1 | /* |
2 | * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> |
3 | * Copyright (C) 2008-2009 PetaLogix |
4 | * Copyright (C) 2006 Atmark Techno, Inc. |
5 | * |
6 | * This file is subject to the terms and conditions of the GNU General Public |
7 | * License. See the file "COPYING" in the main directory of this archive |
8 | * for more details. |
9 | */ |
10 | |
11 | #include <linux/cpu.h> |
12 | #include <linux/export.h> |
13 | #include <linux/sched.h> |
14 | #include <linux/sched/debug.h> |
15 | #include <linux/sched/task.h> |
16 | #include <linux/sched/task_stack.h> |
17 | #include <linux/pm.h> |
18 | #include <linux/tick.h> |
19 | #include <linux/bitops.h> |
20 | #include <linux/ptrace.h> |
21 | #include <asm/cacheflush.h> |
22 | |
23 | void show_regs(struct pt_regs *regs) |
24 | { |
25 | show_regs_print_info(KERN_INFO); |
26 | |
27 | pr_info(" Registers dump: mode=%X\r\n" , regs->pt_mode); |
28 | pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n" , |
29 | regs->r1, regs->r2, regs->r3, regs->r4); |
30 | pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n" , |
31 | regs->r5, regs->r6, regs->r7, regs->r8); |
32 | pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n" , |
33 | regs->r9, regs->r10, regs->r11, regs->r12); |
34 | pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n" , |
35 | regs->r13, regs->r14, regs->r15, regs->r16); |
36 | pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n" , |
37 | regs->r17, regs->r18, regs->r19, regs->r20); |
38 | pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n" , |
39 | regs->r21, regs->r22, regs->r23, regs->r24); |
40 | pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n" , |
41 | regs->r25, regs->r26, regs->r27, regs->r28); |
42 | pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n" , |
43 | regs->r29, regs->r30, regs->r31, regs->pc); |
44 | pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n" , |
45 | regs->msr, regs->ear, regs->esr, regs->fsr); |
46 | } |
47 | |
48 | void (*pm_power_off)(void) = NULL; |
49 | EXPORT_SYMBOL(pm_power_off); |
50 | |
51 | void flush_thread(void) |
52 | { |
53 | } |
54 | |
55 | int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) |
56 | { |
57 | unsigned long clone_flags = args->flags; |
58 | unsigned long usp = args->stack; |
59 | unsigned long tls = args->tls; |
60 | struct pt_regs *childregs = task_pt_regs(p); |
61 | struct thread_info *ti = task_thread_info(p); |
62 | |
63 | if (unlikely(args->fn)) { |
64 | /* if we're creating a new kernel thread then just zeroing all |
65 | * the registers. That's OK for a brand new thread.*/ |
66 | memset(childregs, 0, sizeof(struct pt_regs)); |
67 | memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); |
68 | ti->cpu_context.r1 = (unsigned long)childregs; |
69 | ti->cpu_context.r20 = (unsigned long)args->fn; |
70 | ti->cpu_context.r19 = (unsigned long)args->fn_arg; |
71 | childregs->pt_mode = 1; |
72 | local_save_flags(childregs->msr); |
73 | ti->cpu_context.msr = childregs->msr & ~MSR_IE; |
74 | ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8; |
75 | return 0; |
76 | } |
77 | *childregs = *current_pt_regs(); |
78 | if (usp) |
79 | childregs->r1 = usp; |
80 | |
81 | memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); |
82 | ti->cpu_context.r1 = (unsigned long)childregs; |
83 | childregs->msr |= MSR_UMS; |
84 | |
85 | /* we should consider the fact that childregs is a copy of the parent |
86 | * regs which were saved immediately after entering the kernel state |
87 | * before enabling VM. This MSR will be restored in switch_to and |
88 | * RETURN() and we want to have the right machine state there |
89 | * specifically this state must have INTs disabled before and enabled |
90 | * after performing rtbd |
91 | * compose the right MSR for RETURN(). It will work for switch_to also |
92 | * excepting for VM and UMS |
93 | * don't touch UMS , CARRY and cache bits |
94 | * right now MSR is a copy of parent one */ |
95 | childregs->msr &= ~MSR_EIP; |
96 | childregs->msr |= MSR_IE; |
97 | childregs->msr &= ~MSR_VM; |
98 | childregs->msr |= MSR_VMS; |
99 | childregs->msr |= MSR_EE; /* exceptions will be enabled*/ |
100 | |
101 | ti->cpu_context.msr = (childregs->msr|MSR_VM); |
102 | ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */ |
103 | ti->cpu_context.msr &= ~MSR_IE; |
104 | ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8; |
105 | |
106 | /* |
107 | * r21 is the thread reg, r10 is 6th arg to clone |
108 | * which contains TLS area |
109 | */ |
110 | if (clone_flags & CLONE_SETTLS) |
111 | childregs->r21 = tls; |
112 | |
113 | return 0; |
114 | } |
115 | |
116 | unsigned long __get_wchan(struct task_struct *p) |
117 | { |
118 | /* TBD (used by procfs) */ |
119 | return 0; |
120 | } |
121 | |
122 | /* Set up a thread for executing a new program */ |
123 | void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) |
124 | { |
125 | regs->pc = pc; |
126 | regs->r1 = usp; |
127 | regs->pt_mode = 0; |
128 | regs->msr |= MSR_UMS; |
129 | regs->msr &= ~MSR_VM; |
130 | } |
131 | |
132 | #include <linux/elfcore.h> |
133 | /* |
134 | * Set up a thread for executing a new program |
135 | */ |
136 | int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu) |
137 | { |
138 | return 0; /* MicroBlaze has no separate FPU registers */ |
139 | } |
140 | |
141 | void arch_cpu_idle(void) |
142 | { |
143 | } |
144 | |