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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 | 16 | #include <linux/sched.h> |
b17b0153 | 17 | #include <linux/sched/debug.h> |
29930025 | 18 | #include <linux/sched/task.h> |
1da177e4 | 19 | #include <linux/kernel.h> |
1da177e4 | 20 | #include <linux/mm.h> |
4e950f6f | 21 | #include <linux/fs.h> |
1da177e4 | 22 | #include <linux/smp.h> |
1da177e4 LT |
23 | #include <linux/stddef.h> |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/user.h> | |
1da177e4 LT |
27 | #include <linux/delay.h> |
28 | #include <linux/compat.h> | |
038cb01e | 29 | #include <linux/tick.h> |
1da177e4 | 30 | #include <linux/init.h> |
e0204409 | 31 | #include <linux/cpu.h> |
916ca14a | 32 | #include <linux/perf_event.h> |
b1422401 | 33 | #include <linux/elfcore.h> |
93dae5b7 | 34 | #include <linux/sysrq.h> |
802c64b3 | 35 | #include <linux/nmi.h> |
812cb83a | 36 | #include <linux/context_tracking.h> |
1da177e4 | 37 | |
7c0f6ba6 | 38 | #include <linux/uaccess.h> |
1da177e4 LT |
39 | #include <asm/page.h> |
40 | #include <asm/pgalloc.h> | |
41 | #include <asm/pgtable.h> | |
42 | #include <asm/processor.h> | |
43 | #include <asm/pstate.h> | |
44 | #include <asm/elf.h> | |
45 | #include <asm/fpumacro.h> | |
46 | #include <asm/head.h> | |
47 | #include <asm/cpudata.h> | |
74bf4312 | 48 | #include <asm/mmu_context.h> |
1da177e4 | 49 | #include <asm/unistd.h> |
30c91d57 | 50 | #include <asm/hypervisor.h> |
b1422401 | 51 | #include <asm/syscalls.h> |
93dae5b7 DM |
52 | #include <asm/irq_regs.h> |
53 | #include <asm/smp.h> | |
916ca14a | 54 | #include <asm/pcr.h> |
1da177e4 | 55 | |
4f70f7a9 DM |
56 | #include "kstack.h" |
57 | ||
87fa05ae SR |
58 | /* Idle loop support on sparc64. */ |
59 | void arch_cpu_idle(void) | |
1da177e4 | 60 | { |
802c64b3 DM |
61 | if (tlb_type != hypervisor) { |
62 | touch_nmi_watchdog(); | |
cb3042d6 | 63 | local_irq_enable(); |
87fa05ae | 64 | } else { |
30c91d57 DM |
65 | unsigned long pstate; |
66 | ||
cb3042d6 DM |
67 | local_irq_enable(); |
68 | ||
87fa05ae SR |
69 | /* The sun4v sleeping code requires that we have PSTATE.IE cleared over |
70 | * the cpu sleep hypervisor call. | |
71 | */ | |
30c91d57 DM |
72 | __asm__ __volatile__( |
73 | "rdpr %%pstate, %0\n\t" | |
74 | "andn %0, %1, %0\n\t" | |
75 | "wrpr %0, %%g0, %%pstate" | |
76 | : "=&r" (pstate) | |
77 | : "i" (PSTATE_IE)); | |
78 | ||
87fa05ae | 79 | if (!need_resched() && !cpu_is_offline(smp_processor_id())) |
30c91d57 DM |
80 | sun4v_cpu_yield(); |
81 | ||
82 | /* Re-enable interrupts. */ | |
83 | __asm__ __volatile__( | |
84 | "rdpr %%pstate, %0\n\t" | |
85 | "or %0, %1, %0\n\t" | |
86 | "wrpr %0, %%g0, %%pstate" | |
87 | : "=&r" (pstate) | |
88 | : "i" (PSTATE_IE)); | |
1da177e4 | 89 | } |
30c91d57 | 90 | } |
1da177e4 | 91 | |
e0204409 | 92 | #ifdef CONFIG_HOTPLUG_CPU |
d1584504 | 93 | void arch_cpu_idle_dead(void) |
87fa05ae SR |
94 | { |
95 | sched_preempt_enable_no_resched(); | |
96 | cpu_play_dead(); | |
1da177e4 | 97 | } |
87fa05ae | 98 | #endif |
1da177e4 | 99 | |
959a85ad | 100 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
101 | static void show_regwindow32(struct pt_regs *regs) |
102 | { | |
103 | struct reg_window32 __user *rw; | |
104 | struct reg_window32 r_w; | |
105 | mm_segment_t old_fs; | |
106 | ||
107 | __asm__ __volatile__ ("flushw"); | |
9ef595d8 | 108 | rw = compat_ptr((unsigned int)regs->u_regs[14]); |
1da177e4 LT |
109 | old_fs = get_fs(); |
110 | set_fs (USER_DS); | |
111 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
112 | set_fs (old_fs); | |
113 | return; | |
114 | } | |
115 | ||
116 | set_fs (old_fs); | |
117 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
118 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
119 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
120 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
121 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
122 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
123 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
124 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
125 | } | |
959a85ad DM |
126 | #else |
127 | #define show_regwindow32(regs) do { } while (0) | |
128 | #endif | |
1da177e4 LT |
129 | |
130 | static void show_regwindow(struct pt_regs *regs) | |
131 | { | |
132 | struct reg_window __user *rw; | |
133 | struct reg_window *rwk; | |
134 | struct reg_window r_w; | |
135 | mm_segment_t old_fs; | |
136 | ||
137 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
138 | __asm__ __volatile__ ("flushw"); | |
139 | rw = (struct reg_window __user *) | |
140 | (regs->u_regs[14] + STACK_BIAS); | |
141 | rwk = (struct reg_window *) | |
142 | (regs->u_regs[14] + STACK_BIAS); | |
143 | if (!(regs->tstate & TSTATE_PRIV)) { | |
144 | old_fs = get_fs(); | |
145 | set_fs (USER_DS); | |
146 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
147 | set_fs (old_fs); | |
148 | return; | |
149 | } | |
150 | rwk = &r_w; | |
151 | set_fs (old_fs); | |
152 | } | |
153 | } else { | |
154 | show_regwindow32(regs); | |
155 | return; | |
156 | } | |
157 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
158 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
159 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
160 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
161 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
162 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
163 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
164 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
165 | if (regs->tstate & TSTATE_PRIV) | |
4fe3ebec | 166 | printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
1da177e4 LT |
167 | } |
168 | ||
dbf3e950 | 169 | void show_regs(struct pt_regs *regs) |
1da177e4 | 170 | { |
a43cb95d TH |
171 | show_regs_print_info(KERN_DEFAULT); |
172 | ||
1da177e4 LT |
173 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
174 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
4fe3ebec | 175 | printk("TPC: <%pS>\n", (void *) regs->tpc); |
1da177e4 LT |
176 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
177 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
178 | regs->u_regs[3]); | |
179 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
180 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
181 | regs->u_regs[7]); | |
182 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
183 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
184 | regs->u_regs[11]); | |
185 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
186 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
187 | regs->u_regs[15]); | |
4fe3ebec | 188 | printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
1da177e4 | 189 | show_regwindow(regs); |
87e8f0e3 | 190 | show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); |
1da177e4 LT |
191 | } |
192 | ||
916ca14a DM |
193 | union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; |
194 | static DEFINE_SPINLOCK(global_cpu_snapshot_lock); | |
93dae5b7 DM |
195 | |
196 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, | |
197 | int this_cpu) | |
198 | { | |
916ca14a DM |
199 | struct global_reg_snapshot *rp; |
200 | ||
93dae5b7 DM |
201 | flushw_all(); |
202 | ||
916ca14a DM |
203 | rp = &global_cpu_snapshot[this_cpu].reg; |
204 | ||
205 | rp->tstate = regs->tstate; | |
206 | rp->tpc = regs->tpc; | |
207 | rp->tnpc = regs->tnpc; | |
208 | rp->o7 = regs->u_regs[UREG_I7]; | |
93dae5b7 DM |
209 | |
210 | if (regs->tstate & TSTATE_PRIV) { | |
211 | struct reg_window *rw; | |
212 | ||
213 | rw = (struct reg_window *) | |
214 | (regs->u_regs[UREG_FP] + STACK_BIAS); | |
4f70f7a9 | 215 | if (kstack_valid(tp, (unsigned long) rw)) { |
916ca14a | 216 | rp->i7 = rw->ins[7]; |
5afe2738 DM |
217 | rw = (struct reg_window *) |
218 | (rw->ins[6] + STACK_BIAS); | |
4f70f7a9 | 219 | if (kstack_valid(tp, (unsigned long) rw)) |
916ca14a | 220 | rp->rpc = rw->ins[7]; |
5afe2738 DM |
221 | } |
222 | } else { | |
916ca14a DM |
223 | rp->i7 = 0; |
224 | rp->rpc = 0; | |
5afe2738 | 225 | } |
916ca14a | 226 | rp->thread = tp; |
93dae5b7 DM |
227 | } |
228 | ||
229 | /* In order to avoid hangs we do not try to synchronize with the | |
230 | * global register dump client cpus. The last store they make is to | |
231 | * the thread pointer, so do a short poll waiting for that to become | |
232 | * non-NULL. | |
233 | */ | |
234 | static void __global_reg_poll(struct global_reg_snapshot *gp) | |
235 | { | |
236 | int limit = 0; | |
237 | ||
238 | while (!gp->thread && ++limit < 100) { | |
239 | barrier(); | |
240 | udelay(1); | |
241 | } | |
242 | } | |
243 | ||
9a01c3ed | 244 | void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) |
93dae5b7 DM |
245 | { |
246 | struct thread_info *tp = current_thread_info(); | |
247 | struct pt_regs *regs = get_irq_regs(); | |
93dae5b7 DM |
248 | unsigned long flags; |
249 | int this_cpu, cpu; | |
250 | ||
251 | if (!regs) | |
252 | regs = tp->kregs; | |
253 | ||
916ca14a | 254 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); |
93dae5b7 | 255 | |
93dae5b7 DM |
256 | this_cpu = raw_smp_processor_id(); |
257 | ||
f3aca3d0 AT |
258 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
259 | ||
9a01c3ed | 260 | if (cpumask_test_cpu(this_cpu, mask) && !exclude_self) |
f3aca3d0 | 261 | __global_reg_self(tp, regs, this_cpu); |
93dae5b7 DM |
262 | |
263 | smp_fetch_global_regs(); | |
264 | ||
9a01c3ed | 265 | for_each_cpu(cpu, mask) { |
f3aca3d0 AT |
266 | struct global_reg_snapshot *gp; |
267 | ||
9a01c3ed | 268 | if (exclude_self && cpu == this_cpu) |
f3aca3d0 AT |
269 | continue; |
270 | ||
271 | gp = &global_cpu_snapshot[cpu].reg; | |
93dae5b7 DM |
272 | |
273 | __global_reg_poll(gp); | |
274 | ||
275 | tp = gp->thread; | |
276 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", | |
277 | (cpu == this_cpu ? '*' : ' '), cpu, | |
278 | gp->tstate, gp->tpc, gp->tnpc, | |
279 | ((tp && tp->task) ? tp->task->comm : "NULL"), | |
280 | ((tp && tp->task) ? tp->task->pid : -1)); | |
4fe3ebec | 281 | |
93dae5b7 | 282 | if (gp->tstate & TSTATE_PRIV) { |
5afe2738 | 283 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
4fe3ebec DM |
284 | (void *) gp->tpc, |
285 | (void *) gp->o7, | |
5afe2738 DM |
286 | (void *) gp->i7, |
287 | (void *) gp->rpc); | |
4fe3ebec | 288 | } else { |
5afe2738 DM |
289 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
290 | gp->tpc, gp->o7, gp->i7, gp->rpc); | |
93dae5b7 | 291 | } |
31aaa98c DA |
292 | |
293 | touch_nmi_watchdog(); | |
93dae5b7 DM |
294 | } |
295 | ||
916ca14a | 296 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
93dae5b7 | 297 | |
916ca14a | 298 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); |
93dae5b7 DM |
299 | } |
300 | ||
09ee167c DM |
301 | #ifdef CONFIG_MAGIC_SYSRQ |
302 | ||
1495cc9d | 303 | static void sysrq_handle_globreg(int key) |
09ee167c | 304 | { |
9a01c3ed | 305 | trigger_all_cpu_backtrace(); |
09ee167c DM |
306 | } |
307 | ||
93dae5b7 DM |
308 | static struct sysrq_key_op sparc_globalreg_op = { |
309 | .handler = sysrq_handle_globreg, | |
5452c7f8 | 310 | .help_msg = "global-regs(y)", |
93dae5b7 DM |
311 | .action_msg = "Show Global CPU Regs", |
312 | }; | |
313 | ||
916ca14a | 314 | static void __global_pmu_self(int this_cpu) |
93dae5b7 | 315 | { |
916ca14a DM |
316 | struct global_pmu_snapshot *pp; |
317 | int i, num; | |
318 | ||
8bccf5b3 DM |
319 | if (!pcr_ops) |
320 | return; | |
321 | ||
916ca14a DM |
322 | pp = &global_cpu_snapshot[this_cpu].pmu; |
323 | ||
324 | num = 1; | |
325 | if (tlb_type == hypervisor && | |
326 | sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) | |
327 | num = 4; | |
328 | ||
329 | for (i = 0; i < num; i++) { | |
330 | pp->pcr[i] = pcr_ops->read_pcr(i); | |
331 | pp->pic[i] = pcr_ops->read_pic(i); | |
332 | } | |
93dae5b7 DM |
333 | } |
334 | ||
916ca14a DM |
335 | static void __global_pmu_poll(struct global_pmu_snapshot *pp) |
336 | { | |
337 | int limit = 0; | |
338 | ||
339 | while (!pp->pcr[0] && ++limit < 100) { | |
340 | barrier(); | |
341 | udelay(1); | |
342 | } | |
343 | } | |
344 | ||
345 | static void pmu_snapshot_all_cpus(void) | |
93dae5b7 | 346 | { |
916ca14a DM |
347 | unsigned long flags; |
348 | int this_cpu, cpu; | |
349 | ||
350 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); | |
351 | ||
352 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
353 | ||
354 | this_cpu = raw_smp_processor_id(); | |
355 | ||
356 | __global_pmu_self(this_cpu); | |
357 | ||
358 | smp_fetch_global_pmu(); | |
359 | ||
360 | for_each_online_cpu(cpu) { | |
361 | struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu; | |
362 | ||
363 | __global_pmu_poll(pp); | |
364 | ||
365 | printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n", | |
366 | (cpu == this_cpu ? '*' : ' '), cpu, | |
367 | pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], | |
368 | pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]); | |
31aaa98c DA |
369 | |
370 | touch_nmi_watchdog(); | |
916ca14a DM |
371 | } |
372 | ||
373 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
374 | ||
375 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); | |
376 | } | |
377 | ||
378 | static void sysrq_handle_globpmu(int key) | |
379 | { | |
380 | pmu_snapshot_all_cpus(); | |
381 | } | |
382 | ||
383 | static struct sysrq_key_op sparc_globalpmu_op = { | |
384 | .handler = sysrq_handle_globpmu, | |
5452c7f8 | 385 | .help_msg = "global-pmu(x)", |
916ca14a DM |
386 | .action_msg = "Show Global PMU Regs", |
387 | }; | |
388 | ||
389 | static int __init sparc_sysrq_init(void) | |
390 | { | |
391 | int ret = register_sysrq_key('y', &sparc_globalreg_op); | |
392 | ||
393 | if (!ret) | |
394 | ret = register_sysrq_key('x', &sparc_globalpmu_op); | |
395 | return ret; | |
93dae5b7 DM |
396 | } |
397 | ||
916ca14a | 398 | core_initcall(sparc_sysrq_init); |
93dae5b7 DM |
399 | |
400 | #endif | |
401 | ||
1da177e4 LT |
402 | unsigned long thread_saved_pc(struct task_struct *tsk) |
403 | { | |
f3169641 | 404 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
405 | unsigned long ret = 0xdeadbeefUL; |
406 | ||
407 | if (ti && ti->ksp) { | |
408 | unsigned long *sp; | |
409 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
410 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
411 | sp[14]) { | |
412 | unsigned long *fp; | |
413 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
414 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
415 | ret = fp[15]; | |
416 | } | |
417 | } | |
418 | return ret; | |
419 | } | |
420 | ||
421 | /* Free current thread data structures etc.. */ | |
e6464694 | 422 | void exit_thread(struct task_struct *tsk) |
1da177e4 | 423 | { |
e6464694 | 424 | struct thread_info *t = task_thread_info(tsk); |
1da177e4 LT |
425 | |
426 | if (t->utraps) { | |
427 | if (t->utraps[0] < 2) | |
428 | kfree (t->utraps); | |
429 | else | |
430 | t->utraps[0]--; | |
431 | } | |
1da177e4 LT |
432 | } |
433 | ||
434 | void flush_thread(void) | |
435 | { | |
436 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 437 | struct mm_struct *mm; |
1da177e4 | 438 | |
74bf4312 DM |
439 | mm = t->task->mm; |
440 | if (mm) | |
98c5584c | 441 | tsb_context_switch(mm); |
1da177e4 | 442 | |
1da177e4 LT |
443 | set_thread_wsaved(0); |
444 | ||
1da177e4 LT |
445 | /* Clear FPU register state. */ |
446 | t->fpsaved[0] = 0; | |
1da177e4 LT |
447 | } |
448 | ||
449 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
450 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
451 | { | |
517ffce4 | 452 | bool stack_64bit = test_thread_64bit_stack(psp); |
1da177e4 LT |
453 | unsigned long fp, distance, rval; |
454 | ||
517ffce4 | 455 | if (stack_64bit) { |
1da177e4 LT |
456 | csp += STACK_BIAS; |
457 | psp += STACK_BIAS; | |
458 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
459 | fp += STACK_BIAS; | |
517ffce4 DM |
460 | if (test_thread_flag(TIF_32BIT)) |
461 | fp &= 0xffffffff; | |
1da177e4 LT |
462 | } else |
463 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
464 | ||
f036d9f3 DM |
465 | /* Now align the stack as this is mandatory in the Sparc ABI |
466 | * due to how register windows work. This hides the | |
467 | * restriction from thread libraries etc. | |
1da177e4 | 468 | */ |
f036d9f3 | 469 | csp &= ~15UL; |
1da177e4 LT |
470 | |
471 | distance = fp - psp; | |
472 | rval = (csp - distance); | |
473 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
474 | rval = 0; | |
517ffce4 | 475 | else if (!stack_64bit) { |
1da177e4 LT |
476 | if (put_user(((u32)csp), |
477 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
478 | rval = 0; | |
479 | } else { | |
480 | if (put_user(((u64)csp - STACK_BIAS), | |
481 | &(((struct reg_window __user *)rval)->ins[6]))) | |
482 | rval = 0; | |
483 | else | |
484 | rval = rval - STACK_BIAS; | |
485 | } | |
486 | ||
487 | return rval; | |
488 | } | |
489 | ||
490 | /* Standard stuff. */ | |
491 | static inline void shift_window_buffer(int first_win, int last_win, | |
492 | struct thread_info *t) | |
493 | { | |
494 | int i; | |
495 | ||
496 | for (i = first_win; i < last_win; i++) { | |
497 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
498 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
499 | sizeof(struct reg_window)); | |
500 | } | |
501 | } | |
502 | ||
503 | void synchronize_user_stack(void) | |
504 | { | |
505 | struct thread_info *t = current_thread_info(); | |
506 | unsigned long window; | |
507 | ||
508 | flush_user_windows(); | |
509 | if ((window = get_thread_wsaved()) != 0) { | |
1da177e4 LT |
510 | window -= 1; |
511 | do { | |
1da177e4 | 512 | struct reg_window *rwin = &t->reg_window[window]; |
517ffce4 DM |
513 | int winsize = sizeof(struct reg_window); |
514 | unsigned long sp; | |
515 | ||
516 | sp = t->rwbuf_stkptrs[window]; | |
517 | ||
518 | if (test_thread_64bit_stack(sp)) | |
519 | sp += STACK_BIAS; | |
520 | else | |
521 | winsize = sizeof(struct reg_window32); | |
1da177e4 LT |
522 | |
523 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
524 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
525 | set_thread_wsaved(get_thread_wsaved() - 1); | |
526 | } | |
527 | } while (window--); | |
528 | } | |
529 | } | |
530 | ||
314ef685 DM |
531 | static void stack_unaligned(unsigned long sp) |
532 | { | |
533 | siginfo_t info; | |
534 | ||
535 | info.si_signo = SIGBUS; | |
536 | info.si_errno = 0; | |
537 | info.si_code = BUS_ADRALN; | |
538 | info.si_addr = (void __user *) sp; | |
539 | info.si_trapno = 0; | |
540 | force_sig_info(SIGBUS, &info, current); | |
541 | } | |
542 | ||
1da177e4 LT |
543 | void fault_in_user_windows(void) |
544 | { | |
545 | struct thread_info *t = current_thread_info(); | |
546 | unsigned long window; | |
1da177e4 LT |
547 | |
548 | flush_user_windows(); | |
549 | window = get_thread_wsaved(); | |
550 | ||
314ef685 | 551 | if (likely(window != 0)) { |
1da177e4 LT |
552 | window -= 1; |
553 | do { | |
1da177e4 | 554 | struct reg_window *rwin = &t->reg_window[window]; |
517ffce4 DM |
555 | int winsize = sizeof(struct reg_window); |
556 | unsigned long sp; | |
557 | ||
558 | sp = t->rwbuf_stkptrs[window]; | |
559 | ||
560 | if (test_thread_64bit_stack(sp)) | |
561 | sp += STACK_BIAS; | |
562 | else | |
563 | winsize = sizeof(struct reg_window32); | |
1da177e4 | 564 | |
314ef685 DM |
565 | if (unlikely(sp & 0x7UL)) |
566 | stack_unaligned(sp); | |
567 | ||
568 | if (unlikely(copy_to_user((char __user *)sp, | |
569 | rwin, winsize))) | |
1da177e4 LT |
570 | goto barf; |
571 | } while (window--); | |
572 | } | |
573 | set_thread_wsaved(0); | |
574 | return; | |
575 | ||
576 | barf: | |
577 | set_thread_wsaved(window + 1); | |
812cb83a | 578 | user_exit(); |
1da177e4 LT |
579 | do_exit(SIGILL); |
580 | } | |
581 | ||
582 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
583 | unsigned long stack_start, | |
584 | struct pt_regs *regs, | |
585 | unsigned long stack_size) | |
586 | { | |
587 | int __user *parent_tid_ptr, *child_tid_ptr; | |
1e38c126 DM |
588 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
589 | long ret; | |
1da177e4 LT |
590 | |
591 | #ifdef CONFIG_COMPAT | |
592 | if (test_thread_flag(TIF_32BIT)) { | |
593 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
594 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
595 | } else | |
596 | #endif | |
597 | { | |
598 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
599 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
600 | } | |
601 | ||
e80d6661 | 602 | ret = do_fork(clone_flags, stack_start, stack_size, |
1e38c126 DM |
603 | parent_tid_ptr, child_tid_ptr); |
604 | ||
605 | /* If we get an error and potentially restart the system | |
606 | * call, we're screwed because copy_thread() clobbered | |
607 | * the parent's %o1. So detect that case and restore it | |
608 | * here. | |
609 | */ | |
610 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
611 | regs->u_regs[UREG_I1] = orig_i1; | |
612 | ||
613 | return ret; | |
1da177e4 LT |
614 | } |
615 | ||
616 | /* Copy a Sparc thread. The fork() return value conventions | |
617 | * under SunOS are nothing short of bletcherous: | |
618 | * Parent --> %o0 == childs pid, %o1 == 0 | |
619 | * Child --> %o0 == parents pid, %o1 == 1 | |
620 | */ | |
6f2c55b8 | 621 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
afa86fc4 | 622 | unsigned long arg, struct task_struct *p) |
1da177e4 | 623 | { |
ee3eea16 | 624 | struct thread_info *t = task_thread_info(p); |
afa86fc4 | 625 | struct pt_regs *regs = current_pt_regs(); |
a051bc5b DM |
626 | struct sparc_stackf *parent_sf; |
627 | unsigned long child_stack_sz; | |
1da177e4 | 628 | char *child_trap_frame; |
1da177e4 | 629 | |
a051bc5b | 630 | /* Calculate offset to stack_frame & pt_regs */ |
1918c7f5 | 631 | child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ); |
a051bc5b DM |
632 | child_trap_frame = (task_stack_page(p) + |
633 | (THREAD_SIZE - child_stack_sz)); | |
a051bc5b | 634 | |
db7d9a4e | 635 | t->new_child = 1; |
1da177e4 | 636 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
a051bc5b DM |
637 | t->kregs = (struct pt_regs *) (child_trap_frame + |
638 | sizeof(struct sparc_stackf)); | |
1da177e4 LT |
639 | t->fpsaved[0] = 0; |
640 | ||
1918c7f5 AV |
641 | if (unlikely(p->flags & PF_KTHREAD)) { |
642 | memset(child_trap_frame, 0, child_stack_sz); | |
643 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = | |
644 | (current_pt_regs()->tstate + 1) & TSTATE_CWP; | |
dff933da | 645 | t->current_ds = ASI_P; |
1918c7f5 AV |
646 | t->kregs->u_regs[UREG_G1] = sp; /* function */ |
647 | t->kregs->u_regs[UREG_G2] = arg; | |
648 | return 0; | |
1da177e4 LT |
649 | } |
650 | ||
1918c7f5 AV |
651 | parent_sf = ((struct sparc_stackf *) regs) - 1; |
652 | memcpy(child_trap_frame, parent_sf, child_stack_sz); | |
653 | if (t->flags & _TIF_32BIT) { | |
654 | sp &= 0x00000000ffffffffUL; | |
655 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
656 | } | |
657 | t->kregs->u_regs[UREG_FP] = sp; | |
658 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = | |
659 | (regs->tstate + 1) & TSTATE_CWP; | |
660 | t->current_ds = ASI_AIUS; | |
661 | if (sp != regs->u_regs[UREG_FP]) { | |
662 | unsigned long csp; | |
663 | ||
664 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
665 | if (!csp) | |
666 | return -EFAULT; | |
667 | t->kregs->u_regs[UREG_FP] = csp; | |
668 | } | |
669 | if (t->utraps) | |
670 | t->utraps[0]++; | |
671 | ||
1da177e4 LT |
672 | /* Set the return value for the child. */ |
673 | t->kregs->u_regs[UREG_I0] = current->pid; | |
674 | t->kregs->u_regs[UREG_I1] = 1; | |
675 | ||
676 | /* Set the second return value for the parent. */ | |
677 | regs->u_regs[UREG_I1] = 0; | |
678 | ||
679 | if (clone_flags & CLONE_SETTLS) | |
680 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
1da177e4 LT |
685 | typedef struct { |
686 | union { | |
687 | unsigned int pr_regs[32]; | |
688 | unsigned long pr_dregs[16]; | |
689 | } pr_fr; | |
690 | unsigned int __unused; | |
691 | unsigned int pr_fsr; | |
692 | unsigned char pr_qcnt; | |
693 | unsigned char pr_q_entrysize; | |
694 | unsigned char pr_en; | |
695 | unsigned int pr_q[64]; | |
696 | } elf_fpregset_t32; | |
697 | ||
698 | /* | |
699 | * fill in the fpu structure for a core dump. | |
700 | */ | |
701 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
702 | { | |
703 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
704 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
705 | ||
706 | if (test_thread_flag(TIF_32BIT)) { | |
707 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
708 | ||
709 | if (fprs & FPRS_DL) | |
710 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
711 | sizeof(unsigned int) * 32); | |
712 | else | |
713 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
714 | sizeof(unsigned int) * 32); | |
715 | fpregs32->pr_qcnt = 0; | |
716 | fpregs32->pr_q_entrysize = 8; | |
717 | memset(&fpregs32->pr_q[0], 0, | |
718 | (sizeof(unsigned int) * 64)); | |
719 | if (fprs & FPRS_FEF) { | |
720 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
721 | fpregs32->pr_en = 1; | |
722 | } else { | |
723 | fpregs32->pr_fsr = 0; | |
724 | fpregs32->pr_en = 0; | |
725 | } | |
726 | } else { | |
727 | if(fprs & FPRS_DL) | |
728 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
729 | sizeof(unsigned int) * 32); | |
730 | else | |
731 | memset(&fpregs->pr_regs[0], 0, | |
732 | sizeof(unsigned int) * 32); | |
733 | if(fprs & FPRS_DU) | |
734 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
735 | sizeof(unsigned int) * 32); | |
736 | else | |
737 | memset(&fpregs->pr_regs[16], 0, | |
738 | sizeof(unsigned int) * 32); | |
739 | if(fprs & FPRS_FEF) { | |
740 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
741 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
742 | } else { | |
743 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
744 | } | |
745 | fpregs->pr_fprs = fprs; | |
746 | } | |
747 | return 1; | |
748 | } | |
917c3660 | 749 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 | 750 | |
1da177e4 LT |
751 | unsigned long get_wchan(struct task_struct *task) |
752 | { | |
753 | unsigned long pc, fp, bias = 0; | |
4f70f7a9 | 754 | struct thread_info *tp; |
1da177e4 LT |
755 | struct reg_window *rw; |
756 | unsigned long ret = 0; | |
757 | int count = 0; | |
758 | ||
759 | if (!task || task == current || | |
760 | task->state == TASK_RUNNING) | |
761 | goto out; | |
762 | ||
4f70f7a9 | 763 | tp = task_thread_info(task); |
1da177e4 | 764 | bias = STACK_BIAS; |
f3169641 | 765 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
766 | |
767 | do { | |
4f70f7a9 | 768 | if (!kstack_valid(tp, fp)) |
1da177e4 LT |
769 | break; |
770 | rw = (struct reg_window *) fp; | |
771 | pc = rw->ins[7]; | |
772 | if (!in_sched_functions(pc)) { | |
773 | ret = pc; | |
774 | goto out; | |
775 | } | |
776 | fp = rw->ins[6] + bias; | |
777 | } while (++count < 16); | |
778 | ||
779 | out: | |
780 | return ret; | |
781 | } |