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