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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#include <linux/rcupdate.h>
29
30#include <asm/asm-offsets.h>
31#include <asm/uaccess.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);
41asmlinkage void ret_from_kernel_thread(void);
42
43#include <asm/pgalloc.h>
44
45void (*pm_power_off)(void);
46EXPORT_SYMBOL(pm_power_off);
47
48static void core_sleep_idle(void)
49{
50#ifdef LED_DEBUG_SLEEP
51
52 __set_LEDS(0x55aa);
53#endif
54 frv_cpu_core_sleep();
55#ifdef LED_DEBUG_SLEEP
56
57 __set_LEDS(0);
58#endif
59 mb();
60}
61
62void arch_cpu_idle(void)
63{
64 if (!frv_dma_inprogress)
65 core_sleep_idle();
66 else
67 local_irq_enable();
68}
69
70void machine_restart(char * __unused)
71{
72 unsigned long reset_addr;
73#ifdef CONFIG_GDBSTUB
74 gdbstub_exit(0);
75#endif
76
77 if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551)
78 reset_addr = 0xfefff500;
79 else
80 reset_addr = 0xfeff0500;
81
82
83 asm volatile(" dcef @(gr0,gr0),1 ! membar !"
84 " sti %1,@(%0,0) !"
85 " nop ! nop ! nop ! nop ! nop ! "
86 " nop ! nop ! nop ! nop ! nop ! "
87 " nop ! nop ! nop ! nop ! nop ! "
88 " nop ! nop ! nop ! nop ! nop ! "
89 : : "r" (reset_addr), "r" (1) );
90
91 for (;;)
92 ;
93}
94
95void machine_halt(void)
96{
97#ifdef CONFIG_GDBSTUB
98 gdbstub_exit(0);
99#endif
100
101 for (;;);
102}
103
104void machine_power_off(void)
105{
106#ifdef CONFIG_GDBSTUB
107 gdbstub_exit(0);
108#endif
109
110 for (;;);
111}
112
113void flush_thread(void)
114{
115
116}
117
118inline unsigned long user_stack(const struct pt_regs *regs)
119{
120 while (regs->next_frame)
121 regs = regs->next_frame;
122 return user_mode(regs) ? regs->sp : 0;
123}
124
125
126
127
128int copy_thread(unsigned long clone_flags,
129 unsigned long usp, unsigned long arg,
130 struct task_struct *p)
131{
132 struct pt_regs *childregs;
133
134 childregs = (struct pt_regs *)
135 (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
136
137
138 *childregs = *current_pt_regs();
139
140 p->thread.frame = childregs;
141 p->thread.curr = p;
142 p->thread.sp = (unsigned long) childregs;
143 p->thread.fp = 0;
144 p->thread.lr = 0;
145 p->thread.frame0 = childregs;
146
147 if (unlikely(p->flags & PF_KTHREAD)) {
148 childregs->gr9 = usp;
149 childregs->gr8 = arg;
150 p->thread.pc = (unsigned long) ret_from_kernel_thread;
151 save_user_regs(p->thread.user);
152 return 0;
153 }
154 if (usp)
155 childregs->sp = usp;
156 childregs->next_frame = NULL;
157
158 p->thread.pc = (unsigned long) ret_from_fork;
159
160
161 if (clone_flags & CLONE_SETTLS)
162 childregs->gr29 = childregs->gr12;
163
164 save_user_regs(p->thread.user);
165
166 return 0;
167}
168
169unsigned long get_wchan(struct task_struct *p)
170{
171 struct pt_regs *regs0;
172 unsigned long fp, pc;
173 unsigned long stack_limit;
174 int count = 0;
175 if (!p || p == current || p->state == TASK_RUNNING)
176 return 0;
177
178 stack_limit = (unsigned long) (p + 1);
179 fp = p->thread.fp;
180 regs0 = p->thread.frame0;
181
182 do {
183 if (fp < stack_limit || fp >= (unsigned long) regs0 || fp & 3)
184 return 0;
185
186 pc = ((unsigned long *) fp)[2];
187
188
189 if (!in_sched_functions(pc))
190 return pc;
191
192 fp = *(unsigned long *) fp;
193 } while (count++ < 16);
194
195 return 0;
196}
197
198unsigned long thread_saved_pc(struct task_struct *tsk)
199{
200
201 if (in_sched_functions(tsk->thread.pc))
202 return ((unsigned long *)tsk->thread.fp)[2];
203 else
204 return tsk->thread.pc;
205}
206
207int elf_check_arch(const struct elf32_hdr *hdr)
208{
209 unsigned long hsr0 = __get_HSR(0);
210 unsigned long psr = __get_PSR();
211
212 if (hdr->e_machine != EM_FRV)
213 return 0;
214
215 switch (hdr->e_flags & EF_FRV_GPR_MASK) {
216 case EF_FRV_GPR64:
217 if ((hsr0 & HSR0_GRN) == HSR0_GRN_32)
218 return 0;
219 case EF_FRV_GPR32:
220 case 0:
221 break;
222 default:
223 return 0;
224 }
225
226 switch (hdr->e_flags & EF_FRV_FPR_MASK) {
227 case EF_FRV_FPR64:
228 if ((hsr0 & HSR0_FRN) == HSR0_FRN_32)
229 return 0;
230 case EF_FRV_FPR32:
231 case EF_FRV_FPR_NONE:
232 case 0:
233 break;
234 default:
235 return 0;
236 }
237
238 if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD)
239 if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
240 PSR_IMPLE(psr) != PSR_IMPLE_FR451)
241 return 0;
242
243 switch (hdr->e_flags & EF_FRV_CPU_MASK) {
244 case EF_FRV_CPU_GENERIC:
245 break;
246 case EF_FRV_CPU_FR300:
247 case EF_FRV_CPU_SIMPLE:
248 case EF_FRV_CPU_TOMCAT:
249 default:
250 return 0;
251 case EF_FRV_CPU_FR400:
252 if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 &&
253 PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
254 PSR_IMPLE(psr) != PSR_IMPLE_FR451 &&
255 PSR_IMPLE(psr) != PSR_IMPLE_FR551)
256 return 0;
257 break;
258 case EF_FRV_CPU_FR450:
259 if (PSR_IMPLE(psr) != PSR_IMPLE_FR451)
260 return 0;
261 break;
262 case EF_FRV_CPU_FR500:
263 if (PSR_IMPLE(psr) != PSR_IMPLE_FR501)
264 return 0;
265 break;
266 case EF_FRV_CPU_FR550:
267 if (PSR_IMPLE(psr) != PSR_IMPLE_FR551)
268 return 0;
269 break;
270 }
271
272 return 1;
273}
274
275int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
276{
277 memcpy(fpregs,
278 ¤t->thread.user->f,
279 sizeof(current->thread.user->f));
280 return 1;
281}
282
