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1da177e4 LT |
1 | /* $Id: process.c,v 1.131 2002/02/09 19:49:30 davem Exp $ |
2 | * arch/sparc64/kernel/process.c | |
3 | * | |
4 | * Copyright (C) 1995, 1996 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) | |
6 | * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This file handles the architecture-dependent parts of process handling.. | |
11 | */ | |
12 | ||
13 | #include <stdarg.h> | |
14 | ||
1da177e4 LT |
15 | #include <linux/errno.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/kallsyms.h> | |
20 | #include <linux/mm.h> | |
4e950f6f | 21 | #include <linux/fs.h> |
1da177e4 | 22 | #include <linux/smp.h> |
1da177e4 LT |
23 | #include <linux/stddef.h> |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/user.h> | |
27 | #include <linux/a.out.h> | |
1da177e4 LT |
28 | #include <linux/reboot.h> |
29 | #include <linux/delay.h> | |
30 | #include <linux/compat.h> | |
038cb01e | 31 | #include <linux/tick.h> |
1da177e4 | 32 | #include <linux/init.h> |
e0204409 | 33 | #include <linux/cpu.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> |
1da177e4 LT |
51 | |
52 | /* #define VERBOSE_SHOWREGS */ | |
53 | ||
e0204409 | 54 | static void sparc64_yield(int cpu) |
1da177e4 | 55 | { |
30c91d57 DM |
56 | if (tlb_type != hypervisor) |
57 | return; | |
58 | ||
59 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
60 | smp_mb__after_clear_bit(); | |
61 | ||
e0204409 | 62 | while (!need_resched() && !cpu_is_offline(cpu)) { |
30c91d57 DM |
63 | unsigned long pstate; |
64 | ||
65 | /* Disable interrupts. */ | |
66 | __asm__ __volatile__( | |
67 | "rdpr %%pstate, %0\n\t" | |
68 | "andn %0, %1, %0\n\t" | |
69 | "wrpr %0, %%g0, %%pstate" | |
70 | : "=&r" (pstate) | |
71 | : "i" (PSTATE_IE)); | |
72 | ||
e0204409 | 73 | if (!need_resched() && !cpu_is_offline(cpu)) |
30c91d57 DM |
74 | sun4v_cpu_yield(); |
75 | ||
76 | /* Re-enable interrupts. */ | |
77 | __asm__ __volatile__( | |
78 | "rdpr %%pstate, %0\n\t" | |
79 | "or %0, %1, %0\n\t" | |
80 | "wrpr %0, %%g0, %%pstate" | |
81 | : "=&r" (pstate) | |
82 | : "i" (PSTATE_IE)); | |
1da177e4 | 83 | } |
1da177e4 | 84 | |
30c91d57 DM |
85 | set_thread_flag(TIF_POLLING_NRFLAG); |
86 | } | |
1da177e4 | 87 | |
30c91d57 | 88 | /* The idle loop on sparc64. */ |
1da177e4 LT |
89 | void cpu_idle(void) |
90 | { | |
e0204409 DM |
91 | int cpu = smp_processor_id(); |
92 | ||
1da177e4 | 93 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 | 94 | |
1da177e4 | 95 | while(1) { |
038cb01e | 96 | tick_nohz_stop_sched_tick(); |
e0204409 DM |
97 | |
98 | while (!need_resched() && !cpu_is_offline(cpu)) | |
99 | sparc64_yield(cpu); | |
100 | ||
038cb01e DM |
101 | tick_nohz_restart_sched_tick(); |
102 | ||
103 | preempt_enable_no_resched(); | |
e0204409 DM |
104 | |
105 | #ifdef CONFIG_HOTPLUG_CPU | |
106 | if (cpu_is_offline(cpu)) | |
107 | cpu_play_dead(); | |
108 | #endif | |
109 | ||
038cb01e DM |
110 | schedule(); |
111 | preempt_disable(); | |
1da177e4 LT |
112 | } |
113 | } | |
114 | ||
1da177e4 LT |
115 | extern char reboot_command []; |
116 | ||
117 | extern void (*prom_palette)(int); | |
118 | extern void (*prom_keyboard)(void); | |
119 | ||
120 | void machine_halt(void) | |
121 | { | |
22d6a1cb | 122 | sstate_halt(); |
c73fcc84 | 123 | if (prom_palette) |
1da177e4 LT |
124 | prom_palette (1); |
125 | if (prom_keyboard) | |
126 | prom_keyboard(); | |
127 | prom_halt(); | |
128 | panic("Halt failed!"); | |
129 | } | |
130 | ||
1da177e4 LT |
131 | void machine_alt_power_off(void) |
132 | { | |
22d6a1cb | 133 | sstate_poweroff(); |
c73fcc84 | 134 | if (prom_palette) |
1da177e4 LT |
135 | prom_palette(1); |
136 | if (prom_keyboard) | |
137 | prom_keyboard(); | |
138 | prom_halt_power_off(); | |
139 | panic("Power-off failed!"); | |
140 | } | |
141 | ||
142 | void machine_restart(char * cmd) | |
143 | { | |
144 | char *p; | |
145 | ||
22d6a1cb | 146 | sstate_reboot(); |
1da177e4 LT |
147 | p = strchr (reboot_command, '\n'); |
148 | if (p) *p = 0; | |
c73fcc84 | 149 | if (prom_palette) |
1da177e4 LT |
150 | prom_palette (1); |
151 | if (prom_keyboard) | |
152 | prom_keyboard(); | |
153 | if (cmd) | |
154 | prom_reboot(cmd); | |
155 | if (*reboot_command) | |
156 | prom_reboot(reboot_command); | |
157 | prom_reboot(""); | |
158 | panic("Reboot failed!"); | |
159 | } | |
160 | ||
959a85ad | 161 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
162 | static void show_regwindow32(struct pt_regs *regs) |
163 | { | |
164 | struct reg_window32 __user *rw; | |
165 | struct reg_window32 r_w; | |
166 | mm_segment_t old_fs; | |
167 | ||
168 | __asm__ __volatile__ ("flushw"); | |
169 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
170 | old_fs = get_fs(); | |
171 | set_fs (USER_DS); | |
172 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
173 | set_fs (old_fs); | |
174 | return; | |
175 | } | |
176 | ||
177 | set_fs (old_fs); | |
178 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
179 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
180 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
181 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
182 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
183 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
184 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
185 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
186 | } | |
959a85ad DM |
187 | #else |
188 | #define show_regwindow32(regs) do { } while (0) | |
189 | #endif | |
1da177e4 LT |
190 | |
191 | static void show_regwindow(struct pt_regs *regs) | |
192 | { | |
193 | struct reg_window __user *rw; | |
194 | struct reg_window *rwk; | |
195 | struct reg_window r_w; | |
196 | mm_segment_t old_fs; | |
197 | ||
198 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
199 | __asm__ __volatile__ ("flushw"); | |
200 | rw = (struct reg_window __user *) | |
201 | (regs->u_regs[14] + STACK_BIAS); | |
202 | rwk = (struct reg_window *) | |
203 | (regs->u_regs[14] + STACK_BIAS); | |
204 | if (!(regs->tstate & TSTATE_PRIV)) { | |
205 | old_fs = get_fs(); | |
206 | set_fs (USER_DS); | |
207 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
208 | set_fs (old_fs); | |
209 | return; | |
210 | } | |
211 | rwk = &r_w; | |
212 | set_fs (old_fs); | |
213 | } | |
214 | } else { | |
215 | show_regwindow32(regs); | |
216 | return; | |
217 | } | |
218 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
219 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
220 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
221 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
222 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
223 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
224 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
225 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
226 | if (regs->tstate & TSTATE_PRIV) | |
227 | print_symbol("I7: <%s>\n", rwk->ins[7]); | |
228 | } | |
229 | ||
230 | void show_stackframe(struct sparc_stackf *sf) | |
231 | { | |
232 | unsigned long size; | |
233 | unsigned long *stk; | |
234 | int i; | |
235 | ||
236 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n" | |
237 | "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
238 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3], | |
239 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
240 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n" | |
241 | "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n", | |
242 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3], | |
243 | sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc); | |
244 | printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n" | |
245 | "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n", | |
246 | (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1], | |
247 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
248 | sf->xxargs[0]); | |
249 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
250 | size -= STACKFRAME_SZ; | |
251 | stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ); | |
252 | i = 0; | |
253 | do { | |
254 | printk("s%d: %016lx\n", i++, *stk++); | |
255 | } while ((size -= sizeof(unsigned long))); | |
256 | } | |
257 | ||
258 | void show_stackframe32(struct sparc_stackf32 *sf) | |
259 | { | |
260 | unsigned long size; | |
261 | unsigned *stk; | |
262 | int i; | |
263 | ||
264 | printk("l0: %08x l1: %08x l2: %08x l3: %08x\n", | |
265 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]); | |
266 | printk("l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
267 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
268 | printk("i0: %08x i1: %08x i2: %08x i3: %08x\n", | |
269 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]); | |
270 | printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n", | |
271 | sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc); | |
272 | printk("sp: %08x x0: %08x x1: %08x x2: %08x\n" | |
273 | "x3: %08x x4: %08x x5: %08x xx: %08x\n", | |
274 | sf->structptr, sf->xargs[0], sf->xargs[1], | |
275 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
276 | sf->xxargs[0]); | |
277 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
278 | size -= STACKFRAME32_SZ; | |
279 | stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ); | |
280 | i = 0; | |
281 | do { | |
282 | printk("s%d: %08x\n", i++, *stk++); | |
283 | } while ((size -= sizeof(unsigned))); | |
284 | } | |
285 | ||
286 | #ifdef CONFIG_SMP | |
287 | static DEFINE_SPINLOCK(regdump_lock); | |
288 | #endif | |
289 | ||
290 | void __show_regs(struct pt_regs * regs) | |
291 | { | |
292 | #ifdef CONFIG_SMP | |
293 | unsigned long flags; | |
294 | ||
295 | /* Protect against xcall ipis which might lead to livelock on the lock */ | |
296 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" | |
297 | "wrpr %0, %1, %%pstate" | |
298 | : "=r" (flags) | |
299 | : "i" (PSTATE_IE)); | |
300 | spin_lock(®dump_lock); | |
301 | #endif | |
302 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, | |
303 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
304 | print_symbol("TPC: <%s>\n", regs->tpc); | |
305 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", | |
306 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
307 | regs->u_regs[3]); | |
308 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
309 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
310 | regs->u_regs[7]); | |
311 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
312 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
313 | regs->u_regs[11]); | |
314 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
315 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
316 | regs->u_regs[15]); | |
317 | print_symbol("RPC: <%s>\n", regs->u_regs[15]); | |
318 | show_regwindow(regs); | |
319 | #ifdef CONFIG_SMP | |
320 | spin_unlock(®dump_lock); | |
321 | __asm__ __volatile__("wrpr %0, 0, %%pstate" | |
322 | : : "r" (flags)); | |
323 | #endif | |
324 | } | |
325 | ||
326 | #ifdef VERBOSE_SHOWREGS | |
327 | static void idump_from_user (unsigned int *pc) | |
328 | { | |
329 | int i; | |
330 | int code; | |
331 | ||
332 | if((((unsigned long) pc) & 3)) | |
333 | return; | |
334 | ||
335 | pc -= 3; | |
336 | for(i = -3; i < 6; i++) { | |
337 | get_user(code, pc); | |
338 | printk("%c%08x%c",i?' ':'<',code,i?' ':'>'); | |
339 | pc++; | |
340 | } | |
341 | printk("\n"); | |
342 | } | |
343 | #endif | |
344 | ||
345 | void show_regs(struct pt_regs *regs) | |
346 | { | |
347 | #ifdef VERBOSE_SHOWREGS | |
348 | extern long etrap, etraptl1; | |
349 | #endif | |
350 | __show_regs(regs); | |
19a0d585 | 351 | #if 0 |
1da177e4 LT |
352 | #ifdef CONFIG_SMP |
353 | { | |
354 | extern void smp_report_regs(void); | |
355 | ||
356 | smp_report_regs(); | |
357 | } | |
358 | #endif | |
19a0d585 | 359 | #endif |
1da177e4 LT |
360 | |
361 | #ifdef VERBOSE_SHOWREGS | |
362 | if (regs->tpc >= &etrap && regs->tpc < &etraptl1 && | |
363 | regs->u_regs[14] >= (long)current - PAGE_SIZE && | |
364 | regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) { | |
365 | printk ("*********parent**********\n"); | |
366 | __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF)); | |
367 | idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc); | |
368 | printk ("*********endpar**********\n"); | |
369 | } | |
370 | #endif | |
371 | } | |
372 | ||
373 | void show_regs32(struct pt_regs32 *regs) | |
374 | { | |
375 | printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr, | |
376 | regs->pc, regs->npc, regs->y, print_tainted()); | |
377 | printk("g0: %08x g1: %08x g2: %08x g3: %08x ", | |
378 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
379 | regs->u_regs[3]); | |
380 | printk("g4: %08x g5: %08x g6: %08x g7: %08x\n", | |
381 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
382 | regs->u_regs[7]); | |
383 | printk("o0: %08x o1: %08x o2: %08x o3: %08x ", | |
384 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
385 | regs->u_regs[11]); | |
386 | printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n", | |
387 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
388 | regs->u_regs[15]); | |
389 | } | |
390 | ||
391 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
392 | { | |
f3169641 | 393 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
394 | unsigned long ret = 0xdeadbeefUL; |
395 | ||
396 | if (ti && ti->ksp) { | |
397 | unsigned long *sp; | |
398 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
399 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
400 | sp[14]) { | |
401 | unsigned long *fp; | |
402 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
403 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
404 | ret = fp[15]; | |
405 | } | |
406 | } | |
407 | return ret; | |
408 | } | |
409 | ||
410 | /* Free current thread data structures etc.. */ | |
411 | void exit_thread(void) | |
412 | { | |
413 | struct thread_info *t = current_thread_info(); | |
414 | ||
415 | if (t->utraps) { | |
416 | if (t->utraps[0] < 2) | |
417 | kfree (t->utraps); | |
418 | else | |
419 | t->utraps[0]--; | |
420 | } | |
421 | ||
422 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
423 | t->user_cntd0 = t->user_cntd1 = NULL; | |
424 | t->pcr_reg = 0; | |
425 | write_pcr(0); | |
426 | } | |
427 | } | |
428 | ||
429 | void flush_thread(void) | |
430 | { | |
431 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 432 | struct mm_struct *mm; |
1da177e4 | 433 | |
c0a79b22 MD |
434 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
435 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
436 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
437 | clear_ti_thread_flag(t, TIF_32BIT); | |
438 | else | |
439 | set_ti_thread_flag(t, TIF_32BIT); | |
440 | } | |
1da177e4 | 441 | |
74bf4312 DM |
442 | mm = t->task->mm; |
443 | if (mm) | |
98c5584c | 444 | tsb_context_switch(mm); |
1da177e4 | 445 | |
1da177e4 LT |
446 | set_thread_wsaved(0); |
447 | ||
448 | /* Turn off performance counters if on. */ | |
449 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
450 | t->user_cntd0 = t->user_cntd1 = NULL; | |
451 | t->pcr_reg = 0; | |
452 | write_pcr(0); | |
453 | } | |
454 | ||
455 | /* Clear FPU register state. */ | |
456 | t->fpsaved[0] = 0; | |
457 | ||
458 | if (get_thread_current_ds() != ASI_AIUS) | |
459 | set_fs(USER_DS); | |
460 | ||
461 | /* Init new signal delivery disposition. */ | |
462 | clear_thread_flag(TIF_NEWSIGNALS); | |
463 | } | |
464 | ||
465 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
466 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
467 | { | |
468 | unsigned long fp, distance, rval; | |
469 | ||
470 | if (!(test_thread_flag(TIF_32BIT))) { | |
471 | csp += STACK_BIAS; | |
472 | psp += STACK_BIAS; | |
473 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
474 | fp += STACK_BIAS; | |
475 | } else | |
476 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
477 | ||
478 | /* Now 8-byte align the stack as this is mandatory in the | |
479 | * Sparc ABI due to how register windows work. This hides | |
480 | * the restriction from thread libraries etc. -DaveM | |
481 | */ | |
482 | csp &= ~7UL; | |
483 | ||
484 | distance = fp - psp; | |
485 | rval = (csp - distance); | |
486 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
487 | rval = 0; | |
488 | else if (test_thread_flag(TIF_32BIT)) { | |
489 | if (put_user(((u32)csp), | |
490 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
491 | rval = 0; | |
492 | } else { | |
493 | if (put_user(((u64)csp - STACK_BIAS), | |
494 | &(((struct reg_window __user *)rval)->ins[6]))) | |
495 | rval = 0; | |
496 | else | |
497 | rval = rval - STACK_BIAS; | |
498 | } | |
499 | ||
500 | return rval; | |
501 | } | |
502 | ||
503 | /* Standard stuff. */ | |
504 | static inline void shift_window_buffer(int first_win, int last_win, | |
505 | struct thread_info *t) | |
506 | { | |
507 | int i; | |
508 | ||
509 | for (i = first_win; i < last_win; i++) { | |
510 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
511 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
512 | sizeof(struct reg_window)); | |
513 | } | |
514 | } | |
515 | ||
516 | void synchronize_user_stack(void) | |
517 | { | |
518 | struct thread_info *t = current_thread_info(); | |
519 | unsigned long window; | |
520 | ||
521 | flush_user_windows(); | |
522 | if ((window = get_thread_wsaved()) != 0) { | |
523 | int winsize = sizeof(struct reg_window); | |
524 | int bias = 0; | |
525 | ||
526 | if (test_thread_flag(TIF_32BIT)) | |
527 | winsize = sizeof(struct reg_window32); | |
528 | else | |
529 | bias = STACK_BIAS; | |
530 | ||
531 | window -= 1; | |
532 | do { | |
533 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
534 | struct reg_window *rwin = &t->reg_window[window]; | |
535 | ||
536 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
537 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
538 | set_thread_wsaved(get_thread_wsaved() - 1); | |
539 | } | |
540 | } while (window--); | |
541 | } | |
542 | } | |
543 | ||
314ef685 DM |
544 | static void stack_unaligned(unsigned long sp) |
545 | { | |
546 | siginfo_t info; | |
547 | ||
548 | info.si_signo = SIGBUS; | |
549 | info.si_errno = 0; | |
550 | info.si_code = BUS_ADRALN; | |
551 | info.si_addr = (void __user *) sp; | |
552 | info.si_trapno = 0; | |
553 | force_sig_info(SIGBUS, &info, current); | |
554 | } | |
555 | ||
1da177e4 LT |
556 | void fault_in_user_windows(void) |
557 | { | |
558 | struct thread_info *t = current_thread_info(); | |
559 | unsigned long window; | |
560 | int winsize = sizeof(struct reg_window); | |
561 | int bias = 0; | |
562 | ||
563 | if (test_thread_flag(TIF_32BIT)) | |
564 | winsize = sizeof(struct reg_window32); | |
565 | else | |
566 | bias = STACK_BIAS; | |
567 | ||
568 | flush_user_windows(); | |
569 | window = get_thread_wsaved(); | |
570 | ||
314ef685 | 571 | if (likely(window != 0)) { |
1da177e4 LT |
572 | window -= 1; |
573 | do { | |
574 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
575 | struct reg_window *rwin = &t->reg_window[window]; | |
576 | ||
314ef685 DM |
577 | if (unlikely(sp & 0x7UL)) |
578 | stack_unaligned(sp); | |
579 | ||
580 | if (unlikely(copy_to_user((char __user *)sp, | |
581 | rwin, winsize))) | |
1da177e4 LT |
582 | goto barf; |
583 | } while (window--); | |
584 | } | |
585 | set_thread_wsaved(0); | |
586 | return; | |
587 | ||
588 | barf: | |
589 | set_thread_wsaved(window + 1); | |
590 | do_exit(SIGILL); | |
591 | } | |
592 | ||
593 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
594 | unsigned long stack_start, | |
595 | struct pt_regs *regs, | |
596 | unsigned long stack_size) | |
597 | { | |
598 | int __user *parent_tid_ptr, *child_tid_ptr; | |
599 | ||
600 | #ifdef CONFIG_COMPAT | |
601 | if (test_thread_flag(TIF_32BIT)) { | |
602 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
603 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
604 | } else | |
605 | #endif | |
606 | { | |
607 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
608 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
609 | } | |
610 | ||
611 | return do_fork(clone_flags, stack_start, | |
612 | regs, stack_size, | |
613 | parent_tid_ptr, child_tid_ptr); | |
614 | } | |
615 | ||
616 | /* Copy a Sparc thread. The fork() return value conventions | |
617 | * under SunOS are nothing short of bletcherous: | |
618 | * Parent --> %o0 == childs pid, %o1 == 0 | |
619 | * Child --> %o0 == parents pid, %o1 == 1 | |
620 | */ | |
621 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
622 | unsigned long unused, | |
623 | struct task_struct *p, struct pt_regs *regs) | |
624 | { | |
ee3eea16 | 625 | struct thread_info *t = task_thread_info(p); |
1da177e4 LT |
626 | char *child_trap_frame; |
627 | ||
1da177e4 | 628 | /* Calculate offset to stack_frame & pt_regs */ |
ee3eea16 | 629 | child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ)); |
1da177e4 LT |
630 | memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ)); |
631 | ||
632 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 633 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 634 | t->new_child = 1; |
1da177e4 LT |
635 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
636 | t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf)); | |
637 | t->fpsaved[0] = 0; | |
638 | ||
639 | if (regs->tstate & TSTATE_PRIV) { | |
640 | /* Special case, if we are spawning a kernel thread from | |
641 | * a userspace task (via KMOD, NFS, or similar) we must | |
642 | * disable performance counters in the child because the | |
643 | * address space and protection realm are changing. | |
644 | */ | |
645 | if (t->flags & _TIF_PERFCTR) { | |
646 | t->user_cntd0 = t->user_cntd1 = NULL; | |
647 | t->pcr_reg = 0; | |
648 | t->flags &= ~_TIF_PERFCTR; | |
649 | } | |
650 | t->kregs->u_regs[UREG_FP] = t->ksp; | |
651 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); | |
652 | flush_register_windows(); | |
653 | memcpy((void *)(t->ksp + STACK_BIAS), | |
654 | (void *)(regs->u_regs[UREG_FP] + STACK_BIAS), | |
655 | sizeof(struct sparc_stackf)); | |
656 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; | |
657 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
658 | } else { | |
659 | if (t->flags & _TIF_32BIT) { | |
660 | sp &= 0x00000000ffffffffUL; | |
661 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
662 | } | |
663 | t->kregs->u_regs[UREG_FP] = sp; | |
664 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
665 | if (sp != regs->u_regs[UREG_FP]) { | |
666 | unsigned long csp; | |
667 | ||
668 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
669 | if (!csp) | |
670 | return -EFAULT; | |
671 | t->kregs->u_regs[UREG_FP] = csp; | |
672 | } | |
673 | if (t->utraps) | |
674 | t->utraps[0]++; | |
675 | } | |
676 | ||
677 | /* Set the return value for the child. */ | |
678 | t->kregs->u_regs[UREG_I0] = current->pid; | |
679 | t->kregs->u_regs[UREG_I1] = 1; | |
680 | ||
681 | /* Set the second return value for the parent. */ | |
682 | regs->u_regs[UREG_I1] = 0; | |
683 | ||
684 | if (clone_flags & CLONE_SETTLS) | |
685 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | /* | |
691 | * This is the mechanism for creating a new kernel thread. | |
692 | * | |
693 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
694 | * who haven't done an "execve()") should use this: it will work within | |
695 | * a system call from a "real" process, but the process memory space will | |
e5dd42e4 | 696 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
697 | */ |
698 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
699 | { | |
700 | long retval; | |
701 | ||
702 | /* If the parent runs before fn(arg) is called by the child, | |
703 | * the input registers of this function can be clobbered. | |
704 | * So we stash 'fn' and 'arg' into global registers which | |
705 | * will not be modified by the parent. | |
706 | */ | |
707 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
708 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
709 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
710 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
711 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
712 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
713 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
714 | " mov %%o0, %0\n\t" | |
715 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
716 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
717 | "mov %3, %%g1\n\t" | |
718 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
719 | /* Notreached by child. */ | |
720 | "1:" : | |
721 | "=r" (retval) : | |
722 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
723 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
724 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
725 | return retval; | |
726 | } | |
727 | ||
728 | /* | |
729 | * fill in the user structure for a core dump.. | |
730 | */ | |
731 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
732 | { | |
733 | /* Only should be used for SunOS and ancient a.out | |
734 | * SparcLinux binaries... Not worth implementing. | |
735 | */ | |
736 | memset(dump, 0, sizeof(struct user)); | |
737 | } | |
738 | ||
739 | typedef struct { | |
740 | union { | |
741 | unsigned int pr_regs[32]; | |
742 | unsigned long pr_dregs[16]; | |
743 | } pr_fr; | |
744 | unsigned int __unused; | |
745 | unsigned int pr_fsr; | |
746 | unsigned char pr_qcnt; | |
747 | unsigned char pr_q_entrysize; | |
748 | unsigned char pr_en; | |
749 | unsigned int pr_q[64]; | |
750 | } elf_fpregset_t32; | |
751 | ||
752 | /* | |
753 | * fill in the fpu structure for a core dump. | |
754 | */ | |
755 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
756 | { | |
757 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
758 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
759 | ||
760 | if (test_thread_flag(TIF_32BIT)) { | |
761 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
762 | ||
763 | if (fprs & FPRS_DL) | |
764 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
765 | sizeof(unsigned int) * 32); | |
766 | else | |
767 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
768 | sizeof(unsigned int) * 32); | |
769 | fpregs32->pr_qcnt = 0; | |
770 | fpregs32->pr_q_entrysize = 8; | |
771 | memset(&fpregs32->pr_q[0], 0, | |
772 | (sizeof(unsigned int) * 64)); | |
773 | if (fprs & FPRS_FEF) { | |
774 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
775 | fpregs32->pr_en = 1; | |
776 | } else { | |
777 | fpregs32->pr_fsr = 0; | |
778 | fpregs32->pr_en = 0; | |
779 | } | |
780 | } else { | |
781 | if(fprs & FPRS_DL) | |
782 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
783 | sizeof(unsigned int) * 32); | |
784 | else | |
785 | memset(&fpregs->pr_regs[0], 0, | |
786 | sizeof(unsigned int) * 32); | |
787 | if(fprs & FPRS_DU) | |
788 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
789 | sizeof(unsigned int) * 32); | |
790 | else | |
791 | memset(&fpregs->pr_regs[16], 0, | |
792 | sizeof(unsigned int) * 32); | |
793 | if(fprs & FPRS_FEF) { | |
794 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
795 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
796 | } else { | |
797 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
798 | } | |
799 | fpregs->pr_fprs = fprs; | |
800 | } | |
801 | return 1; | |
802 | } | |
803 | ||
804 | /* | |
805 | * sparc_execve() executes a new program after the asm stub has set | |
806 | * things up for us. This should basically do what I want it to. | |
807 | */ | |
808 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
809 | { | |
810 | int error, base = 0; | |
811 | char *filename; | |
812 | ||
813 | /* User register window flush is done by entry.S */ | |
814 | ||
815 | /* Check for indirect call. */ | |
816 | if (regs->u_regs[UREG_G1] == 0) | |
817 | base = 1; | |
818 | ||
819 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
820 | error = PTR_ERR(filename); | |
821 | if (IS_ERR(filename)) | |
822 | goto out; | |
823 | error = do_execve(filename, | |
824 | (char __user * __user *) | |
825 | regs->u_regs[base + UREG_I1], | |
826 | (char __user * __user *) | |
827 | regs->u_regs[base + UREG_I2], regs); | |
828 | putname(filename); | |
829 | if (!error) { | |
830 | fprs_write(0); | |
831 | current_thread_info()->xfsr[0] = 0; | |
832 | current_thread_info()->fpsaved[0] = 0; | |
833 | regs->tstate &= ~TSTATE_PEF; | |
834 | task_lock(current); | |
835 | current->ptrace &= ~PT_DTRACE; | |
836 | task_unlock(current); | |
837 | } | |
838 | out: | |
839 | return error; | |
840 | } | |
841 | ||
842 | unsigned long get_wchan(struct task_struct *task) | |
843 | { | |
844 | unsigned long pc, fp, bias = 0; | |
845 | unsigned long thread_info_base; | |
846 | struct reg_window *rw; | |
847 | unsigned long ret = 0; | |
848 | int count = 0; | |
849 | ||
850 | if (!task || task == current || | |
851 | task->state == TASK_RUNNING) | |
852 | goto out; | |
853 | ||
ee3eea16 | 854 | thread_info_base = (unsigned long) task_stack_page(task); |
1da177e4 | 855 | bias = STACK_BIAS; |
f3169641 | 856 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
857 | |
858 | do { | |
859 | /* Bogus frame pointer? */ | |
860 | if (fp < (thread_info_base + sizeof(struct thread_info)) || | |
861 | fp >= (thread_info_base + THREAD_SIZE)) | |
862 | break; | |
863 | rw = (struct reg_window *) fp; | |
864 | pc = rw->ins[7]; | |
865 | if (!in_sched_functions(pc)) { | |
866 | ret = pc; | |
867 | goto out; | |
868 | } | |
869 | fp = rw->ins[6] + bias; | |
870 | } while (++count < 16); | |
871 | ||
872 | out: | |
873 | return ret; | |
874 | } |