~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/m68k/kernel/process.c

Version: ~ [ linux-5.5-rc7 ] ~ [ linux-5.4.13 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.97 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.166 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.210 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.210 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  linux/arch/m68k/kernel/process.c
  3  *
  4  *  Copyright (C) 1995  Hamish Macdonald
  5  *
  6  *  68060 fixes by Jesper Skov
  7  */
  8 
  9 /*
 10  * This file handles the architecture-dependent parts of process handling..
 11  */
 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/slab.h>
 19 #include <linux/fs.h>
 20 #include <linux/smp.h>
 21 #include <linux/stddef.h>
 22 #include <linux/unistd.h>
 23 #include <linux/ptrace.h>
 24 #include <linux/user.h>
 25 #include <linux/reboot.h>
 26 #include <linux/init_task.h>
 27 #include <linux/mqueue.h>
 28 #include <linux/rcupdate.h>
 29 
 30 #include <asm/uaccess.h>
 31 #include <asm/traps.h>
 32 #include <asm/machdep.h>
 33 #include <asm/setup.h>
 34 #include <asm/pgtable.h>
 35 
 36 
 37 asmlinkage void ret_from_fork(void);
 38 
 39 
 40 /*
 41  * Return saved PC from a blocked thread
 42  */
 43 unsigned long thread_saved_pc(struct task_struct *tsk)
 44 {
 45         struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
 46         /* Check whether the thread is blocked in resume() */
 47         if (in_sched_functions(sw->retpc))
 48                 return ((unsigned long *)sw->a6)[1];
 49         else
 50                 return sw->retpc;
 51 }
 52 
 53 /*
 54  * The idle loop on an m68k..
 55  */
 56 static void default_idle(void)
 57 {
 58         if (!need_resched())
 59 #if defined(MACH_ATARI_ONLY)
 60                 /* block out HSYNC on the atari (falcon) */
 61                 __asm__("stop #0x2200" : : : "cc");
 62 #else
 63                 __asm__("stop #0x2000" : : : "cc");
 64 #endif
 65 }
 66 
 67 void (*idle)(void) = default_idle;
 68 
 69 /*
 70  * The idle thread. There's no useful work to be
 71  * done, so just try to conserve power and have a
 72  * low exit latency (ie sit in a loop waiting for
 73  * somebody to say that they'd like to reschedule)
 74  */
 75 void cpu_idle(void)
 76 {
 77         /* endless idle loop with no priority at all */
 78         while (1) {
 79                 rcu_idle_enter();
 80                 while (!need_resched())
 81                         idle();
 82                 rcu_idle_exit();
 83                 schedule_preempt_disabled();
 84         }
 85 }
 86 
 87 void machine_restart(char * __unused)
 88 {
 89         if (mach_reset)
 90                 mach_reset();
 91         for (;;);
 92 }
 93 
 94 void machine_halt(void)
 95 {
 96         if (mach_halt)
 97                 mach_halt();
 98         for (;;);
 99 }
100 
101 void machine_power_off(void)
102 {
103         if (mach_power_off)
104                 mach_power_off();
105         for (;;);
106 }
107 
108 void (*pm_power_off)(void) = machine_power_off;
109 EXPORT_SYMBOL(pm_power_off);
110 
111 void show_regs(struct pt_regs * regs)
112 {
113         printk("\n");
114         printk("Format %02x  Vector: %04x  PC: %08lx  Status: %04x    %s\n",
115                regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
116         printk("ORIG_D0: %08lx  D0: %08lx  A2: %08lx  A1: %08lx\n",
117                regs->orig_d0, regs->d0, regs->a2, regs->a1);
118         printk("A0: %08lx  D5: %08lx  D4: %08lx\n",
119                regs->a0, regs->d5, regs->d4);
120         printk("D3: %08lx  D2: %08lx  D1: %08lx\n",
121                regs->d3, regs->d2, regs->d1);
122         if (!(regs->sr & PS_S))
123                 printk("USP: %08lx\n", rdusp());
124 }
125 
126 /*
127  * Create a kernel thread
128  */
129 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
130 {
131         int pid;
132         mm_segment_t fs;
133 
134         fs = get_fs();
135         set_fs (KERNEL_DS);
136 
137         {
138         register long retval __asm__ ("d0");
139         register long clone_arg __asm__ ("d1") = flags | CLONE_VM | CLONE_UNTRACED;
140 
141         retval = __NR_clone;
142         __asm__ __volatile__
143           ("clrl %%d2\n\t"
144            "trap #0\n\t"                /* Linux/m68k system call */
145            "tstl %0\n\t"                /* child or parent */
146            "jne 1f\n\t"                 /* parent - jump */
147 #ifdef CONFIG_MMU
148            "lea %%sp@(%c7),%6\n\t"      /* reload current */
149            "movel %6@,%6\n\t"
150 #endif
151            "movel %3,%%sp@-\n\t"        /* push argument */
152            "jsr %4@\n\t"                /* call fn */
153            "movel %0,%%d1\n\t"          /* pass exit value */
154            "movel %2,%%d0\n\t"          /* exit */
155            "trap #0\n"
156            "1:"
157            : "+d" (retval)
158            : "i" (__NR_clone), "i" (__NR_exit),
159              "r" (arg), "a" (fn), "d" (clone_arg), "r" (current),
160              "i" (-THREAD_SIZE)
161            : "d2");
162 
163         pid = retval;
164         }
165 
166         set_fs (fs);
167         return pid;
168 }
169 EXPORT_SYMBOL(kernel_thread);
170 
171 void flush_thread(void)
172 {
173         current->thread.fs = __USER_DS;
174 #ifdef CONFIG_FPU
175         if (!FPU_IS_EMU) {
176                 unsigned long zero = 0;
177                 asm volatile("frestore %0": :"m" (zero));
178         }
179 #endif
180 }
181 
182 /*
183  * "m68k_fork()".. By the time we get here, the
184  * non-volatile registers have also been saved on the
185  * stack. We do some ugly pointer stuff here.. (see
186  * also copy_thread)
187  */
188 
189 asmlinkage int m68k_fork(struct pt_regs *regs)
190 {
191 #ifdef CONFIG_MMU
192         return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
193 #else
194         return -EINVAL;
195 #endif
196 }
197 
198 asmlinkage int m68k_vfork(struct pt_regs *regs)
199 {
200         return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0,
201                        NULL, NULL);
202 }
203 
204 asmlinkage int m68k_clone(struct pt_regs *regs)
205 {
206         unsigned long clone_flags;
207         unsigned long newsp;
208         int __user *parent_tidptr, *child_tidptr;
209 
210         /* syscall2 puts clone_flags in d1 and usp in d2 */
211         clone_flags = regs->d1;
212         newsp = regs->d2;
213         parent_tidptr = (int __user *)regs->d3;
214         child_tidptr = (int __user *)regs->d4;
215         if (!newsp)
216                 newsp = rdusp();
217         return do_fork(clone_flags, newsp, regs, 0,
218                        parent_tidptr, child_tidptr);
219 }
220 
221 int copy_thread(unsigned long clone_flags, unsigned long usp,
222                  unsigned long unused,
223                  struct task_struct * p, struct pt_regs * regs)
224 {
225         struct pt_regs * childregs;
226         struct switch_stack * childstack, *stack;
227         unsigned long *retp;
228 
229         childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
230 
231         *childregs = *regs;
232         childregs->d0 = 0;
233 
234         retp = ((unsigned long *) regs);
235         stack = ((struct switch_stack *) retp) - 1;
236 
237         childstack = ((struct switch_stack *) childregs) - 1;
238         *childstack = *stack;
239         childstack->retpc = (unsigned long)ret_from_fork;
240 
241         p->thread.usp = usp;
242         p->thread.ksp = (unsigned long)childstack;
243 
244         if (clone_flags & CLONE_SETTLS)
245                 task_thread_info(p)->tp_value = regs->d5;
246 
247         /*
248          * Must save the current SFC/DFC value, NOT the value when
249          * the parent was last descheduled - RGH  10-08-96
250          */
251         p->thread.fs = get_fs().seg;
252 
253 #ifdef CONFIG_FPU
254         if (!FPU_IS_EMU) {
255                 /* Copy the current fpu state */
256                 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
257 
258                 if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
259                         if (CPU_IS_COLDFIRE) {
260                                 asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
261                                               "fmovel %/fpiar,%1\n\t"
262                                               "fmovel %/fpcr,%2\n\t"
263                                               "fmovel %/fpsr,%3"
264                                               :
265                                               : "m" (p->thread.fp[0]),
266                                                 "m" (p->thread.fpcntl[0]),
267                                                 "m" (p->thread.fpcntl[1]),
268                                                 "m" (p->thread.fpcntl[2])
269                                               : "memory");
270                         } else {
271                                 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
272                                               "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
273                                               :
274                                               : "m" (p->thread.fp[0]),
275                                                 "m" (p->thread.fpcntl[0])
276                                               : "memory");
277                         }
278                 }
279 
280                 /* Restore the state in case the fpu was busy */
281                 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
282         }
283 #endif /* CONFIG_FPU */
284 
285         return 0;
286 }
287 
288 /* Fill in the fpu structure for a core dump.  */
289 #ifdef CONFIG_FPU
290 int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
291 {
292         char fpustate[216];
293 
294         if (FPU_IS_EMU) {
295                 int i;
296 
297                 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
298                 memcpy(fpu->fpregs, current->thread.fp, 96);
299                 /* Convert internal fpu reg representation
300                  * into long double format
301                  */
302                 for (i = 0; i < 24; i += 3)
303                         fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
304                                          ((fpu->fpregs[i] & 0x0000ffff) << 16);
305                 return 1;
306         }
307 
308         /* First dump the fpu context to avoid protocol violation.  */
309         asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
310         if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
311                 return 0;
312 
313         if (CPU_IS_COLDFIRE) {
314                 asm volatile ("fmovel %/fpiar,%0\n\t"
315                               "fmovel %/fpcr,%1\n\t"
316                               "fmovel %/fpsr,%2\n\t"
317                               "fmovemd %/fp0-%/fp7,%3"
318                               :
319                               : "m" (fpu->fpcntl[0]),
320                                 "m" (fpu->fpcntl[1]),
321                                 "m" (fpu->fpcntl[2]),
322                                 "m" (fpu->fpregs[0])
323                               : "memory");
324         } else {
325                 asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
326                               :
327                               : "m" (fpu->fpcntl[0])
328                               : "memory");
329                 asm volatile ("fmovemx %/fp0-%/fp7,%0"
330                               :
331                               : "m" (fpu->fpregs[0])
332                               : "memory");
333         }
334 
335         return 1;
336 }
337 EXPORT_SYMBOL(dump_fpu);
338 #endif /* CONFIG_FPU */
339 
340 /*
341  * sys_execve() executes a new program.
342  */
343 asmlinkage int sys_execve(const char __user *name,
344                           const char __user *const __user *argv,
345                           const char __user *const __user *envp)
346 {
347         int error;
348         char * filename;
349         struct pt_regs *regs = (struct pt_regs *) &name;
350 
351         filename = getname(name);
352         error = PTR_ERR(filename);
353         if (IS_ERR(filename))
354                 return error;
355         error = do_execve(filename, argv, envp, regs);
356         putname(filename);
357         return error;
358 }
359 
360 unsigned long get_wchan(struct task_struct *p)
361 {
362         unsigned long fp, pc;
363         unsigned long stack_page;
364         int count = 0;
365         if (!p || p == current || p->state == TASK_RUNNING)
366                 return 0;
367 
368         stack_page = (unsigned long)task_stack_page(p);
369         fp = ((struct switch_stack *)p->thread.ksp)->a6;
370         do {
371                 if (fp < stack_page+sizeof(struct thread_info) ||
372                     fp >= 8184+stack_page)
373                         return 0;
374                 pc = ((unsigned long *)fp)[1];
375                 if (!in_sched_functions(pc))
376                         return pc;
377                 fp = *(unsigned long *) fp;
378         } while (count++ < 16);
379         return 0;
380 }
381 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp