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fde39441 GU |
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> | |
b17b0153 | 16 | #include <linux/sched/debug.h> |
fde39441 GU |
17 | #include <linux/kernel.h> |
18 | #include <linux/mm.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/smp.h> | |
22 | #include <linux/stddef.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/user.h> | |
26 | #include <linux/reboot.h> | |
27 | #include <linux/init_task.h> | |
28 | #include <linux/mqueue.h> | |
5b57ba37 | 29 | #include <linux/rcupdate.h> |
fde39441 | 30 | |
7c0f6ba6 | 31 | #include <linux/uaccess.h> |
fde39441 GU |
32 | #include <asm/traps.h> |
33 | #include <asm/machdep.h> | |
34 | #include <asm/setup.h> | |
35 | #include <asm/pgtable.h> | |
36 | ||
37 | ||
38 | asmlinkage void ret_from_fork(void); | |
533e6903 | 39 | asmlinkage void ret_from_kernel_thread(void); |
fde39441 GU |
40 | |
41 | ||
42 | /* | |
43 | * Return saved PC from a blocked thread | |
44 | */ | |
45 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
46 | { | |
47 | struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp; | |
48 | /* Check whether the thread is blocked in resume() */ | |
49 | if (in_sched_functions(sw->retpc)) | |
50 | return ((unsigned long *)sw->a6)[1]; | |
51 | else | |
52 | return sw->retpc; | |
53 | } | |
54 | ||
dfa174dc | 55 | void arch_cpu_idle(void) |
fde39441 | 56 | { |
fde39441 | 57 | #if defined(MACH_ATARI_ONLY) |
dfa174dc TG |
58 | /* block out HSYNC on the atari (falcon) */ |
59 | __asm__("stop #0x2200" : : : "cc"); | |
fde39441 | 60 | #else |
dfa174dc | 61 | __asm__("stop #0x2000" : : : "cc"); |
fde39441 GU |
62 | #endif |
63 | } | |
64 | ||
fde39441 GU |
65 | void machine_restart(char * __unused) |
66 | { | |
67 | if (mach_reset) | |
68 | mach_reset(); | |
69 | for (;;); | |
70 | } | |
71 | ||
72 | void machine_halt(void) | |
73 | { | |
74 | if (mach_halt) | |
75 | mach_halt(); | |
76 | for (;;); | |
77 | } | |
78 | ||
79 | void machine_power_off(void) | |
80 | { | |
81 | if (mach_power_off) | |
82 | mach_power_off(); | |
83 | for (;;); | |
84 | } | |
85 | ||
86 | void (*pm_power_off)(void) = machine_power_off; | |
87 | EXPORT_SYMBOL(pm_power_off); | |
88 | ||
89 | void show_regs(struct pt_regs * regs) | |
90 | { | |
7c79e1ee GU |
91 | pr_info("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n", |
92 | regs->format, regs->vector, regs->pc, regs->sr, | |
93 | print_tainted()); | |
94 | pr_info("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n", | |
95 | regs->orig_d0, regs->d0, regs->a2, regs->a1); | |
96 | pr_info("A0: %08lx D5: %08lx D4: %08lx\n", regs->a0, regs->d5, | |
97 | regs->d4); | |
98 | pr_info("D3: %08lx D2: %08lx D1: %08lx\n", regs->d3, regs->d2, | |
99 | regs->d1); | |
fde39441 | 100 | if (!(regs->sr & PS_S)) |
7c79e1ee | 101 | pr_info("USP: %08lx\n", rdusp()); |
fde39441 GU |
102 | } |
103 | ||
fde39441 GU |
104 | void flush_thread(void) |
105 | { | |
106 | current->thread.fs = __USER_DS; | |
107 | #ifdef CONFIG_FPU | |
108 | if (!FPU_IS_EMU) { | |
109 | unsigned long zero = 0; | |
110 | asm volatile("frestore %0": :"m" (zero)); | |
111 | } | |
112 | #endif | |
113 | } | |
114 | ||
115 | /* | |
20ecc91c AV |
116 | * Why not generic sys_clone, you ask? m68k passes all arguments on stack. |
117 | * And we need all registers saved, which means a bunch of stuff pushed | |
118 | * on top of pt_regs, which means that sys_clone() arguments would be | |
119 | * buried. We could, of course, copy them, but it's too costly for no | |
120 | * good reason - generic clone() would have to copy them *again* for | |
121 | * do_fork() anyway. So in this case it's actually better to pass pt_regs * | |
122 | * and extract arguments for do_fork() from there. Eventually we might | |
123 | * go for calling do_fork() directly from the wrapper, but only after we | |
124 | * are finished with do_fork() prototype conversion. | |
fde39441 | 125 | */ |
fde39441 GU |
126 | asmlinkage int m68k_clone(struct pt_regs *regs) |
127 | { | |
20ecc91c | 128 | /* regs will be equal to current_pt_regs() */ |
e80d6661 | 129 | return do_fork(regs->d1, regs->d2, 0, |
20ecc91c | 130 | (int __user *)regs->d3, (int __user *)regs->d4); |
fde39441 GU |
131 | } |
132 | ||
133 | int copy_thread(unsigned long clone_flags, unsigned long usp, | |
afa86fc4 | 134 | unsigned long arg, struct task_struct *p) |
fde39441 | 135 | { |
20ecc91c AV |
136 | struct fork_frame { |
137 | struct switch_stack sw; | |
138 | struct pt_regs regs; | |
139 | } *frame; | |
fde39441 | 140 | |
20ecc91c | 141 | frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1; |
fde39441 | 142 | |
20ecc91c AV |
143 | p->thread.ksp = (unsigned long)frame; |
144 | p->thread.esp0 = (unsigned long)&frame->regs; | |
fde39441 GU |
145 | |
146 | /* | |
147 | * Must save the current SFC/DFC value, NOT the value when | |
148 | * the parent was last descheduled - RGH 10-08-96 | |
149 | */ | |
150 | p->thread.fs = get_fs().seg; | |
151 | ||
20ecc91c | 152 | if (unlikely(p->flags & PF_KTHREAD)) { |
533e6903 | 153 | /* kernel thread */ |
20ecc91c AV |
154 | memset(frame, 0, sizeof(struct fork_frame)); |
155 | frame->regs.sr = PS_S; | |
156 | frame->sw.a3 = usp; /* function */ | |
157 | frame->sw.d7 = arg; | |
158 | frame->sw.retpc = (unsigned long)ret_from_kernel_thread; | |
533e6903 AV |
159 | p->thread.usp = 0; |
160 | return 0; | |
161 | } | |
20ecc91c AV |
162 | memcpy(frame, container_of(current_pt_regs(), struct fork_frame, regs), |
163 | sizeof(struct fork_frame)); | |
164 | frame->regs.d0 = 0; | |
165 | frame->sw.retpc = (unsigned long)ret_from_fork; | |
166 | p->thread.usp = usp ?: rdusp(); | |
533e6903 AV |
167 | |
168 | if (clone_flags & CLONE_SETTLS) | |
20ecc91c | 169 | task_thread_info(p)->tp_value = frame->regs.d5; |
533e6903 | 170 | |
fde39441 GU |
171 | #ifdef CONFIG_FPU |
172 | if (!FPU_IS_EMU) { | |
173 | /* Copy the current fpu state */ | |
174 | asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory"); | |
175 | ||
176 | if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) { | |
177 | if (CPU_IS_COLDFIRE) { | |
178 | asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t" | |
179 | "fmovel %/fpiar,%1\n\t" | |
180 | "fmovel %/fpcr,%2\n\t" | |
181 | "fmovel %/fpsr,%3" | |
182 | : | |
183 | : "m" (p->thread.fp[0]), | |
184 | "m" (p->thread.fpcntl[0]), | |
185 | "m" (p->thread.fpcntl[1]), | |
186 | "m" (p->thread.fpcntl[2]) | |
187 | : "memory"); | |
188 | } else { | |
189 | asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t" | |
190 | "fmoveml %/fpiar/%/fpcr/%/fpsr,%1" | |
191 | : | |
192 | : "m" (p->thread.fp[0]), | |
193 | "m" (p->thread.fpcntl[0]) | |
194 | : "memory"); | |
195 | } | |
196 | } | |
197 | ||
198 | /* Restore the state in case the fpu was busy */ | |
199 | asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0])); | |
200 | } | |
201 | #endif /* CONFIG_FPU */ | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | /* Fill in the fpu structure for a core dump. */ | |
fde39441 GU |
207 | int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu) |
208 | { | |
fde39441 GU |
209 | if (FPU_IS_EMU) { |
210 | int i; | |
211 | ||
212 | memcpy(fpu->fpcntl, current->thread.fpcntl, 12); | |
213 | memcpy(fpu->fpregs, current->thread.fp, 96); | |
214 | /* Convert internal fpu reg representation | |
215 | * into long double format | |
216 | */ | |
217 | for (i = 0; i < 24; i += 3) | |
218 | fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) | | |
219 | ((fpu->fpregs[i] & 0x0000ffff) << 16); | |
220 | return 1; | |
221 | } | |
222 | ||
8912eacc GU |
223 | if (IS_ENABLED(CONFIG_FPU)) { |
224 | char fpustate[216]; | |
fde39441 | 225 | |
8912eacc GU |
226 | /* First dump the fpu context to avoid protocol violation. */ |
227 | asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory"); | |
228 | if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2]) | |
229 | return 0; | |
230 | ||
231 | if (CPU_IS_COLDFIRE) { | |
232 | asm volatile ("fmovel %/fpiar,%0\n\t" | |
233 | "fmovel %/fpcr,%1\n\t" | |
234 | "fmovel %/fpsr,%2\n\t" | |
235 | "fmovemd %/fp0-%/fp7,%3" | |
236 | : | |
237 | : "m" (fpu->fpcntl[0]), | |
238 | "m" (fpu->fpcntl[1]), | |
239 | "m" (fpu->fpcntl[2]), | |
240 | "m" (fpu->fpregs[0]) | |
241 | : "memory"); | |
242 | } else { | |
243 | asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0" | |
244 | : | |
245 | : "m" (fpu->fpcntl[0]) | |
246 | : "memory"); | |
247 | asm volatile ("fmovemx %/fp0-%/fp7,%0" | |
248 | : | |
249 | : "m" (fpu->fpregs[0]) | |
250 | : "memory"); | |
251 | } | |
fde39441 GU |
252 | } |
253 | ||
254 | return 1; | |
255 | } | |
256 | EXPORT_SYMBOL(dump_fpu); | |
fde39441 | 257 | |
fde39441 GU |
258 | unsigned long get_wchan(struct task_struct *p) |
259 | { | |
260 | unsigned long fp, pc; | |
261 | unsigned long stack_page; | |
262 | int count = 0; | |
263 | if (!p || p == current || p->state == TASK_RUNNING) | |
264 | return 0; | |
265 | ||
266 | stack_page = (unsigned long)task_stack_page(p); | |
267 | fp = ((struct switch_stack *)p->thread.ksp)->a6; | |
268 | do { | |
269 | if (fp < stack_page+sizeof(struct thread_info) || | |
270 | fp >= 8184+stack_page) | |
271 | return 0; | |
272 | pc = ((unsigned long *)fp)[1]; | |
273 | if (!in_sched_functions(pc)) | |
274 | return pc; | |
275 | fp = *(unsigned long *) fp; | |
276 | } while (count++ < 16); | |
277 | return 0; | |
278 | } |