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