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Linux/arch/sparc/kernel/process_32.c

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  1 /*  linux/arch/sparc/kernel/process.c
  2  *
  3  *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
  4  *  Copyright (C) 1996 Eddie C. Dost   (ecd@skynet.be)
  5  */
  6 
  7 /*
  8  * This file handles the architecture-dependent parts of process handling..
  9  */
 10 
 11 #include <stdarg.h>
 12 
 13 #include <linux/elfcore.h>
 14 #include <linux/errno.h>
 15 #include <linux/module.h>
 16 #include <linux/sched.h>
 17 #include <linux/kernel.h>
 18 #include <linux/mm.h>
 19 #include <linux/stddef.h>
 20 #include <linux/ptrace.h>
 21 #include <linux/user.h>
 22 #include <linux/smp.h>
 23 #include <linux/reboot.h>
 24 #include <linux/delay.h>
 25 #include <linux/pm.h>
 26 #include <linux/slab.h>
 27 #include <linux/cpu.h>
 28 
 29 #include <asm/auxio.h>
 30 #include <asm/oplib.h>
 31 #include <asm/uaccess.h>
 32 #include <asm/page.h>
 33 #include <asm/pgalloc.h>
 34 #include <asm/pgtable.h>
 35 #include <asm/delay.h>
 36 #include <asm/processor.h>
 37 #include <asm/psr.h>
 38 #include <asm/elf.h>
 39 #include <asm/prom.h>
 40 #include <asm/unistd.h>
 41 #include <asm/setup.h>
 42 
 43 #include "kernel.h"
 44 
 45 /* 
 46  * Power management idle function 
 47  * Set in pm platform drivers (apc.c and pmc.c)
 48  */
 49 void (*sparc_idle)(void);
 50 
 51 /* 
 52  * Power-off handler instantiation for pm.h compliance
 53  * This is done via auxio, but could be used as a fallback
 54  * handler when auxio is not present-- unused for now...
 55  */
 56 void (*pm_power_off)(void) = machine_power_off;
 57 EXPORT_SYMBOL(pm_power_off);
 58 
 59 /*
 60  * sysctl - toggle power-off restriction for serial console 
 61  * systems in machine_power_off()
 62  */
 63 int scons_pwroff = 1;
 64 
 65 extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
 66 
 67 struct task_struct *last_task_used_math = NULL;
 68 struct thread_info *current_set[NR_CPUS];
 69 
 70 /* Idle loop support. */
 71 void arch_cpu_idle(void)
 72 {
 73         if (sparc_idle)
 74                 (*sparc_idle)();
 75         local_irq_enable();
 76 }
 77 
 78 /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
 79 void machine_halt(void)
 80 {
 81         local_irq_enable();
 82         mdelay(8);
 83         local_irq_disable();
 84         prom_halt();
 85         panic("Halt failed!");
 86 }
 87 
 88 void machine_restart(char * cmd)
 89 {
 90         char *p;
 91         
 92         local_irq_enable();
 93         mdelay(8);
 94         local_irq_disable();
 95 
 96         p = strchr (reboot_command, '\n');
 97         if (p) *p = 0;
 98         if (cmd)
 99                 prom_reboot(cmd);
100         if (*reboot_command)
101                 prom_reboot(reboot_command);
102         prom_feval ("reset");
103         panic("Reboot failed!");
104 }
105 
106 void machine_power_off(void)
107 {
108         if (auxio_power_register &&
109             (strcmp(of_console_device->type, "serial") || scons_pwroff)) {
110                 u8 power_register = sbus_readb(auxio_power_register);
111                 power_register |= AUXIO_POWER_OFF;
112                 sbus_writeb(power_register, auxio_power_register);
113         }
114 
115         machine_halt();
116 }
117 
118 void show_regs(struct pt_regs *r)
119 {
120         struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14];
121 
122         show_regs_print_info(KERN_DEFAULT);
123 
124         printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx    %s\n",
125                r->psr, r->pc, r->npc, r->y, print_tainted());
126         printk("PC: <%pS>\n", (void *) r->pc);
127         printk("%%G: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
128                r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
129                r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
130         printk("%%O: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
131                r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
132                r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
133         printk("RPC: <%pS>\n", (void *) r->u_regs[15]);
134 
135         printk("%%L: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
136                rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
137                rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
138         printk("%%I: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
139                rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
140                rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
141 }
142 
143 /*
144  * The show_stack is an external API which we do not use ourselves.
145  * The oops is printed in die_if_kernel.
146  */
147 void show_stack(struct task_struct *tsk, unsigned long *_ksp)
148 {
149         unsigned long pc, fp;
150         unsigned long task_base;
151         struct reg_window32 *rw;
152         int count = 0;
153 
154         if (!tsk)
155                 tsk = current;
156 
157         if (tsk == current && !_ksp)
158                 __asm__ __volatile__("mov       %%fp, %0" : "=r" (_ksp));
159 
160         task_base = (unsigned long) task_stack_page(tsk);
161         fp = (unsigned long) _ksp;
162         do {
163                 /* Bogus frame pointer? */
164                 if (fp < (task_base + sizeof(struct thread_info)) ||
165                     fp >= (task_base + (PAGE_SIZE << 1)))
166                         break;
167                 rw = (struct reg_window32 *) fp;
168                 pc = rw->ins[7];
169                 printk("[%08lx : ", pc);
170                 printk("%pS ] ", (void *) pc);
171                 fp = rw->ins[6];
172         } while (++count < 16);
173         printk("\n");
174 }
175 
176 /*
177  * Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
178  */
179 unsigned long thread_saved_pc(struct task_struct *tsk)
180 {
181         return task_thread_info(tsk)->kpc;
182 }
183 
184 /*
185  * Free current thread data structures etc..
186  */
187 void exit_thread(void)
188 {
189 #ifndef CONFIG_SMP
190         if(last_task_used_math == current) {
191 #else
192         if (test_thread_flag(TIF_USEDFPU)) {
193 #endif
194                 /* Keep process from leaving FPU in a bogon state. */
195                 put_psr(get_psr() | PSR_EF);
196                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
197                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
198 #ifndef CONFIG_SMP
199                 last_task_used_math = NULL;
200 #else
201                 clear_thread_flag(TIF_USEDFPU);
202 #endif
203         }
204 }
205 
206 void flush_thread(void)
207 {
208         current_thread_info()->w_saved = 0;
209 
210 #ifndef CONFIG_SMP
211         if(last_task_used_math == current) {
212 #else
213         if (test_thread_flag(TIF_USEDFPU)) {
214 #endif
215                 /* Clean the fpu. */
216                 put_psr(get_psr() | PSR_EF);
217                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
218                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
219 #ifndef CONFIG_SMP
220                 last_task_used_math = NULL;
221 #else
222                 clear_thread_flag(TIF_USEDFPU);
223 #endif
224         }
225 
226         /* This task is no longer a kernel thread. */
227         if (current->thread.flags & SPARC_FLAG_KTHREAD) {
228                 current->thread.flags &= ~SPARC_FLAG_KTHREAD;
229 
230                 /* We must fixup kregs as well. */
231                 /* XXX This was not fixed for ti for a while, worked. Unused? */
232                 current->thread.kregs = (struct pt_regs *)
233                     (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
234         }
235 }
236 
237 static inline struct sparc_stackf __user *
238 clone_stackframe(struct sparc_stackf __user *dst,
239                  struct sparc_stackf __user *src)
240 {
241         unsigned long size, fp;
242         struct sparc_stackf *tmp;
243         struct sparc_stackf __user *sp;
244 
245         if (get_user(tmp, &src->fp))
246                 return NULL;
247 
248         fp = (unsigned long) tmp;
249         size = (fp - ((unsigned long) src));
250         fp = (unsigned long) dst;
251         sp = (struct sparc_stackf __user *)(fp - size); 
252 
253         /* do_fork() grabs the parent semaphore, we must release it
254          * temporarily so we can build the child clone stack frame
255          * without deadlocking.
256          */
257         if (__copy_user(sp, src, size))
258                 sp = NULL;
259         else if (put_user(fp, &sp->fp))
260                 sp = NULL;
261 
262         return sp;
263 }
264 
265 asmlinkage int sparc_do_fork(unsigned long clone_flags,
266                              unsigned long stack_start,
267                              struct pt_regs *regs,
268                              unsigned long stack_size)
269 {
270         unsigned long parent_tid_ptr, child_tid_ptr;
271         unsigned long orig_i1 = regs->u_regs[UREG_I1];
272         long ret;
273 
274         parent_tid_ptr = regs->u_regs[UREG_I2];
275         child_tid_ptr = regs->u_regs[UREG_I4];
276 
277         ret = do_fork(clone_flags, stack_start, stack_size,
278                       (int __user *) parent_tid_ptr,
279                       (int __user *) child_tid_ptr);
280 
281         /* If we get an error and potentially restart the system
282          * call, we're screwed because copy_thread() clobbered
283          * the parent's %o1.  So detect that case and restore it
284          * here.
285          */
286         if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
287                 regs->u_regs[UREG_I1] = orig_i1;
288 
289         return ret;
290 }
291 
292 /* Copy a Sparc thread.  The fork() return value conventions
293  * under SunOS are nothing short of bletcherous:
294  * Parent -->  %o0 == childs  pid, %o1 == 0
295  * Child  -->  %o0 == parents pid, %o1 == 1
296  *
297  * NOTE: We have a separate fork kpsr/kwim because
298  *       the parent could change these values between
299  *       sys_fork invocation and when we reach here
300  *       if the parent should sleep while trying to
301  *       allocate the task_struct and kernel stack in
302  *       do_fork().
303  * XXX See comment above sys_vfork in sparc64. todo.
304  */
305 extern void ret_from_fork(void);
306 extern void ret_from_kernel_thread(void);
307 
308 int copy_thread(unsigned long clone_flags, unsigned long sp,
309                 unsigned long arg, struct task_struct *p)
310 {
311         struct thread_info *ti = task_thread_info(p);
312         struct pt_regs *childregs, *regs = current_pt_regs();
313         char *new_stack;
314 
315 #ifndef CONFIG_SMP
316         if(last_task_used_math == current) {
317 #else
318         if (test_thread_flag(TIF_USEDFPU)) {
319 #endif
320                 put_psr(get_psr() | PSR_EF);
321                 fpsave(&p->thread.float_regs[0], &p->thread.fsr,
322                        &p->thread.fpqueue[0], &p->thread.fpqdepth);
323         }
324 
325         /*
326          *  p->thread_info         new_stack   childregs stack bottom
327          *  !                      !           !             !
328          *  V                      V (stk.fr.) V  (pt_regs)  V
329          *  +----- - - - - - ------+===========+=============+
330          */
331         new_stack = task_stack_page(p) + THREAD_SIZE;
332         new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
333         childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
334 
335         /*
336          * A new process must start with interrupts closed in 2.5,
337          * because this is how Mingo's scheduler works (see schedule_tail
338          * and finish_arch_switch). If we do not do it, a timer interrupt hits
339          * before we unlock, attempts to re-take the rq->lock, and then we die.
340          * Thus, kpsr|=PSR_PIL.
341          */
342         ti->ksp = (unsigned long) new_stack;
343         p->thread.kregs = childregs;
344 
345         if (unlikely(p->flags & PF_KTHREAD)) {
346                 extern int nwindows;
347                 unsigned long psr;
348                 memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ);
349                 p->thread.flags |= SPARC_FLAG_KTHREAD;
350                 p->thread.current_ds = KERNEL_DS;
351                 ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8);
352                 childregs->u_regs[UREG_G1] = sp; /* function */
353                 childregs->u_regs[UREG_G2] = arg;
354                 psr = childregs->psr = get_psr();
355                 ti->kpsr = psr | PSR_PIL;
356                 ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows);
357                 return 0;
358         }
359         memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
360         childregs->u_regs[UREG_FP] = sp;
361         p->thread.flags &= ~SPARC_FLAG_KTHREAD;
362         p->thread.current_ds = USER_DS;
363         ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
364         ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
365         ti->kwim = current->thread.fork_kwim;
366 
367         if (sp != regs->u_regs[UREG_FP]) {
368                 struct sparc_stackf __user *childstack;
369                 struct sparc_stackf __user *parentstack;
370 
371                 /*
372                  * This is a clone() call with supplied user stack.
373                  * Set some valid stack frames to give to the child.
374                  */
375                 childstack = (struct sparc_stackf __user *)
376                         (sp & ~0xfUL);
377                 parentstack = (struct sparc_stackf __user *)
378                         regs->u_regs[UREG_FP];
379 
380 #if 0
381                 printk("clone: parent stack:\n");
382                 show_stackframe(parentstack);
383 #endif
384 
385                 childstack = clone_stackframe(childstack, parentstack);
386                 if (!childstack)
387                         return -EFAULT;
388 
389 #if 0
390                 printk("clone: child stack:\n");
391                 show_stackframe(childstack);
392 #endif
393 
394                 childregs->u_regs[UREG_FP] = (unsigned long)childstack;
395         }
396 
397 #ifdef CONFIG_SMP
398         /* FPU must be disabled on SMP. */
399         childregs->psr &= ~PSR_EF;
400         clear_tsk_thread_flag(p, TIF_USEDFPU);
401 #endif
402 
403         /* Set the return value for the child. */
404         childregs->u_regs[UREG_I0] = current->pid;
405         childregs->u_regs[UREG_I1] = 1;
406 
407         /* Set the return value for the parent. */
408         regs->u_regs[UREG_I1] = 0;
409 
410         if (clone_flags & CLONE_SETTLS)
411                 childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
412 
413         return 0;
414 }
415 
416 /*
417  * fill in the fpu structure for a core dump.
418  */
419 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
420 {
421         if (used_math()) {
422                 memset(fpregs, 0, sizeof(*fpregs));
423                 fpregs->pr_q_entrysize = 8;
424                 return 1;
425         }
426 #ifdef CONFIG_SMP
427         if (test_thread_flag(TIF_USEDFPU)) {
428                 put_psr(get_psr() | PSR_EF);
429                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
430                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
431                 if (regs != NULL) {
432                         regs->psr &= ~(PSR_EF);
433                         clear_thread_flag(TIF_USEDFPU);
434                 }
435         }
436 #else
437         if (current == last_task_used_math) {
438                 put_psr(get_psr() | PSR_EF);
439                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
440                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
441                 if (regs != NULL) {
442                         regs->psr &= ~(PSR_EF);
443                         last_task_used_math = NULL;
444                 }
445         }
446 #endif
447         memcpy(&fpregs->pr_fr.pr_regs[0],
448                &current->thread.float_regs[0],
449                (sizeof(unsigned long) * 32));
450         fpregs->pr_fsr = current->thread.fsr;
451         fpregs->pr_qcnt = current->thread.fpqdepth;
452         fpregs->pr_q_entrysize = 8;
453         fpregs->pr_en = 1;
454         if(fpregs->pr_qcnt != 0) {
455                 memcpy(&fpregs->pr_q[0],
456                        &current->thread.fpqueue[0],
457                        sizeof(struct fpq) * fpregs->pr_qcnt);
458         }
459         /* Zero out the rest. */
460         memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
461                sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
462         return 1;
463 }
464 
465 unsigned long get_wchan(struct task_struct *task)
466 {
467         unsigned long pc, fp, bias = 0;
468         unsigned long task_base = (unsigned long) task;
469         unsigned long ret = 0;
470         struct reg_window32 *rw;
471         int count = 0;
472 
473         if (!task || task == current ||
474             task->state == TASK_RUNNING)
475                 goto out;
476 
477         fp = task_thread_info(task)->ksp + bias;
478         do {
479                 /* Bogus frame pointer? */
480                 if (fp < (task_base + sizeof(struct thread_info)) ||
481                     fp >= (task_base + (2 * PAGE_SIZE)))
482                         break;
483                 rw = (struct reg_window32 *) fp;
484                 pc = rw->ins[7];
485                 if (!in_sched_functions(pc)) {
486                         ret = pc;
487                         goto out;
488                 }
489                 fp = rw->ins[6] + bias;
490         } while (++count < 16);
491 
492 out:
493         return ret;
494 }
495 
496 

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