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-rw-r--r--arch/m68k/kernel/process.c405
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diff --git a/arch/m68k/kernel/process.c b/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/config.h>
14#include <linux/errno.h>
15#include <linux/module.h>
16#include <linux/sched.h>
17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/smp.h>
20#include <linux/smp_lock.h>
21#include <linux/stddef.h>
22#include <linux/unistd.h>
23#include <linux/ptrace.h>
24#include <linux/slab.h>
25#include <linux/user.h>
26#include <linux/a.out.h>
27#include <linux/reboot.h>
28#include <linux/init_task.h>
29#include <linux/mqueue.h>
30
31#include <asm/uaccess.h>
32#include <asm/system.h>
33#include <asm/traps.h>
34#include <asm/machdep.h>
35#include <asm/setup.h>
36#include <asm/pgtable.h>
37
38/*
39 * Initial task/thread structure. Make this a per-architecture thing,
40 * because different architectures tend to have different
41 * alignment requirements and potentially different initial
42 * setup.
43 */
44static struct fs_struct init_fs = INIT_FS;
45static struct files_struct init_files = INIT_FILES;
46static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
47static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
48struct mm_struct init_mm = INIT_MM(init_mm);
49
50EXPORT_SYMBOL(init_mm);
51
52union thread_union init_thread_union
53__attribute__((section(".data.init_task"), aligned(THREAD_SIZE)))
54 = { INIT_THREAD_INFO(init_task) };
55
56/* initial task structure */
57struct task_struct init_task = INIT_TASK(init_task);
58
59EXPORT_SYMBOL(init_task);
60
61asmlinkage void ret_from_fork(void);
62
63
64/*
65 * Return saved PC from a blocked thread
66 */
67unsigned long thread_saved_pc(struct task_struct *tsk)
68{
69 struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
70 /* Check whether the thread is blocked in resume() */
71 if (in_sched_functions(sw->retpc))
72 return ((unsigned long *)sw->a6)[1];
73 else
74 return sw->retpc;
75}
76
77/*
78 * The idle loop on an m68k..
79 */
80void default_idle(void)
81{
82 if (!need_resched())
83#if defined(MACH_ATARI_ONLY) && !defined(CONFIG_HADES)
84 /* block out HSYNC on the atari (falcon) */
85 __asm__("stop #0x2200" : : : "cc");
86#else
87 __asm__("stop #0x2000" : : : "cc");
88#endif
89}
90
91void (*idle)(void) = default_idle;
92
93/*
94 * The idle thread. There's no useful work to be
95 * done, so just try to conserve power and have a
96 * low exit latency (ie sit in a loop waiting for
97 * somebody to say that they'd like to reschedule)
98 */
99void cpu_idle(void)
100{
101 /* endless idle loop with no priority at all */
102 while (1) {
103 while (!need_resched())
104 idle();
105 schedule();
106 }
107}
108
109void machine_restart(char * __unused)
110{
111 if (mach_reset)
112 mach_reset();
113 for (;;);
114}
115
116EXPORT_SYMBOL(machine_restart);
117
118void machine_halt(void)
119{
120 if (mach_halt)
121 mach_halt();
122 for (;;);
123}
124
125EXPORT_SYMBOL(machine_halt);
126
127void machine_power_off(void)
128{
129 if (mach_power_off)
130 mach_power_off();
131 for (;;);
132}
133
134EXPORT_SYMBOL(machine_power_off);
135
136void show_regs(struct pt_regs * regs)
137{
138 printk("\n");
139 printk("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
140 regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
141 printk("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
142 regs->orig_d0, regs->d0, regs->a2, regs->a1);
143 printk("A0: %08lx D5: %08lx D4: %08lx\n",
144 regs->a0, regs->d5, regs->d4);
145 printk("D3: %08lx D2: %08lx D1: %08lx\n",
146 regs->d3, regs->d2, regs->d1);
147 if (!(regs->sr & PS_S))
148 printk("USP: %08lx\n", rdusp());
149}
150
151/*
152 * Create a kernel thread
153 */
154int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
155{
156 int pid;
157 mm_segment_t fs;
158
159 fs = get_fs();
160 set_fs (KERNEL_DS);
161
162 {
163 register long retval __asm__ ("d0");
164 register long clone_arg __asm__ ("d1") = flags | CLONE_VM | CLONE_UNTRACED;
165
166 retval = __NR_clone;
167 __asm__ __volatile__
168 ("clrl %%d2\n\t"
169 "trap #0\n\t" /* Linux/m68k system call */
170 "tstl %0\n\t" /* child or parent */
171 "jne 1f\n\t" /* parent - jump */
172 "lea %%sp@(%c7),%6\n\t" /* reload current */
173 "movel %6@,%6\n\t"
174 "movel %3,%%sp@-\n\t" /* push argument */
175 "jsr %4@\n\t" /* call fn */
176 "movel %0,%%d1\n\t" /* pass exit value */
177 "movel %2,%%d0\n\t" /* exit */
178 "trap #0\n"
179 "1:"
180 : "+d" (retval)
181 : "i" (__NR_clone), "i" (__NR_exit),
182 "r" (arg), "a" (fn), "d" (clone_arg), "r" (current),
183 "i" (-THREAD_SIZE)
184 : "d2");
185
186 pid = retval;
187 }
188
189 set_fs (fs);
190 return pid;
191}
192
193void flush_thread(void)
194{
195 unsigned long zero = 0;
196 set_fs(USER_DS);
197 current->thread.fs = __USER_DS;
198 if (!FPU_IS_EMU)
199 asm volatile (".chip 68k/68881\n\t"
200 "frestore %0@\n\t"
201 ".chip 68k" : : "a" (&zero));
202}
203
204/*
205 * "m68k_fork()".. By the time we get here, the
206 * non-volatile registers have also been saved on the
207 * stack. We do some ugly pointer stuff here.. (see
208 * also copy_thread)
209 */
210
211asmlinkage int m68k_fork(struct pt_regs *regs)
212{
213 return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
214}
215
216asmlinkage int m68k_vfork(struct pt_regs *regs)
217{
218 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0,
219 NULL, NULL);
220}
221
222asmlinkage int m68k_clone(struct pt_regs *regs)
223{
224 unsigned long clone_flags;
225 unsigned long newsp;
226 int *parent_tidptr, *child_tidptr;
227
228 /* syscall2 puts clone_flags in d1 and usp in d2 */
229 clone_flags = regs->d1;
230 newsp = regs->d2;
231 parent_tidptr = (int *)regs->d3;
232 child_tidptr = (int *)regs->d4;
233 if (!newsp)
234 newsp = rdusp();
235 return do_fork(clone_flags, newsp, regs, 0,
236 parent_tidptr, child_tidptr);
237}
238
239int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
240 unsigned long unused,
241 struct task_struct * p, struct pt_regs * regs)
242{
243 struct pt_regs * childregs;
244 struct switch_stack * childstack, *stack;
245 unsigned long stack_offset, *retp;
246
247 stack_offset = THREAD_SIZE - sizeof(struct pt_regs);
248 childregs = (struct pt_regs *) ((unsigned long) (p->thread_info) + stack_offset);
249
250 *childregs = *regs;
251 childregs->d0 = 0;
252
253 retp = ((unsigned long *) regs);
254 stack = ((struct switch_stack *) retp) - 1;
255
256 childstack = ((struct switch_stack *) childregs) - 1;
257 *childstack = *stack;
258 childstack->retpc = (unsigned long)ret_from_fork;
259
260 p->thread.usp = usp;
261 p->thread.ksp = (unsigned long)childstack;
262 /*
263 * Must save the current SFC/DFC value, NOT the value when
264 * the parent was last descheduled - RGH 10-08-96
265 */
266 p->thread.fs = get_fs().seg;
267
268 if (!FPU_IS_EMU) {
269 /* Copy the current fpu state */
270 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
271
272 if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2])
273 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
274 "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
275 : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
276 : "memory");
277 /* Restore the state in case the fpu was busy */
278 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
279 }
280
281 return 0;
282}
283
284/* Fill in the fpu structure for a core dump. */
285
286int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
287{
288 char fpustate[216];
289
290 if (FPU_IS_EMU) {
291 int i;
292
293 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
294 memcpy(fpu->fpregs, current->thread.fp, 96);
295 /* Convert internal fpu reg representation
296 * into long double format
297 */
298 for (i = 0; i < 24; i += 3)
299 fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
300 ((fpu->fpregs[i] & 0x0000ffff) << 16);
301 return 1;
302 }
303
304 /* First dump the fpu context to avoid protocol violation. */
305 asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
306 if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
307 return 0;
308
309 asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
310 :: "m" (fpu->fpcntl[0])
311 : "memory");
312 asm volatile ("fmovemx %/fp0-%/fp7,%0"
313 :: "m" (fpu->fpregs[0])
314 : "memory");
315 return 1;
316}
317
318/*
319 * fill in the user structure for a core dump..
320 */
321void dump_thread(struct pt_regs * regs, struct user * dump)
322{
323 struct switch_stack *sw;
324
325/* changed the size calculations - should hopefully work better. lbt */
326 dump->magic = CMAGIC;
327 dump->start_code = 0;
328 dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
329 dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
330 dump->u_dsize = ((unsigned long) (current->mm->brk +
331 (PAGE_SIZE-1))) >> PAGE_SHIFT;
332 dump->u_dsize -= dump->u_tsize;
333 dump->u_ssize = 0;
334
335 if (dump->start_stack < TASK_SIZE)
336 dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
337
338 dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
339 sw = ((struct switch_stack *)regs) - 1;
340 dump->regs.d1 = regs->d1;
341 dump->regs.d2 = regs->d2;
342 dump->regs.d3 = regs->d3;
343 dump->regs.d4 = regs->d4;
344 dump->regs.d5 = regs->d5;
345 dump->regs.d6 = sw->d6;
346 dump->regs.d7 = sw->d7;
347 dump->regs.a0 = regs->a0;
348 dump->regs.a1 = regs->a1;
349 dump->regs.a2 = regs->a2;
350 dump->regs.a3 = sw->a3;
351 dump->regs.a4 = sw->a4;
352 dump->regs.a5 = sw->a5;
353 dump->regs.a6 = sw->a6;
354 dump->regs.d0 = regs->d0;
355 dump->regs.orig_d0 = regs->orig_d0;
356 dump->regs.stkadj = regs->stkadj;
357 dump->regs.sr = regs->sr;
358 dump->regs.pc = regs->pc;
359 dump->regs.fmtvec = (regs->format << 12) | regs->vector;
360 /* dump floating point stuff */
361 dump->u_fpvalid = dump_fpu (regs, &dump->m68kfp);
362}
363
364/*
365 * sys_execve() executes a new program.
366 */
367asmlinkage int sys_execve(char *name, char **argv, char **envp)
368{
369 int error;
370 char * filename;
371 struct pt_regs *regs = (struct pt_regs *) &name;
372
373 lock_kernel();
374 filename = getname(name);
375 error = PTR_ERR(filename);
376 if (IS_ERR(filename))
377 goto out;
378 error = do_execve(filename, argv, envp, regs);
379 putname(filename);
380out:
381 unlock_kernel();
382 return error;
383}
384
385unsigned long get_wchan(struct task_struct *p)
386{
387 unsigned long fp, pc;
388 unsigned long stack_page;
389 int count = 0;
390 if (!p || p == current || p->state == TASK_RUNNING)
391 return 0;
392
393 stack_page = (unsigned long)(p->thread_info);
394 fp = ((struct switch_stack *)p->thread.ksp)->a6;
395 do {
396 if (fp < stack_page+sizeof(struct thread_info) ||
397 fp >= 8184+stack_page)
398 return 0;
399 pc = ((unsigned long *)fp)[1];
400 if (!in_sched_functions(pc))
401 return pc;
402 fp = *(unsigned long *) fp;
403 } while (count++ < 16);
404 return 0;
405}
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