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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> | |
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> | |
5b57ba37 | 28 | #include <linux/rcupdate.h> |
fde39441 GU |
29 | |
30 | #include <asm/uaccess.h> | |
fde39441 GU |
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); | |
533e6903 | 38 | asmlinkage void ret_from_kernel_thread(void); |
fde39441 GU |
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 | ||
dfa174dc | 54 | void arch_cpu_idle(void) |
fde39441 | 55 | { |
fde39441 | 56 | #if defined(MACH_ATARI_ONLY) |
dfa174dc TG |
57 | /* block out HSYNC on the atari (falcon) */ |
58 | __asm__("stop #0x2200" : : : "cc"); | |
fde39441 | 59 | #else |
dfa174dc | 60 | __asm__("stop #0x2000" : : : "cc"); |
fde39441 GU |
61 | #endif |
62 | } | |
63 | ||
fde39441 GU |
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 | ||
fde39441 GU |
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 | /* | |
20ecc91c AV |
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. | |
fde39441 | 124 | */ |
fde39441 GU |
125 | asmlinkage int m68k_clone(struct pt_regs *regs) |
126 | { | |
20ecc91c | 127 | /* regs will be equal to current_pt_regs() */ |
e80d6661 | 128 | return do_fork(regs->d1, regs->d2, 0, |
20ecc91c | 129 | (int __user *)regs->d3, (int __user *)regs->d4); |
fde39441 GU |
130 | } |
131 | ||
132 | int copy_thread(unsigned long clone_flags, unsigned long usp, | |
afa86fc4 | 133 | unsigned long arg, struct task_struct *p) |
fde39441 | 134 | { |
20ecc91c AV |
135 | struct fork_frame { |
136 | struct switch_stack sw; | |
137 | struct pt_regs regs; | |
138 | } *frame; | |
fde39441 | 139 | |
20ecc91c | 140 | frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1; |
fde39441 | 141 | |
20ecc91c AV |
142 | p->thread.ksp = (unsigned long)frame; |
143 | p->thread.esp0 = (unsigned long)&frame->regs; | |
fde39441 GU |
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 | ||
20ecc91c | 151 | if (unlikely(p->flags & PF_KTHREAD)) { |
533e6903 | 152 | /* kernel thread */ |
20ecc91c AV |
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; | |
533e6903 AV |
158 | p->thread.usp = 0; |
159 | return 0; | |
160 | } | |
20ecc91c AV |
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(); | |
533e6903 AV |
166 | |
167 | if (clone_flags & CLONE_SETTLS) | |
20ecc91c | 168 | task_thread_info(p)->tp_value = frame->regs.d5; |
533e6903 | 169 | |
fde39441 GU |
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 | ||
fde39441 GU |
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 | } |