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Linux/arch/m68k/kernel/process.c

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  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 asmlinkage void ret_from_kernel_thread(void);
 39 
 40 
 41 /*
 42  * Return saved PC from a blocked thread
 43  */
 44 unsigned long thread_saved_pc(struct task_struct *tsk)
 45 {
 46         struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
 47         /* Check whether the thread is blocked in resume() */
 48         if (in_sched_functions(sw->retpc))
 49                 return ((unsigned long *)sw->a6)[1];
 50         else
 51                 return sw->retpc;
 52 }
 53 
 54 void arch_cpu_idle(void)
 55 {
 56 #if defined(MACH_ATARI_ONLY)
 57         /* block out HSYNC on the atari (falcon) */
 58         __asm__("stop #0x2200" : : : "cc");
 59 #else
 60         __asm__("stop #0x2000" : : : "cc");
 61 #endif
 62 }
 63 
 64 void machine_restart(char * __unused)
 65 {
 66         if (mach_reset)
 67                 mach_reset();
 68         for (;;);
 69 }
 70 
 71 void machine_halt(void)
 72 {
 73         if (mach_halt)
 74                 mach_halt();
 75         for (;;);
 76 }
 77 
 78 void machine_power_off(void)
 79 {
 80         if (mach_power_off)
 81                 mach_power_off();
 82         for (;;);
 83 }
 84 
 85 void (*pm_power_off)(void) = machine_power_off;
 86 EXPORT_SYMBOL(pm_power_off);
 87 
 88 void show_regs(struct pt_regs * regs)
 89 {
 90         printk("\n");
 91         printk("Format %02x  Vector: %04x  PC: %08lx  Status: %04x    %s\n",
 92                regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
 93         printk("ORIG_D0: %08lx  D0: %08lx  A2: %08lx  A1: %08lx\n",
 94                regs->orig_d0, regs->d0, regs->a2, regs->a1);
 95         printk("A0: %08lx  D5: %08lx  D4: %08lx\n",
 96                regs->a0, regs->d5, regs->d4);
 97         printk("D3: %08lx  D2: %08lx  D1: %08lx\n",
 98                regs->d3, regs->d2, regs->d1);
 99         if (!(regs->sr & PS_S))
100                 printk("USP: %08lx\n", rdusp());
101 }
102 
103 void flush_thread(void)
104 {
105         current->thread.fs = __USER_DS;
106 #ifdef CONFIG_FPU
107         if (!FPU_IS_EMU) {
108                 unsigned long zero = 0;
109                 asm volatile("frestore %0": :"m" (zero));
110         }
111 #endif
112 }
113 
114 /*
115  * Why not generic sys_clone, you ask?  m68k passes all arguments on stack.
116  * And we need all registers saved, which means a bunch of stuff pushed
117  * on top of pt_regs, which means that sys_clone() arguments would be
118  * buried.  We could, of course, copy them, but it's too costly for no
119  * good reason - generic clone() would have to copy them *again* for
120  * do_fork() anyway.  So in this case it's actually better to pass pt_regs *
121  * and extract arguments for do_fork() from there.  Eventually we might
122  * go for calling do_fork() directly from the wrapper, but only after we
123  * are finished with do_fork() prototype conversion.
124  */
125 asmlinkage int m68k_clone(struct pt_regs *regs)
126 {
127         /* regs will be equal to current_pt_regs() */
128         return do_fork(regs->d1, regs->d2, 0,
129                        (int __user *)regs->d3, (int __user *)regs->d4);
130 }
131 
132 int copy_thread(unsigned long clone_flags, unsigned long usp,
133                  unsigned long arg, struct task_struct *p)
134 {
135         struct fork_frame {
136                 struct switch_stack sw;
137                 struct pt_regs regs;
138         } *frame;
139 
140         frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1;
141 
142         p->thread.ksp = (unsigned long)frame;
143         p->thread.esp0 = (unsigned long)&frame->regs;
144 
145         /*
146          * Must save the current SFC/DFC value, NOT the value when
147          * the parent was last descheduled - RGH  10-08-96
148          */
149         p->thread.fs = get_fs().seg;
150 
151         if (unlikely(p->flags & PF_KTHREAD)) {
152                 /* kernel thread */
153                 memset(frame, 0, sizeof(struct fork_frame));
154                 frame->regs.sr = PS_S;
155                 frame->sw.a3 = usp; /* function */
156                 frame->sw.d7 = arg;
157                 frame->sw.retpc = (unsigned long)ret_from_kernel_thread;
158                 p->thread.usp = 0;
159                 return 0;
160         }
161         memcpy(frame, container_of(current_pt_regs(), struct fork_frame, regs),
162                 sizeof(struct fork_frame));
163         frame->regs.d0 = 0;
164         frame->sw.retpc = (unsigned long)ret_from_fork;
165         p->thread.usp = usp ?: rdusp();
166 
167         if (clone_flags & CLONE_SETTLS)
168                 task_thread_info(p)->tp_value = frame->regs.d5;
169 
170 #ifdef CONFIG_FPU
171         if (!FPU_IS_EMU) {
172                 /* Copy the current fpu state */
173                 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
174 
175                 if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
176                         if (CPU_IS_COLDFIRE) {
177                                 asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
178                                               "fmovel %/fpiar,%1\n\t"
179                                               "fmovel %/fpcr,%2\n\t"
180                                               "fmovel %/fpsr,%3"
181                                               :
182                                               : "m" (p->thread.fp[0]),
183                                                 "m" (p->thread.fpcntl[0]),
184                                                 "m" (p->thread.fpcntl[1]),
185                                                 "m" (p->thread.fpcntl[2])
186                                               : "memory");
187                         } else {
188                                 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
189                                               "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
190                                               :
191                                               : "m" (p->thread.fp[0]),
192                                                 "m" (p->thread.fpcntl[0])
193                                               : "memory");
194                         }
195                 }
196 
197                 /* Restore the state in case the fpu was busy */
198                 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
199         }
200 #endif /* CONFIG_FPU */
201 
202         return 0;
203 }
204 
205 /* Fill in the fpu structure for a core dump.  */
206 #ifdef CONFIG_FPU
207 int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
208 {
209         char fpustate[216];
210 
211         if (FPU_IS_EMU) {
212                 int i;
213 
214                 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
215                 memcpy(fpu->fpregs, current->thread.fp, 96);
216                 /* Convert internal fpu reg representation
217                  * into long double format
218                  */
219                 for (i = 0; i < 24; i += 3)
220                         fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
221                                          ((fpu->fpregs[i] & 0x0000ffff) << 16);
222                 return 1;
223         }
224 
225         /* First dump the fpu context to avoid protocol violation.  */
226         asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
227         if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
228                 return 0;
229 
230         if (CPU_IS_COLDFIRE) {
231                 asm volatile ("fmovel %/fpiar,%0\n\t"
232                               "fmovel %/fpcr,%1\n\t"
233                               "fmovel %/fpsr,%2\n\t"
234                               "fmovemd %/fp0-%/fp7,%3"
235                               :
236                               : "m" (fpu->fpcntl[0]),
237                                 "m" (fpu->fpcntl[1]),
238                                 "m" (fpu->fpcntl[2]),
239                                 "m" (fpu->fpregs[0])
240                               : "memory");
241         } else {
242                 asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
243                               :
244                               : "m" (fpu->fpcntl[0])
245                               : "memory");
246                 asm volatile ("fmovemx %/fp0-%/fp7,%0"
247                               :
248                               : "m" (fpu->fpregs[0])
249                               : "memory");
250         }
251 
252         return 1;
253 }
254 EXPORT_SYMBOL(dump_fpu);
255 #endif /* CONFIG_FPU */
256 
257 unsigned long get_wchan(struct task_struct *p)
258 {
259         unsigned long fp, pc;
260         unsigned long stack_page;
261         int count = 0;
262         if (!p || p == current || p->state == TASK_RUNNING)
263                 return 0;
264 
265         stack_page = (unsigned long)task_stack_page(p);
266         fp = ((struct switch_stack *)p->thread.ksp)->a6;
267         do {
268                 if (fp < stack_page+sizeof(struct thread_info) ||
269                     fp >= 8184+stack_page)
270                         return 0;
271                 pc = ((unsigned long *)fp)[1];
272                 if (!in_sched_functions(pc))
273                         return pc;
274                 fp = *(unsigned long *) fp;
275         } while (count++ < 16);
276         return 0;
277 }
278 

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