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Commit | Line | Data |
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aec5e0e1 PM |
1 | /* |
2 | * arch/sh/kernel/process.c | |
1da177e4 | 3 | * |
aec5e0e1 | 4 | * This file handles the architecture-dependent parts of process handling.. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1995 Linus Torvalds | |
7 | * | |
8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
8ae91b9a | 9 | * Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC |
e7ab3cd2 PM |
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. | |
1da177e4 | 15 | */ |
1da177e4 | 16 | #include <linux/module.h> |
1da177e4 | 17 | #include <linux/mm.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 | 19 | #include <linux/elfcore.h> |
1da177e4 | 20 | #include <linux/kallsyms.h> |
e06c4e57 | 21 | #include <linux/fs.h> |
7816fecd | 22 | #include <linux/ftrace.h> |
09a07294 | 23 | #include <linux/hw_breakpoint.h> |
0f0ebd98 | 24 | #include <linux/prefetch.h> |
5d920bb9 | 25 | #include <linux/stackprotector.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/mmu_context.h> | |
9bbafce2 | 28 | #include <asm/fpu.h> |
fa43972f | 29 | #include <asm/syscalls.h> |
f03c4866 | 30 | #include <asm/switch_to.h> |
1da177e4 | 31 | |
1da177e4 LT |
32 | void show_regs(struct pt_regs * regs) |
33 | { | |
34 | printk("\n"); | |
75fd24c1 PM |
35 | printk("Pid : %d, Comm: \t\t%s\n", task_pid_nr(current), current->comm); |
36 | printk("CPU : %d \t\t%s (%s %.*s)\n\n", | |
7d96169c PM |
37 | smp_processor_id(), print_tainted(), init_utsname()->release, |
38 | (int)strcspn(init_utsname()->version, " "), | |
39 | init_utsname()->version); | |
40 | ||
6b002230 | 41 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
7d96169c PM |
42 | print_symbol("PR is at %s\n", regs->pr); |
43 | ||
1da177e4 LT |
44 | printk("PC : %08lx SP : %08lx SR : %08lx ", |
45 | regs->pc, regs->regs[15], regs->sr); | |
46 | #ifdef CONFIG_MMU | |
9d56dd3b | 47 | printk("TEA : %08x\n", __raw_readl(MMU_TEA)); |
1da177e4 | 48 | #else |
7d96169c | 49 | printk("\n"); |
1da177e4 | 50 | #endif |
1da177e4 LT |
51 | |
52 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
53 | regs->regs[0],regs->regs[1], | |
54 | regs->regs[2],regs->regs[3]); | |
55 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", | |
56 | regs->regs[4],regs->regs[5], | |
57 | regs->regs[6],regs->regs[7]); | |
58 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", | |
59 | regs->regs[8],regs->regs[9], | |
60 | regs->regs[10],regs->regs[11]); | |
61 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", | |
62 | regs->regs[12],regs->regs[13], | |
63 | regs->regs[14]); | |
64 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", | |
65 | regs->mach, regs->macl, regs->gbr, regs->pr); | |
66 | ||
6b002230 | 67 | show_trace(NULL, (unsigned long *)regs->regs[15], regs); |
9cfc9a9b | 68 | show_code(regs); |
1da177e4 LT |
69 | } |
70 | ||
71 | /* | |
72 | * Create a kernel thread | |
73 | */ | |
ff2d8b19 | 74 | __noreturn void kernel_thread_helper(void *arg, int (*fn)(void *)) |
43f8f9b9 PM |
75 | { |
76 | do_exit(fn(arg)); | |
77 | } | |
1da177e4 | 78 | |
aec5e0e1 | 79 | /* Don't use this in BL=1(cli). Or else, CPU resets! */ |
1da177e4 | 80 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
aec5e0e1 | 81 | { |
1da177e4 | 82 | struct pt_regs regs; |
3d58695e | 83 | int pid; |
1da177e4 LT |
84 | |
85 | memset(®s, 0, sizeof(regs)); | |
aec5e0e1 PM |
86 | regs.regs[4] = (unsigned long)arg; |
87 | regs.regs[5] = (unsigned long)fn; | |
1da177e4 | 88 | |
aec5e0e1 | 89 | regs.pc = (unsigned long)kernel_thread_helper; |
d3ea9fa0 SM |
90 | regs.sr = SR_MD; |
91 | #if defined(CONFIG_SH_FPU) | |
92 | regs.sr |= SR_FD; | |
93 | #endif | |
1da177e4 LT |
94 | |
95 | /* Ok, create the new process.. */ | |
3d58695e PM |
96 | pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
97 | ®s, 0, NULL, NULL); | |
98 | ||
3d58695e | 99 | return pid; |
1da177e4 | 100 | } |
4c978ca3 | 101 | EXPORT_SYMBOL(kernel_thread); |
1da177e4 | 102 | |
70e068ee PM |
103 | void start_thread(struct pt_regs *regs, unsigned long new_pc, |
104 | unsigned long new_sp) | |
105 | { | |
70e068ee PM |
106 | regs->pr = 0; |
107 | regs->sr = SR_FD; | |
108 | regs->pc = new_pc; | |
109 | regs->regs[15] = new_sp; | |
0ea820cf PM |
110 | |
111 | free_thread_xstate(current); | |
70e068ee PM |
112 | } |
113 | EXPORT_SYMBOL(start_thread); | |
114 | ||
1da177e4 LT |
115 | /* |
116 | * Free current thread data structures etc.. | |
117 | */ | |
118 | void exit_thread(void) | |
119 | { | |
1da177e4 LT |
120 | } |
121 | ||
122 | void flush_thread(void) | |
123 | { | |
1da177e4 | 124 | struct task_struct *tsk = current; |
09a07294 PM |
125 | |
126 | flush_ptrace_hw_breakpoint(tsk); | |
127 | ||
128 | #if defined(CONFIG_SH_FPU) | |
1da177e4 | 129 | /* Forget lazy FPU state */ |
3cf0f4ec | 130 | clear_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
131 | clear_used_math(); |
132 | #endif | |
133 | } | |
134 | ||
135 | void release_thread(struct task_struct *dead_task) | |
136 | { | |
137 | /* do nothing */ | |
138 | } | |
139 | ||
140 | /* Fill in the fpu structure for a core dump.. */ | |
141 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
142 | { | |
143 | int fpvalid = 0; | |
144 | ||
145 | #if defined(CONFIG_SH_FPU) | |
146 | struct task_struct *tsk = current; | |
147 | ||
148 | fpvalid = !!tsk_used_math(tsk); | |
e7ab3cd2 PM |
149 | if (fpvalid) |
150 | fpvalid = !fpregs_get(tsk, NULL, 0, | |
151 | sizeof(struct user_fpu_struct), | |
152 | fpu, NULL); | |
1da177e4 LT |
153 | #endif |
154 | ||
155 | return fpvalid; | |
156 | } | |
4c978ca3 | 157 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 LT |
158 | |
159 | asmlinkage void ret_from_fork(void); | |
160 | ||
6f2c55b8 | 161 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
1da177e4 LT |
162 | unsigned long unused, |
163 | struct task_struct *p, struct pt_regs *regs) | |
164 | { | |
2991be72 | 165 | struct thread_info *ti = task_thread_info(p); |
1da177e4 | 166 | struct pt_regs *childregs; |
1da177e4 | 167 | |
d3ea9fa0 | 168 | #if defined(CONFIG_SH_DSP) |
1da177e4 LT |
169 | struct task_struct *tsk = current; |
170 | ||
01ab1039 MT |
171 | if (is_dsp_enabled(tsk)) { |
172 | /* We can use the __save_dsp or just copy the struct: | |
173 | * __save_dsp(p); | |
174 | * p->thread.dsp_status.status |= SR_DSP | |
175 | */ | |
176 | p->thread.dsp_status = tsk->thread.dsp_status; | |
177 | } | |
178 | #endif | |
179 | ||
3cf0f4ec | 180 | childregs = task_pt_regs(p); |
1da177e4 LT |
181 | *childregs = *regs; |
182 | ||
183 | if (user_mode(regs)) { | |
184 | childregs->regs[15] = usp; | |
2991be72 | 185 | ti->addr_limit = USER_DS; |
1da177e4 | 186 | } else { |
e6bcf562 | 187 | childregs->regs[15] = (unsigned long)childregs; |
2991be72 | 188 | ti->addr_limit = KERNEL_DS; |
d3ea9fa0 SM |
189 | ti->status &= ~TS_USEDFPU; |
190 | p->fpu_counter = 0; | |
1da177e4 | 191 | } |
aec5e0e1 | 192 | |
e6bcf562 | 193 | if (clone_flags & CLONE_SETTLS) |
1da177e4 | 194 | childregs->gbr = childregs->regs[0]; |
aec5e0e1 | 195 | |
1da177e4 LT |
196 | childregs->regs[0] = 0; /* Set return value for child */ |
197 | ||
198 | p->thread.sp = (unsigned long) childregs; | |
199 | p->thread.pc = (unsigned long) ret_from_fork; | |
200 | ||
09a07294 | 201 | memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps)); |
1da177e4 LT |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
1da177e4 LT |
206 | /* |
207 | * switch_to(x,y) should switch tasks from x to y. | |
208 | * | |
209 | */ | |
7816fecd MF |
210 | __notrace_funcgraph struct task_struct * |
211 | __switch_to(struct task_struct *prev, struct task_struct *next) | |
1da177e4 | 212 | { |
a0458b07 GC |
213 | struct thread_struct *next_t = &next->thread; |
214 | ||
5d920bb9 FA |
215 | #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP) |
216 | __stack_chk_guard = next->stack_canary; | |
217 | #endif | |
218 | ||
3cf0f4ec | 219 | unlazy_fpu(prev, task_pt_regs(prev)); |
a0458b07 GC |
220 | |
221 | /* we're going to use this soon, after a few expensive things */ | |
222 | if (next->fpu_counter > 5) | |
0ea820cf | 223 | prefetch(next_t->xstate); |
1da177e4 | 224 | |
a2d1a5fa | 225 | #ifdef CONFIG_MMU |
1da177e4 LT |
226 | /* |
227 | * Restore the kernel mode register | |
aec5e0e1 | 228 | * k7 (r7_bank1) |
1da177e4 LT |
229 | */ |
230 | asm volatile("ldc %0, r7_bank" | |
231 | : /* no output */ | |
cafcfcaa | 232 | : "r" (task_thread_info(next))); |
a2d1a5fa | 233 | #endif |
1da177e4 | 234 | |
6ba65383 PM |
235 | /* |
236 | * If the task has used fpu the last 5 timeslices, just do a full | |
a0458b07 GC |
237 | * restore of the math state immediately to avoid the trap; the |
238 | * chances of needing FPU soon are obviously high now | |
239 | */ | |
6ba65383 | 240 | if (next->fpu_counter > 5) |
0ea820cf | 241 | __fpu_state_restore(); |
a0458b07 | 242 | |
1da177e4 LT |
243 | return prev; |
244 | } | |
245 | ||
246 | asmlinkage int sys_fork(unsigned long r4, unsigned long r5, | |
247 | unsigned long r6, unsigned long r7, | |
f0bc814c | 248 | struct pt_regs __regs) |
1da177e4 LT |
249 | { |
250 | #ifdef CONFIG_MMU | |
882c12c4 | 251 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
f0bc814c | 252 | return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL); |
1da177e4 LT |
253 | #else |
254 | /* fork almost works, enough to trick you into looking elsewhere :-( */ | |
255 | return -EINVAL; | |
256 | #endif | |
257 | } | |
258 | ||
259 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
260 | unsigned long parent_tidptr, | |
261 | unsigned long child_tidptr, | |
f0bc814c | 262 | struct pt_regs __regs) |
1da177e4 | 263 | { |
f0bc814c | 264 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 | 265 | if (!newsp) |
f0bc814c SM |
266 | newsp = regs->regs[15]; |
267 | return do_fork(clone_flags, newsp, regs, 0, | |
aec5e0e1 PM |
268 | (int __user *)parent_tidptr, |
269 | (int __user *)child_tidptr); | |
1da177e4 LT |
270 | } |
271 | ||
272 | /* | |
273 | * This is trivial, and on the face of it looks like it | |
274 | * could equally well be done in user mode. | |
275 | * | |
276 | * Not so, for quite unobvious reasons - register pressure. | |
277 | * In user mode vfork() cannot have a stack frame, and if | |
278 | * done by calling the "clone()" system call directly, you | |
279 | * do not have enough call-clobbered registers to hold all | |
280 | * the information you need. | |
281 | */ | |
282 | asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, | |
283 | unsigned long r6, unsigned long r7, | |
f0bc814c | 284 | struct pt_regs __regs) |
1da177e4 | 285 | { |
f0bc814c SM |
286 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
287 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs, | |
1da177e4 LT |
288 | 0, NULL, NULL); |
289 | } | |
290 | ||
291 | /* | |
292 | * sys_execve() executes a new program. | |
293 | */ | |
d7627467 DH |
294 | asmlinkage int sys_execve(const char __user *ufilename, |
295 | const char __user *const __user *uargv, | |
296 | const char __user *const __user *uenvp, | |
297 | unsigned long r7, struct pt_regs __regs) | |
1da177e4 | 298 | { |
f0bc814c | 299 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 | 300 | int error; |
91a27b2a | 301 | struct filename *filename; |
1da177e4 | 302 | |
e08f457c | 303 | filename = getname(ufilename); |
1da177e4 LT |
304 | error = PTR_ERR(filename); |
305 | if (IS_ERR(filename)) | |
306 | goto out; | |
307 | ||
91a27b2a | 308 | error = do_execve(filename->name, uargv, uenvp, regs); |
1da177e4 LT |
309 | putname(filename); |
310 | out: | |
311 | return error; | |
312 | } | |
313 | ||
314 | unsigned long get_wchan(struct task_struct *p) | |
315 | { | |
1da177e4 LT |
316 | unsigned long pc; |
317 | ||
318 | if (!p || p == current || p->state == TASK_RUNNING) | |
319 | return 0; | |
320 | ||
321 | /* | |
322 | * The same comment as on the Alpha applies here, too ... | |
323 | */ | |
324 | pc = thread_saved_pc(p); | |
c64ac9f0 DM |
325 | |
326 | #ifdef CONFIG_FRAME_POINTER | |
1da177e4 | 327 | if (in_sched_functions(pc)) { |
c64ac9f0 | 328 | unsigned long schedule_frame = (unsigned long)p->thread.sp; |
b652c23c | 329 | return ((unsigned long *)schedule_frame)[21]; |
1da177e4 | 330 | } |
c64ac9f0 | 331 | #endif |
b652c23c | 332 | |
1da177e4 LT |
333 | return pc; |
334 | } |