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1da177e4 LT |
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 | ||
9dec17eb | 13 | #include <linux/module.h> |
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/sched.h> | |
b17b0153 | 16 | #include <linux/sched/debug.h> |
29930025 | 17 | #include <linux/sched/task.h> |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/mm.h> | |
20 | #include <linux/smp.h> | |
1da177e4 LT |
21 | #include <linux/stddef.h> |
22 | #include <linux/unistd.h> | |
23 | #include <linux/ptrace.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/user.h> | |
26 | #include <linux/elf.h> | |
27 | #include <linux/reboot.h> | |
28 | #include <linux/interrupt.h> | |
8defab33 | 29 | #include <linux/pagemap.h> |
41d8fe5b | 30 | #include <linux/rcupdate.h> |
1da177e4 | 31 | |
84e8cd6d | 32 | #include <asm/asm-offsets.h> |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | #include <asm/setup.h> |
35 | #include <asm/pgtable.h> | |
8defab33 | 36 | #include <asm/tlb.h> |
1da177e4 LT |
37 | #include <asm/gdb-stub.h> |
38 | #include <asm/mb-regs.h> | |
39 | ||
40 | #include "local.h" | |
41 | ||
42 | asmlinkage void ret_from_fork(void); | |
02ce496f | 43 | asmlinkage void ret_from_kernel_thread(void); |
1da177e4 LT |
44 | |
45 | #include <asm/pgalloc.h> | |
46 | ||
9dec17eb DH |
47 | void (*pm_power_off)(void); |
48 | EXPORT_SYMBOL(pm_power_off); | |
49 | ||
1da177e4 LT |
50 | static void core_sleep_idle(void) |
51 | { | |
52 | #ifdef LED_DEBUG_SLEEP | |
53 | /* Show that we're sleeping... */ | |
54 | __set_LEDS(0x55aa); | |
55 | #endif | |
56 | frv_cpu_core_sleep(); | |
57 | #ifdef LED_DEBUG_SLEEP | |
58 | /* ... and that we woke up */ | |
59 | __set_LEDS(0); | |
60 | #endif | |
61 | mb(); | |
62 | } | |
63 | ||
ccf8e78f | 64 | void arch_cpu_idle(void) |
1da177e4 | 65 | { |
ccf8e78f TG |
66 | if (!frv_dma_inprogress) |
67 | core_sleep_idle(); | |
68 | else | |
69 | local_irq_enable(); | |
1da177e4 LT |
70 | } |
71 | ||
72 | void machine_restart(char * __unused) | |
73 | { | |
74 | unsigned long reset_addr; | |
75 | #ifdef CONFIG_GDBSTUB | |
76 | gdbstub_exit(0); | |
77 | #endif | |
78 | ||
79 | if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551) | |
80 | reset_addr = 0xfefff500; | |
81 | else | |
82 | reset_addr = 0xfeff0500; | |
83 | ||
84 | /* Software reset. */ | |
85 | asm volatile(" dcef @(gr0,gr0),1 ! membar !" | |
86 | " sti %1,@(%0,0) !" | |
87 | " nop ! nop ! nop ! nop ! nop ! " | |
88 | " nop ! nop ! nop ! nop ! nop ! " | |
89 | " nop ! nop ! nop ! nop ! nop ! " | |
90 | " nop ! nop ! nop ! nop ! nop ! " | |
91 | : : "r" (reset_addr), "r" (1) ); | |
92 | ||
93 | for (;;) | |
94 | ; | |
95 | } | |
96 | ||
97 | void machine_halt(void) | |
98 | { | |
99 | #ifdef CONFIG_GDBSTUB | |
100 | gdbstub_exit(0); | |
101 | #endif | |
102 | ||
103 | for (;;); | |
104 | } | |
105 | ||
106 | void machine_power_off(void) | |
107 | { | |
108 | #ifdef CONFIG_GDBSTUB | |
109 | gdbstub_exit(0); | |
110 | #endif | |
111 | ||
112 | for (;;); | |
113 | } | |
114 | ||
115 | void flush_thread(void) | |
116 | { | |
adc400f6 | 117 | /* nothing */ |
1da177e4 LT |
118 | } |
119 | ||
120 | inline unsigned long user_stack(const struct pt_regs *regs) | |
121 | { | |
122 | while (regs->next_frame) | |
123 | regs = regs->next_frame; | |
124 | return user_mode(regs) ? regs->sp : 0; | |
125 | } | |
126 | ||
1da177e4 LT |
127 | /* |
128 | * set up the kernel stack and exception frames for a new process | |
129 | */ | |
6f2c55b8 | 130 | int copy_thread(unsigned long clone_flags, |
49ed3398 | 131 | unsigned long usp, unsigned long arg, |
afa86fc4 | 132 | struct task_struct *p) |
1da177e4 | 133 | { |
02ce496f | 134 | struct pt_regs *childregs; |
1da177e4 | 135 | |
02ce496f | 136 | childregs = (struct pt_regs *) |
84e8cd6d | 137 | (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE); |
1da177e4 | 138 | |
e7aa51b2 | 139 | /* set up the userspace frame (the only place that the USP is stored) */ |
b9763ce3 | 140 | *childregs = *current_pt_regs(); |
1da177e4 LT |
141 | |
142 | p->thread.frame = childregs; | |
143 | p->thread.curr = p; | |
144 | p->thread.sp = (unsigned long) childregs; | |
145 | p->thread.fp = 0; | |
146 | p->thread.lr = 0; | |
02ce496f | 147 | p->thread.frame0 = childregs; |
1da177e4 | 148 | |
b9763ce3 | 149 | if (unlikely(p->flags & PF_KTHREAD)) { |
49ed3398 AV |
150 | childregs->gr9 = usp; /* function */ |
151 | childregs->gr8 = arg; | |
49ed3398 AV |
152 | p->thread.pc = (unsigned long) ret_from_kernel_thread; |
153 | save_user_regs(p->thread.user); | |
154 | return 0; | |
155 | } | |
b9763ce3 AV |
156 | if (usp) |
157 | childregs->sp = usp; | |
49ed3398 AV |
158 | childregs->next_frame = NULL; |
159 | ||
160 | p->thread.pc = (unsigned long) ret_from_fork; | |
1da177e4 LT |
161 | |
162 | /* the new TLS pointer is passed in as arg #5 to sys_clone() */ | |
163 | if (clone_flags & CLONE_SETTLS) | |
164 | childregs->gr29 = childregs->gr12; | |
165 | ||
166 | save_user_regs(p->thread.user); | |
167 | ||
168 | return 0; | |
169 | } /* end copy_thread() */ | |
170 | ||
1da177e4 LT |
171 | unsigned long get_wchan(struct task_struct *p) |
172 | { | |
173 | struct pt_regs *regs0; | |
174 | unsigned long fp, pc; | |
175 | unsigned long stack_limit; | |
176 | int count = 0; | |
177 | if (!p || p == current || p->state == TASK_RUNNING) | |
178 | return 0; | |
179 | ||
180 | stack_limit = (unsigned long) (p + 1); | |
181 | fp = p->thread.fp; | |
182 | regs0 = p->thread.frame0; | |
183 | ||
184 | do { | |
185 | if (fp < stack_limit || fp >= (unsigned long) regs0 || fp & 3) | |
186 | return 0; | |
187 | ||
188 | pc = ((unsigned long *) fp)[2]; | |
189 | ||
190 | /* FIXME: This depends on the order of these functions. */ | |
191 | if (!in_sched_functions(pc)) | |
192 | return pc; | |
193 | ||
194 | fp = *(unsigned long *) fp; | |
195 | } while (count++ < 16); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
201 | { | |
202 | /* Check whether the thread is blocked in resume() */ | |
203 | if (in_sched_functions(tsk->thread.pc)) | |
204 | return ((unsigned long *)tsk->thread.fp)[2]; | |
205 | else | |
206 | return tsk->thread.pc; | |
207 | } | |
208 | ||
209 | int elf_check_arch(const struct elf32_hdr *hdr) | |
210 | { | |
211 | unsigned long hsr0 = __get_HSR(0); | |
212 | unsigned long psr = __get_PSR(); | |
213 | ||
214 | if (hdr->e_machine != EM_FRV) | |
215 | return 0; | |
216 | ||
217 | switch (hdr->e_flags & EF_FRV_GPR_MASK) { | |
218 | case EF_FRV_GPR64: | |
219 | if ((hsr0 & HSR0_GRN) == HSR0_GRN_32) | |
220 | return 0; | |
221 | case EF_FRV_GPR32: | |
222 | case 0: | |
223 | break; | |
224 | default: | |
225 | return 0; | |
226 | } | |
227 | ||
228 | switch (hdr->e_flags & EF_FRV_FPR_MASK) { | |
229 | case EF_FRV_FPR64: | |
230 | if ((hsr0 & HSR0_FRN) == HSR0_FRN_32) | |
231 | return 0; | |
232 | case EF_FRV_FPR32: | |
233 | case EF_FRV_FPR_NONE: | |
234 | case 0: | |
235 | break; | |
236 | default: | |
237 | return 0; | |
238 | } | |
239 | ||
240 | if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD) | |
241 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 && | |
242 | PSR_IMPLE(psr) != PSR_IMPLE_FR451) | |
243 | return 0; | |
244 | ||
245 | switch (hdr->e_flags & EF_FRV_CPU_MASK) { | |
246 | case EF_FRV_CPU_GENERIC: | |
247 | break; | |
248 | case EF_FRV_CPU_FR300: | |
249 | case EF_FRV_CPU_SIMPLE: | |
250 | case EF_FRV_CPU_TOMCAT: | |
251 | default: | |
252 | return 0; | |
253 | case EF_FRV_CPU_FR400: | |
254 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 && | |
255 | PSR_IMPLE(psr) != PSR_IMPLE_FR405 && | |
256 | PSR_IMPLE(psr) != PSR_IMPLE_FR451 && | |
257 | PSR_IMPLE(psr) != PSR_IMPLE_FR551) | |
258 | return 0; | |
259 | break; | |
260 | case EF_FRV_CPU_FR450: | |
261 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR451) | |
262 | return 0; | |
263 | break; | |
264 | case EF_FRV_CPU_FR500: | |
265 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR501) | |
266 | return 0; | |
267 | break; | |
268 | case EF_FRV_CPU_FR550: | |
269 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR551) | |
270 | return 0; | |
271 | break; | |
272 | } | |
273 | ||
274 | return 1; | |
275 | } | |
6d8c4e3b DH |
276 | |
277 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) | |
278 | { | |
279 | memcpy(fpregs, | |
280 | ¤t->thread.user->f, | |
281 | sizeof(current->thread.user->f)); | |
282 | return 1; | |
283 | } |