Commit | Line | Data |
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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> |
e839ca52 | 33 | #include <asm/switch_to.h> |
1da177e4 LT |
34 | |
35 | struct task_struct *last_task_used_math = NULL; | |
3a9485da | 36 | struct pt_regs fake_swapper_regs = { 0, }; |
1da177e4 | 37 | |
fbb82b03 | 38 | void show_regs(struct pt_regs *regs) |
1da177e4 LT |
39 | { |
40 | unsigned long long ah, al, bh, bl, ch, cl; | |
41 | ||
42 | printk("\n"); | |
43 | ||
44 | ah = (regs->pc) >> 32; | |
45 | al = (regs->pc) & 0xffffffff; | |
46 | bh = (regs->regs[18]) >> 32; | |
47 | bl = (regs->regs[18]) & 0xffffffff; | |
48 | ch = (regs->regs[15]) >> 32; | |
49 | cl = (regs->regs[15]) & 0xffffffff; | |
50 | printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n", | |
51 | ah, al, bh, bl, ch, cl); | |
52 | ||
53 | ah = (regs->sr) >> 32; | |
54 | al = (regs->sr) & 0xffffffff; | |
55 | asm volatile ("getcon " __TEA ", %0" : "=r" (bh)); | |
56 | asm volatile ("getcon " __TEA ", %0" : "=r" (bl)); | |
57 | bh = (bh) >> 32; | |
58 | bl = (bl) & 0xffffffff; | |
59 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); | |
60 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); | |
61 | ch = (ch) >> 32; | |
62 | cl = (cl) & 0xffffffff; | |
63 | printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", | |
64 | ah, al, bh, bl, ch, cl); | |
65 | ||
66 | ah = (regs->regs[0]) >> 32; | |
67 | al = (regs->regs[0]) & 0xffffffff; | |
68 | bh = (regs->regs[1]) >> 32; | |
69 | bl = (regs->regs[1]) & 0xffffffff; | |
70 | ch = (regs->regs[2]) >> 32; | |
71 | cl = (regs->regs[2]) & 0xffffffff; | |
72 | printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n", | |
73 | ah, al, bh, bl, ch, cl); | |
74 | ||
75 | ah = (regs->regs[3]) >> 32; | |
76 | al = (regs->regs[3]) & 0xffffffff; | |
77 | bh = (regs->regs[4]) >> 32; | |
78 | bl = (regs->regs[4]) & 0xffffffff; | |
79 | ch = (regs->regs[5]) >> 32; | |
80 | cl = (regs->regs[5]) & 0xffffffff; | |
81 | printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n", | |
82 | ah, al, bh, bl, ch, cl); | |
83 | ||
84 | ah = (regs->regs[6]) >> 32; | |
85 | al = (regs->regs[6]) & 0xffffffff; | |
86 | bh = (regs->regs[7]) >> 32; | |
87 | bl = (regs->regs[7]) & 0xffffffff; | |
88 | ch = (regs->regs[8]) >> 32; | |
89 | cl = (regs->regs[8]) & 0xffffffff; | |
90 | printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n", | |
91 | ah, al, bh, bl, ch, cl); | |
92 | ||
93 | ah = (regs->regs[9]) >> 32; | |
94 | al = (regs->regs[9]) & 0xffffffff; | |
95 | bh = (regs->regs[10]) >> 32; | |
96 | bl = (regs->regs[10]) & 0xffffffff; | |
97 | ch = (regs->regs[11]) >> 32; | |
98 | cl = (regs->regs[11]) & 0xffffffff; | |
99 | printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n", | |
100 | ah, al, bh, bl, ch, cl); | |
101 | ||
102 | ah = (regs->regs[12]) >> 32; | |
103 | al = (regs->regs[12]) & 0xffffffff; | |
104 | bh = (regs->regs[13]) >> 32; | |
105 | bl = (regs->regs[13]) & 0xffffffff; | |
106 | ch = (regs->regs[14]) >> 32; | |
107 | cl = (regs->regs[14]) & 0xffffffff; | |
108 | printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n", | |
109 | ah, al, bh, bl, ch, cl); | |
110 | ||
111 | ah = (regs->regs[16]) >> 32; | |
112 | al = (regs->regs[16]) & 0xffffffff; | |
113 | bh = (regs->regs[17]) >> 32; | |
114 | bl = (regs->regs[17]) & 0xffffffff; | |
115 | ch = (regs->regs[19]) >> 32; | |
116 | cl = (regs->regs[19]) & 0xffffffff; | |
117 | printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n", | |
118 | ah, al, bh, bl, ch, cl); | |
119 | ||
120 | ah = (regs->regs[20]) >> 32; | |
121 | al = (regs->regs[20]) & 0xffffffff; | |
122 | bh = (regs->regs[21]) >> 32; | |
123 | bl = (regs->regs[21]) & 0xffffffff; | |
124 | ch = (regs->regs[22]) >> 32; | |
125 | cl = (regs->regs[22]) & 0xffffffff; | |
126 | printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n", | |
127 | ah, al, bh, bl, ch, cl); | |
128 | ||
129 | ah = (regs->regs[23]) >> 32; | |
130 | al = (regs->regs[23]) & 0xffffffff; | |
131 | bh = (regs->regs[24]) >> 32; | |
132 | bl = (regs->regs[24]) & 0xffffffff; | |
133 | ch = (regs->regs[25]) >> 32; | |
134 | cl = (regs->regs[25]) & 0xffffffff; | |
135 | printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n", | |
136 | ah, al, bh, bl, ch, cl); | |
137 | ||
138 | ah = (regs->regs[26]) >> 32; | |
139 | al = (regs->regs[26]) & 0xffffffff; | |
140 | bh = (regs->regs[27]) >> 32; | |
141 | bl = (regs->regs[27]) & 0xffffffff; | |
142 | ch = (regs->regs[28]) >> 32; | |
143 | cl = (regs->regs[28]) & 0xffffffff; | |
144 | printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n", | |
145 | ah, al, bh, bl, ch, cl); | |
146 | ||
147 | ah = (regs->regs[29]) >> 32; | |
148 | al = (regs->regs[29]) & 0xffffffff; | |
149 | bh = (regs->regs[30]) >> 32; | |
150 | bl = (regs->regs[30]) & 0xffffffff; | |
151 | ch = (regs->regs[31]) >> 32; | |
152 | cl = (regs->regs[31]) & 0xffffffff; | |
153 | printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n", | |
154 | ah, al, bh, bl, ch, cl); | |
155 | ||
156 | ah = (regs->regs[32]) >> 32; | |
157 | al = (regs->regs[32]) & 0xffffffff; | |
158 | bh = (regs->regs[33]) >> 32; | |
159 | bl = (regs->regs[33]) & 0xffffffff; | |
160 | ch = (regs->regs[34]) >> 32; | |
161 | cl = (regs->regs[34]) & 0xffffffff; | |
162 | printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n", | |
163 | ah, al, bh, bl, ch, cl); | |
164 | ||
165 | ah = (regs->regs[35]) >> 32; | |
166 | al = (regs->regs[35]) & 0xffffffff; | |
167 | bh = (regs->regs[36]) >> 32; | |
168 | bl = (regs->regs[36]) & 0xffffffff; | |
169 | ch = (regs->regs[37]) >> 32; | |
170 | cl = (regs->regs[37]) & 0xffffffff; | |
171 | printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n", | |
172 | ah, al, bh, bl, ch, cl); | |
173 | ||
174 | ah = (regs->regs[38]) >> 32; | |
175 | al = (regs->regs[38]) & 0xffffffff; | |
176 | bh = (regs->regs[39]) >> 32; | |
177 | bl = (regs->regs[39]) & 0xffffffff; | |
178 | ch = (regs->regs[40]) >> 32; | |
179 | cl = (regs->regs[40]) & 0xffffffff; | |
180 | printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n", | |
181 | ah, al, bh, bl, ch, cl); | |
182 | ||
183 | ah = (regs->regs[41]) >> 32; | |
184 | al = (regs->regs[41]) & 0xffffffff; | |
185 | bh = (regs->regs[42]) >> 32; | |
186 | bl = (regs->regs[42]) & 0xffffffff; | |
187 | ch = (regs->regs[43]) >> 32; | |
188 | cl = (regs->regs[43]) & 0xffffffff; | |
189 | printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n", | |
190 | ah, al, bh, bl, ch, cl); | |
191 | ||
192 | ah = (regs->regs[44]) >> 32; | |
193 | al = (regs->regs[44]) & 0xffffffff; | |
194 | bh = (regs->regs[45]) >> 32; | |
195 | bl = (regs->regs[45]) & 0xffffffff; | |
196 | ch = (regs->regs[46]) >> 32; | |
197 | cl = (regs->regs[46]) & 0xffffffff; | |
198 | printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n", | |
199 | ah, al, bh, bl, ch, cl); | |
200 | ||
201 | ah = (regs->regs[47]) >> 32; | |
202 | al = (regs->regs[47]) & 0xffffffff; | |
203 | bh = (regs->regs[48]) >> 32; | |
204 | bl = (regs->regs[48]) & 0xffffffff; | |
205 | ch = (regs->regs[49]) >> 32; | |
206 | cl = (regs->regs[49]) & 0xffffffff; | |
207 | printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n", | |
208 | ah, al, bh, bl, ch, cl); | |
209 | ||
210 | ah = (regs->regs[50]) >> 32; | |
211 | al = (regs->regs[50]) & 0xffffffff; | |
212 | bh = (regs->regs[51]) >> 32; | |
213 | bl = (regs->regs[51]) & 0xffffffff; | |
214 | ch = (regs->regs[52]) >> 32; | |
215 | cl = (regs->regs[52]) & 0xffffffff; | |
216 | printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n", | |
217 | ah, al, bh, bl, ch, cl); | |
218 | ||
219 | ah = (regs->regs[53]) >> 32; | |
220 | al = (regs->regs[53]) & 0xffffffff; | |
221 | bh = (regs->regs[54]) >> 32; | |
222 | bl = (regs->regs[54]) & 0xffffffff; | |
223 | ch = (regs->regs[55]) >> 32; | |
224 | cl = (regs->regs[55]) & 0xffffffff; | |
225 | printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n", | |
226 | ah, al, bh, bl, ch, cl); | |
227 | ||
228 | ah = (regs->regs[56]) >> 32; | |
229 | al = (regs->regs[56]) & 0xffffffff; | |
230 | bh = (regs->regs[57]) >> 32; | |
231 | bl = (regs->regs[57]) & 0xffffffff; | |
232 | ch = (regs->regs[58]) >> 32; | |
233 | cl = (regs->regs[58]) & 0xffffffff; | |
234 | printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n", | |
235 | ah, al, bh, bl, ch, cl); | |
236 | ||
237 | ah = (regs->regs[59]) >> 32; | |
238 | al = (regs->regs[59]) & 0xffffffff; | |
239 | bh = (regs->regs[60]) >> 32; | |
240 | bl = (regs->regs[60]) & 0xffffffff; | |
241 | ch = (regs->regs[61]) >> 32; | |
242 | cl = (regs->regs[61]) & 0xffffffff; | |
243 | printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n", | |
244 | ah, al, bh, bl, ch, cl); | |
245 | ||
246 | ah = (regs->regs[62]) >> 32; | |
247 | al = (regs->regs[62]) & 0xffffffff; | |
248 | bh = (regs->tregs[0]) >> 32; | |
249 | bl = (regs->tregs[0]) & 0xffffffff; | |
250 | ch = (regs->tregs[1]) >> 32; | |
251 | cl = (regs->tregs[1]) & 0xffffffff; | |
252 | printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n", | |
253 | ah, al, bh, bl, ch, cl); | |
254 | ||
255 | ah = (regs->tregs[2]) >> 32; | |
256 | al = (regs->tregs[2]) & 0xffffffff; | |
257 | bh = (regs->tregs[3]) >> 32; | |
258 | bl = (regs->tregs[3]) & 0xffffffff; | |
259 | ch = (regs->tregs[4]) >> 32; | |
260 | cl = (regs->tregs[4]) & 0xffffffff; | |
261 | printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n", | |
262 | ah, al, bh, bl, ch, cl); | |
263 | ||
264 | ah = (regs->tregs[5]) >> 32; | |
265 | al = (regs->tregs[5]) & 0xffffffff; | |
266 | bh = (regs->tregs[6]) >> 32; | |
267 | bl = (regs->tregs[6]) & 0xffffffff; | |
268 | ch = (regs->tregs[7]) >> 32; | |
269 | cl = (regs->tregs[7]) & 0xffffffff; | |
270 | printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n", | |
271 | ah, al, bh, bl, ch, cl); | |
272 | ||
273 | /* | |
274 | * If we're in kernel mode, dump the stack too.. | |
275 | */ | |
276 | if (!user_mode(regs)) { | |
277 | void show_stack(struct task_struct *tsk, unsigned long *sp); | |
278 | unsigned long sp = regs->regs[15] & 0xffffffff; | |
279 | struct task_struct *tsk = get_current(); | |
280 | ||
281 | tsk->thread.kregs = regs; | |
282 | ||
283 | show_stack(tsk, (unsigned long *)sp); | |
284 | } | |
285 | } | |
286 | ||
1da177e4 LT |
287 | /* |
288 | * Create a kernel thread | |
289 | */ | |
ff2d8b19 | 290 | __noreturn void kernel_thread_helper(void *arg, int (*fn)(void *)) |
821278a7 AB |
291 | { |
292 | do_exit(fn(arg)); | |
293 | } | |
1da177e4 LT |
294 | |
295 | /* | |
296 | * This is the mechanism for creating a new kernel thread. | |
297 | * | |
298 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
299 | * who haven't done an "execve()") should use this: it will work within | |
300 | * a system call from a "real" process, but the process memory space will | |
0a354775 | 301 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
302 | */ |
303 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
304 | { | |
821278a7 | 305 | struct pt_regs regs; |
1da177e4 | 306 | |
821278a7 AB |
307 | memset(®s, 0, sizeof(regs)); |
308 | regs.regs[2] = (unsigned long)arg; | |
309 | regs.regs[3] = (unsigned long)fn; | |
1da177e4 | 310 | |
821278a7 AB |
311 | regs.pc = (unsigned long)kernel_thread_helper; |
312 | regs.sr = (1 << 30); | |
1da177e4 | 313 | |
3d58695e | 314 | /* Ok, create the new process.. */ |
4505ffda | 315 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
3d58695e | 316 | ®s, 0, NULL, NULL); |
1da177e4 | 317 | } |
4c978ca3 | 318 | EXPORT_SYMBOL(kernel_thread); |
1da177e4 LT |
319 | |
320 | /* | |
321 | * Free current thread data structures etc.. | |
322 | */ | |
323 | void exit_thread(void) | |
324 | { | |
a23ba435 PM |
325 | /* |
326 | * See arch/sparc/kernel/process.c for the precedent for doing | |
327 | * this -- RPC. | |
328 | * | |
329 | * The SH-5 FPU save/restore approach relies on | |
330 | * last_task_used_math pointing to a live task_struct. When | |
331 | * another task tries to use the FPU for the 1st time, the FPUDIS | |
332 | * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the | |
333 | * existing FPU state to the FP regs field within | |
334 | * last_task_used_math before re-loading the new task's FPU state | |
335 | * (or initialising it if the FPU has been used before). So if | |
336 | * last_task_used_math is stale, and its page has already been | |
337 | * re-allocated for another use, the consequences are rather | |
338 | * grim. Unless we null it here, there is no other path through | |
339 | * which it would get safely nulled. | |
340 | */ | |
1da177e4 LT |
341 | #ifdef CONFIG_SH_FPU |
342 | if (last_task_used_math == current) { | |
343 | last_task_used_math = NULL; | |
344 | } | |
345 | #endif | |
346 | } | |
347 | ||
348 | void flush_thread(void) | |
349 | { | |
350 | ||
221af7f8 | 351 | /* Called by fs/exec.c (setup_new_exec) to remove traces of a |
1da177e4 LT |
352 | * previously running executable. */ |
353 | #ifdef CONFIG_SH_FPU | |
354 | if (last_task_used_math == current) { | |
355 | last_task_used_math = NULL; | |
356 | } | |
357 | /* Force FPU state to be reinitialised after exec */ | |
358 | clear_used_math(); | |
359 | #endif | |
360 | ||
361 | /* if we are a kernel thread, about to change to user thread, | |
362 | * update kreg | |
363 | */ | |
364 | if(current->thread.kregs==&fake_swapper_regs) { | |
365 | current->thread.kregs = | |
366 | ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); | |
367 | current->thread.uregs = current->thread.kregs; | |
368 | } | |
369 | } | |
370 | ||
371 | void release_thread(struct task_struct *dead_task) | |
372 | { | |
373 | /* do nothing */ | |
374 | } | |
375 | ||
376 | /* Fill in the fpu structure for a core dump.. */ | |
377 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
378 | { | |
379 | #ifdef CONFIG_SH_FPU | |
380 | int fpvalid; | |
381 | struct task_struct *tsk = current; | |
382 | ||
383 | fpvalid = !!tsk_used_math(tsk); | |
384 | if (fpvalid) { | |
385 | if (current == last_task_used_math) { | |
600ee240 | 386 | enable_fpu(); |
61cc7b0a | 387 | save_fpu(tsk); |
600ee240 | 388 | disable_fpu(); |
1da177e4 LT |
389 | last_task_used_math = 0; |
390 | regs->sr |= SR_FD; | |
391 | } | |
392 | ||
3ef2932b | 393 | memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu)); |
1da177e4 LT |
394 | } |
395 | ||
396 | return fpvalid; | |
397 | #else | |
398 | return 0; /* Task didn't use the fpu at all. */ | |
399 | #endif | |
400 | } | |
4c978ca3 | 401 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 LT |
402 | |
403 | asmlinkage void ret_from_fork(void); | |
404 | ||
6f2c55b8 | 405 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
1da177e4 LT |
406 | unsigned long unused, |
407 | struct task_struct *p, struct pt_regs *regs) | |
408 | { | |
409 | struct pt_regs *childregs; | |
1da177e4 LT |
410 | |
411 | #ifdef CONFIG_SH_FPU | |
412 | if(last_task_used_math == current) { | |
600ee240 | 413 | enable_fpu(); |
61cc7b0a | 414 | save_fpu(current); |
600ee240 | 415 | disable_fpu(); |
1da177e4 LT |
416 | last_task_used_math = NULL; |
417 | regs->sr |= SR_FD; | |
418 | } | |
419 | #endif | |
420 | /* Copy from sh version */ | |
ee8c1dd4 | 421 | childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1; |
1da177e4 LT |
422 | |
423 | *childregs = *regs; | |
424 | ||
c7914834 PM |
425 | /* |
426 | * Sign extend the edited stack. | |
427 | * Note that thread.pc and thread.pc will stay | |
428 | * 32-bit wide and context switch must take care | |
429 | * of NEFF sign extension. | |
430 | */ | |
1da177e4 | 431 | if (user_mode(regs)) { |
c7914834 | 432 | childregs->regs[15] = neff_sign_extend(usp); |
1da177e4 LT |
433 | p->thread.uregs = childregs; |
434 | } else { | |
c7914834 PM |
435 | childregs->regs[15] = |
436 | neff_sign_extend((unsigned long)task_stack_page(p) + | |
437 | THREAD_SIZE); | |
1da177e4 LT |
438 | } |
439 | ||
440 | childregs->regs[9] = 0; /* Set return value for child */ | |
441 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ | |
442 | ||
443 | p->thread.sp = (unsigned long) childregs; | |
444 | p->thread.pc = (unsigned long) ret_from_fork; | |
445 | ||
1da177e4 LT |
446 | return 0; |
447 | } | |
448 | ||
1da177e4 LT |
449 | asmlinkage int sys_fork(unsigned long r2, unsigned long r3, |
450 | unsigned long r4, unsigned long r5, | |
451 | unsigned long r6, unsigned long r7, | |
452 | struct pt_regs *pregs) | |
453 | { | |
454 | return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
455 | } | |
456 | ||
457 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
458 | unsigned long r4, unsigned long r5, | |
459 | unsigned long r6, unsigned long r7, | |
460 | struct pt_regs *pregs) | |
461 | { | |
462 | if (!newsp) | |
463 | newsp = pregs->regs[15]; | |
464 | return do_fork(clone_flags, newsp, pregs, 0, 0, 0); | |
465 | } | |
466 | ||
467 | /* | |
468 | * This is trivial, and on the face of it looks like it | |
469 | * could equally well be done in user mode. | |
470 | * | |
471 | * Not so, for quite unobvious reasons - register pressure. | |
472 | * In user mode vfork() cannot have a stack frame, and if | |
473 | * done by calling the "clone()" system call directly, you | |
474 | * do not have enough call-clobbered registers to hold all | |
475 | * the information you need. | |
476 | */ | |
477 | asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, | |
478 | unsigned long r4, unsigned long r5, | |
479 | unsigned long r6, unsigned long r7, | |
480 | struct pt_regs *pregs) | |
481 | { | |
482 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
483 | } | |
484 | ||
485 | /* | |
486 | * sys_execve() executes a new program. | |
487 | */ | |
c7887325 | 488 | asmlinkage int sys_execve(const char *ufilename, char **uargv, |
1da177e4 LT |
489 | char **uenvp, unsigned long r5, |
490 | unsigned long r6, unsigned long r7, | |
491 | struct pt_regs *pregs) | |
492 | { | |
493 | int error; | |
494 | char *filename; | |
495 | ||
1da177e4 LT |
496 | filename = getname((char __user *)ufilename); |
497 | error = PTR_ERR(filename); | |
498 | if (IS_ERR(filename)) | |
499 | goto out; | |
500 | ||
501 | error = do_execve(filename, | |
d7627467 DH |
502 | (const char __user *const __user *)uargv, |
503 | (const char __user *const __user *)uenvp, | |
1da177e4 | 504 | pregs); |
1da177e4 LT |
505 | putname(filename); |
506 | out: | |
1da177e4 LT |
507 | return error; |
508 | } | |
509 | ||
43081e18 | 510 | #ifdef CONFIG_FRAME_POINTER |
1da177e4 LT |
511 | static int in_sh64_switch_to(unsigned long pc) |
512 | { | |
513 | extern char __sh64_switch_to_end; | |
514 | /* For a sleeping task, the PC is somewhere in the middle of the function, | |
515 | so we don't have to worry about masking the LSB off */ | |
516 | return (pc >= (unsigned long) sh64_switch_to) && | |
517 | (pc < (unsigned long) &__sh64_switch_to_end); | |
518 | } | |
43081e18 | 519 | #endif |
1da177e4 LT |
520 | |
521 | unsigned long get_wchan(struct task_struct *p) | |
522 | { | |
1da177e4 LT |
523 | unsigned long pc; |
524 | ||
525 | if (!p || p == current || p->state == TASK_RUNNING) | |
526 | return 0; | |
527 | ||
528 | /* | |
529 | * The same comment as on the Alpha applies here, too ... | |
530 | */ | |
531 | pc = thread_saved_pc(p); | |
532 | ||
533 | #ifdef CONFIG_FRAME_POINTER | |
534 | if (in_sh64_switch_to(pc)) { | |
43081e18 PM |
535 | unsigned long schedule_fp; |
536 | unsigned long sh64_switch_to_fp; | |
537 | unsigned long schedule_caller_pc; | |
538 | ||
1da177e4 LT |
539 | sh64_switch_to_fp = (long) p->thread.sp; |
540 | /* r14 is saved at offset 4 in the sh64_switch_to frame */ | |
541 | schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); | |
542 | ||
543 | /* and the caller of 'schedule' is (currently!) saved at offset 24 | |
544 | in the frame of schedule (from disasm) */ | |
545 | schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); | |
546 | return schedule_caller_pc; | |
547 | } | |
548 | #endif | |
549 | return pc; | |
550 | } |