Commit | Line | Data |
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5526b7e4 | 1 | /* arch/sparc64/kernel/process.c |
1da177e4 | 2 | * |
93dae5b7 | 3 | * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
5 | * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | */ | |
7 | ||
8 | /* | |
9 | * This file handles the architecture-dependent parts of process handling.. | |
10 | */ | |
11 | ||
12 | #include <stdarg.h> | |
13 | ||
1da177e4 | 14 | #include <linux/errno.h> |
066bcaca | 15 | #include <linux/export.h> |
1da177e4 LT |
16 | #include <linux/sched.h> |
17 | #include <linux/kernel.h> | |
1da177e4 | 18 | #include <linux/mm.h> |
4e950f6f | 19 | #include <linux/fs.h> |
1da177e4 | 20 | #include <linux/smp.h> |
1da177e4 LT |
21 | #include <linux/stddef.h> |
22 | #include <linux/ptrace.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/user.h> | |
1da177e4 LT |
25 | #include <linux/delay.h> |
26 | #include <linux/compat.h> | |
038cb01e | 27 | #include <linux/tick.h> |
1da177e4 | 28 | #include <linux/init.h> |
e0204409 | 29 | #include <linux/cpu.h> |
916ca14a | 30 | #include <linux/perf_event.h> |
b1422401 | 31 | #include <linux/elfcore.h> |
93dae5b7 | 32 | #include <linux/sysrq.h> |
802c64b3 | 33 | #include <linux/nmi.h> |
1da177e4 | 34 | |
1da177e4 | 35 | #include <asm/uaccess.h> |
1da177e4 LT |
36 | #include <asm/page.h> |
37 | #include <asm/pgalloc.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/processor.h> | |
40 | #include <asm/pstate.h> | |
41 | #include <asm/elf.h> | |
42 | #include <asm/fpumacro.h> | |
43 | #include <asm/head.h> | |
44 | #include <asm/cpudata.h> | |
74bf4312 | 45 | #include <asm/mmu_context.h> |
1da177e4 | 46 | #include <asm/unistd.h> |
30c91d57 | 47 | #include <asm/hypervisor.h> |
b1422401 | 48 | #include <asm/syscalls.h> |
93dae5b7 DM |
49 | #include <asm/irq_regs.h> |
50 | #include <asm/smp.h> | |
916ca14a | 51 | #include <asm/pcr.h> |
1da177e4 | 52 | |
4f70f7a9 DM |
53 | #include "kstack.h" |
54 | ||
e0204409 | 55 | static void sparc64_yield(int cpu) |
1da177e4 | 56 | { |
802c64b3 DM |
57 | if (tlb_type != hypervisor) { |
58 | touch_nmi_watchdog(); | |
30c91d57 | 59 | return; |
802c64b3 | 60 | } |
30c91d57 DM |
61 | |
62 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
63 | smp_mb__after_clear_bit(); | |
64 | ||
e0204409 | 65 | while (!need_resched() && !cpu_is_offline(cpu)) { |
30c91d57 DM |
66 | unsigned long pstate; |
67 | ||
68 | /* Disable interrupts. */ | |
69 | __asm__ __volatile__( | |
70 | "rdpr %%pstate, %0\n\t" | |
71 | "andn %0, %1, %0\n\t" | |
72 | "wrpr %0, %%g0, %%pstate" | |
73 | : "=&r" (pstate) | |
74 | : "i" (PSTATE_IE)); | |
75 | ||
e0204409 | 76 | if (!need_resched() && !cpu_is_offline(cpu)) |
30c91d57 DM |
77 | sun4v_cpu_yield(); |
78 | ||
79 | /* Re-enable interrupts. */ | |
80 | __asm__ __volatile__( | |
81 | "rdpr %%pstate, %0\n\t" | |
82 | "or %0, %1, %0\n\t" | |
83 | "wrpr %0, %%g0, %%pstate" | |
84 | : "=&r" (pstate) | |
85 | : "i" (PSTATE_IE)); | |
1da177e4 | 86 | } |
1da177e4 | 87 | |
30c91d57 DM |
88 | set_thread_flag(TIF_POLLING_NRFLAG); |
89 | } | |
1da177e4 | 90 | |
30c91d57 | 91 | /* The idle loop on sparc64. */ |
1da177e4 LT |
92 | void cpu_idle(void) |
93 | { | |
e0204409 DM |
94 | int cpu = smp_processor_id(); |
95 | ||
1da177e4 | 96 | set_thread_flag(TIF_POLLING_NRFLAG); |
64c7c8f8 | 97 | |
1da177e4 | 98 | while(1) { |
1268fbc7 FW |
99 | tick_nohz_idle_enter(); |
100 | rcu_idle_enter(); | |
e0204409 DM |
101 | |
102 | while (!need_resched() && !cpu_is_offline(cpu)) | |
103 | sparc64_yield(cpu); | |
104 | ||
1268fbc7 FW |
105 | rcu_idle_exit(); |
106 | tick_nohz_idle_exit(); | |
038cb01e | 107 | |
e0204409 | 108 | #ifdef CONFIG_HOTPLUG_CPU |
bd2f5536 | 109 | if (cpu_is_offline(cpu)) { |
ba74c144 | 110 | sched_preempt_enable_no_resched(); |
e0204409 | 111 | cpu_play_dead(); |
bd2f5536 | 112 | } |
e0204409 | 113 | #endif |
bd2f5536 | 114 | schedule_preempt_disabled(); |
1da177e4 LT |
115 | } |
116 | } | |
117 | ||
959a85ad | 118 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
119 | static void show_regwindow32(struct pt_regs *regs) |
120 | { | |
121 | struct reg_window32 __user *rw; | |
122 | struct reg_window32 r_w; | |
123 | mm_segment_t old_fs; | |
124 | ||
125 | __asm__ __volatile__ ("flushw"); | |
126 | rw = compat_ptr((unsigned)regs->u_regs[14]); | |
127 | old_fs = get_fs(); | |
128 | set_fs (USER_DS); | |
129 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
130 | set_fs (old_fs); | |
131 | return; | |
132 | } | |
133 | ||
134 | set_fs (old_fs); | |
135 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " | |
136 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", | |
137 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], | |
138 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); | |
139 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " | |
140 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", | |
141 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], | |
142 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); | |
143 | } | |
959a85ad DM |
144 | #else |
145 | #define show_regwindow32(regs) do { } while (0) | |
146 | #endif | |
1da177e4 LT |
147 | |
148 | static void show_regwindow(struct pt_regs *regs) | |
149 | { | |
150 | struct reg_window __user *rw; | |
151 | struct reg_window *rwk; | |
152 | struct reg_window r_w; | |
153 | mm_segment_t old_fs; | |
154 | ||
155 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { | |
156 | __asm__ __volatile__ ("flushw"); | |
157 | rw = (struct reg_window __user *) | |
158 | (regs->u_regs[14] + STACK_BIAS); | |
159 | rwk = (struct reg_window *) | |
160 | (regs->u_regs[14] + STACK_BIAS); | |
161 | if (!(regs->tstate & TSTATE_PRIV)) { | |
162 | old_fs = get_fs(); | |
163 | set_fs (USER_DS); | |
164 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { | |
165 | set_fs (old_fs); | |
166 | return; | |
167 | } | |
168 | rwk = &r_w; | |
169 | set_fs (old_fs); | |
170 | } | |
171 | } else { | |
172 | show_regwindow32(regs); | |
173 | return; | |
174 | } | |
175 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", | |
176 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); | |
177 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", | |
178 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); | |
179 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", | |
180 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); | |
181 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", | |
182 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); | |
183 | if (regs->tstate & TSTATE_PRIV) | |
4fe3ebec | 184 | printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
1da177e4 LT |
185 | } |
186 | ||
dbf3e950 | 187 | void show_regs(struct pt_regs *regs) |
1da177e4 | 188 | { |
1da177e4 LT |
189 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
190 | regs->tpc, regs->tnpc, regs->y, print_tainted()); | |
4fe3ebec | 191 | printk("TPC: <%pS>\n", (void *) regs->tpc); |
1da177e4 LT |
192 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
193 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], | |
194 | regs->u_regs[3]); | |
195 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", | |
196 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], | |
197 | regs->u_regs[7]); | |
198 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", | |
199 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], | |
200 | regs->u_regs[11]); | |
201 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", | |
202 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], | |
203 | regs->u_regs[15]); | |
4fe3ebec | 204 | printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
1da177e4 | 205 | show_regwindow(regs); |
87e8f0e3 | 206 | show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); |
1da177e4 LT |
207 | } |
208 | ||
916ca14a DM |
209 | union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; |
210 | static DEFINE_SPINLOCK(global_cpu_snapshot_lock); | |
93dae5b7 DM |
211 | |
212 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, | |
213 | int this_cpu) | |
214 | { | |
916ca14a DM |
215 | struct global_reg_snapshot *rp; |
216 | ||
93dae5b7 DM |
217 | flushw_all(); |
218 | ||
916ca14a DM |
219 | rp = &global_cpu_snapshot[this_cpu].reg; |
220 | ||
221 | rp->tstate = regs->tstate; | |
222 | rp->tpc = regs->tpc; | |
223 | rp->tnpc = regs->tnpc; | |
224 | rp->o7 = regs->u_regs[UREG_I7]; | |
93dae5b7 DM |
225 | |
226 | if (regs->tstate & TSTATE_PRIV) { | |
227 | struct reg_window *rw; | |
228 | ||
229 | rw = (struct reg_window *) | |
230 | (regs->u_regs[UREG_FP] + STACK_BIAS); | |
4f70f7a9 | 231 | if (kstack_valid(tp, (unsigned long) rw)) { |
916ca14a | 232 | rp->i7 = rw->ins[7]; |
5afe2738 DM |
233 | rw = (struct reg_window *) |
234 | (rw->ins[6] + STACK_BIAS); | |
4f70f7a9 | 235 | if (kstack_valid(tp, (unsigned long) rw)) |
916ca14a | 236 | rp->rpc = rw->ins[7]; |
5afe2738 DM |
237 | } |
238 | } else { | |
916ca14a DM |
239 | rp->i7 = 0; |
240 | rp->rpc = 0; | |
5afe2738 | 241 | } |
916ca14a | 242 | rp->thread = tp; |
93dae5b7 DM |
243 | } |
244 | ||
245 | /* In order to avoid hangs we do not try to synchronize with the | |
246 | * global register dump client cpus. The last store they make is to | |
247 | * the thread pointer, so do a short poll waiting for that to become | |
248 | * non-NULL. | |
249 | */ | |
250 | static void __global_reg_poll(struct global_reg_snapshot *gp) | |
251 | { | |
252 | int limit = 0; | |
253 | ||
254 | while (!gp->thread && ++limit < 100) { | |
255 | barrier(); | |
256 | udelay(1); | |
257 | } | |
258 | } | |
259 | ||
47cab6a7 | 260 | void arch_trigger_all_cpu_backtrace(void) |
93dae5b7 DM |
261 | { |
262 | struct thread_info *tp = current_thread_info(); | |
263 | struct pt_regs *regs = get_irq_regs(); | |
93dae5b7 DM |
264 | unsigned long flags; |
265 | int this_cpu, cpu; | |
266 | ||
267 | if (!regs) | |
268 | regs = tp->kregs; | |
269 | ||
916ca14a | 270 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); |
93dae5b7 | 271 | |
916ca14a | 272 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
93dae5b7 DM |
273 | |
274 | this_cpu = raw_smp_processor_id(); | |
275 | ||
276 | __global_reg_self(tp, regs, this_cpu); | |
277 | ||
278 | smp_fetch_global_regs(); | |
279 | ||
280 | for_each_online_cpu(cpu) { | |
916ca14a | 281 | struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg; |
93dae5b7 DM |
282 | |
283 | __global_reg_poll(gp); | |
284 | ||
285 | tp = gp->thread; | |
286 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", | |
287 | (cpu == this_cpu ? '*' : ' '), cpu, | |
288 | gp->tstate, gp->tpc, gp->tnpc, | |
289 | ((tp && tp->task) ? tp->task->comm : "NULL"), | |
290 | ((tp && tp->task) ? tp->task->pid : -1)); | |
4fe3ebec | 291 | |
93dae5b7 | 292 | if (gp->tstate & TSTATE_PRIV) { |
5afe2738 | 293 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
4fe3ebec DM |
294 | (void *) gp->tpc, |
295 | (void *) gp->o7, | |
5afe2738 DM |
296 | (void *) gp->i7, |
297 | (void *) gp->rpc); | |
4fe3ebec | 298 | } else { |
5afe2738 DM |
299 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
300 | gp->tpc, gp->o7, gp->i7, gp->rpc); | |
93dae5b7 DM |
301 | } |
302 | } | |
303 | ||
916ca14a | 304 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
93dae5b7 | 305 | |
916ca14a | 306 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); |
93dae5b7 DM |
307 | } |
308 | ||
09ee167c DM |
309 | #ifdef CONFIG_MAGIC_SYSRQ |
310 | ||
1495cc9d | 311 | static void sysrq_handle_globreg(int key) |
09ee167c | 312 | { |
47cab6a7 | 313 | arch_trigger_all_cpu_backtrace(); |
09ee167c DM |
314 | } |
315 | ||
93dae5b7 DM |
316 | static struct sysrq_key_op sparc_globalreg_op = { |
317 | .handler = sysrq_handle_globreg, | |
916ca14a | 318 | .help_msg = "global-regs(Y)", |
93dae5b7 DM |
319 | .action_msg = "Show Global CPU Regs", |
320 | }; | |
321 | ||
916ca14a DM |
322 | static void __global_pmu_self(int this_cpu) |
323 | { | |
324 | struct global_pmu_snapshot *pp; | |
325 | int i, num; | |
326 | ||
327 | pp = &global_cpu_snapshot[this_cpu].pmu; | |
328 | ||
329 | num = 1; | |
330 | if (tlb_type == hypervisor && | |
331 | sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) | |
332 | num = 4; | |
333 | ||
334 | for (i = 0; i < num; i++) { | |
335 | pp->pcr[i] = pcr_ops->read_pcr(i); | |
336 | pp->pic[i] = pcr_ops->read_pic(i); | |
337 | } | |
338 | } | |
339 | ||
340 | static void __global_pmu_poll(struct global_pmu_snapshot *pp) | |
341 | { | |
342 | int limit = 0; | |
343 | ||
344 | while (!pp->pcr[0] && ++limit < 100) { | |
345 | barrier(); | |
346 | udelay(1); | |
347 | } | |
348 | } | |
349 | ||
350 | static void pmu_snapshot_all_cpus(void) | |
93dae5b7 | 351 | { |
916ca14a DM |
352 | unsigned long flags; |
353 | int this_cpu, cpu; | |
354 | ||
355 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); | |
356 | ||
357 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
358 | ||
359 | this_cpu = raw_smp_processor_id(); | |
360 | ||
361 | __global_pmu_self(this_cpu); | |
362 | ||
363 | smp_fetch_global_pmu(); | |
364 | ||
365 | for_each_online_cpu(cpu) { | |
366 | struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu; | |
367 | ||
368 | __global_pmu_poll(pp); | |
369 | ||
370 | printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n", | |
371 | (cpu == this_cpu ? '*' : ' '), cpu, | |
372 | pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], | |
373 | pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]); | |
374 | } | |
375 | ||
376 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); | |
377 | ||
378 | spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); | |
379 | } | |
380 | ||
381 | static void sysrq_handle_globpmu(int key) | |
382 | { | |
383 | pmu_snapshot_all_cpus(); | |
384 | } | |
385 | ||
386 | static struct sysrq_key_op sparc_globalpmu_op = { | |
387 | .handler = sysrq_handle_globpmu, | |
388 | .help_msg = "global-pmu(X)", | |
389 | .action_msg = "Show Global PMU Regs", | |
390 | }; | |
391 | ||
392 | static int __init sparc_sysrq_init(void) | |
393 | { | |
394 | int ret = register_sysrq_key('y', &sparc_globalreg_op); | |
395 | ||
396 | if (!ret) | |
397 | ret = register_sysrq_key('x', &sparc_globalpmu_op); | |
398 | return ret; | |
93dae5b7 DM |
399 | } |
400 | ||
916ca14a | 401 | core_initcall(sparc_sysrq_init); |
93dae5b7 DM |
402 | |
403 | #endif | |
404 | ||
1da177e4 LT |
405 | unsigned long thread_saved_pc(struct task_struct *tsk) |
406 | { | |
f3169641 | 407 | struct thread_info *ti = task_thread_info(tsk); |
1da177e4 LT |
408 | unsigned long ret = 0xdeadbeefUL; |
409 | ||
410 | if (ti && ti->ksp) { | |
411 | unsigned long *sp; | |
412 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); | |
413 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && | |
414 | sp[14]) { | |
415 | unsigned long *fp; | |
416 | fp = (unsigned long *)(sp[14] + STACK_BIAS); | |
417 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) | |
418 | ret = fp[15]; | |
419 | } | |
420 | } | |
421 | return ret; | |
422 | } | |
423 | ||
424 | /* Free current thread data structures etc.. */ | |
425 | void exit_thread(void) | |
426 | { | |
427 | struct thread_info *t = current_thread_info(); | |
428 | ||
429 | if (t->utraps) { | |
430 | if (t->utraps[0] < 2) | |
431 | kfree (t->utraps); | |
432 | else | |
433 | t->utraps[0]--; | |
434 | } | |
1da177e4 LT |
435 | } |
436 | ||
437 | void flush_thread(void) | |
438 | { | |
439 | struct thread_info *t = current_thread_info(); | |
74bf4312 | 440 | struct mm_struct *mm; |
1da177e4 | 441 | |
74bf4312 DM |
442 | mm = t->task->mm; |
443 | if (mm) | |
98c5584c | 444 | tsb_context_switch(mm); |
1da177e4 | 445 | |
1da177e4 LT |
446 | set_thread_wsaved(0); |
447 | ||
1da177e4 LT |
448 | /* Clear FPU register state. */ |
449 | t->fpsaved[0] = 0; | |
1da177e4 LT |
450 | } |
451 | ||
452 | /* It's a bit more tricky when 64-bit tasks are involved... */ | |
453 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) | |
454 | { | |
455 | unsigned long fp, distance, rval; | |
456 | ||
457 | if (!(test_thread_flag(TIF_32BIT))) { | |
458 | csp += STACK_BIAS; | |
459 | psp += STACK_BIAS; | |
460 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); | |
461 | fp += STACK_BIAS; | |
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; | |
475 | else if (test_thread_flag(TIF_32BIT)) { | |
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) { | |
510 | int winsize = sizeof(struct reg_window); | |
511 | int bias = 0; | |
512 | ||
513 | if (test_thread_flag(TIF_32BIT)) | |
514 | winsize = sizeof(struct reg_window32); | |
515 | else | |
516 | bias = STACK_BIAS; | |
517 | ||
518 | window -= 1; | |
519 | do { | |
520 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
521 | struct reg_window *rwin = &t->reg_window[window]; | |
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; | |
547 | int winsize = sizeof(struct reg_window); | |
548 | int bias = 0; | |
549 | ||
550 | if (test_thread_flag(TIF_32BIT)) | |
551 | winsize = sizeof(struct reg_window32); | |
552 | else | |
553 | bias = STACK_BIAS; | |
554 | ||
555 | flush_user_windows(); | |
556 | window = get_thread_wsaved(); | |
557 | ||
314ef685 | 558 | if (likely(window != 0)) { |
1da177e4 LT |
559 | window -= 1; |
560 | do { | |
561 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); | |
562 | struct reg_window *rwin = &t->reg_window[window]; | |
563 | ||
314ef685 DM |
564 | if (unlikely(sp & 0x7UL)) |
565 | stack_unaligned(sp); | |
566 | ||
567 | if (unlikely(copy_to_user((char __user *)sp, | |
568 | rwin, winsize))) | |
1da177e4 LT |
569 | goto barf; |
570 | } while (window--); | |
571 | } | |
572 | set_thread_wsaved(0); | |
573 | return; | |
574 | ||
575 | barf: | |
576 | set_thread_wsaved(window + 1); | |
577 | do_exit(SIGILL); | |
578 | } | |
579 | ||
580 | asmlinkage long sparc_do_fork(unsigned long clone_flags, | |
581 | unsigned long stack_start, | |
582 | struct pt_regs *regs, | |
583 | unsigned long stack_size) | |
584 | { | |
585 | int __user *parent_tid_ptr, *child_tid_ptr; | |
1e38c126 DM |
586 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
587 | long ret; | |
1da177e4 LT |
588 | |
589 | #ifdef CONFIG_COMPAT | |
590 | if (test_thread_flag(TIF_32BIT)) { | |
591 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); | |
592 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); | |
593 | } else | |
594 | #endif | |
595 | { | |
596 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; | |
597 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; | |
598 | } | |
599 | ||
1e38c126 DM |
600 | ret = do_fork(clone_flags, stack_start, |
601 | regs, stack_size, | |
602 | parent_tid_ptr, child_tid_ptr); | |
603 | ||
604 | /* If we get an error and potentially restart the system | |
605 | * call, we're screwed because copy_thread() clobbered | |
606 | * the parent's %o1. So detect that case and restore it | |
607 | * here. | |
608 | */ | |
609 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
610 | regs->u_regs[UREG_I1] = orig_i1; | |
611 | ||
612 | return ret; | |
1da177e4 LT |
613 | } |
614 | ||
615 | /* Copy a Sparc thread. The fork() return value conventions | |
616 | * under SunOS are nothing short of bletcherous: | |
617 | * Parent --> %o0 == childs pid, %o1 == 0 | |
618 | * Child --> %o0 == parents pid, %o1 == 1 | |
619 | */ | |
6f2c55b8 | 620 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
1da177e4 LT |
621 | unsigned long unused, |
622 | struct task_struct *p, struct pt_regs *regs) | |
623 | { | |
ee3eea16 | 624 | struct thread_info *t = task_thread_info(p); |
a051bc5b DM |
625 | struct sparc_stackf *parent_sf; |
626 | unsigned long child_stack_sz; | |
1da177e4 | 627 | char *child_trap_frame; |
a051bc5b | 628 | int kernel_thread; |
1da177e4 | 629 | |
a051bc5b DM |
630 | kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0; |
631 | parent_sf = ((struct sparc_stackf *) regs) - 1; | |
1da177e4 | 632 | |
a051bc5b DM |
633 | /* Calculate offset to stack_frame & pt_regs */ |
634 | child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) + | |
635 | (kernel_thread ? STACKFRAME_SZ : 0)); | |
636 | child_trap_frame = (task_stack_page(p) + | |
637 | (THREAD_SIZE - child_stack_sz)); | |
638 | memcpy(child_trap_frame, parent_sf, child_stack_sz); | |
639 | ||
640 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | | |
641 | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | | |
1da177e4 | 642 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
db7d9a4e | 643 | t->new_child = 1; |
1da177e4 | 644 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
a051bc5b DM |
645 | t->kregs = (struct pt_regs *) (child_trap_frame + |
646 | sizeof(struct sparc_stackf)); | |
1da177e4 LT |
647 | t->fpsaved[0] = 0; |
648 | ||
a051bc5b DM |
649 | if (kernel_thread) { |
650 | struct sparc_stackf *child_sf = (struct sparc_stackf *) | |
651 | (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ)); | |
652 | ||
653 | /* Zero terminate the stack backtrace. */ | |
654 | child_sf->fp = NULL; | |
655 | t->kregs->u_regs[UREG_FP] = | |
656 | ((unsigned long) child_sf) - STACK_BIAS; | |
657 | ||
1da177e4 | 658 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); |
1da177e4 LT |
659 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; |
660 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; | |
661 | } else { | |
662 | if (t->flags & _TIF_32BIT) { | |
663 | sp &= 0x00000000ffffffffUL; | |
664 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
665 | } | |
666 | t->kregs->u_regs[UREG_FP] = sp; | |
667 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); | |
668 | if (sp != regs->u_regs[UREG_FP]) { | |
669 | unsigned long csp; | |
670 | ||
671 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); | |
672 | if (!csp) | |
673 | return -EFAULT; | |
674 | t->kregs->u_regs[UREG_FP] = csp; | |
675 | } | |
676 | if (t->utraps) | |
677 | t->utraps[0]++; | |
678 | } | |
679 | ||
680 | /* Set the return value for the child. */ | |
681 | t->kregs->u_regs[UREG_I0] = current->pid; | |
682 | t->kregs->u_regs[UREG_I1] = 1; | |
683 | ||
684 | /* Set the second return value for the parent. */ | |
685 | regs->u_regs[UREG_I1] = 0; | |
686 | ||
687 | if (clone_flags & CLONE_SETTLS) | |
688 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | /* | |
694 | * This is the mechanism for creating a new kernel thread. | |
695 | * | |
696 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
697 | * who haven't done an "execve()") should use this: it will work within | |
698 | * a system call from a "real" process, but the process memory space will | |
e5dd42e4 | 699 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
700 | */ |
701 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
702 | { | |
703 | long retval; | |
704 | ||
705 | /* If the parent runs before fn(arg) is called by the child, | |
706 | * the input registers of this function can be clobbered. | |
707 | * So we stash 'fn' and 'arg' into global registers which | |
708 | * will not be modified by the parent. | |
709 | */ | |
710 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ | |
711 | "mov %5, %%g3\n\t" /* Save ARG into global */ | |
712 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ | |
713 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
714 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
715 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ | |
716 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ | |
717 | " mov %%o0, %0\n\t" | |
718 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
719 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ | |
720 | "mov %3, %%g1\n\t" | |
721 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ | |
722 | /* Notreached by child. */ | |
723 | "1:" : | |
724 | "=r" (retval) : | |
725 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
726 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
727 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
728 | return retval; | |
729 | } | |
917c3660 | 730 | EXPORT_SYMBOL(kernel_thread); |
1da177e4 | 731 | |
1da177e4 LT |
732 | typedef struct { |
733 | union { | |
734 | unsigned int pr_regs[32]; | |
735 | unsigned long pr_dregs[16]; | |
736 | } pr_fr; | |
737 | unsigned int __unused; | |
738 | unsigned int pr_fsr; | |
739 | unsigned char pr_qcnt; | |
740 | unsigned char pr_q_entrysize; | |
741 | unsigned char pr_en; | |
742 | unsigned int pr_q[64]; | |
743 | } elf_fpregset_t32; | |
744 | ||
745 | /* | |
746 | * fill in the fpu structure for a core dump. | |
747 | */ | |
748 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
749 | { | |
750 | unsigned long *kfpregs = current_thread_info()->fpregs; | |
751 | unsigned long fprs = current_thread_info()->fpsaved[0]; | |
752 | ||
753 | if (test_thread_flag(TIF_32BIT)) { | |
754 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; | |
755 | ||
756 | if (fprs & FPRS_DL) | |
757 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, | |
758 | sizeof(unsigned int) * 32); | |
759 | else | |
760 | memset(&fpregs32->pr_fr.pr_regs[0], 0, | |
761 | sizeof(unsigned int) * 32); | |
762 | fpregs32->pr_qcnt = 0; | |
763 | fpregs32->pr_q_entrysize = 8; | |
764 | memset(&fpregs32->pr_q[0], 0, | |
765 | (sizeof(unsigned int) * 64)); | |
766 | if (fprs & FPRS_FEF) { | |
767 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; | |
768 | fpregs32->pr_en = 1; | |
769 | } else { | |
770 | fpregs32->pr_fsr = 0; | |
771 | fpregs32->pr_en = 0; | |
772 | } | |
773 | } else { | |
774 | if(fprs & FPRS_DL) | |
775 | memcpy(&fpregs->pr_regs[0], kfpregs, | |
776 | sizeof(unsigned int) * 32); | |
777 | else | |
778 | memset(&fpregs->pr_regs[0], 0, | |
779 | sizeof(unsigned int) * 32); | |
780 | if(fprs & FPRS_DU) | |
781 | memcpy(&fpregs->pr_regs[16], kfpregs+16, | |
782 | sizeof(unsigned int) * 32); | |
783 | else | |
784 | memset(&fpregs->pr_regs[16], 0, | |
785 | sizeof(unsigned int) * 32); | |
786 | if(fprs & FPRS_FEF) { | |
787 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; | |
788 | fpregs->pr_gsr = current_thread_info()->gsr[0]; | |
789 | } else { | |
790 | fpregs->pr_fsr = fpregs->pr_gsr = 0; | |
791 | } | |
792 | fpregs->pr_fprs = fprs; | |
793 | } | |
794 | return 1; | |
795 | } | |
917c3660 | 796 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 LT |
797 | |
798 | /* | |
799 | * sparc_execve() executes a new program after the asm stub has set | |
800 | * things up for us. This should basically do what I want it to. | |
801 | */ | |
802 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
803 | { | |
804 | int error, base = 0; | |
91a27b2a | 805 | struct filename *filename; |
1da177e4 LT |
806 | |
807 | /* User register window flush is done by entry.S */ | |
808 | ||
809 | /* Check for indirect call. */ | |
810 | if (regs->u_regs[UREG_G1] == 0) | |
811 | base = 1; | |
812 | ||
813 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
814 | error = PTR_ERR(filename); | |
815 | if (IS_ERR(filename)) | |
816 | goto out; | |
91a27b2a | 817 | error = do_execve(filename->name, |
d7627467 | 818 | (const char __user *const __user *) |
1da177e4 | 819 | regs->u_regs[base + UREG_I1], |
d7627467 | 820 | (const char __user *const __user *) |
1da177e4 LT |
821 | regs->u_regs[base + UREG_I2], regs); |
822 | putname(filename); | |
823 | if (!error) { | |
824 | fprs_write(0); | |
825 | current_thread_info()->xfsr[0] = 0; | |
826 | current_thread_info()->fpsaved[0] = 0; | |
827 | regs->tstate &= ~TSTATE_PEF; | |
1da177e4 LT |
828 | } |
829 | out: | |
830 | return error; | |
831 | } | |
832 | ||
833 | unsigned long get_wchan(struct task_struct *task) | |
834 | { | |
835 | unsigned long pc, fp, bias = 0; | |
4f70f7a9 | 836 | struct thread_info *tp; |
1da177e4 LT |
837 | struct reg_window *rw; |
838 | unsigned long ret = 0; | |
839 | int count = 0; | |
840 | ||
841 | if (!task || task == current || | |
842 | task->state == TASK_RUNNING) | |
843 | goto out; | |
844 | ||
4f70f7a9 | 845 | tp = task_thread_info(task); |
1da177e4 | 846 | bias = STACK_BIAS; |
f3169641 | 847 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
848 | |
849 | do { | |
4f70f7a9 | 850 | if (!kstack_valid(tp, fp)) |
1da177e4 LT |
851 | break; |
852 | rw = (struct reg_window *) fp; | |
853 | pc = rw->ins[7]; | |
854 | if (!in_sched_functions(pc)) { | |
855 | ret = pc; | |
856 | goto out; | |
857 | } | |
858 | fp = rw->ins[6] + bias; | |
859 | } while (++count < 16); | |
860 | ||
861 | out: | |
862 | return ret; | |
863 | } |