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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 LT |
31 | #include <linux/init.h> |
32 | ||
33 | #include <asm/oplib.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <asm/system.h> | |
36 | #include <asm/page.h> | |
37 | #include <asm/pgalloc.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/processor.h> | |
40 | #include <asm/pstate.h> | |
41 | #include <asm/elf.h> | |
42 | #include <asm/fpumacro.h> | |
43 | #include <asm/head.h> | |
44 | #include <asm/cpudata.h> | |
74bf4312 | 45 | #include <asm/mmu_context.h> |
1da177e4 | 46 | #include <asm/unistd.h> |
30c91d57 | 47 | #include <asm/hypervisor.h> |
1da177e4 LT |
48 | |
49 | /* #define VERBOSE_SHOWREGS */ | |
50 | ||
30c91d57 | 51 | static void sparc64_yield(void) |
1da177e4 | 52 | { |
30c91d57 DM |
53 | if (tlb_type != hypervisor) |
54 | return; | |
55 | ||
56 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
57 | smp_mb__after_clear_bit(); | |
58 | ||
59 | while (!need_resched()) { | |
60 | unsigned long pstate; | |
61 | ||
62 | /* Disable interrupts. */ | |
63 | __asm__ __volatile__( | |
64 | "rdpr %%pstate, %0\n\t" | |
65 | "andn %0, %1, %0\n\t" | |
66 | "wrpr %0, %%g0, %%pstate" | |
67 | : "=&r" (pstate) | |
68 | : "i" (PSTATE_IE)); | |
69 | ||
70 | if (!need_resched()) | |
71 | sun4v_cpu_yield(); | |
72 | ||
73 | /* Re-enable interrupts. */ | |
74 | __asm__ __volatile__( | |
75 | "rdpr %%pstate, %0\n\t" | |
76 | "or %0, %1, %0\n\t" | |
77 | "wrpr %0, %%g0, %%pstate" | |
78 | : "=&r" (pstate) | |
79 | : "i" (PSTATE_IE)); | |
1da177e4 | 80 | } |
1da177e4 | 81 | |
30c91d57 DM |
82 | set_thread_flag(TIF_POLLING_NRFLAG); |
83 | } | |
1da177e4 | 84 | |
30c91d57 | 85 | /* The idle loop on sparc64. */ |
1da177e4 LT |
86 | void cpu_idle(void) |
87 | { | |
88 | set_thread_flag(TIF_POLLING_NRFLAG); | |
64c7c8f8 | 89 | |
1da177e4 | 90 | while(1) { |
038cb01e DM |
91 | tick_nohz_stop_sched_tick(); |
92 | while (!need_resched()) | |
93 | sparc64_yield(); | |
94 | tick_nohz_restart_sched_tick(); | |
95 | ||
96 | preempt_enable_no_resched(); | |
97 | schedule(); | |
98 | preempt_disable(); | |
1da177e4 LT |
99 | } |
100 | } | |
101 | ||
1da177e4 LT |
102 | extern char reboot_command []; |
103 | ||
104 | extern void (*prom_palette)(int); | |
105 | extern void (*prom_keyboard)(void); | |
106 | ||
107 | void machine_halt(void) | |
108 | { | |
109 | if (!serial_console && prom_palette) | |
110 | prom_palette (1); | |
111 | if (prom_keyboard) | |
112 | prom_keyboard(); | |
113 | prom_halt(); | |
114 | panic("Halt failed!"); | |
115 | } | |
116 | ||
1da177e4 LT |
117 | void machine_alt_power_off(void) |
118 | { | |
119 | if (!serial_console && prom_palette) | |
120 | prom_palette(1); | |
121 | if (prom_keyboard) | |
122 | prom_keyboard(); | |
123 | prom_halt_power_off(); | |
124 | panic("Power-off failed!"); | |
125 | } | |
126 | ||
127 | void machine_restart(char * cmd) | |
128 | { | |
129 | char *p; | |
130 | ||
131 | p = strchr (reboot_command, '\n'); | |
132 | if (p) *p = 0; | |
133 | if (!serial_console && prom_palette) | |
134 | prom_palette (1); | |
135 | if (prom_keyboard) | |
136 | prom_keyboard(); | |
137 | if (cmd) | |
138 | prom_reboot(cmd); | |
139 | if (*reboot_command) | |
140 | prom_reboot(reboot_command); | |
141 | prom_reboot(""); | |
142 | panic("Reboot failed!"); | |
143 | } | |
144 | ||
959a85ad | 145 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
146 | static void show_regwindow32(struct pt_regs *regs) |
147 | { | |
148 | struct reg_window32 __user *rw; | |
149 | struct reg_window32 r_w; | |
150 | mm_segment_t old_fs; | |
151 | ||
152 | __asm__ __volatile__ ("flushw"); | |
153 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
154 | old_fs = get_fs(); | |
155 | set_fs (USER_DS); | |
156 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
157 | set_fs (old_fs); | |
158 | return; | |
159 | } | |
160 | ||
161 | set_fs (old_fs); | |
162 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
163 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
164 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
165 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
166 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
167 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
168 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
169 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
170 | } | |
959a85ad DM |
171 | #else |
172 | #define show_regwindow32(regs) do { } while (0) | |
173 | #endif | |
1da177e4 LT |
174 | |
175 | static void show_regwindow(struct pt_regs *regs) | |
176 | { | |
177 | struct reg_window __user *rw; | |
178 | struct reg_window *rwk; | |
179 | struct reg_window r_w; | |
180 | mm_segment_t old_fs; | |
181 | ||
182 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
183 | __asm__ __volatile__ ("flushw"); | |
184 | rw = (struct reg_window __user *) | |
185 | (regs->u_regs[14] + STACK_BIAS); | |
186 | rwk = (struct reg_window *) | |
187 | (regs->u_regs[14] + STACK_BIAS); | |
188 | if (!(regs->tstate & TSTATE_PRIV)) { | |
189 | old_fs = get_fs(); | |
190 | set_fs (USER_DS); | |
191 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
192 | set_fs (old_fs); | |
193 | return; | |
194 | } | |
195 | rwk = &r_w; | |
196 | set_fs (old_fs); | |
197 | } | |
198 | } else { | |
199 | show_regwindow32(regs); | |
200 | return; | |
201 | } | |
202 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
203 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
204 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
205 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
206 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
207 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
208 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
209 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
210 | if (regs->tstate & TSTATE_PRIV) | |
211 | print_symbol("I7: <%s>\n", rwk->ins[7]); | |
212 | } | |
213 | ||
214 | void show_stackframe(struct sparc_stackf *sf) | |
215 | { | |
216 | unsigned long size; | |
217 | unsigned long *stk; | |
218 | int i; | |
219 | ||
220 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n" | |
221 | "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
222 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3], | |
223 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
224 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n" | |
225 | "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n", | |
226 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3], | |
227 | sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc); | |
228 | printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n" | |
229 | "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n", | |
230 | (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1], | |
231 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
232 | sf->xxargs[0]); | |
233 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
234 | size -= STACKFRAME_SZ; | |
235 | stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ); | |
236 | i = 0; | |
237 | do { | |
238 | printk("s%d: %016lx\n", i++, *stk++); | |
239 | } while ((size -= sizeof(unsigned long))); | |
240 | } | |
241 | ||
242 | void show_stackframe32(struct sparc_stackf32 *sf) | |
243 | { | |
244 | unsigned long size; | |
245 | unsigned *stk; | |
246 | int i; | |
247 | ||
248 | printk("l0: %08x l1: %08x l2: %08x l3: %08x\n", | |
249 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]); | |
250 | printk("l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
251 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
252 | printk("i0: %08x i1: %08x i2: %08x i3: %08x\n", | |
253 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]); | |
254 | printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n", | |
255 | sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc); | |
256 | printk("sp: %08x x0: %08x x1: %08x x2: %08x\n" | |
257 | "x3: %08x x4: %08x x5: %08x xx: %08x\n", | |
258 | sf->structptr, sf->xargs[0], sf->xargs[1], | |
259 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
260 | sf->xxargs[0]); | |
261 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
262 | size -= STACKFRAME32_SZ; | |
263 | stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ); | |
264 | i = 0; | |
265 | do { | |
266 | printk("s%d: %08x\n", i++, *stk++); | |
267 | } while ((size -= sizeof(unsigned))); | |
268 | } | |
269 | ||
270 | #ifdef CONFIG_SMP | |
271 | static DEFINE_SPINLOCK(regdump_lock); | |
272 | #endif | |
273 | ||
274 | void __show_regs(struct pt_regs * regs) | |
275 | { | |
276 | #ifdef CONFIG_SMP | |
277 | unsigned long flags; | |
278 | ||
279 | /* Protect against xcall ipis which might lead to livelock on the lock */ | |
280 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" | |
281 | "wrpr %0, %1, %%pstate" | |
282 | : "=r" (flags) | |
283 | : "i" (PSTATE_IE)); | |
284 | spin_lock(®dump_lock); | |
285 | #endif | |
286 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, | |
287 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
288 | print_symbol("TPC: <%s>\n", regs->tpc); | |
289 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", | |
290 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
291 | regs->u_regs[3]); | |
292 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
293 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
294 | regs->u_regs[7]); | |
295 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
296 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
297 | regs->u_regs[11]); | |
298 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
299 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
300 | regs->u_regs[15]); | |
301 | print_symbol("RPC: <%s>\n", regs->u_regs[15]); | |
302 | show_regwindow(regs); | |
303 | #ifdef CONFIG_SMP | |
304 | spin_unlock(®dump_lock); | |
305 | __asm__ __volatile__("wrpr %0, 0, %%pstate" | |
306 | : : "r" (flags)); | |
307 | #endif | |
308 | } | |
309 | ||
310 | #ifdef VERBOSE_SHOWREGS | |
311 | static void idump_from_user (unsigned int *pc) | |
312 | { | |
313 | int i; | |
314 | int code; | |
315 | ||
316 | if((((unsigned long) pc) & 3)) | |
317 | return; | |
318 | ||
319 | pc -= 3; | |
320 | for(i = -3; i < 6; i++) { | |
321 | get_user(code, pc); | |
322 | printk("%c%08x%c",i?' ':'<',code,i?' ':'>'); | |
323 | pc++; | |
324 | } | |
325 | printk("\n"); | |
326 | } | |
327 | #endif | |
328 | ||
329 | void show_regs(struct pt_regs *regs) | |
330 | { | |
331 | #ifdef VERBOSE_SHOWREGS | |
332 | extern long etrap, etraptl1; | |
333 | #endif | |
334 | __show_regs(regs); | |
19a0d585 | 335 | #if 0 |
1da177e4 LT |
336 | #ifdef CONFIG_SMP |
337 | { | |
338 | extern void smp_report_regs(void); | |
339 | ||
340 | smp_report_regs(); | |
341 | } | |
342 | #endif | |
19a0d585 | 343 | #endif |
1da177e4 LT |
344 | |
345 | #ifdef VERBOSE_SHOWREGS | |
346 | if (regs->tpc >= &etrap && regs->tpc < &etraptl1 && | |
347 | regs->u_regs[14] >= (long)current - PAGE_SIZE && | |
348 | regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) { | |
349 | printk ("*********parent**********\n"); | |
350 | __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF)); | |
351 | idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc); | |
352 | printk ("*********endpar**********\n"); | |
353 | } | |
354 | #endif | |
355 | } | |
356 | ||
357 | void show_regs32(struct pt_regs32 *regs) | |
358 | { | |
359 | printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr, | |
360 | regs->pc, regs->npc, regs->y, print_tainted()); | |
361 | printk("g0: %08x g1: %08x g2: %08x g3: %08x ", | |
362 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
363 | regs->u_regs[3]); | |
364 | printk("g4: %08x g5: %08x g6: %08x g7: %08x\n", | |
365 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
366 | regs->u_regs[7]); | |
367 | printk("o0: %08x o1: %08x o2: %08x o3: %08x ", | |
368 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
369 | regs->u_regs[11]); | |
370 | printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n", | |
371 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
372 | regs->u_regs[15]); | |
373 | } | |
374 | ||
375 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
376 | { | |
f3169641 | 377 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
378 | unsigned long ret = 0xdeadbeefUL; |
379 | ||
380 | if (ti && ti->ksp) { | |
381 | unsigned long *sp; | |
382 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
383 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
384 | sp[14]) { | |
385 | unsigned long *fp; | |
386 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
387 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
388 | ret = fp[15]; | |
389 | } | |
390 | } | |
391 | return ret; | |
392 | } | |
393 | ||
394 | /* Free current thread data structures etc.. */ | |
395 | void exit_thread(void) | |
396 | { | |
397 | struct thread_info *t = current_thread_info(); | |
398 | ||
399 | if (t->utraps) { | |
400 | if (t->utraps[0] < 2) | |
401 | kfree (t->utraps); | |
402 | else | |
403 | t->utraps[0]--; | |
404 | } | |
405 | ||
406 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
407 | t->user_cntd0 = t->user_cntd1 = NULL; | |
408 | t->pcr_reg = 0; | |
409 | write_pcr(0); | |
410 | } | |
411 | } | |
412 | ||
413 | void flush_thread(void) | |
414 | { | |
415 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 416 | struct mm_struct *mm; |
1da177e4 | 417 | |
c0a79b22 MD |
418 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
419 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
420 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
421 | clear_ti_thread_flag(t, TIF_32BIT); | |
422 | else | |
423 | set_ti_thread_flag(t, TIF_32BIT); | |
424 | } | |
1da177e4 | 425 | |
74bf4312 DM |
426 | mm = t->task->mm; |
427 | if (mm) | |
98c5584c | 428 | tsb_context_switch(mm); |
1da177e4 | 429 | |
1da177e4 LT |
430 | set_thread_wsaved(0); |
431 | ||
432 | /* Turn off performance counters if on. */ | |
433 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
434 | t->user_cntd0 = t->user_cntd1 = NULL; | |
435 | t->pcr_reg = 0; | |
436 | write_pcr(0); | |
437 | } | |
438 | ||
439 | /* Clear FPU register state. */ | |
440 | t->fpsaved[0] = 0; | |
441 | ||
442 | if (get_thread_current_ds() != ASI_AIUS) | |
443 | set_fs(USER_DS); | |
444 | ||
445 | /* Init new signal delivery disposition. */ | |
446 | clear_thread_flag(TIF_NEWSIGNALS); | |
447 | } | |
448 | ||
449 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
450 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
451 | { | |
452 | unsigned long fp, distance, rval; | |
453 | ||
454 | if (!(test_thread_flag(TIF_32BIT))) { | |
455 | csp += STACK_BIAS; | |
456 | psp += STACK_BIAS; | |
457 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
458 | fp += STACK_BIAS; | |
459 | } else | |
460 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
461 | ||
462 | /* Now 8-byte align the stack as this is mandatory in the | |
463 | * Sparc ABI due to how register windows work. This hides | |
464 | * the restriction from thread libraries etc. -DaveM | |
465 | */ | |
466 | csp &= ~7UL; | |
467 | ||
468 | distance = fp - psp; | |
469 | rval = (csp - distance); | |
470 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
471 | rval = 0; | |
472 | else if (test_thread_flag(TIF_32BIT)) { | |
473 | if (put_user(((u32)csp), | |
474 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
475 | rval = 0; | |
476 | } else { | |
477 | if (put_user(((u64)csp - STACK_BIAS), | |
478 | &(((struct reg_window __user *)rval)->ins[6]))) | |
479 | rval = 0; | |
480 | else | |
481 | rval = rval - STACK_BIAS; | |
482 | } | |
483 | ||
484 | return rval; | |
485 | } | |
486 | ||
487 | /* Standard stuff. */ | |
488 | static inline void shift_window_buffer(int first_win, int last_win, | |
489 | struct thread_info *t) | |
490 | { | |
491 | int i; | |
492 | ||
493 | for (i = first_win; i < last_win; i++) { | |
494 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
495 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
496 | sizeof(struct reg_window)); | |
497 | } | |
498 | } | |
499 | ||
500 | void synchronize_user_stack(void) | |
501 | { | |
502 | struct thread_info *t = current_thread_info(); | |
503 | unsigned long window; | |
504 | ||
505 | flush_user_windows(); | |
506 | if ((window = get_thread_wsaved()) != 0) { | |
507 | int winsize = sizeof(struct reg_window); | |
508 | int bias = 0; | |
509 | ||
510 | if (test_thread_flag(TIF_32BIT)) | |
511 | winsize = sizeof(struct reg_window32); | |
512 | else | |
513 | bias = STACK_BIAS; | |
514 | ||
515 | window -= 1; | |
516 | do { | |
517 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
518 | struct reg_window *rwin = &t->reg_window[window]; | |
519 | ||
520 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
521 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
522 | set_thread_wsaved(get_thread_wsaved() - 1); | |
523 | } | |
524 | } while (window--); | |
525 | } | |
526 | } | |
527 | ||
314ef685 DM |
528 | static void stack_unaligned(unsigned long sp) |
529 | { | |
530 | siginfo_t info; | |
531 | ||
532 | info.si_signo = SIGBUS; | |
533 | info.si_errno = 0; | |
534 | info.si_code = BUS_ADRALN; | |
535 | info.si_addr = (void __user *) sp; | |
536 | info.si_trapno = 0; | |
537 | force_sig_info(SIGBUS, &info, current); | |
538 | } | |
539 | ||
1da177e4 LT |
540 | void fault_in_user_windows(void) |
541 | { | |
542 | struct thread_info *t = current_thread_info(); | |
543 | unsigned long window; | |
544 | int winsize = sizeof(struct reg_window); | |
545 | int bias = 0; | |
546 | ||
547 | if (test_thread_flag(TIF_32BIT)) | |
548 | winsize = sizeof(struct reg_window32); | |
549 | else | |
550 | bias = STACK_BIAS; | |
551 | ||
552 | flush_user_windows(); | |
553 | window = get_thread_wsaved(); | |
554 | ||
314ef685 | 555 | if (likely(window != 0)) { |
1da177e4 LT |
556 | window -= 1; |
557 | do { | |
558 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
559 | struct reg_window *rwin = &t->reg_window[window]; | |
560 | ||
314ef685 DM |
561 | if (unlikely(sp & 0x7UL)) |
562 | stack_unaligned(sp); | |
563 | ||
564 | if (unlikely(copy_to_user((char __user *)sp, | |
565 | rwin, winsize))) | |
1da177e4 LT |
566 | goto barf; |
567 | } while (window--); | |
568 | } | |
569 | set_thread_wsaved(0); | |
570 | return; | |
571 | ||
572 | barf: | |
573 | set_thread_wsaved(window + 1); | |
574 | do_exit(SIGILL); | |
575 | } | |
576 | ||
577 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
578 | unsigned long stack_start, | |
579 | struct pt_regs *regs, | |
580 | unsigned long stack_size) | |
581 | { | |
582 | int __user *parent_tid_ptr, *child_tid_ptr; | |
583 | ||
584 | #ifdef CONFIG_COMPAT | |
585 | if (test_thread_flag(TIF_32BIT)) { | |
586 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
587 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
588 | } else | |
589 | #endif | |
590 | { | |
591 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
592 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
593 | } | |
594 | ||
595 | return do_fork(clone_flags, stack_start, | |
596 | regs, stack_size, | |
597 | parent_tid_ptr, child_tid_ptr); | |
598 | } | |
599 | ||
600 | /* Copy a Sparc thread. The fork() return value conventions | |
601 | * under SunOS are nothing short of bletcherous: | |
602 | * Parent --> %o0 == childs pid, %o1 == 0 | |
603 | * Child --> %o0 == parents pid, %o1 == 1 | |
604 | */ | |
605 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
606 | unsigned long unused, | |
607 | struct task_struct *p, struct pt_regs *regs) | |
608 | { | |
ee3eea16 | 609 | struct thread_info *t = task_thread_info(p); |
1da177e4 LT |
610 | char *child_trap_frame; |
611 | ||
1da177e4 | 612 | /* Calculate offset to stack_frame & pt_regs */ |
ee3eea16 | 613 | child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ)); |
1da177e4 LT |
614 | memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ)); |
615 | ||
616 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 617 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 618 | t->new_child = 1; |
1da177e4 LT |
619 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
620 | t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf)); | |
621 | t->fpsaved[0] = 0; | |
622 | ||
623 | if (regs->tstate & TSTATE_PRIV) { | |
624 | /* Special case, if we are spawning a kernel thread from | |
625 | * a userspace task (via KMOD, NFS, or similar) we must | |
626 | * disable performance counters in the child because the | |
627 | * address space and protection realm are changing. | |
628 | */ | |
629 | if (t->flags & _TIF_PERFCTR) { | |
630 | t->user_cntd0 = t->user_cntd1 = NULL; | |
631 | t->pcr_reg = 0; | |
632 | t->flags &= ~_TIF_PERFCTR; | |
633 | } | |
634 | t->kregs->u_regs[UREG_FP] = t->ksp; | |
635 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); | |
636 | flush_register_windows(); | |
637 | memcpy((void *)(t->ksp + STACK_BIAS), | |
638 | (void *)(regs->u_regs[UREG_FP] + STACK_BIAS), | |
639 | sizeof(struct sparc_stackf)); | |
640 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; | |
641 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
642 | } else { | |
643 | if (t->flags & _TIF_32BIT) { | |
644 | sp &= 0x00000000ffffffffUL; | |
645 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
646 | } | |
647 | t->kregs->u_regs[UREG_FP] = sp; | |
648 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
649 | if (sp != regs->u_regs[UREG_FP]) { | |
650 | unsigned long csp; | |
651 | ||
652 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
653 | if (!csp) | |
654 | return -EFAULT; | |
655 | t->kregs->u_regs[UREG_FP] = csp; | |
656 | } | |
657 | if (t->utraps) | |
658 | t->utraps[0]++; | |
659 | } | |
660 | ||
661 | /* Set the return value for the child. */ | |
662 | t->kregs->u_regs[UREG_I0] = current->pid; | |
663 | t->kregs->u_regs[UREG_I1] = 1; | |
664 | ||
665 | /* Set the second return value for the parent. */ | |
666 | regs->u_regs[UREG_I1] = 0; | |
667 | ||
668 | if (clone_flags & CLONE_SETTLS) | |
669 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | /* | |
675 | * This is the mechanism for creating a new kernel thread. | |
676 | * | |
677 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
678 | * who haven't done an "execve()") should use this: it will work within | |
679 | * a system call from a "real" process, but the process memory space will | |
e5dd42e4 | 680 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
681 | */ |
682 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
683 | { | |
684 | long retval; | |
685 | ||
686 | /* If the parent runs before fn(arg) is called by the child, | |
687 | * the input registers of this function can be clobbered. | |
688 | * So we stash 'fn' and 'arg' into global registers which | |
689 | * will not be modified by the parent. | |
690 | */ | |
691 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
692 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
693 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
694 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
695 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
696 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
697 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
698 | " mov %%o0, %0\n\t" | |
699 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
700 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
701 | "mov %3, %%g1\n\t" | |
702 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
703 | /* Notreached by child. */ | |
704 | "1:" : | |
705 | "=r" (retval) : | |
706 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
707 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
708 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
709 | return retval; | |
710 | } | |
711 | ||
712 | /* | |
713 | * fill in the user structure for a core dump.. | |
714 | */ | |
715 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
716 | { | |
717 | /* Only should be used for SunOS and ancient a.out | |
718 | * SparcLinux binaries... Not worth implementing. | |
719 | */ | |
720 | memset(dump, 0, sizeof(struct user)); | |
721 | } | |
722 | ||
723 | typedef struct { | |
724 | union { | |
725 | unsigned int pr_regs[32]; | |
726 | unsigned long pr_dregs[16]; | |
727 | } pr_fr; | |
728 | unsigned int __unused; | |
729 | unsigned int pr_fsr; | |
730 | unsigned char pr_qcnt; | |
731 | unsigned char pr_q_entrysize; | |
732 | unsigned char pr_en; | |
733 | unsigned int pr_q[64]; | |
734 | } elf_fpregset_t32; | |
735 | ||
736 | /* | |
737 | * fill in the fpu structure for a core dump. | |
738 | */ | |
739 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
740 | { | |
741 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
742 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
743 | ||
744 | if (test_thread_flag(TIF_32BIT)) { | |
745 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
746 | ||
747 | if (fprs & FPRS_DL) | |
748 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
749 | sizeof(unsigned int) * 32); | |
750 | else | |
751 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
752 | sizeof(unsigned int) * 32); | |
753 | fpregs32->pr_qcnt = 0; | |
754 | fpregs32->pr_q_entrysize = 8; | |
755 | memset(&fpregs32->pr_q[0], 0, | |
756 | (sizeof(unsigned int) * 64)); | |
757 | if (fprs & FPRS_FEF) { | |
758 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
759 | fpregs32->pr_en = 1; | |
760 | } else { | |
761 | fpregs32->pr_fsr = 0; | |
762 | fpregs32->pr_en = 0; | |
763 | } | |
764 | } else { | |
765 | if(fprs & FPRS_DL) | |
766 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
767 | sizeof(unsigned int) * 32); | |
768 | else | |
769 | memset(&fpregs->pr_regs[0], 0, | |
770 | sizeof(unsigned int) * 32); | |
771 | if(fprs & FPRS_DU) | |
772 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
773 | sizeof(unsigned int) * 32); | |
774 | else | |
775 | memset(&fpregs->pr_regs[16], 0, | |
776 | sizeof(unsigned int) * 32); | |
777 | if(fprs & FPRS_FEF) { | |
778 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
779 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
780 | } else { | |
781 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
782 | } | |
783 | fpregs->pr_fprs = fprs; | |
784 | } | |
785 | return 1; | |
786 | } | |
787 | ||
788 | /* | |
789 | * sparc_execve() executes a new program after the asm stub has set | |
790 | * things up for us. This should basically do what I want it to. | |
791 | */ | |
792 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
793 | { | |
794 | int error, base = 0; | |
795 | char *filename; | |
796 | ||
797 | /* User register window flush is done by entry.S */ | |
798 | ||
799 | /* Check for indirect call. */ | |
800 | if (regs->u_regs[UREG_G1] == 0) | |
801 | base = 1; | |
802 | ||
803 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
804 | error = PTR_ERR(filename); | |
805 | if (IS_ERR(filename)) | |
806 | goto out; | |
807 | error = do_execve(filename, | |
808 | (char __user * __user *) | |
809 | regs->u_regs[base + UREG_I1], | |
810 | (char __user * __user *) | |
811 | regs->u_regs[base + UREG_I2], regs); | |
812 | putname(filename); | |
813 | if (!error) { | |
814 | fprs_write(0); | |
815 | current_thread_info()->xfsr[0] = 0; | |
816 | current_thread_info()->fpsaved[0] = 0; | |
817 | regs->tstate &= ~TSTATE_PEF; | |
818 | task_lock(current); | |
819 | current->ptrace &= ~PT_DTRACE; | |
820 | task_unlock(current); | |
821 | } | |
822 | out: | |
823 | return error; | |
824 | } | |
825 | ||
826 | unsigned long get_wchan(struct task_struct *task) | |
827 | { | |
828 | unsigned long pc, fp, bias = 0; | |
829 | unsigned long thread_info_base; | |
830 | struct reg_window *rw; | |
831 | unsigned long ret = 0; | |
832 | int count = 0; | |
833 | ||
834 | if (!task || task == current || | |
835 | task->state == TASK_RUNNING) | |
836 | goto out; | |
837 | ||
ee3eea16 | 838 | thread_info_base = (unsigned long) task_stack_page(task); |
1da177e4 | 839 | bias = STACK_BIAS; |
f3169641 | 840 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
841 | |
842 | do { | |
843 | /* Bogus frame pointer? */ | |
844 | if (fp < (thread_info_base + sizeof(struct thread_info)) || | |
845 | fp >= (thread_info_base + THREAD_SIZE)) | |
846 | break; | |
847 | rw = (struct reg_window *) fp; | |
848 | pc = rw->ins[7]; | |
849 | if (!in_sched_functions(pc)) { | |
850 | ret = pc; | |
851 | goto out; | |
852 | } | |
853 | fp = rw->ins[6] + bias; | |
854 | } while (++count < 16); | |
855 | ||
856 | out: | |
857 | return ret; | |
858 | } |