2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2008-2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
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
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>
18 #include <linux/tick.h>
19 #include <linux/bitops.h>
20 #include <linux/ptrace.h>
21 #include <asm/pgalloc.h>
22 #include <linux/uaccess.h> /* for USER_DS macros */
23 #include <asm/cacheflush.h>
25 void show_regs(struct pt_regs
*regs
)
27 show_regs_print_info(KERN_INFO
);
29 pr_info(" Registers dump: mode=%X\r\n", regs
->pt_mode
);
30 pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
31 regs
->r1
, regs
->r2
, regs
->r3
, regs
->r4
);
32 pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
33 regs
->r5
, regs
->r6
, regs
->r7
, regs
->r8
);
34 pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
35 regs
->r9
, regs
->r10
, regs
->r11
, regs
->r12
);
36 pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
37 regs
->r13
, regs
->r14
, regs
->r15
, regs
->r16
);
38 pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
39 regs
->r17
, regs
->r18
, regs
->r19
, regs
->r20
);
40 pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
41 regs
->r21
, regs
->r22
, regs
->r23
, regs
->r24
);
42 pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
43 regs
->r25
, regs
->r26
, regs
->r27
, regs
->r28
);
44 pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
45 regs
->r29
, regs
->r30
, regs
->r31
, regs
->pc
);
46 pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
47 regs
->msr
, regs
->ear
, regs
->esr
, regs
->fsr
);
50 void (*pm_power_off
)(void) = NULL
;
51 EXPORT_SYMBOL(pm_power_off
);
53 void flush_thread(void)
57 int copy_thread(unsigned long clone_flags
, unsigned long usp
,
58 unsigned long arg
, struct task_struct
*p
)
60 struct pt_regs
*childregs
= task_pt_regs(p
);
61 struct thread_info
*ti
= task_thread_info(p
);
63 if (unlikely(p
->flags
& PF_KTHREAD
)) {
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)usp
; /* fn */
70 ti
->cpu_context
.r19
= (unsigned long)arg
;
71 childregs
->pt_mode
= 1;
72 local_save_flags(childregs
->msr
);
74 ti
->cpu_context
.msr
= childregs
->msr
& ~MSR_IE
;
76 ti
->cpu_context
.r15
= (unsigned long)ret_from_kernel_thread
- 8;
79 *childregs
= *current_pt_regs();
83 memset(&ti
->cpu_context
, 0, sizeof(struct cpu_context
));
84 ti
->cpu_context
.r1
= (unsigned long)childregs
;
86 ti
->cpu_context
.msr
= (unsigned long)childregs
->msr
;
88 childregs
->msr
|= MSR_UMS
;
90 /* we should consider the fact that childregs is a copy of the parent
91 * regs which were saved immediately after entering the kernel state
92 * before enabling VM. This MSR will be restored in switch_to and
93 * RETURN() and we want to have the right machine state there
94 * specifically this state must have INTs disabled before and enabled
95 * after performing rtbd
96 * compose the right MSR for RETURN(). It will work for switch_to also
97 * excepting for VM and UMS
98 * don't touch UMS , CARRY and cache bits
99 * right now MSR is a copy of parent one */
100 childregs
->msr
&= ~MSR_EIP
;
101 childregs
->msr
|= MSR_IE
;
102 childregs
->msr
&= ~MSR_VM
;
103 childregs
->msr
|= MSR_VMS
;
104 childregs
->msr
|= MSR_EE
; /* exceptions will be enabled*/
106 ti
->cpu_context
.msr
= (childregs
->msr
|MSR_VM
);
107 ti
->cpu_context
.msr
&= ~MSR_UMS
; /* switch_to to kernel mode */
108 ti
->cpu_context
.msr
&= ~MSR_IE
;
110 ti
->cpu_context
.r15
= (unsigned long)ret_from_fork
- 8;
113 * r21 is the thread reg, r10 is 6th arg to clone
114 * which contains TLS area
116 if (clone_flags
& CLONE_SETTLS
)
117 childregs
->r21
= childregs
->r10
;
124 * Return saved PC of a blocked thread.
126 unsigned long thread_saved_pc(struct task_struct
*tsk
)
128 struct cpu_context
*ctx
=
129 &(((struct thread_info
*)(tsk
->stack
))->cpu_context
);
131 /* Check whether the thread is blocked in resume() */
132 if (in_sched_functions(ctx
->r15
))
133 return (unsigned long)ctx
->r15
;
139 unsigned long get_wchan(struct task_struct
*p
)
141 /* TBD (used by procfs) */
145 /* Set up a thread for executing a new program */
146 void start_thread(struct pt_regs
*regs
, unsigned long pc
, unsigned long usp
)
152 regs
->msr
|= MSR_UMS
;
153 regs
->msr
&= ~MSR_VM
;
158 #include <linux/elfcore.h>
160 * Set up a thread for executing a new program
162 int dump_fpu(struct pt_regs
*regs
, elf_fpregset_t
*fpregs
)
164 return 0; /* MicroBlaze has no separate FPU registers */
166 #endif /* CONFIG_MMU */
168 void arch_cpu_idle(void)