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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/sched/debug.h>
 17 #include <linux/sched/task.h>
 18 #include <linux/sched/task_stack.h>
 19 #include <linux/kernel.h>
 20 #include <linux/mm.h>
 21 #include <linux/slab.h>
 22 #include <linux/fs.h>
 23 #include <linux/smp.h>
 24 #include <linux/stddef.h>
 25 #include <linux/unistd.h>
 26 #include <linux/ptrace.h>
 27 #include <linux/user.h>
 28 #include <linux/reboot.h>
 29 #include <linux/init_task.h>
 30 #include <linux/mqueue.h>
 31 #include <linux/rcupdate.h>
 32 
 33 #include <linux/uaccess.h>
 34 #include <asm/traps.h>
 35 #include <asm/machdep.h>
 36 #include <asm/setup.h>
 37 #include <asm/pgtable.h>
 38 
 39 
 40 asmlinkage void ret_from_fork(void);
 41 asmlinkage void ret_from_kernel_thread(void);
 42 
 43 void arch_cpu_idle(void)
 44 {
 45 #if defined(MACH_ATARI_ONLY)
 46         /* block out HSYNC on the atari (falcon) */
 47         __asm__("stop #0x2200" : : : "cc");
 48 #else
 49         __asm__("stop #0x2000" : : : "cc");
 50 #endif
 51 }
 52 
 53 void machine_restart(char * __unused)
 54 {
 55         if (mach_reset)
 56                 mach_reset();
 57         for (;;);
 58 }
 59 
 60 void machine_halt(void)
 61 {
 62         if (mach_halt)
 63                 mach_halt();
 64         for (;;);
 65 }
 66 
 67 void machine_power_off(void)
 68 {
 69         if (mach_power_off)
 70                 mach_power_off();
 71         for (;;);
 72 }
 73 
 74 void (*pm_power_off)(void) = machine_power_off;
 75 EXPORT_SYMBOL(pm_power_off);
 76 
 77 void show_regs(struct pt_regs * regs)
 78 {
 79         pr_info("Format %02x  Vector: %04x  PC: %08lx  Status: %04x    %s\n",
 80                 regs->format, regs->vector, regs->pc, regs->sr,
 81                 print_tainted());
 82         pr_info("ORIG_D0: %08lx  D0: %08lx  A2: %08lx  A1: %08lx\n",
 83                 regs->orig_d0, regs->d0, regs->a2, regs->a1);
 84         pr_info("A0: %08lx  D5: %08lx  D4: %08lx\n", regs->a0, regs->d5,
 85                 regs->d4);
 86         pr_info("D3: %08lx  D2: %08lx  D1: %08lx\n", regs->d3, regs->d2,
 87                 regs->d1);
 88         if (!(regs->sr & PS_S))
 89                 pr_info("USP: %08lx\n", rdusp());
 90 }
 91 
 92 void flush_thread(void)
 93 {
 94         current->thread.fs = __USER_DS;
 95 #ifdef CONFIG_FPU
 96         if (!FPU_IS_EMU) {
 97                 unsigned long zero = 0;
 98                 asm volatile("frestore %0": :"m" (zero));
 99         }
100 #endif
101 }
102 
103 /*
104  * Why not generic sys_clone, you ask?  m68k passes all arguments on stack.
105  * And we need all registers saved, which means a bunch of stuff pushed
106  * on top of pt_regs, which means that sys_clone() arguments would be
107  * buried.  We could, of course, copy them, but it's too costly for no
108  * good reason - generic clone() would have to copy them *again* for
109  * do_fork() anyway.  So in this case it's actually better to pass pt_regs *
110  * and extract arguments for do_fork() from there.  Eventually we might
111  * go for calling do_fork() directly from the wrapper, but only after we
112  * are finished with do_fork() prototype conversion.
113  */
114 asmlinkage int m68k_clone(struct pt_regs *regs)
115 {
116         /* regs will be equal to current_pt_regs() */
117         return do_fork(regs->d1, regs->d2, 0,
118                        (int __user *)regs->d3, (int __user *)regs->d4);
119 }
120 
121 int copy_thread(unsigned long clone_flags, unsigned long usp,
122                  unsigned long arg, struct task_struct *p)
123 {
124         struct fork_frame {
125                 struct switch_stack sw;
126                 struct pt_regs regs;
127         } *frame;
128 
129         frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1;
130 
131         p->thread.ksp = (unsigned long)frame;
132         p->thread.esp0 = (unsigned long)&frame->regs;
133 
134         /*
135          * Must save the current SFC/DFC value, NOT the value when
136          * the parent was last descheduled - RGH  10-08-96
137          */
138         p->thread.fs = get_fs().seg;
139 
140         if (unlikely(p->flags & PF_KTHREAD)) {
141                 /* kernel thread */
142                 memset(frame, 0, sizeof(struct fork_frame));
143                 frame->regs.sr = PS_S;
144                 frame->sw.a3 = usp; /* function */
145                 frame->sw.d7 = arg;
146                 frame->sw.retpc = (unsigned long)ret_from_kernel_thread;
147                 p->thread.usp = 0;
148                 return 0;
149         }
150         memcpy(frame, container_of(current_pt_regs(), struct fork_frame, regs),
151                 sizeof(struct fork_frame));
152         frame->regs.d0 = 0;
153         frame->sw.retpc = (unsigned long)ret_from_fork;
154         p->thread.usp = usp ?: rdusp();
155 
156         if (clone_flags & CLONE_SETTLS)
157                 task_thread_info(p)->tp_value = frame->regs.d5;
158 
159 #ifdef CONFIG_FPU
160         if (!FPU_IS_EMU) {
161                 /* Copy the current fpu state */
162                 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
163 
164                 if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
165                         if (CPU_IS_COLDFIRE) {
166                                 asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
167                                               "fmovel %/fpiar,%1\n\t"
168                                               "fmovel %/fpcr,%2\n\t"
169                                               "fmovel %/fpsr,%3"
170                                               :
171                                               : "m" (p->thread.fp[0]),
172                                                 "m" (p->thread.fpcntl[0]),
173                                                 "m" (p->thread.fpcntl[1]),
174                                                 "m" (p->thread.fpcntl[2])
175                                               : "memory");
176                         } else {
177                                 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
178                                               "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
179                                               :
180                                               : "m" (p->thread.fp[0]),
181                                                 "m" (p->thread.fpcntl[0])
182                                               : "memory");
183                         }
184                 }
185 
186                 /* Restore the state in case the fpu was busy */
187                 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
188         }
189 #endif /* CONFIG_FPU */
190 
191         return 0;
192 }
193 
194 /* Fill in the fpu structure for a core dump.  */
195 int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
196 {
197         if (FPU_IS_EMU) {
198                 int i;
199 
200                 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
201                 memcpy(fpu->fpregs, current->thread.fp, 96);
202                 /* Convert internal fpu reg representation
203                  * into long double format
204                  */
205                 for (i = 0; i < 24; i += 3)
206                         fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
207                                          ((fpu->fpregs[i] & 0x0000ffff) << 16);
208                 return 1;
209         }
210 
211         if (IS_ENABLED(CONFIG_FPU)) {
212                 char fpustate[216];
213 
214                 /* First dump the fpu context to avoid protocol violation.  */
215                 asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
216                 if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
217                         return 0;
218 
219                 if (CPU_IS_COLDFIRE) {
220                         asm volatile ("fmovel %/fpiar,%0\n\t"
221                                       "fmovel %/fpcr,%1\n\t"
222                                       "fmovel %/fpsr,%2\n\t"
223                                       "fmovemd %/fp0-%/fp7,%3"
224                                       :
225                                       : "m" (fpu->fpcntl[0]),
226                                         "m" (fpu->fpcntl[1]),
227                                         "m" (fpu->fpcntl[2]),
228                                         "m" (fpu->fpregs[0])
229                                       : "memory");
230                 } else {
231                         asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
232                                       :
233                                       : "m" (fpu->fpcntl[0])
234                                       : "memory");
235                         asm volatile ("fmovemx %/fp0-%/fp7,%0"
236                                       :
237                                       : "m" (fpu->fpregs[0])
238                                       : "memory");
239                 }
240         }
241 
242         return 1;
243 }
244 EXPORT_SYMBOL(dump_fpu);
245 
246 unsigned long get_wchan(struct task_struct *p)
247 {
248         unsigned long fp, pc;
249         unsigned long stack_page;
250         int count = 0;
251         if (!p || p == current || p->state == TASK_RUNNING)
252                 return 0;
253 
254         stack_page = (unsigned long)task_stack_page(p);
255         fp = ((struct switch_stack *)p->thread.ksp)->a6;
256         do {
257                 if (fp < stack_page+sizeof(struct thread_info) ||
258                     fp >= 8184+stack_page)
259                         return 0;
260                 pc = ((unsigned long *)fp)[1];
261                 if (!in_sched_functions(pc))
262                         return pc;
263                 fp = *(unsigned long *) fp;
264         } while (count++ < 16);
265         return 0;
266 }
267 

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