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Linux/arch/sparc/kernel/process_32.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*  linux/arch/sparc/kernel/process.c
  3  *
  4  *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
  5  *  Copyright (C) 1996 Eddie C. Dost   (ecd@skynet.be)
  6  */
  7 
  8 /*
  9  * This file handles the architecture-dependent parts of process handling..
 10  */
 11 
 12 #include <stdarg.h>
 13 
 14 #include <linux/elfcore.h>
 15 #include <linux/errno.h>
 16 #include <linux/module.h>
 17 #include <linux/sched.h>
 18 #include <linux/sched/debug.h>
 19 #include <linux/sched/task.h>
 20 #include <linux/sched/task_stack.h>
 21 #include <linux/kernel.h>
 22 #include <linux/mm.h>
 23 #include <linux/stddef.h>
 24 #include <linux/ptrace.h>
 25 #include <linux/user.h>
 26 #include <linux/smp.h>
 27 #include <linux/reboot.h>
 28 #include <linux/delay.h>
 29 #include <linux/pm.h>
 30 #include <linux/slab.h>
 31 #include <linux/cpu.h>
 32 
 33 #include <asm/auxio.h>
 34 #include <asm/oplib.h>
 35 #include <linux/uaccess.h>
 36 #include <asm/page.h>
 37 #include <asm/pgalloc.h>
 38 #include <asm/pgtable.h>
 39 #include <asm/delay.h>
 40 #include <asm/processor.h>
 41 #include <asm/psr.h>
 42 #include <asm/elf.h>
 43 #include <asm/prom.h>
 44 #include <asm/unistd.h>
 45 #include <asm/setup.h>
 46 
 47 #include "kernel.h"
 48 
 49 /* 
 50  * Power management idle function 
 51  * Set in pm platform drivers (apc.c and pmc.c)
 52  */
 53 void (*sparc_idle)(void);
 54 
 55 /* 
 56  * Power-off handler instantiation for pm.h compliance
 57  * This is done via auxio, but could be used as a fallback
 58  * handler when auxio is not present-- unused for now...
 59  */
 60 void (*pm_power_off)(void) = machine_power_off;
 61 EXPORT_SYMBOL(pm_power_off);
 62 
 63 /*
 64  * sysctl - toggle power-off restriction for serial console 
 65  * systems in machine_power_off()
 66  */
 67 int scons_pwroff = 1;
 68 
 69 extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
 70 
 71 struct task_struct *last_task_used_math = NULL;
 72 struct thread_info *current_set[NR_CPUS];
 73 
 74 /* Idle loop support. */
 75 void arch_cpu_idle(void)
 76 {
 77         if (sparc_idle)
 78                 (*sparc_idle)();
 79         local_irq_enable();
 80 }
 81 
 82 /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
 83 void machine_halt(void)
 84 {
 85         local_irq_enable();
 86         mdelay(8);
 87         local_irq_disable();
 88         prom_halt();
 89         panic("Halt failed!");
 90 }
 91 
 92 void machine_restart(char * cmd)
 93 {
 94         char *p;
 95         
 96         local_irq_enable();
 97         mdelay(8);
 98         local_irq_disable();
 99 
100         p = strchr (reboot_command, '\n');
101         if (p) *p = 0;
102         if (cmd)
103                 prom_reboot(cmd);
104         if (*reboot_command)
105                 prom_reboot(reboot_command);
106         prom_feval ("reset");
107         panic("Reboot failed!");
108 }
109 
110 void machine_power_off(void)
111 {
112         if (auxio_power_register &&
113             (strcmp(of_console_device->type, "serial") || scons_pwroff)) {
114                 u8 power_register = sbus_readb(auxio_power_register);
115                 power_register |= AUXIO_POWER_OFF;
116                 sbus_writeb(power_register, auxio_power_register);
117         }
118 
119         machine_halt();
120 }
121 
122 void show_regs(struct pt_regs *r)
123 {
124         struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14];
125 
126         show_regs_print_info(KERN_DEFAULT);
127 
128         printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx    %s\n",
129                r->psr, r->pc, r->npc, r->y, print_tainted());
130         printk("PC: <%pS>\n", (void *) r->pc);
131         printk("%%G: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
132                r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
133                r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
134         printk("%%O: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
135                r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
136                r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
137         printk("RPC: <%pS>\n", (void *) r->u_regs[15]);
138 
139         printk("%%L: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
140                rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
141                rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
142         printk("%%I: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
143                rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
144                rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
145 }
146 
147 /*
148  * The show_stack is an external API which we do not use ourselves.
149  * The oops is printed in die_if_kernel.
150  */
151 void show_stack(struct task_struct *tsk, unsigned long *_ksp)
152 {
153         unsigned long pc, fp;
154         unsigned long task_base;
155         struct reg_window32 *rw;
156         int count = 0;
157 
158         if (!tsk)
159                 tsk = current;
160 
161         if (tsk == current && !_ksp)
162                 __asm__ __volatile__("mov       %%fp, %0" : "=r" (_ksp));
163 
164         task_base = (unsigned long) task_stack_page(tsk);
165         fp = (unsigned long) _ksp;
166         do {
167                 /* Bogus frame pointer? */
168                 if (fp < (task_base + sizeof(struct thread_info)) ||
169                     fp >= (task_base + (PAGE_SIZE << 1)))
170                         break;
171                 rw = (struct reg_window32 *) fp;
172                 pc = rw->ins[7];
173                 printk("[%08lx : ", pc);
174                 printk("%pS ] ", (void *) pc);
175                 fp = rw->ins[6];
176         } while (++count < 16);
177         printk("\n");
178 }
179 
180 /*
181  * Free current thread data structures etc..
182  */
183 void exit_thread(struct task_struct *tsk)
184 {
185 #ifndef CONFIG_SMP
186         if (last_task_used_math == tsk) {
187 #else
188         if (test_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU)) {
189 #endif
190                 /* Keep process from leaving FPU in a bogon state. */
191                 put_psr(get_psr() | PSR_EF);
192                 fpsave(&tsk->thread.float_regs[0], &tsk->thread.fsr,
193                        &tsk->thread.fpqueue[0], &tsk->thread.fpqdepth);
194 #ifndef CONFIG_SMP
195                 last_task_used_math = NULL;
196 #else
197                 clear_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU);
198 #endif
199         }
200 }
201 
202 void flush_thread(void)
203 {
204         current_thread_info()->w_saved = 0;
205 
206 #ifndef CONFIG_SMP
207         if(last_task_used_math == current) {
208 #else
209         if (test_thread_flag(TIF_USEDFPU)) {
210 #endif
211                 /* Clean the fpu. */
212                 put_psr(get_psr() | PSR_EF);
213                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
214                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
215 #ifndef CONFIG_SMP
216                 last_task_used_math = NULL;
217 #else
218                 clear_thread_flag(TIF_USEDFPU);
219 #endif
220         }
221 
222         /* This task is no longer a kernel thread. */
223         if (current->thread.flags & SPARC_FLAG_KTHREAD) {
224                 current->thread.flags &= ~SPARC_FLAG_KTHREAD;
225 
226                 /* We must fixup kregs as well. */
227                 /* XXX This was not fixed for ti for a while, worked. Unused? */
228                 current->thread.kregs = (struct pt_regs *)
229                     (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
230         }
231 }
232 
233 static inline struct sparc_stackf __user *
234 clone_stackframe(struct sparc_stackf __user *dst,
235                  struct sparc_stackf __user *src)
236 {
237         unsigned long size, fp;
238         struct sparc_stackf *tmp;
239         struct sparc_stackf __user *sp;
240 
241         if (get_user(tmp, &src->fp))
242                 return NULL;
243 
244         fp = (unsigned long) tmp;
245         size = (fp - ((unsigned long) src));
246         fp = (unsigned long) dst;
247         sp = (struct sparc_stackf __user *)(fp - size); 
248 
249         /* do_fork() grabs the parent semaphore, we must release it
250          * temporarily so we can build the child clone stack frame
251          * without deadlocking.
252          */
253         if (__copy_user(sp, src, size))
254                 sp = NULL;
255         else if (put_user(fp, &sp->fp))
256                 sp = NULL;
257 
258         return sp;
259 }
260 
261 asmlinkage int sparc_do_fork(unsigned long clone_flags,
262                              unsigned long stack_start,
263                              struct pt_regs *regs,
264                              unsigned long stack_size)
265 {
266         unsigned long parent_tid_ptr, child_tid_ptr;
267         unsigned long orig_i1 = regs->u_regs[UREG_I1];
268         long ret;
269 
270         parent_tid_ptr = regs->u_regs[UREG_I2];
271         child_tid_ptr = regs->u_regs[UREG_I4];
272 
273         ret = do_fork(clone_flags, stack_start, stack_size,
274                       (int __user *) parent_tid_ptr,
275                       (int __user *) child_tid_ptr);
276 
277         /* If we get an error and potentially restart the system
278          * call, we're screwed because copy_thread() clobbered
279          * the parent's %o1.  So detect that case and restore it
280          * here.
281          */
282         if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
283                 regs->u_regs[UREG_I1] = orig_i1;
284 
285         return ret;
286 }
287 
288 /* Copy a Sparc thread.  The fork() return value conventions
289  * under SunOS are nothing short of bletcherous:
290  * Parent -->  %o0 == childs  pid, %o1 == 0
291  * Child  -->  %o0 == parents pid, %o1 == 1
292  *
293  * NOTE: We have a separate fork kpsr/kwim because
294  *       the parent could change these values between
295  *       sys_fork invocation and when we reach here
296  *       if the parent should sleep while trying to
297  *       allocate the task_struct and kernel stack in
298  *       do_fork().
299  * XXX See comment above sys_vfork in sparc64. todo.
300  */
301 extern void ret_from_fork(void);
302 extern void ret_from_kernel_thread(void);
303 
304 int copy_thread(unsigned long clone_flags, unsigned long sp,
305                 unsigned long arg, struct task_struct *p)
306 {
307         struct thread_info *ti = task_thread_info(p);
308         struct pt_regs *childregs, *regs = current_pt_regs();
309         char *new_stack;
310 
311 #ifndef CONFIG_SMP
312         if(last_task_used_math == current) {
313 #else
314         if (test_thread_flag(TIF_USEDFPU)) {
315 #endif
316                 put_psr(get_psr() | PSR_EF);
317                 fpsave(&p->thread.float_regs[0], &p->thread.fsr,
318                        &p->thread.fpqueue[0], &p->thread.fpqdepth);
319         }
320 
321         /*
322          *  p->thread_info         new_stack   childregs stack bottom
323          *  !                      !           !             !
324          *  V                      V (stk.fr.) V  (pt_regs)  V
325          *  +----- - - - - - ------+===========+=============+
326          */
327         new_stack = task_stack_page(p) + THREAD_SIZE;
328         new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
329         childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
330 
331         /*
332          * A new process must start with interrupts disabled, see schedule_tail()
333          * and finish_task_switch(). (If we do not do it and if a timer interrupt
334          * hits before we unlock and attempts to take the rq->lock, we deadlock.)
335          *
336          * Thus, kpsr |= PSR_PIL.
337          */
338         ti->ksp = (unsigned long) new_stack;
339         p->thread.kregs = childregs;
340 
341         if (unlikely(p->flags & PF_KTHREAD)) {
342                 extern int nwindows;
343                 unsigned long psr;
344                 memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ);
345                 p->thread.flags |= SPARC_FLAG_KTHREAD;
346                 p->thread.current_ds = KERNEL_DS;
347                 ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8);
348                 childregs->u_regs[UREG_G1] = sp; /* function */
349                 childregs->u_regs[UREG_G2] = arg;
350                 psr = childregs->psr = get_psr();
351                 ti->kpsr = psr | PSR_PIL;
352                 ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows);
353                 return 0;
354         }
355         memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
356         childregs->u_regs[UREG_FP] = sp;
357         p->thread.flags &= ~SPARC_FLAG_KTHREAD;
358         p->thread.current_ds = USER_DS;
359         ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
360         ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
361         ti->kwim = current->thread.fork_kwim;
362 
363         if (sp != regs->u_regs[UREG_FP]) {
364                 struct sparc_stackf __user *childstack;
365                 struct sparc_stackf __user *parentstack;
366 
367                 /*
368                  * This is a clone() call with supplied user stack.
369                  * Set some valid stack frames to give to the child.
370                  */
371                 childstack = (struct sparc_stackf __user *)
372                         (sp & ~0xfUL);
373                 parentstack = (struct sparc_stackf __user *)
374                         regs->u_regs[UREG_FP];
375 
376 #if 0
377                 printk("clone: parent stack:\n");
378                 show_stackframe(parentstack);
379 #endif
380 
381                 childstack = clone_stackframe(childstack, parentstack);
382                 if (!childstack)
383                         return -EFAULT;
384 
385 #if 0
386                 printk("clone: child stack:\n");
387                 show_stackframe(childstack);
388 #endif
389 
390                 childregs->u_regs[UREG_FP] = (unsigned long)childstack;
391         }
392 
393 #ifdef CONFIG_SMP
394         /* FPU must be disabled on SMP. */
395         childregs->psr &= ~PSR_EF;
396         clear_tsk_thread_flag(p, TIF_USEDFPU);
397 #endif
398 
399         /* Set the return value for the child. */
400         childregs->u_regs[UREG_I0] = current->pid;
401         childregs->u_regs[UREG_I1] = 1;
402 
403         /* Set the return value for the parent. */
404         regs->u_regs[UREG_I1] = 0;
405 
406         if (clone_flags & CLONE_SETTLS)
407                 childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
408 
409         return 0;
410 }
411 
412 /*
413  * fill in the fpu structure for a core dump.
414  */
415 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
416 {
417         if (used_math()) {
418                 memset(fpregs, 0, sizeof(*fpregs));
419                 fpregs->pr_q_entrysize = 8;
420                 return 1;
421         }
422 #ifdef CONFIG_SMP
423         if (test_thread_flag(TIF_USEDFPU)) {
424                 put_psr(get_psr() | PSR_EF);
425                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
426                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
427                 if (regs != NULL) {
428                         regs->psr &= ~(PSR_EF);
429                         clear_thread_flag(TIF_USEDFPU);
430                 }
431         }
432 #else
433         if (current == last_task_used_math) {
434                 put_psr(get_psr() | PSR_EF);
435                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
436                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
437                 if (regs != NULL) {
438                         regs->psr &= ~(PSR_EF);
439                         last_task_used_math = NULL;
440                 }
441         }
442 #endif
443         memcpy(&fpregs->pr_fr.pr_regs[0],
444                &current->thread.float_regs[0],
445                (sizeof(unsigned long) * 32));
446         fpregs->pr_fsr = current->thread.fsr;
447         fpregs->pr_qcnt = current->thread.fpqdepth;
448         fpregs->pr_q_entrysize = 8;
449         fpregs->pr_en = 1;
450         if(fpregs->pr_qcnt != 0) {
451                 memcpy(&fpregs->pr_q[0],
452                        &current->thread.fpqueue[0],
453                        sizeof(struct fpq) * fpregs->pr_qcnt);
454         }
455         /* Zero out the rest. */
456         memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
457                sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
458         return 1;
459 }
460 
461 unsigned long get_wchan(struct task_struct *task)
462 {
463         unsigned long pc, fp, bias = 0;
464         unsigned long task_base = (unsigned long) task;
465         unsigned long ret = 0;
466         struct reg_window32 *rw;
467         int count = 0;
468 
469         if (!task || task == current ||
470             task->state == TASK_RUNNING)
471                 goto out;
472 
473         fp = task_thread_info(task)->ksp + bias;
474         do {
475                 /* Bogus frame pointer? */
476                 if (fp < (task_base + sizeof(struct thread_info)) ||
477                     fp >= (task_base + (2 * PAGE_SIZE)))
478                         break;
479                 rw = (struct reg_window32 *) fp;
480                 pc = rw->ins[7];
481                 if (!in_sched_functions(pc)) {
482                         ret = pc;
483                         goto out;
484                 }
485                 fp = rw->ins[6] + bias;
486         } while (++count < 16);
487 
488 out:
489         return ret;
490 }
491 
492 

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