blob: 3326a45749d9ee2c0af9c9c35b4934cc57c487d9 [file] [log] [blame]
Paul Mundtaec5e0e2006-12-25 09:51:47 +09001/*
2 * arch/sh/kernel/process.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Paul Mundtaec5e0e2006-12-25 09:51:47 +09004 * This file handles the architecture-dependent parts of process handling..
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Copyright (C) 1995 Linus Torvalds
7 *
8 * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
Ryusuke Sakato8ae91b92006-10-12 12:16:13 +09009 * Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
Paul Mundt3a2e1172007-05-01 16:33:10 +090010 * Copyright (C) 2002 - 2007 Paul Mundt
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/mm.h>
14#include <linux/elfcore.h>
Paul Mundta3310bb2006-02-01 03:06:08 -080015#include <linux/pm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/kallsyms.h>
Paul Mundta3310bb2006-02-01 03:06:08 -080017#include <linux/kexec.h>
Paul Mundtb118ca52007-05-09 10:55:38 +090018#include <linux/kdebug.h>
Paul Mundt57be2b42007-05-09 17:33:24 +090019#include <linux/tick.h>
Paul Mundte08f4572007-05-14 12:52:56 +090020#include <linux/reboot.h>
Paul Mundte06c4e52007-07-31 13:01:43 +090021#include <linux/fs.h>
Paul Mundt995bb782007-09-28 15:48:06 +090022#include <linux/preempt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/uaccess.h>
24#include <asm/mmu_context.h>
Paul Mundt5f8c9902007-05-08 11:55:21 +090025#include <asm/pgalloc.h>
Paul Mundtbd079992007-05-08 14:50:59 +090026#include <asm/system.h>
Paul Mundtb5233d02006-09-20 03:25:34 +090027#include <asm/ubc.h>
Paul Mundt9bbafce2008-03-26 19:02:47 +090028#include <asm/fpu.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Paul Mundtaec5e0e2006-12-25 09:51:47 +090030static int hlt_counter;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031int ubc_usercnt = 0;
32
Paul Mundta3310bb2006-02-01 03:06:08 -080033void (*pm_idle)(void);
Paul Mundta3310bb2006-02-01 03:06:08 -080034void (*pm_power_off)(void);
35EXPORT_SYMBOL(pm_power_off);
36
Paul Mundtf3a90222007-05-14 19:39:48 +090037static int __init nohlt_setup(char *__unused)
38{
39 hlt_counter = 1;
40 return 1;
41}
42__setup("nohlt", nohlt_setup);
43
44static int __init hlt_setup(char *__unused)
45{
46 hlt_counter = 0;
47 return 1;
48}
49__setup("hlt", hlt_setup);
50
Adrian Bunk4c1cfab2008-06-18 03:36:50 +030051static void default_idle(void)
Paul Mundta3310bb2006-02-01 03:06:08 -080052{
Paul Mundtf3a90222007-05-14 19:39:48 +090053 if (!hlt_counter) {
54 clear_thread_flag(TIF_POLLING_NRFLAG);
55 smp_mb__after_clear_bit();
56 set_bl_bit();
57 while (!need_resched())
58 cpu_sleep();
59 clear_bl_bit();
60 set_thread_flag(TIF_POLLING_NRFLAG);
61 } else
62 while (!need_resched())
63 cpu_relax();
Paul Mundta3310bb2006-02-01 03:06:08 -080064}
65
Nick Piggin64c7c8f2005-11-08 21:39:04 -080066void cpu_idle(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
Paul Mundtf3a90222007-05-14 19:39:48 +090068 set_thread_flag(TIF_POLLING_NRFLAG);
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 /* endless idle loop with no priority at all */
71 while (1) {
Paul Mundta3310bb2006-02-01 03:06:08 -080072 void (*idle)(void) = pm_idle;
73
74 if (!idle)
75 idle = default_idle;
76
Thomas Gleixnerb8f8c3c2008-07-18 17:27:28 +020077 tick_nohz_stop_sched_tick(1);
Paul Mundta3310bb2006-02-01 03:06:08 -080078 while (!need_resched())
79 idle();
Paul Mundt57be2b42007-05-09 17:33:24 +090080 tick_nohz_restart_sched_tick();
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Nick Piggin5bfb5d62005-11-08 21:39:01 -080082 preempt_enable_no_resched();
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 schedule();
Nick Piggin5bfb5d62005-11-08 21:39:01 -080084 preempt_disable();
Paul Mundt5f8c9902007-05-08 11:55:21 +090085 check_pgt_cache();
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
87}
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089void machine_restart(char * __unused)
90{
91 /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */
92 asm volatile("ldc %0, sr\n\t"
93 "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001));
94}
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096void machine_halt(void)
97{
Paul Mundta3310bb2006-02-01 03:06:08 -080098 local_irq_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 while (1)
101 cpu_sleep();
102}
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104void machine_power_off(void)
105{
Paul Mundta3310bb2006-02-01 03:06:08 -0800106 if (pm_power_off)
107 pm_power_off();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108}
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110void show_regs(struct pt_regs * regs)
111{
112 printk("\n");
Alexey Dobriyan19c58702007-10-18 23:40:41 -0700113 printk("Pid : %d, Comm: %20s\n", task_pid_nr(current), current->comm);
Paul Mundt6b002232006-10-12 17:07:45 +0900114 print_symbol("PC is at %s\n", instruction_pointer(regs));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 printk("PC : %08lx SP : %08lx SR : %08lx ",
116 regs->pc, regs->regs[15], regs->sr);
117#ifdef CONFIG_MMU
118 printk("TEA : %08x ", ctrl_inl(MMU_TEA));
119#else
120 printk(" ");
121#endif
122 printk("%s\n", print_tainted());
123
124 printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
125 regs->regs[0],regs->regs[1],
126 regs->regs[2],regs->regs[3]);
127 printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
128 regs->regs[4],regs->regs[5],
129 regs->regs[6],regs->regs[7]);
130 printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n",
131 regs->regs[8],regs->regs[9],
132 regs->regs[10],regs->regs[11]);
133 printk("R12 : %08lx R13 : %08lx R14 : %08lx\n",
134 regs->regs[12],regs->regs[13],
135 regs->regs[14]);
136 printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n",
137 regs->mach, regs->macl, regs->gbr, regs->pr);
138
Paul Mundt6b002232006-10-12 17:07:45 +0900139 show_trace(NULL, (unsigned long *)regs->regs[15], regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
142/*
143 * Create a kernel thread
144 */
145
146/*
147 * This is the mechanism for creating a new kernel thread.
148 *
149 */
150extern void kernel_thread_helper(void);
151__asm__(".align 5\n"
152 "kernel_thread_helper:\n\t"
153 "jsr @r5\n\t"
154 " nop\n\t"
155 "mov.l 1f, r1\n\t"
156 "jsr @r1\n\t"
157 " mov r0, r4\n\t"
158 ".align 2\n\t"
159 "1:.long do_exit");
160
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900161/* Don't use this in BL=1(cli). Or else, CPU resets! */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900163{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 struct pt_regs regs;
165
166 memset(&regs, 0, sizeof(regs));
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900167 regs.regs[4] = (unsigned long)arg;
168 regs.regs[5] = (unsigned long)fn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900170 regs.pc = (unsigned long)kernel_thread_helper;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 regs.sr = (1 << 30);
172
173 /* Ok, create the new process.. */
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900174 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
175 &regs, 0, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177
178/*
179 * Free current thread data structures etc..
180 */
181void exit_thread(void)
182{
183 if (current->thread.ubc_pc) {
184 current->thread.ubc_pc = 0;
185 ubc_usercnt -= 1;
186 }
187}
188
189void flush_thread(void)
190{
191#if defined(CONFIG_SH_FPU)
192 struct task_struct *tsk = current;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 /* Forget lazy FPU state */
Al Viro3cf0f4e2006-01-12 01:05:44 -0800194 clear_fpu(tsk, task_pt_regs(tsk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 clear_used_math();
196#endif
197}
198
199void release_thread(struct task_struct *dead_task)
200{
201 /* do nothing */
202}
203
204/* Fill in the fpu structure for a core dump.. */
205int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
206{
207 int fpvalid = 0;
208
209#if defined(CONFIG_SH_FPU)
210 struct task_struct *tsk = current;
211
212 fpvalid = !!tsk_used_math(tsk);
213 if (fpvalid) {
214 unlazy_fpu(tsk, regs);
215 memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
216 }
217#endif
218
219 return fpvalid;
220}
221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222asmlinkage void ret_from_fork(void);
223
224int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
225 unsigned long unused,
226 struct task_struct *p, struct pt_regs *regs)
227{
Paul Mundt2991be72006-09-27 17:07:07 +0900228 struct thread_info *ti = task_thread_info(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 struct pt_regs *childregs;
230#if defined(CONFIG_SH_FPU)
231 struct task_struct *tsk = current;
232
233 unlazy_fpu(tsk, regs);
234 p->thread.fpu = tsk->thread.fpu;
235 copy_to_stopped_child_used_math(p);
236#endif
237
Al Viro3cf0f4e2006-01-12 01:05:44 -0800238 childregs = task_pt_regs(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 *childregs = *regs;
240
241 if (user_mode(regs)) {
242 childregs->regs[15] = usp;
Paul Mundt2991be72006-09-27 17:07:07 +0900243 ti->addr_limit = USER_DS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 } else {
Hideo Saitoe6bcf562007-02-28 18:35:42 +0900245 childregs->regs[15] = (unsigned long)childregs;
Paul Mundt2991be72006-09-27 17:07:07 +0900246 ti->addr_limit = KERNEL_DS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 }
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900248
Hideo Saitoe6bcf562007-02-28 18:35:42 +0900249 if (clone_flags & CLONE_SETTLS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 childregs->gbr = childregs->regs[0];
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 childregs->regs[0] = 0; /* Set return value for child */
253
254 p->thread.sp = (unsigned long) childregs;
255 p->thread.pc = (unsigned long) ret_from_fork;
256
257 p->thread.ubc_pc = 0;
258
259 return 0;
260}
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262/* Tracing by user break controller. */
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900263static void ubc_set_tracing(int asid, unsigned long pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
Ryusuke Sakato8ae91b92006-10-12 12:16:13 +0900265#if defined(CONFIG_CPU_SH4A)
266 unsigned long val;
267
268 val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE);
269 val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid));
270
271 ctrl_outl(val, UBC_CBR0);
272 ctrl_outl(pc, UBC_CAR0);
273 ctrl_outl(0x0, UBC_CAMR0);
274 ctrl_outl(0x0, UBC_CBCR);
275
276 val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE);
277 ctrl_outl(val, UBC_CRR0);
278
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900279 /* Read UBC register that we wrote last, for checking update */
Ryusuke Sakato8ae91b92006-10-12 12:16:13 +0900280 val = ctrl_inl(UBC_CRR0);
281
282#else /* CONFIG_CPU_SH4A */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 ctrl_outl(pc, UBC_BARA);
284
Yoshinori Satoa2d1a5f2006-09-27 17:25:07 +0900285#ifdef CONFIG_MMU
Paul Mundt357d5942007-06-11 15:32:07 +0900286 ctrl_outb(asid, UBC_BASRA);
Yoshinori Satoa2d1a5f2006-09-27 17:25:07 +0900287#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 ctrl_outl(0, UBC_BAMRA);
290
Paul Mundt11c19652006-12-25 10:19:56 +0900291 if (current_cpu_data.type == CPU_SH7729 ||
Paul Mundt3a2e1172007-05-01 16:33:10 +0900292 current_cpu_data.type == CPU_SH7710 ||
293 current_cpu_data.type == CPU_SH7712) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA);
295 ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR);
296 } else {
297 ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA);
298 ctrl_outw(BRCR_PCBA, UBC_BRCR);
299 }
Ryusuke Sakato8ae91b92006-10-12 12:16:13 +0900300#endif /* CONFIG_CPU_SH4A */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
303/*
304 * switch_to(x,y) should switch tasks from x to y.
305 *
306 */
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900307struct task_struct *__switch_to(struct task_struct *prev,
308 struct task_struct *next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
310#if defined(CONFIG_SH_FPU)
Al Viro3cf0f4e2006-01-12 01:05:44 -0800311 unlazy_fpu(prev, task_pt_regs(prev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312#endif
313
Yoshinori Satoa2d1a5f2006-09-27 17:25:07 +0900314#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 /*
316 * Restore the kernel mode register
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900317 * k7 (r7_bank1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 */
319 asm volatile("ldc %0, r7_bank"
320 : /* no output */
Al Virocafcfca2006-01-12 01:05:45 -0800321 : "r" (task_thread_info(next)));
Yoshinori Satoa2d1a5f2006-09-27 17:25:07 +0900322#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 /* If no tasks are using the UBC, we're done */
325 if (ubc_usercnt == 0)
326 /* If no tasks are using the UBC, we're done */;
327 else if (next->thread.ubc_pc && next->mm) {
Yoshinori Satoa2d1a5f2006-09-27 17:25:07 +0900328 int asid = 0;
329#ifdef CONFIG_MMU
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900330 asid |= cpu_asid(smp_processor_id(), next->mm);
Yoshinori Satoa2d1a5f2006-09-27 17:25:07 +0900331#endif
332 ubc_set_tracing(asid, next->thread.ubc_pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 } else {
Ryusuke Sakato8ae91b92006-10-12 12:16:13 +0900334#if defined(CONFIG_CPU_SH4A)
335 ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
336 ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
337#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 ctrl_outw(0, UBC_BBRA);
339 ctrl_outw(0, UBC_BBRB);
Ryusuke Sakato8ae91b92006-10-12 12:16:13 +0900340#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 return prev;
344}
345
346asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
347 unsigned long r6, unsigned long r7,
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900348 struct pt_regs __regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349{
350#ifdef CONFIG_MMU
Paul Mundt882c12c2007-05-14 17:26:34 +0900351 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900352 return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353#else
354 /* fork almost works, enough to trick you into looking elsewhere :-( */
355 return -EINVAL;
356#endif
357}
358
359asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
360 unsigned long parent_tidptr,
361 unsigned long child_tidptr,
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900362 struct pt_regs __regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900364 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 if (!newsp)
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900366 newsp = regs->regs[15];
367 return do_fork(clone_flags, newsp, regs, 0,
Paul Mundtaec5e0e2006-12-25 09:51:47 +0900368 (int __user *)parent_tidptr,
369 (int __user *)child_tidptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
372/*
373 * This is trivial, and on the face of it looks like it
374 * could equally well be done in user mode.
375 *
376 * Not so, for quite unobvious reasons - register pressure.
377 * In user mode vfork() cannot have a stack frame, and if
378 * done by calling the "clone()" system call directly, you
379 * do not have enough call-clobbered registers to hold all
380 * the information you need.
381 */
382asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
383 unsigned long r6, unsigned long r7,
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900384 struct pt_regs __regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385{
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900386 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
387 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 0, NULL, NULL);
389}
390
391/*
392 * sys_execve() executes a new program.
393 */
Paul Mundte08f4572007-05-14 12:52:56 +0900394asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv,
395 char __user * __user *uenvp, unsigned long r7,
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900396 struct pt_regs __regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397{
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900398 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 int error;
400 char *filename;
401
Paul Mundte08f4572007-05-14 12:52:56 +0900402 filename = getname(ufilename);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 error = PTR_ERR(filename);
404 if (IS_ERR(filename))
405 goto out;
406
Paul Mundte08f4572007-05-14 12:52:56 +0900407 error = do_execve(filename, uargv, uenvp, regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 if (error == 0) {
409 task_lock(current);
410 current->ptrace &= ~PT_DTRACE;
411 task_unlock(current);
412 }
413 putname(filename);
414out:
415 return error;
416}
417
418unsigned long get_wchan(struct task_struct *p)
419{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 unsigned long pc;
421
422 if (!p || p == current || p->state == TASK_RUNNING)
423 return 0;
424
425 /*
426 * The same comment as on the Alpha applies here, too ...
427 */
428 pc = thread_saved_pc(p);
David McCulloughc64ac9f2007-07-26 17:46:07 +0900429
430#ifdef CONFIG_FRAME_POINTER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (in_sched_functions(pc)) {
David McCulloughc64ac9f2007-07-26 17:46:07 +0900432 unsigned long schedule_frame = (unsigned long)p->thread.sp;
Paul Mundtb652c232006-12-08 17:46:29 +0900433 return ((unsigned long *)schedule_frame)[21];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 }
David McCulloughc64ac9f2007-07-26 17:46:07 +0900435#endif
Paul Mundtb652c232006-12-08 17:46:29 +0900436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return pc;
438}
439
Stuart Menefyf0bc8142006-11-21 11:16:57 +0900440asmlinkage void break_point_trap(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
442 /* Clear tracing. */
Ryusuke Sakato8ae91b92006-10-12 12:16:13 +0900443#if defined(CONFIG_CPU_SH4A)
444 ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
445 ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
446#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 ctrl_outw(0, UBC_BBRA);
448 ctrl_outw(0, UBC_BBRB);
Ryusuke Sakato8ae91b92006-10-12 12:16:13 +0900449#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 current->thread.ubc_pc = 0;
451 ubc_usercnt -= 1;
452
453 force_sig(SIGTRAP, current);
454}