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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5526b7e4 | 2 | /* arch/sparc64/kernel/process.c |
1da177e4 | 3 | * |
93dae5b7 | 4 | * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
5 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
6 | * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This file handles the architecture-dependent parts of process handling.. | |
11 | */ | |
12 | ||
13 | #include <stdarg.h> | |
14 | ||
1da177e4 | 15 | #include <linux/errno.h> |
066bcaca | 16 | #include <linux/export.h> |
1da177e4 | 17 | #include <linux/sched.h> |
b17b0153 | 18 | #include <linux/sched/debug.h> |
29930025 | 19 | #include <linux/sched/task.h> |
68db0cf1 | 20 | #include <linux/sched/task_stack.h> |
1da177e4 | 21 | #include <linux/kernel.h> |
1da177e4 | 22 | #include <linux/mm.h> |
4e950f6f | 23 | #include <linux/fs.h> |
1da177e4 | 24 | #include <linux/smp.h> |
1da177e4 LT |
25 | #include <linux/stddef.h> |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/user.h> | |
1da177e4 LT |
29 | #include <linux/delay.h> |
30 | #include <linux/compat.h> | |
038cb01e | 31 | #include <linux/tick.h> |
1da177e4 | 32 | #include <linux/init.h> |
e0204409 | 33 | #include <linux/cpu.h> |
916ca14a | 34 | #include <linux/perf_event.h> |
b1422401 | 35 | #include <linux/elfcore.h> |
93dae5b7 | 36 | #include <linux/sysrq.h> |
802c64b3 | 37 | #include <linux/nmi.h> |
812cb83a | 38 | #include <linux/context_tracking.h> |
1da177e4 | 39 | |
7c0f6ba6 | 40 | #include <linux/uaccess.h> |
1da177e4 LT |
41 | #include <asm/page.h> |
42 | #include <asm/pgalloc.h> | |
43 | #include <asm/pgtable.h> | |
44 | #include <asm/processor.h> | |
45 | #include <asm/pstate.h> | |
46 | #include <asm/elf.h> | |
47 | #include <asm/fpumacro.h> | |
48 | #include <asm/head.h> | |
49 | #include <asm/cpudata.h> | |
74bf4312 | 50 | #include <asm/mmu_context.h> |
1da177e4 | 51 | #include <asm/unistd.h> |
30c91d57 | 52 | #include <asm/hypervisor.h> |
b1422401 | 53 | #include <asm/syscalls.h> |
93dae5b7 DM |
54 | #include <asm/irq_regs.h> |
55 | #include <asm/smp.h> | |
916ca14a | 56 | #include <asm/pcr.h> |
1da177e4 | 57 | |
4f70f7a9 DM |
58 | #include "kstack.h" |
59 | ||
87fa05ae SR |
60 | /* Idle loop support on sparc64. */ |
61 | void arch_cpu_idle(void) | |
1da177e4 | 62 | { |
802c64b3 DM |
63 | if (tlb_type != hypervisor) { |
64 | touch_nmi_watchdog(); | |
cb3042d6 | 65 | local_irq_enable(); |
87fa05ae | 66 | } else { |
30c91d57 DM |
67 | unsigned long pstate; |
68 | ||
cb3042d6 DM |
69 | local_irq_enable(); |
70 | ||
87fa05ae SR |
71 | /* The sun4v sleeping code requires that we have PSTATE.IE cleared over |
72 | * the cpu sleep hypervisor call. | |
73 | */ | |
30c91d57 DM |
74 | __asm__ __volatile__( |
75 | "rdpr %%pstate, %0\n\t" | |
76 | "andn %0, %1, %0\n\t" | |
77 | "wrpr %0, %%g0, %%pstate" | |
78 | : "=&r" (pstate) | |
79 | : "i" (PSTATE_IE)); | |
80 | ||
8536e02e | 81 | if (!need_resched() && !cpu_is_offline(smp_processor_id())) { |
30c91d57 | 82 | sun4v_cpu_yield(); |
8536e02e VK |
83 | /* If resumed by cpu_poke then we need to explicitly |
84 | * call scheduler_ipi(). | |
85 | */ | |
86 | scheduler_poke(); | |
87 | } | |
30c91d57 DM |
88 | |
89 | /* Re-enable interrupts. */ | |
90 | __asm__ __volatile__( | |
91 | "rdpr %%pstate, %0\n\t" | |
92 | "or %0, %1, %0\n\t" | |
93 | "wrpr %0, %%g0, %%pstate" | |
94 | : "=&r" (pstate) | |
95 | : "i" (PSTATE_IE)); | |
1da177e4 | 96 | } |
30c91d57 | 97 | } |
1da177e4 | 98 | |
e0204409 | 99 | #ifdef CONFIG_HOTPLUG_CPU |
d1584504 | 100 | void arch_cpu_idle_dead(void) |
87fa05ae SR |
101 | { |
102 | sched_preempt_enable_no_resched(); | |
103 | cpu_play_dead(); | |
1da177e4 | 104 | } |
87fa05ae | 105 | #endif |
1da177e4 | 106 | |
959a85ad | 107 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
108 | static void show_regwindow32(struct pt_regs *regs) |
109 | { | |
110 | struct reg_window32 __user *rw; | |
111 | struct reg_window32 r_w; | |
112 | mm_segment_t old_fs; | |
113 | ||
114 | __asm__ __volatile__ ("flushw"); | |
9ef595d8 | 115 | rw = compat_ptr((unsigned int)regs->u_regs[14]); |
1da177e4 LT |
116 | old_fs = get_fs(); |
117 | set_fs (USER_DS); | |
118 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
119 | set_fs (old_fs); | |
120 | return; | |
121 | } | |
122 | ||
123 | set_fs (old_fs); | |
124 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
125 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
126 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
127 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
128 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
129 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
130 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
131 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
132 | } | |
959a85ad DM |
133 | #else |
134 | #define show_regwindow32(regs) do { } while (0) | |
135 | #endif | |
1da177e4 LT |
136 | |
137 | static void show_regwindow(struct pt_regs *regs) | |
138 | { | |
139 | struct reg_window __user *rw; | |
140 | struct reg_window *rwk; | |
141 | struct reg_window r_w; | |
142 | mm_segment_t old_fs; | |
143 | ||
144 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
145 | __asm__ __volatile__ ("flushw"); | |
146 | rw = (struct reg_window __user *) | |
147 | (regs->u_regs[14] + STACK_BIAS); | |
148 | rwk = (struct reg_window *) | |
149 | (regs->u_regs[14] + STACK_BIAS); | |
150 | if (!(regs->tstate & TSTATE_PRIV)) { | |
151 | old_fs = get_fs(); | |
152 | set_fs (USER_DS); | |
153 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
154 | set_fs (old_fs); | |
155 | return; | |
156 | } | |
157 | rwk = &r_w; | |
158 | set_fs (old_fs); | |
159 | } | |
160 | } else { | |
161 | show_regwindow32(regs); | |
162 | return; | |
163 | } | |
164 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
165 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
166 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
167 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
168 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
169 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
170 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
171 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
172 | if (regs->tstate & TSTATE_PRIV) | |
4fe3ebec | 173 | printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
1da177e4 LT |
174 | } |
175 | ||
dbf3e950 | 176 | void show_regs(struct pt_regs *regs) |
1da177e4 | 177 | { |
a43cb95d TH |
178 | show_regs_print_info(KERN_DEFAULT); |
179 | ||
1da177e4 LT |
180 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
181 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
4fe3ebec | 182 | printk("TPC: <%pS>\n", (void *) regs->tpc); |
1da177e4 LT |
183 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
184 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
185 | regs->u_regs[3]); | |
186 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
187 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
188 | regs->u_regs[7]); | |
189 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
190 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
191 | regs->u_regs[11]); | |
192 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
193 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
194 | regs->u_regs[15]); | |
4fe3ebec | 195 | printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
1da177e4 | 196 | show_regwindow(regs); |
87e8f0e3 | 197 | show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); |
1da177e4 LT |
198 | } |
199 | ||
916ca14a DM |
200 | union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; |
201 | static DEFINE_SPINLOCK(global_cpu_snapshot_lock); | |
93dae5b7 DM |
202 | |
203 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, | |
204 | int this_cpu) | |
205 | { | |
916ca14a DM |
206 | struct global_reg_snapshot *rp; |
207 | ||
93dae5b7 DM |
208 | flushw_all(); |
209 | ||
916ca14a DM |
210 | rp = &global_cpu_snapshot[this_cpu].reg; |
211 | ||
212 | rp->tstate = regs->tstate; | |
213 | rp->tpc = regs->tpc; | |
214 | rp->tnpc = regs->tnpc; | |
215 | rp->o7 = regs->u_regs[UREG_I7]; | |
93dae5b7 DM |
216 | |
217 | if (regs->tstate & TSTATE_PRIV) { | |
218 | struct reg_window *rw; | |
219 | ||
220 | rw = (struct reg_window *) | |
221 | (regs->u_regs[UREG_FP] + STACK_BIAS); | |
4f70f7a9 | 222 | if (kstack_valid(tp, (unsigned long) rw)) { |
916ca14a | 223 | rp->i7 = rw->ins[7]; |
5afe2738 DM |
224 | rw = (struct reg_window *) |
225 | (rw->ins[6] + STACK_BIAS); | |
4f70f7a9 | 226 | if (kstack_valid(tp, (unsigned long) rw)) |
916ca14a | 227 | rp->rpc = rw->ins[7]; |
5afe2738 DM |
228 | } |
229 | } else { | |
916ca14a DM |
230 | rp->i7 = 0; |
231 | rp->rpc = 0; | |
5afe2738 | 232 | } |
916ca14a | 233 | rp->thread = tp; |
93dae5b7 DM |
234 | } |
235 | ||
236 | /* In order to avoid hangs we do not try to synchronize with the | |
237 | * global register dump client cpus. The last store they make is to | |
238 | * the thread pointer, so do a short poll waiting for that to become | |
239 | * non-NULL. | |
240 | */ | |
241 | static void __global_reg_poll(struct global_reg_snapshot *gp) | |
242 | { | |
243 | int limit = 0; | |
244 | ||
245 | while (!gp->thread && ++limit < 100) { | |
246 | barrier(); | |
247 | udelay(1); | |
248 | } | |
249 | } | |
250 | ||
9a01c3ed | 251 | void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) |
93dae5b7 DM |
252 | { |
253 | struct thread_info *tp = current_thread_info(); | |
254 | struct pt_regs *regs = get_irq_regs(); | |
93dae5b7 DM |
255 | unsigned long flags; |
256 | int this_cpu, cpu; | |
257 | ||
258 | if (!regs) | |
259 | regs = tp->kregs; | |
260 | ||
916ca14a | 261 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); |
93dae5b7 | 262 | |
93dae5b7 DM |
263 | this_cpu = raw_smp_processor_id(); |
264 | ||
f3aca3d0 AT |
265 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
266 | ||
9a01c3ed | 267 | if (cpumask_test_cpu(this_cpu, mask) && !exclude_self) |
f3aca3d0 | 268 | __global_reg_self(tp, regs, this_cpu); |
93dae5b7 DM |
269 | |
270 | smp_fetch_global_regs(); | |
271 | ||
9a01c3ed | 272 | for_each_cpu(cpu, mask) { |
f3aca3d0 AT |
273 | struct global_reg_snapshot *gp; |
274 | ||
9a01c3ed | 275 | if (exclude_self && cpu == this_cpu) |
f3aca3d0 AT |
276 | continue; |
277 | ||
278 | gp = &global_cpu_snapshot[cpu].reg; | |
93dae5b7 DM |
279 | |
280 | __global_reg_poll(gp); | |
281 | ||
282 | tp = gp->thread; | |
283 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", | |
284 | (cpu == this_cpu ? '*' : ' '), cpu, | |
285 | gp->tstate, gp->tpc, gp->tnpc, | |
286 | ((tp && tp->task) ? tp->task->comm : "NULL"), | |
287 | ((tp && tp->task) ? tp->task->pid : -1)); | |
4fe3ebec | 288 | |
93dae5b7 | 289 | if (gp->tstate & TSTATE_PRIV) { |
5afe2738 | 290 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
4fe3ebec DM |
291 | (void *) gp->tpc, |
292 | (void *) gp->o7, | |
5afe2738 DM |
293 | (void *) gp->i7, |
294 | (void *) gp->rpc); | |
4fe3ebec | 295 | } else { |
5afe2738 DM |
296 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
297 | gp->tpc, gp->o7, gp->i7, gp->rpc); | |
93dae5b7 | 298 | } |
31aaa98c DA |
299 | |
300 | touch_nmi_watchdog(); | |
93dae5b7 DM |
301 | } |
302 | ||
916ca14a | 303 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
93dae5b7 | 304 | |
916ca14a | 305 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); |
93dae5b7 DM |
306 | } |
307 | ||
09ee167c DM |
308 | #ifdef CONFIG_MAGIC_SYSRQ |
309 | ||
1495cc9d | 310 | static void sysrq_handle_globreg(int key) |
09ee167c | 311 | { |
9a01c3ed | 312 | trigger_all_cpu_backtrace(); |
09ee167c DM |
313 | } |
314 | ||
93dae5b7 DM |
315 | static struct sysrq_key_op sparc_globalreg_op = { |
316 | .handler = sysrq_handle_globreg, | |
5452c7f8 | 317 | .help_msg = "global-regs(y)", |
93dae5b7 DM |
318 | .action_msg = "Show Global CPU Regs", |
319 | }; | |
320 | ||
916ca14a | 321 | static void __global_pmu_self(int this_cpu) |
93dae5b7 | 322 | { |
916ca14a DM |
323 | struct global_pmu_snapshot *pp; |
324 | int i, num; | |
325 | ||
8bccf5b3 DM |
326 | if (!pcr_ops) |
327 | return; | |
328 | ||
916ca14a DM |
329 | pp = &global_cpu_snapshot[this_cpu].pmu; |
330 | ||
331 | num = 1; | |
332 | if (tlb_type == hypervisor && | |
333 | sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) | |
334 | num = 4; | |
335 | ||
336 | for (i = 0; i < num; i++) { | |
337 | pp->pcr[i] = pcr_ops->read_pcr(i); | |
338 | pp->pic[i] = pcr_ops->read_pic(i); | |
339 | } | |
93dae5b7 DM |
340 | } |
341 | ||
916ca14a DM |
342 | static void __global_pmu_poll(struct global_pmu_snapshot *pp) |
343 | { | |
344 | int limit = 0; | |
345 | ||
346 | while (!pp->pcr[0] && ++limit < 100) { | |
347 | barrier(); | |
348 | udelay(1); | |
349 | } | |
350 | } | |
351 | ||
352 | static void pmu_snapshot_all_cpus(void) | |
93dae5b7 | 353 | { |
916ca14a DM |
354 | unsigned long flags; |
355 | int this_cpu, cpu; | |
356 | ||
357 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); | |
358 | ||
359 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
360 | ||
361 | this_cpu = raw_smp_processor_id(); | |
362 | ||
363 | __global_pmu_self(this_cpu); | |
364 | ||
365 | smp_fetch_global_pmu(); | |
366 | ||
367 | for_each_online_cpu(cpu) { | |
368 | struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu; | |
369 | ||
370 | __global_pmu_poll(pp); | |
371 | ||
372 | printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n", | |
373 | (cpu == this_cpu ? '*' : ' '), cpu, | |
374 | pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], | |
375 | pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]); | |
31aaa98c DA |
376 | |
377 | touch_nmi_watchdog(); | |
916ca14a DM |
378 | } |
379 | ||
380 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
381 | ||
382 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); | |
383 | } | |
384 | ||
385 | static void sysrq_handle_globpmu(int key) | |
386 | { | |
387 | pmu_snapshot_all_cpus(); | |
388 | } | |
389 | ||
390 | static struct sysrq_key_op sparc_globalpmu_op = { | |
391 | .handler = sysrq_handle_globpmu, | |
5452c7f8 | 392 | .help_msg = "global-pmu(x)", |
916ca14a DM |
393 | .action_msg = "Show Global PMU Regs", |
394 | }; | |
395 | ||
396 | static int __init sparc_sysrq_init(void) | |
397 | { | |
398 | int ret = register_sysrq_key('y', &sparc_globalreg_op); | |
399 | ||
400 | if (!ret) | |
401 | ret = register_sysrq_key('x', &sparc_globalpmu_op); | |
402 | return ret; | |
93dae5b7 DM |
403 | } |
404 | ||
916ca14a | 405 | core_initcall(sparc_sysrq_init); |
93dae5b7 DM |
406 | |
407 | #endif | |
408 | ||
1da177e4 | 409 | /* Free current thread data structures etc.. */ |
e6464694 | 410 | void exit_thread(struct task_struct *tsk) |
1da177e4 | 411 | { |
e6464694 | 412 | struct thread_info *t = task_thread_info(tsk); |
1da177e4 LT |
413 | |
414 | if (t->utraps) { | |
415 | if (t->utraps[0] < 2) | |
416 | kfree (t->utraps); | |
417 | else | |
418 | t->utraps[0]--; | |
419 | } | |
1da177e4 LT |
420 | } |
421 | ||
422 | void flush_thread(void) | |
423 | { | |
424 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 425 | struct mm_struct *mm; |
1da177e4 | 426 | |
74bf4312 DM |
427 | mm = t->task->mm; |
428 | if (mm) | |
98c5584c | 429 | tsb_context_switch(mm); |
1da177e4 | 430 | |
1da177e4 LT |
431 | set_thread_wsaved(0); |
432 | ||
1da177e4 LT |
433 | /* Clear FPU register state. */ |
434 | t->fpsaved[0] = 0; | |
1da177e4 LT |
435 | } |
436 | ||
437 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
438 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
439 | { | |
517ffce4 | 440 | bool stack_64bit = test_thread_64bit_stack(psp); |
1da177e4 LT |
441 | unsigned long fp, distance, rval; |
442 | ||
517ffce4 | 443 | if (stack_64bit) { |
1da177e4 LT |
444 | csp += STACK_BIAS; |
445 | psp += STACK_BIAS; | |
446 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
447 | fp += STACK_BIAS; | |
517ffce4 DM |
448 | if (test_thread_flag(TIF_32BIT)) |
449 | fp &= 0xffffffff; | |
1da177e4 LT |
450 | } else |
451 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); | |
452 | ||
f036d9f3 DM |
453 | /* Now align the stack as this is mandatory in the Sparc ABI |
454 | * due to how register windows work. This hides the | |
455 | * restriction from thread libraries etc. | |
1da177e4 | 456 | */ |
f036d9f3 | 457 | csp &= ~15UL; |
1da177e4 LT |
458 | |
459 | distance = fp - psp; | |
460 | rval = (csp - distance); | |
461 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) | |
462 | rval = 0; | |
517ffce4 | 463 | else if (!stack_64bit) { |
1da177e4 LT |
464 | if (put_user(((u32)csp), |
465 | &(((struct reg_window32 __user *)rval)->ins[6]))) | |
466 | rval = 0; | |
467 | } else { | |
468 | if (put_user(((u64)csp - STACK_BIAS), | |
469 | &(((struct reg_window __user *)rval)->ins[6]))) | |
470 | rval = 0; | |
471 | else | |
472 | rval = rval - STACK_BIAS; | |
473 | } | |
474 | ||
475 | return rval; | |
476 | } | |
477 | ||
478 | /* Standard stuff. */ | |
479 | static inline void shift_window_buffer(int first_win, int last_win, | |
480 | struct thread_info *t) | |
481 | { | |
482 | int i; | |
483 | ||
484 | for (i = first_win; i < last_win; i++) { | |
485 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; | |
486 | memcpy(&t->reg_window[i], &t->reg_window[i+1], | |
487 | sizeof(struct reg_window)); | |
488 | } | |
489 | } | |
490 | ||
491 | void synchronize_user_stack(void) | |
492 | { | |
493 | struct thread_info *t = current_thread_info(); | |
494 | unsigned long window; | |
495 | ||
496 | flush_user_windows(); | |
497 | if ((window = get_thread_wsaved()) != 0) { | |
1da177e4 LT |
498 | window -= 1; |
499 | do { | |
1da177e4 | 500 | struct reg_window *rwin = &t->reg_window[window]; |
517ffce4 DM |
501 | int winsize = sizeof(struct reg_window); |
502 | unsigned long sp; | |
503 | ||
504 | sp = t->rwbuf_stkptrs[window]; | |
505 | ||
506 | if (test_thread_64bit_stack(sp)) | |
507 | sp += STACK_BIAS; | |
508 | else | |
509 | winsize = sizeof(struct reg_window32); | |
1da177e4 LT |
510 | |
511 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { | |
512 | shift_window_buffer(window, get_thread_wsaved() - 1, t); | |
513 | set_thread_wsaved(get_thread_wsaved() - 1); | |
514 | } | |
515 | } while (window--); | |
516 | } | |
517 | } | |
518 | ||
314ef685 DM |
519 | static void stack_unaligned(unsigned long sp) |
520 | { | |
521 | siginfo_t info; | |
522 | ||
523 | info.si_signo = SIGBUS; | |
524 | info.si_errno = 0; | |
525 | info.si_code = BUS_ADRALN; | |
526 | info.si_addr = (void __user *) sp; | |
527 | info.si_trapno = 0; | |
528 | force_sig_info(SIGBUS, &info, current); | |
529 | } | |
530 | ||
1da177e4 LT |
531 | void fault_in_user_windows(void) |
532 | { | |
533 | struct thread_info *t = current_thread_info(); | |
534 | unsigned long window; | |
1da177e4 LT |
535 | |
536 | flush_user_windows(); | |
537 | window = get_thread_wsaved(); | |
538 | ||
314ef685 | 539 | if (likely(window != 0)) { |
1da177e4 LT |
540 | window -= 1; |
541 | do { | |
1da177e4 | 542 | struct reg_window *rwin = &t->reg_window[window]; |
517ffce4 DM |
543 | int winsize = sizeof(struct reg_window); |
544 | unsigned long sp; | |
545 | ||
546 | sp = t->rwbuf_stkptrs[window]; | |
547 | ||
548 | if (test_thread_64bit_stack(sp)) | |
549 | sp += STACK_BIAS; | |
550 | else | |
551 | winsize = sizeof(struct reg_window32); | |
1da177e4 | 552 | |
314ef685 DM |
553 | if (unlikely(sp & 0x7UL)) |
554 | stack_unaligned(sp); | |
555 | ||
556 | if (unlikely(copy_to_user((char __user *)sp, | |
557 | rwin, winsize))) | |
1da177e4 LT |
558 | goto barf; |
559 | } while (window--); | |
560 | } | |
561 | set_thread_wsaved(0); | |
562 | return; | |
563 | ||
564 | barf: | |
565 | set_thread_wsaved(window + 1); | |
812cb83a | 566 | user_exit(); |
1da177e4 LT |
567 | do_exit(SIGILL); |
568 | } | |
569 | ||
570 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
571 | unsigned long stack_start, | |
572 | struct pt_regs *regs, | |
573 | unsigned long stack_size) | |
574 | { | |
575 | int __user *parent_tid_ptr, *child_tid_ptr; | |
1e38c126 DM |
576 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
577 | long ret; | |
1da177e4 LT |
578 | |
579 | #ifdef CONFIG_COMPAT | |
580 | if (test_thread_flag(TIF_32BIT)) { | |
581 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
582 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
583 | } else | |
584 | #endif | |
585 | { | |
586 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
587 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
588 | } | |
589 | ||
e80d6661 | 590 | ret = do_fork(clone_flags, stack_start, stack_size, |
1e38c126 DM |
591 | parent_tid_ptr, child_tid_ptr); |
592 | ||
593 | /* If we get an error and potentially restart the system | |
594 | * call, we're screwed because copy_thread() clobbered | |
595 | * the parent's %o1. So detect that case and restore it | |
596 | * here. | |
597 | */ | |
598 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
599 | regs->u_regs[UREG_I1] = orig_i1; | |
600 | ||
601 | return ret; | |
1da177e4 LT |
602 | } |
603 | ||
604 | /* Copy a Sparc thread. The fork() return value conventions | |
605 | * under SunOS are nothing short of bletcherous: | |
606 | * Parent --> %o0 == childs pid, %o1 == 0 | |
607 | * Child --> %o0 == parents pid, %o1 == 1 | |
608 | */ | |
6f2c55b8 | 609 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
afa86fc4 | 610 | unsigned long arg, struct task_struct *p) |
1da177e4 | 611 | { |
ee3eea16 | 612 | struct thread_info *t = task_thread_info(p); |
afa86fc4 | 613 | struct pt_regs *regs = current_pt_regs(); |
a051bc5b DM |
614 | struct sparc_stackf *parent_sf; |
615 | unsigned long child_stack_sz; | |
1da177e4 | 616 | char *child_trap_frame; |
1da177e4 | 617 | |
a051bc5b | 618 | /* Calculate offset to stack_frame & pt_regs */ |
1918c7f5 | 619 | child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ); |
a051bc5b DM |
620 | child_trap_frame = (task_stack_page(p) + |
621 | (THREAD_SIZE - child_stack_sz)); | |
a051bc5b | 622 | |
db7d9a4e | 623 | t->new_child = 1; |
1da177e4 | 624 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
a051bc5b DM |
625 | t->kregs = (struct pt_regs *) (child_trap_frame + |
626 | sizeof(struct sparc_stackf)); | |
1da177e4 LT |
627 | t->fpsaved[0] = 0; |
628 | ||
1918c7f5 AV |
629 | if (unlikely(p->flags & PF_KTHREAD)) { |
630 | memset(child_trap_frame, 0, child_stack_sz); | |
631 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = | |
632 | (current_pt_regs()->tstate + 1) & TSTATE_CWP; | |
dff933da | 633 | t->current_ds = ASI_P; |
1918c7f5 AV |
634 | t->kregs->u_regs[UREG_G1] = sp; /* function */ |
635 | t->kregs->u_regs[UREG_G2] = arg; | |
636 | return 0; | |
1da177e4 LT |
637 | } |
638 | ||
1918c7f5 AV |
639 | parent_sf = ((struct sparc_stackf *) regs) - 1; |
640 | memcpy(child_trap_frame, parent_sf, child_stack_sz); | |
641 | if (t->flags & _TIF_32BIT) { | |
642 | sp &= 0x00000000ffffffffUL; | |
643 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
644 | } | |
645 | t->kregs->u_regs[UREG_FP] = sp; | |
646 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = | |
647 | (regs->tstate + 1) & TSTATE_CWP; | |
648 | t->current_ds = ASI_AIUS; | |
649 | if (sp != regs->u_regs[UREG_FP]) { | |
650 | unsigned long csp; | |
651 | ||
652 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
653 | if (!csp) | |
654 | return -EFAULT; | |
655 | t->kregs->u_regs[UREG_FP] = csp; | |
656 | } | |
657 | if (t->utraps) | |
658 | t->utraps[0]++; | |
659 | ||
1da177e4 LT |
660 | /* Set the return value for the child. */ |
661 | t->kregs->u_regs[UREG_I0] = current->pid; | |
662 | t->kregs->u_regs[UREG_I1] = 1; | |
663 | ||
664 | /* Set the second return value for the parent. */ | |
665 | regs->u_regs[UREG_I1] = 0; | |
666 | ||
667 | if (clone_flags & CLONE_SETTLS) | |
668 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
1da177e4 LT |
673 | typedef struct { |
674 | union { | |
675 | unsigned int pr_regs[32]; | |
676 | unsigned long pr_dregs[16]; | |
677 | } pr_fr; | |
678 | unsigned int __unused; | |
679 | unsigned int pr_fsr; | |
680 | unsigned char pr_qcnt; | |
681 | unsigned char pr_q_entrysize; | |
682 | unsigned char pr_en; | |
683 | unsigned int pr_q[64]; | |
684 | } elf_fpregset_t32; | |
685 | ||
686 | /* | |
687 | * fill in the fpu structure for a core dump. | |
688 | */ | |
689 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
690 | { | |
691 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
692 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
693 | ||
694 | if (test_thread_flag(TIF_32BIT)) { | |
695 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
696 | ||
697 | if (fprs & FPRS_DL) | |
698 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
699 | sizeof(unsigned int) * 32); | |
700 | else | |
701 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
702 | sizeof(unsigned int) * 32); | |
703 | fpregs32->pr_qcnt = 0; | |
704 | fpregs32->pr_q_entrysize = 8; | |
705 | memset(&fpregs32->pr_q[0], 0, | |
706 | (sizeof(unsigned int) * 64)); | |
707 | if (fprs & FPRS_FEF) { | |
708 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
709 | fpregs32->pr_en = 1; | |
710 | } else { | |
711 | fpregs32->pr_fsr = 0; | |
712 | fpregs32->pr_en = 0; | |
713 | } | |
714 | } else { | |
715 | if(fprs & FPRS_DL) | |
716 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
717 | sizeof(unsigned int) * 32); | |
718 | else | |
719 | memset(&fpregs->pr_regs[0], 0, | |
720 | sizeof(unsigned int) * 32); | |
721 | if(fprs & FPRS_DU) | |
722 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
723 | sizeof(unsigned int) * 32); | |
724 | else | |
725 | memset(&fpregs->pr_regs[16], 0, | |
726 | sizeof(unsigned int) * 32); | |
727 | if(fprs & FPRS_FEF) { | |
728 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
729 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
730 | } else { | |
731 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
732 | } | |
733 | fpregs->pr_fprs = fprs; | |
734 | } | |
735 | return 1; | |
736 | } | |
917c3660 | 737 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 | 738 | |
1da177e4 LT |
739 | unsigned long get_wchan(struct task_struct *task) |
740 | { | |
741 | unsigned long pc, fp, bias = 0; | |
4f70f7a9 | 742 | struct thread_info *tp; |
1da177e4 LT |
743 | struct reg_window *rw; |
744 | unsigned long ret = 0; | |
745 | int count = 0; | |
746 | ||
747 | if (!task || task == current || | |
748 | task->state == TASK_RUNNING) | |
749 | goto out; | |
750 | ||
4f70f7a9 | 751 | tp = task_thread_info(task); |
1da177e4 | 752 | bias = STACK_BIAS; |
f3169641 | 753 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
754 | |
755 | do { | |
4f70f7a9 | 756 | if (!kstack_valid(tp, fp)) |
1da177e4 LT |
757 | break; |
758 | rw = (struct reg_window *) fp; | |
759 | pc = rw->ins[7]; | |
760 | if (!in_sched_functions(pc)) { | |
761 | ret = pc; | |
762 | goto out; | |
763 | } | |
764 | fp = rw->ins[6] + bias; | |
765 | } while (++count < 16); | |
766 | ||
767 | out: | |
768 | return ret; | |
769 | } |