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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 |
3a2e117e | 10 | * Copyright (C) 2002 - 2007 Paul Mundt |
1da177e4 | 11 | */ |
1da177e4 | 12 | #include <linux/module.h> |
1da177e4 LT |
13 | #include <linux/mm.h> |
14 | #include <linux/elfcore.h> | |
a3310bbd | 15 | #include <linux/pm.h> |
1da177e4 | 16 | #include <linux/kallsyms.h> |
a3310bbd | 17 | #include <linux/kexec.h> |
b118ca57 | 18 | #include <linux/kdebug.h> |
57be2b48 | 19 | #include <linux/tick.h> |
e08f457c | 20 | #include <linux/reboot.h> |
1da177e4 LT |
21 | #include <asm/uaccess.h> |
22 | #include <asm/mmu_context.h> | |
5f8c9908 | 23 | #include <asm/pgalloc.h> |
bd079997 | 24 | #include <asm/system.h> |
b5233d07 | 25 | #include <asm/ubc.h> |
1da177e4 | 26 | |
aec5e0e1 | 27 | static int hlt_counter; |
1da177e4 LT |
28 | int ubc_usercnt = 0; |
29 | ||
a3310bbd | 30 | void (*pm_idle)(void); |
a3310bbd PM |
31 | void (*pm_power_off)(void); |
32 | EXPORT_SYMBOL(pm_power_off); | |
33 | ||
1da177e4 LT |
34 | void disable_hlt(void) |
35 | { | |
36 | hlt_counter++; | |
37 | } | |
1da177e4 LT |
38 | EXPORT_SYMBOL(disable_hlt); |
39 | ||
40 | void enable_hlt(void) | |
41 | { | |
42 | hlt_counter--; | |
43 | } | |
1da177e4 LT |
44 | EXPORT_SYMBOL(enable_hlt); |
45 | ||
f3a9022f PM |
46 | static int __init nohlt_setup(char *__unused) |
47 | { | |
48 | hlt_counter = 1; | |
49 | return 1; | |
50 | } | |
51 | __setup("nohlt", nohlt_setup); | |
52 | ||
53 | static int __init hlt_setup(char *__unused) | |
54 | { | |
55 | hlt_counter = 0; | |
56 | return 1; | |
57 | } | |
58 | __setup("hlt", hlt_setup); | |
59 | ||
a3310bbd PM |
60 | void default_idle(void) |
61 | { | |
f3a9022f PM |
62 | if (!hlt_counter) { |
63 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
64 | smp_mb__after_clear_bit(); | |
65 | set_bl_bit(); | |
66 | while (!need_resched()) | |
67 | cpu_sleep(); | |
68 | clear_bl_bit(); | |
69 | set_thread_flag(TIF_POLLING_NRFLAG); | |
70 | } else | |
71 | while (!need_resched()) | |
72 | cpu_relax(); | |
a3310bbd PM |
73 | } |
74 | ||
64c7c8f8 | 75 | void cpu_idle(void) |
1da177e4 | 76 | { |
f3a9022f PM |
77 | set_thread_flag(TIF_POLLING_NRFLAG); |
78 | ||
1da177e4 LT |
79 | /* endless idle loop with no priority at all */ |
80 | while (1) { | |
a3310bbd PM |
81 | void (*idle)(void) = pm_idle; |
82 | ||
83 | if (!idle) | |
84 | idle = default_idle; | |
85 | ||
57be2b48 | 86 | tick_nohz_stop_sched_tick(); |
a3310bbd PM |
87 | while (!need_resched()) |
88 | idle(); | |
57be2b48 | 89 | tick_nohz_restart_sched_tick(); |
1da177e4 | 90 | |
5bfb5d69 | 91 | preempt_enable_no_resched(); |
1da177e4 | 92 | schedule(); |
5bfb5d69 | 93 | preempt_disable(); |
5f8c9908 | 94 | check_pgt_cache(); |
1da177e4 LT |
95 | } |
96 | } | |
97 | ||
1da177e4 LT |
98 | void machine_restart(char * __unused) |
99 | { | |
100 | /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */ | |
101 | asm volatile("ldc %0, sr\n\t" | |
102 | "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001)); | |
103 | } | |
104 | ||
1da177e4 LT |
105 | void machine_halt(void) |
106 | { | |
a3310bbd | 107 | local_irq_disable(); |
1da177e4 | 108 | |
1da177e4 LT |
109 | while (1) |
110 | cpu_sleep(); | |
111 | } | |
112 | ||
1da177e4 LT |
113 | void machine_power_off(void) |
114 | { | |
a3310bbd PM |
115 | if (pm_power_off) |
116 | pm_power_off(); | |
1da177e4 LT |
117 | } |
118 | ||
1da177e4 LT |
119 | void show_regs(struct pt_regs * regs) |
120 | { | |
121 | printk("\n"); | |
122 | printk("Pid : %d, Comm: %20s\n", current->pid, current->comm); | |
6b002230 | 123 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
1da177e4 LT |
124 | printk("PC : %08lx SP : %08lx SR : %08lx ", |
125 | regs->pc, regs->regs[15], regs->sr); | |
126 | #ifdef CONFIG_MMU | |
127 | printk("TEA : %08x ", ctrl_inl(MMU_TEA)); | |
128 | #else | |
129 | printk(" "); | |
130 | #endif | |
131 | printk("%s\n", print_tainted()); | |
132 | ||
133 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
134 | regs->regs[0],regs->regs[1], | |
135 | regs->regs[2],regs->regs[3]); | |
136 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", | |
137 | regs->regs[4],regs->regs[5], | |
138 | regs->regs[6],regs->regs[7]); | |
139 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", | |
140 | regs->regs[8],regs->regs[9], | |
141 | regs->regs[10],regs->regs[11]); | |
142 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", | |
143 | regs->regs[12],regs->regs[13], | |
144 | regs->regs[14]); | |
145 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", | |
146 | regs->mach, regs->macl, regs->gbr, regs->pr); | |
147 | ||
6b002230 | 148 | show_trace(NULL, (unsigned long *)regs->regs[15], regs); |
1da177e4 LT |
149 | } |
150 | ||
151 | /* | |
152 | * Create a kernel thread | |
153 | */ | |
154 | ||
155 | /* | |
156 | * This is the mechanism for creating a new kernel thread. | |
157 | * | |
158 | */ | |
159 | extern void kernel_thread_helper(void); | |
160 | __asm__(".align 5\n" | |
161 | "kernel_thread_helper:\n\t" | |
162 | "jsr @r5\n\t" | |
163 | " nop\n\t" | |
164 | "mov.l 1f, r1\n\t" | |
165 | "jsr @r1\n\t" | |
166 | " mov r0, r4\n\t" | |
167 | ".align 2\n\t" | |
168 | "1:.long do_exit"); | |
169 | ||
aec5e0e1 | 170 | /* Don't use this in BL=1(cli). Or else, CPU resets! */ |
1da177e4 | 171 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
aec5e0e1 | 172 | { |
1da177e4 LT |
173 | struct pt_regs regs; |
174 | ||
175 | memset(®s, 0, sizeof(regs)); | |
aec5e0e1 PM |
176 | regs.regs[4] = (unsigned long)arg; |
177 | regs.regs[5] = (unsigned long)fn; | |
1da177e4 | 178 | |
aec5e0e1 | 179 | regs.pc = (unsigned long)kernel_thread_helper; |
1da177e4 LT |
180 | regs.sr = (1 << 30); |
181 | ||
182 | /* Ok, create the new process.. */ | |
aec5e0e1 PM |
183 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
184 | ®s, 0, NULL, NULL); | |
1da177e4 LT |
185 | } |
186 | ||
187 | /* | |
188 | * Free current thread data structures etc.. | |
189 | */ | |
190 | void exit_thread(void) | |
191 | { | |
192 | if (current->thread.ubc_pc) { | |
193 | current->thread.ubc_pc = 0; | |
194 | ubc_usercnt -= 1; | |
195 | } | |
196 | } | |
197 | ||
198 | void flush_thread(void) | |
199 | { | |
200 | #if defined(CONFIG_SH_FPU) | |
201 | struct task_struct *tsk = current; | |
1da177e4 | 202 | /* Forget lazy FPU state */ |
3cf0f4ec | 203 | clear_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
204 | clear_used_math(); |
205 | #endif | |
206 | } | |
207 | ||
208 | void release_thread(struct task_struct *dead_task) | |
209 | { | |
210 | /* do nothing */ | |
211 | } | |
212 | ||
213 | /* Fill in the fpu structure for a core dump.. */ | |
214 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
215 | { | |
216 | int fpvalid = 0; | |
217 | ||
218 | #if defined(CONFIG_SH_FPU) | |
219 | struct task_struct *tsk = current; | |
220 | ||
221 | fpvalid = !!tsk_used_math(tsk); | |
222 | if (fpvalid) { | |
223 | unlazy_fpu(tsk, regs); | |
224 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); | |
225 | } | |
226 | #endif | |
227 | ||
228 | return fpvalid; | |
229 | } | |
230 | ||
aec5e0e1 | 231 | /* |
1da177e4 LT |
232 | * Capture the user space registers if the task is not running (in user space) |
233 | */ | |
234 | int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) | |
235 | { | |
236 | struct pt_regs ptregs; | |
aec5e0e1 | 237 | |
3cf0f4ec | 238 | ptregs = *task_pt_regs(tsk); |
1da177e4 LT |
239 | elf_core_copy_regs(regs, &ptregs); |
240 | ||
241 | return 1; | |
242 | } | |
243 | ||
aec5e0e1 | 244 | int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpu) |
1da177e4 LT |
245 | { |
246 | int fpvalid = 0; | |
247 | ||
248 | #if defined(CONFIG_SH_FPU) | |
249 | fpvalid = !!tsk_used_math(tsk); | |
250 | if (fpvalid) { | |
3cf0f4ec | 251 | unlazy_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
252 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); |
253 | } | |
254 | #endif | |
255 | ||
256 | return fpvalid; | |
257 | } | |
258 | ||
259 | asmlinkage void ret_from_fork(void); | |
260 | ||
261 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
262 | unsigned long unused, | |
263 | struct task_struct *p, struct pt_regs *regs) | |
264 | { | |
2991be72 | 265 | struct thread_info *ti = task_thread_info(p); |
1da177e4 LT |
266 | struct pt_regs *childregs; |
267 | #if defined(CONFIG_SH_FPU) | |
268 | struct task_struct *tsk = current; | |
269 | ||
270 | unlazy_fpu(tsk, regs); | |
271 | p->thread.fpu = tsk->thread.fpu; | |
272 | copy_to_stopped_child_used_math(p); | |
273 | #endif | |
274 | ||
3cf0f4ec | 275 | childregs = task_pt_regs(p); |
1da177e4 LT |
276 | *childregs = *regs; |
277 | ||
278 | if (user_mode(regs)) { | |
279 | childregs->regs[15] = usp; | |
2991be72 | 280 | ti->addr_limit = USER_DS; |
1da177e4 | 281 | } else { |
e6bcf562 | 282 | childregs->regs[15] = (unsigned long)childregs; |
2991be72 | 283 | ti->addr_limit = KERNEL_DS; |
1da177e4 | 284 | } |
aec5e0e1 | 285 | |
e6bcf562 | 286 | if (clone_flags & CLONE_SETTLS) |
1da177e4 | 287 | childregs->gbr = childregs->regs[0]; |
aec5e0e1 | 288 | |
1da177e4 LT |
289 | childregs->regs[0] = 0; /* Set return value for child */ |
290 | ||
291 | p->thread.sp = (unsigned long) childregs; | |
292 | p->thread.pc = (unsigned long) ret_from_fork; | |
293 | ||
294 | p->thread.ubc_pc = 0; | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
1da177e4 | 299 | /* Tracing by user break controller. */ |
aec5e0e1 | 300 | static void ubc_set_tracing(int asid, unsigned long pc) |
1da177e4 | 301 | { |
8ae91b9a RS |
302 | #if defined(CONFIG_CPU_SH4A) |
303 | unsigned long val; | |
304 | ||
305 | val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE); | |
306 | val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid)); | |
307 | ||
308 | ctrl_outl(val, UBC_CBR0); | |
309 | ctrl_outl(pc, UBC_CAR0); | |
310 | ctrl_outl(0x0, UBC_CAMR0); | |
311 | ctrl_outl(0x0, UBC_CBCR); | |
312 | ||
313 | val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE); | |
314 | ctrl_outl(val, UBC_CRR0); | |
315 | ||
aec5e0e1 | 316 | /* Read UBC register that we wrote last, for checking update */ |
8ae91b9a RS |
317 | val = ctrl_inl(UBC_CRR0); |
318 | ||
319 | #else /* CONFIG_CPU_SH4A */ | |
1da177e4 LT |
320 | ctrl_outl(pc, UBC_BARA); |
321 | ||
a2d1a5fa | 322 | #ifdef CONFIG_MMU |
357d5946 | 323 | ctrl_outb(asid, UBC_BASRA); |
a2d1a5fa | 324 | #endif |
1da177e4 LT |
325 | |
326 | ctrl_outl(0, UBC_BAMRA); | |
327 | ||
11c19656 | 328 | if (current_cpu_data.type == CPU_SH7729 || |
3a2e117e PM |
329 | current_cpu_data.type == CPU_SH7710 || |
330 | current_cpu_data.type == CPU_SH7712) { | |
1da177e4 LT |
331 | ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA); |
332 | ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR); | |
333 | } else { | |
334 | ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA); | |
335 | ctrl_outw(BRCR_PCBA, UBC_BRCR); | |
336 | } | |
8ae91b9a | 337 | #endif /* CONFIG_CPU_SH4A */ |
1da177e4 LT |
338 | } |
339 | ||
340 | /* | |
341 | * switch_to(x,y) should switch tasks from x to y. | |
342 | * | |
343 | */ | |
aec5e0e1 PM |
344 | struct task_struct *__switch_to(struct task_struct *prev, |
345 | struct task_struct *next) | |
1da177e4 LT |
346 | { |
347 | #if defined(CONFIG_SH_FPU) | |
3cf0f4ec | 348 | unlazy_fpu(prev, task_pt_regs(prev)); |
1da177e4 LT |
349 | #endif |
350 | ||
351 | #ifdef CONFIG_PREEMPT | |
352 | { | |
353 | unsigned long flags; | |
354 | struct pt_regs *regs; | |
355 | ||
356 | local_irq_save(flags); | |
3cf0f4ec | 357 | regs = task_pt_regs(prev); |
1da177e4 LT |
358 | if (user_mode(regs) && regs->regs[15] >= 0xc0000000) { |
359 | int offset = (int)regs->regs[15]; | |
360 | ||
361 | /* Reset stack pointer: clear critical region mark */ | |
362 | regs->regs[15] = regs->regs[1]; | |
363 | if (regs->pc < regs->regs[0]) | |
364 | /* Go to rewind point */ | |
365 | regs->pc = regs->regs[0] + offset; | |
366 | } | |
367 | local_irq_restore(flags); | |
368 | } | |
369 | #endif | |
370 | ||
a2d1a5fa | 371 | #ifdef CONFIG_MMU |
1da177e4 LT |
372 | /* |
373 | * Restore the kernel mode register | |
aec5e0e1 | 374 | * k7 (r7_bank1) |
1da177e4 LT |
375 | */ |
376 | asm volatile("ldc %0, r7_bank" | |
377 | : /* no output */ | |
cafcfcaa | 378 | : "r" (task_thread_info(next))); |
a2d1a5fa | 379 | #endif |
1da177e4 | 380 | |
1da177e4 LT |
381 | /* If no tasks are using the UBC, we're done */ |
382 | if (ubc_usercnt == 0) | |
383 | /* If no tasks are using the UBC, we're done */; | |
384 | else if (next->thread.ubc_pc && next->mm) { | |
a2d1a5fa YS |
385 | int asid = 0; |
386 | #ifdef CONFIG_MMU | |
aec5e0e1 | 387 | asid |= cpu_asid(smp_processor_id(), next->mm); |
a2d1a5fa YS |
388 | #endif |
389 | ubc_set_tracing(asid, next->thread.ubc_pc); | |
1da177e4 | 390 | } else { |
8ae91b9a RS |
391 | #if defined(CONFIG_CPU_SH4A) |
392 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
393 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
394 | #else | |
1da177e4 LT |
395 | ctrl_outw(0, UBC_BBRA); |
396 | ctrl_outw(0, UBC_BBRB); | |
8ae91b9a | 397 | #endif |
1da177e4 | 398 | } |
1da177e4 LT |
399 | |
400 | return prev; | |
401 | } | |
402 | ||
403 | asmlinkage int sys_fork(unsigned long r4, unsigned long r5, | |
404 | unsigned long r6, unsigned long r7, | |
f0bc814c | 405 | struct pt_regs __regs) |
1da177e4 LT |
406 | { |
407 | #ifdef CONFIG_MMU | |
882c12c4 | 408 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
f0bc814c | 409 | return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL); |
1da177e4 LT |
410 | #else |
411 | /* fork almost works, enough to trick you into looking elsewhere :-( */ | |
412 | return -EINVAL; | |
413 | #endif | |
414 | } | |
415 | ||
416 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
417 | unsigned long parent_tidptr, | |
418 | unsigned long child_tidptr, | |
f0bc814c | 419 | struct pt_regs __regs) |
1da177e4 | 420 | { |
f0bc814c | 421 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 | 422 | if (!newsp) |
f0bc814c SM |
423 | newsp = regs->regs[15]; |
424 | return do_fork(clone_flags, newsp, regs, 0, | |
aec5e0e1 PM |
425 | (int __user *)parent_tidptr, |
426 | (int __user *)child_tidptr); | |
1da177e4 LT |
427 | } |
428 | ||
429 | /* | |
430 | * This is trivial, and on the face of it looks like it | |
431 | * could equally well be done in user mode. | |
432 | * | |
433 | * Not so, for quite unobvious reasons - register pressure. | |
434 | * In user mode vfork() cannot have a stack frame, and if | |
435 | * done by calling the "clone()" system call directly, you | |
436 | * do not have enough call-clobbered registers to hold all | |
437 | * the information you need. | |
438 | */ | |
439 | asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, | |
440 | unsigned long r6, unsigned long r7, | |
f0bc814c | 441 | struct pt_regs __regs) |
1da177e4 | 442 | { |
f0bc814c SM |
443 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
444 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs, | |
1da177e4 LT |
445 | 0, NULL, NULL); |
446 | } | |
447 | ||
448 | /* | |
449 | * sys_execve() executes a new program. | |
450 | */ | |
e08f457c PM |
451 | asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv, |
452 | char __user * __user *uenvp, unsigned long r7, | |
f0bc814c | 453 | struct pt_regs __regs) |
1da177e4 | 454 | { |
f0bc814c | 455 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 LT |
456 | int error; |
457 | char *filename; | |
458 | ||
e08f457c | 459 | filename = getname(ufilename); |
1da177e4 LT |
460 | error = PTR_ERR(filename); |
461 | if (IS_ERR(filename)) | |
462 | goto out; | |
463 | ||
e08f457c | 464 | error = do_execve(filename, uargv, uenvp, regs); |
1da177e4 LT |
465 | if (error == 0) { |
466 | task_lock(current); | |
467 | current->ptrace &= ~PT_DTRACE; | |
468 | task_unlock(current); | |
469 | } | |
470 | putname(filename); | |
471 | out: | |
472 | return error; | |
473 | } | |
474 | ||
475 | unsigned long get_wchan(struct task_struct *p) | |
476 | { | |
1da177e4 LT |
477 | unsigned long pc; |
478 | ||
479 | if (!p || p == current || p->state == TASK_RUNNING) | |
480 | return 0; | |
481 | ||
482 | /* | |
483 | * The same comment as on the Alpha applies here, too ... | |
484 | */ | |
485 | pc = thread_saved_pc(p); | |
c64ac9f0 DM |
486 | |
487 | #ifdef CONFIG_FRAME_POINTER | |
1da177e4 | 488 | if (in_sched_functions(pc)) { |
c64ac9f0 | 489 | unsigned long schedule_frame = (unsigned long)p->thread.sp; |
b652c23c | 490 | return ((unsigned long *)schedule_frame)[21]; |
1da177e4 | 491 | } |
c64ac9f0 | 492 | #endif |
b652c23c | 493 | |
1da177e4 LT |
494 | return pc; |
495 | } | |
496 | ||
f0bc814c | 497 | asmlinkage void break_point_trap(void) |
1da177e4 LT |
498 | { |
499 | /* Clear tracing. */ | |
8ae91b9a RS |
500 | #if defined(CONFIG_CPU_SH4A) |
501 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
502 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
503 | #else | |
1da177e4 LT |
504 | ctrl_outw(0, UBC_BBRA); |
505 | ctrl_outw(0, UBC_BBRB); | |
8ae91b9a | 506 | #endif |
1da177e4 LT |
507 | current->thread.ubc_pc = 0; |
508 | ubc_usercnt -= 1; | |
509 | ||
510 | force_sig(SIGTRAP, current); | |
511 | } | |
512 | ||
f413d0d9 PM |
513 | /* |
514 | * Generic trap handler. | |
515 | */ | |
516 | asmlinkage void debug_trap_handler(unsigned long r4, unsigned long r5, | |
517 | unsigned long r6, unsigned long r7, | |
518 | struct pt_regs __regs) | |
519 | { | |
520 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); | |
521 | ||
522 | /* Rewind */ | |
53f983a9 | 523 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); |
f413d0d9 | 524 | |
b118ca57 | 525 | if (notify_die(DIE_TRAP, "debug trap", regs, 0, regs->tra & 0xff, |
3a2e117e PM |
526 | SIGTRAP) == NOTIFY_STOP) |
527 | return; | |
528 | ||
f413d0d9 PM |
529 | force_sig(SIGTRAP, current); |
530 | } | |
531 | ||
532 | /* | |
533 | * Special handler for BUG() traps. | |
534 | */ | |
535 | asmlinkage void bug_trap_handler(unsigned long r4, unsigned long r5, | |
536 | unsigned long r6, unsigned long r7, | |
537 | struct pt_regs __regs) | |
1da177e4 | 538 | { |
f0bc814c SM |
539 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
540 | ||
dc34d312 | 541 | /* Rewind */ |
53f983a9 | 542 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); |
dc34d312 | 543 | |
b118ca57 | 544 | if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff, |
3a2e117e PM |
545 | SIGTRAP) == NOTIFY_STOP) |
546 | return; | |
547 | ||
dc34d312 PM |
548 | #ifdef CONFIG_BUG |
549 | if (__kernel_text_address(instruction_pointer(regs))) { | |
550 | u16 insn = *(u16 *)instruction_pointer(regs); | |
551 | if (insn == TRAPA_BUG_OPCODE) | |
552 | handle_BUG(regs); | |
553 | } | |
554 | #endif | |
555 | ||
1da177e4 LT |
556 | force_sig(SIGTRAP, current); |
557 | } |