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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> | |
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> | |
26 | #include <linux/a.out.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> |
1da177e4 LT |
50 | |
51 | /* #define VERBOSE_SHOWREGS */ | |
52 | ||
e0204409 | 53 | static void sparc64_yield(int cpu) |
1da177e4 | 54 | { |
30c91d57 DM |
55 | if (tlb_type != hypervisor) |
56 | return; | |
57 | ||
58 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
59 | smp_mb__after_clear_bit(); | |
60 | ||
e0204409 | 61 | while (!need_resched() && !cpu_is_offline(cpu)) { |
30c91d57 DM |
62 | unsigned long pstate; |
63 | ||
64 | /* Disable interrupts. */ | |
65 | __asm__ __volatile__( | |
66 | "rdpr %%pstate, %0\n\t" | |
67 | "andn %0, %1, %0\n\t" | |
68 | "wrpr %0, %%g0, %%pstate" | |
69 | : "=&r" (pstate) | |
70 | : "i" (PSTATE_IE)); | |
71 | ||
e0204409 | 72 | if (!need_resched() && !cpu_is_offline(cpu)) |
30c91d57 DM |
73 | sun4v_cpu_yield(); |
74 | ||
75 | /* Re-enable interrupts. */ | |
76 | __asm__ __volatile__( | |
77 | "rdpr %%pstate, %0\n\t" | |
78 | "or %0, %1, %0\n\t" | |
79 | "wrpr %0, %%g0, %%pstate" | |
80 | : "=&r" (pstate) | |
81 | : "i" (PSTATE_IE)); | |
1da177e4 | 82 | } |
1da177e4 | 83 | |
30c91d57 DM |
84 | set_thread_flag(TIF_POLLING_NRFLAG); |
85 | } | |
1da177e4 | 86 | |
30c91d57 | 87 | /* The idle loop on sparc64. */ |
1da177e4 LT |
88 | void cpu_idle(void) |
89 | { | |
e0204409 DM |
90 | int cpu = smp_processor_id(); |
91 | ||
1da177e4 | 92 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 | 93 | |
1da177e4 | 94 | while(1) { |
038cb01e | 95 | tick_nohz_stop_sched_tick(); |
e0204409 DM |
96 | |
97 | while (!need_resched() && !cpu_is_offline(cpu)) | |
98 | sparc64_yield(cpu); | |
99 | ||
038cb01e DM |
100 | tick_nohz_restart_sched_tick(); |
101 | ||
102 | preempt_enable_no_resched(); | |
e0204409 DM |
103 | |
104 | #ifdef CONFIG_HOTPLUG_CPU | |
105 | if (cpu_is_offline(cpu)) | |
106 | cpu_play_dead(); | |
107 | #endif | |
108 | ||
038cb01e DM |
109 | schedule(); |
110 | preempt_disable(); | |
1da177e4 LT |
111 | } |
112 | } | |
113 | ||
1da177e4 LT |
114 | extern char reboot_command []; |
115 | ||
116 | extern void (*prom_palette)(int); | |
117 | extern void (*prom_keyboard)(void); | |
118 | ||
119 | void machine_halt(void) | |
120 | { | |
22d6a1cb | 121 | sstate_halt(); |
1da177e4 LT |
122 | if (!serial_console && prom_palette) |
123 | prom_palette (1); | |
124 | if (prom_keyboard) | |
125 | prom_keyboard(); | |
126 | prom_halt(); | |
127 | panic("Halt failed!"); | |
128 | } | |
129 | ||
1da177e4 LT |
130 | void machine_alt_power_off(void) |
131 | { | |
22d6a1cb | 132 | sstate_poweroff(); |
1da177e4 LT |
133 | if (!serial_console && prom_palette) |
134 | prom_palette(1); | |
135 | if (prom_keyboard) | |
136 | prom_keyboard(); | |
137 | prom_halt_power_off(); | |
138 | panic("Power-off failed!"); | |
139 | } | |
140 | ||
141 | void machine_restart(char * cmd) | |
142 | { | |
143 | char *p; | |
144 | ||
22d6a1cb | 145 | sstate_reboot(); |
1da177e4 LT |
146 | p = strchr (reboot_command, '\n'); |
147 | if (p) *p = 0; | |
148 | if (!serial_console && prom_palette) | |
149 | prom_palette (1); | |
150 | if (prom_keyboard) | |
151 | prom_keyboard(); | |
152 | if (cmd) | |
153 | prom_reboot(cmd); | |
154 | if (*reboot_command) | |
155 | prom_reboot(reboot_command); | |
156 | prom_reboot(""); | |
157 | panic("Reboot failed!"); | |
158 | } | |
159 | ||
959a85ad | 160 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
161 | static void show_regwindow32(struct pt_regs *regs) |
162 | { | |
163 | struct reg_window32 __user *rw; | |
164 | struct reg_window32 r_w; | |
165 | mm_segment_t old_fs; | |
166 | ||
167 | __asm__ __volatile__ ("flushw"); | |
168 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
169 | old_fs = get_fs(); | |
170 | set_fs (USER_DS); | |
171 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
172 | set_fs (old_fs); | |
173 | return; | |
174 | } | |
175 | ||
176 | set_fs (old_fs); | |
177 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
178 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
179 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
180 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
181 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
182 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
183 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
184 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
185 | } | |
959a85ad DM |
186 | #else |
187 | #define show_regwindow32(regs) do { } while (0) | |
188 | #endif | |
1da177e4 LT |
189 | |
190 | static void show_regwindow(struct pt_regs *regs) | |
191 | { | |
192 | struct reg_window __user *rw; | |
193 | struct reg_window *rwk; | |
194 | struct reg_window r_w; | |
195 | mm_segment_t old_fs; | |
196 | ||
197 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
198 | __asm__ __volatile__ ("flushw"); | |
199 | rw = (struct reg_window __user *) | |
200 | (regs->u_regs[14] + STACK_BIAS); | |
201 | rwk = (struct reg_window *) | |
202 | (regs->u_regs[14] + STACK_BIAS); | |
203 | if (!(regs->tstate & TSTATE_PRIV)) { | |
204 | old_fs = get_fs(); | |
205 | set_fs (USER_DS); | |
206 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
207 | set_fs (old_fs); | |
208 | return; | |
209 | } | |
210 | rwk = &r_w; | |
211 | set_fs (old_fs); | |
212 | } | |
213 | } else { | |
214 | show_regwindow32(regs); | |
215 | return; | |
216 | } | |
217 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
218 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
219 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
220 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
221 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
222 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
223 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
224 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
225 | if (regs->tstate & TSTATE_PRIV) | |
226 | print_symbol("I7: <%s>\n", rwk->ins[7]); | |
227 | } | |
228 | ||
229 | void show_stackframe(struct sparc_stackf *sf) | |
230 | { | |
231 | unsigned long size; | |
232 | unsigned long *stk; | |
233 | int i; | |
234 | ||
235 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n" | |
236 | "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
237 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3], | |
238 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
239 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n" | |
240 | "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n", | |
241 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3], | |
242 | sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc); | |
243 | printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n" | |
244 | "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n", | |
245 | (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1], | |
246 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
247 | sf->xxargs[0]); | |
248 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
249 | size -= STACKFRAME_SZ; | |
250 | stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ); | |
251 | i = 0; | |
252 | do { | |
253 | printk("s%d: %016lx\n", i++, *stk++); | |
254 | } while ((size -= sizeof(unsigned long))); | |
255 | } | |
256 | ||
257 | void show_stackframe32(struct sparc_stackf32 *sf) | |
258 | { | |
259 | unsigned long size; | |
260 | unsigned *stk; | |
261 | int i; | |
262 | ||
263 | printk("l0: %08x l1: %08x l2: %08x l3: %08x\n", | |
264 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]); | |
265 | printk("l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
266 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
267 | printk("i0: %08x i1: %08x i2: %08x i3: %08x\n", | |
268 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]); | |
269 | printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n", | |
270 | sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc); | |
271 | printk("sp: %08x x0: %08x x1: %08x x2: %08x\n" | |
272 | "x3: %08x x4: %08x x5: %08x xx: %08x\n", | |
273 | sf->structptr, sf->xargs[0], sf->xargs[1], | |
274 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
275 | sf->xxargs[0]); | |
276 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
277 | size -= STACKFRAME32_SZ; | |
278 | stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ); | |
279 | i = 0; | |
280 | do { | |
281 | printk("s%d: %08x\n", i++, *stk++); | |
282 | } while ((size -= sizeof(unsigned))); | |
283 | } | |
284 | ||
285 | #ifdef CONFIG_SMP | |
286 | static DEFINE_SPINLOCK(regdump_lock); | |
287 | #endif | |
288 | ||
289 | void __show_regs(struct pt_regs * regs) | |
290 | { | |
291 | #ifdef CONFIG_SMP | |
292 | unsigned long flags; | |
293 | ||
294 | /* Protect against xcall ipis which might lead to livelock on the lock */ | |
295 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" | |
296 | "wrpr %0, %1, %%pstate" | |
297 | : "=r" (flags) | |
298 | : "i" (PSTATE_IE)); | |
299 | spin_lock(®dump_lock); | |
300 | #endif | |
301 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, | |
302 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
303 | print_symbol("TPC: <%s>\n", regs->tpc); | |
304 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", | |
305 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
306 | regs->u_regs[3]); | |
307 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
308 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
309 | regs->u_regs[7]); | |
310 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
311 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
312 | regs->u_regs[11]); | |
313 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
314 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
315 | regs->u_regs[15]); | |
316 | print_symbol("RPC: <%s>\n", regs->u_regs[15]); | |
317 | show_regwindow(regs); | |
318 | #ifdef CONFIG_SMP | |
319 | spin_unlock(®dump_lock); | |
320 | __asm__ __volatile__("wrpr %0, 0, %%pstate" | |
321 | : : "r" (flags)); | |
322 | #endif | |
323 | } | |
324 | ||
325 | #ifdef VERBOSE_SHOWREGS | |
326 | static void idump_from_user (unsigned int *pc) | |
327 | { | |
328 | int i; | |
329 | int code; | |
330 | ||
331 | if((((unsigned long) pc) & 3)) | |
332 | return; | |
333 | ||
334 | pc -= 3; | |
335 | for(i = -3; i < 6; i++) { | |
336 | get_user(code, pc); | |
337 | printk("%c%08x%c",i?' ':'<',code,i?' ':'>'); | |
338 | pc++; | |
339 | } | |
340 | printk("\n"); | |
341 | } | |
342 | #endif | |
343 | ||
344 | void show_regs(struct pt_regs *regs) | |
345 | { | |
346 | #ifdef VERBOSE_SHOWREGS | |
347 | extern long etrap, etraptl1; | |
348 | #endif | |
349 | __show_regs(regs); | |
19a0d585 | 350 | #if 0 |
1da177e4 LT |
351 | #ifdef CONFIG_SMP |
352 | { | |
353 | extern void smp_report_regs(void); | |
354 | ||
355 | smp_report_regs(); | |
356 | } | |
357 | #endif | |
19a0d585 | 358 | #endif |
1da177e4 LT |
359 | |
360 | #ifdef VERBOSE_SHOWREGS | |
361 | if (regs->tpc >= &etrap && regs->tpc < &etraptl1 && | |
362 | regs->u_regs[14] >= (long)current - PAGE_SIZE && | |
363 | regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) { | |
364 | printk ("*********parent**********\n"); | |
365 | __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF)); | |
366 | idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc); | |
367 | printk ("*********endpar**********\n"); | |
368 | } | |
369 | #endif | |
370 | } | |
371 | ||
372 | void show_regs32(struct pt_regs32 *regs) | |
373 | { | |
374 | printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr, | |
375 | regs->pc, regs->npc, regs->y, print_tainted()); | |
376 | printk("g0: %08x g1: %08x g2: %08x g3: %08x ", | |
377 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
378 | regs->u_regs[3]); | |
379 | printk("g4: %08x g5: %08x g6: %08x g7: %08x\n", | |
380 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
381 | regs->u_regs[7]); | |
382 | printk("o0: %08x o1: %08x o2: %08x o3: %08x ", | |
383 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
384 | regs->u_regs[11]); | |
385 | printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n", | |
386 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
387 | regs->u_regs[15]); | |
388 | } | |
389 | ||
390 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
391 | { | |
f3169641 | 392 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
393 | unsigned long ret = 0xdeadbeefUL; |
394 | ||
395 | if (ti && ti->ksp) { | |
396 | unsigned long *sp; | |
397 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
398 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
399 | sp[14]) { | |
400 | unsigned long *fp; | |
401 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
402 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
403 | ret = fp[15]; | |
404 | } | |
405 | } | |
406 | return ret; | |
407 | } | |
408 | ||
409 | /* Free current thread data structures etc.. */ | |
410 | void exit_thread(void) | |
411 | { | |
412 | struct thread_info *t = current_thread_info(); | |
413 | ||
414 | if (t->utraps) { | |
415 | if (t->utraps[0] < 2) | |
416 | kfree (t->utraps); | |
417 | else | |
418 | t->utraps[0]--; | |
419 | } | |
420 | ||
421 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
422 | t->user_cntd0 = t->user_cntd1 = NULL; | |
423 | t->pcr_reg = 0; | |
424 | write_pcr(0); | |
425 | } | |
426 | } | |
427 | ||
428 | void flush_thread(void) | |
429 | { | |
430 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 431 | struct mm_struct *mm; |
1da177e4 | 432 | |
c0a79b22 MD |
433 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
434 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
435 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
436 | clear_ti_thread_flag(t, TIF_32BIT); | |
437 | else | |
438 | set_ti_thread_flag(t, TIF_32BIT); | |
439 | } | |
1da177e4 | 440 | |
74bf4312 DM |
441 | mm = t->task->mm; |
442 | if (mm) | |
98c5584c | 443 | tsb_context_switch(mm); |
1da177e4 | 444 | |
1da177e4 LT |
445 | set_thread_wsaved(0); |
446 | ||
447 | /* Turn off performance counters if on. */ | |
448 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
449 | t->user_cntd0 = t->user_cntd1 = NULL; | |
450 | t->pcr_reg = 0; | |
451 | write_pcr(0); | |
452 | } | |
453 | ||
454 | /* Clear FPU register state. */ | |
455 | t->fpsaved[0] = 0; | |
456 | ||
457 | if (get_thread_current_ds() != ASI_AIUS) | |
458 | set_fs(USER_DS); | |
459 | ||
460 | /* Init new signal delivery disposition. */ | |
461 | clear_thread_flag(TIF_NEWSIGNALS); | |
462 | } | |
463 | ||
464 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
465 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
466 | { | |
467 | unsigned long fp, distance, rval; | |
468 | ||
469 | if (!(test_thread_flag(TIF_32BIT))) { | |
470 | csp += STACK_BIAS; | |
471 | psp += STACK_BIAS; | |
472 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
473 | fp += STACK_BIAS; | |
474 | } else | |
475 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
476 | ||
477 | /* Now 8-byte align the stack as this is mandatory in the | |
478 | * Sparc ABI due to how register windows work. This hides | |
479 | * the restriction from thread libraries etc. -DaveM | |
480 | */ | |
481 | csp &= ~7UL; | |
482 | ||
483 | distance = fp - psp; | |
484 | rval = (csp - distance); | |
485 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
486 | rval = 0; | |
487 | else if (test_thread_flag(TIF_32BIT)) { | |
488 | if (put_user(((u32)csp), | |
489 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
490 | rval = 0; | |
491 | } else { | |
492 | if (put_user(((u64)csp - STACK_BIAS), | |
493 | &(((struct reg_window __user *)rval)->ins[6]))) | |
494 | rval = 0; | |
495 | else | |
496 | rval = rval - STACK_BIAS; | |
497 | } | |
498 | ||
499 | return rval; | |
500 | } | |
501 | ||
502 | /* Standard stuff. */ | |
503 | static inline void shift_window_buffer(int first_win, int last_win, | |
504 | struct thread_info *t) | |
505 | { | |
506 | int i; | |
507 | ||
508 | for (i = first_win; i < last_win; i++) { | |
509 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
510 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
511 | sizeof(struct reg_window)); | |
512 | } | |
513 | } | |
514 | ||
515 | void synchronize_user_stack(void) | |
516 | { | |
517 | struct thread_info *t = current_thread_info(); | |
518 | unsigned long window; | |
519 | ||
520 | flush_user_windows(); | |
521 | if ((window = get_thread_wsaved()) != 0) { | |
522 | int winsize = sizeof(struct reg_window); | |
523 | int bias = 0; | |
524 | ||
525 | if (test_thread_flag(TIF_32BIT)) | |
526 | winsize = sizeof(struct reg_window32); | |
527 | else | |
528 | bias = STACK_BIAS; | |
529 | ||
530 | window -= 1; | |
531 | do { | |
532 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
533 | struct reg_window *rwin = &t->reg_window[window]; | |
534 | ||
535 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
536 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
537 | set_thread_wsaved(get_thread_wsaved() - 1); | |
538 | } | |
539 | } while (window--); | |
540 | } | |
541 | } | |
542 | ||
314ef685 DM |
543 | static void stack_unaligned(unsigned long sp) |
544 | { | |
545 | siginfo_t info; | |
546 | ||
547 | info.si_signo = SIGBUS; | |
548 | info.si_errno = 0; | |
549 | info.si_code = BUS_ADRALN; | |
550 | info.si_addr = (void __user *) sp; | |
551 | info.si_trapno = 0; | |
552 | force_sig_info(SIGBUS, &info, current); | |
553 | } | |
554 | ||
1da177e4 LT |
555 | void fault_in_user_windows(void) |
556 | { | |
557 | struct thread_info *t = current_thread_info(); | |
558 | unsigned long window; | |
559 | int winsize = sizeof(struct reg_window); | |
560 | int bias = 0; | |
561 | ||
562 | if (test_thread_flag(TIF_32BIT)) | |
563 | winsize = sizeof(struct reg_window32); | |
564 | else | |
565 | bias = STACK_BIAS; | |
566 | ||
567 | flush_user_windows(); | |
568 | window = get_thread_wsaved(); | |
569 | ||
314ef685 | 570 | if (likely(window != 0)) { |
1da177e4 LT |
571 | window -= 1; |
572 | do { | |
573 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
574 | struct reg_window *rwin = &t->reg_window[window]; | |
575 | ||
314ef685 DM |
576 | if (unlikely(sp & 0x7UL)) |
577 | stack_unaligned(sp); | |
578 | ||
579 | if (unlikely(copy_to_user((char __user *)sp, | |
580 | rwin, winsize))) | |
1da177e4 LT |
581 | goto barf; |
582 | } while (window--); | |
583 | } | |
584 | set_thread_wsaved(0); | |
585 | return; | |
586 | ||
587 | barf: | |
588 | set_thread_wsaved(window + 1); | |
589 | do_exit(SIGILL); | |
590 | } | |
591 | ||
592 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
593 | unsigned long stack_start, | |
594 | struct pt_regs *regs, | |
595 | unsigned long stack_size) | |
596 | { | |
597 | int __user *parent_tid_ptr, *child_tid_ptr; | |
598 | ||
599 | #ifdef CONFIG_COMPAT | |
600 | if (test_thread_flag(TIF_32BIT)) { | |
601 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
602 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
603 | } else | |
604 | #endif | |
605 | { | |
606 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
607 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
608 | } | |
609 | ||
610 | return do_fork(clone_flags, stack_start, | |
611 | regs, stack_size, | |
612 | parent_tid_ptr, child_tid_ptr); | |
613 | } | |
614 | ||
615 | /* Copy a Sparc thread. The fork() return value conventions | |
616 | * under SunOS are nothing short of bletcherous: | |
617 | * Parent --> %o0 == childs pid, %o1 == 0 | |
618 | * Child --> %o0 == parents pid, %o1 == 1 | |
619 | */ | |
620 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
621 | unsigned long unused, | |
622 | struct task_struct *p, struct pt_regs *regs) | |
623 | { | |
ee3eea16 | 624 | struct thread_info *t = task_thread_info(p); |
1da177e4 LT |
625 | char *child_trap_frame; |
626 | ||
1da177e4 | 627 | /* Calculate offset to stack_frame & pt_regs */ |
ee3eea16 | 628 | child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ)); |
1da177e4 LT |
629 | memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ)); |
630 | ||
631 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 632 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 633 | t->new_child = 1; |
1da177e4 LT |
634 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
635 | t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf)); | |
636 | t->fpsaved[0] = 0; | |
637 | ||
638 | if (regs->tstate & TSTATE_PRIV) { | |
639 | /* Special case, if we are spawning a kernel thread from | |
640 | * a userspace task (via KMOD, NFS, or similar) we must | |
641 | * disable performance counters in the child because the | |
642 | * address space and protection realm are changing. | |
643 | */ | |
644 | if (t->flags & _TIF_PERFCTR) { | |
645 | t->user_cntd0 = t->user_cntd1 = NULL; | |
646 | t->pcr_reg = 0; | |
647 | t->flags &= ~_TIF_PERFCTR; | |
648 | } | |
649 | t->kregs->u_regs[UREG_FP] = t->ksp; | |
650 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); | |
651 | flush_register_windows(); | |
652 | memcpy((void *)(t->ksp + STACK_BIAS), | |
653 | (void *)(regs->u_regs[UREG_FP] + STACK_BIAS), | |
654 | sizeof(struct sparc_stackf)); | |
655 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; | |
656 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
657 | } else { | |
658 | if (t->flags & _TIF_32BIT) { | |
659 | sp &= 0x00000000ffffffffUL; | |
660 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
661 | } | |
662 | t->kregs->u_regs[UREG_FP] = sp; | |
663 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
664 | if (sp != regs->u_regs[UREG_FP]) { | |
665 | unsigned long csp; | |
666 | ||
667 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
668 | if (!csp) | |
669 | return -EFAULT; | |
670 | t->kregs->u_regs[UREG_FP] = csp; | |
671 | } | |
672 | if (t->utraps) | |
673 | t->utraps[0]++; | |
674 | } | |
675 | ||
676 | /* Set the return value for the child. */ | |
677 | t->kregs->u_regs[UREG_I0] = current->pid; | |
678 | t->kregs->u_regs[UREG_I1] = 1; | |
679 | ||
680 | /* Set the second return value for the parent. */ | |
681 | regs->u_regs[UREG_I1] = 0; | |
682 | ||
683 | if (clone_flags & CLONE_SETTLS) | |
684 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | /* | |
690 | * This is the mechanism for creating a new kernel thread. | |
691 | * | |
692 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
693 | * who haven't done an "execve()") should use this: it will work within | |
694 | * a system call from a "real" process, but the process memory space will | |
e5dd42e4 | 695 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
696 | */ |
697 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
698 | { | |
699 | long retval; | |
700 | ||
701 | /* If the parent runs before fn(arg) is called by the child, | |
702 | * the input registers of this function can be clobbered. | |
703 | * So we stash 'fn' and 'arg' into global registers which | |
704 | * will not be modified by the parent. | |
705 | */ | |
706 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
707 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
708 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
709 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
710 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
711 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
712 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
713 | " mov %%o0, %0\n\t" | |
714 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
715 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
716 | "mov %3, %%g1\n\t" | |
717 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
718 | /* Notreached by child. */ | |
719 | "1:" : | |
720 | "=r" (retval) : | |
721 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
722 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
723 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
724 | return retval; | |
725 | } | |
726 | ||
727 | /* | |
728 | * fill in the user structure for a core dump.. | |
729 | */ | |
730 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
731 | { | |
732 | /* Only should be used for SunOS and ancient a.out | |
733 | * SparcLinux binaries... Not worth implementing. | |
734 | */ | |
735 | memset(dump, 0, sizeof(struct user)); | |
736 | } | |
737 | ||
738 | typedef struct { | |
739 | union { | |
740 | unsigned int pr_regs[32]; | |
741 | unsigned long pr_dregs[16]; | |
742 | } pr_fr; | |
743 | unsigned int __unused; | |
744 | unsigned int pr_fsr; | |
745 | unsigned char pr_qcnt; | |
746 | unsigned char pr_q_entrysize; | |
747 | unsigned char pr_en; | |
748 | unsigned int pr_q[64]; | |
749 | } elf_fpregset_t32; | |
750 | ||
751 | /* | |
752 | * fill in the fpu structure for a core dump. | |
753 | */ | |
754 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
755 | { | |
756 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
757 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
758 | ||
759 | if (test_thread_flag(TIF_32BIT)) { | |
760 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
761 | ||
762 | if (fprs & FPRS_DL) | |
763 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
764 | sizeof(unsigned int) * 32); | |
765 | else | |
766 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
767 | sizeof(unsigned int) * 32); | |
768 | fpregs32->pr_qcnt = 0; | |
769 | fpregs32->pr_q_entrysize = 8; | |
770 | memset(&fpregs32->pr_q[0], 0, | |
771 | (sizeof(unsigned int) * 64)); | |
772 | if (fprs & FPRS_FEF) { | |
773 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
774 | fpregs32->pr_en = 1; | |
775 | } else { | |
776 | fpregs32->pr_fsr = 0; | |
777 | fpregs32->pr_en = 0; | |
778 | } | |
779 | } else { | |
780 | if(fprs & FPRS_DL) | |
781 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
782 | sizeof(unsigned int) * 32); | |
783 | else | |
784 | memset(&fpregs->pr_regs[0], 0, | |
785 | sizeof(unsigned int) * 32); | |
786 | if(fprs & FPRS_DU) | |
787 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
788 | sizeof(unsigned int) * 32); | |
789 | else | |
790 | memset(&fpregs->pr_regs[16], 0, | |
791 | sizeof(unsigned int) * 32); | |
792 | if(fprs & FPRS_FEF) { | |
793 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
794 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
795 | } else { | |
796 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
797 | } | |
798 | fpregs->pr_fprs = fprs; | |
799 | } | |
800 | return 1; | |
801 | } | |
802 | ||
803 | /* | |
804 | * sparc_execve() executes a new program after the asm stub has set | |
805 | * things up for us. This should basically do what I want it to. | |
806 | */ | |
807 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
808 | { | |
809 | int error, base = 0; | |
810 | char *filename; | |
811 | ||
812 | /* User register window flush is done by entry.S */ | |
813 | ||
814 | /* Check for indirect call. */ | |
815 | if (regs->u_regs[UREG_G1] == 0) | |
816 | base = 1; | |
817 | ||
818 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
819 | error = PTR_ERR(filename); | |
820 | if (IS_ERR(filename)) | |
821 | goto out; | |
822 | error = do_execve(filename, | |
823 | (char __user * __user *) | |
824 | regs->u_regs[base + UREG_I1], | |
825 | (char __user * __user *) | |
826 | regs->u_regs[base + UREG_I2], regs); | |
827 | putname(filename); | |
828 | if (!error) { | |
829 | fprs_write(0); | |
830 | current_thread_info()->xfsr[0] = 0; | |
831 | current_thread_info()->fpsaved[0] = 0; | |
832 | regs->tstate &= ~TSTATE_PEF; | |
833 | task_lock(current); | |
834 | current->ptrace &= ~PT_DTRACE; | |
835 | task_unlock(current); | |
836 | } | |
837 | out: | |
838 | return error; | |
839 | } | |
840 | ||
841 | unsigned long get_wchan(struct task_struct *task) | |
842 | { | |
843 | unsigned long pc, fp, bias = 0; | |
844 | unsigned long thread_info_base; | |
845 | struct reg_window *rw; | |
846 | unsigned long ret = 0; | |
847 | int count = 0; | |
848 | ||
849 | if (!task || task == current || | |
850 | task->state == TASK_RUNNING) | |
851 | goto out; | |
852 | ||
ee3eea16 | 853 | thread_info_base = (unsigned long) task_stack_page(task); |
1da177e4 | 854 | bias = STACK_BIAS; |
f3169641 | 855 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
856 | |
857 | do { | |
858 | /* Bogus frame pointer? */ | |
859 | if (fp < (thread_info_base + sizeof(struct thread_info)) || | |
860 | fp >= (thread_info_base + THREAD_SIZE)) | |
861 | break; | |
862 | rw = (struct reg_window *) fp; | |
863 | pc = rw->ins[7]; | |
864 | if (!in_sched_functions(pc)) { | |
865 | ret = pc; | |
866 | goto out; | |
867 | } | |
868 | fp = rw->ins[6] + bias; | |
869 | } while (++count < 16); | |
870 | ||
871 | out: | |
872 | return ret; | |
873 | } |