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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> |
1da177e4 LT |
20 | #include <asm/uaccess.h> |
21 | #include <asm/mmu_context.h> | |
5f8c9908 | 22 | #include <asm/pgalloc.h> |
bd079997 | 23 | #include <asm/system.h> |
b5233d07 | 24 | #include <asm/ubc.h> |
1da177e4 | 25 | |
aec5e0e1 | 26 | static int hlt_counter; |
1da177e4 LT |
27 | int ubc_usercnt = 0; |
28 | ||
a3310bbd | 29 | void (*pm_idle)(void); |
a3310bbd PM |
30 | void (*pm_power_off)(void); |
31 | EXPORT_SYMBOL(pm_power_off); | |
32 | ||
1da177e4 LT |
33 | void disable_hlt(void) |
34 | { | |
35 | hlt_counter++; | |
36 | } | |
1da177e4 LT |
37 | EXPORT_SYMBOL(disable_hlt); |
38 | ||
39 | void enable_hlt(void) | |
40 | { | |
41 | hlt_counter--; | |
42 | } | |
1da177e4 LT |
43 | EXPORT_SYMBOL(enable_hlt); |
44 | ||
f3a9022f PM |
45 | static int __init nohlt_setup(char *__unused) |
46 | { | |
47 | hlt_counter = 1; | |
48 | return 1; | |
49 | } | |
50 | __setup("nohlt", nohlt_setup); | |
51 | ||
52 | static int __init hlt_setup(char *__unused) | |
53 | { | |
54 | hlt_counter = 0; | |
55 | return 1; | |
56 | } | |
57 | __setup("hlt", hlt_setup); | |
58 | ||
a3310bbd PM |
59 | void default_idle(void) |
60 | { | |
f3a9022f PM |
61 | if (!hlt_counter) { |
62 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
63 | smp_mb__after_clear_bit(); | |
64 | set_bl_bit(); | |
65 | while (!need_resched()) | |
66 | cpu_sleep(); | |
67 | clear_bl_bit(); | |
68 | set_thread_flag(TIF_POLLING_NRFLAG); | |
69 | } else | |
70 | while (!need_resched()) | |
71 | cpu_relax(); | |
a3310bbd PM |
72 | } |
73 | ||
64c7c8f8 | 74 | void cpu_idle(void) |
1da177e4 | 75 | { |
f3a9022f PM |
76 | set_thread_flag(TIF_POLLING_NRFLAG); |
77 | ||
1da177e4 LT |
78 | /* endless idle loop with no priority at all */ |
79 | while (1) { | |
a3310bbd PM |
80 | void (*idle)(void) = pm_idle; |
81 | ||
82 | if (!idle) | |
83 | idle = default_idle; | |
84 | ||
57be2b48 | 85 | tick_nohz_stop_sched_tick(); |
a3310bbd PM |
86 | while (!need_resched()) |
87 | idle(); | |
57be2b48 | 88 | tick_nohz_restart_sched_tick(); |
1da177e4 | 89 | |
5bfb5d69 | 90 | preempt_enable_no_resched(); |
1da177e4 | 91 | schedule(); |
5bfb5d69 | 92 | preempt_disable(); |
5f8c9908 | 93 | check_pgt_cache(); |
1da177e4 LT |
94 | } |
95 | } | |
96 | ||
1da177e4 LT |
97 | void machine_restart(char * __unused) |
98 | { | |
99 | /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */ | |
100 | asm volatile("ldc %0, sr\n\t" | |
101 | "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001)); | |
102 | } | |
103 | ||
1da177e4 LT |
104 | void machine_halt(void) |
105 | { | |
a3310bbd | 106 | local_irq_disable(); |
1da177e4 | 107 | |
1da177e4 LT |
108 | while (1) |
109 | cpu_sleep(); | |
110 | } | |
111 | ||
1da177e4 LT |
112 | void machine_power_off(void) |
113 | { | |
a3310bbd PM |
114 | if (pm_power_off) |
115 | pm_power_off(); | |
1da177e4 LT |
116 | } |
117 | ||
1da177e4 LT |
118 | void show_regs(struct pt_regs * regs) |
119 | { | |
120 | printk("\n"); | |
121 | printk("Pid : %d, Comm: %20s\n", current->pid, current->comm); | |
6b002230 | 122 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
1da177e4 LT |
123 | printk("PC : %08lx SP : %08lx SR : %08lx ", |
124 | regs->pc, regs->regs[15], regs->sr); | |
125 | #ifdef CONFIG_MMU | |
126 | printk("TEA : %08x ", ctrl_inl(MMU_TEA)); | |
127 | #else | |
128 | printk(" "); | |
129 | #endif | |
130 | printk("%s\n", print_tainted()); | |
131 | ||
132 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
133 | regs->regs[0],regs->regs[1], | |
134 | regs->regs[2],regs->regs[3]); | |
135 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", | |
136 | regs->regs[4],regs->regs[5], | |
137 | regs->regs[6],regs->regs[7]); | |
138 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", | |
139 | regs->regs[8],regs->regs[9], | |
140 | regs->regs[10],regs->regs[11]); | |
141 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", | |
142 | regs->regs[12],regs->regs[13], | |
143 | regs->regs[14]); | |
144 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", | |
145 | regs->mach, regs->macl, regs->gbr, regs->pr); | |
146 | ||
6b002230 | 147 | show_trace(NULL, (unsigned long *)regs->regs[15], regs); |
1da177e4 LT |
148 | } |
149 | ||
150 | /* | |
151 | * Create a kernel thread | |
152 | */ | |
153 | ||
154 | /* | |
155 | * This is the mechanism for creating a new kernel thread. | |
156 | * | |
157 | */ | |
158 | extern void kernel_thread_helper(void); | |
159 | __asm__(".align 5\n" | |
160 | "kernel_thread_helper:\n\t" | |
161 | "jsr @r5\n\t" | |
162 | " nop\n\t" | |
163 | "mov.l 1f, r1\n\t" | |
164 | "jsr @r1\n\t" | |
165 | " mov r0, r4\n\t" | |
166 | ".align 2\n\t" | |
167 | "1:.long do_exit"); | |
168 | ||
aec5e0e1 | 169 | /* Don't use this in BL=1(cli). Or else, CPU resets! */ |
1da177e4 | 170 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
aec5e0e1 | 171 | { |
1da177e4 LT |
172 | struct pt_regs regs; |
173 | ||
174 | memset(®s, 0, sizeof(regs)); | |
aec5e0e1 PM |
175 | regs.regs[4] = (unsigned long)arg; |
176 | regs.regs[5] = (unsigned long)fn; | |
1da177e4 | 177 | |
aec5e0e1 | 178 | regs.pc = (unsigned long)kernel_thread_helper; |
1da177e4 LT |
179 | regs.sr = (1 << 30); |
180 | ||
181 | /* Ok, create the new process.. */ | |
aec5e0e1 PM |
182 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
183 | ®s, 0, NULL, NULL); | |
1da177e4 LT |
184 | } |
185 | ||
186 | /* | |
187 | * Free current thread data structures etc.. | |
188 | */ | |
189 | void exit_thread(void) | |
190 | { | |
191 | if (current->thread.ubc_pc) { | |
192 | current->thread.ubc_pc = 0; | |
193 | ubc_usercnt -= 1; | |
194 | } | |
195 | } | |
196 | ||
197 | void flush_thread(void) | |
198 | { | |
199 | #if defined(CONFIG_SH_FPU) | |
200 | struct task_struct *tsk = current; | |
1da177e4 | 201 | /* Forget lazy FPU state */ |
3cf0f4ec | 202 | clear_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
203 | clear_used_math(); |
204 | #endif | |
205 | } | |
206 | ||
207 | void release_thread(struct task_struct *dead_task) | |
208 | { | |
209 | /* do nothing */ | |
210 | } | |
211 | ||
212 | /* Fill in the fpu structure for a core dump.. */ | |
213 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
214 | { | |
215 | int fpvalid = 0; | |
216 | ||
217 | #if defined(CONFIG_SH_FPU) | |
218 | struct task_struct *tsk = current; | |
219 | ||
220 | fpvalid = !!tsk_used_math(tsk); | |
221 | if (fpvalid) { | |
222 | unlazy_fpu(tsk, regs); | |
223 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); | |
224 | } | |
225 | #endif | |
226 | ||
227 | return fpvalid; | |
228 | } | |
229 | ||
aec5e0e1 | 230 | /* |
1da177e4 LT |
231 | * Capture the user space registers if the task is not running (in user space) |
232 | */ | |
233 | int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) | |
234 | { | |
235 | struct pt_regs ptregs; | |
aec5e0e1 | 236 | |
3cf0f4ec | 237 | ptregs = *task_pt_regs(tsk); |
1da177e4 LT |
238 | elf_core_copy_regs(regs, &ptregs); |
239 | ||
240 | return 1; | |
241 | } | |
242 | ||
aec5e0e1 | 243 | int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpu) |
1da177e4 LT |
244 | { |
245 | int fpvalid = 0; | |
246 | ||
247 | #if defined(CONFIG_SH_FPU) | |
248 | fpvalid = !!tsk_used_math(tsk); | |
249 | if (fpvalid) { | |
3cf0f4ec | 250 | unlazy_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
251 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); |
252 | } | |
253 | #endif | |
254 | ||
255 | return fpvalid; | |
256 | } | |
257 | ||
258 | asmlinkage void ret_from_fork(void); | |
259 | ||
260 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
261 | unsigned long unused, | |
262 | struct task_struct *p, struct pt_regs *regs) | |
263 | { | |
2991be72 | 264 | struct thread_info *ti = task_thread_info(p); |
1da177e4 LT |
265 | struct pt_regs *childregs; |
266 | #if defined(CONFIG_SH_FPU) | |
267 | struct task_struct *tsk = current; | |
268 | ||
269 | unlazy_fpu(tsk, regs); | |
270 | p->thread.fpu = tsk->thread.fpu; | |
271 | copy_to_stopped_child_used_math(p); | |
272 | #endif | |
273 | ||
3cf0f4ec | 274 | childregs = task_pt_regs(p); |
1da177e4 LT |
275 | *childregs = *regs; |
276 | ||
277 | if (user_mode(regs)) { | |
278 | childregs->regs[15] = usp; | |
2991be72 | 279 | ti->addr_limit = USER_DS; |
1da177e4 | 280 | } else { |
e6bcf562 | 281 | childregs->regs[15] = (unsigned long)childregs; |
2991be72 | 282 | ti->addr_limit = KERNEL_DS; |
1da177e4 | 283 | } |
aec5e0e1 | 284 | |
e6bcf562 | 285 | if (clone_flags & CLONE_SETTLS) |
1da177e4 | 286 | childregs->gbr = childregs->regs[0]; |
aec5e0e1 | 287 | |
1da177e4 LT |
288 | childregs->regs[0] = 0; /* Set return value for child */ |
289 | ||
290 | p->thread.sp = (unsigned long) childregs; | |
291 | p->thread.pc = (unsigned long) ret_from_fork; | |
292 | ||
293 | p->thread.ubc_pc = 0; | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
1da177e4 | 298 | /* Tracing by user break controller. */ |
aec5e0e1 | 299 | static void ubc_set_tracing(int asid, unsigned long pc) |
1da177e4 | 300 | { |
8ae91b9a RS |
301 | #if defined(CONFIG_CPU_SH4A) |
302 | unsigned long val; | |
303 | ||
304 | val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE); | |
305 | val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid)); | |
306 | ||
307 | ctrl_outl(val, UBC_CBR0); | |
308 | ctrl_outl(pc, UBC_CAR0); | |
309 | ctrl_outl(0x0, UBC_CAMR0); | |
310 | ctrl_outl(0x0, UBC_CBCR); | |
311 | ||
312 | val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE); | |
313 | ctrl_outl(val, UBC_CRR0); | |
314 | ||
aec5e0e1 | 315 | /* Read UBC register that we wrote last, for checking update */ |
8ae91b9a RS |
316 | val = ctrl_inl(UBC_CRR0); |
317 | ||
318 | #else /* CONFIG_CPU_SH4A */ | |
1da177e4 LT |
319 | ctrl_outl(pc, UBC_BARA); |
320 | ||
a2d1a5fa | 321 | #ifdef CONFIG_MMU |
1da177e4 | 322 | /* We don't have any ASID settings for the SH-2! */ |
11c19656 | 323 | if (current_cpu_data.type != CPU_SH7604) |
1da177e4 | 324 | ctrl_outb(asid, UBC_BASRA); |
a2d1a5fa | 325 | #endif |
1da177e4 LT |
326 | |
327 | ctrl_outl(0, UBC_BAMRA); | |
328 | ||
11c19656 | 329 | if (current_cpu_data.type == CPU_SH7729 || |
3a2e117e PM |
330 | current_cpu_data.type == CPU_SH7710 || |
331 | current_cpu_data.type == CPU_SH7712) { | |
1da177e4 LT |
332 | ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA); |
333 | ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR); | |
334 | } else { | |
335 | ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA); | |
336 | ctrl_outw(BRCR_PCBA, UBC_BRCR); | |
337 | } | |
8ae91b9a | 338 | #endif /* CONFIG_CPU_SH4A */ |
1da177e4 LT |
339 | } |
340 | ||
341 | /* | |
342 | * switch_to(x,y) should switch tasks from x to y. | |
343 | * | |
344 | */ | |
aec5e0e1 PM |
345 | struct task_struct *__switch_to(struct task_struct *prev, |
346 | struct task_struct *next) | |
1da177e4 LT |
347 | { |
348 | #if defined(CONFIG_SH_FPU) | |
3cf0f4ec | 349 | unlazy_fpu(prev, task_pt_regs(prev)); |
1da177e4 LT |
350 | #endif |
351 | ||
352 | #ifdef CONFIG_PREEMPT | |
353 | { | |
354 | unsigned long flags; | |
355 | struct pt_regs *regs; | |
356 | ||
357 | local_irq_save(flags); | |
3cf0f4ec | 358 | regs = task_pt_regs(prev); |
1da177e4 LT |
359 | if (user_mode(regs) && regs->regs[15] >= 0xc0000000) { |
360 | int offset = (int)regs->regs[15]; | |
361 | ||
362 | /* Reset stack pointer: clear critical region mark */ | |
363 | regs->regs[15] = regs->regs[1]; | |
364 | if (regs->pc < regs->regs[0]) | |
365 | /* Go to rewind point */ | |
366 | regs->pc = regs->regs[0] + offset; | |
367 | } | |
368 | local_irq_restore(flags); | |
369 | } | |
370 | #endif | |
371 | ||
a2d1a5fa | 372 | #ifdef CONFIG_MMU |
1da177e4 LT |
373 | /* |
374 | * Restore the kernel mode register | |
aec5e0e1 | 375 | * k7 (r7_bank1) |
1da177e4 LT |
376 | */ |
377 | asm volatile("ldc %0, r7_bank" | |
378 | : /* no output */ | |
cafcfcaa | 379 | : "r" (task_thread_info(next))); |
a2d1a5fa | 380 | #endif |
1da177e4 | 381 | |
1da177e4 LT |
382 | /* If no tasks are using the UBC, we're done */ |
383 | if (ubc_usercnt == 0) | |
384 | /* If no tasks are using the UBC, we're done */; | |
385 | else if (next->thread.ubc_pc && next->mm) { | |
a2d1a5fa YS |
386 | int asid = 0; |
387 | #ifdef CONFIG_MMU | |
aec5e0e1 | 388 | asid |= cpu_asid(smp_processor_id(), next->mm); |
a2d1a5fa YS |
389 | #endif |
390 | ubc_set_tracing(asid, next->thread.ubc_pc); | |
1da177e4 | 391 | } else { |
8ae91b9a RS |
392 | #if defined(CONFIG_CPU_SH4A) |
393 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
394 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
395 | #else | |
1da177e4 LT |
396 | ctrl_outw(0, UBC_BBRA); |
397 | ctrl_outw(0, UBC_BBRB); | |
8ae91b9a | 398 | #endif |
1da177e4 | 399 | } |
1da177e4 LT |
400 | |
401 | return prev; | |
402 | } | |
403 | ||
404 | asmlinkage int sys_fork(unsigned long r4, unsigned long r5, | |
405 | unsigned long r6, unsigned long r7, | |
f0bc814c | 406 | struct pt_regs __regs) |
1da177e4 | 407 | { |
f0bc814c | 408 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 | 409 | #ifdef CONFIG_MMU |
f0bc814c | 410 | return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL); |
1da177e4 LT |
411 | #else |
412 | /* fork almost works, enough to trick you into looking elsewhere :-( */ | |
413 | return -EINVAL; | |
414 | #endif | |
415 | } | |
416 | ||
417 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
418 | unsigned long parent_tidptr, | |
419 | unsigned long child_tidptr, | |
f0bc814c | 420 | struct pt_regs __regs) |
1da177e4 | 421 | { |
f0bc814c | 422 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 | 423 | if (!newsp) |
f0bc814c SM |
424 | newsp = regs->regs[15]; |
425 | return do_fork(clone_flags, newsp, regs, 0, | |
aec5e0e1 PM |
426 | (int __user *)parent_tidptr, |
427 | (int __user *)child_tidptr); | |
1da177e4 LT |
428 | } |
429 | ||
430 | /* | |
431 | * This is trivial, and on the face of it looks like it | |
432 | * could equally well be done in user mode. | |
433 | * | |
434 | * Not so, for quite unobvious reasons - register pressure. | |
435 | * In user mode vfork() cannot have a stack frame, and if | |
436 | * done by calling the "clone()" system call directly, you | |
437 | * do not have enough call-clobbered registers to hold all | |
438 | * the information you need. | |
439 | */ | |
440 | asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, | |
441 | unsigned long r6, unsigned long r7, | |
f0bc814c | 442 | struct pt_regs __regs) |
1da177e4 | 443 | { |
f0bc814c SM |
444 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
445 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs, | |
1da177e4 LT |
446 | 0, NULL, NULL); |
447 | } | |
448 | ||
449 | /* | |
450 | * sys_execve() executes a new program. | |
451 | */ | |
452 | asmlinkage int sys_execve(char *ufilename, char **uargv, | |
453 | char **uenvp, unsigned long r7, | |
f0bc814c | 454 | struct pt_regs __regs) |
1da177e4 | 455 | { |
f0bc814c | 456 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 LT |
457 | int error; |
458 | char *filename; | |
459 | ||
460 | filename = getname((char __user *)ufilename); | |
461 | error = PTR_ERR(filename); | |
462 | if (IS_ERR(filename)) | |
463 | goto out; | |
464 | ||
465 | error = do_execve(filename, | |
466 | (char __user * __user *)uargv, | |
467 | (char __user * __user *)uenvp, | |
f0bc814c | 468 | regs); |
1da177e4 LT |
469 | if (error == 0) { |
470 | task_lock(current); | |
471 | current->ptrace &= ~PT_DTRACE; | |
472 | task_unlock(current); | |
473 | } | |
474 | putname(filename); | |
475 | out: | |
476 | return error; | |
477 | } | |
478 | ||
479 | unsigned long get_wchan(struct task_struct *p) | |
480 | { | |
481 | unsigned long schedule_frame; | |
482 | unsigned long pc; | |
483 | ||
484 | if (!p || p == current || p->state == TASK_RUNNING) | |
485 | return 0; | |
486 | ||
487 | /* | |
488 | * The same comment as on the Alpha applies here, too ... | |
489 | */ | |
490 | pc = thread_saved_pc(p); | |
491 | if (in_sched_functions(pc)) { | |
b652c23c PM |
492 | schedule_frame = (unsigned long)p->thread.sp; |
493 | return ((unsigned long *)schedule_frame)[21]; | |
1da177e4 | 494 | } |
b652c23c | 495 | |
1da177e4 LT |
496 | return pc; |
497 | } | |
498 | ||
f0bc814c | 499 | asmlinkage void break_point_trap(void) |
1da177e4 LT |
500 | { |
501 | /* Clear tracing. */ | |
8ae91b9a RS |
502 | #if defined(CONFIG_CPU_SH4A) |
503 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
504 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
505 | #else | |
1da177e4 LT |
506 | ctrl_outw(0, UBC_BBRA); |
507 | ctrl_outw(0, UBC_BBRB); | |
8ae91b9a | 508 | #endif |
1da177e4 LT |
509 | current->thread.ubc_pc = 0; |
510 | ubc_usercnt -= 1; | |
511 | ||
512 | force_sig(SIGTRAP, current); | |
513 | } | |
514 | ||
f413d0d9 PM |
515 | /* |
516 | * Generic trap handler. | |
517 | */ | |
518 | asmlinkage void debug_trap_handler(unsigned long r4, unsigned long r5, | |
519 | unsigned long r6, unsigned long r7, | |
520 | struct pt_regs __regs) | |
521 | { | |
522 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); | |
523 | ||
524 | /* Rewind */ | |
53f983a9 | 525 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); |
f413d0d9 | 526 | |
b118ca57 | 527 | if (notify_die(DIE_TRAP, "debug trap", regs, 0, regs->tra & 0xff, |
3a2e117e PM |
528 | SIGTRAP) == NOTIFY_STOP) |
529 | return; | |
530 | ||
f413d0d9 PM |
531 | force_sig(SIGTRAP, current); |
532 | } | |
533 | ||
534 | /* | |
535 | * Special handler for BUG() traps. | |
536 | */ | |
537 | asmlinkage void bug_trap_handler(unsigned long r4, unsigned long r5, | |
538 | unsigned long r6, unsigned long r7, | |
539 | struct pt_regs __regs) | |
1da177e4 | 540 | { |
f0bc814c SM |
541 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
542 | ||
dc34d312 | 543 | /* Rewind */ |
53f983a9 | 544 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); |
dc34d312 | 545 | |
b118ca57 | 546 | if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff, |
3a2e117e PM |
547 | SIGTRAP) == NOTIFY_STOP) |
548 | return; | |
549 | ||
dc34d312 PM |
550 | #ifdef CONFIG_BUG |
551 | if (__kernel_text_address(instruction_pointer(regs))) { | |
552 | u16 insn = *(u16 *)instruction_pointer(regs); | |
553 | if (insn == TRAPA_BUG_OPCODE) | |
554 | handle_BUG(regs); | |
555 | } | |
556 | #endif | |
557 | ||
1da177e4 LT |
558 | force_sig(SIGTRAP, current); |
559 | } |