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1da177e4 | 1 | /* |
5a4f7c66 | 2 | * arch/sh/kernel/process_64.c |
1da177e4 | 3 | * |
5a4f7c66 | 4 | * This file handles the architecture-dependent parts of process handling.. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
5a4f7c66 | 7 | * Copyright (C) 2003 - 2007 Paul Mundt |
1da177e4 LT |
8 | * Copyright (C) 2003, 2004 Richard Curnow |
9 | * | |
10 | * Started from SH3/4 version: | |
11 | * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
12 | * | |
13 | * In turn started from i386 version: | |
14 | * Copyright (C) 1995 Linus Torvalds | |
15 | * | |
5a4f7c66 PM |
16 | * This file is subject to the terms and conditions of the GNU General Public |
17 | * License. See the file "COPYING" in the main directory of this archive | |
18 | * for more details. | |
1da177e4 | 19 | */ |
1da177e4 | 20 | #include <linux/mm.h> |
78d98277 | 21 | #include <linux/fs.h> |
1da177e4 | 22 | #include <linux/ptrace.h> |
1da177e4 | 23 | #include <linux/reboot.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 | 25 | #include <linux/init.h> |
821278a7 | 26 | #include <linux/module.h> |
a7aa92d1 | 27 | #include <linux/io.h> |
fa43972f | 28 | #include <asm/syscalls.h> |
1da177e4 LT |
29 | #include <asm/uaccess.h> |
30 | #include <asm/pgtable.h> | |
df0fb256 | 31 | #include <asm/mmu_context.h> |
50387b3e | 32 | #include <asm/fpu.h> |
1da177e4 LT |
33 | |
34 | struct task_struct *last_task_used_math = NULL; | |
35 | ||
fbb82b03 | 36 | void show_regs(struct pt_regs *regs) |
1da177e4 LT |
37 | { |
38 | unsigned long long ah, al, bh, bl, ch, cl; | |
39 | ||
40 | printk("\n"); | |
41 | ||
42 | ah = (regs->pc) >> 32; | |
43 | al = (regs->pc) & 0xffffffff; | |
44 | bh = (regs->regs[18]) >> 32; | |
45 | bl = (regs->regs[18]) & 0xffffffff; | |
46 | ch = (regs->regs[15]) >> 32; | |
47 | cl = (regs->regs[15]) & 0xffffffff; | |
48 | printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n", | |
49 | ah, al, bh, bl, ch, cl); | |
50 | ||
51 | ah = (regs->sr) >> 32; | |
52 | al = (regs->sr) & 0xffffffff; | |
53 | asm volatile ("getcon " __TEA ", %0" : "=r" (bh)); | |
54 | asm volatile ("getcon " __TEA ", %0" : "=r" (bl)); | |
55 | bh = (bh) >> 32; | |
56 | bl = (bl) & 0xffffffff; | |
57 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); | |
58 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); | |
59 | ch = (ch) >> 32; | |
60 | cl = (cl) & 0xffffffff; | |
61 | printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", | |
62 | ah, al, bh, bl, ch, cl); | |
63 | ||
64 | ah = (regs->regs[0]) >> 32; | |
65 | al = (regs->regs[0]) & 0xffffffff; | |
66 | bh = (regs->regs[1]) >> 32; | |
67 | bl = (regs->regs[1]) & 0xffffffff; | |
68 | ch = (regs->regs[2]) >> 32; | |
69 | cl = (regs->regs[2]) & 0xffffffff; | |
70 | printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n", | |
71 | ah, al, bh, bl, ch, cl); | |
72 | ||
73 | ah = (regs->regs[3]) >> 32; | |
74 | al = (regs->regs[3]) & 0xffffffff; | |
75 | bh = (regs->regs[4]) >> 32; | |
76 | bl = (regs->regs[4]) & 0xffffffff; | |
77 | ch = (regs->regs[5]) >> 32; | |
78 | cl = (regs->regs[5]) & 0xffffffff; | |
79 | printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n", | |
80 | ah, al, bh, bl, ch, cl); | |
81 | ||
82 | ah = (regs->regs[6]) >> 32; | |
83 | al = (regs->regs[6]) & 0xffffffff; | |
84 | bh = (regs->regs[7]) >> 32; | |
85 | bl = (regs->regs[7]) & 0xffffffff; | |
86 | ch = (regs->regs[8]) >> 32; | |
87 | cl = (regs->regs[8]) & 0xffffffff; | |
88 | printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n", | |
89 | ah, al, bh, bl, ch, cl); | |
90 | ||
91 | ah = (regs->regs[9]) >> 32; | |
92 | al = (regs->regs[9]) & 0xffffffff; | |
93 | bh = (regs->regs[10]) >> 32; | |
94 | bl = (regs->regs[10]) & 0xffffffff; | |
95 | ch = (regs->regs[11]) >> 32; | |
96 | cl = (regs->regs[11]) & 0xffffffff; | |
97 | printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n", | |
98 | ah, al, bh, bl, ch, cl); | |
99 | ||
100 | ah = (regs->regs[12]) >> 32; | |
101 | al = (regs->regs[12]) & 0xffffffff; | |
102 | bh = (regs->regs[13]) >> 32; | |
103 | bl = (regs->regs[13]) & 0xffffffff; | |
104 | ch = (regs->regs[14]) >> 32; | |
105 | cl = (regs->regs[14]) & 0xffffffff; | |
106 | printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n", | |
107 | ah, al, bh, bl, ch, cl); | |
108 | ||
109 | ah = (regs->regs[16]) >> 32; | |
110 | al = (regs->regs[16]) & 0xffffffff; | |
111 | bh = (regs->regs[17]) >> 32; | |
112 | bl = (regs->regs[17]) & 0xffffffff; | |
113 | ch = (regs->regs[19]) >> 32; | |
114 | cl = (regs->regs[19]) & 0xffffffff; | |
115 | printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n", | |
116 | ah, al, bh, bl, ch, cl); | |
117 | ||
118 | ah = (regs->regs[20]) >> 32; | |
119 | al = (regs->regs[20]) & 0xffffffff; | |
120 | bh = (regs->regs[21]) >> 32; | |
121 | bl = (regs->regs[21]) & 0xffffffff; | |
122 | ch = (regs->regs[22]) >> 32; | |
123 | cl = (regs->regs[22]) & 0xffffffff; | |
124 | printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n", | |
125 | ah, al, bh, bl, ch, cl); | |
126 | ||
127 | ah = (regs->regs[23]) >> 32; | |
128 | al = (regs->regs[23]) & 0xffffffff; | |
129 | bh = (regs->regs[24]) >> 32; | |
130 | bl = (regs->regs[24]) & 0xffffffff; | |
131 | ch = (regs->regs[25]) >> 32; | |
132 | cl = (regs->regs[25]) & 0xffffffff; | |
133 | printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n", | |
134 | ah, al, bh, bl, ch, cl); | |
135 | ||
136 | ah = (regs->regs[26]) >> 32; | |
137 | al = (regs->regs[26]) & 0xffffffff; | |
138 | bh = (regs->regs[27]) >> 32; | |
139 | bl = (regs->regs[27]) & 0xffffffff; | |
140 | ch = (regs->regs[28]) >> 32; | |
141 | cl = (regs->regs[28]) & 0xffffffff; | |
142 | printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n", | |
143 | ah, al, bh, bl, ch, cl); | |
144 | ||
145 | ah = (regs->regs[29]) >> 32; | |
146 | al = (regs->regs[29]) & 0xffffffff; | |
147 | bh = (regs->regs[30]) >> 32; | |
148 | bl = (regs->regs[30]) & 0xffffffff; | |
149 | ch = (regs->regs[31]) >> 32; | |
150 | cl = (regs->regs[31]) & 0xffffffff; | |
151 | printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n", | |
152 | ah, al, bh, bl, ch, cl); | |
153 | ||
154 | ah = (regs->regs[32]) >> 32; | |
155 | al = (regs->regs[32]) & 0xffffffff; | |
156 | bh = (regs->regs[33]) >> 32; | |
157 | bl = (regs->regs[33]) & 0xffffffff; | |
158 | ch = (regs->regs[34]) >> 32; | |
159 | cl = (regs->regs[34]) & 0xffffffff; | |
160 | printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n", | |
161 | ah, al, bh, bl, ch, cl); | |
162 | ||
163 | ah = (regs->regs[35]) >> 32; | |
164 | al = (regs->regs[35]) & 0xffffffff; | |
165 | bh = (regs->regs[36]) >> 32; | |
166 | bl = (regs->regs[36]) & 0xffffffff; | |
167 | ch = (regs->regs[37]) >> 32; | |
168 | cl = (regs->regs[37]) & 0xffffffff; | |
169 | printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n", | |
170 | ah, al, bh, bl, ch, cl); | |
171 | ||
172 | ah = (regs->regs[38]) >> 32; | |
173 | al = (regs->regs[38]) & 0xffffffff; | |
174 | bh = (regs->regs[39]) >> 32; | |
175 | bl = (regs->regs[39]) & 0xffffffff; | |
176 | ch = (regs->regs[40]) >> 32; | |
177 | cl = (regs->regs[40]) & 0xffffffff; | |
178 | printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n", | |
179 | ah, al, bh, bl, ch, cl); | |
180 | ||
181 | ah = (regs->regs[41]) >> 32; | |
182 | al = (regs->regs[41]) & 0xffffffff; | |
183 | bh = (regs->regs[42]) >> 32; | |
184 | bl = (regs->regs[42]) & 0xffffffff; | |
185 | ch = (regs->regs[43]) >> 32; | |
186 | cl = (regs->regs[43]) & 0xffffffff; | |
187 | printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n", | |
188 | ah, al, bh, bl, ch, cl); | |
189 | ||
190 | ah = (regs->regs[44]) >> 32; | |
191 | al = (regs->regs[44]) & 0xffffffff; | |
192 | bh = (regs->regs[45]) >> 32; | |
193 | bl = (regs->regs[45]) & 0xffffffff; | |
194 | ch = (regs->regs[46]) >> 32; | |
195 | cl = (regs->regs[46]) & 0xffffffff; | |
196 | printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n", | |
197 | ah, al, bh, bl, ch, cl); | |
198 | ||
199 | ah = (regs->regs[47]) >> 32; | |
200 | al = (regs->regs[47]) & 0xffffffff; | |
201 | bh = (regs->regs[48]) >> 32; | |
202 | bl = (regs->regs[48]) & 0xffffffff; | |
203 | ch = (regs->regs[49]) >> 32; | |
204 | cl = (regs->regs[49]) & 0xffffffff; | |
205 | printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n", | |
206 | ah, al, bh, bl, ch, cl); | |
207 | ||
208 | ah = (regs->regs[50]) >> 32; | |
209 | al = (regs->regs[50]) & 0xffffffff; | |
210 | bh = (regs->regs[51]) >> 32; | |
211 | bl = (regs->regs[51]) & 0xffffffff; | |
212 | ch = (regs->regs[52]) >> 32; | |
213 | cl = (regs->regs[52]) & 0xffffffff; | |
214 | printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n", | |
215 | ah, al, bh, bl, ch, cl); | |
216 | ||
217 | ah = (regs->regs[53]) >> 32; | |
218 | al = (regs->regs[53]) & 0xffffffff; | |
219 | bh = (regs->regs[54]) >> 32; | |
220 | bl = (regs->regs[54]) & 0xffffffff; | |
221 | ch = (regs->regs[55]) >> 32; | |
222 | cl = (regs->regs[55]) & 0xffffffff; | |
223 | printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n", | |
224 | ah, al, bh, bl, ch, cl); | |
225 | ||
226 | ah = (regs->regs[56]) >> 32; | |
227 | al = (regs->regs[56]) & 0xffffffff; | |
228 | bh = (regs->regs[57]) >> 32; | |
229 | bl = (regs->regs[57]) & 0xffffffff; | |
230 | ch = (regs->regs[58]) >> 32; | |
231 | cl = (regs->regs[58]) & 0xffffffff; | |
232 | printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n", | |
233 | ah, al, bh, bl, ch, cl); | |
234 | ||
235 | ah = (regs->regs[59]) >> 32; | |
236 | al = (regs->regs[59]) & 0xffffffff; | |
237 | bh = (regs->regs[60]) >> 32; | |
238 | bl = (regs->regs[60]) & 0xffffffff; | |
239 | ch = (regs->regs[61]) >> 32; | |
240 | cl = (regs->regs[61]) & 0xffffffff; | |
241 | printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n", | |
242 | ah, al, bh, bl, ch, cl); | |
243 | ||
244 | ah = (regs->regs[62]) >> 32; | |
245 | al = (regs->regs[62]) & 0xffffffff; | |
246 | bh = (regs->tregs[0]) >> 32; | |
247 | bl = (regs->tregs[0]) & 0xffffffff; | |
248 | ch = (regs->tregs[1]) >> 32; | |
249 | cl = (regs->tregs[1]) & 0xffffffff; | |
250 | printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n", | |
251 | ah, al, bh, bl, ch, cl); | |
252 | ||
253 | ah = (regs->tregs[2]) >> 32; | |
254 | al = (regs->tregs[2]) & 0xffffffff; | |
255 | bh = (regs->tregs[3]) >> 32; | |
256 | bl = (regs->tregs[3]) & 0xffffffff; | |
257 | ch = (regs->tregs[4]) >> 32; | |
258 | cl = (regs->tregs[4]) & 0xffffffff; | |
259 | printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n", | |
260 | ah, al, bh, bl, ch, cl); | |
261 | ||
262 | ah = (regs->tregs[5]) >> 32; | |
263 | al = (regs->tregs[5]) & 0xffffffff; | |
264 | bh = (regs->tregs[6]) >> 32; | |
265 | bl = (regs->tregs[6]) & 0xffffffff; | |
266 | ch = (regs->tregs[7]) >> 32; | |
267 | cl = (regs->tregs[7]) & 0xffffffff; | |
268 | printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n", | |
269 | ah, al, bh, bl, ch, cl); | |
270 | ||
271 | /* | |
272 | * If we're in kernel mode, dump the stack too.. | |
273 | */ | |
274 | if (!user_mode(regs)) { | |
275 | void show_stack(struct task_struct *tsk, unsigned long *sp); | |
276 | unsigned long sp = regs->regs[15] & 0xffffffff; | |
277 | struct task_struct *tsk = get_current(); | |
278 | ||
279 | tsk->thread.kregs = regs; | |
280 | ||
281 | show_stack(tsk, (unsigned long *)sp); | |
282 | } | |
283 | } | |
284 | ||
1da177e4 LT |
285 | /* |
286 | * Create a kernel thread | |
287 | */ | |
821278a7 AB |
288 | ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *)) |
289 | { | |
290 | do_exit(fn(arg)); | |
291 | } | |
1da177e4 LT |
292 | |
293 | /* | |
294 | * This is the mechanism for creating a new kernel thread. | |
295 | * | |
296 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
297 | * who haven't done an "execve()") should use this: it will work within | |
298 | * a system call from a "real" process, but the process memory space will | |
0a354775 | 299 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
300 | */ |
301 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
302 | { | |
821278a7 | 303 | struct pt_regs regs; |
1da177e4 | 304 | |
821278a7 AB |
305 | memset(®s, 0, sizeof(regs)); |
306 | regs.regs[2] = (unsigned long)arg; | |
307 | regs.regs[3] = (unsigned long)fn; | |
1da177e4 | 308 | |
821278a7 AB |
309 | regs.pc = (unsigned long)kernel_thread_helper; |
310 | regs.sr = (1 << 30); | |
1da177e4 | 311 | |
3d58695e | 312 | /* Ok, create the new process.. */ |
4505ffda | 313 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
3d58695e | 314 | ®s, 0, NULL, NULL); |
1da177e4 | 315 | } |
4c978ca3 | 316 | EXPORT_SYMBOL(kernel_thread); |
1da177e4 LT |
317 | |
318 | /* | |
319 | * Free current thread data structures etc.. | |
320 | */ | |
321 | void exit_thread(void) | |
322 | { | |
a23ba435 PM |
323 | /* |
324 | * See arch/sparc/kernel/process.c for the precedent for doing | |
325 | * this -- RPC. | |
326 | * | |
327 | * The SH-5 FPU save/restore approach relies on | |
328 | * last_task_used_math pointing to a live task_struct. When | |
329 | * another task tries to use the FPU for the 1st time, the FPUDIS | |
330 | * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the | |
331 | * existing FPU state to the FP regs field within | |
332 | * last_task_used_math before re-loading the new task's FPU state | |
333 | * (or initialising it if the FPU has been used before). So if | |
334 | * last_task_used_math is stale, and its page has already been | |
335 | * re-allocated for another use, the consequences are rather | |
336 | * grim. Unless we null it here, there is no other path through | |
337 | * which it would get safely nulled. | |
338 | */ | |
1da177e4 LT |
339 | #ifdef CONFIG_SH_FPU |
340 | if (last_task_used_math == current) { | |
341 | last_task_used_math = NULL; | |
342 | } | |
343 | #endif | |
344 | } | |
345 | ||
346 | void flush_thread(void) | |
347 | { | |
348 | ||
221af7f8 | 349 | /* Called by fs/exec.c (setup_new_exec) to remove traces of a |
1da177e4 LT |
350 | * previously running executable. */ |
351 | #ifdef CONFIG_SH_FPU | |
352 | if (last_task_used_math == current) { | |
353 | last_task_used_math = NULL; | |
354 | } | |
355 | /* Force FPU state to be reinitialised after exec */ | |
356 | clear_used_math(); | |
357 | #endif | |
358 | ||
359 | /* if we are a kernel thread, about to change to user thread, | |
360 | * update kreg | |
361 | */ | |
362 | if(current->thread.kregs==&fake_swapper_regs) { | |
363 | current->thread.kregs = | |
364 | ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); | |
365 | current->thread.uregs = current->thread.kregs; | |
366 | } | |
367 | } | |
368 | ||
369 | void release_thread(struct task_struct *dead_task) | |
370 | { | |
371 | /* do nothing */ | |
372 | } | |
373 | ||
374 | /* Fill in the fpu structure for a core dump.. */ | |
375 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
376 | { | |
377 | #ifdef CONFIG_SH_FPU | |
378 | int fpvalid; | |
379 | struct task_struct *tsk = current; | |
380 | ||
381 | fpvalid = !!tsk_used_math(tsk); | |
382 | if (fpvalid) { | |
383 | if (current == last_task_used_math) { | |
600ee240 | 384 | enable_fpu(); |
61cc7b0a | 385 | save_fpu(tsk); |
600ee240 | 386 | disable_fpu(); |
1da177e4 LT |
387 | last_task_used_math = 0; |
388 | regs->sr |= SR_FD; | |
389 | } | |
390 | ||
3ef2932b | 391 | memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu)); |
1da177e4 LT |
392 | } |
393 | ||
394 | return fpvalid; | |
395 | #else | |
396 | return 0; /* Task didn't use the fpu at all. */ | |
397 | #endif | |
398 | } | |
4c978ca3 | 399 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 LT |
400 | |
401 | asmlinkage void ret_from_fork(void); | |
402 | ||
6f2c55b8 | 403 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
1da177e4 LT |
404 | unsigned long unused, |
405 | struct task_struct *p, struct pt_regs *regs) | |
406 | { | |
407 | struct pt_regs *childregs; | |
1da177e4 LT |
408 | |
409 | #ifdef CONFIG_SH_FPU | |
410 | if(last_task_used_math == current) { | |
600ee240 | 411 | enable_fpu(); |
61cc7b0a | 412 | save_fpu(current); |
600ee240 | 413 | disable_fpu(); |
1da177e4 LT |
414 | last_task_used_math = NULL; |
415 | regs->sr |= SR_FD; | |
416 | } | |
417 | #endif | |
418 | /* Copy from sh version */ | |
ee8c1dd4 | 419 | childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1; |
1da177e4 LT |
420 | |
421 | *childregs = *regs; | |
422 | ||
c7914834 PM |
423 | /* |
424 | * Sign extend the edited stack. | |
425 | * Note that thread.pc and thread.pc will stay | |
426 | * 32-bit wide and context switch must take care | |
427 | * of NEFF sign extension. | |
428 | */ | |
1da177e4 | 429 | if (user_mode(regs)) { |
c7914834 | 430 | childregs->regs[15] = neff_sign_extend(usp); |
1da177e4 LT |
431 | p->thread.uregs = childregs; |
432 | } else { | |
c7914834 PM |
433 | childregs->regs[15] = |
434 | neff_sign_extend((unsigned long)task_stack_page(p) + | |
435 | THREAD_SIZE); | |
1da177e4 LT |
436 | } |
437 | ||
438 | childregs->regs[9] = 0; /* Set return value for child */ | |
439 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ | |
440 | ||
441 | p->thread.sp = (unsigned long) childregs; | |
442 | p->thread.pc = (unsigned long) ret_from_fork; | |
443 | ||
1da177e4 LT |
444 | return 0; |
445 | } | |
446 | ||
1da177e4 LT |
447 | asmlinkage int sys_fork(unsigned long r2, unsigned long r3, |
448 | unsigned long r4, unsigned long r5, | |
449 | unsigned long r6, unsigned long r7, | |
450 | struct pt_regs *pregs) | |
451 | { | |
452 | return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
453 | } | |
454 | ||
455 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
456 | unsigned long r4, unsigned long r5, | |
457 | unsigned long r6, unsigned long r7, | |
458 | struct pt_regs *pregs) | |
459 | { | |
460 | if (!newsp) | |
461 | newsp = pregs->regs[15]; | |
462 | return do_fork(clone_flags, newsp, pregs, 0, 0, 0); | |
463 | } | |
464 | ||
465 | /* | |
466 | * This is trivial, and on the face of it looks like it | |
467 | * could equally well be done in user mode. | |
468 | * | |
469 | * Not so, for quite unobvious reasons - register pressure. | |
470 | * In user mode vfork() cannot have a stack frame, and if | |
471 | * done by calling the "clone()" system call directly, you | |
472 | * do not have enough call-clobbered registers to hold all | |
473 | * the information you need. | |
474 | */ | |
475 | asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, | |
476 | unsigned long r4, unsigned long r5, | |
477 | unsigned long r6, unsigned long r7, | |
478 | struct pt_regs *pregs) | |
479 | { | |
480 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
481 | } | |
482 | ||
483 | /* | |
484 | * sys_execve() executes a new program. | |
485 | */ | |
486 | asmlinkage int sys_execve(char *ufilename, char **uargv, | |
487 | char **uenvp, unsigned long r5, | |
488 | unsigned long r6, unsigned long r7, | |
489 | struct pt_regs *pregs) | |
490 | { | |
491 | int error; | |
492 | char *filename; | |
493 | ||
1da177e4 LT |
494 | filename = getname((char __user *)ufilename); |
495 | error = PTR_ERR(filename); | |
496 | if (IS_ERR(filename)) | |
497 | goto out; | |
498 | ||
499 | error = do_execve(filename, | |
500 | (char __user * __user *)uargv, | |
501 | (char __user * __user *)uenvp, | |
502 | pregs); | |
1da177e4 LT |
503 | putname(filename); |
504 | out: | |
1da177e4 LT |
505 | return error; |
506 | } | |
507 | ||
43081e18 | 508 | #ifdef CONFIG_FRAME_POINTER |
1da177e4 LT |
509 | static int in_sh64_switch_to(unsigned long pc) |
510 | { | |
511 | extern char __sh64_switch_to_end; | |
512 | /* For a sleeping task, the PC is somewhere in the middle of the function, | |
513 | so we don't have to worry about masking the LSB off */ | |
514 | return (pc >= (unsigned long) sh64_switch_to) && | |
515 | (pc < (unsigned long) &__sh64_switch_to_end); | |
516 | } | |
43081e18 | 517 | #endif |
1da177e4 LT |
518 | |
519 | unsigned long get_wchan(struct task_struct *p) | |
520 | { | |
1da177e4 LT |
521 | unsigned long pc; |
522 | ||
523 | if (!p || p == current || p->state == TASK_RUNNING) | |
524 | return 0; | |
525 | ||
526 | /* | |
527 | * The same comment as on the Alpha applies here, too ... | |
528 | */ | |
529 | pc = thread_saved_pc(p); | |
530 | ||
531 | #ifdef CONFIG_FRAME_POINTER | |
532 | if (in_sh64_switch_to(pc)) { | |
43081e18 PM |
533 | unsigned long schedule_fp; |
534 | unsigned long sh64_switch_to_fp; | |
535 | unsigned long schedule_caller_pc; | |
536 | ||
1da177e4 LT |
537 | sh64_switch_to_fp = (long) p->thread.sp; |
538 | /* r14 is saved at offset 4 in the sh64_switch_to frame */ | |
539 | schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); | |
540 | ||
541 | /* and the caller of 'schedule' is (currently!) saved at offset 24 | |
542 | in the frame of schedule (from disasm) */ | |
543 | schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); | |
544 | return schedule_caller_pc; | |
545 | } | |
546 | #endif | |
547 | return pc; | |
548 | } |