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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> |
68db0cf1 | 18 | #include <linux/sched/task_stack.h> |
1da177e4 LT |
19 | #include <linux/kernel.h> |
20 | #include <linux/mm.h> | |
21 | #include <linux/smp.h> | |
1da177e4 LT |
22 | #include <linux/stddef.h> |
23 | #include <linux/unistd.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/user.h> | |
27 | #include <linux/elf.h> | |
28 | #include <linux/reboot.h> | |
29 | #include <linux/interrupt.h> | |
8defab33 | 30 | #include <linux/pagemap.h> |
41d8fe5b | 31 | #include <linux/rcupdate.h> |
1da177e4 | 32 | |
84e8cd6d | 33 | #include <asm/asm-offsets.h> |
7c0f6ba6 | 34 | #include <linux/uaccess.h> |
1da177e4 LT |
35 | #include <asm/setup.h> |
36 | #include <asm/pgtable.h> | |
8defab33 | 37 | #include <asm/tlb.h> |
1da177e4 LT |
38 | #include <asm/gdb-stub.h> |
39 | #include <asm/mb-regs.h> | |
40 | ||
41 | #include "local.h" | |
42 | ||
43 | asmlinkage void ret_from_fork(void); | |
02ce496f | 44 | asmlinkage void ret_from_kernel_thread(void); |
1da177e4 LT |
45 | |
46 | #include <asm/pgalloc.h> | |
47 | ||
9dec17eb DH |
48 | void (*pm_power_off)(void); |
49 | EXPORT_SYMBOL(pm_power_off); | |
50 | ||
1da177e4 LT |
51 | static void core_sleep_idle(void) |
52 | { | |
53 | #ifdef LED_DEBUG_SLEEP | |
54 | /* Show that we're sleeping... */ | |
55 | __set_LEDS(0x55aa); | |
56 | #endif | |
57 | frv_cpu_core_sleep(); | |
58 | #ifdef LED_DEBUG_SLEEP | |
59 | /* ... and that we woke up */ | |
60 | __set_LEDS(0); | |
61 | #endif | |
62 | mb(); | |
63 | } | |
64 | ||
ccf8e78f | 65 | void arch_cpu_idle(void) |
1da177e4 | 66 | { |
ccf8e78f TG |
67 | if (!frv_dma_inprogress) |
68 | core_sleep_idle(); | |
69 | else | |
70 | local_irq_enable(); | |
1da177e4 LT |
71 | } |
72 | ||
73 | void machine_restart(char * __unused) | |
74 | { | |
75 | unsigned long reset_addr; | |
76 | #ifdef CONFIG_GDBSTUB | |
77 | gdbstub_exit(0); | |
78 | #endif | |
79 | ||
80 | if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551) | |
81 | reset_addr = 0xfefff500; | |
82 | else | |
83 | reset_addr = 0xfeff0500; | |
84 | ||
85 | /* Software reset. */ | |
86 | asm volatile(" dcef @(gr0,gr0),1 ! membar !" | |
87 | " sti %1,@(%0,0) !" | |
88 | " nop ! nop ! nop ! nop ! nop ! " | |
89 | " nop ! nop ! nop ! nop ! nop ! " | |
90 | " nop ! nop ! nop ! nop ! nop ! " | |
91 | " nop ! nop ! nop ! nop ! nop ! " | |
92 | : : "r" (reset_addr), "r" (1) ); | |
93 | ||
94 | for (;;) | |
95 | ; | |
96 | } | |
97 | ||
98 | void machine_halt(void) | |
99 | { | |
100 | #ifdef CONFIG_GDBSTUB | |
101 | gdbstub_exit(0); | |
102 | #endif | |
103 | ||
104 | for (;;); | |
105 | } | |
106 | ||
107 | void machine_power_off(void) | |
108 | { | |
109 | #ifdef CONFIG_GDBSTUB | |
110 | gdbstub_exit(0); | |
111 | #endif | |
112 | ||
113 | for (;;); | |
114 | } | |
115 | ||
116 | void flush_thread(void) | |
117 | { | |
adc400f6 | 118 | /* nothing */ |
1da177e4 LT |
119 | } |
120 | ||
121 | inline unsigned long user_stack(const struct pt_regs *regs) | |
122 | { | |
123 | while (regs->next_frame) | |
124 | regs = regs->next_frame; | |
125 | return user_mode(regs) ? regs->sp : 0; | |
126 | } | |
127 | ||
1da177e4 LT |
128 | /* |
129 | * set up the kernel stack and exception frames for a new process | |
130 | */ | |
6f2c55b8 | 131 | int copy_thread(unsigned long clone_flags, |
49ed3398 | 132 | unsigned long usp, unsigned long arg, |
afa86fc4 | 133 | struct task_struct *p) |
1da177e4 | 134 | { |
02ce496f | 135 | struct pt_regs *childregs; |
1da177e4 | 136 | |
02ce496f | 137 | childregs = (struct pt_regs *) |
84e8cd6d | 138 | (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE); |
1da177e4 | 139 | |
e7aa51b2 | 140 | /* set up the userspace frame (the only place that the USP is stored) */ |
b9763ce3 | 141 | *childregs = *current_pt_regs(); |
1da177e4 LT |
142 | |
143 | p->thread.frame = childregs; | |
144 | p->thread.curr = p; | |
145 | p->thread.sp = (unsigned long) childregs; | |
146 | p->thread.fp = 0; | |
147 | p->thread.lr = 0; | |
02ce496f | 148 | p->thread.frame0 = childregs; |
1da177e4 | 149 | |
b9763ce3 | 150 | if (unlikely(p->flags & PF_KTHREAD)) { |
49ed3398 AV |
151 | childregs->gr9 = usp; /* function */ |
152 | childregs->gr8 = arg; | |
49ed3398 AV |
153 | p->thread.pc = (unsigned long) ret_from_kernel_thread; |
154 | save_user_regs(p->thread.user); | |
155 | return 0; | |
156 | } | |
b9763ce3 AV |
157 | if (usp) |
158 | childregs->sp = usp; | |
49ed3398 AV |
159 | childregs->next_frame = NULL; |
160 | ||
161 | p->thread.pc = (unsigned long) ret_from_fork; | |
1da177e4 LT |
162 | |
163 | /* the new TLS pointer is passed in as arg #5 to sys_clone() */ | |
164 | if (clone_flags & CLONE_SETTLS) | |
165 | childregs->gr29 = childregs->gr12; | |
166 | ||
167 | save_user_regs(p->thread.user); | |
168 | ||
169 | return 0; | |
170 | } /* end copy_thread() */ | |
171 | ||
1da177e4 LT |
172 | unsigned long get_wchan(struct task_struct *p) |
173 | { | |
174 | struct pt_regs *regs0; | |
175 | unsigned long fp, pc; | |
176 | unsigned long stack_limit; | |
177 | int count = 0; | |
178 | if (!p || p == current || p->state == TASK_RUNNING) | |
179 | return 0; | |
180 | ||
181 | stack_limit = (unsigned long) (p + 1); | |
182 | fp = p->thread.fp; | |
183 | regs0 = p->thread.frame0; | |
184 | ||
185 | do { | |
186 | if (fp < stack_limit || fp >= (unsigned long) regs0 || fp & 3) | |
187 | return 0; | |
188 | ||
189 | pc = ((unsigned long *) fp)[2]; | |
190 | ||
191 | /* FIXME: This depends on the order of these functions. */ | |
192 | if (!in_sched_functions(pc)) | |
193 | return pc; | |
194 | ||
195 | fp = *(unsigned long *) fp; | |
196 | } while (count++ < 16); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
202 | { | |
203 | /* Check whether the thread is blocked in resume() */ | |
204 | if (in_sched_functions(tsk->thread.pc)) | |
205 | return ((unsigned long *)tsk->thread.fp)[2]; | |
206 | else | |
207 | return tsk->thread.pc; | |
208 | } | |
209 | ||
210 | int elf_check_arch(const struct elf32_hdr *hdr) | |
211 | { | |
212 | unsigned long hsr0 = __get_HSR(0); | |
213 | unsigned long psr = __get_PSR(); | |
214 | ||
215 | if (hdr->e_machine != EM_FRV) | |
216 | return 0; | |
217 | ||
218 | switch (hdr->e_flags & EF_FRV_GPR_MASK) { | |
219 | case EF_FRV_GPR64: | |
220 | if ((hsr0 & HSR0_GRN) == HSR0_GRN_32) | |
221 | return 0; | |
222 | case EF_FRV_GPR32: | |
223 | case 0: | |
224 | break; | |
225 | default: | |
226 | return 0; | |
227 | } | |
228 | ||
229 | switch (hdr->e_flags & EF_FRV_FPR_MASK) { | |
230 | case EF_FRV_FPR64: | |
231 | if ((hsr0 & HSR0_FRN) == HSR0_FRN_32) | |
232 | return 0; | |
233 | case EF_FRV_FPR32: | |
234 | case EF_FRV_FPR_NONE: | |
235 | case 0: | |
236 | break; | |
237 | default: | |
238 | return 0; | |
239 | } | |
240 | ||
241 | if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD) | |
242 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 && | |
243 | PSR_IMPLE(psr) != PSR_IMPLE_FR451) | |
244 | return 0; | |
245 | ||
246 | switch (hdr->e_flags & EF_FRV_CPU_MASK) { | |
247 | case EF_FRV_CPU_GENERIC: | |
248 | break; | |
249 | case EF_FRV_CPU_FR300: | |
250 | case EF_FRV_CPU_SIMPLE: | |
251 | case EF_FRV_CPU_TOMCAT: | |
252 | default: | |
253 | return 0; | |
254 | case EF_FRV_CPU_FR400: | |
255 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 && | |
256 | PSR_IMPLE(psr) != PSR_IMPLE_FR405 && | |
257 | PSR_IMPLE(psr) != PSR_IMPLE_FR451 && | |
258 | PSR_IMPLE(psr) != PSR_IMPLE_FR551) | |
259 | return 0; | |
260 | break; | |
261 | case EF_FRV_CPU_FR450: | |
262 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR451) | |
263 | return 0; | |
264 | break; | |
265 | case EF_FRV_CPU_FR500: | |
266 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR501) | |
267 | return 0; | |
268 | break; | |
269 | case EF_FRV_CPU_FR550: | |
270 | if (PSR_IMPLE(psr) != PSR_IMPLE_FR551) | |
271 | return 0; | |
272 | break; | |
273 | } | |
274 | ||
275 | return 1; | |
276 | } | |
6d8c4e3b DH |
277 | |
278 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) | |
279 | { | |
280 | memcpy(fpregs, | |
281 | ¤t->thread.user->f, | |
282 | sizeof(current->thread.user->f)); | |
283 | return 1; | |
284 | } |