Commit | Line | Data |
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5526b7e4 | 1 | /* arch/sparc64/kernel/process.c |
1da177e4 | 2 | * |
93dae5b7 | 3 | * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
5 | * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | */ | |
7 | ||
8 | /* | |
9 | * This file handles the architecture-dependent parts of process handling.. | |
10 | */ | |
11 | ||
12 | #include <stdarg.h> | |
13 | ||
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
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> |
802c64b3 | 32 | #include <linux/nmi.h> |
1da177e4 | 33 | |
1da177e4 LT |
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> |
b1422401 | 48 | #include <asm/syscalls.h> |
93dae5b7 DM |
49 | #include <asm/irq_regs.h> |
50 | #include <asm/smp.h> | |
1da177e4 | 51 | |
4f70f7a9 DM |
52 | #include "kstack.h" |
53 | ||
e0204409 | 54 | static void sparc64_yield(int cpu) |
1da177e4 | 55 | { |
802c64b3 DM |
56 | if (tlb_type != hypervisor) { |
57 | touch_nmi_watchdog(); | |
30c91d57 | 58 | return; |
802c64b3 | 59 | } |
30c91d57 DM |
60 | |
61 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
62 | smp_mb__after_clear_bit(); | |
63 | ||
e0204409 | 64 | while (!need_resched() && !cpu_is_offline(cpu)) { |
30c91d57 DM |
65 | unsigned long pstate; |
66 | ||
67 | /* Disable interrupts. */ | |
68 | __asm__ __volatile__( | |
69 | "rdpr %%pstate, %0\n\t" | |
70 | "andn %0, %1, %0\n\t" | |
71 | "wrpr %0, %%g0, %%pstate" | |
72 | : "=&r" (pstate) | |
73 | : "i" (PSTATE_IE)); | |
74 | ||
e0204409 | 75 | if (!need_resched() && !cpu_is_offline(cpu)) |
30c91d57 DM |
76 | sun4v_cpu_yield(); |
77 | ||
78 | /* Re-enable interrupts. */ | |
79 | __asm__ __volatile__( | |
80 | "rdpr %%pstate, %0\n\t" | |
81 | "or %0, %1, %0\n\t" | |
82 | "wrpr %0, %%g0, %%pstate" | |
83 | : "=&r" (pstate) | |
84 | : "i" (PSTATE_IE)); | |
1da177e4 | 85 | } |
1da177e4 | 86 | |
30c91d57 DM |
87 | set_thread_flag(TIF_POLLING_NRFLAG); |
88 | } | |
1da177e4 | 89 | |
30c91d57 | 90 | /* The idle loop on sparc64. */ |
1da177e4 LT |
91 | void cpu_idle(void) |
92 | { | |
e0204409 DM |
93 | int cpu = smp_processor_id(); |
94 | ||
1da177e4 | 95 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 | 96 | |
1da177e4 | 97 | while(1) { |
b8f8c3cf | 98 | tick_nohz_stop_sched_tick(1); |
e0204409 DM |
99 | |
100 | while (!need_resched() && !cpu_is_offline(cpu)) | |
101 | sparc64_yield(cpu); | |
102 | ||
038cb01e DM |
103 | tick_nohz_restart_sched_tick(); |
104 | ||
105 | preempt_enable_no_resched(); | |
e0204409 DM |
106 | |
107 | #ifdef CONFIG_HOTPLUG_CPU | |
108 | if (cpu_is_offline(cpu)) | |
109 | cpu_play_dead(); | |
110 | #endif | |
111 | ||
038cb01e DM |
112 | schedule(); |
113 | preempt_disable(); | |
1da177e4 LT |
114 | } |
115 | } | |
116 | ||
959a85ad | 117 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
118 | static void show_regwindow32(struct pt_regs *regs) |
119 | { | |
120 | struct reg_window32 __user *rw; | |
121 | struct reg_window32 r_w; | |
122 | mm_segment_t old_fs; | |
123 | ||
124 | __asm__ __volatile__ ("flushw"); | |
125 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
126 | old_fs = get_fs(); | |
127 | set_fs (USER_DS); | |
128 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
129 | set_fs (old_fs); | |
130 | return; | |
131 | } | |
132 | ||
133 | set_fs (old_fs); | |
134 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
135 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
136 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
137 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
138 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
139 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
140 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
141 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
142 | } | |
959a85ad DM |
143 | #else |
144 | #define show_regwindow32(regs) do { } while (0) | |
145 | #endif | |
1da177e4 LT |
146 | |
147 | static void show_regwindow(struct pt_regs *regs) | |
148 | { | |
149 | struct reg_window __user *rw; | |
150 | struct reg_window *rwk; | |
151 | struct reg_window r_w; | |
152 | mm_segment_t old_fs; | |
153 | ||
154 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
155 | __asm__ __volatile__ ("flushw"); | |
156 | rw = (struct reg_window __user *) | |
157 | (regs->u_regs[14] + STACK_BIAS); | |
158 | rwk = (struct reg_window *) | |
159 | (regs->u_regs[14] + STACK_BIAS); | |
160 | if (!(regs->tstate & TSTATE_PRIV)) { | |
161 | old_fs = get_fs(); | |
162 | set_fs (USER_DS); | |
163 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
164 | set_fs (old_fs); | |
165 | return; | |
166 | } | |
167 | rwk = &r_w; | |
168 | set_fs (old_fs); | |
169 | } | |
170 | } else { | |
171 | show_regwindow32(regs); | |
172 | return; | |
173 | } | |
174 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
175 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
176 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
177 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
178 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
179 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
180 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
181 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
182 | if (regs->tstate & TSTATE_PRIV) | |
4fe3ebec | 183 | printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
1da177e4 LT |
184 | } |
185 | ||
dbf3e950 | 186 | void show_regs(struct pt_regs *regs) |
1da177e4 | 187 | { |
1da177e4 LT |
188 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
189 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
4fe3ebec | 190 | printk("TPC: <%pS>\n", (void *) regs->tpc); |
1da177e4 LT |
191 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
192 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
193 | regs->u_regs[3]); | |
194 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
195 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
196 | regs->u_regs[7]); | |
197 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
198 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
199 | regs->u_regs[11]); | |
200 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
201 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
202 | regs->u_regs[15]); | |
4fe3ebec | 203 | printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
1da177e4 | 204 | show_regwindow(regs); |
87e8f0e3 | 205 | show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); |
1da177e4 LT |
206 | } |
207 | ||
93dae5b7 DM |
208 | struct global_reg_snapshot global_reg_snapshot[NR_CPUS]; |
209 | static DEFINE_SPINLOCK(global_reg_snapshot_lock); | |
210 | ||
211 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, | |
212 | int this_cpu) | |
213 | { | |
214 | flushw_all(); | |
215 | ||
216 | global_reg_snapshot[this_cpu].tstate = regs->tstate; | |
217 | global_reg_snapshot[this_cpu].tpc = regs->tpc; | |
218 | global_reg_snapshot[this_cpu].tnpc = regs->tnpc; | |
219 | global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7]; | |
220 | ||
221 | if (regs->tstate & TSTATE_PRIV) { | |
222 | struct reg_window *rw; | |
223 | ||
224 | rw = (struct reg_window *) | |
225 | (regs->u_regs[UREG_FP] + STACK_BIAS); | |
4f70f7a9 | 226 | if (kstack_valid(tp, (unsigned long) rw)) { |
5afe2738 DM |
227 | global_reg_snapshot[this_cpu].i7 = rw->ins[7]; |
228 | rw = (struct reg_window *) | |
229 | (rw->ins[6] + STACK_BIAS); | |
4f70f7a9 | 230 | if (kstack_valid(tp, (unsigned long) rw)) |
5afe2738 DM |
231 | global_reg_snapshot[this_cpu].rpc = rw->ins[7]; |
232 | } | |
233 | } else { | |
93dae5b7 | 234 | global_reg_snapshot[this_cpu].i7 = 0; |
5afe2738 DM |
235 | global_reg_snapshot[this_cpu].rpc = 0; |
236 | } | |
93dae5b7 DM |
237 | global_reg_snapshot[this_cpu].thread = tp; |
238 | } | |
239 | ||
240 | /* In order to avoid hangs we do not try to synchronize with the | |
241 | * global register dump client cpus. The last store they make is to | |
242 | * the thread pointer, so do a short poll waiting for that to become | |
243 | * non-NULL. | |
244 | */ | |
245 | static void __global_reg_poll(struct global_reg_snapshot *gp) | |
246 | { | |
247 | int limit = 0; | |
248 | ||
249 | while (!gp->thread && ++limit < 100) { | |
250 | barrier(); | |
251 | udelay(1); | |
252 | } | |
253 | } | |
254 | ||
47cab6a7 | 255 | void arch_trigger_all_cpu_backtrace(void) |
93dae5b7 DM |
256 | { |
257 | struct thread_info *tp = current_thread_info(); | |
258 | struct pt_regs *regs = get_irq_regs(); | |
93dae5b7 DM |
259 | unsigned long flags; |
260 | int this_cpu, cpu; | |
261 | ||
262 | if (!regs) | |
263 | regs = tp->kregs; | |
264 | ||
265 | spin_lock_irqsave(&global_reg_snapshot_lock, flags); | |
266 | ||
267 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); | |
268 | ||
269 | this_cpu = raw_smp_processor_id(); | |
270 | ||
271 | __global_reg_self(tp, regs, this_cpu); | |
272 | ||
273 | smp_fetch_global_regs(); | |
274 | ||
275 | for_each_online_cpu(cpu) { | |
276 | struct global_reg_snapshot *gp = &global_reg_snapshot[cpu]; | |
93dae5b7 DM |
277 | |
278 | __global_reg_poll(gp); | |
279 | ||
280 | tp = gp->thread; | |
281 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", | |
282 | (cpu == this_cpu ? '*' : ' '), cpu, | |
283 | gp->tstate, gp->tpc, gp->tnpc, | |
284 | ((tp && tp->task) ? tp->task->comm : "NULL"), | |
285 | ((tp && tp->task) ? tp->task->pid : -1)); | |
4fe3ebec | 286 | |
93dae5b7 | 287 | if (gp->tstate & TSTATE_PRIV) { |
5afe2738 | 288 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
4fe3ebec DM |
289 | (void *) gp->tpc, |
290 | (void *) gp->o7, | |
5afe2738 DM |
291 | (void *) gp->i7, |
292 | (void *) gp->rpc); | |
4fe3ebec | 293 | } else { |
5afe2738 DM |
294 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
295 | gp->tpc, gp->o7, gp->i7, gp->rpc); | |
93dae5b7 DM |
296 | } |
297 | } | |
298 | ||
299 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); | |
300 | ||
301 | spin_unlock_irqrestore(&global_reg_snapshot_lock, flags); | |
302 | } | |
303 | ||
09ee167c DM |
304 | #ifdef CONFIG_MAGIC_SYSRQ |
305 | ||
306 | static void sysrq_handle_globreg(int key, struct tty_struct *tty) | |
307 | { | |
47cab6a7 | 308 | arch_trigger_all_cpu_backtrace(); |
09ee167c DM |
309 | } |
310 | ||
93dae5b7 DM |
311 | static struct sysrq_key_op sparc_globalreg_op = { |
312 | .handler = sysrq_handle_globreg, | |
313 | .help_msg = "Globalregs", | |
314 | .action_msg = "Show Global CPU Regs", | |
315 | }; | |
316 | ||
317 | static int __init sparc_globreg_init(void) | |
318 | { | |
319 | return register_sysrq_key('y', &sparc_globalreg_op); | |
320 | } | |
321 | ||
322 | core_initcall(sparc_globreg_init); | |
323 | ||
324 | #endif | |
325 | ||
1da177e4 LT |
326 | unsigned long thread_saved_pc(struct task_struct *tsk) |
327 | { | |
f3169641 | 328 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
329 | unsigned long ret = 0xdeadbeefUL; |
330 | ||
331 | if (ti && ti->ksp) { | |
332 | unsigned long *sp; | |
333 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
334 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
335 | sp[14]) { | |
336 | unsigned long *fp; | |
337 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
338 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
339 | ret = fp[15]; | |
340 | } | |
341 | } | |
342 | return ret; | |
343 | } | |
344 | ||
345 | /* Free current thread data structures etc.. */ | |
346 | void exit_thread(void) | |
347 | { | |
348 | struct thread_info *t = current_thread_info(); | |
349 | ||
350 | if (t->utraps) { | |
351 | if (t->utraps[0] < 2) | |
352 | kfree (t->utraps); | |
353 | else | |
354 | t->utraps[0]--; | |
355 | } | |
1da177e4 LT |
356 | } |
357 | ||
358 | void flush_thread(void) | |
359 | { | |
360 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 361 | struct mm_struct *mm; |
1da177e4 | 362 | |
74bf4312 DM |
363 | mm = t->task->mm; |
364 | if (mm) | |
98c5584c | 365 | tsb_context_switch(mm); |
1da177e4 | 366 | |
1da177e4 LT |
367 | set_thread_wsaved(0); |
368 | ||
1da177e4 LT |
369 | /* Clear FPU register state. */ |
370 | t->fpsaved[0] = 0; | |
371 | ||
372 | if (get_thread_current_ds() != ASI_AIUS) | |
373 | set_fs(USER_DS); | |
1da177e4 LT |
374 | } |
375 | ||
376 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
377 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
378 | { | |
379 | unsigned long fp, distance, rval; | |
380 | ||
381 | if (!(test_thread_flag(TIF_32BIT))) { | |
382 | csp += STACK_BIAS; | |
383 | psp += STACK_BIAS; | |
384 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
385 | fp += STACK_BIAS; | |
386 | } else | |
387 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
388 | ||
f036d9f3 DM |
389 | /* Now align the stack as this is mandatory in the Sparc ABI |
390 | * due to how register windows work. This hides the | |
391 | * restriction from thread libraries etc. | |
1da177e4 | 392 | */ |
f036d9f3 | 393 | csp &= ~15UL; |
1da177e4 LT |
394 | |
395 | distance = fp - psp; | |
396 | rval = (csp - distance); | |
397 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
398 | rval = 0; | |
399 | else if (test_thread_flag(TIF_32BIT)) { | |
400 | if (put_user(((u32)csp), | |
401 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
402 | rval = 0; | |
403 | } else { | |
404 | if (put_user(((u64)csp - STACK_BIAS), | |
405 | &(((struct reg_window __user *)rval)->ins[6]))) | |
406 | rval = 0; | |
407 | else | |
408 | rval = rval - STACK_BIAS; | |
409 | } | |
410 | ||
411 | return rval; | |
412 | } | |
413 | ||
414 | /* Standard stuff. */ | |
415 | static inline void shift_window_buffer(int first_win, int last_win, | |
416 | struct thread_info *t) | |
417 | { | |
418 | int i; | |
419 | ||
420 | for (i = first_win; i < last_win; i++) { | |
421 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
422 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
423 | sizeof(struct reg_window)); | |
424 | } | |
425 | } | |
426 | ||
427 | void synchronize_user_stack(void) | |
428 | { | |
429 | struct thread_info *t = current_thread_info(); | |
430 | unsigned long window; | |
431 | ||
432 | flush_user_windows(); | |
433 | if ((window = get_thread_wsaved()) != 0) { | |
434 | int winsize = sizeof(struct reg_window); | |
435 | int bias = 0; | |
436 | ||
437 | if (test_thread_flag(TIF_32BIT)) | |
438 | winsize = sizeof(struct reg_window32); | |
439 | else | |
440 | bias = STACK_BIAS; | |
441 | ||
442 | window -= 1; | |
443 | do { | |
444 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
445 | struct reg_window *rwin = &t->reg_window[window]; | |
446 | ||
447 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
448 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
449 | set_thread_wsaved(get_thread_wsaved() - 1); | |
450 | } | |
451 | } while (window--); | |
452 | } | |
453 | } | |
454 | ||
314ef685 DM |
455 | static void stack_unaligned(unsigned long sp) |
456 | { | |
457 | siginfo_t info; | |
458 | ||
459 | info.si_signo = SIGBUS; | |
460 | info.si_errno = 0; | |
461 | info.si_code = BUS_ADRALN; | |
462 | info.si_addr = (void __user *) sp; | |
463 | info.si_trapno = 0; | |
464 | force_sig_info(SIGBUS, &info, current); | |
465 | } | |
466 | ||
1da177e4 LT |
467 | void fault_in_user_windows(void) |
468 | { | |
469 | struct thread_info *t = current_thread_info(); | |
470 | unsigned long window; | |
471 | int winsize = sizeof(struct reg_window); | |
472 | int bias = 0; | |
473 | ||
474 | if (test_thread_flag(TIF_32BIT)) | |
475 | winsize = sizeof(struct reg_window32); | |
476 | else | |
477 | bias = STACK_BIAS; | |
478 | ||
479 | flush_user_windows(); | |
480 | window = get_thread_wsaved(); | |
481 | ||
314ef685 | 482 | if (likely(window != 0)) { |
1da177e4 LT |
483 | window -= 1; |
484 | do { | |
485 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
486 | struct reg_window *rwin = &t->reg_window[window]; | |
487 | ||
314ef685 DM |
488 | if (unlikely(sp & 0x7UL)) |
489 | stack_unaligned(sp); | |
490 | ||
491 | if (unlikely(copy_to_user((char __user *)sp, | |
492 | rwin, winsize))) | |
1da177e4 LT |
493 | goto barf; |
494 | } while (window--); | |
495 | } | |
496 | set_thread_wsaved(0); | |
497 | return; | |
498 | ||
499 | barf: | |
500 | set_thread_wsaved(window + 1); | |
501 | do_exit(SIGILL); | |
502 | } | |
503 | ||
504 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
505 | unsigned long stack_start, | |
506 | struct pt_regs *regs, | |
507 | unsigned long stack_size) | |
508 | { | |
509 | int __user *parent_tid_ptr, *child_tid_ptr; | |
1e38c126 DM |
510 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
511 | long ret; | |
1da177e4 LT |
512 | |
513 | #ifdef CONFIG_COMPAT | |
514 | if (test_thread_flag(TIF_32BIT)) { | |
515 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
516 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
517 | } else | |
518 | #endif | |
519 | { | |
520 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
521 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
522 | } | |
523 | ||
1e38c126 DM |
524 | ret = do_fork(clone_flags, stack_start, |
525 | regs, stack_size, | |
526 | parent_tid_ptr, child_tid_ptr); | |
527 | ||
528 | /* If we get an error and potentially restart the system | |
529 | * call, we're screwed because copy_thread() clobbered | |
530 | * the parent's %o1. So detect that case and restore it | |
531 | * here. | |
532 | */ | |
533 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
534 | regs->u_regs[UREG_I1] = orig_i1; | |
535 | ||
536 | return ret; | |
1da177e4 LT |
537 | } |
538 | ||
539 | /* Copy a Sparc thread. The fork() return value conventions | |
540 | * under SunOS are nothing short of bletcherous: | |
541 | * Parent --> %o0 == childs pid, %o1 == 0 | |
542 | * Child --> %o0 == parents pid, %o1 == 1 | |
543 | */ | |
6f2c55b8 | 544 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
1da177e4 LT |
545 | unsigned long unused, |
546 | struct task_struct *p, struct pt_regs *regs) | |
547 | { | |
ee3eea16 | 548 | struct thread_info *t = task_thread_info(p); |
a051bc5b DM |
549 | struct sparc_stackf *parent_sf; |
550 | unsigned long child_stack_sz; | |
1da177e4 | 551 | char *child_trap_frame; |
a051bc5b | 552 | int kernel_thread; |
1da177e4 | 553 | |
a051bc5b DM |
554 | kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0; |
555 | parent_sf = ((struct sparc_stackf *) regs) - 1; | |
1da177e4 | 556 | |
a051bc5b DM |
557 | /* Calculate offset to stack_frame & pt_regs */ |
558 | child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) + | |
559 | (kernel_thread ? STACKFRAME_SZ : 0)); | |
560 | child_trap_frame = (task_stack_page(p) + | |
561 | (THREAD_SIZE - child_stack_sz)); | |
562 | memcpy(child_trap_frame, parent_sf, child_stack_sz); | |
563 | ||
564 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | | |
565 | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 566 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 567 | t->new_child = 1; |
1da177e4 | 568 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
a051bc5b DM |
569 | t->kregs = (struct pt_regs *) (child_trap_frame + |
570 | sizeof(struct sparc_stackf)); | |
1da177e4 LT |
571 | t->fpsaved[0] = 0; |
572 | ||
a051bc5b DM |
573 | if (kernel_thread) { |
574 | struct sparc_stackf *child_sf = (struct sparc_stackf *) | |
575 | (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ)); | |
576 | ||
577 | /* Zero terminate the stack backtrace. */ | |
578 | child_sf->fp = NULL; | |
579 | t->kregs->u_regs[UREG_FP] = | |
580 | ((unsigned long) child_sf) - STACK_BIAS; | |
581 | ||
1da177e4 | 582 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); |
1da177e4 LT |
583 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; |
584 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
585 | } else { | |
586 | if (t->flags & _TIF_32BIT) { | |
587 | sp &= 0x00000000ffffffffUL; | |
588 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
589 | } | |
590 | t->kregs->u_regs[UREG_FP] = sp; | |
591 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
592 | if (sp != regs->u_regs[UREG_FP]) { | |
593 | unsigned long csp; | |
594 | ||
595 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
596 | if (!csp) | |
597 | return -EFAULT; | |
598 | t->kregs->u_regs[UREG_FP] = csp; | |
599 | } | |
600 | if (t->utraps) | |
601 | t->utraps[0]++; | |
602 | } | |
603 | ||
604 | /* Set the return value for the child. */ | |
605 | t->kregs->u_regs[UREG_I0] = current->pid; | |
606 | t->kregs->u_regs[UREG_I1] = 1; | |
607 | ||
608 | /* Set the second return value for the parent. */ | |
609 | regs->u_regs[UREG_I1] = 0; | |
610 | ||
611 | if (clone_flags & CLONE_SETTLS) | |
612 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | /* | |
618 | * This is the mechanism for creating a new kernel thread. | |
619 | * | |
620 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
621 | * who haven't done an "execve()") should use this: it will work within | |
622 | * a system call from a "real" process, but the process memory space will | |
e5dd42e4 | 623 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
624 | */ |
625 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
626 | { | |
627 | long retval; | |
628 | ||
629 | /* If the parent runs before fn(arg) is called by the child, | |
630 | * the input registers of this function can be clobbered. | |
631 | * So we stash 'fn' and 'arg' into global registers which | |
632 | * will not be modified by the parent. | |
633 | */ | |
634 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
635 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
636 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
637 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
638 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
639 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
640 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
641 | " mov %%o0, %0\n\t" | |
642 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
643 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
644 | "mov %3, %%g1\n\t" | |
645 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
646 | /* Notreached by child. */ | |
647 | "1:" : | |
648 | "=r" (retval) : | |
649 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
650 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
651 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
652 | return retval; | |
653 | } | |
917c3660 | 654 | EXPORT_SYMBOL(kernel_thread); |
1da177e4 | 655 | |
1da177e4 LT |
656 | typedef struct { |
657 | union { | |
658 | unsigned int pr_regs[32]; | |
659 | unsigned long pr_dregs[16]; | |
660 | } pr_fr; | |
661 | unsigned int __unused; | |
662 | unsigned int pr_fsr; | |
663 | unsigned char pr_qcnt; | |
664 | unsigned char pr_q_entrysize; | |
665 | unsigned char pr_en; | |
666 | unsigned int pr_q[64]; | |
667 | } elf_fpregset_t32; | |
668 | ||
669 | /* | |
670 | * fill in the fpu structure for a core dump. | |
671 | */ | |
672 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
673 | { | |
674 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
675 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
676 | ||
677 | if (test_thread_flag(TIF_32BIT)) { | |
678 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
679 | ||
680 | if (fprs & FPRS_DL) | |
681 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
682 | sizeof(unsigned int) * 32); | |
683 | else | |
684 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
685 | sizeof(unsigned int) * 32); | |
686 | fpregs32->pr_qcnt = 0; | |
687 | fpregs32->pr_q_entrysize = 8; | |
688 | memset(&fpregs32->pr_q[0], 0, | |
689 | (sizeof(unsigned int) * 64)); | |
690 | if (fprs & FPRS_FEF) { | |
691 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
692 | fpregs32->pr_en = 1; | |
693 | } else { | |
694 | fpregs32->pr_fsr = 0; | |
695 | fpregs32->pr_en = 0; | |
696 | } | |
697 | } else { | |
698 | if(fprs & FPRS_DL) | |
699 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
700 | sizeof(unsigned int) * 32); | |
701 | else | |
702 | memset(&fpregs->pr_regs[0], 0, | |
703 | sizeof(unsigned int) * 32); | |
704 | if(fprs & FPRS_DU) | |
705 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
706 | sizeof(unsigned int) * 32); | |
707 | else | |
708 | memset(&fpregs->pr_regs[16], 0, | |
709 | sizeof(unsigned int) * 32); | |
710 | if(fprs & FPRS_FEF) { | |
711 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
712 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
713 | } else { | |
714 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
715 | } | |
716 | fpregs->pr_fprs = fprs; | |
717 | } | |
718 | return 1; | |
719 | } | |
917c3660 | 720 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 LT |
721 | |
722 | /* | |
723 | * sparc_execve() executes a new program after the asm stub has set | |
724 | * things up for us. This should basically do what I want it to. | |
725 | */ | |
726 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
727 | { | |
728 | int error, base = 0; | |
729 | char *filename; | |
730 | ||
731 | /* User register window flush is done by entry.S */ | |
732 | ||
733 | /* Check for indirect call. */ | |
734 | if (regs->u_regs[UREG_G1] == 0) | |
735 | base = 1; | |
736 | ||
737 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
738 | error = PTR_ERR(filename); | |
739 | if (IS_ERR(filename)) | |
740 | goto out; | |
741 | error = do_execve(filename, | |
742 | (char __user * __user *) | |
743 | regs->u_regs[base + UREG_I1], | |
744 | (char __user * __user *) | |
745 | regs->u_regs[base + UREG_I2], regs); | |
746 | putname(filename); | |
747 | if (!error) { | |
748 | fprs_write(0); | |
749 | current_thread_info()->xfsr[0] = 0; | |
750 | current_thread_info()->fpsaved[0] = 0; | |
751 | regs->tstate &= ~TSTATE_PEF; | |
1da177e4 LT |
752 | } |
753 | out: | |
754 | return error; | |
755 | } | |
756 | ||
757 | unsigned long get_wchan(struct task_struct *task) | |
758 | { | |
759 | unsigned long pc, fp, bias = 0; | |
4f70f7a9 | 760 | struct thread_info *tp; |
1da177e4 LT |
761 | struct reg_window *rw; |
762 | unsigned long ret = 0; | |
763 | int count = 0; | |
764 | ||
765 | if (!task || task == current || | |
766 | task->state == TASK_RUNNING) | |
767 | goto out; | |
768 | ||
4f70f7a9 | 769 | tp = task_thread_info(task); |
1da177e4 | 770 | bias = STACK_BIAS; |
f3169641 | 771 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
772 | |
773 | do { | |
4f70f7a9 | 774 | if (!kstack_valid(tp, fp)) |
1da177e4 LT |
775 | break; |
776 | rw = (struct reg_window *) fp; | |
777 | pc = rw->ins[7]; | |
778 | if (!in_sched_functions(pc)) { | |
779 | ret = pc; | |
780 | goto out; | |
781 | } | |
782 | fp = rw->ins[6] + bias; | |
783 | } while (++count < 16); | |
784 | ||
785 | out: | |
786 | return ret; | |
787 | } |