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 | 14 | #include <linux/errno.h> |
066bcaca | 15 | #include <linux/export.h> |
1da177e4 LT |
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 | 34 | #include <asm/uaccess.h> |
1da177e4 LT |
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 | { |
802c64b3 DM |
55 | if (tlb_type != hypervisor) { |
56 | touch_nmi_watchdog(); | |
30c91d57 | 57 | return; |
802c64b3 | 58 | } |
30c91d57 DM |
59 | |
60 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
61 | smp_mb__after_clear_bit(); | |
62 | ||
e0204409 | 63 | while (!need_resched() && !cpu_is_offline(cpu)) { |
30c91d57 DM |
64 | unsigned long pstate; |
65 | ||
66 | /* Disable interrupts. */ | |
67 | __asm__ __volatile__( | |
68 | "rdpr %%pstate, %0\n\t" | |
69 | "andn %0, %1, %0\n\t" | |
70 | "wrpr %0, %%g0, %%pstate" | |
71 | : "=&r" (pstate) | |
72 | : "i" (PSTATE_IE)); | |
73 | ||
e0204409 | 74 | if (!need_resched() && !cpu_is_offline(cpu)) |
30c91d57 DM |
75 | sun4v_cpu_yield(); |
76 | ||
77 | /* Re-enable interrupts. */ | |
78 | __asm__ __volatile__( | |
79 | "rdpr %%pstate, %0\n\t" | |
80 | "or %0, %1, %0\n\t" | |
81 | "wrpr %0, %%g0, %%pstate" | |
82 | : "=&r" (pstate) | |
83 | : "i" (PSTATE_IE)); | |
1da177e4 | 84 | } |
1da177e4 | 85 | |
30c91d57 DM |
86 | set_thread_flag(TIF_POLLING_NRFLAG); |
87 | } | |
1da177e4 | 88 | |
30c91d57 | 89 | /* The idle loop on sparc64. */ |
1da177e4 LT |
90 | void cpu_idle(void) |
91 | { | |
e0204409 DM |
92 | int cpu = smp_processor_id(); |
93 | ||
1da177e4 | 94 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 | 95 | |
1da177e4 | 96 | while(1) { |
1268fbc7 FW |
97 | tick_nohz_idle_enter(); |
98 | rcu_idle_enter(); | |
e0204409 DM |
99 | |
100 | while (!need_resched() && !cpu_is_offline(cpu)) | |
101 | sparc64_yield(cpu); | |
102 | ||
1268fbc7 FW |
103 | rcu_idle_exit(); |
104 | tick_nohz_idle_exit(); | |
038cb01e | 105 | |
e0204409 | 106 | #ifdef CONFIG_HOTPLUG_CPU |
bd2f5536 | 107 | if (cpu_is_offline(cpu)) { |
ba74c144 | 108 | sched_preempt_enable_no_resched(); |
e0204409 | 109 | cpu_play_dead(); |
bd2f5536 | 110 | } |
e0204409 | 111 | #endif |
bd2f5536 | 112 | schedule_preempt_disabled(); |
1da177e4 LT |
113 | } |
114 | } | |
115 | ||
959a85ad | 116 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
117 | static void show_regwindow32(struct pt_regs *regs) |
118 | { | |
119 | struct reg_window32 __user *rw; | |
120 | struct reg_window32 r_w; | |
121 | mm_segment_t old_fs; | |
122 | ||
123 | __asm__ __volatile__ ("flushw"); | |
124 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
125 | old_fs = get_fs(); | |
126 | set_fs (USER_DS); | |
127 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
128 | set_fs (old_fs); | |
129 | return; | |
130 | } | |
131 | ||
132 | set_fs (old_fs); | |
133 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
134 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
135 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
136 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
137 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
138 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
139 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
140 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
141 | } | |
959a85ad DM |
142 | #else |
143 | #define show_regwindow32(regs) do { } while (0) | |
144 | #endif | |
1da177e4 LT |
145 | |
146 | static void show_regwindow(struct pt_regs *regs) | |
147 | { | |
148 | struct reg_window __user *rw; | |
149 | struct reg_window *rwk; | |
150 | struct reg_window r_w; | |
151 | mm_segment_t old_fs; | |
152 | ||
153 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
154 | __asm__ __volatile__ ("flushw"); | |
155 | rw = (struct reg_window __user *) | |
156 | (regs->u_regs[14] + STACK_BIAS); | |
157 | rwk = (struct reg_window *) | |
158 | (regs->u_regs[14] + STACK_BIAS); | |
159 | if (!(regs->tstate & TSTATE_PRIV)) { | |
160 | old_fs = get_fs(); | |
161 | set_fs (USER_DS); | |
162 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
163 | set_fs (old_fs); | |
164 | return; | |
165 | } | |
166 | rwk = &r_w; | |
167 | set_fs (old_fs); | |
168 | } | |
169 | } else { | |
170 | show_regwindow32(regs); | |
171 | return; | |
172 | } | |
173 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
174 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
175 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
176 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
177 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
178 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
179 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
180 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
181 | if (regs->tstate & TSTATE_PRIV) | |
4fe3ebec | 182 | printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
1da177e4 LT |
183 | } |
184 | ||
dbf3e950 | 185 | void show_regs(struct pt_regs *regs) |
1da177e4 | 186 | { |
1da177e4 LT |
187 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
188 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
4fe3ebec | 189 | printk("TPC: <%pS>\n", (void *) regs->tpc); |
1da177e4 LT |
190 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
191 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
192 | regs->u_regs[3]); | |
193 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
194 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
195 | regs->u_regs[7]); | |
196 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
197 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
198 | regs->u_regs[11]); | |
199 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
200 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
201 | regs->u_regs[15]); | |
4fe3ebec | 202 | printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
1da177e4 | 203 | show_regwindow(regs); |
87e8f0e3 | 204 | show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); |
1da177e4 LT |
205 | } |
206 | ||
93dae5b7 DM |
207 | struct global_reg_snapshot global_reg_snapshot[NR_CPUS]; |
208 | static DEFINE_SPINLOCK(global_reg_snapshot_lock); | |
209 | ||
210 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, | |
211 | int this_cpu) | |
212 | { | |
213 | flushw_all(); | |
214 | ||
215 | global_reg_snapshot[this_cpu].tstate = regs->tstate; | |
216 | global_reg_snapshot[this_cpu].tpc = regs->tpc; | |
217 | global_reg_snapshot[this_cpu].tnpc = regs->tnpc; | |
218 | global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7]; | |
219 | ||
220 | if (regs->tstate & TSTATE_PRIV) { | |
221 | struct reg_window *rw; | |
222 | ||
223 | rw = (struct reg_window *) | |
224 | (regs->u_regs[UREG_FP] + STACK_BIAS); | |
4f70f7a9 | 225 | if (kstack_valid(tp, (unsigned long) rw)) { |
5afe2738 DM |
226 | global_reg_snapshot[this_cpu].i7 = rw->ins[7]; |
227 | rw = (struct reg_window *) | |
228 | (rw->ins[6] + STACK_BIAS); | |
4f70f7a9 | 229 | if (kstack_valid(tp, (unsigned long) rw)) |
5afe2738 DM |
230 | global_reg_snapshot[this_cpu].rpc = rw->ins[7]; |
231 | } | |
232 | } else { | |
93dae5b7 | 233 | global_reg_snapshot[this_cpu].i7 = 0; |
5afe2738 DM |
234 | global_reg_snapshot[this_cpu].rpc = 0; |
235 | } | |
93dae5b7 DM |
236 | global_reg_snapshot[this_cpu].thread = tp; |
237 | } | |
238 | ||
239 | /* In order to avoid hangs we do not try to synchronize with the | |
240 | * global register dump client cpus. The last store they make is to | |
241 | * the thread pointer, so do a short poll waiting for that to become | |
242 | * non-NULL. | |
243 | */ | |
244 | static void __global_reg_poll(struct global_reg_snapshot *gp) | |
245 | { | |
246 | int limit = 0; | |
247 | ||
248 | while (!gp->thread && ++limit < 100) { | |
249 | barrier(); | |
250 | udelay(1); | |
251 | } | |
252 | } | |
253 | ||
47cab6a7 | 254 | void arch_trigger_all_cpu_backtrace(void) |
93dae5b7 DM |
255 | { |
256 | struct thread_info *tp = current_thread_info(); | |
257 | struct pt_regs *regs = get_irq_regs(); | |
93dae5b7 DM |
258 | unsigned long flags; |
259 | int this_cpu, cpu; | |
260 | ||
261 | if (!regs) | |
262 | regs = tp->kregs; | |
263 | ||
264 | spin_lock_irqsave(&global_reg_snapshot_lock, flags); | |
265 | ||
266 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); | |
267 | ||
268 | this_cpu = raw_smp_processor_id(); | |
269 | ||
270 | __global_reg_self(tp, regs, this_cpu); | |
271 | ||
272 | smp_fetch_global_regs(); | |
273 | ||
274 | for_each_online_cpu(cpu) { | |
275 | struct global_reg_snapshot *gp = &global_reg_snapshot[cpu]; | |
93dae5b7 DM |
276 | |
277 | __global_reg_poll(gp); | |
278 | ||
279 | tp = gp->thread; | |
280 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", | |
281 | (cpu == this_cpu ? '*' : ' '), cpu, | |
282 | gp->tstate, gp->tpc, gp->tnpc, | |
283 | ((tp && tp->task) ? tp->task->comm : "NULL"), | |
284 | ((tp && tp->task) ? tp->task->pid : -1)); | |
4fe3ebec | 285 | |
93dae5b7 | 286 | if (gp->tstate & TSTATE_PRIV) { |
5afe2738 | 287 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
4fe3ebec DM |
288 | (void *) gp->tpc, |
289 | (void *) gp->o7, | |
5afe2738 DM |
290 | (void *) gp->i7, |
291 | (void *) gp->rpc); | |
4fe3ebec | 292 | } else { |
5afe2738 DM |
293 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
294 | gp->tpc, gp->o7, gp->i7, gp->rpc); | |
93dae5b7 DM |
295 | } |
296 | } | |
297 | ||
298 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); | |
299 | ||
300 | spin_unlock_irqrestore(&global_reg_snapshot_lock, flags); | |
301 | } | |
302 | ||
09ee167c DM |
303 | #ifdef CONFIG_MAGIC_SYSRQ |
304 | ||
1495cc9d | 305 | static void sysrq_handle_globreg(int key) |
09ee167c | 306 | { |
47cab6a7 | 307 | arch_trigger_all_cpu_backtrace(); |
09ee167c DM |
308 | } |
309 | ||
93dae5b7 DM |
310 | static struct sysrq_key_op sparc_globalreg_op = { |
311 | .handler = sysrq_handle_globreg, | |
312 | .help_msg = "Globalregs", | |
313 | .action_msg = "Show Global CPU Regs", | |
314 | }; | |
315 | ||
316 | static int __init sparc_globreg_init(void) | |
317 | { | |
318 | return register_sysrq_key('y', &sparc_globalreg_op); | |
319 | } | |
320 | ||
321 | core_initcall(sparc_globreg_init); | |
322 | ||
323 | #endif | |
324 | ||
1da177e4 LT |
325 | unsigned long thread_saved_pc(struct task_struct *tsk) |
326 | { | |
f3169641 | 327 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
328 | unsigned long ret = 0xdeadbeefUL; |
329 | ||
330 | if (ti && ti->ksp) { | |
331 | unsigned long *sp; | |
332 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
333 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
334 | sp[14]) { | |
335 | unsigned long *fp; | |
336 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
337 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
338 | ret = fp[15]; | |
339 | } | |
340 | } | |
341 | return ret; | |
342 | } | |
343 | ||
344 | /* Free current thread data structures etc.. */ | |
345 | void exit_thread(void) | |
346 | { | |
347 | struct thread_info *t = current_thread_info(); | |
348 | ||
349 | if (t->utraps) { | |
350 | if (t->utraps[0] < 2) | |
351 | kfree (t->utraps); | |
352 | else | |
353 | t->utraps[0]--; | |
354 | } | |
1da177e4 LT |
355 | } |
356 | ||
357 | void flush_thread(void) | |
358 | { | |
359 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 360 | struct mm_struct *mm; |
1da177e4 | 361 | |
74bf4312 DM |
362 | mm = t->task->mm; |
363 | if (mm) | |
98c5584c | 364 | tsb_context_switch(mm); |
1da177e4 | 365 | |
1da177e4 LT |
366 | set_thread_wsaved(0); |
367 | ||
1da177e4 LT |
368 | /* Clear FPU register state. */ |
369 | t->fpsaved[0] = 0; | |
1da177e4 LT |
370 | } |
371 | ||
372 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
373 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
374 | { | |
375 | unsigned long fp, distance, rval; | |
376 | ||
377 | if (!(test_thread_flag(TIF_32BIT))) { | |
378 | csp += STACK_BIAS; | |
379 | psp += STACK_BIAS; | |
380 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
381 | fp += STACK_BIAS; | |
382 | } else | |
383 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
384 | ||
f036d9f3 DM |
385 | /* Now align the stack as this is mandatory in the Sparc ABI |
386 | * due to how register windows work. This hides the | |
387 | * restriction from thread libraries etc. | |
1da177e4 | 388 | */ |
f036d9f3 | 389 | csp &= ~15UL; |
1da177e4 LT |
390 | |
391 | distance = fp - psp; | |
392 | rval = (csp - distance); | |
393 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
394 | rval = 0; | |
395 | else if (test_thread_flag(TIF_32BIT)) { | |
396 | if (put_user(((u32)csp), | |
397 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
398 | rval = 0; | |
399 | } else { | |
400 | if (put_user(((u64)csp - STACK_BIAS), | |
401 | &(((struct reg_window __user *)rval)->ins[6]))) | |
402 | rval = 0; | |
403 | else | |
404 | rval = rval - STACK_BIAS; | |
405 | } | |
406 | ||
407 | return rval; | |
408 | } | |
409 | ||
410 | /* Standard stuff. */ | |
411 | static inline void shift_window_buffer(int first_win, int last_win, | |
412 | struct thread_info *t) | |
413 | { | |
414 | int i; | |
415 | ||
416 | for (i = first_win; i < last_win; i++) { | |
417 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
418 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
419 | sizeof(struct reg_window)); | |
420 | } | |
421 | } | |
422 | ||
423 | void synchronize_user_stack(void) | |
424 | { | |
425 | struct thread_info *t = current_thread_info(); | |
426 | unsigned long window; | |
427 | ||
428 | flush_user_windows(); | |
429 | if ((window = get_thread_wsaved()) != 0) { | |
430 | int winsize = sizeof(struct reg_window); | |
431 | int bias = 0; | |
432 | ||
433 | if (test_thread_flag(TIF_32BIT)) | |
434 | winsize = sizeof(struct reg_window32); | |
435 | else | |
436 | bias = STACK_BIAS; | |
437 | ||
438 | window -= 1; | |
439 | do { | |
440 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
441 | struct reg_window *rwin = &t->reg_window[window]; | |
442 | ||
443 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
444 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
445 | set_thread_wsaved(get_thread_wsaved() - 1); | |
446 | } | |
447 | } while (window--); | |
448 | } | |
449 | } | |
450 | ||
314ef685 DM |
451 | static void stack_unaligned(unsigned long sp) |
452 | { | |
453 | siginfo_t info; | |
454 | ||
455 | info.si_signo = SIGBUS; | |
456 | info.si_errno = 0; | |
457 | info.si_code = BUS_ADRALN; | |
458 | info.si_addr = (void __user *) sp; | |
459 | info.si_trapno = 0; | |
460 | force_sig_info(SIGBUS, &info, current); | |
461 | } | |
462 | ||
1da177e4 LT |
463 | void fault_in_user_windows(void) |
464 | { | |
465 | struct thread_info *t = current_thread_info(); | |
466 | unsigned long window; | |
467 | int winsize = sizeof(struct reg_window); | |
468 | int bias = 0; | |
469 | ||
470 | if (test_thread_flag(TIF_32BIT)) | |
471 | winsize = sizeof(struct reg_window32); | |
472 | else | |
473 | bias = STACK_BIAS; | |
474 | ||
475 | flush_user_windows(); | |
476 | window = get_thread_wsaved(); | |
477 | ||
314ef685 | 478 | if (likely(window != 0)) { |
1da177e4 LT |
479 | window -= 1; |
480 | do { | |
481 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
482 | struct reg_window *rwin = &t->reg_window[window]; | |
483 | ||
314ef685 DM |
484 | if (unlikely(sp & 0x7UL)) |
485 | stack_unaligned(sp); | |
486 | ||
487 | if (unlikely(copy_to_user((char __user *)sp, | |
488 | rwin, winsize))) | |
1da177e4 LT |
489 | goto barf; |
490 | } while (window--); | |
491 | } | |
492 | set_thread_wsaved(0); | |
493 | return; | |
494 | ||
495 | barf: | |
496 | set_thread_wsaved(window + 1); | |
497 | do_exit(SIGILL); | |
498 | } | |
499 | ||
500 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
501 | unsigned long stack_start, | |
502 | struct pt_regs *regs, | |
503 | unsigned long stack_size) | |
504 | { | |
505 | int __user *parent_tid_ptr, *child_tid_ptr; | |
1e38c126 DM |
506 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
507 | long ret; | |
1da177e4 LT |
508 | |
509 | #ifdef CONFIG_COMPAT | |
510 | if (test_thread_flag(TIF_32BIT)) { | |
511 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
512 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
513 | } else | |
514 | #endif | |
515 | { | |
516 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
517 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
518 | } | |
519 | ||
1e38c126 DM |
520 | ret = do_fork(clone_flags, stack_start, |
521 | regs, stack_size, | |
522 | parent_tid_ptr, child_tid_ptr); | |
523 | ||
524 | /* If we get an error and potentially restart the system | |
525 | * call, we're screwed because copy_thread() clobbered | |
526 | * the parent's %o1. So detect that case and restore it | |
527 | * here. | |
528 | */ | |
529 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
530 | regs->u_regs[UREG_I1] = orig_i1; | |
531 | ||
532 | return ret; | |
1da177e4 LT |
533 | } |
534 | ||
535 | /* Copy a Sparc thread. The fork() return value conventions | |
536 | * under SunOS are nothing short of bletcherous: | |
537 | * Parent --> %o0 == childs pid, %o1 == 0 | |
538 | * Child --> %o0 == parents pid, %o1 == 1 | |
539 | */ | |
6f2c55b8 | 540 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
1da177e4 LT |
541 | unsigned long unused, |
542 | struct task_struct *p, struct pt_regs *regs) | |
543 | { | |
ee3eea16 | 544 | struct thread_info *t = task_thread_info(p); |
a051bc5b DM |
545 | struct sparc_stackf *parent_sf; |
546 | unsigned long child_stack_sz; | |
1da177e4 | 547 | char *child_trap_frame; |
a051bc5b | 548 | int kernel_thread; |
1da177e4 | 549 | |
a051bc5b DM |
550 | kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0; |
551 | parent_sf = ((struct sparc_stackf *) regs) - 1; | |
1da177e4 | 552 | |
a051bc5b DM |
553 | /* Calculate offset to stack_frame & pt_regs */ |
554 | child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) + | |
555 | (kernel_thread ? STACKFRAME_SZ : 0)); | |
556 | child_trap_frame = (task_stack_page(p) + | |
557 | (THREAD_SIZE - child_stack_sz)); | |
558 | memcpy(child_trap_frame, parent_sf, child_stack_sz); | |
559 | ||
560 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | | |
561 | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 562 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 563 | t->new_child = 1; |
1da177e4 | 564 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
a051bc5b DM |
565 | t->kregs = (struct pt_regs *) (child_trap_frame + |
566 | sizeof(struct sparc_stackf)); | |
1da177e4 LT |
567 | t->fpsaved[0] = 0; |
568 | ||
a051bc5b DM |
569 | if (kernel_thread) { |
570 | struct sparc_stackf *child_sf = (struct sparc_stackf *) | |
571 | (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ)); | |
572 | ||
573 | /* Zero terminate the stack backtrace. */ | |
574 | child_sf->fp = NULL; | |
575 | t->kregs->u_regs[UREG_FP] = | |
576 | ((unsigned long) child_sf) - STACK_BIAS; | |
577 | ||
1da177e4 | 578 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); |
1da177e4 LT |
579 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; |
580 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
581 | } else { | |
582 | if (t->flags & _TIF_32BIT) { | |
583 | sp &= 0x00000000ffffffffUL; | |
584 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
585 | } | |
586 | t->kregs->u_regs[UREG_FP] = sp; | |
587 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
588 | if (sp != regs->u_regs[UREG_FP]) { | |
589 | unsigned long csp; | |
590 | ||
591 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
592 | if (!csp) | |
593 | return -EFAULT; | |
594 | t->kregs->u_regs[UREG_FP] = csp; | |
595 | } | |
596 | if (t->utraps) | |
597 | t->utraps[0]++; | |
598 | } | |
599 | ||
600 | /* Set the return value for the child. */ | |
601 | t->kregs->u_regs[UREG_I0] = current->pid; | |
602 | t->kregs->u_regs[UREG_I1] = 1; | |
603 | ||
604 | /* Set the second return value for the parent. */ | |
605 | regs->u_regs[UREG_I1] = 0; | |
606 | ||
607 | if (clone_flags & CLONE_SETTLS) | |
608 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | /* | |
614 | * This is the mechanism for creating a new kernel thread. | |
615 | * | |
616 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
617 | * who haven't done an "execve()") should use this: it will work within | |
618 | * a system call from a "real" process, but the process memory space will | |
e5dd42e4 | 619 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
620 | */ |
621 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
622 | { | |
623 | long retval; | |
624 | ||
625 | /* If the parent runs before fn(arg) is called by the child, | |
626 | * the input registers of this function can be clobbered. | |
627 | * So we stash 'fn' and 'arg' into global registers which | |
628 | * will not be modified by the parent. | |
629 | */ | |
630 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
631 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
632 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
633 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
634 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
635 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
636 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
637 | " mov %%o0, %0\n\t" | |
638 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
639 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
640 | "mov %3, %%g1\n\t" | |
641 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
642 | /* Notreached by child. */ | |
643 | "1:" : | |
644 | "=r" (retval) : | |
645 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
646 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
647 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
648 | return retval; | |
649 | } | |
917c3660 | 650 | EXPORT_SYMBOL(kernel_thread); |
1da177e4 | 651 | |
1da177e4 LT |
652 | typedef struct { |
653 | union { | |
654 | unsigned int pr_regs[32]; | |
655 | unsigned long pr_dregs[16]; | |
656 | } pr_fr; | |
657 | unsigned int __unused; | |
658 | unsigned int pr_fsr; | |
659 | unsigned char pr_qcnt; | |
660 | unsigned char pr_q_entrysize; | |
661 | unsigned char pr_en; | |
662 | unsigned int pr_q[64]; | |
663 | } elf_fpregset_t32; | |
664 | ||
665 | /* | |
666 | * fill in the fpu structure for a core dump. | |
667 | */ | |
668 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
669 | { | |
670 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
671 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
672 | ||
673 | if (test_thread_flag(TIF_32BIT)) { | |
674 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
675 | ||
676 | if (fprs & FPRS_DL) | |
677 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
678 | sizeof(unsigned int) * 32); | |
679 | else | |
680 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
681 | sizeof(unsigned int) * 32); | |
682 | fpregs32->pr_qcnt = 0; | |
683 | fpregs32->pr_q_entrysize = 8; | |
684 | memset(&fpregs32->pr_q[0], 0, | |
685 | (sizeof(unsigned int) * 64)); | |
686 | if (fprs & FPRS_FEF) { | |
687 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
688 | fpregs32->pr_en = 1; | |
689 | } else { | |
690 | fpregs32->pr_fsr = 0; | |
691 | fpregs32->pr_en = 0; | |
692 | } | |
693 | } else { | |
694 | if(fprs & FPRS_DL) | |
695 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
696 | sizeof(unsigned int) * 32); | |
697 | else | |
698 | memset(&fpregs->pr_regs[0], 0, | |
699 | sizeof(unsigned int) * 32); | |
700 | if(fprs & FPRS_DU) | |
701 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
702 | sizeof(unsigned int) * 32); | |
703 | else | |
704 | memset(&fpregs->pr_regs[16], 0, | |
705 | sizeof(unsigned int) * 32); | |
706 | if(fprs & FPRS_FEF) { | |
707 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
708 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
709 | } else { | |
710 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
711 | } | |
712 | fpregs->pr_fprs = fprs; | |
713 | } | |
714 | return 1; | |
715 | } | |
917c3660 | 716 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 LT |
717 | |
718 | /* | |
719 | * sparc_execve() executes a new program after the asm stub has set | |
720 | * things up for us. This should basically do what I want it to. | |
721 | */ | |
722 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
723 | { | |
724 | int error, base = 0; | |
725 | char *filename; | |
726 | ||
727 | /* User register window flush is done by entry.S */ | |
728 | ||
729 | /* Check for indirect call. */ | |
730 | if (regs->u_regs[UREG_G1] == 0) | |
731 | base = 1; | |
732 | ||
733 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
734 | error = PTR_ERR(filename); | |
735 | if (IS_ERR(filename)) | |
736 | goto out; | |
737 | error = do_execve(filename, | |
d7627467 | 738 | (const char __user *const __user *) |
1da177e4 | 739 | regs->u_regs[base + UREG_I1], |
d7627467 | 740 | (const char __user *const __user *) |
1da177e4 LT |
741 | regs->u_regs[base + UREG_I2], regs); |
742 | putname(filename); | |
743 | if (!error) { | |
744 | fprs_write(0); | |
745 | current_thread_info()->xfsr[0] = 0; | |
746 | current_thread_info()->fpsaved[0] = 0; | |
747 | regs->tstate &= ~TSTATE_PEF; | |
1da177e4 LT |
748 | } |
749 | out: | |
750 | return error; | |
751 | } | |
752 | ||
753 | unsigned long get_wchan(struct task_struct *task) | |
754 | { | |
755 | unsigned long pc, fp, bias = 0; | |
4f70f7a9 | 756 | struct thread_info *tp; |
1da177e4 LT |
757 | struct reg_window *rw; |
758 | unsigned long ret = 0; | |
759 | int count = 0; | |
760 | ||
761 | if (!task || task == current || | |
762 | task->state == TASK_RUNNING) | |
763 | goto out; | |
764 | ||
4f70f7a9 | 765 | tp = task_thread_info(task); |
1da177e4 | 766 | bias = STACK_BIAS; |
f3169641 | 767 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
768 | |
769 | do { | |
4f70f7a9 | 770 | if (!kstack_valid(tp, fp)) |
1da177e4 LT |
771 | break; |
772 | rw = (struct reg_window *) fp; | |
773 | pc = rw->ins[7]; | |
774 | if (!in_sched_functions(pc)) { | |
775 | ret = pc; | |
776 | goto out; | |
777 | } | |
778 | fp = rw->ins[6] + bias; | |
779 | } while (++count < 16); | |
780 | ||
781 | out: | |
782 | return ret; | |
783 | } |