Commit | Line | Data |
---|---|---|
5526b7e4 | 1 | /* arch/sparc64/kernel/process.c |
1da177e4 | 2 | * |
93dae5b7 | 3 | * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
5 | * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | */ | |
7 | ||
8 | /* | |
9 | * This file handles the architecture-dependent parts of process handling.. | |
10 | */ | |
11 | ||
12 | #include <stdarg.h> | |
13 | ||
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
1da177e4 | 18 | #include <linux/mm.h> |
4e950f6f | 19 | #include <linux/fs.h> |
1da177e4 | 20 | #include <linux/smp.h> |
1da177e4 LT |
21 | #include <linux/stddef.h> |
22 | #include <linux/ptrace.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/user.h> | |
1da177e4 LT |
25 | #include <linux/delay.h> |
26 | #include <linux/compat.h> | |
038cb01e | 27 | #include <linux/tick.h> |
1da177e4 | 28 | #include <linux/init.h> |
e0204409 | 29 | #include <linux/cpu.h> |
b1422401 | 30 | #include <linux/elfcore.h> |
93dae5b7 | 31 | #include <linux/sysrq.h> |
1da177e4 | 32 | |
1da177e4 LT |
33 | #include <asm/uaccess.h> |
34 | #include <asm/system.h> | |
35 | #include <asm/page.h> | |
36 | #include <asm/pgalloc.h> | |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/processor.h> | |
39 | #include <asm/pstate.h> | |
40 | #include <asm/elf.h> | |
41 | #include <asm/fpumacro.h> | |
42 | #include <asm/head.h> | |
43 | #include <asm/cpudata.h> | |
74bf4312 | 44 | #include <asm/mmu_context.h> |
1da177e4 | 45 | #include <asm/unistd.h> |
30c91d57 | 46 | #include <asm/hypervisor.h> |
b1422401 | 47 | #include <asm/syscalls.h> |
93dae5b7 DM |
48 | #include <asm/irq_regs.h> |
49 | #include <asm/smp.h> | |
1da177e4 | 50 | |
4f70f7a9 DM |
51 | #include "kstack.h" |
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) { |
b8f8c3cf | 95 | tick_nohz_stop_sched_tick(1); |
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 | ||
959a85ad | 114 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
115 | static void show_regwindow32(struct pt_regs *regs) |
116 | { | |
117 | struct reg_window32 __user *rw; | |
118 | struct reg_window32 r_w; | |
119 | mm_segment_t old_fs; | |
120 | ||
121 | __asm__ __volatile__ ("flushw"); | |
122 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
123 | old_fs = get_fs(); | |
124 | set_fs (USER_DS); | |
125 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
126 | set_fs (old_fs); | |
127 | return; | |
128 | } | |
129 | ||
130 | set_fs (old_fs); | |
131 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
132 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
133 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
134 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
135 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
136 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
137 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
138 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
139 | } | |
959a85ad DM |
140 | #else |
141 | #define show_regwindow32(regs) do { } while (0) | |
142 | #endif | |
1da177e4 LT |
143 | |
144 | static void show_regwindow(struct pt_regs *regs) | |
145 | { | |
146 | struct reg_window __user *rw; | |
147 | struct reg_window *rwk; | |
148 | struct reg_window r_w; | |
149 | mm_segment_t old_fs; | |
150 | ||
151 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
152 | __asm__ __volatile__ ("flushw"); | |
153 | rw = (struct reg_window __user *) | |
154 | (regs->u_regs[14] + STACK_BIAS); | |
155 | rwk = (struct reg_window *) | |
156 | (regs->u_regs[14] + STACK_BIAS); | |
157 | if (!(regs->tstate & TSTATE_PRIV)) { | |
158 | old_fs = get_fs(); | |
159 | set_fs (USER_DS); | |
160 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
161 | set_fs (old_fs); | |
162 | return; | |
163 | } | |
164 | rwk = &r_w; | |
165 | set_fs (old_fs); | |
166 | } | |
167 | } else { | |
168 | show_regwindow32(regs); | |
169 | return; | |
170 | } | |
171 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
172 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
173 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
174 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
175 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
176 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
177 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
178 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
179 | if (regs->tstate & TSTATE_PRIV) | |
4fe3ebec | 180 | printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
1da177e4 LT |
181 | } |
182 | ||
dbf3e950 | 183 | void show_regs(struct pt_regs *regs) |
1da177e4 | 184 | { |
1da177e4 LT |
185 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
186 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
4fe3ebec | 187 | printk("TPC: <%pS>\n", (void *) regs->tpc); |
1da177e4 LT |
188 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
189 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
190 | regs->u_regs[3]); | |
191 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
192 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
193 | regs->u_regs[7]); | |
194 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
195 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
196 | regs->u_regs[11]); | |
197 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
198 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
199 | regs->u_regs[15]); | |
4fe3ebec | 200 | printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
1da177e4 | 201 | show_regwindow(regs); |
1da177e4 LT |
202 | } |
203 | ||
93dae5b7 DM |
204 | struct global_reg_snapshot global_reg_snapshot[NR_CPUS]; |
205 | static DEFINE_SPINLOCK(global_reg_snapshot_lock); | |
206 | ||
207 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, | |
208 | int this_cpu) | |
209 | { | |
210 | flushw_all(); | |
211 | ||
212 | global_reg_snapshot[this_cpu].tstate = regs->tstate; | |
213 | global_reg_snapshot[this_cpu].tpc = regs->tpc; | |
214 | global_reg_snapshot[this_cpu].tnpc = regs->tnpc; | |
215 | global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7]; | |
216 | ||
217 | if (regs->tstate & TSTATE_PRIV) { | |
218 | struct reg_window *rw; | |
219 | ||
220 | rw = (struct reg_window *) | |
221 | (regs->u_regs[UREG_FP] + STACK_BIAS); | |
4f70f7a9 | 222 | if (kstack_valid(tp, (unsigned long) rw)) { |
5afe2738 DM |
223 | global_reg_snapshot[this_cpu].i7 = rw->ins[7]; |
224 | rw = (struct reg_window *) | |
225 | (rw->ins[6] + STACK_BIAS); | |
4f70f7a9 | 226 | if (kstack_valid(tp, (unsigned long) rw)) |
5afe2738 DM |
227 | global_reg_snapshot[this_cpu].rpc = rw->ins[7]; |
228 | } | |
229 | } else { | |
93dae5b7 | 230 | global_reg_snapshot[this_cpu].i7 = 0; |
5afe2738 DM |
231 | global_reg_snapshot[this_cpu].rpc = 0; |
232 | } | |
93dae5b7 DM |
233 | global_reg_snapshot[this_cpu].thread = tp; |
234 | } | |
235 | ||
236 | /* In order to avoid hangs we do not try to synchronize with the | |
237 | * global register dump client cpus. The last store they make is to | |
238 | * the thread pointer, so do a short poll waiting for that to become | |
239 | * non-NULL. | |
240 | */ | |
241 | static void __global_reg_poll(struct global_reg_snapshot *gp) | |
242 | { | |
243 | int limit = 0; | |
244 | ||
245 | while (!gp->thread && ++limit < 100) { | |
246 | barrier(); | |
247 | udelay(1); | |
248 | } | |
249 | } | |
250 | ||
09ee167c | 251 | void __trigger_all_cpu_backtrace(void) |
93dae5b7 DM |
252 | { |
253 | struct thread_info *tp = current_thread_info(); | |
254 | struct pt_regs *regs = get_irq_regs(); | |
93dae5b7 DM |
255 | unsigned long flags; |
256 | int this_cpu, cpu; | |
257 | ||
258 | if (!regs) | |
259 | regs = tp->kregs; | |
260 | ||
261 | spin_lock_irqsave(&global_reg_snapshot_lock, flags); | |
262 | ||
263 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); | |
264 | ||
265 | this_cpu = raw_smp_processor_id(); | |
266 | ||
267 | __global_reg_self(tp, regs, this_cpu); | |
268 | ||
269 | smp_fetch_global_regs(); | |
270 | ||
271 | for_each_online_cpu(cpu) { | |
272 | struct global_reg_snapshot *gp = &global_reg_snapshot[cpu]; | |
93dae5b7 DM |
273 | |
274 | __global_reg_poll(gp); | |
275 | ||
276 | tp = gp->thread; | |
277 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", | |
278 | (cpu == this_cpu ? '*' : ' '), cpu, | |
279 | gp->tstate, gp->tpc, gp->tnpc, | |
280 | ((tp && tp->task) ? tp->task->comm : "NULL"), | |
281 | ((tp && tp->task) ? tp->task->pid : -1)); | |
4fe3ebec | 282 | |
93dae5b7 | 283 | if (gp->tstate & TSTATE_PRIV) { |
5afe2738 | 284 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
4fe3ebec DM |
285 | (void *) gp->tpc, |
286 | (void *) gp->o7, | |
5afe2738 DM |
287 | (void *) gp->i7, |
288 | (void *) gp->rpc); | |
4fe3ebec | 289 | } else { |
5afe2738 DM |
290 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
291 | gp->tpc, gp->o7, gp->i7, gp->rpc); | |
93dae5b7 DM |
292 | } |
293 | } | |
294 | ||
295 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); | |
296 | ||
297 | spin_unlock_irqrestore(&global_reg_snapshot_lock, flags); | |
298 | } | |
299 | ||
09ee167c DM |
300 | #ifdef CONFIG_MAGIC_SYSRQ |
301 | ||
302 | static void sysrq_handle_globreg(int key, struct tty_struct *tty) | |
303 | { | |
304 | __trigger_all_cpu_backtrace(); | |
305 | } | |
306 | ||
93dae5b7 DM |
307 | static struct sysrq_key_op sparc_globalreg_op = { |
308 | .handler = sysrq_handle_globreg, | |
309 | .help_msg = "Globalregs", | |
310 | .action_msg = "Show Global CPU Regs", | |
311 | }; | |
312 | ||
313 | static int __init sparc_globreg_init(void) | |
314 | { | |
315 | return register_sysrq_key('y', &sparc_globalreg_op); | |
316 | } | |
317 | ||
318 | core_initcall(sparc_globreg_init); | |
319 | ||
320 | #endif | |
321 | ||
1da177e4 LT |
322 | unsigned long thread_saved_pc(struct task_struct *tsk) |
323 | { | |
f3169641 | 324 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
325 | unsigned long ret = 0xdeadbeefUL; |
326 | ||
327 | if (ti && ti->ksp) { | |
328 | unsigned long *sp; | |
329 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
330 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
331 | sp[14]) { | |
332 | unsigned long *fp; | |
333 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
334 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
335 | ret = fp[15]; | |
336 | } | |
337 | } | |
338 | return ret; | |
339 | } | |
340 | ||
341 | /* Free current thread data structures etc.. */ | |
342 | void exit_thread(void) | |
343 | { | |
344 | struct thread_info *t = current_thread_info(); | |
345 | ||
346 | if (t->utraps) { | |
347 | if (t->utraps[0] < 2) | |
348 | kfree (t->utraps); | |
349 | else | |
350 | t->utraps[0]--; | |
351 | } | |
352 | ||
353 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
354 | t->user_cntd0 = t->user_cntd1 = NULL; | |
355 | t->pcr_reg = 0; | |
356 | write_pcr(0); | |
357 | } | |
358 | } | |
359 | ||
360 | void flush_thread(void) | |
361 | { | |
362 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 363 | struct mm_struct *mm; |
1da177e4 | 364 | |
c0a79b22 MD |
365 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
366 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
367 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
368 | clear_ti_thread_flag(t, TIF_32BIT); | |
369 | else | |
370 | set_ti_thread_flag(t, TIF_32BIT); | |
371 | } | |
1da177e4 | 372 | |
74bf4312 DM |
373 | mm = t->task->mm; |
374 | if (mm) | |
98c5584c | 375 | tsb_context_switch(mm); |
1da177e4 | 376 | |
1da177e4 LT |
377 | set_thread_wsaved(0); |
378 | ||
379 | /* Turn off performance counters if on. */ | |
380 | if (test_and_clear_thread_flag(TIF_PERFCTR)) { | |
381 | t->user_cntd0 = t->user_cntd1 = NULL; | |
382 | t->pcr_reg = 0; | |
383 | write_pcr(0); | |
384 | } | |
385 | ||
386 | /* Clear FPU register state. */ | |
387 | t->fpsaved[0] = 0; | |
388 | ||
389 | if (get_thread_current_ds() != ASI_AIUS) | |
390 | set_fs(USER_DS); | |
1da177e4 LT |
391 | } |
392 | ||
393 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
394 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
395 | { | |
396 | unsigned long fp, distance, rval; | |
397 | ||
398 | if (!(test_thread_flag(TIF_32BIT))) { | |
399 | csp += STACK_BIAS; | |
400 | psp += STACK_BIAS; | |
401 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
402 | fp += STACK_BIAS; | |
403 | } else | |
404 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
405 | ||
406 | /* Now 8-byte align the stack as this is mandatory in the | |
407 | * Sparc ABI due to how register windows work. This hides | |
408 | * the restriction from thread libraries etc. -DaveM | |
409 | */ | |
410 | csp &= ~7UL; | |
411 | ||
412 | distance = fp - psp; | |
413 | rval = (csp - distance); | |
414 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
415 | rval = 0; | |
416 | else if (test_thread_flag(TIF_32BIT)) { | |
417 | if (put_user(((u32)csp), | |
418 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
419 | rval = 0; | |
420 | } else { | |
421 | if (put_user(((u64)csp - STACK_BIAS), | |
422 | &(((struct reg_window __user *)rval)->ins[6]))) | |
423 | rval = 0; | |
424 | else | |
425 | rval = rval - STACK_BIAS; | |
426 | } | |
427 | ||
428 | return rval; | |
429 | } | |
430 | ||
431 | /* Standard stuff. */ | |
432 | static inline void shift_window_buffer(int first_win, int last_win, | |
433 | struct thread_info *t) | |
434 | { | |
435 | int i; | |
436 | ||
437 | for (i = first_win; i < last_win; i++) { | |
438 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
439 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
440 | sizeof(struct reg_window)); | |
441 | } | |
442 | } | |
443 | ||
444 | void synchronize_user_stack(void) | |
445 | { | |
446 | struct thread_info *t = current_thread_info(); | |
447 | unsigned long window; | |
448 | ||
449 | flush_user_windows(); | |
450 | if ((window = get_thread_wsaved()) != 0) { | |
451 | int winsize = sizeof(struct reg_window); | |
452 | int bias = 0; | |
453 | ||
454 | if (test_thread_flag(TIF_32BIT)) | |
455 | winsize = sizeof(struct reg_window32); | |
456 | else | |
457 | bias = STACK_BIAS; | |
458 | ||
459 | window -= 1; | |
460 | do { | |
461 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
462 | struct reg_window *rwin = &t->reg_window[window]; | |
463 | ||
464 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
465 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
466 | set_thread_wsaved(get_thread_wsaved() - 1); | |
467 | } | |
468 | } while (window--); | |
469 | } | |
470 | } | |
471 | ||
314ef685 DM |
472 | static void stack_unaligned(unsigned long sp) |
473 | { | |
474 | siginfo_t info; | |
475 | ||
476 | info.si_signo = SIGBUS; | |
477 | info.si_errno = 0; | |
478 | info.si_code = BUS_ADRALN; | |
479 | info.si_addr = (void __user *) sp; | |
480 | info.si_trapno = 0; | |
481 | force_sig_info(SIGBUS, &info, current); | |
482 | } | |
483 | ||
1da177e4 LT |
484 | void fault_in_user_windows(void) |
485 | { | |
486 | struct thread_info *t = current_thread_info(); | |
487 | unsigned long window; | |
488 | int winsize = sizeof(struct reg_window); | |
489 | int bias = 0; | |
490 | ||
491 | if (test_thread_flag(TIF_32BIT)) | |
492 | winsize = sizeof(struct reg_window32); | |
493 | else | |
494 | bias = STACK_BIAS; | |
495 | ||
496 | flush_user_windows(); | |
497 | window = get_thread_wsaved(); | |
498 | ||
314ef685 | 499 | if (likely(window != 0)) { |
1da177e4 LT |
500 | window -= 1; |
501 | do { | |
502 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
503 | struct reg_window *rwin = &t->reg_window[window]; | |
504 | ||
314ef685 DM |
505 | if (unlikely(sp & 0x7UL)) |
506 | stack_unaligned(sp); | |
507 | ||
508 | if (unlikely(copy_to_user((char __user *)sp, | |
509 | rwin, winsize))) | |
1da177e4 LT |
510 | goto barf; |
511 | } while (window--); | |
512 | } | |
513 | set_thread_wsaved(0); | |
514 | return; | |
515 | ||
516 | barf: | |
517 | set_thread_wsaved(window + 1); | |
518 | do_exit(SIGILL); | |
519 | } | |
520 | ||
521 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
522 | unsigned long stack_start, | |
523 | struct pt_regs *regs, | |
524 | unsigned long stack_size) | |
525 | { | |
526 | int __user *parent_tid_ptr, *child_tid_ptr; | |
1e38c126 DM |
527 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
528 | long ret; | |
1da177e4 LT |
529 | |
530 | #ifdef CONFIG_COMPAT | |
531 | if (test_thread_flag(TIF_32BIT)) { | |
532 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
533 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
534 | } else | |
535 | #endif | |
536 | { | |
537 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
538 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
539 | } | |
540 | ||
1e38c126 DM |
541 | ret = do_fork(clone_flags, stack_start, |
542 | regs, stack_size, | |
543 | parent_tid_ptr, child_tid_ptr); | |
544 | ||
545 | /* If we get an error and potentially restart the system | |
546 | * call, we're screwed because copy_thread() clobbered | |
547 | * the parent's %o1. So detect that case and restore it | |
548 | * here. | |
549 | */ | |
550 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
551 | regs->u_regs[UREG_I1] = orig_i1; | |
552 | ||
553 | return ret; | |
1da177e4 LT |
554 | } |
555 | ||
556 | /* Copy a Sparc thread. The fork() return value conventions | |
557 | * under SunOS are nothing short of bletcherous: | |
558 | * Parent --> %o0 == childs pid, %o1 == 0 | |
559 | * Child --> %o0 == parents pid, %o1 == 1 | |
560 | */ | |
561 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
562 | unsigned long unused, | |
563 | struct task_struct *p, struct pt_regs *regs) | |
564 | { | |
ee3eea16 | 565 | struct thread_info *t = task_thread_info(p); |
a051bc5b DM |
566 | struct sparc_stackf *parent_sf; |
567 | unsigned long child_stack_sz; | |
1da177e4 | 568 | char *child_trap_frame; |
a051bc5b | 569 | int kernel_thread; |
1da177e4 | 570 | |
a051bc5b DM |
571 | kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0; |
572 | parent_sf = ((struct sparc_stackf *) regs) - 1; | |
1da177e4 | 573 | |
a051bc5b DM |
574 | /* Calculate offset to stack_frame & pt_regs */ |
575 | child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) + | |
576 | (kernel_thread ? STACKFRAME_SZ : 0)); | |
577 | child_trap_frame = (task_stack_page(p) + | |
578 | (THREAD_SIZE - child_stack_sz)); | |
579 | memcpy(child_trap_frame, parent_sf, child_stack_sz); | |
580 | ||
581 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | | |
582 | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 583 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 584 | t->new_child = 1; |
1da177e4 | 585 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
a051bc5b DM |
586 | t->kregs = (struct pt_regs *) (child_trap_frame + |
587 | sizeof(struct sparc_stackf)); | |
1da177e4 LT |
588 | t->fpsaved[0] = 0; |
589 | ||
a051bc5b DM |
590 | if (kernel_thread) { |
591 | struct sparc_stackf *child_sf = (struct sparc_stackf *) | |
592 | (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ)); | |
593 | ||
594 | /* Zero terminate the stack backtrace. */ | |
595 | child_sf->fp = NULL; | |
596 | t->kregs->u_regs[UREG_FP] = | |
597 | ((unsigned long) child_sf) - STACK_BIAS; | |
598 | ||
1da177e4 | 599 | /* Special case, if we are spawning a kernel thread from |
184b6c76 JB |
600 | * a userspace task (usermode helper, NFS or similar), we |
601 | * must disable performance counters in the child because | |
602 | * the address space and protection realm are changing. | |
1da177e4 LT |
603 | */ |
604 | if (t->flags & _TIF_PERFCTR) { | |
605 | t->user_cntd0 = t->user_cntd1 = NULL; | |
606 | t->pcr_reg = 0; | |
607 | t->flags &= ~_TIF_PERFCTR; | |
608 | } | |
1da177e4 | 609 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); |
1da177e4 LT |
610 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; |
611 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
612 | } else { | |
613 | if (t->flags & _TIF_32BIT) { | |
614 | sp &= 0x00000000ffffffffUL; | |
615 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
616 | } | |
617 | t->kregs->u_regs[UREG_FP] = sp; | |
618 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
619 | if (sp != regs->u_regs[UREG_FP]) { | |
620 | unsigned long csp; | |
621 | ||
622 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
623 | if (!csp) | |
624 | return -EFAULT; | |
625 | t->kregs->u_regs[UREG_FP] = csp; | |
626 | } | |
627 | if (t->utraps) | |
628 | t->utraps[0]++; | |
629 | } | |
630 | ||
631 | /* Set the return value for the child. */ | |
632 | t->kregs->u_regs[UREG_I0] = current->pid; | |
633 | t->kregs->u_regs[UREG_I1] = 1; | |
634 | ||
635 | /* Set the second return value for the parent. */ | |
636 | regs->u_regs[UREG_I1] = 0; | |
637 | ||
638 | if (clone_flags & CLONE_SETTLS) | |
639 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | /* | |
645 | * This is the mechanism for creating a new kernel thread. | |
646 | * | |
647 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
648 | * who haven't done an "execve()") should use this: it will work within | |
649 | * a system call from a "real" process, but the process memory space will | |
e5dd42e4 | 650 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
651 | */ |
652 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
653 | { | |
654 | long retval; | |
655 | ||
656 | /* If the parent runs before fn(arg) is called by the child, | |
657 | * the input registers of this function can be clobbered. | |
658 | * So we stash 'fn' and 'arg' into global registers which | |
659 | * will not be modified by the parent. | |
660 | */ | |
661 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
662 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
663 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
664 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
665 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
666 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
667 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
668 | " mov %%o0, %0\n\t" | |
669 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
670 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
671 | "mov %3, %%g1\n\t" | |
672 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
673 | /* Notreached by child. */ | |
674 | "1:" : | |
675 | "=r" (retval) : | |
676 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
677 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
678 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
679 | return retval; | |
680 | } | |
681 | ||
1da177e4 LT |
682 | typedef struct { |
683 | union { | |
684 | unsigned int pr_regs[32]; | |
685 | unsigned long pr_dregs[16]; | |
686 | } pr_fr; | |
687 | unsigned int __unused; | |
688 | unsigned int pr_fsr; | |
689 | unsigned char pr_qcnt; | |
690 | unsigned char pr_q_entrysize; | |
691 | unsigned char pr_en; | |
692 | unsigned int pr_q[64]; | |
693 | } elf_fpregset_t32; | |
694 | ||
695 | /* | |
696 | * fill in the fpu structure for a core dump. | |
697 | */ | |
698 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
699 | { | |
700 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
701 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
702 | ||
703 | if (test_thread_flag(TIF_32BIT)) { | |
704 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
705 | ||
706 | if (fprs & FPRS_DL) | |
707 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
708 | sizeof(unsigned int) * 32); | |
709 | else | |
710 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
711 | sizeof(unsigned int) * 32); | |
712 | fpregs32->pr_qcnt = 0; | |
713 | fpregs32->pr_q_entrysize = 8; | |
714 | memset(&fpregs32->pr_q[0], 0, | |
715 | (sizeof(unsigned int) * 64)); | |
716 | if (fprs & FPRS_FEF) { | |
717 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
718 | fpregs32->pr_en = 1; | |
719 | } else { | |
720 | fpregs32->pr_fsr = 0; | |
721 | fpregs32->pr_en = 0; | |
722 | } | |
723 | } else { | |
724 | if(fprs & FPRS_DL) | |
725 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
726 | sizeof(unsigned int) * 32); | |
727 | else | |
728 | memset(&fpregs->pr_regs[0], 0, | |
729 | sizeof(unsigned int) * 32); | |
730 | if(fprs & FPRS_DU) | |
731 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
732 | sizeof(unsigned int) * 32); | |
733 | else | |
734 | memset(&fpregs->pr_regs[16], 0, | |
735 | sizeof(unsigned int) * 32); | |
736 | if(fprs & FPRS_FEF) { | |
737 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
738 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
739 | } else { | |
740 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
741 | } | |
742 | fpregs->pr_fprs = fprs; | |
743 | } | |
744 | return 1; | |
745 | } | |
746 | ||
747 | /* | |
748 | * sparc_execve() executes a new program after the asm stub has set | |
749 | * things up for us. This should basically do what I want it to. | |
750 | */ | |
751 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
752 | { | |
753 | int error, base = 0; | |
754 | char *filename; | |
755 | ||
756 | /* User register window flush is done by entry.S */ | |
757 | ||
758 | /* Check for indirect call. */ | |
759 | if (regs->u_regs[UREG_G1] == 0) | |
760 | base = 1; | |
761 | ||
762 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
763 | error = PTR_ERR(filename); | |
764 | if (IS_ERR(filename)) | |
765 | goto out; | |
766 | error = do_execve(filename, | |
767 | (char __user * __user *) | |
768 | regs->u_regs[base + UREG_I1], | |
769 | (char __user * __user *) | |
770 | regs->u_regs[base + UREG_I2], regs); | |
771 | putname(filename); | |
772 | if (!error) { | |
773 | fprs_write(0); | |
774 | current_thread_info()->xfsr[0] = 0; | |
775 | current_thread_info()->fpsaved[0] = 0; | |
776 | regs->tstate &= ~TSTATE_PEF; | |
1da177e4 LT |
777 | } |
778 | out: | |
779 | return error; | |
780 | } | |
781 | ||
782 | unsigned long get_wchan(struct task_struct *task) | |
783 | { | |
784 | unsigned long pc, fp, bias = 0; | |
4f70f7a9 | 785 | struct thread_info *tp; |
1da177e4 LT |
786 | struct reg_window *rw; |
787 | unsigned long ret = 0; | |
788 | int count = 0; | |
789 | ||
790 | if (!task || task == current || | |
791 | task->state == TASK_RUNNING) | |
792 | goto out; | |
793 | ||
4f70f7a9 | 794 | tp = task_thread_info(task); |
1da177e4 | 795 | bias = STACK_BIAS; |
f3169641 | 796 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
797 | |
798 | do { | |
4f70f7a9 | 799 | if (!kstack_valid(tp, fp)) |
1da177e4 LT |
800 | break; |
801 | rw = (struct reg_window *) fp; | |
802 | pc = rw->ins[7]; | |
803 | if (!in_sched_functions(pc)) { | |
804 | ret = pc; | |
805 | goto out; | |
806 | } | |
807 | fp = rw->ins[6] + bias; | |
808 | } while (++count < 16); | |
809 | ||
810 | out: | |
811 | return ret; | |
812 | } |