aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m68k/kernel/process_mm.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/m68k/kernel/process_mm.c')
-rw-r--r--arch/m68k/kernel/process_mm.c367
1 files changed, 0 insertions, 367 deletions
diff --git a/arch/m68k/kernel/process_mm.c b/arch/m68k/kernel/process_mm.c
deleted file mode 100644
index fe4186b5fc32..000000000000
--- a/arch/m68k/kernel/process_mm.c
+++ /dev/null
@@ -1,367 +0,0 @@
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>
28
29#include <asm/uaccess.h>
30#include <asm/system.h>
31#include <asm/traps.h>
32#include <asm/machdep.h>
33#include <asm/setup.h>
34#include <asm/pgtable.h>
35
36
37asmlinkage void ret_from_fork(void);
38
39
40/*
41 * Return saved PC from a blocked thread
42 */
43unsigned long thread_saved_pc(struct task_struct *tsk)
44{
45 struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
46 /* Check whether the thread is blocked in resume() */
47 if (in_sched_functions(sw->retpc))
48 return ((unsigned long *)sw->a6)[1];
49 else
50 return sw->retpc;
51}
52
53/*
54 * The idle loop on an m68k..
55 */
56static void default_idle(void)
57{
58 if (!need_resched())
59#if defined(MACH_ATARI_ONLY)
60 /* block out HSYNC on the atari (falcon) */
61 __asm__("stop #0x2200" : : : "cc");
62#else
63 __asm__("stop #0x2000" : : : "cc");
64#endif
65}
66
67void (*idle)(void) = default_idle;
68
69/*
70 * The idle thread. There's no useful work to be
71 * done, so just try to conserve power and have a
72 * low exit latency (ie sit in a loop waiting for
73 * somebody to say that they'd like to reschedule)
74 */
75void cpu_idle(void)
76{
77 /* endless idle loop with no priority at all */
78 while (1) {
79 while (!need_resched())
80 idle();
81 schedule_preempt_disabled();
82 }
83}
84
85void machine_restart(char * __unused)
86{
87 if (mach_reset)
88 mach_reset();
89 for (;;);
90}
91
92void machine_halt(void)
93{
94 if (mach_halt)
95 mach_halt();
96 for (;;);
97}
98
99void machine_power_off(void)
100{
101 if (mach_power_off)
102 mach_power_off();
103 for (;;);
104}
105
106void (*pm_power_off)(void) = machine_power_off;
107EXPORT_SYMBOL(pm_power_off);
108
109void show_regs(struct pt_regs * regs)
110{
111 printk("\n");
112 printk("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
113 regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
114 printk("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
115 regs->orig_d0, regs->d0, regs->a2, regs->a1);
116 printk("A0: %08lx D5: %08lx D4: %08lx\n",
117 regs->a0, regs->d5, regs->d4);
118 printk("D3: %08lx D2: %08lx D1: %08lx\n",
119 regs->d3, regs->d2, regs->d1);
120 if (!(regs->sr & PS_S))
121 printk("USP: %08lx\n", rdusp());
122}
123
124/*
125 * Create a kernel thread
126 */
127int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
128{
129 int pid;
130 mm_segment_t fs;
131
132 fs = get_fs();
133 set_fs (KERNEL_DS);
134
135 {
136 register long retval __asm__ ("d0");
137 register long clone_arg __asm__ ("d1") = flags | CLONE_VM | CLONE_UNTRACED;
138
139 retval = __NR_clone;
140 __asm__ __volatile__
141 ("clrl %%d2\n\t"
142 "trap #0\n\t" /* Linux/m68k system call */
143 "tstl %0\n\t" /* child or parent */
144 "jne 1f\n\t" /* parent - jump */
145 "lea %%sp@(%c7),%6\n\t" /* reload current */
146 "movel %6@,%6\n\t"
147 "movel %3,%%sp@-\n\t" /* push argument */
148 "jsr %4@\n\t" /* call fn */
149 "movel %0,%%d1\n\t" /* pass exit value */
150 "movel %2,%%d0\n\t" /* exit */
151 "trap #0\n"
152 "1:"
153 : "+d" (retval)
154 : "i" (__NR_clone), "i" (__NR_exit),
155 "r" (arg), "a" (fn), "d" (clone_arg), "r" (current),
156 "i" (-THREAD_SIZE)
157 : "d2");
158
159 pid = retval;
160 }
161
162 set_fs (fs);
163 return pid;
164}
165EXPORT_SYMBOL(kernel_thread);
166
167void flush_thread(void)
168{
169 unsigned long zero = 0;
170
171 current->thread.fs = __USER_DS;
172 if (!FPU_IS_EMU)
173 asm volatile("frestore %0": :"m" (zero));
174}
175
176/*
177 * "m68k_fork()".. By the time we get here, the
178 * non-volatile registers have also been saved on the
179 * stack. We do some ugly pointer stuff here.. (see
180 * also copy_thread)
181 */
182
183asmlinkage int m68k_fork(struct pt_regs *regs)
184{
185 return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
186}
187
188asmlinkage int m68k_vfork(struct pt_regs *regs)
189{
190 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0,
191 NULL, NULL);
192}
193
194asmlinkage int m68k_clone(struct pt_regs *regs)
195{
196 unsigned long clone_flags;
197 unsigned long newsp;
198 int __user *parent_tidptr, *child_tidptr;
199
200 /* syscall2 puts clone_flags in d1 and usp in d2 */
201 clone_flags = regs->d1;
202 newsp = regs->d2;
203 parent_tidptr = (int __user *)regs->d3;
204 child_tidptr = (int __user *)regs->d4;
205 if (!newsp)
206 newsp = rdusp();
207 return do_fork(clone_flags, newsp, regs, 0,
208 parent_tidptr, child_tidptr);
209}
210
211int copy_thread(unsigned long clone_flags, unsigned long usp,
212 unsigned long unused,
213 struct task_struct * p, struct pt_regs * regs)
214{
215 struct pt_regs * childregs;
216 struct switch_stack * childstack, *stack;
217 unsigned long *retp;
218
219 childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
220
221 *childregs = *regs;
222 childregs->d0 = 0;
223
224 retp = ((unsigned long *) regs);
225 stack = ((struct switch_stack *) retp) - 1;
226
227 childstack = ((struct switch_stack *) childregs) - 1;
228 *childstack = *stack;
229 childstack->retpc = (unsigned long)ret_from_fork;
230
231 p->thread.usp = usp;
232 p->thread.ksp = (unsigned long)childstack;
233
234 if (clone_flags & CLONE_SETTLS)
235 task_thread_info(p)->tp_value = regs->d5;
236
237 /*
238 * Must save the current SFC/DFC value, NOT the value when
239 * the parent was last descheduled - RGH 10-08-96
240 */
241 p->thread.fs = get_fs().seg;
242
243 if (!FPU_IS_EMU) {
244 /* Copy the current fpu state */
245 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
246
247 if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
248 if (CPU_IS_COLDFIRE) {
249 asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
250 "fmovel %/fpiar,%1\n\t"
251 "fmovel %/fpcr,%2\n\t"
252 "fmovel %/fpsr,%3"
253 :
254 : "m" (p->thread.fp[0]),
255 "m" (p->thread.fpcntl[0]),
256 "m" (p->thread.fpcntl[1]),
257 "m" (p->thread.fpcntl[2])
258 : "memory");
259 } else {
260 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
261 "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
262 :
263 : "m" (p->thread.fp[0]),
264 "m" (p->thread.fpcntl[0])
265 : "memory");
266 }
267 }
268
269 /* Restore the state in case the fpu was busy */
270 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
271 }
272
273 return 0;
274}
275
276/* Fill in the fpu structure for a core dump. */
277
278int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
279{
280 char fpustate[216];
281
282 if (FPU_IS_EMU) {
283 int i;
284
285 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
286 memcpy(fpu->fpregs, current->thread.fp, 96);
287 /* Convert internal fpu reg representation
288 * into long double format
289 */
290 for (i = 0; i < 24; i += 3)
291 fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
292 ((fpu->fpregs[i] & 0x0000ffff) << 16);
293 return 1;
294 }
295
296 /* First dump the fpu context to avoid protocol violation. */
297 asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
298 if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
299 return 0;
300
301 if (CPU_IS_COLDFIRE) {
302 asm volatile ("fmovel %/fpiar,%0\n\t"
303 "fmovel %/fpcr,%1\n\t"
304 "fmovel %/fpsr,%2\n\t"
305 "fmovemd %/fp0-%/fp7,%3"
306 :
307 : "m" (fpu->fpcntl[0]),
308 "m" (fpu->fpcntl[1]),
309 "m" (fpu->fpcntl[2]),
310 "m" (fpu->fpregs[0])
311 : "memory");
312 } else {
313 asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
314 :
315 : "m" (fpu->fpcntl[0])
316 : "memory");
317 asm volatile ("fmovemx %/fp0-%/fp7,%0"
318 :
319 : "m" (fpu->fpregs[0])
320 : "memory");
321 }
322
323 return 1;
324}
325EXPORT_SYMBOL(dump_fpu);
326
327/*
328 * sys_execve() executes a new program.
329 */
330asmlinkage int sys_execve(const char __user *name,
331 const char __user *const __user *argv,
332 const char __user *const __user *envp)
333{
334 int error;
335 char * filename;
336 struct pt_regs *regs = (struct pt_regs *) &name;
337
338 filename = getname(name);
339 error = PTR_ERR(filename);
340 if (IS_ERR(filename))
341 return error;
342 error = do_execve(filename, argv, envp, regs);
343 putname(filename);
344 return error;
345}
346
347unsigned long get_wchan(struct task_struct *p)
348{
349 unsigned long fp, pc;
350 unsigned long stack_page;
351 int count = 0;
352 if (!p || p == current || p->state == TASK_RUNNING)
353 return 0;
354
355 stack_page = (unsigned long)task_stack_page(p);
356 fp = ((struct switch_stack *)p->thread.ksp)->a6;
357 do {
358 if (fp < stack_page+sizeof(struct thread_info) ||
359 fp >= 8184+stack_page)
360 return 0;
361 pc = ((unsigned long *)fp)[1];
362 if (!in_sched_functions(pc))
363 return pc;
364 fp = *(unsigned long *) fp;
365 } while (count++ < 16);
366 return 0;
367}
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-08 06:10:48 -0500