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Linux/arch/m68k/kernel/process.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  linux/arch/m68k/kernel/process.c
  4  *
  5  *  Copyright (C) 1995  Hamish Macdonald
  6  *
  7  *  68060 fixes by Jesper Skov
  8  */
  9 
 10 /*
 11  * This file handles the architecture-dependent parts of process handling..
 12  */
 13 
 14 #include <linux/errno.h>
 15 #include <linux/module.h>
 16 #include <linux/sched.h>
 17 #include <linux/sched/debug.h>
 18 #include <linux/sched/task.h>
 19 #include <linux/sched/task_stack.h>
 20 #include <linux/kernel.h>
 21 #include <linux/mm.h>
 22 #include <linux/slab.h>
 23 #include <linux/fs.h>
 24 #include <linux/smp.h>
 25 #include <linux/stddef.h>
 26 #include <linux/unistd.h>
 27 #include <linux/ptrace.h>
 28 #include <linux/user.h>
 29 #include <linux/reboot.h>
 30 #include <linux/init_task.h>
 31 #include <linux/mqueue.h>
 32 #include <linux/rcupdate.h>
 33 
 34 #include <linux/uaccess.h>
 35 #include <asm/traps.h>
 36 #include <asm/machdep.h>
 37 #include <asm/setup.h>
 38 #include <asm/pgtable.h>
 39 
 40 
 41 asmlinkage void ret_from_fork(void);
 42 asmlinkage void ret_from_kernel_thread(void);
 43 
 44 void arch_cpu_idle(void)
 45 {
 46 #if defined(MACH_ATARI_ONLY)
 47         /* block out HSYNC on the atari (falcon) */
 48         __asm__("stop #0x2200" : : : "cc");
 49 #else
 50         __asm__("stop #0x2000" : : : "cc");
 51 #endif
 52 }
 53 
 54 void machine_restart(char * __unused)
 55 {
 56         if (mach_reset)
 57                 mach_reset();
 58         for (;;);
 59 }
 60 
 61 void machine_halt(void)
 62 {
 63         if (mach_halt)
 64                 mach_halt();
 65         for (;;);
 66 }
 67 
 68 void machine_power_off(void)
 69 {
 70         if (mach_power_off)
 71                 mach_power_off();
 72         for (;;);
 73 }
 74 
 75 void (*pm_power_off)(void) = machine_power_off;
 76 EXPORT_SYMBOL(pm_power_off);
 77 
 78 void show_regs(struct pt_regs * regs)
 79 {
 80         pr_info("Format %02x  Vector: %04x  PC: %08lx  Status: %04x    %s\n",
 81                 regs->format, regs->vector, regs->pc, regs->sr,
 82                 print_tainted());
 83         pr_info("ORIG_D0: %08lx  D0: %08lx  A2: %08lx  A1: %08lx\n",
 84                 regs->orig_d0, regs->d0, regs->a2, regs->a1);
 85         pr_info("A0: %08lx  D5: %08lx  D4: %08lx\n", regs->a0, regs->d5,
 86                 regs->d4);
 87         pr_info("D3: %08lx  D2: %08lx  D1: %08lx\n", regs->d3, regs->d2,
 88                 regs->d1);
 89         if (!(regs->sr & PS_S))
 90                 pr_info("USP: %08lx\n", rdusp());
 91 }
 92 
 93 void flush_thread(void)
 94 {
 95         current->thread.fs = __USER_DS;
 96 #ifdef CONFIG_FPU
 97         if (!FPU_IS_EMU) {
 98                 unsigned long zero = 0;
 99                 asm volatile("frestore %0": :"m" (zero));
100         }
101 #endif
102 }
103 
104 /*
105  * Why not generic sys_clone, you ask?  m68k passes all arguments on stack.
106  * And we need all registers saved, which means a bunch of stuff pushed
107  * on top of pt_regs, which means that sys_clone() arguments would be
108  * buried.  We could, of course, copy them, but it's too costly for no
109  * good reason - generic clone() would have to copy them *again* for
110  * do_fork() anyway.  So in this case it's actually better to pass pt_regs *
111  * and extract arguments for do_fork() from there.  Eventually we might
112  * go for calling do_fork() directly from the wrapper, but only after we
113  * are finished with do_fork() prototype conversion.
114  */
115 asmlinkage int m68k_clone(struct pt_regs *regs)
116 {
117         /* regs will be equal to current_pt_regs() */
118         return do_fork(regs->d1, regs->d2, 0,
119                        (int __user *)regs->d3, (int __user *)regs->d4);
120 }
121 
122 int copy_thread(unsigned long clone_flags, unsigned long usp,
123                  unsigned long arg, struct task_struct *p)
124 {
125         struct fork_frame {
126                 struct switch_stack sw;
127                 struct pt_regs regs;
128         } *frame;
129 
130         frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1;
131 
132         p->thread.ksp = (unsigned long)frame;
133         p->thread.esp0 = (unsigned long)&frame->regs;
134 
135         /*
136          * Must save the current SFC/DFC value, NOT the value when
137          * the parent was last descheduled - RGH  10-08-96
138          */
139         p->thread.fs = get_fs().seg;
140 
141         if (unlikely(p->flags & PF_KTHREAD)) {
142                 /* kernel thread */
143                 memset(frame, 0, sizeof(struct fork_frame));
144                 frame->regs.sr = PS_S;
145                 frame->sw.a3 = usp; /* function */
146                 frame->sw.d7 = arg;
147                 frame->sw.retpc = (unsigned long)ret_from_kernel_thread;
148                 p->thread.usp = 0;
149                 return 0;
150         }
151         memcpy(frame, container_of(current_pt_regs(), struct fork_frame, regs),
152                 sizeof(struct fork_frame));
153         frame->regs.d0 = 0;
154         frame->sw.retpc = (unsigned long)ret_from_fork;
155         p->thread.usp = usp ?: rdusp();
156 
157         if (clone_flags & CLONE_SETTLS)
158                 task_thread_info(p)->tp_value = frame->regs.d5;
159 
160 #ifdef CONFIG_FPU
161         if (!FPU_IS_EMU) {
162                 /* Copy the current fpu state */
163                 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
164 
165                 if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
166                         if (CPU_IS_COLDFIRE) {
167                                 asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
168                                               "fmovel %/fpiar,%1\n\t"
169                                               "fmovel %/fpcr,%2\n\t"
170                                               "fmovel %/fpsr,%3"
171                                               :
172                                               : "m" (p->thread.fp[0]),
173                                                 "m" (p->thread.fpcntl[0]),
174                                                 "m" (p->thread.fpcntl[1]),
175                                                 "m" (p->thread.fpcntl[2])
176                                               : "memory");
177                         } else {
178                                 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
179                                               "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
180                                               :
181                                               : "m" (p->thread.fp[0]),
182                                                 "m" (p->thread.fpcntl[0])
183                                               : "memory");
184                         }
185                 }
186 
187                 /* Restore the state in case the fpu was busy */
188                 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
189         }
190 #endif /* CONFIG_FPU */
191 
192         return 0;
193 }
194 
195 /* Fill in the fpu structure for a core dump.  */
196 int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
197 {
198         if (FPU_IS_EMU) {
199                 int i;
200 
201                 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
202                 memcpy(fpu->fpregs, current->thread.fp, 96);
203                 /* Convert internal fpu reg representation
204                  * into long double format
205                  */
206                 for (i = 0; i < 24; i += 3)
207                         fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
208                                          ((fpu->fpregs[i] & 0x0000ffff) << 16);
209                 return 1;
210         }
211 
212         if (IS_ENABLED(CONFIG_FPU)) {
213                 char fpustate[216];
214 
215                 /* First dump the fpu context to avoid protocol violation.  */
216                 asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
217                 if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
218                         return 0;
219 
220                 if (CPU_IS_COLDFIRE) {
221                         asm volatile ("fmovel %/fpiar,%0\n\t"
222                                       "fmovel %/fpcr,%1\n\t"
223                                       "fmovel %/fpsr,%2\n\t"
224                                       "fmovemd %/fp0-%/fp7,%3"
225                                       :
226                                       : "m" (fpu->fpcntl[0]),
227                                         "m" (fpu->fpcntl[1]),
228                                         "m" (fpu->fpcntl[2]),
229                                         "m" (fpu->fpregs[0])
230                                       : "memory");
231                 } else {
232                         asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
233                                       :
234                                       : "m" (fpu->fpcntl[0])
235                                       : "memory");
236                         asm volatile ("fmovemx %/fp0-%/fp7,%0"
237                                       :
238                                       : "m" (fpu->fpregs[0])
239                                       : "memory");
240                 }
241         }
242 
243         return 1;
244 }
245 EXPORT_SYMBOL(dump_fpu);
246 
247 unsigned long get_wchan(struct task_struct *p)
248 {
249         unsigned long fp, pc;
250         unsigned long stack_page;
251         int count = 0;
252         if (!p || p == current || p->state == TASK_RUNNING)
253                 return 0;
254 
255         stack_page = (unsigned long)task_stack_page(p);
256         fp = ((struct switch_stack *)p->thread.ksp)->a6;
257         do {
258                 if (fp < stack_page+sizeof(struct thread_info) ||
259                     fp >= 8184+stack_page)
260                         return 0;
261                 pc = ((unsigned long *)fp)[1];
262                 if (!in_sched_functions(pc))
263                         return pc;
264                 fp = *(unsigned long *) fp;
265         } while (count++ < 16);
266         return 0;
267 }
268 

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