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> |
916ca14a | 30 | #include <linux/perf_event.h> |
b1422401 | 31 | #include <linux/elfcore.h> |
93dae5b7 | 32 | #include <linux/sysrq.h> |
802c64b3 | 33 | #include <linux/nmi.h> |
812cb83a | 34 | #include <linux/context_tracking.h> |
1da177e4 | 35 | |
1da177e4 | 36 | #include <asm/uaccess.h> |
1da177e4 LT |
37 | #include <asm/page.h> |
38 | #include <asm/pgalloc.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/processor.h> | |
41 | #include <asm/pstate.h> | |
42 | #include <asm/elf.h> | |
43 | #include <asm/fpumacro.h> | |
44 | #include <asm/head.h> | |
45 | #include <asm/cpudata.h> | |
74bf4312 | 46 | #include <asm/mmu_context.h> |
1da177e4 | 47 | #include <asm/unistd.h> |
30c91d57 | 48 | #include <asm/hypervisor.h> |
b1422401 | 49 | #include <asm/syscalls.h> |
93dae5b7 DM |
50 | #include <asm/irq_regs.h> |
51 | #include <asm/smp.h> | |
916ca14a | 52 | #include <asm/pcr.h> |
1da177e4 | 53 | |
4f70f7a9 DM |
54 | #include "kstack.h" |
55 | ||
87fa05ae SR |
56 | /* Idle loop support on sparc64. */ |
57 | void arch_cpu_idle(void) | |
1da177e4 | 58 | { |
802c64b3 DM |
59 | if (tlb_type != hypervisor) { |
60 | touch_nmi_watchdog(); | |
87fa05ae | 61 | } else { |
30c91d57 DM |
62 | unsigned long pstate; |
63 | ||
87fa05ae SR |
64 | /* The sun4v sleeping code requires that we have PSTATE.IE cleared over |
65 | * the cpu sleep hypervisor call. | |
66 | */ | |
30c91d57 DM |
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 | ||
87fa05ae | 74 | if (!need_resched() && !cpu_is_offline(smp_processor_id())) |
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 | } |
87fa05ae | 85 | local_irq_enable(); |
30c91d57 | 86 | } |
1da177e4 | 87 | |
e0204409 | 88 | #ifdef CONFIG_HOTPLUG_CPU |
87fa05ae SR |
89 | void arch_cpu_idle_dead() |
90 | { | |
91 | sched_preempt_enable_no_resched(); | |
92 | cpu_play_dead(); | |
1da177e4 | 93 | } |
87fa05ae | 94 | #endif |
1da177e4 | 95 | |
959a85ad | 96 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
97 | static void show_regwindow32(struct pt_regs *regs) |
98 | { | |
99 | struct reg_window32 __user *rw; | |
100 | struct reg_window32 r_w; | |
101 | mm_segment_t old_fs; | |
102 | ||
103 | __asm__ __volatile__ ("flushw"); | |
104 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
105 | old_fs = get_fs(); | |
106 | set_fs (USER_DS); | |
107 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
108 | set_fs (old_fs); | |
109 | return; | |
110 | } | |
111 | ||
112 | set_fs (old_fs); | |
113 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
114 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
115 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
116 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
117 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
118 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
119 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
120 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
121 | } | |
959a85ad DM |
122 | #else |
123 | #define show_regwindow32(regs) do { } while (0) | |
124 | #endif | |
1da177e4 LT |
125 | |
126 | static void show_regwindow(struct pt_regs *regs) | |
127 | { | |
128 | struct reg_window __user *rw; | |
129 | struct reg_window *rwk; | |
130 | struct reg_window r_w; | |
131 | mm_segment_t old_fs; | |
132 | ||
133 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
134 | __asm__ __volatile__ ("flushw"); | |
135 | rw = (struct reg_window __user *) | |
136 | (regs->u_regs[14] + STACK_BIAS); | |
137 | rwk = (struct reg_window *) | |
138 | (regs->u_regs[14] + STACK_BIAS); | |
139 | if (!(regs->tstate & TSTATE_PRIV)) { | |
140 | old_fs = get_fs(); | |
141 | set_fs (USER_DS); | |
142 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
143 | set_fs (old_fs); | |
144 | return; | |
145 | } | |
146 | rwk = &r_w; | |
147 | set_fs (old_fs); | |
148 | } | |
149 | } else { | |
150 | show_regwindow32(regs); | |
151 | return; | |
152 | } | |
153 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
154 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
155 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
156 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
157 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
158 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
159 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
160 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
161 | if (regs->tstate & TSTATE_PRIV) | |
4fe3ebec | 162 | printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
1da177e4 LT |
163 | } |
164 | ||
dbf3e950 | 165 | void show_regs(struct pt_regs *regs) |
1da177e4 | 166 | { |
a43cb95d TH |
167 | show_regs_print_info(KERN_DEFAULT); |
168 | ||
1da177e4 LT |
169 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
170 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
4fe3ebec | 171 | printk("TPC: <%pS>\n", (void *) regs->tpc); |
1da177e4 LT |
172 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
173 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
174 | regs->u_regs[3]); | |
175 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
176 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
177 | regs->u_regs[7]); | |
178 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
179 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
180 | regs->u_regs[11]); | |
181 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
182 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
183 | regs->u_regs[15]); | |
4fe3ebec | 184 | printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
1da177e4 | 185 | show_regwindow(regs); |
87e8f0e3 | 186 | show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); |
1da177e4 LT |
187 | } |
188 | ||
916ca14a DM |
189 | union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; |
190 | static DEFINE_SPINLOCK(global_cpu_snapshot_lock); | |
93dae5b7 DM |
191 | |
192 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, | |
193 | int this_cpu) | |
194 | { | |
916ca14a DM |
195 | struct global_reg_snapshot *rp; |
196 | ||
93dae5b7 DM |
197 | flushw_all(); |
198 | ||
916ca14a DM |
199 | rp = &global_cpu_snapshot[this_cpu].reg; |
200 | ||
201 | rp->tstate = regs->tstate; | |
202 | rp->tpc = regs->tpc; | |
203 | rp->tnpc = regs->tnpc; | |
204 | rp->o7 = regs->u_regs[UREG_I7]; | |
93dae5b7 DM |
205 | |
206 | if (regs->tstate & TSTATE_PRIV) { | |
207 | struct reg_window *rw; | |
208 | ||
209 | rw = (struct reg_window *) | |
210 | (regs->u_regs[UREG_FP] + STACK_BIAS); | |
4f70f7a9 | 211 | if (kstack_valid(tp, (unsigned long) rw)) { |
916ca14a | 212 | rp->i7 = rw->ins[7]; |
5afe2738 DM |
213 | rw = (struct reg_window *) |
214 | (rw->ins[6] + STACK_BIAS); | |
4f70f7a9 | 215 | if (kstack_valid(tp, (unsigned long) rw)) |
916ca14a | 216 | rp->rpc = rw->ins[7]; |
5afe2738 DM |
217 | } |
218 | } else { | |
916ca14a DM |
219 | rp->i7 = 0; |
220 | rp->rpc = 0; | |
5afe2738 | 221 | } |
916ca14a | 222 | rp->thread = tp; |
93dae5b7 DM |
223 | } |
224 | ||
225 | /* In order to avoid hangs we do not try to synchronize with the | |
226 | * global register dump client cpus. The last store they make is to | |
227 | * the thread pointer, so do a short poll waiting for that to become | |
228 | * non-NULL. | |
229 | */ | |
230 | static void __global_reg_poll(struct global_reg_snapshot *gp) | |
231 | { | |
232 | int limit = 0; | |
233 | ||
234 | while (!gp->thread && ++limit < 100) { | |
235 | barrier(); | |
236 | udelay(1); | |
237 | } | |
238 | } | |
239 | ||
47cab6a7 | 240 | void arch_trigger_all_cpu_backtrace(void) |
93dae5b7 DM |
241 | { |
242 | struct thread_info *tp = current_thread_info(); | |
243 | struct pt_regs *regs = get_irq_regs(); | |
93dae5b7 DM |
244 | unsigned long flags; |
245 | int this_cpu, cpu; | |
246 | ||
247 | if (!regs) | |
248 | regs = tp->kregs; | |
249 | ||
916ca14a | 250 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); |
93dae5b7 | 251 | |
916ca14a | 252 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
93dae5b7 DM |
253 | |
254 | this_cpu = raw_smp_processor_id(); | |
255 | ||
256 | __global_reg_self(tp, regs, this_cpu); | |
257 | ||
258 | smp_fetch_global_regs(); | |
259 | ||
260 | for_each_online_cpu(cpu) { | |
916ca14a | 261 | struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg; |
93dae5b7 DM |
262 | |
263 | __global_reg_poll(gp); | |
264 | ||
265 | tp = gp->thread; | |
266 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", | |
267 | (cpu == this_cpu ? '*' : ' '), cpu, | |
268 | gp->tstate, gp->tpc, gp->tnpc, | |
269 | ((tp && tp->task) ? tp->task->comm : "NULL"), | |
270 | ((tp && tp->task) ? tp->task->pid : -1)); | |
4fe3ebec | 271 | |
93dae5b7 | 272 | if (gp->tstate & TSTATE_PRIV) { |
5afe2738 | 273 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
4fe3ebec DM |
274 | (void *) gp->tpc, |
275 | (void *) gp->o7, | |
5afe2738 DM |
276 | (void *) gp->i7, |
277 | (void *) gp->rpc); | |
4fe3ebec | 278 | } else { |
5afe2738 DM |
279 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
280 | gp->tpc, gp->o7, gp->i7, gp->rpc); | |
93dae5b7 DM |
281 | } |
282 | } | |
283 | ||
916ca14a | 284 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
93dae5b7 | 285 | |
916ca14a | 286 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); |
93dae5b7 DM |
287 | } |
288 | ||
09ee167c DM |
289 | #ifdef CONFIG_MAGIC_SYSRQ |
290 | ||
1495cc9d | 291 | static void sysrq_handle_globreg(int key) |
09ee167c | 292 | { |
47cab6a7 | 293 | arch_trigger_all_cpu_backtrace(); |
09ee167c DM |
294 | } |
295 | ||
93dae5b7 DM |
296 | static struct sysrq_key_op sparc_globalreg_op = { |
297 | .handler = sysrq_handle_globreg, | |
5452c7f8 | 298 | .help_msg = "global-regs(y)", |
93dae5b7 DM |
299 | .action_msg = "Show Global CPU Regs", |
300 | }; | |
301 | ||
916ca14a | 302 | static void __global_pmu_self(int this_cpu) |
93dae5b7 | 303 | { |
916ca14a DM |
304 | struct global_pmu_snapshot *pp; |
305 | int i, num; | |
306 | ||
307 | pp = &global_cpu_snapshot[this_cpu].pmu; | |
308 | ||
309 | num = 1; | |
310 | if (tlb_type == hypervisor && | |
311 | sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) | |
312 | num = 4; | |
313 | ||
314 | for (i = 0; i < num; i++) { | |
315 | pp->pcr[i] = pcr_ops->read_pcr(i); | |
316 | pp->pic[i] = pcr_ops->read_pic(i); | |
317 | } | |
93dae5b7 DM |
318 | } |
319 | ||
916ca14a DM |
320 | static void __global_pmu_poll(struct global_pmu_snapshot *pp) |
321 | { | |
322 | int limit = 0; | |
323 | ||
324 | while (!pp->pcr[0] && ++limit < 100) { | |
325 | barrier(); | |
326 | udelay(1); | |
327 | } | |
328 | } | |
329 | ||
330 | static void pmu_snapshot_all_cpus(void) | |
93dae5b7 | 331 | { |
916ca14a DM |
332 | unsigned long flags; |
333 | int this_cpu, cpu; | |
334 | ||
335 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); | |
336 | ||
337 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
338 | ||
339 | this_cpu = raw_smp_processor_id(); | |
340 | ||
341 | __global_pmu_self(this_cpu); | |
342 | ||
343 | smp_fetch_global_pmu(); | |
344 | ||
345 | for_each_online_cpu(cpu) { | |
346 | struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu; | |
347 | ||
348 | __global_pmu_poll(pp); | |
349 | ||
350 | printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n", | |
351 | (cpu == this_cpu ? '*' : ' '), cpu, | |
352 | pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], | |
353 | pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]); | |
354 | } | |
355 | ||
356 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
357 | ||
358 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); | |
359 | } | |
360 | ||
361 | static void sysrq_handle_globpmu(int key) | |
362 | { | |
363 | pmu_snapshot_all_cpus(); | |
364 | } | |
365 | ||
366 | static struct sysrq_key_op sparc_globalpmu_op = { | |
367 | .handler = sysrq_handle_globpmu, | |
5452c7f8 | 368 | .help_msg = "global-pmu(x)", |
916ca14a DM |
369 | .action_msg = "Show Global PMU Regs", |
370 | }; | |
371 | ||
372 | static int __init sparc_sysrq_init(void) | |
373 | { | |
374 | int ret = register_sysrq_key('y', &sparc_globalreg_op); | |
375 | ||
376 | if (!ret) | |
377 | ret = register_sysrq_key('x', &sparc_globalpmu_op); | |
378 | return ret; | |
93dae5b7 DM |
379 | } |
380 | ||
916ca14a | 381 | core_initcall(sparc_sysrq_init); |
93dae5b7 DM |
382 | |
383 | #endif | |
384 | ||
1da177e4 LT |
385 | unsigned long thread_saved_pc(struct task_struct *tsk) |
386 | { | |
f3169641 | 387 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
388 | unsigned long ret = 0xdeadbeefUL; |
389 | ||
390 | if (ti && ti->ksp) { | |
391 | unsigned long *sp; | |
392 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
393 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
394 | sp[14]) { | |
395 | unsigned long *fp; | |
396 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
397 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
398 | ret = fp[15]; | |
399 | } | |
400 | } | |
401 | return ret; | |
402 | } | |
403 | ||
404 | /* Free current thread data structures etc.. */ | |
405 | void exit_thread(void) | |
406 | { | |
407 | struct thread_info *t = current_thread_info(); | |
408 | ||
409 | if (t->utraps) { | |
410 | if (t->utraps[0] < 2) | |
411 | kfree (t->utraps); | |
412 | else | |
413 | t->utraps[0]--; | |
414 | } | |
1da177e4 LT |
415 | } |
416 | ||
417 | void flush_thread(void) | |
418 | { | |
419 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 420 | struct mm_struct *mm; |
1da177e4 | 421 | |
74bf4312 DM |
422 | mm = t->task->mm; |
423 | if (mm) | |
98c5584c | 424 | tsb_context_switch(mm); |
1da177e4 | 425 | |
1da177e4 LT |
426 | set_thread_wsaved(0); |
427 | ||
1da177e4 LT |
428 | /* Clear FPU register state. */ |
429 | t->fpsaved[0] = 0; | |
1da177e4 LT |
430 | } |
431 | ||
432 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
433 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
434 | { | |
517ffce4 | 435 | bool stack_64bit = test_thread_64bit_stack(psp); |
1da177e4 LT |
436 | unsigned long fp, distance, rval; |
437 | ||
517ffce4 | 438 | if (stack_64bit) { |
1da177e4 LT |
439 | csp += STACK_BIAS; |
440 | psp += STACK_BIAS; | |
441 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
442 | fp += STACK_BIAS; | |
517ffce4 DM |
443 | if (test_thread_flag(TIF_32BIT)) |
444 | fp &= 0xffffffff; | |
1da177e4 LT |
445 | } else |
446 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
447 | ||
f036d9f3 DM |
448 | /* Now align the stack as this is mandatory in the Sparc ABI |
449 | * due to how register windows work. This hides the | |
450 | * restriction from thread libraries etc. | |
1da177e4 | 451 | */ |
f036d9f3 | 452 | csp &= ~15UL; |
1da177e4 LT |
453 | |
454 | distance = fp - psp; | |
455 | rval = (csp - distance); | |
456 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
457 | rval = 0; | |
517ffce4 | 458 | else if (!stack_64bit) { |
1da177e4 LT |
459 | if (put_user(((u32)csp), |
460 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
461 | rval = 0; | |
462 | } else { | |
463 | if (put_user(((u64)csp - STACK_BIAS), | |
464 | &(((struct reg_window __user *)rval)->ins[6]))) | |
465 | rval = 0; | |
466 | else | |
467 | rval = rval - STACK_BIAS; | |
468 | } | |
469 | ||
470 | return rval; | |
471 | } | |
472 | ||
473 | /* Standard stuff. */ | |
474 | static inline void shift_window_buffer(int first_win, int last_win, | |
475 | struct thread_info *t) | |
476 | { | |
477 | int i; | |
478 | ||
479 | for (i = first_win; i < last_win; i++) { | |
480 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
481 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
482 | sizeof(struct reg_window)); | |
483 | } | |
484 | } | |
485 | ||
486 | void synchronize_user_stack(void) | |
487 | { | |
488 | struct thread_info *t = current_thread_info(); | |
489 | unsigned long window; | |
490 | ||
491 | flush_user_windows(); | |
492 | if ((window = get_thread_wsaved()) != 0) { | |
1da177e4 LT |
493 | window -= 1; |
494 | do { | |
1da177e4 | 495 | struct reg_window *rwin = &t->reg_window[window]; |
517ffce4 DM |
496 | int winsize = sizeof(struct reg_window); |
497 | unsigned long sp; | |
498 | ||
499 | sp = t->rwbuf_stkptrs[window]; | |
500 | ||
501 | if (test_thread_64bit_stack(sp)) | |
502 | sp += STACK_BIAS; | |
503 | else | |
504 | winsize = sizeof(struct reg_window32); | |
1da177e4 LT |
505 | |
506 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
507 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
508 | set_thread_wsaved(get_thread_wsaved() - 1); | |
509 | } | |
510 | } while (window--); | |
511 | } | |
512 | } | |
513 | ||
314ef685 DM |
514 | static void stack_unaligned(unsigned long sp) |
515 | { | |
516 | siginfo_t info; | |
517 | ||
518 | info.si_signo = SIGBUS; | |
519 | info.si_errno = 0; | |
520 | info.si_code = BUS_ADRALN; | |
521 | info.si_addr = (void __user *) sp; | |
522 | info.si_trapno = 0; | |
523 | force_sig_info(SIGBUS, &info, current); | |
524 | } | |
525 | ||
1da177e4 LT |
526 | void fault_in_user_windows(void) |
527 | { | |
528 | struct thread_info *t = current_thread_info(); | |
529 | unsigned long window; | |
1da177e4 LT |
530 | |
531 | flush_user_windows(); | |
532 | window = get_thread_wsaved(); | |
533 | ||
314ef685 | 534 | if (likely(window != 0)) { |
1da177e4 LT |
535 | window -= 1; |
536 | do { | |
1da177e4 | 537 | struct reg_window *rwin = &t->reg_window[window]; |
517ffce4 DM |
538 | int winsize = sizeof(struct reg_window); |
539 | unsigned long sp; | |
540 | ||
541 | sp = t->rwbuf_stkptrs[window]; | |
542 | ||
543 | if (test_thread_64bit_stack(sp)) | |
544 | sp += STACK_BIAS; | |
545 | else | |
546 | winsize = sizeof(struct reg_window32); | |
1da177e4 | 547 | |
314ef685 DM |
548 | if (unlikely(sp & 0x7UL)) |
549 | stack_unaligned(sp); | |
550 | ||
551 | if (unlikely(copy_to_user((char __user *)sp, | |
552 | rwin, winsize))) | |
1da177e4 LT |
553 | goto barf; |
554 | } while (window--); | |
555 | } | |
556 | set_thread_wsaved(0); | |
557 | return; | |
558 | ||
559 | barf: | |
560 | set_thread_wsaved(window + 1); | |
812cb83a | 561 | user_exit(); |
1da177e4 LT |
562 | do_exit(SIGILL); |
563 | } | |
564 | ||
565 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
566 | unsigned long stack_start, | |
567 | struct pt_regs *regs, | |
568 | unsigned long stack_size) | |
569 | { | |
570 | int __user *parent_tid_ptr, *child_tid_ptr; | |
1e38c126 DM |
571 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
572 | long ret; | |
1da177e4 LT |
573 | |
574 | #ifdef CONFIG_COMPAT | |
575 | if (test_thread_flag(TIF_32BIT)) { | |
576 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
577 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
578 | } else | |
579 | #endif | |
580 | { | |
581 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
582 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
583 | } | |
584 | ||
e80d6661 | 585 | ret = do_fork(clone_flags, stack_start, stack_size, |
1e38c126 DM |
586 | parent_tid_ptr, child_tid_ptr); |
587 | ||
588 | /* If we get an error and potentially restart the system | |
589 | * call, we're screwed because copy_thread() clobbered | |
590 | * the parent's %o1. So detect that case and restore it | |
591 | * here. | |
592 | */ | |
593 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
594 | regs->u_regs[UREG_I1] = orig_i1; | |
595 | ||
596 | return ret; | |
1da177e4 LT |
597 | } |
598 | ||
599 | /* Copy a Sparc thread. The fork() return value conventions | |
600 | * under SunOS are nothing short of bletcherous: | |
601 | * Parent --> %o0 == childs pid, %o1 == 0 | |
602 | * Child --> %o0 == parents pid, %o1 == 1 | |
603 | */ | |
6f2c55b8 | 604 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
afa86fc4 | 605 | unsigned long arg, struct task_struct *p) |
1da177e4 | 606 | { |
ee3eea16 | 607 | struct thread_info *t = task_thread_info(p); |
afa86fc4 | 608 | struct pt_regs *regs = current_pt_regs(); |
a051bc5b DM |
609 | struct sparc_stackf *parent_sf; |
610 | unsigned long child_stack_sz; | |
1da177e4 | 611 | char *child_trap_frame; |
1da177e4 | 612 | |
a051bc5b | 613 | /* Calculate offset to stack_frame & pt_regs */ |
1918c7f5 | 614 | child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ); |
a051bc5b DM |
615 | child_trap_frame = (task_stack_page(p) + |
616 | (THREAD_SIZE - child_stack_sz)); | |
a051bc5b | 617 | |
db7d9a4e | 618 | t->new_child = 1; |
1da177e4 | 619 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
a051bc5b DM |
620 | t->kregs = (struct pt_regs *) (child_trap_frame + |
621 | sizeof(struct sparc_stackf)); | |
1da177e4 LT |
622 | t->fpsaved[0] = 0; |
623 | ||
1918c7f5 AV |
624 | if (unlikely(p->flags & PF_KTHREAD)) { |
625 | memset(child_trap_frame, 0, child_stack_sz); | |
626 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = | |
627 | (current_pt_regs()->tstate + 1) & TSTATE_CWP; | |
dff933da | 628 | t->current_ds = ASI_P; |
1918c7f5 AV |
629 | t->kregs->u_regs[UREG_G1] = sp; /* function */ |
630 | t->kregs->u_regs[UREG_G2] = arg; | |
631 | return 0; | |
1da177e4 LT |
632 | } |
633 | ||
1918c7f5 AV |
634 | parent_sf = ((struct sparc_stackf *) regs) - 1; |
635 | memcpy(child_trap_frame, parent_sf, child_stack_sz); | |
636 | if (t->flags & _TIF_32BIT) { | |
637 | sp &= 0x00000000ffffffffUL; | |
638 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
639 | } | |
640 | t->kregs->u_regs[UREG_FP] = sp; | |
641 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = | |
642 | (regs->tstate + 1) & TSTATE_CWP; | |
643 | t->current_ds = ASI_AIUS; | |
644 | if (sp != regs->u_regs[UREG_FP]) { | |
645 | unsigned long csp; | |
646 | ||
647 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
648 | if (!csp) | |
649 | return -EFAULT; | |
650 | t->kregs->u_regs[UREG_FP] = csp; | |
651 | } | |
652 | if (t->utraps) | |
653 | t->utraps[0]++; | |
654 | ||
1da177e4 LT |
655 | /* Set the return value for the child. */ |
656 | t->kregs->u_regs[UREG_I0] = current->pid; | |
657 | t->kregs->u_regs[UREG_I1] = 1; | |
658 | ||
659 | /* Set the second return value for the parent. */ | |
660 | regs->u_regs[UREG_I1] = 0; | |
661 | ||
662 | if (clone_flags & CLONE_SETTLS) | |
663 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
1da177e4 LT |
668 | typedef struct { |
669 | union { | |
670 | unsigned int pr_regs[32]; | |
671 | unsigned long pr_dregs[16]; | |
672 | } pr_fr; | |
673 | unsigned int __unused; | |
674 | unsigned int pr_fsr; | |
675 | unsigned char pr_qcnt; | |
676 | unsigned char pr_q_entrysize; | |
677 | unsigned char pr_en; | |
678 | unsigned int pr_q[64]; | |
679 | } elf_fpregset_t32; | |
680 | ||
681 | /* | |
682 | * fill in the fpu structure for a core dump. | |
683 | */ | |
684 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
685 | { | |
686 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
687 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
688 | ||
689 | if (test_thread_flag(TIF_32BIT)) { | |
690 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
691 | ||
692 | if (fprs & FPRS_DL) | |
693 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
694 | sizeof(unsigned int) * 32); | |
695 | else | |
696 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
697 | sizeof(unsigned int) * 32); | |
698 | fpregs32->pr_qcnt = 0; | |
699 | fpregs32->pr_q_entrysize = 8; | |
700 | memset(&fpregs32->pr_q[0], 0, | |
701 | (sizeof(unsigned int) * 64)); | |
702 | if (fprs & FPRS_FEF) { | |
703 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
704 | fpregs32->pr_en = 1; | |
705 | } else { | |
706 | fpregs32->pr_fsr = 0; | |
707 | fpregs32->pr_en = 0; | |
708 | } | |
709 | } else { | |
710 | if(fprs & FPRS_DL) | |
711 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
712 | sizeof(unsigned int) * 32); | |
713 | else | |
714 | memset(&fpregs->pr_regs[0], 0, | |
715 | sizeof(unsigned int) * 32); | |
716 | if(fprs & FPRS_DU) | |
717 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
718 | sizeof(unsigned int) * 32); | |
719 | else | |
720 | memset(&fpregs->pr_regs[16], 0, | |
721 | sizeof(unsigned int) * 32); | |
722 | if(fprs & FPRS_FEF) { | |
723 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
724 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
725 | } else { | |
726 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
727 | } | |
728 | fpregs->pr_fprs = fprs; | |
729 | } | |
730 | return 1; | |
731 | } | |
917c3660 | 732 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 | 733 | |
1da177e4 LT |
734 | unsigned long get_wchan(struct task_struct *task) |
735 | { | |
736 | unsigned long pc, fp, bias = 0; | |
4f70f7a9 | 737 | struct thread_info *tp; |
1da177e4 LT |
738 | struct reg_window *rw; |
739 | unsigned long ret = 0; | |
740 | int count = 0; | |
741 | ||
742 | if (!task || task == current || | |
743 | task->state == TASK_RUNNING) | |
744 | goto out; | |
745 | ||
4f70f7a9 | 746 | tp = task_thread_info(task); |
1da177e4 | 747 | bias = STACK_BIAS; |
f3169641 | 748 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
749 | |
750 | do { | |
4f70f7a9 | 751 | if (!kstack_valid(tp, fp)) |
1da177e4 LT |
752 | break; |
753 | rw = (struct reg_window *) fp; | |
754 | pc = rw->ins[7]; | |
755 | if (!in_sched_functions(pc)) { | |
756 | ret = pc; | |
757 | goto out; | |
758 | } | |
759 | fp = rw->ins[6] + bias; | |
760 | } while (++count < 16); | |
761 | ||
762 | out: | |
763 | return ret; | |
764 | } |