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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> |
68db0cf1 | 19 | #include <linux/sched/task_stack.h> |
1da177e4 | 20 | #include <linux/kernel.h> |
1da177e4 | 21 | #include <linux/mm.h> |
4e950f6f | 22 | #include <linux/fs.h> |
1da177e4 | 23 | #include <linux/smp.h> |
1da177e4 LT |
24 | #include <linux/stddef.h> |
25 | #include <linux/ptrace.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/user.h> | |
1da177e4 LT |
28 | #include <linux/delay.h> |
29 | #include <linux/compat.h> | |
038cb01e | 30 | #include <linux/tick.h> |
1da177e4 | 31 | #include <linux/init.h> |
e0204409 | 32 | #include <linux/cpu.h> |
916ca14a | 33 | #include <linux/perf_event.h> |
b1422401 | 34 | #include <linux/elfcore.h> |
93dae5b7 | 35 | #include <linux/sysrq.h> |
802c64b3 | 36 | #include <linux/nmi.h> |
812cb83a | 37 | #include <linux/context_tracking.h> |
1da177e4 | 38 | |
7c0f6ba6 | 39 | #include <linux/uaccess.h> |
1da177e4 LT |
40 | #include <asm/page.h> |
41 | #include <asm/pgalloc.h> | |
42 | #include <asm/pgtable.h> | |
43 | #include <asm/processor.h> | |
44 | #include <asm/pstate.h> | |
45 | #include <asm/elf.h> | |
46 | #include <asm/fpumacro.h> | |
47 | #include <asm/head.h> | |
48 | #include <asm/cpudata.h> | |
74bf4312 | 49 | #include <asm/mmu_context.h> |
1da177e4 | 50 | #include <asm/unistd.h> |
30c91d57 | 51 | #include <asm/hypervisor.h> |
b1422401 | 52 | #include <asm/syscalls.h> |
93dae5b7 DM |
53 | #include <asm/irq_regs.h> |
54 | #include <asm/smp.h> | |
916ca14a | 55 | #include <asm/pcr.h> |
1da177e4 | 56 | |
4f70f7a9 DM |
57 | #include "kstack.h" |
58 | ||
87fa05ae SR |
59 | /* Idle loop support on sparc64. */ |
60 | void arch_cpu_idle(void) | |
1da177e4 | 61 | { |
802c64b3 DM |
62 | if (tlb_type != hypervisor) { |
63 | touch_nmi_watchdog(); | |
cb3042d6 | 64 | local_irq_enable(); |
87fa05ae | 65 | } else { |
30c91d57 DM |
66 | unsigned long pstate; |
67 | ||
cb3042d6 DM |
68 | local_irq_enable(); |
69 | ||
87fa05ae SR |
70 | /* The sun4v sleeping code requires that we have PSTATE.IE cleared over |
71 | * the cpu sleep hypervisor call. | |
72 | */ | |
30c91d57 DM |
73 | __asm__ __volatile__( |
74 | "rdpr %%pstate, %0\n\t" | |
75 | "andn %0, %1, %0\n\t" | |
76 | "wrpr %0, %%g0, %%pstate" | |
77 | : "=&r" (pstate) | |
78 | : "i" (PSTATE_IE)); | |
79 | ||
87fa05ae | 80 | if (!need_resched() && !cpu_is_offline(smp_processor_id())) |
30c91d57 DM |
81 | sun4v_cpu_yield(); |
82 | ||
83 | /* Re-enable interrupts. */ | |
84 | __asm__ __volatile__( | |
85 | "rdpr %%pstate, %0\n\t" | |
86 | "or %0, %1, %0\n\t" | |
87 | "wrpr %0, %%g0, %%pstate" | |
88 | : "=&r" (pstate) | |
89 | : "i" (PSTATE_IE)); | |
1da177e4 | 90 | } |
30c91d57 | 91 | } |
1da177e4 | 92 | |
e0204409 | 93 | #ifdef CONFIG_HOTPLUG_CPU |
d1584504 | 94 | void arch_cpu_idle_dead(void) |
87fa05ae SR |
95 | { |
96 | sched_preempt_enable_no_resched(); | |
97 | cpu_play_dead(); | |
1da177e4 | 98 | } |
87fa05ae | 99 | #endif |
1da177e4 | 100 | |
959a85ad | 101 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
102 | static void show_regwindow32(struct pt_regs *regs) |
103 | { | |
104 | struct reg_window32 __user *rw; | |
105 | struct reg_window32 r_w; | |
106 | mm_segment_t old_fs; | |
107 | ||
108 | __asm__ __volatile__ ("flushw"); | |
9ef595d8 | 109 | rw = compat_ptr((unsigned int)regs->u_regs[14]); |
1da177e4 LT |
110 | old_fs = get_fs(); |
111 | set_fs (USER_DS); | |
112 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
113 | set_fs (old_fs); | |
114 | return; | |
115 | } | |
116 | ||
117 | set_fs (old_fs); | |
118 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
119 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
120 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
121 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
122 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
123 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
124 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
125 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
126 | } | |
959a85ad DM |
127 | #else |
128 | #define show_regwindow32(regs) do { } while (0) | |
129 | #endif | |
1da177e4 LT |
130 | |
131 | static void show_regwindow(struct pt_regs *regs) | |
132 | { | |
133 | struct reg_window __user *rw; | |
134 | struct reg_window *rwk; | |
135 | struct reg_window r_w; | |
136 | mm_segment_t old_fs; | |
137 | ||
138 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
139 | __asm__ __volatile__ ("flushw"); | |
140 | rw = (struct reg_window __user *) | |
141 | (regs->u_regs[14] + STACK_BIAS); | |
142 | rwk = (struct reg_window *) | |
143 | (regs->u_regs[14] + STACK_BIAS); | |
144 | if (!(regs->tstate & TSTATE_PRIV)) { | |
145 | old_fs = get_fs(); | |
146 | set_fs (USER_DS); | |
147 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
148 | set_fs (old_fs); | |
149 | return; | |
150 | } | |
151 | rwk = &r_w; | |
152 | set_fs (old_fs); | |
153 | } | |
154 | } else { | |
155 | show_regwindow32(regs); | |
156 | return; | |
157 | } | |
158 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
159 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
160 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
161 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
162 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
163 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
164 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
165 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
166 | if (regs->tstate & TSTATE_PRIV) | |
4fe3ebec | 167 | printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
1da177e4 LT |
168 | } |
169 | ||
dbf3e950 | 170 | void show_regs(struct pt_regs *regs) |
1da177e4 | 171 | { |
a43cb95d TH |
172 | show_regs_print_info(KERN_DEFAULT); |
173 | ||
1da177e4 LT |
174 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
175 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
4fe3ebec | 176 | printk("TPC: <%pS>\n", (void *) regs->tpc); |
1da177e4 LT |
177 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
178 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
179 | regs->u_regs[3]); | |
180 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
181 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
182 | regs->u_regs[7]); | |
183 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
184 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
185 | regs->u_regs[11]); | |
186 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
187 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
188 | regs->u_regs[15]); | |
4fe3ebec | 189 | printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
1da177e4 | 190 | show_regwindow(regs); |
87e8f0e3 | 191 | show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); |
1da177e4 LT |
192 | } |
193 | ||
916ca14a DM |
194 | union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; |
195 | static DEFINE_SPINLOCK(global_cpu_snapshot_lock); | |
93dae5b7 DM |
196 | |
197 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, | |
198 | int this_cpu) | |
199 | { | |
916ca14a DM |
200 | struct global_reg_snapshot *rp; |
201 | ||
93dae5b7 DM |
202 | flushw_all(); |
203 | ||
916ca14a DM |
204 | rp = &global_cpu_snapshot[this_cpu].reg; |
205 | ||
206 | rp->tstate = regs->tstate; | |
207 | rp->tpc = regs->tpc; | |
208 | rp->tnpc = regs->tnpc; | |
209 | rp->o7 = regs->u_regs[UREG_I7]; | |
93dae5b7 DM |
210 | |
211 | if (regs->tstate & TSTATE_PRIV) { | |
212 | struct reg_window *rw; | |
213 | ||
214 | rw = (struct reg_window *) | |
215 | (regs->u_regs[UREG_FP] + STACK_BIAS); | |
4f70f7a9 | 216 | if (kstack_valid(tp, (unsigned long) rw)) { |
916ca14a | 217 | rp->i7 = rw->ins[7]; |
5afe2738 DM |
218 | rw = (struct reg_window *) |
219 | (rw->ins[6] + STACK_BIAS); | |
4f70f7a9 | 220 | if (kstack_valid(tp, (unsigned long) rw)) |
916ca14a | 221 | rp->rpc = rw->ins[7]; |
5afe2738 DM |
222 | } |
223 | } else { | |
916ca14a DM |
224 | rp->i7 = 0; |
225 | rp->rpc = 0; | |
5afe2738 | 226 | } |
916ca14a | 227 | rp->thread = tp; |
93dae5b7 DM |
228 | } |
229 | ||
230 | /* In order to avoid hangs we do not try to synchronize with the | |
231 | * global register dump client cpus. The last store they make is to | |
232 | * the thread pointer, so do a short poll waiting for that to become | |
233 | * non-NULL. | |
234 | */ | |
235 | static void __global_reg_poll(struct global_reg_snapshot *gp) | |
236 | { | |
237 | int limit = 0; | |
238 | ||
239 | while (!gp->thread && ++limit < 100) { | |
240 | barrier(); | |
241 | udelay(1); | |
242 | } | |
243 | } | |
244 | ||
9a01c3ed | 245 | void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) |
93dae5b7 DM |
246 | { |
247 | struct thread_info *tp = current_thread_info(); | |
248 | struct pt_regs *regs = get_irq_regs(); | |
93dae5b7 DM |
249 | unsigned long flags; |
250 | int this_cpu, cpu; | |
251 | ||
252 | if (!regs) | |
253 | regs = tp->kregs; | |
254 | ||
916ca14a | 255 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); |
93dae5b7 | 256 | |
93dae5b7 DM |
257 | this_cpu = raw_smp_processor_id(); |
258 | ||
f3aca3d0 AT |
259 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
260 | ||
9a01c3ed | 261 | if (cpumask_test_cpu(this_cpu, mask) && !exclude_self) |
f3aca3d0 | 262 | __global_reg_self(tp, regs, this_cpu); |
93dae5b7 DM |
263 | |
264 | smp_fetch_global_regs(); | |
265 | ||
9a01c3ed | 266 | for_each_cpu(cpu, mask) { |
f3aca3d0 AT |
267 | struct global_reg_snapshot *gp; |
268 | ||
9a01c3ed | 269 | if (exclude_self && cpu == this_cpu) |
f3aca3d0 AT |
270 | continue; |
271 | ||
272 | gp = &global_cpu_snapshot[cpu].reg; | |
93dae5b7 DM |
273 | |
274 | __global_reg_poll(gp); | |
275 | ||
276 | tp = gp->thread; | |
277 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", | |
278 | (cpu == this_cpu ? '*' : ' '), cpu, | |
279 | gp->tstate, gp->tpc, gp->tnpc, | |
280 | ((tp && tp->task) ? tp->task->comm : "NULL"), | |
281 | ((tp && tp->task) ? tp->task->pid : -1)); | |
4fe3ebec | 282 | |
93dae5b7 | 283 | if (gp->tstate & TSTATE_PRIV) { |
5afe2738 | 284 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
4fe3ebec DM |
285 | (void *) gp->tpc, |
286 | (void *) gp->o7, | |
5afe2738 DM |
287 | (void *) gp->i7, |
288 | (void *) gp->rpc); | |
4fe3ebec | 289 | } else { |
5afe2738 DM |
290 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
291 | gp->tpc, gp->o7, gp->i7, gp->rpc); | |
93dae5b7 | 292 | } |
31aaa98c DA |
293 | |
294 | touch_nmi_watchdog(); | |
93dae5b7 DM |
295 | } |
296 | ||
916ca14a | 297 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
93dae5b7 | 298 | |
916ca14a | 299 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); |
93dae5b7 DM |
300 | } |
301 | ||
09ee167c DM |
302 | #ifdef CONFIG_MAGIC_SYSRQ |
303 | ||
1495cc9d | 304 | static void sysrq_handle_globreg(int key) |
09ee167c | 305 | { |
9a01c3ed | 306 | trigger_all_cpu_backtrace(); |
09ee167c DM |
307 | } |
308 | ||
93dae5b7 DM |
309 | static struct sysrq_key_op sparc_globalreg_op = { |
310 | .handler = sysrq_handle_globreg, | |
5452c7f8 | 311 | .help_msg = "global-regs(y)", |
93dae5b7 DM |
312 | .action_msg = "Show Global CPU Regs", |
313 | }; | |
314 | ||
916ca14a | 315 | static void __global_pmu_self(int this_cpu) |
93dae5b7 | 316 | { |
916ca14a DM |
317 | struct global_pmu_snapshot *pp; |
318 | int i, num; | |
319 | ||
8bccf5b3 DM |
320 | if (!pcr_ops) |
321 | return; | |
322 | ||
916ca14a DM |
323 | pp = &global_cpu_snapshot[this_cpu].pmu; |
324 | ||
325 | num = 1; | |
326 | if (tlb_type == hypervisor && | |
327 | sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) | |
328 | num = 4; | |
329 | ||
330 | for (i = 0; i < num; i++) { | |
331 | pp->pcr[i] = pcr_ops->read_pcr(i); | |
332 | pp->pic[i] = pcr_ops->read_pic(i); | |
333 | } | |
93dae5b7 DM |
334 | } |
335 | ||
916ca14a DM |
336 | static void __global_pmu_poll(struct global_pmu_snapshot *pp) |
337 | { | |
338 | int limit = 0; | |
339 | ||
340 | while (!pp->pcr[0] && ++limit < 100) { | |
341 | barrier(); | |
342 | udelay(1); | |
343 | } | |
344 | } | |
345 | ||
346 | static void pmu_snapshot_all_cpus(void) | |
93dae5b7 | 347 | { |
916ca14a DM |
348 | unsigned long flags; |
349 | int this_cpu, cpu; | |
350 | ||
351 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); | |
352 | ||
353 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
354 | ||
355 | this_cpu = raw_smp_processor_id(); | |
356 | ||
357 | __global_pmu_self(this_cpu); | |
358 | ||
359 | smp_fetch_global_pmu(); | |
360 | ||
361 | for_each_online_cpu(cpu) { | |
362 | struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu; | |
363 | ||
364 | __global_pmu_poll(pp); | |
365 | ||
366 | printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n", | |
367 | (cpu == this_cpu ? '*' : ' '), cpu, | |
368 | pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], | |
369 | pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]); | |
31aaa98c DA |
370 | |
371 | touch_nmi_watchdog(); | |
916ca14a DM |
372 | } |
373 | ||
374 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
375 | ||
376 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); | |
377 | } | |
378 | ||
379 | static void sysrq_handle_globpmu(int key) | |
380 | { | |
381 | pmu_snapshot_all_cpus(); | |
382 | } | |
383 | ||
384 | static struct sysrq_key_op sparc_globalpmu_op = { | |
385 | .handler = sysrq_handle_globpmu, | |
5452c7f8 | 386 | .help_msg = "global-pmu(x)", |
916ca14a DM |
387 | .action_msg = "Show Global PMU Regs", |
388 | }; | |
389 | ||
390 | static int __init sparc_sysrq_init(void) | |
391 | { | |
392 | int ret = register_sysrq_key('y', &sparc_globalreg_op); | |
393 | ||
394 | if (!ret) | |
395 | ret = register_sysrq_key('x', &sparc_globalpmu_op); | |
396 | return ret; | |
93dae5b7 DM |
397 | } |
398 | ||
916ca14a | 399 | core_initcall(sparc_sysrq_init); |
93dae5b7 DM |
400 | |
401 | #endif | |
402 | ||
1da177e4 | 403 | /* Free current thread data structures etc.. */ |
e6464694 | 404 | void exit_thread(struct task_struct *tsk) |
1da177e4 | 405 | { |
e6464694 | 406 | struct thread_info *t = task_thread_info(tsk); |
1da177e4 LT |
407 | |
408 | if (t->utraps) { | |
409 | if (t->utraps[0] < 2) | |
410 | kfree (t->utraps); | |
411 | else | |
412 | t->utraps[0]--; | |
413 | } | |
1da177e4 LT |
414 | } |
415 | ||
416 | void flush_thread(void) | |
417 | { | |
418 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 419 | struct mm_struct *mm; |
1da177e4 | 420 | |
74bf4312 DM |
421 | mm = t->task->mm; |
422 | if (mm) | |
98c5584c | 423 | tsb_context_switch(mm); |
1da177e4 | 424 | |
1da177e4 LT |
425 | set_thread_wsaved(0); |
426 | ||
1da177e4 LT |
427 | /* Clear FPU register state. */ |
428 | t->fpsaved[0] = 0; | |
1da177e4 LT |
429 | } |
430 | ||
431 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
432 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
433 | { | |
517ffce4 | 434 | bool stack_64bit = test_thread_64bit_stack(psp); |
1da177e4 LT |
435 | unsigned long fp, distance, rval; |
436 | ||
517ffce4 | 437 | if (stack_64bit) { |
1da177e4 LT |
438 | csp += STACK_BIAS; |
439 | psp += STACK_BIAS; | |
440 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
441 | fp += STACK_BIAS; | |
517ffce4 DM |
442 | if (test_thread_flag(TIF_32BIT)) |
443 | fp &= 0xffffffff; | |
1da177e4 LT |
444 | } else |
445 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
446 | ||
f036d9f3 DM |
447 | /* Now align the stack as this is mandatory in the Sparc ABI |
448 | * due to how register windows work. This hides the | |
449 | * restriction from thread libraries etc. | |
1da177e4 | 450 | */ |
f036d9f3 | 451 | csp &= ~15UL; |
1da177e4 LT |
452 | |
453 | distance = fp - psp; | |
454 | rval = (csp - distance); | |
455 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
456 | rval = 0; | |
517ffce4 | 457 | else if (!stack_64bit) { |
1da177e4 LT |
458 | if (put_user(((u32)csp), |
459 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
460 | rval = 0; | |
461 | } else { | |
462 | if (put_user(((u64)csp - STACK_BIAS), | |
463 | &(((struct reg_window __user *)rval)->ins[6]))) | |
464 | rval = 0; | |
465 | else | |
466 | rval = rval - STACK_BIAS; | |
467 | } | |
468 | ||
469 | return rval; | |
470 | } | |
471 | ||
472 | /* Standard stuff. */ | |
473 | static inline void shift_window_buffer(int first_win, int last_win, | |
474 | struct thread_info *t) | |
475 | { | |
476 | int i; | |
477 | ||
478 | for (i = first_win; i < last_win; i++) { | |
479 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
480 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
481 | sizeof(struct reg_window)); | |
482 | } | |
483 | } | |
484 | ||
485 | void synchronize_user_stack(void) | |
486 | { | |
487 | struct thread_info *t = current_thread_info(); | |
488 | unsigned long window; | |
489 | ||
490 | flush_user_windows(); | |
491 | if ((window = get_thread_wsaved()) != 0) { | |
1da177e4 LT |
492 | window -= 1; |
493 | do { | |
1da177e4 | 494 | struct reg_window *rwin = &t->reg_window[window]; |
517ffce4 DM |
495 | int winsize = sizeof(struct reg_window); |
496 | unsigned long sp; | |
497 | ||
498 | sp = t->rwbuf_stkptrs[window]; | |
499 | ||
500 | if (test_thread_64bit_stack(sp)) | |
501 | sp += STACK_BIAS; | |
502 | else | |
503 | winsize = sizeof(struct reg_window32); | |
1da177e4 LT |
504 | |
505 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
506 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
507 | set_thread_wsaved(get_thread_wsaved() - 1); | |
508 | } | |
509 | } while (window--); | |
510 | } | |
511 | } | |
512 | ||
314ef685 DM |
513 | static void stack_unaligned(unsigned long sp) |
514 | { | |
515 | siginfo_t info; | |
516 | ||
517 | info.si_signo = SIGBUS; | |
518 | info.si_errno = 0; | |
519 | info.si_code = BUS_ADRALN; | |
520 | info.si_addr = (void __user *) sp; | |
521 | info.si_trapno = 0; | |
522 | force_sig_info(SIGBUS, &info, current); | |
523 | } | |
524 | ||
1da177e4 LT |
525 | void fault_in_user_windows(void) |
526 | { | |
527 | struct thread_info *t = current_thread_info(); | |
528 | unsigned long window; | |
1da177e4 LT |
529 | |
530 | flush_user_windows(); | |
531 | window = get_thread_wsaved(); | |
532 | ||
314ef685 | 533 | if (likely(window != 0)) { |
1da177e4 LT |
534 | window -= 1; |
535 | do { | |
1da177e4 | 536 | struct reg_window *rwin = &t->reg_window[window]; |
517ffce4 DM |
537 | int winsize = sizeof(struct reg_window); |
538 | unsigned long sp; | |
539 | ||
540 | sp = t->rwbuf_stkptrs[window]; | |
541 | ||
542 | if (test_thread_64bit_stack(sp)) | |
543 | sp += STACK_BIAS; | |
544 | else | |
545 | winsize = sizeof(struct reg_window32); | |
1da177e4 | 546 | |
314ef685 DM |
547 | if (unlikely(sp & 0x7UL)) |
548 | stack_unaligned(sp); | |
549 | ||
550 | if (unlikely(copy_to_user((char __user *)sp, | |
551 | rwin, winsize))) | |
1da177e4 LT |
552 | goto barf; |
553 | } while (window--); | |
554 | } | |
555 | set_thread_wsaved(0); | |
556 | return; | |
557 | ||
558 | barf: | |
559 | set_thread_wsaved(window + 1); | |
812cb83a | 560 | user_exit(); |
1da177e4 LT |
561 | do_exit(SIGILL); |
562 | } | |
563 | ||
564 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
565 | unsigned long stack_start, | |
566 | struct pt_regs *regs, | |
567 | unsigned long stack_size) | |
568 | { | |
569 | int __user *parent_tid_ptr, *child_tid_ptr; | |
1e38c126 DM |
570 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
571 | long ret; | |
1da177e4 LT |
572 | |
573 | #ifdef CONFIG_COMPAT | |
574 | if (test_thread_flag(TIF_32BIT)) { | |
575 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
576 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
577 | } else | |
578 | #endif | |
579 | { | |
580 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
581 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
582 | } | |
583 | ||
e80d6661 | 584 | ret = do_fork(clone_flags, stack_start, stack_size, |
1e38c126 DM |
585 | parent_tid_ptr, child_tid_ptr); |
586 | ||
587 | /* If we get an error and potentially restart the system | |
588 | * call, we're screwed because copy_thread() clobbered | |
589 | * the parent's %o1. So detect that case and restore it | |
590 | * here. | |
591 | */ | |
592 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
593 | regs->u_regs[UREG_I1] = orig_i1; | |
594 | ||
595 | return ret; | |
1da177e4 LT |
596 | } |
597 | ||
598 | /* Copy a Sparc thread. The fork() return value conventions | |
599 | * under SunOS are nothing short of bletcherous: | |
600 | * Parent --> %o0 == childs pid, %o1 == 0 | |
601 | * Child --> %o0 == parents pid, %o1 == 1 | |
602 | */ | |
6f2c55b8 | 603 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
afa86fc4 | 604 | unsigned long arg, struct task_struct *p) |
1da177e4 | 605 | { |
ee3eea16 | 606 | struct thread_info *t = task_thread_info(p); |
afa86fc4 | 607 | struct pt_regs *regs = current_pt_regs(); |
a051bc5b DM |
608 | struct sparc_stackf *parent_sf; |
609 | unsigned long child_stack_sz; | |
1da177e4 | 610 | char *child_trap_frame; |
1da177e4 | 611 | |
a051bc5b | 612 | /* Calculate offset to stack_frame & pt_regs */ |
1918c7f5 | 613 | child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ); |
a051bc5b DM |
614 | child_trap_frame = (task_stack_page(p) + |
615 | (THREAD_SIZE - child_stack_sz)); | |
a051bc5b | 616 | |
db7d9a4e | 617 | t->new_child = 1; |
1da177e4 | 618 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
a051bc5b DM |
619 | t->kregs = (struct pt_regs *) (child_trap_frame + |
620 | sizeof(struct sparc_stackf)); | |
1da177e4 LT |
621 | t->fpsaved[0] = 0; |
622 | ||
1918c7f5 AV |
623 | if (unlikely(p->flags & PF_KTHREAD)) { |
624 | memset(child_trap_frame, 0, child_stack_sz); | |
625 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = | |
626 | (current_pt_regs()->tstate + 1) & TSTATE_CWP; | |
dff933da | 627 | t->current_ds = ASI_P; |
1918c7f5 AV |
628 | t->kregs->u_regs[UREG_G1] = sp; /* function */ |
629 | t->kregs->u_regs[UREG_G2] = arg; | |
630 | return 0; | |
1da177e4 LT |
631 | } |
632 | ||
1918c7f5 AV |
633 | parent_sf = ((struct sparc_stackf *) regs) - 1; |
634 | memcpy(child_trap_frame, parent_sf, child_stack_sz); | |
635 | if (t->flags & _TIF_32BIT) { | |
636 | sp &= 0x00000000ffffffffUL; | |
637 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
638 | } | |
639 | t->kregs->u_regs[UREG_FP] = sp; | |
640 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = | |
641 | (regs->tstate + 1) & TSTATE_CWP; | |
642 | t->current_ds = ASI_AIUS; | |
643 | if (sp != regs->u_regs[UREG_FP]) { | |
644 | unsigned long csp; | |
645 | ||
646 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
647 | if (!csp) | |
648 | return -EFAULT; | |
649 | t->kregs->u_regs[UREG_FP] = csp; | |
650 | } | |
651 | if (t->utraps) | |
652 | t->utraps[0]++; | |
653 | ||
1da177e4 LT |
654 | /* Set the return value for the child. */ |
655 | t->kregs->u_regs[UREG_I0] = current->pid; | |
656 | t->kregs->u_regs[UREG_I1] = 1; | |
657 | ||
658 | /* Set the second return value for the parent. */ | |
659 | regs->u_regs[UREG_I1] = 0; | |
660 | ||
661 | if (clone_flags & CLONE_SETTLS) | |
662 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
1da177e4 LT |
667 | typedef struct { |
668 | union { | |
669 | unsigned int pr_regs[32]; | |
670 | unsigned long pr_dregs[16]; | |
671 | } pr_fr; | |
672 | unsigned int __unused; | |
673 | unsigned int pr_fsr; | |
674 | unsigned char pr_qcnt; | |
675 | unsigned char pr_q_entrysize; | |
676 | unsigned char pr_en; | |
677 | unsigned int pr_q[64]; | |
678 | } elf_fpregset_t32; | |
679 | ||
680 | /* | |
681 | * fill in the fpu structure for a core dump. | |
682 | */ | |
683 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
684 | { | |
685 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
686 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
687 | ||
688 | if (test_thread_flag(TIF_32BIT)) { | |
689 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
690 | ||
691 | if (fprs & FPRS_DL) | |
692 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
693 | sizeof(unsigned int) * 32); | |
694 | else | |
695 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
696 | sizeof(unsigned int) * 32); | |
697 | fpregs32->pr_qcnt = 0; | |
698 | fpregs32->pr_q_entrysize = 8; | |
699 | memset(&fpregs32->pr_q[0], 0, | |
700 | (sizeof(unsigned int) * 64)); | |
701 | if (fprs & FPRS_FEF) { | |
702 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
703 | fpregs32->pr_en = 1; | |
704 | } else { | |
705 | fpregs32->pr_fsr = 0; | |
706 | fpregs32->pr_en = 0; | |
707 | } | |
708 | } else { | |
709 | if(fprs & FPRS_DL) | |
710 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
711 | sizeof(unsigned int) * 32); | |
712 | else | |
713 | memset(&fpregs->pr_regs[0], 0, | |
714 | sizeof(unsigned int) * 32); | |
715 | if(fprs & FPRS_DU) | |
716 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
717 | sizeof(unsigned int) * 32); | |
718 | else | |
719 | memset(&fpregs->pr_regs[16], 0, | |
720 | sizeof(unsigned int) * 32); | |
721 | if(fprs & FPRS_FEF) { | |
722 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
723 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
724 | } else { | |
725 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
726 | } | |
727 | fpregs->pr_fprs = fprs; | |
728 | } | |
729 | return 1; | |
730 | } | |
917c3660 | 731 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 | 732 | |
1da177e4 LT |
733 | unsigned long get_wchan(struct task_struct *task) |
734 | { | |
735 | unsigned long pc, fp, bias = 0; | |
4f70f7a9 | 736 | struct thread_info *tp; |
1da177e4 LT |
737 | struct reg_window *rw; |
738 | unsigned long ret = 0; | |
739 | int count = 0; | |
740 | ||
741 | if (!task || task == current || | |
742 | task->state == TASK_RUNNING) | |
743 | goto out; | |
744 | ||
4f70f7a9 | 745 | tp = task_thread_info(task); |
1da177e4 | 746 | bias = STACK_BIAS; |
f3169641 | 747 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
748 | |
749 | do { | |
4f70f7a9 | 750 | if (!kstack_valid(tp, fp)) |
1da177e4 LT |
751 | break; |
752 | rw = (struct reg_window *) fp; | |
753 | pc = rw->ins[7]; | |
754 | if (!in_sched_functions(pc)) { | |
755 | ret = pc; | |
756 | goto out; | |
757 | } | |
758 | fp = rw->ins[6] + bias; | |
759 | } while (++count < 16); | |
760 | ||
761 | out: | |
762 | return ret; | |
763 | } |