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1/* process.c: FRV specific parts of process handling
2 *
3 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * - Derived from arch/m68k/kernel/process.c
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#include <linux/module.h>
14#include <linux/errno.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/smp.h>
19#include <linux/stddef.h>
20#include <linux/unistd.h>
21#include <linux/ptrace.h>
22#include <linux/slab.h>
23#include <linux/user.h>
24#include <linux/elf.h>
25#include <linux/reboot.h>
26#include <linux/interrupt.h>
27#include <linux/pagemap.h>
28
29#include <asm/asm-offsets.h>
30#include <asm/uaccess.h>
31#include <asm/setup.h>
32#include <asm/pgtable.h>
33#include <asm/tlb.h>
34#include <asm/gdb-stub.h>
35#include <asm/mb-regs.h>
36
37#include "local.h"
38
39asmlinkage void ret_from_fork(void);
40
41#include <asm/pgalloc.h>
42
43void (*pm_power_off)(void);
44EXPORT_SYMBOL(pm_power_off);
45
46static void core_sleep_idle(void)
47{
48#ifdef LED_DEBUG_SLEEP
49 /* Show that we're sleeping... */
50 __set_LEDS(0x55aa);
51#endif
52 frv_cpu_core_sleep();
53#ifdef LED_DEBUG_SLEEP
54 /* ... and that we woke up */
55 __set_LEDS(0);
56#endif
57 mb();
58}
59
60void (*idle)(void) = core_sleep_idle;
61
62/*
63 * The idle thread. There's no useful work to be
64 * done, so just try to conserve power and have a
65 * low exit latency (ie sit in a loop waiting for
66 * somebody to say that they'd like to reschedule)
67 */
68void cpu_idle(void)
69{
70 /* endless idle loop with no priority at all */
71 while (1) {
72 while (!need_resched()) {
73 check_pgt_cache();
74
75 if (!frv_dma_inprogress && idle)
76 idle();
77 }
78
79 schedule_preempt_disabled();
80 }
81}
82
83void machine_restart(char * __unused)
84{
85 unsigned long reset_addr;
86#ifdef CONFIG_GDBSTUB
87 gdbstub_exit(0);
88#endif
89
90 if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551)
91 reset_addr = 0xfefff500;
92 else
93 reset_addr = 0xfeff0500;
94
95 /* Software reset. */
96 asm volatile(" dcef @(gr0,gr0),1 ! membar !"
97 " sti %1,@(%0,0) !"
98 " nop ! nop ! nop ! nop ! nop ! "
99 " nop ! nop ! nop ! nop ! nop ! "
100 " nop ! nop ! nop ! nop ! nop ! "
101 " nop ! nop ! nop ! nop ! nop ! "
102 : : "r" (reset_addr), "r" (1) );
103
104 for (;;)
105 ;
106}
107
108void machine_halt(void)
109{
110#ifdef CONFIG_GDBSTUB
111 gdbstub_exit(0);
112#endif
113
114 for (;;);
115}
116
117void machine_power_off(void)
118{
119#ifdef CONFIG_GDBSTUB
120 gdbstub_exit(0);
121#endif
122
123 for (;;);
124}
125
126void flush_thread(void)
127{
128 /* nothing */
129}
130
131inline unsigned long user_stack(const struct pt_regs *regs)
132{
133 while (regs->next_frame)
134 regs = regs->next_frame;
135 return user_mode(regs) ? regs->sp : 0;
136}
137
138asmlinkage int sys_fork(void)
139{
140#ifndef CONFIG_MMU
141 /* fork almost works, enough to trick you into looking elsewhere:-( */
142 return -EINVAL;
143#else
144 return do_fork(SIGCHLD, user_stack(__frame), __frame, 0, NULL, NULL);
145#endif
146}
147
148asmlinkage int sys_vfork(void)
149{
150 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, user_stack(__frame), __frame, 0,
151 NULL, NULL);
152}
153
154/*****************************************************************************/
155/*
156 * clone a process
157 * - tlsptr is retrieved by copy_thread()
158 */
159asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
160 int __user *parent_tidptr, int __user *child_tidptr,
161 int __user *tlsptr)
162{
163 if (!newsp)
164 newsp = user_stack(__frame);
165 return do_fork(clone_flags, newsp, __frame, 0, parent_tidptr, child_tidptr);
166} /* end sys_clone() */
167
168/*
169 * set up the kernel stack and exception frames for a new process
170 */
171int copy_thread(unsigned long clone_flags,
172 unsigned long usp, unsigned long topstk,
173 struct task_struct *p, struct pt_regs *regs)
174{
175 struct pt_regs *childregs0, *childregs, *regs0;
176
177 regs0 = __kernel_frame0_ptr;
178 childregs0 = (struct pt_regs *)
179 (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
180 childregs = childregs0;
181
182 /* set up the userspace frame (the only place that the USP is stored) */
183 *childregs0 = *regs0;
184
185 childregs0->gr8 = 0;
186 childregs0->sp = usp;
187 childregs0->next_frame = NULL;
188
189 /* set up the return kernel frame if called from kernel_thread() */
190 if (regs != regs0) {
191 childregs--;
192 *childregs = *regs;
193 childregs->sp = (unsigned long) childregs0;
194 childregs->next_frame = childregs0;
195 childregs->gr15 = (unsigned long) task_thread_info(p);
196 childregs->gr29 = (unsigned long) p;
197 }
198
199 p->set_child_tid = p->clear_child_tid = NULL;
200
201 p->thread.frame = childregs;
202 p->thread.curr = p;
203 p->thread.sp = (unsigned long) childregs;
204 p->thread.fp = 0;
205 p->thread.lr = 0;
206 p->thread.pc = (unsigned long) ret_from_fork;
207 p->thread.frame0 = childregs0;
208
209 /* the new TLS pointer is passed in as arg #5 to sys_clone() */
210 if (clone_flags & CLONE_SETTLS)
211 childregs->gr29 = childregs->gr12;
212
213 save_user_regs(p->thread.user);
214
215 return 0;
216} /* end copy_thread() */
217
218/*
219 * sys_execve() executes a new program.
220 */
221asmlinkage int sys_execve(const char __user *name,
222 const char __user *const __user *argv,
223 const char __user *const __user *envp)
224{
225 int error;
226 char * filename;
227
228 filename = getname(name);
229 error = PTR_ERR(filename);
230 if (IS_ERR(filename))
231 return error;
232 error = do_execve(filename, argv, envp, __frame);
233 putname(filename);
234 return error;
235}
236
237unsigned long get_wchan(struct task_struct *p)
238{
239 struct pt_regs *regs0;
240 unsigned long fp, pc;
241 unsigned long stack_limit;
242 int count = 0;
243 if (!p || p == current || p->state == TASK_RUNNING)
244 return 0;
245
246 stack_limit = (unsigned long) (p + 1);
247 fp = p->thread.fp;
248 regs0 = p->thread.frame0;
249
250 do {
251 if (fp < stack_limit || fp >= (unsigned long) regs0 || fp & 3)
252 return 0;
253
254 pc = ((unsigned long *) fp)[2];
255
256 /* FIXME: This depends on the order of these functions. */
257 if (!in_sched_functions(pc))
258 return pc;
259
260 fp = *(unsigned long *) fp;
261 } while (count++ < 16);
262
263 return 0;
264}
265
266unsigned long thread_saved_pc(struct task_struct *tsk)
267{
268 /* Check whether the thread is blocked in resume() */
269 if (in_sched_functions(tsk->thread.pc))
270 return ((unsigned long *)tsk->thread.fp)[2];
271 else
272 return tsk->thread.pc;
273}
274
275int elf_check_arch(const struct elf32_hdr *hdr)
276{
277 unsigned long hsr0 = __get_HSR(0);
278 unsigned long psr = __get_PSR();
279
280 if (hdr->e_machine != EM_FRV)
281 return 0;
282
283 switch (hdr->e_flags & EF_FRV_GPR_MASK) {
284 case EF_FRV_GPR64:
285 if ((hsr0 & HSR0_GRN) == HSR0_GRN_32)
286 return 0;
287 case EF_FRV_GPR32:
288 case 0:
289 break;
290 default:
291 return 0;
292 }
293
294 switch (hdr->e_flags & EF_FRV_FPR_MASK) {
295 case EF_FRV_FPR64:
296 if ((hsr0 & HSR0_FRN) == HSR0_FRN_32)
297 return 0;
298 case EF_FRV_FPR32:
299 case EF_FRV_FPR_NONE:
300 case 0:
301 break;
302 default:
303 return 0;
304 }
305
306 if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD)
307 if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
308 PSR_IMPLE(psr) != PSR_IMPLE_FR451)
309 return 0;
310
311 switch (hdr->e_flags & EF_FRV_CPU_MASK) {
312 case EF_FRV_CPU_GENERIC:
313 break;
314 case EF_FRV_CPU_FR300:
315 case EF_FRV_CPU_SIMPLE:
316 case EF_FRV_CPU_TOMCAT:
317 default:
318 return 0;
319 case EF_FRV_CPU_FR400:
320 if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 &&
321 PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
322 PSR_IMPLE(psr) != PSR_IMPLE_FR451 &&
323 PSR_IMPLE(psr) != PSR_IMPLE_FR551)
324 return 0;
325 break;
326 case EF_FRV_CPU_FR450:
327 if (PSR_IMPLE(psr) != PSR_IMPLE_FR451)
328 return 0;
329 break;
330 case EF_FRV_CPU_FR500:
331 if (PSR_IMPLE(psr) != PSR_IMPLE_FR501)
332 return 0;
333 break;
334 case EF_FRV_CPU_FR550:
335 if (PSR_IMPLE(psr) != PSR_IMPLE_FR551)
336 return 0;
337 break;
338 }
339
340 return 1;
341}
342
343int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
344{
345 memcpy(fpregs,
346 ¤t->thread.user->f,
347 sizeof(current->thread.user->f));
348 return 1;
349}
1/* process.c: FRV specific parts of process handling
2 *
3 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * - Derived from arch/m68k/kernel/process.c
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#include <linux/module.h>
14#include <linux/errno.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/smp.h>
19#include <linux/stddef.h>
20#include <linux/unistd.h>
21#include <linux/ptrace.h>
22#include <linux/slab.h>
23#include <linux/user.h>
24#include <linux/elf.h>
25#include <linux/reboot.h>
26#include <linux/interrupt.h>
27#include <linux/pagemap.h>
28
29#include <asm/asm-offsets.h>
30#include <asm/uaccess.h>
31#include <asm/system.h>
32#include <asm/setup.h>
33#include <asm/pgtable.h>
34#include <asm/tlb.h>
35#include <asm/gdb-stub.h>
36#include <asm/mb-regs.h>
37
38#include "local.h"
39
40asmlinkage void ret_from_fork(void);
41
42#include <asm/pgalloc.h>
43
44void (*pm_power_off)(void);
45EXPORT_SYMBOL(pm_power_off);
46
47struct task_struct *alloc_task_struct_node(int node)
48{
49 struct task_struct *p = kmalloc_node(THREAD_SIZE, GFP_KERNEL, node);
50
51 if (p)
52 atomic_set((atomic_t *)(p+1), 1);
53 return p;
54}
55
56void free_task_struct(struct task_struct *p)
57{
58 if (atomic_dec_and_test((atomic_t *)(p+1)))
59 kfree(p);
60}
61
62static void core_sleep_idle(void)
63{
64#ifdef LED_DEBUG_SLEEP
65 /* Show that we're sleeping... */
66 __set_LEDS(0x55aa);
67#endif
68 frv_cpu_core_sleep();
69#ifdef LED_DEBUG_SLEEP
70 /* ... and that we woke up */
71 __set_LEDS(0);
72#endif
73 mb();
74}
75
76void (*idle)(void) = core_sleep_idle;
77
78/*
79 * The idle thread. There's no useful work to be
80 * done, so just try to conserve power and have a
81 * low exit latency (ie sit in a loop waiting for
82 * somebody to say that they'd like to reschedule)
83 */
84void cpu_idle(void)
85{
86 /* endless idle loop with no priority at all */
87 while (1) {
88 while (!need_resched()) {
89 check_pgt_cache();
90
91 if (!frv_dma_inprogress && idle)
92 idle();
93 }
94
95 preempt_enable_no_resched();
96 schedule();
97 preempt_disable();
98 }
99}
100
101void machine_restart(char * __unused)
102{
103 unsigned long reset_addr;
104#ifdef CONFIG_GDBSTUB
105 gdbstub_exit(0);
106#endif
107
108 if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551)
109 reset_addr = 0xfefff500;
110 else
111 reset_addr = 0xfeff0500;
112
113 /* Software reset. */
114 asm volatile(" dcef @(gr0,gr0),1 ! membar !"
115 " sti %1,@(%0,0) !"
116 " nop ! nop ! nop ! nop ! nop ! "
117 " nop ! nop ! nop ! nop ! nop ! "
118 " nop ! nop ! nop ! nop ! nop ! "
119 " nop ! nop ! nop ! nop ! nop ! "
120 : : "r" (reset_addr), "r" (1) );
121
122 for (;;)
123 ;
124}
125
126void machine_halt(void)
127{
128#ifdef CONFIG_GDBSTUB
129 gdbstub_exit(0);
130#endif
131
132 for (;;);
133}
134
135void machine_power_off(void)
136{
137#ifdef CONFIG_GDBSTUB
138 gdbstub_exit(0);
139#endif
140
141 for (;;);
142}
143
144void flush_thread(void)
145{
146 /* nothing */
147}
148
149inline unsigned long user_stack(const struct pt_regs *regs)
150{
151 while (regs->next_frame)
152 regs = regs->next_frame;
153 return user_mode(regs) ? regs->sp : 0;
154}
155
156asmlinkage int sys_fork(void)
157{
158#ifndef CONFIG_MMU
159 /* fork almost works, enough to trick you into looking elsewhere:-( */
160 return -EINVAL;
161#else
162 return do_fork(SIGCHLD, user_stack(__frame), __frame, 0, NULL, NULL);
163#endif
164}
165
166asmlinkage int sys_vfork(void)
167{
168 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, user_stack(__frame), __frame, 0,
169 NULL, NULL);
170}
171
172/*****************************************************************************/
173/*
174 * clone a process
175 * - tlsptr is retrieved by copy_thread()
176 */
177asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
178 int __user *parent_tidptr, int __user *child_tidptr,
179 int __user *tlsptr)
180{
181 if (!newsp)
182 newsp = user_stack(__frame);
183 return do_fork(clone_flags, newsp, __frame, 0, parent_tidptr, child_tidptr);
184} /* end sys_clone() */
185
186/*****************************************************************************/
187/*
188 * This gets called before we allocate a new thread and copy
189 * the current task into it.
190 */
191void prepare_to_copy(struct task_struct *tsk)
192{
193 //unlazy_fpu(tsk);
194} /* end prepare_to_copy() */
195
196/*****************************************************************************/
197/*
198 * set up the kernel stack and exception frames for a new process
199 */
200int copy_thread(unsigned long clone_flags,
201 unsigned long usp, unsigned long topstk,
202 struct task_struct *p, struct pt_regs *regs)
203{
204 struct pt_regs *childregs0, *childregs, *regs0;
205
206 regs0 = __kernel_frame0_ptr;
207 childregs0 = (struct pt_regs *)
208 (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
209 childregs = childregs0;
210
211 /* set up the userspace frame (the only place that the USP is stored) */
212 *childregs0 = *regs0;
213
214 childregs0->gr8 = 0;
215 childregs0->sp = usp;
216 childregs0->next_frame = NULL;
217
218 /* set up the return kernel frame if called from kernel_thread() */
219 if (regs != regs0) {
220 childregs--;
221 *childregs = *regs;
222 childregs->sp = (unsigned long) childregs0;
223 childregs->next_frame = childregs0;
224 childregs->gr15 = (unsigned long) task_thread_info(p);
225 childregs->gr29 = (unsigned long) p;
226 }
227
228 p->set_child_tid = p->clear_child_tid = NULL;
229
230 p->thread.frame = childregs;
231 p->thread.curr = p;
232 p->thread.sp = (unsigned long) childregs;
233 p->thread.fp = 0;
234 p->thread.lr = 0;
235 p->thread.pc = (unsigned long) ret_from_fork;
236 p->thread.frame0 = childregs0;
237
238 /* the new TLS pointer is passed in as arg #5 to sys_clone() */
239 if (clone_flags & CLONE_SETTLS)
240 childregs->gr29 = childregs->gr12;
241
242 save_user_regs(p->thread.user);
243
244 return 0;
245} /* end copy_thread() */
246
247/*
248 * sys_execve() executes a new program.
249 */
250asmlinkage int sys_execve(const char __user *name,
251 const char __user *const __user *argv,
252 const char __user *const __user *envp)
253{
254 int error;
255 char * filename;
256
257 filename = getname(name);
258 error = PTR_ERR(filename);
259 if (IS_ERR(filename))
260 return error;
261 error = do_execve(filename, argv, envp, __frame);
262 putname(filename);
263 return error;
264}
265
266unsigned long get_wchan(struct task_struct *p)
267{
268 struct pt_regs *regs0;
269 unsigned long fp, pc;
270 unsigned long stack_limit;
271 int count = 0;
272 if (!p || p == current || p->state == TASK_RUNNING)
273 return 0;
274
275 stack_limit = (unsigned long) (p + 1);
276 fp = p->thread.fp;
277 regs0 = p->thread.frame0;
278
279 do {
280 if (fp < stack_limit || fp >= (unsigned long) regs0 || fp & 3)
281 return 0;
282
283 pc = ((unsigned long *) fp)[2];
284
285 /* FIXME: This depends on the order of these functions. */
286 if (!in_sched_functions(pc))
287 return pc;
288
289 fp = *(unsigned long *) fp;
290 } while (count++ < 16);
291
292 return 0;
293}
294
295unsigned long thread_saved_pc(struct task_struct *tsk)
296{
297 /* Check whether the thread is blocked in resume() */
298 if (in_sched_functions(tsk->thread.pc))
299 return ((unsigned long *)tsk->thread.fp)[2];
300 else
301 return tsk->thread.pc;
302}
303
304int elf_check_arch(const struct elf32_hdr *hdr)
305{
306 unsigned long hsr0 = __get_HSR(0);
307 unsigned long psr = __get_PSR();
308
309 if (hdr->e_machine != EM_FRV)
310 return 0;
311
312 switch (hdr->e_flags & EF_FRV_GPR_MASK) {
313 case EF_FRV_GPR64:
314 if ((hsr0 & HSR0_GRN) == HSR0_GRN_32)
315 return 0;
316 case EF_FRV_GPR32:
317 case 0:
318 break;
319 default:
320 return 0;
321 }
322
323 switch (hdr->e_flags & EF_FRV_FPR_MASK) {
324 case EF_FRV_FPR64:
325 if ((hsr0 & HSR0_FRN) == HSR0_FRN_32)
326 return 0;
327 case EF_FRV_FPR32:
328 case EF_FRV_FPR_NONE:
329 case 0:
330 break;
331 default:
332 return 0;
333 }
334
335 if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD)
336 if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
337 PSR_IMPLE(psr) != PSR_IMPLE_FR451)
338 return 0;
339
340 switch (hdr->e_flags & EF_FRV_CPU_MASK) {
341 case EF_FRV_CPU_GENERIC:
342 break;
343 case EF_FRV_CPU_FR300:
344 case EF_FRV_CPU_SIMPLE:
345 case EF_FRV_CPU_TOMCAT:
346 default:
347 return 0;
348 case EF_FRV_CPU_FR400:
349 if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 &&
350 PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
351 PSR_IMPLE(psr) != PSR_IMPLE_FR451 &&
352 PSR_IMPLE(psr) != PSR_IMPLE_FR551)
353 return 0;
354 break;
355 case EF_FRV_CPU_FR450:
356 if (PSR_IMPLE(psr) != PSR_IMPLE_FR451)
357 return 0;
358 break;
359 case EF_FRV_CPU_FR500:
360 if (PSR_IMPLE(psr) != PSR_IMPLE_FR501)
361 return 0;
362 break;
363 case EF_FRV_CPU_FR550:
364 if (PSR_IMPLE(psr) != PSR_IMPLE_FR551)
365 return 0;
366 break;
367 }
368
369 return 1;
370}
371
372int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
373{
374 memcpy(fpregs,
375 ¤t->thread.user->f,
376 sizeof(current->thread.user->f));
377 return 1;
378}