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b920de1b DH |
1 | /* MN10300 Process handling code |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/sched.h> | |
b17b0153 | 14 | #include <linux/sched/debug.h> |
29930025 | 15 | #include <linux/sched/task.h> |
b920de1b DH |
16 | #include <linux/kernel.h> |
17 | #include <linux/mm.h> | |
18 | #include <linux/smp.h> | |
b920de1b DH |
19 | #include <linux/stddef.h> |
20 | #include <linux/unistd.h> | |
21 | #include <linux/ptrace.h> | |
b920de1b | 22 | #include <linux/user.h> |
b920de1b DH |
23 | #include <linux/interrupt.h> |
24 | #include <linux/delay.h> | |
25 | #include <linux/reboot.h> | |
26 | #include <linux/percpu.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/fs.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
5b0753a9 | 30 | #include <linux/rcupdate.h> |
7c0f6ba6 | 31 | #include <linux/uaccess.h> |
b920de1b | 32 | #include <asm/pgtable.h> |
b920de1b DH |
33 | #include <asm/io.h> |
34 | #include <asm/processor.h> | |
35 | #include <asm/mmu_context.h> | |
36 | #include <asm/fpu.h> | |
37 | #include <asm/reset-regs.h> | |
38 | #include <asm/gdb-stub.h> | |
39 | #include "internal.h" | |
40 | ||
b920de1b DH |
41 | /* |
42 | * return saved PC of a blocked thread. | |
43 | */ | |
44 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
45 | { | |
46 | return ((unsigned long *) tsk->thread.sp)[3]; | |
47 | } | |
48 | ||
49 | /* | |
50 | * power off function, if any | |
51 | */ | |
52 | void (*pm_power_off)(void); | |
53 | EXPORT_SYMBOL(pm_power_off); | |
54 | ||
368dd5ac AT |
55 | /* |
56 | * On SMP it's slightly faster (but much more power-consuming!) | |
57 | * to poll the ->work.need_resched flag instead of waiting for the | |
58 | * cross-CPU IPI to arrive. Use this option with caution. | |
af695cd9 TG |
59 | * |
60 | * tglx: No idea why this depends on HOTPLUG_CPU !?! | |
368dd5ac | 61 | */ |
af695cd9 TG |
62 | #if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU) |
63 | void arch_cpu_idle(void) | |
b920de1b | 64 | { |
af695cd9 | 65 | safe_halt(); |
b920de1b | 66 | } |
af695cd9 | 67 | #endif |
b920de1b DH |
68 | |
69 | void release_segments(struct mm_struct *mm) | |
70 | { | |
71 | } | |
72 | ||
73 | void machine_restart(char *cmd) | |
74 | { | |
044264bb | 75 | #ifdef CONFIG_KERNEL_DEBUGGER |
b920de1b DH |
76 | gdbstub_exit(0); |
77 | #endif | |
78 | ||
79 | #ifdef mn10300_unit_hard_reset | |
80 | mn10300_unit_hard_reset(); | |
81 | #else | |
82 | mn10300_proc_hard_reset(); | |
83 | #endif | |
84 | } | |
85 | ||
86 | void machine_halt(void) | |
87 | { | |
044264bb | 88 | #ifdef CONFIG_KERNEL_DEBUGGER |
b920de1b DH |
89 | gdbstub_exit(0); |
90 | #endif | |
91 | } | |
92 | ||
93 | void machine_power_off(void) | |
94 | { | |
044264bb | 95 | #ifdef CONFIG_KERNEL_DEBUGGER |
b920de1b DH |
96 | gdbstub_exit(0); |
97 | #endif | |
98 | } | |
99 | ||
100 | void show_regs(struct pt_regs *regs) | |
101 | { | |
a43cb95d | 102 | show_regs_print_info(KERN_DEFAULT); |
b920de1b DH |
103 | } |
104 | ||
b920de1b DH |
105 | /* |
106 | * free current thread data structures etc.. | |
107 | */ | |
e6464694 | 108 | void exit_thread(struct task_struct *tsk) |
b920de1b | 109 | { |
e6464694 | 110 | exit_fpu(tsk); |
b920de1b DH |
111 | } |
112 | ||
113 | void flush_thread(void) | |
114 | { | |
115 | flush_fpu(); | |
116 | } | |
117 | ||
118 | void release_thread(struct task_struct *dead_task) | |
119 | { | |
120 | } | |
121 | ||
122 | /* | |
123 | * we do not have to muck with descriptors here, that is | |
124 | * done in switch_mm() as needed. | |
125 | */ | |
126 | void copy_segments(struct task_struct *p, struct mm_struct *new_mm) | |
127 | { | |
128 | } | |
129 | ||
130 | /* | |
55ccf3fe SS |
131 | * this gets called so that we can store lazy state into memory and copy the |
132 | * current task into the new thread. | |
b920de1b | 133 | */ |
55ccf3fe | 134 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) |
b920de1b | 135 | { |
55ccf3fe SS |
136 | unlazy_fpu(src); |
137 | *dst = *src; | |
138 | return 0; | |
b920de1b DH |
139 | } |
140 | ||
141 | /* | |
142 | * set up the kernel stack for a new thread and copy arch-specific thread | |
143 | * control information | |
144 | */ | |
6f2c55b8 | 145 | int copy_thread(unsigned long clone_flags, |
b920de1b | 146 | unsigned long c_usp, unsigned long ustk_size, |
afa86fc4 | 147 | struct task_struct *p) |
b920de1b | 148 | { |
7c7fcf76 | 149 | struct thread_info *ti = task_thread_info(p); |
255461c5 | 150 | struct pt_regs *c_regs; |
b920de1b DH |
151 | unsigned long c_ksp; |
152 | ||
b920de1b DH |
153 | c_ksp = (unsigned long) task_stack_page(p) + THREAD_SIZE; |
154 | ||
155 | /* allocate the userspace exception frame and set it up */ | |
156 | c_ksp -= sizeof(struct pt_regs); | |
255461c5 | 157 | c_regs = (struct pt_regs *) c_ksp; |
61b7fbc3 | 158 | c_ksp -= 12; /* allocate function call ABI slack */ |
b920de1b | 159 | |
61b7fbc3 | 160 | /* set up things up so the scheduler can start the new task */ |
255461c5 | 161 | p->thread.uregs = c_regs; |
61b7fbc3 AV |
162 | ti->frame = c_regs; |
163 | p->thread.a3 = (unsigned long) c_regs; | |
164 | p->thread.sp = c_ksp; | |
165 | p->thread.wchan = p->thread.pc; | |
166 | p->thread.usp = c_usp; | |
b920de1b | 167 | |
1ea2a016 | 168 | if (unlikely(p->flags & PF_KTHREAD)) { |
61b7fbc3 AV |
169 | memset(c_regs, 0, sizeof(struct pt_regs)); |
170 | c_regs->a0 = c_usp; /* function */ | |
171 | c_regs->d0 = ustk_size; /* argument */ | |
172 | local_save_flags(c_regs->epsw); | |
173 | c_regs->epsw |= EPSW_IE | EPSW_IM_7; | |
174 | p->thread.pc = (unsigned long) ret_from_kernel_thread; | |
175 | return 0; | |
176 | } | |
1ea2a016 AV |
177 | *c_regs = *current_pt_regs(); |
178 | if (c_usp) | |
179 | c_regs->sp = c_usp; | |
255461c5 | 180 | c_regs->epsw &= ~EPSW_FE; /* my FPU */ |
b920de1b DH |
181 | |
182 | /* the new TLS pointer is passed in as arg #5 to sys_clone() */ | |
183 | if (clone_flags & CLONE_SETTLS) | |
255461c5 | 184 | c_regs->e2 = current_frame()->d3; |
b920de1b | 185 | |
b920de1b | 186 | p->thread.pc = (unsigned long) ret_from_fork; |
b920de1b DH |
187 | |
188 | return 0; | |
189 | } | |
190 | ||
b920de1b DH |
191 | unsigned long get_wchan(struct task_struct *p) |
192 | { | |
193 | return p->thread.wchan; | |
194 | } |