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

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