Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/process.c | |
3 | * | |
4 | * Copyright (C) 1996-2000 Russell King - Converted to ARM. | |
5 | * Original Copyright (C) 1995 Linus Torvalds | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <stdarg.h> | |
12 | ||
ecea4ab6 | 13 | #include <linux/export.h> |
1da177e4 LT |
14 | #include <linux/sched.h> |
15 | #include <linux/kernel.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/stddef.h> | |
18 | #include <linux/unistd.h> | |
1da177e4 | 19 | #include <linux/user.h> |
1da177e4 LT |
20 | #include <linux/interrupt.h> |
21 | #include <linux/kallsyms.h> | |
22 | #include <linux/init.h> | |
84dff1a7 | 23 | #include <linux/elfcore.h> |
74617fb6 | 24 | #include <linux/pm.h> |
9e4559dd | 25 | #include <linux/tick.h> |
154c772e | 26 | #include <linux/utsname.h> |
33fa9b13 | 27 | #include <linux/uaccess.h> |
990cb8ac | 28 | #include <linux/random.h> |
864232fa | 29 | #include <linux/hw_breakpoint.h> |
fa8bbb13 | 30 | #include <linux/leds.h> |
1da177e4 | 31 | |
1da177e4 | 32 | #include <asm/processor.h> |
d6551e88 | 33 | #include <asm/thread_notify.h> |
2d7c11bf | 34 | #include <asm/stacktrace.h> |
779dd959 | 35 | #include <asm/system_misc.h> |
2ea83398 | 36 | #include <asm/mach/time.h> |
a4780ade | 37 | #include <asm/tls.h> |
045ab94e | 38 | #include <asm/vdso.h> |
1da177e4 | 39 | |
c743f380 NP |
40 | #ifdef CONFIG_CC_STACKPROTECTOR |
41 | #include <linux/stackprotector.h> | |
42 | unsigned long __stack_chk_guard __read_mostly; | |
43 | EXPORT_SYMBOL(__stack_chk_guard); | |
44 | #endif | |
45 | ||
e2e55fde | 46 | static const char *processor_modes[] __maybe_unused = { |
ae0a846e RK |
47 | "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , |
48 | "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", | |
f3a04202 SB |
49 | "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "MON_32" , "ABT_32" , |
50 | "UK8_32" , "UK9_32" , "HYP_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32" | |
ae0a846e RK |
51 | }; |
52 | ||
e2e55fde | 53 | static const char *isa_modes[] __maybe_unused = { |
909d6c6c GD |
54 | "ARM" , "Thumb" , "Jazelle", "ThumbEE" |
55 | }; | |
56 | ||
1da177e4 | 57 | /* |
4fa20439 | 58 | * This is our default idle handler. |
1da177e4 | 59 | */ |
4fa20439 NP |
60 | |
61 | void (*arm_pm_idle)(void); | |
62 | ||
ad68cc7a NP |
63 | /* |
64 | * Called from the core idle loop. | |
65 | */ | |
66 | ||
67 | void arch_cpu_idle(void) | |
1da177e4 | 68 | { |
4fa20439 NP |
69 | if (arm_pm_idle) |
70 | arm_pm_idle(); | |
71 | else | |
ae940913 | 72 | cpu_do_idle(); |
9ccdac36 | 73 | local_irq_enable(); |
1da177e4 LT |
74 | } |
75 | ||
f7b861b7 | 76 | void arch_cpu_idle_prepare(void) |
1da177e4 LT |
77 | { |
78 | local_fiq_enable(); | |
f7b861b7 | 79 | } |
1da177e4 | 80 | |
f7b861b7 TG |
81 | void arch_cpu_idle_enter(void) |
82 | { | |
83 | ledtrig_cpu(CPU_LED_IDLE_START); | |
84 | #ifdef CONFIG_PL310_ERRATA_769419 | |
85 | wmb(); | |
a054a811 | 86 | #endif |
f7b861b7 | 87 | } |
a054a811 | 88 | |
f7b861b7 TG |
89 | void arch_cpu_idle_exit(void) |
90 | { | |
91 | ledtrig_cpu(CPU_LED_IDLE_END); | |
92 | } | |
93 | ||
652a12ef | 94 | void __show_regs(struct pt_regs *regs) |
1da177e4 | 95 | { |
154c772e RK |
96 | unsigned long flags; |
97 | char buf[64]; | |
77f1b959 RK |
98 | #ifndef CONFIG_CPU_V7M |
99 | unsigned int domain; | |
100 | #ifdef CONFIG_CPU_SW_DOMAIN_PAN | |
101 | /* | |
102 | * Get the domain register for the parent context. In user | |
103 | * mode, we don't save the DACR, so lets use what it should | |
104 | * be. For other modes, we place it after the pt_regs struct. | |
105 | */ | |
106 | if (user_mode(regs)) | |
107 | domain = DACR_UACCESS_ENABLE; | |
108 | else | |
109 | domain = *(unsigned int *)(regs + 1); | |
110 | #else | |
111 | domain = get_domain(); | |
112 | #endif | |
113 | #endif | |
1da177e4 | 114 | |
a43cb95d TH |
115 | show_regs_print_info(KERN_DEFAULT); |
116 | ||
1da177e4 LT |
117 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
118 | print_symbol("LR is at %s\n", regs->ARM_lr); | |
154c772e | 119 | printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n" |
1da177e4 | 120 | "sp : %08lx ip : %08lx fp : %08lx\n", |
154c772e RK |
121 | regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr, |
122 | regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); | |
1da177e4 LT |
123 | printk("r10: %08lx r9 : %08lx r8 : %08lx\n", |
124 | regs->ARM_r10, regs->ARM_r9, | |
125 | regs->ARM_r8); | |
126 | printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", | |
127 | regs->ARM_r7, regs->ARM_r6, | |
128 | regs->ARM_r5, regs->ARM_r4); | |
129 | printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", | |
130 | regs->ARM_r3, regs->ARM_r2, | |
131 | regs->ARM_r1, regs->ARM_r0); | |
154c772e RK |
132 | |
133 | flags = regs->ARM_cpsr; | |
134 | buf[0] = flags & PSR_N_BIT ? 'N' : 'n'; | |
135 | buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z'; | |
136 | buf[2] = flags & PSR_C_BIT ? 'C' : 'c'; | |
137 | buf[3] = flags & PSR_V_BIT ? 'V' : 'v'; | |
138 | buf[4] = '\0'; | |
139 | ||
e2e55fde | 140 | #ifndef CONFIG_CPU_V7M |
a5e090ac | 141 | { |
a5e090ac RK |
142 | const char *segment; |
143 | ||
a5e090ac RK |
144 | if ((domain & domain_mask(DOMAIN_USER)) == |
145 | domain_val(DOMAIN_USER, DOMAIN_NOACCESS)) | |
146 | segment = "none"; | |
147 | else if (get_fs() == get_ds()) | |
148 | segment = "kernel"; | |
149 | else | |
150 | segment = "user"; | |
151 | ||
152 | printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n", | |
153 | buf, interrupts_enabled(regs) ? "n" : "ff", | |
154 | fast_interrupts_enabled(regs) ? "n" : "ff", | |
155 | processor_modes[processor_mode(regs)], | |
156 | isa_modes[isa_mode(regs)], segment); | |
157 | } | |
e2e55fde UKK |
158 | #else |
159 | printk("xPSR: %08lx\n", regs->ARM_cpsr); | |
160 | #endif | |
161 | ||
154c772e | 162 | #ifdef CONFIG_CPU_CP15 |
1da177e4 | 163 | { |
f12d0d7c | 164 | unsigned int ctrl; |
154c772e RK |
165 | |
166 | buf[0] = '\0'; | |
f12d0d7c | 167 | #ifdef CONFIG_CPU_CP15_MMU |
154c772e | 168 | { |
77f1b959 | 169 | unsigned int transbase; |
154c772e | 170 | asm("mrc p15, 0, %0, c2, c0\n\t" |
1eef5d2f | 171 | : "=r" (transbase)); |
154c772e | 172 | snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x", |
77f1b959 | 173 | transbase, domain); |
154c772e | 174 | } |
f12d0d7c | 175 | #endif |
154c772e RK |
176 | asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl)); |
177 | ||
178 | printk("Control: %08x%s\n", ctrl, buf); | |
179 | } | |
f12d0d7c | 180 | #endif |
1da177e4 LT |
181 | } |
182 | ||
652a12ef RK |
183 | void show_regs(struct pt_regs * regs) |
184 | { | |
652a12ef | 185 | __show_regs(regs); |
b380ab4f | 186 | dump_stack(); |
652a12ef RK |
187 | } |
188 | ||
797245f5 RK |
189 | ATOMIC_NOTIFIER_HEAD(thread_notify_head); |
190 | ||
191 | EXPORT_SYMBOL_GPL(thread_notify_head); | |
192 | ||
1da177e4 LT |
193 | /* |
194 | * Free current thread data structures etc.. | |
195 | */ | |
196 | void exit_thread(void) | |
197 | { | |
797245f5 | 198 | thread_notify(THREAD_NOTIFY_EXIT, current_thread_info()); |
1da177e4 LT |
199 | } |
200 | ||
1da177e4 LT |
201 | void flush_thread(void) |
202 | { | |
203 | struct thread_info *thread = current_thread_info(); | |
204 | struct task_struct *tsk = current; | |
205 | ||
864232fa WD |
206 | flush_ptrace_hw_breakpoint(tsk); |
207 | ||
1da177e4 LT |
208 | memset(thread->used_cp, 0, sizeof(thread->used_cp)); |
209 | memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); | |
d6551e88 RK |
210 | memset(&thread->fpstate, 0, sizeof(union fp_state)); |
211 | ||
fbfb872f NL |
212 | flush_tls(); |
213 | ||
d6551e88 | 214 | thread_notify(THREAD_NOTIFY_FLUSH, thread); |
1da177e4 LT |
215 | } |
216 | ||
217 | void release_thread(struct task_struct *dead_task) | |
218 | { | |
1da177e4 LT |
219 | } |
220 | ||
221 | asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); | |
222 | ||
223 | int | |
6f2c55b8 | 224 | copy_thread(unsigned long clone_flags, unsigned long stack_start, |
afa86fc4 | 225 | unsigned long stk_sz, struct task_struct *p) |
1da177e4 | 226 | { |
815d5ec8 AV |
227 | struct thread_info *thread = task_thread_info(p); |
228 | struct pt_regs *childregs = task_pt_regs(p); | |
1da177e4 | 229 | |
1da177e4 | 230 | memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save)); |
9e14f828 | 231 | |
af4cb25d | 232 | #ifdef CONFIG_CPU_USE_DOMAINS |
1eef5d2f RK |
233 | /* |
234 | * Copy the initial value of the domain access control register | |
235 | * from the current thread: thread->addr_limit will have been | |
236 | * copied from the current thread via setup_thread_stack() in | |
237 | * kernel/fork.c | |
238 | */ | |
239 | thread->cpu_domain = get_domain(); | |
af4cb25d | 240 | #endif |
1eef5d2f | 241 | |
38a61b6b AV |
242 | if (likely(!(p->flags & PF_KTHREAD))) { |
243 | *childregs = *current_pt_regs(); | |
9e14f828 | 244 | childregs->ARM_r0 = 0; |
38a61b6b AV |
245 | if (stack_start) |
246 | childregs->ARM_sp = stack_start; | |
9e14f828 | 247 | } else { |
9fff2fa0 | 248 | memset(childregs, 0, sizeof(struct pt_regs)); |
9e14f828 AV |
249 | thread->cpu_context.r4 = stk_sz; |
250 | thread->cpu_context.r5 = stack_start; | |
9e14f828 AV |
251 | childregs->ARM_cpsr = SVC_MODE; |
252 | } | |
9fff2fa0 | 253 | thread->cpu_context.pc = (unsigned long)ret_from_fork; |
1da177e4 | 254 | thread->cpu_context.sp = (unsigned long)childregs; |
1da177e4 | 255 | |
864232fa WD |
256 | clear_ptrace_hw_breakpoint(p); |
257 | ||
1da177e4 | 258 | if (clone_flags & CLONE_SETTLS) |
a4780ade AH |
259 | thread->tp_value[0] = childregs->ARM_r3; |
260 | thread->tp_value[1] = get_tpuser(); | |
1da177e4 | 261 | |
2e82669a CM |
262 | thread_notify(THREAD_NOTIFY_COPY, thread); |
263 | ||
1da177e4 LT |
264 | return 0; |
265 | } | |
266 | ||
cde3f860 AB |
267 | /* |
268 | * Fill in the task's elfregs structure for a core dump. | |
269 | */ | |
270 | int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs) | |
271 | { | |
272 | elf_core_copy_regs(elfregs, task_pt_regs(t)); | |
273 | return 1; | |
274 | } | |
275 | ||
1da177e4 LT |
276 | /* |
277 | * fill in the fpe structure for a core dump... | |
278 | */ | |
279 | int dump_fpu (struct pt_regs *regs, struct user_fp *fp) | |
280 | { | |
281 | struct thread_info *thread = current_thread_info(); | |
282 | int used_math = thread->used_cp[1] | thread->used_cp[2]; | |
283 | ||
284 | if (used_math) | |
285 | memcpy(fp, &thread->fpstate.soft, sizeof (*fp)); | |
286 | ||
287 | return used_math != 0; | |
288 | } | |
289 | EXPORT_SYMBOL(dump_fpu); | |
290 | ||
1da177e4 LT |
291 | unsigned long get_wchan(struct task_struct *p) |
292 | { | |
2d7c11bf | 293 | struct stackframe frame; |
1b15ec7a | 294 | unsigned long stack_page; |
1da177e4 LT |
295 | int count = 0; |
296 | if (!p || p == current || p->state == TASK_RUNNING) | |
297 | return 0; | |
298 | ||
2d7c11bf CM |
299 | frame.fp = thread_saved_fp(p); |
300 | frame.sp = thread_saved_sp(p); | |
301 | frame.lr = 0; /* recovered from the stack */ | |
302 | frame.pc = thread_saved_pc(p); | |
1b15ec7a | 303 | stack_page = (unsigned long)task_stack_page(p); |
1da177e4 | 304 | do { |
1b15ec7a KK |
305 | if (frame.sp < stack_page || |
306 | frame.sp >= stack_page + THREAD_SIZE || | |
307 | unwind_frame(&frame) < 0) | |
1da177e4 | 308 | return 0; |
2d7c11bf CM |
309 | if (!in_sched_functions(frame.pc)) |
310 | return frame.pc; | |
1da177e4 LT |
311 | } while (count ++ < 16); |
312 | return 0; | |
313 | } | |
990cb8ac NP |
314 | |
315 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
316 | { | |
317 | unsigned long range_end = mm->brk + 0x02000000; | |
318 | return randomize_range(mm->brk, range_end, 0) ? : mm->brk; | |
319 | } | |
ec706dab | 320 | |
6cde6d42 | 321 | #ifdef CONFIG_MMU |
a5463cd3 | 322 | #ifdef CONFIG_KUSER_HELPERS |
ec706dab NP |
323 | /* |
324 | * The vectors page is always readable from user space for the | |
48be69a0 RK |
325 | * atomic helpers. Insert it into the gate_vma so that it is visible |
326 | * through ptrace and /proc/<pid>/mem. | |
ec706dab | 327 | */ |
f6604efe RK |
328 | static struct vm_area_struct gate_vma = { |
329 | .vm_start = 0xffff0000, | |
330 | .vm_end = 0xffff0000 + PAGE_SIZE, | |
331 | .vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYEXEC, | |
f6604efe | 332 | }; |
ec706dab | 333 | |
f9d4861f | 334 | static int __init gate_vma_init(void) |
ec706dab | 335 | { |
f6604efe | 336 | gate_vma.vm_page_prot = PAGE_READONLY_EXEC; |
f9d4861f WD |
337 | return 0; |
338 | } | |
339 | arch_initcall(gate_vma_init); | |
340 | ||
341 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) | |
342 | { | |
343 | return &gate_vma; | |
344 | } | |
345 | ||
346 | int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
347 | { | |
348 | return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end); | |
349 | } | |
350 | ||
351 | int in_gate_area_no_mm(unsigned long addr) | |
352 | { | |
353 | return in_gate_area(NULL, addr); | |
ec706dab | 354 | } |
1d0bbf42 | 355 | #define is_gate_vma(vma) ((vma) == &gate_vma) |
a5463cd3 RK |
356 | #else |
357 | #define is_gate_vma(vma) 0 | |
358 | #endif | |
ec706dab NP |
359 | |
360 | const char *arch_vma_name(struct vm_area_struct *vma) | |
361 | { | |
02e0409a | 362 | return is_gate_vma(vma) ? "[vectors]" : NULL; |
48be69a0 RK |
363 | } |
364 | ||
389522b0 | 365 | /* If possible, provide a placement hint at a random offset from the |
ecf99a43 | 366 | * stack for the sigpage and vdso pages. |
389522b0 NL |
367 | */ |
368 | static unsigned long sigpage_addr(const struct mm_struct *mm, | |
369 | unsigned int npages) | |
370 | { | |
371 | unsigned long offset; | |
372 | unsigned long first; | |
373 | unsigned long last; | |
374 | unsigned long addr; | |
375 | unsigned int slots; | |
376 | ||
377 | first = PAGE_ALIGN(mm->start_stack); | |
378 | ||
379 | last = TASK_SIZE - (npages << PAGE_SHIFT); | |
380 | ||
381 | /* No room after stack? */ | |
382 | if (first > last) | |
383 | return 0; | |
384 | ||
385 | /* Just enough room? */ | |
386 | if (first == last) | |
387 | return first; | |
388 | ||
389 | slots = ((last - first) >> PAGE_SHIFT) + 1; | |
390 | ||
391 | offset = get_random_int() % slots; | |
392 | ||
393 | addr = first + (offset << PAGE_SHIFT); | |
394 | ||
395 | return addr; | |
48be69a0 RK |
396 | } |
397 | ||
e0d40756 | 398 | static struct page *signal_page; |
48be69a0 RK |
399 | extern struct page *get_signal_page(void); |
400 | ||
02e0409a NL |
401 | static const struct vm_special_mapping sigpage_mapping = { |
402 | .name = "[sigpage]", | |
403 | .pages = &signal_page, | |
404 | }; | |
405 | ||
48be69a0 RK |
406 | int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) |
407 | { | |
408 | struct mm_struct *mm = current->mm; | |
02e0409a | 409 | struct vm_area_struct *vma; |
ecf99a43 | 410 | unsigned long npages; |
48be69a0 | 411 | unsigned long addr; |
389522b0 | 412 | unsigned long hint; |
02e0409a | 413 | int ret = 0; |
48be69a0 | 414 | |
e0d40756 RK |
415 | if (!signal_page) |
416 | signal_page = get_signal_page(); | |
417 | if (!signal_page) | |
48be69a0 RK |
418 | return -ENOMEM; |
419 | ||
ecf99a43 NL |
420 | npages = 1; /* for sigpage */ |
421 | npages += vdso_total_pages; | |
422 | ||
48be69a0 | 423 | down_write(&mm->mmap_sem); |
ecf99a43 NL |
424 | hint = sigpage_addr(mm, npages); |
425 | addr = get_unmapped_area(NULL, hint, npages << PAGE_SHIFT, 0, 0); | |
48be69a0 RK |
426 | if (IS_ERR_VALUE(addr)) { |
427 | ret = addr; | |
428 | goto up_fail; | |
429 | } | |
430 | ||
02e0409a | 431 | vma = _install_special_mapping(mm, addr, PAGE_SIZE, |
48be69a0 | 432 | VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, |
02e0409a NL |
433 | &sigpage_mapping); |
434 | ||
435 | if (IS_ERR(vma)) { | |
436 | ret = PTR_ERR(vma); | |
437 | goto up_fail; | |
438 | } | |
48be69a0 | 439 | |
02e0409a | 440 | mm->context.sigpage = addr; |
48be69a0 | 441 | |
ecf99a43 NL |
442 | /* Unlike the sigpage, failure to install the vdso is unlikely |
443 | * to be fatal to the process, so no error check needed | |
444 | * here. | |
445 | */ | |
446 | arm_install_vdso(mm, addr + PAGE_SIZE); | |
447 | ||
48be69a0 RK |
448 | up_fail: |
449 | up_write(&mm->mmap_sem); | |
450 | return ret; | |
ec706dab | 451 | } |
6cde6d42 | 452 | #endif |