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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
41asmlinkage void ret_from_fork(void);
42asmlinkage void ret_from_kernel_thread(void);
43
44void arch_cpu_idle(void)
45{
46#if defined(MACH_ATARI_ONLY)
47
48 __asm__("stop #0x2200" : : : "cc");
49#else
50 __asm__("stop #0x2000" : : : "cc");
51#endif
52}
53
54void machine_restart(char * __unused)
55{
56 if (mach_reset)
57 mach_reset();
58 for (;;);
59}
60
61void machine_halt(void)
62{
63 if (mach_halt)
64 mach_halt();
65 for (;;);
66}
67
68void machine_power_off(void)
69{
70 if (mach_power_off)
71 mach_power_off();
72 for (;;);
73}
74
75void (*pm_power_off)(void) = machine_power_off;
76EXPORT_SYMBOL(pm_power_off);
77
78void 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
93void 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
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109
110
111
112
113
114
115asmlinkage int m68k_clone(struct pt_regs *regs)
116{
117
118 return do_fork(regs->d1, regs->d2, 0,
119 (int __user *)regs->d3, (int __user *)regs->d4);
120}
121
122int 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
137
138
139 p->thread.fs = get_fs().seg;
140
141 if (unlikely(p->flags & PF_KTHREAD)) {
142
143 memset(frame, 0, sizeof(struct fork_frame));
144 frame->regs.sr = PS_S;
145 frame->sw.a3 = usp;
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
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
188 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
189 }
190#endif
191
192 return 0;
193}
194
195
196int 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
204
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
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}
245EXPORT_SYMBOL(dump_fpu);
246
247unsigned 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