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Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago. By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant. | |
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1 | /* |
2 | * arch/sh/kernel/process.c |
3 | * |
4 | * This file handles the architecture-dependent parts of process handling.. |
5 | * |
6 | * Copyright (C) 1995 Linus Torvalds |
7 | * |
8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima |
9 | * Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC |
10 | * Copyright (C) 2002 - 2008 Paul Mundt |
11 | * |
12 | * This file is subject to the terms and conditions of the GNU General Public |
13 | * License. See the file "COPYING" in the main directory of this archive |
14 | * for more details. |
15 | */ |
16 | #include <linux/module.h> |
17 | #include <linux/mm.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/elfcore.h> |
20 | #include <linux/kallsyms.h> |
21 | #include <linux/fs.h> |
22 | #include <linux/ftrace.h> |
23 | #include <linux/hw_breakpoint.h> |
24 | #include <linux/prefetch.h> |
25 | #include <asm/uaccess.h> |
26 | #include <asm/mmu_context.h> |
27 | #include <asm/system.h> |
28 | #include <asm/fpu.h> |
29 | #include <asm/syscalls.h> |
30 | |
31 | void show_regs(struct pt_regs * regs) |
32 | { |
33 | printk("\n"); |
34 | printk("Pid : %d, Comm: \t\t%s\n", task_pid_nr(current), current->comm); |
35 | printk("CPU : %d \t\t%s (%s %.*s)\n\n", |
36 | smp_processor_id(), print_tainted(), init_utsname()->release, |
37 | (int)strcspn(init_utsname()->version, " "), |
38 | init_utsname()->version); |
39 | |
40 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
41 | print_symbol("PR is at %s\n", regs->pr); |
42 | |
43 | printk("PC : %08lx SP : %08lx SR : %08lx ", |
44 | regs->pc, regs->regs[15], regs->sr); |
45 | #ifdef CONFIG_MMU |
46 | printk("TEA : %08x\n", __raw_readl(MMU_TEA)); |
47 | #else |
48 | printk("\n"); |
49 | #endif |
50 | |
51 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", |
52 | regs->regs[0],regs->regs[1], |
53 | regs->regs[2],regs->regs[3]); |
54 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", |
55 | regs->regs[4],regs->regs[5], |
56 | regs->regs[6],regs->regs[7]); |
57 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", |
58 | regs->regs[8],regs->regs[9], |
59 | regs->regs[10],regs->regs[11]); |
60 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", |
61 | regs->regs[12],regs->regs[13], |
62 | regs->regs[14]); |
63 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", |
64 | regs->mach, regs->macl, regs->gbr, regs->pr); |
65 | |
66 | show_trace(NULL, (unsigned long *)regs->regs[15], regs); |
67 | show_code(regs); |
68 | } |
69 | |
70 | /* |
71 | * Create a kernel thread |
72 | */ |
73 | __noreturn void kernel_thread_helper(void *arg, int (*fn)(void *)) |
74 | { |
75 | do_exit(fn(arg)); |
76 | } |
77 | |
78 | /* Don't use this in BL=1(cli). Or else, CPU resets! */ |
79 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
80 | { |
81 | struct pt_regs regs; |
82 | int pid; |
83 | |
84 | memset(®s, 0, sizeof(regs)); |
85 | regs.regs[4] = (unsigned long)arg; |
86 | regs.regs[5] = (unsigned long)fn; |
87 | |
88 | regs.pc = (unsigned long)kernel_thread_helper; |
89 | regs.sr = SR_MD; |
90 | #if defined(CONFIG_SH_FPU) |
91 | regs.sr |= SR_FD; |
92 | #endif |
93 | |
94 | /* Ok, create the new process.. */ |
95 | pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
96 | ®s, 0, NULL, NULL); |
97 | |
98 | return pid; |
99 | } |
100 | EXPORT_SYMBOL(kernel_thread); |
101 | |
102 | void start_thread(struct pt_regs *regs, unsigned long new_pc, |
103 | unsigned long new_sp) |
104 | { |
105 | regs->pr = 0; |
106 | regs->sr = SR_FD; |
107 | regs->pc = new_pc; |
108 | regs->regs[15] = new_sp; |
109 | |
110 | free_thread_xstate(current); |
111 | } |
112 | EXPORT_SYMBOL(start_thread); |
113 | |
114 | /* |
115 | * Free current thread data structures etc.. |
116 | */ |
117 | void exit_thread(void) |
118 | { |
119 | } |
120 | |
121 | void flush_thread(void) |
122 | { |
123 | struct task_struct *tsk = current; |
124 | |
125 | flush_ptrace_hw_breakpoint(tsk); |
126 | |
127 | #if defined(CONFIG_SH_FPU) |
128 | /* Forget lazy FPU state */ |
129 | clear_fpu(tsk, task_pt_regs(tsk)); |
130 | clear_used_math(); |
131 | #endif |
132 | } |
133 | |
134 | void release_thread(struct task_struct *dead_task) |
135 | { |
136 | /* do nothing */ |
137 | } |
138 | |
139 | /* Fill in the fpu structure for a core dump.. */ |
140 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) |
141 | { |
142 | int fpvalid = 0; |
143 | |
144 | #if defined(CONFIG_SH_FPU) |
145 | struct task_struct *tsk = current; |
146 | |
147 | fpvalid = !!tsk_used_math(tsk); |
148 | if (fpvalid) |
149 | fpvalid = !fpregs_get(tsk, NULL, 0, |
150 | sizeof(struct user_fpu_struct), |
151 | fpu, NULL); |
152 | #endif |
153 | |
154 | return fpvalid; |
155 | } |
156 | EXPORT_SYMBOL(dump_fpu); |
157 | |
158 | /* |
159 | * This gets called before we allocate a new thread and copy |
160 | * the current task into it. |
161 | */ |
162 | void prepare_to_copy(struct task_struct *tsk) |
163 | { |
164 | unlazy_fpu(tsk, task_pt_regs(tsk)); |
165 | } |
166 | |
167 | asmlinkage void ret_from_fork(void); |
168 | |
169 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
170 | unsigned long unused, |
171 | struct task_struct *p, struct pt_regs *regs) |
172 | { |
173 | struct thread_info *ti = task_thread_info(p); |
174 | struct pt_regs *childregs; |
175 | |
176 | #if defined(CONFIG_SH_DSP) |
177 | struct task_struct *tsk = current; |
178 | |
179 | if (is_dsp_enabled(tsk)) { |
180 | /* We can use the __save_dsp or just copy the struct: |
181 | * __save_dsp(p); |
182 | * p->thread.dsp_status.status |= SR_DSP |
183 | */ |
184 | p->thread.dsp_status = tsk->thread.dsp_status; |
185 | } |
186 | #endif |
187 | |
188 | childregs = task_pt_regs(p); |
189 | *childregs = *regs; |
190 | |
191 | if (user_mode(regs)) { |
192 | childregs->regs[15] = usp; |
193 | ti->addr_limit = USER_DS; |
194 | } else { |
195 | childregs->regs[15] = (unsigned long)childregs; |
196 | ti->addr_limit = KERNEL_DS; |
197 | ti->status &= ~TS_USEDFPU; |
198 | p->fpu_counter = 0; |
199 | } |
200 | |
201 | if (clone_flags & CLONE_SETTLS) |
202 | childregs->gbr = childregs->regs[0]; |
203 | |
204 | childregs->regs[0] = 0; /* Set return value for child */ |
205 | |
206 | p->thread.sp = (unsigned long) childregs; |
207 | p->thread.pc = (unsigned long) ret_from_fork; |
208 | |
209 | memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps)); |
210 | |
211 | return 0; |
212 | } |
213 | |
214 | /* |
215 | * switch_to(x,y) should switch tasks from x to y. |
216 | * |
217 | */ |
218 | __notrace_funcgraph struct task_struct * |
219 | __switch_to(struct task_struct *prev, struct task_struct *next) |
220 | { |
221 | struct thread_struct *next_t = &next->thread; |
222 | |
223 | unlazy_fpu(prev, task_pt_regs(prev)); |
224 | |
225 | /* we're going to use this soon, after a few expensive things */ |
226 | if (next->fpu_counter > 5) |
227 | prefetch(next_t->xstate); |
228 | |
229 | #ifdef CONFIG_MMU |
230 | /* |
231 | * Restore the kernel mode register |
232 | * k7 (r7_bank1) |
233 | */ |
234 | asm volatile("ldc %0, r7_bank" |
235 | : /* no output */ |
236 | : "r" (task_thread_info(next))); |
237 | #endif |
238 | |
239 | /* |
240 | * If the task has used fpu the last 5 timeslices, just do a full |
241 | * restore of the math state immediately to avoid the trap; the |
242 | * chances of needing FPU soon are obviously high now |
243 | */ |
244 | if (next->fpu_counter > 5) |
245 | __fpu_state_restore(); |
246 | |
247 | return prev; |
248 | } |
249 | |
250 | asmlinkage int sys_fork(unsigned long r4, unsigned long r5, |
251 | unsigned long r6, unsigned long r7, |
252 | struct pt_regs __regs) |
253 | { |
254 | #ifdef CONFIG_MMU |
255 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
256 | return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL); |
257 | #else |
258 | /* fork almost works, enough to trick you into looking elsewhere :-( */ |
259 | return -EINVAL; |
260 | #endif |
261 | } |
262 | |
263 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, |
264 | unsigned long parent_tidptr, |
265 | unsigned long child_tidptr, |
266 | struct pt_regs __regs) |
267 | { |
268 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
269 | if (!newsp) |
270 | newsp = regs->regs[15]; |
271 | return do_fork(clone_flags, newsp, regs, 0, |
272 | (int __user *)parent_tidptr, |
273 | (int __user *)child_tidptr); |
274 | } |
275 | |
276 | /* |
277 | * This is trivial, and on the face of it looks like it |
278 | * could equally well be done in user mode. |
279 | * |
280 | * Not so, for quite unobvious reasons - register pressure. |
281 | * In user mode vfork() cannot have a stack frame, and if |
282 | * done by calling the "clone()" system call directly, you |
283 | * do not have enough call-clobbered registers to hold all |
284 | * the information you need. |
285 | */ |
286 | asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, |
287 | unsigned long r6, unsigned long r7, |
288 | struct pt_regs __regs) |
289 | { |
290 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
291 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs, |
292 | 0, NULL, NULL); |
293 | } |
294 | |
295 | /* |
296 | * sys_execve() executes a new program. |
297 | */ |
298 | asmlinkage int sys_execve(const char __user *ufilename, |
299 | const char __user *const __user *uargv, |
300 | const char __user *const __user *uenvp, |
301 | unsigned long r7, struct pt_regs __regs) |
302 | { |
303 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
304 | int error; |
305 | char *filename; |
306 | |
307 | filename = getname(ufilename); |
308 | error = PTR_ERR(filename); |
309 | if (IS_ERR(filename)) |
310 | goto out; |
311 | |
312 | error = do_execve(filename, uargv, uenvp, regs); |
313 | putname(filename); |
314 | out: |
315 | return error; |
316 | } |
317 | |
318 | unsigned long get_wchan(struct task_struct *p) |
319 | { |
320 | unsigned long pc; |
321 | |
322 | if (!p || p == current || p->state == TASK_RUNNING) |
323 | return 0; |
324 | |
325 | /* |
326 | * The same comment as on the Alpha applies here, too ... |
327 | */ |
328 | pc = thread_saved_pc(p); |
329 | |
330 | #ifdef CONFIG_FRAME_POINTER |
331 | if (in_sched_functions(pc)) { |
332 | unsigned long schedule_frame = (unsigned long)p->thread.sp; |
333 | return ((unsigned long *)schedule_frame)[21]; |
334 | } |
335 | #endif |
336 | |
337 | return pc; |
338 | } |
339 |
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