LT |
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> | |
74bf4312 | 47 | #include <asm/mmu_context.h> |
1da177e4 | 48 | #include <asm/unistd.h> |
30c91d57 | 49 | #include <asm/hypervisor.h> |
22d6a1cb | 50 | #include <asm/sstate.h> |
c3c25240 | 51 | #include <asm/reboot.h> |
b1422401 | 52 | #include <asm/syscalls.h> |
93dae5b7 DM |
53 | #include <asm/irq_regs.h> |
54 | #include <asm/smp.h> | |
1da177e4 LT |
55 | |
56 | /* #define VERBOSE_SHOWREGS */ | |
57 | ||
e0204409 | 58 | static void sparc64_yield(int cpu) |
1da177e4 | 59 | { |
30c91d57 DM |
60 | if (tlb_type != hypervisor) |
61 | return; | |
62 | ||
63 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
64 | smp_mb__after_clear_bit(); | |
65 | ||
e0204409 | 66 | while (!need_resched() && !cpu_is_offline(cpu)) { |
30c91d57 DM |
67 | unsigned long pstate; |
68 | ||
69 | /* Disable interrupts. */ | |
70 | __asm__ __volatile__( | |
71 | "rdpr %%pstate, %0\n\t" | |
72 | "andn %0, %1, %0\n\t" | |
73 | "wrpr %0, %%g0, %%pstate" | |
74 | : "=&r" (pstate) | |
75 | : "i" (PSTATE_IE)); | |
76 | ||
e0204409 | 77 | if (!need_resched() && !cpu_is_offline(cpu)) |
30c91d57 DM |
78 | sun4v_cpu_yield(); |
79 | ||
80 | /* Re-enable interrupts. */ | |
81 | __asm__ __volatile__( | |
82 | "rdpr %%pstate, %0\n\t" | |
83 | "or %0, %1, %0\n\t" | |
84 | "wrpr %0, %%g0, %%pstate" | |
85 | : "=&r" (pstate) | |
86 | : "i" (PSTATE_IE)); | |
1da177e4 | 87 | } |
1da177e4 | 88 | |
30c91d57 DM |
89 | set_thread_flag(TIF_POLLING_NRFLAG); |
90 | } | |
1da177e4 | 91 | |
30c91d57 | 92 | /* The idle loop on sparc64. */ |
1da177e4 LT |
93 | void cpu_idle(void) |
94 | { | |
e0204409 DM |
95 | int cpu = smp_processor_id(); |
96 | ||
1da177e4 | 97 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 | 98 | |
1da177e4 | 99 | while(1) { |
b8f8c3cf | 100 | tick_nohz_stop_sched_tick(1); |
e0204409 DM |
101 | |
102 | while (!need_resched() && !cpu_is_offline(cpu)) | |
103 | sparc64_yield(cpu); | |
104 | ||
038cb01e DM |
105 | tick_nohz_restart_sched_tick(); |
106 | ||
107 | preempt_enable_no_resched(); | |
e0204409 DM |
108 | |
109 | #ifdef CONFIG_HOTPLUG_CPU | |
110 | if (cpu_is_offline(cpu)) | |
111 | cpu_play_dead(); | |
112 | #endif | |
113 | ||
038cb01e DM |
114 | schedule(); |
115 | preempt_disable(); | |
1da177e4 LT |
116 | } |
117 | } | |
118 | ||
1da177e4 LT |
119 | void machine_halt(void) |
120 | { | |
22d6a1cb | 121 | sstate_halt(); |
1da177e4 LT |
122 | prom_halt(); |
123 | panic("Halt failed!"); | |
124 | } | |
125 | ||
1da177e4 LT |
126 | void machine_alt_power_off(void) |
127 | { | |
22d6a1cb | 128 | sstate_poweroff(); |
1da177e4 LT |
129 | prom_halt_power_off(); |
130 | panic("Power-off failed!"); | |
131 | } | |
132 | ||
133 | void machine_restart(char * cmd) | |
134 | { | |
135 | char *p; | |
136 | ||
22d6a1cb | 137 | sstate_reboot(); |
1da177e4 LT |
138 | p = strchr (reboot_command, '\n'); |
139 | if (p) *p = 0; | |
1da177e4 LT |
140 | if (cmd) |
141 | prom_reboot(cmd); | |
142 | if (*reboot_command) | |
143 | prom_reboot(reboot_command); | |
144 | prom_reboot(""); | |
145 | panic("Reboot failed!"); | |
146 | } | |
147 | ||
959a85ad | 148 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
149 | static void show_regwindow32(struct pt_regs *regs) |
150 | { | |
151 | struct reg_window32 __user *rw; | |
152 | struct reg_window32 r_w; | |
153 | mm_segment_t old_fs; | |
154 | ||
155 | __asm__ __volatile__ ("flushw"); | |
156 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
157 | old_fs = get_fs(); | |
158 | set_fs (USER_DS); | |
159 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
160 | set_fs (old_fs); | |
161 | return; | |
162 | } | |
163 | ||
164 | set_fs (old_fs); | |
165 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
166 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
167 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
168 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
169 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
170 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
171 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
172 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
173 | } | |
959a85ad DM |
174 | #else |
175 | #define show_regwindow32(regs) do { } while (0) | |
176 | #endif | |
1da177e4 LT |
177 | |
178 | static void show_regwindow(struct pt_regs *regs) | |
179 | { | |
180 | struct reg_window __user *rw; | |
181 | struct reg_window *rwk; | |
182 | struct reg_window r_w; | |
183 | mm_segment_t old_fs; | |
184 | ||
185 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
186 | __asm__ __volatile__ ("flushw"); | |
187 | rw = (struct reg_window __user *) | |
188 | (regs->u_regs[14] + STACK_BIAS); | |
189 | rwk = (struct reg_window *) | |
190 | (regs->u_regs[14] + STACK_BIAS); | |
191 | if (!(regs->tstate & TSTATE_PRIV)) { | |
192 | old_fs = get_fs(); | |
193 | set_fs (USER_DS); | |
194 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
195 | set_fs (old_fs); | |
196 | return; | |
197 | } | |
198 | rwk = &r_w; | |
199 | set_fs (old_fs); | |
200 | } | |
201 | } else { | |
202 | show_regwindow32(regs); | |
203 | return; | |
204 | } | |
205 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
206 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
207 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
208 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
209 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
210 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
211 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
212 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
213 | if (regs->tstate & TSTATE_PRIV) | |
214 | print_symbol("I7: <%s>\n", rwk->ins[7]); | |
215 | } | |
216 | ||
1da177e4 LT |
217 | #ifdef CONFIG_SMP |
218 | static DEFINE_SPINLOCK(regdump_lock); | |
219 | #endif | |
220 | ||
221 | void __show_regs(struct pt_regs * regs) | |
222 | { | |
223 | #ifdef CONFIG_SMP | |
224 | unsigned long flags; | |
225 | ||
226 | /* Protect against xcall ipis which might lead to livelock on the lock */ | |
227 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" | |
228 | "wrpr %0, %1, %%pstate" | |
229 | : "=r" (flags) | |
230 | : "i" (PSTATE_IE)); | |
231 | spin_lock(®dump_lock); | |
232 | #endif | |
233 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, | |
234 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
235 | print_symbol("TPC: <%s>\n", regs->tpc); | |
236 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", | |
237 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
238 | regs->u_regs[3]); | |
239 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
240 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
241 | regs->u_regs[7]); | |
242 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
243 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
244 | regs->u_regs[11]); | |
245 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
246 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
247 | regs->u_regs[15]); | |
248 | print_symbol("RPC: <%s>\n", regs->u_regs[15]); | |
249 | show_regwindow(regs); | |
250 | #ifdef CONFIG_SMP | |
251 | spin_unlock(®dump_lock); | |
252 | __asm__ __volatile__("wrpr %0, 0, %%pstate" | |
253 | : : "r" (flags)); | |
254 | #endif | |
255 | } | |
256 | ||
257 | #ifdef VERBOSE_SHOWREGS | |
258 | static void idump_from_user (unsigned int *pc) | |
259 | { | |
260 | int i; | |
261 | int code; | |
262 | ||
263 | if((((unsigned long) pc) & 3)) | |
264 | return; | |
265 | ||
266 | pc -= 3; | |
267 | for(i = -3; i < 6; i++) { | |
268 | get_user(code, pc); | |
269 | printk("%c%08x%c",i?' ':'<',code,i?' ':'>'); | |
270 | pc++; | |
271 | } | |
272 | printk("\n"); | |
273 | } | |
274 | #endif | |
275 | ||
276 | void show_regs(struct pt_regs *regs) | |
277 | { | |
278 | #ifdef VERBOSE_SHOWREGS | |
279 | extern long etrap, etraptl1; | |
280 | #endif | |
281 | __show_regs(regs); | |
19a0d585 | 282 | #if 0 |
1da177e4 LT |
283 | #ifdef CONFIG_SMP |
284 | { | |
285 | extern void smp_report_regs(void); | |
286 | ||
287 | smp_report_regs(); | |
288 | } | |
289 | #endif | |
19a0d585 | 290 | #endif |
1da177e4 LT |
291 | |
292 | #ifdef VERBOSE_SHOWREGS | |
293 | if (regs->tpc >= &etrap && regs->tpc < &etraptl1 && | |
294 | regs->u_regs[14] >= (long)current - PAGE_SIZE && | |
295 | regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) { | |
296 | printk ("*********parent**********\n"); | |
297 | __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF)); | |
298 | idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc); | |
299 | printk ("*********endpar**********\n"); | |
300 | } | |
301 | #endif | |
302 | } | |
303 | ||
93dae5b7 DM |
304 | #ifdef CONFIG_MAGIC_SYSRQ |
305 | struct global_reg_snapshot global_reg_snapshot[NR_CPUS]; | |
306 | static DEFINE_SPINLOCK(global_reg_snapshot_lock); | |
307 | ||
308 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, | |
309 | int this_cpu) | |
310 | { | |
311 | flushw_all(); | |
312 | ||
313 | global_reg_snapshot[this_cpu].tstate = regs->tstate; | |
314 | global_reg_snapshot[this_cpu].tpc = regs->tpc; | |
315 | global_reg_snapshot[this_cpu].tnpc = regs->tnpc; | |
316 | global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7]; | |
317 | ||
318 | if (regs->tstate & TSTATE_PRIV) { | |
319 | struct reg_window *rw; | |
320 | ||
321 | rw = (struct reg_window *) | |
322 | (regs->u_regs[UREG_FP] + STACK_BIAS); | |
323 | global_reg_snapshot[this_cpu].i7 = rw->ins[6]; | |
324 | } else | |
325 | global_reg_snapshot[this_cpu].i7 = 0; | |
326 | ||
327 | global_reg_snapshot[this_cpu].thread = tp; | |
328 | } | |
329 | ||
330 | /* In order to avoid hangs we do not try to synchronize with the | |
331 | * global register dump client cpus. The last store they make is to | |
332 | * the thread pointer, so do a short poll waiting for that to become | |
333 | * non-NULL. | |
334 | */ | |
335 | static void __global_reg_poll(struct global_reg_snapshot *gp) | |
336 | { | |
337 | int limit = 0; | |
338 | ||
339 | while (!gp->thread && ++limit < 100) { | |
340 | barrier(); | |
341 | udelay(1); | |
342 | } | |
343 | } | |
344 | ||
345 | static void sysrq_handle_globreg(int key, struct tty_struct *tty) | |
346 | { | |
347 | struct thread_info *tp = current_thread_info(); | |
348 | struct pt_regs *regs = get_irq_regs(); | |
349 | #ifdef CONFIG_KALLSYMS | |
350 | char buffer[KSYM_SYMBOL_LEN]; | |
351 | #endif | |
352 | unsigned long flags; | |
353 | int this_cpu, cpu; | |
354 | ||
355 | if (!regs) | |
356 | regs = tp->kregs; | |
357 | ||
358 | spin_lock_irqsave(&global_reg_snapshot_lock, flags); | |
359 | ||
360 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); | |
361 | ||
362 | this_cpu = raw_smp_processor_id(); | |
363 | ||
364 | __global_reg_self(tp, regs, this_cpu); | |
365 | ||
366 | smp_fetch_global_regs(); | |
367 | ||
368 | for_each_online_cpu(cpu) { | |
369 | struct global_reg_snapshot *gp = &global_reg_snapshot[cpu]; | |
370 | struct thread_info *tp; | |
371 | ||
372 | __global_reg_poll(gp); | |
373 | ||
374 | tp = gp->thread; | |
375 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", | |
376 | (cpu == this_cpu ? '*' : ' '), cpu, | |
377 | gp->tstate, gp->tpc, gp->tnpc, | |
378 | ((tp && tp->task) ? tp->task->comm : "NULL"), | |
379 | ((tp && tp->task) ? tp->task->pid : -1)); | |
380 | #ifdef CONFIG_KALLSYMS | |
381 | if (gp->tstate & TSTATE_PRIV) { | |
382 | sprint_symbol(buffer, gp->tpc); | |
383 | printk(" TPC[%s] ", buffer); | |
384 | sprint_symbol(buffer, gp->o7); | |
385 | printk("O7[%s] ", buffer); | |
386 | sprint_symbol(buffer, gp->i7); | |
387 | printk("I7[%s]\n", buffer); | |
388 | } else | |
389 | #endif | |
390 | { | |
391 | printk(" TPC[%lx] O7[%lx] I7[%lx]\n", | |
392 | gp->tpc, gp->o7, gp->i7); | |
393 | } | |
394 | } | |
395 | ||
396 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); | |
397 | ||
398 | spin_unlock_irqrestore(&global_reg_snapshot_lock, flags); | |
399 | } | |
400 | ||
401 | static struct sysrq_key_op sparc_globalreg_op = { | |
402 | .handler = sysrq_handle_globreg, | |
403 | .help_msg = "Globalregs", | |
404 | .action_msg = "Show Global CPU Regs", | |
405 | }; | |
406 | ||
407 | static int __init sparc_globreg_init(void) | |
408 | { | |
409 | return register_sysrq_key('y', &sparc_globalreg_op); | |
410 | } | |
411 | ||
412 | core_initcall(sparc_globreg_init); | |
413 | ||
414 | #endif | |
415 | ||
1da177e4 LT |
416 | unsigned long thread_saved_pc(struct task_struct *tsk) |
417 | { | |
f3169641 | 418 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
419 | unsigned long ret = 0xdeadbeefUL; |
420 | ||
421 | if (ti && ti->ksp) { | |
422 | unsigned long *sp; | |
423 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
424 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
425 | sp[14]) { | |
426 | unsigned long *fp; | |
427 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
428 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
429 | ret = fp[15]; | |
430 | } | |
431 | } | |
432 | return ret; | |
433 | } | |
434 | ||
435 | /* Free current thread data structures etc.. */ | |
436 | void exit_thread(void) | |
437 | { | |
438 | struct thread_info *t = current_thread_info(); | |
439 | ||
440 | if (t->utraps) { | |
441 | if (t->utraps[0] < 2) | |
442 | kfree (t->utraps); | |
443 | else | |
444 | t->utraps[0]--; | |
445 | } | |
446 | ||
447 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
448 | t->user_cntd0 = t->user_cntd1 = NULL; | |
449 | t->pcr_reg = 0; | |
450 | write_pcr(0); | |
451 | } | |
452 | } | |
453 | ||
454 | void flush_thread(void) | |
455 | { | |
456 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 457 | struct mm_struct *mm; |
1da177e4 | 458 | |
c0a79b22 MD |
459 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
460 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
461 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
462 | clear_ti_thread_flag(t, TIF_32BIT); | |
463 | else | |
464 | set_ti_thread_flag(t, TIF_32BIT); | |
465 | } | |
1da177e4 | 466 | |
74bf4312 DM |
467 | mm = t->task->mm; |
468 | if (mm) | |
98c5584c | 469 | tsb_context_switch(mm); |
1da177e4 | 470 | |
1da177e4 LT |
471 | set_thread_wsaved(0); |
472 | ||
473 | /* Turn off performance counters if on. */ | |
474 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
475 | t->user_cntd0 = t->user_cntd1 = NULL; | |
476 | t->pcr_reg = 0; | |
477 | write_pcr(0); | |
478 | } | |
479 | ||
480 | /* Clear FPU register state. */ | |
481 | t->fpsaved[0] = 0; | |
482 | ||
483 | if (get_thread_current_ds() != ASI_AIUS) | |
484 | set_fs(USER_DS); | |
1da177e4 LT |
485 | } |
486 | ||
487 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
488 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
489 | { | |
490 | unsigned long fp, distance, rval; | |
491 | ||
492 | if (!(test_thread_flag(TIF_32BIT))) { | |
493 | csp += STACK_BIAS; | |
494 | psp += STACK_BIAS; | |
495 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
496 | fp += STACK_BIAS; | |
497 | } else | |
498 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
499 | ||
500 | /* Now 8-byte align the stack as this is mandatory in the | |
501 | * Sparc ABI due to how register windows work. This hides | |
502 | * the restriction from thread libraries etc. -DaveM | |
503 | */ | |
504 | csp &= ~7UL; | |
505 | ||
506 | distance = fp - psp; | |
507 | rval = (csp - distance); | |
508 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
509 | rval = 0; | |
510 | else if (test_thread_flag(TIF_32BIT)) { | |
511 | if (put_user(((u32)csp), | |
512 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
513 | rval = 0; | |
514 | } else { | |
515 | if (put_user(((u64)csp - STACK_BIAS), | |
516 | &(((struct reg_window __user *)rval)->ins[6]))) | |
517 | rval = 0; | |
518 | else | |
519 | rval = rval - STACK_BIAS; | |
520 | } | |
521 | ||
522 | return rval; | |
523 | } | |
524 | ||
525 | /* Standard stuff. */ | |
526 | static inline void shift_window_buffer(int first_win, int last_win, | |
527 | struct thread_info *t) | |
528 | { | |
529 | int i; | |
530 | ||
531 | for (i = first_win; i < last_win; i++) { | |
532 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
533 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
534 | sizeof(struct reg_window)); | |
535 | } | |
536 | } | |
537 | ||
538 | void synchronize_user_stack(void) | |
539 | { | |
540 | struct thread_info *t = current_thread_info(); | |
541 | unsigned long window; | |
542 | ||
543 | flush_user_windows(); | |
544 | if ((window = get_thread_wsaved()) != 0) { | |
545 | int winsize = sizeof(struct reg_window); | |
546 | int bias = 0; | |
547 | ||
548 | if (test_thread_flag(TIF_32BIT)) | |
549 | winsize = sizeof(struct reg_window32); | |
550 | else | |
551 | bias = STACK_BIAS; | |
552 | ||
553 | window -= 1; | |
554 | do { | |
555 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
556 | struct reg_window *rwin = &t->reg_window[window]; | |
557 | ||
558 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
559 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
560 | set_thread_wsaved(get_thread_wsaved() - 1); | |
561 | } | |
562 | } while (window--); | |
563 | } | |
564 | } | |
565 | ||
314ef685 DM |
566 | static void stack_unaligned(unsigned long sp) |
567 | { | |
568 | siginfo_t info; | |
569 | ||
570 | info.si_signo = SIGBUS; | |
571 | info.si_errno = 0; | |
572 | info.si_code = BUS_ADRALN; | |
573 | info.si_addr = (void __user *) sp; | |
574 | info.si_trapno = 0; | |
575 | force_sig_info(SIGBUS, &info, current); | |
576 | } | |
577 | ||
1da177e4 LT |
578 | void fault_in_user_windows(void) |
579 | { | |
580 | struct thread_info *t = current_thread_info(); | |
581 | unsigned long window; | |
582 | int winsize = sizeof(struct reg_window); | |
583 | int bias = 0; | |
584 | ||
585 | if (test_thread_flag(TIF_32BIT)) | |
586 | winsize = sizeof(struct reg_window32); | |
587 | else | |
588 | bias = STACK_BIAS; | |
589 | ||
590 | flush_user_windows(); | |
591 | window = get_thread_wsaved(); | |
592 | ||
314ef685 | 593 | if (likely(window != 0)) { |
1da177e4 LT |
594 | window -= 1; |
595 | do { | |
596 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
597 | struct reg_window *rwin = &t->reg_window[window]; | |
598 | ||
314ef685 DM |
599 | if (unlikely(sp & 0x7UL)) |
600 | stack_unaligned(sp); | |
601 | ||
602 | if (unlikely(copy_to_user((char __user *)sp, | |
603 | rwin, winsize))) | |
1da177e4 LT |
604 | goto barf; |
605 | } while (window--); | |
606 | } | |
607 | set_thread_wsaved(0); | |
608 | return; | |
609 | ||
610 | barf: | |
611 | set_thread_wsaved(window + 1); | |
612 | do_exit(SIGILL); | |
613 | } | |
614 | ||
615 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
616 | unsigned long stack_start, | |
617 | struct pt_regs *regs, | |
618 | unsigned long stack_size) | |
619 | { | |
620 | int __user *parent_tid_ptr, *child_tid_ptr; | |
1e38c126 DM |
621 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
622 | long ret; | |
1da177e4 LT |
623 | |
624 | #ifdef CONFIG_COMPAT | |
625 | if (test_thread_flag(TIF_32BIT)) { | |
626 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
627 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
628 | } else | |
629 | #endif | |
630 | { | |
631 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
632 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
633 | } | |
634 | ||
1e38c126 DM |
635 | ret = do_fork(clone_flags, stack_start, |
636 | regs, stack_size, | |
637 | parent_tid_ptr, child_tid_ptr); | |
638 | ||
639 | /* If we get an error and potentially restart the system | |
640 | * call, we're screwed because copy_thread() clobbered | |
641 | * the parent's %o1. So detect that case and restore it | |
642 | * here. | |
643 | */ | |
644 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
645 | regs->u_regs[UREG_I1] = orig_i1; | |
646 | ||
647 | return ret; | |
1da177e4 LT |
648 | } |
649 | ||
650 | /* Copy a Sparc thread. The fork() return value conventions | |
651 | * under SunOS are nothing short of bletcherous: | |
652 | * Parent --> %o0 == childs pid, %o1 == 0 | |
653 | * Child --> %o0 == parents pid, %o1 == 1 | |
654 | */ | |
655 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
656 | unsigned long unused, | |
657 | struct task_struct *p, struct pt_regs *regs) | |
658 | { | |
ee3eea16 | 659 | struct thread_info *t = task_thread_info(p); |
a051bc5b DM |
660 | struct sparc_stackf *parent_sf; |
661 | unsigned long child_stack_sz; | |
1da177e4 | 662 | char *child_trap_frame; |
a051bc5b | 663 | int kernel_thread; |
1da177e4 | 664 | |
a051bc5b DM |
665 | kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0; |
666 | parent_sf = ((struct sparc_stackf *) regs) - 1; | |
1da177e4 | 667 | |
a051bc5b DM |
668 | /* Calculate offset to stack_frame & pt_regs */ |
669 | child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) + | |
670 | (kernel_thread ? STACKFRAME_SZ : 0)); | |
671 | child_trap_frame = (task_stack_page(p) + | |
672 | (THREAD_SIZE - child_stack_sz)); | |
673 | memcpy(child_trap_frame, parent_sf, child_stack_sz); | |
674 | ||
675 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | | |
676 | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 677 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 678 | t->new_child = 1; |
1da177e4 | 679 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
a051bc5b DM |
680 | t->kregs = (struct pt_regs *) (child_trap_frame + |
681 | sizeof(struct sparc_stackf)); | |
1da177e4 LT |
682 | t->fpsaved[0] = 0; |
683 | ||
a051bc5b DM |
684 | if (kernel_thread) { |
685 | struct sparc_stackf *child_sf = (struct sparc_stackf *) | |
686 | (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ)); | |
687 | ||
688 | /* Zero terminate the stack backtrace. */ | |
689 | child_sf->fp = NULL; | |
690 | t->kregs->u_regs[UREG_FP] = | |
691 | ((unsigned long) child_sf) - STACK_BIAS; | |
692 | ||
1da177e4 LT |
693 | /* Special case, if we are spawning a kernel thread from |
694 | * a userspace task (via KMOD, NFS, or similar) we must | |
695 | * disable performance counters in the child because the | |
696 | * address space and protection realm are changing. | |
697 | */ | |
698 | if (t->flags & _TIF_PERFCTR) { | |
699 | t->user_cntd0 = t->user_cntd1 = NULL; | |
700 | t->pcr_reg = 0; | |
701 | t->flags &= ~_TIF_PERFCTR; | |
702 | } | |
1da177e4 | 703 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); |
1da177e4 LT |
704 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; |
705 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
706 | } else { | |
707 | if (t->flags & _TIF_32BIT) { | |
708 | sp &= 0x00000000ffffffffUL; | |
709 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
710 | } | |
711 | t->kregs->u_regs[UREG_FP] = sp; | |
712 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
713 | if (sp != regs->u_regs[UREG_FP]) { | |
714 | unsigned long csp; | |
715 | ||
716 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
717 | if (!csp) | |
718 | return -EFAULT; | |
719 | t->kregs->u_regs[UREG_FP] = csp; | |
720 | } | |
721 | if (t->utraps) | |
722 | t->utraps[0]++; | |
723 | } | |
724 | ||
725 | /* Set the return value for the child. */ | |
726 | t->kregs->u_regs[UREG_I0] = current->pid; | |
727 | t->kregs->u_regs[UREG_I1] = 1; | |
728 | ||
729 | /* Set the second return value for the parent. */ | |
730 | regs->u_regs[UREG_I1] = 0; | |
731 | ||
732 | if (clone_flags & CLONE_SETTLS) | |
733 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | /* | |
739 | * This is the mechanism for creating a new kernel thread. | |
740 | * | |
741 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
742 | * who haven't done an "execve()") should use this: it will work within | |
743 | * a system call from a "real" process, but the process memory space will | |
e5dd42e4 | 744 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
745 | */ |
746 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
747 | { | |
748 | long retval; | |
749 | ||
750 | /* If the parent runs before fn(arg) is called by the child, | |
751 | * the input registers of this function can be clobbered. | |
752 | * So we stash 'fn' and 'arg' into global registers which | |
753 | * will not be modified by the parent. | |
754 | */ | |
755 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
756 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
757 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
758 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
759 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
760 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
761 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
762 | " mov %%o0, %0\n\t" | |
763 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
764 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
765 | "mov %3, %%g1\n\t" | |
766 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
767 | /* Notreached by child. */ | |
768 | "1:" : | |
769 | "=r" (retval) : | |
770 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
771 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
772 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
773 | return retval; | |
774 | } | |
775 | ||
1da177e4 LT |
776 | typedef struct { |
777 | union { | |
778 | unsigned int pr_regs[32]; | |
779 | unsigned long pr_dregs[16]; | |
780 | } pr_fr; | |
781 | unsigned int __unused; | |
782 | unsigned int pr_fsr; | |
783 | unsigned char pr_qcnt; | |
784 | unsigned char pr_q_entrysize; | |
785 | unsigned char pr_en; | |
786 | unsigned int pr_q[64]; | |
787 | } elf_fpregset_t32; | |
788 | ||
789 | /* | |
790 | * fill in the fpu structure for a core dump. | |
791 | */ | |
792 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
793 | { | |
794 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
795 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
796 | ||
797 | if (test_thread_flag(TIF_32BIT)) { | |
798 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
799 | ||
800 | if (fprs & FPRS_DL) | |
801 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
802 | sizeof(unsigned int) * 32); | |
803 | else | |
804 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
805 | sizeof(unsigned int) * 32); | |
806 | fpregs32->pr_qcnt = 0; | |
807 | fpregs32->pr_q_entrysize = 8; | |
808 | memset(&fpregs32->pr_q[0], 0, | |
809 | (sizeof(unsigned int) * 64)); | |
810 | if (fprs & FPRS_FEF) { | |
811 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
812 | fpregs32->pr_en = 1; | |
813 | } else { | |
814 | fpregs32->pr_fsr = 0; | |
815 | fpregs32->pr_en = 0; | |
816 | } | |
817 | } else { | |
818 | if(fprs & FPRS_DL) | |
819 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
820 | sizeof(unsigned int) * 32); | |
821 | else | |
822 | memset(&fpregs->pr_regs[0], 0, | |
823 | sizeof(unsigned int) * 32); | |
824 | if(fprs & FPRS_DU) | |
825 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
826 | sizeof(unsigned int) * 32); | |
827 | else | |
828 | memset(&fpregs->pr_regs[16], 0, | |
829 | sizeof(unsigned int) * 32); | |
830 | if(fprs & FPRS_FEF) { | |
831 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
832 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
833 | } else { | |
834 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
835 | } | |
836 | fpregs->pr_fprs = fprs; | |
837 | } | |
838 | return 1; | |
839 | } | |
840 | ||
841 | /* | |
842 | * sparc_execve() executes a new program after the asm stub has set | |
843 | * things up for us. This should basically do what I want it to. | |
844 | */ | |
845 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
846 | { | |
847 | int error, base = 0; | |
848 | char *filename; | |
849 | ||
850 | /* User register window flush is done by entry.S */ | |
851 | ||
852 | /* Check for indirect call. */ | |
853 | if (regs->u_regs[UREG_G1] == 0) | |
854 | base = 1; | |
855 | ||
856 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
857 | error = PTR_ERR(filename); | |
858 | if (IS_ERR(filename)) | |
859 | goto out; | |
860 | error = do_execve(filename, | |
861 | (char __user * __user *) | |
862 | regs->u_regs[base + UREG_I1], | |
863 | (char __user * __user *) | |
864 | regs->u_regs[base + UREG_I2], regs); | |
865 | putname(filename); | |
866 | if (!error) { | |
867 | fprs_write(0); | |
868 | current_thread_info()->xfsr[0] = 0; | |
869 | current_thread_info()->fpsaved[0] = 0; | |
870 | regs->tstate &= ~TSTATE_PEF; | |
1da177e4 LT |
871 | } |
872 | out: | |
873 | return error; | |
874 | } | |
875 | ||
876 | unsigned long get_wchan(struct task_struct *task) | |
877 | { | |
878 | unsigned long pc, fp, bias = 0; | |
879 | unsigned long thread_info_base; | |
880 | struct reg_window *rw; | |
881 | unsigned long ret = 0; | |
882 | int count = 0; | |
883 | ||
884 | if (!task || task == current || | |
885 | task->state == TASK_RUNNING) | |
886 | goto out; | |
887 | ||
ee3eea16 | 888 | thread_info_base = (unsigned long) task_stack_page(task); |
1da177e4 | 889 | bias = STACK_BIAS; |
f3169641 | 890 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
891 | |
892 | do { | |
893 | /* Bogus frame pointer? */ | |
894 | if (fp < (thread_info_base + sizeof(struct thread_info)) || | |
895 | fp >= (thread_info_base + THREAD_SIZE)) | |
896 | break; | |
897 | rw = (struct reg_window *) fp; | |
898 | pc = rw->ins[7]; | |
899 | if (!in_sched_functions(pc)) { | |
900 | ret = pc; | |
901 | goto out; | |
902 | } | |
903 | fp = rw->ins[6] + bias; | |
904 | } while (++count < 16); | |
905 | ||
906 | out: | |
907 | return ret; | |
908 | } |