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1 | /* |
2 | * linux/arch/ppc64/kernel/ptrace-common.h | |
3 | * | |
4 | * Copyright (c) 2002 Stephen Rothwell, IBM Coproration | |
5 | * Extracted from ptrace.c and ptrace32.c | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General | |
8 | * Public License. See the file README.legal in the main directory of | |
9 | * this archive for more details. | |
10 | */ | |
11 | ||
12 | #ifndef _PPC64_PTRACE_COMMON_H | |
13 | #define _PPC64_PTRACE_COMMON_H | |
14 | /* | |
15 | * Set of msr bits that gdb can change on behalf of a process. | |
16 | */ | |
17 | #define MSR_DEBUGCHANGE (MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1) | |
18 | ||
19 | /* | |
20 | * Get contents of register REGNO in task TASK. | |
21 | */ | |
22 | static inline unsigned long get_reg(struct task_struct *task, int regno) | |
23 | { | |
24 | unsigned long tmp = 0; | |
25 | ||
26 | /* | |
27 | * Put the correct FP bits in, they might be wrong as a result | |
28 | * of our lazy FP restore. | |
29 | */ | |
30 | if (regno == PT_MSR) { | |
31 | tmp = ((unsigned long *)task->thread.regs)[PT_MSR]; | |
32 | tmp |= task->thread.fpexc_mode; | |
33 | } else if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long))) { | |
34 | tmp = ((unsigned long *)task->thread.regs)[regno]; | |
35 | } | |
36 | ||
37 | return tmp; | |
38 | } | |
39 | ||
40 | /* | |
41 | * Write contents of register REGNO in task TASK. | |
42 | */ | |
43 | static inline int put_reg(struct task_struct *task, int regno, | |
44 | unsigned long data) | |
45 | { | |
46 | if (regno < PT_SOFTE) { | |
47 | if (regno == PT_MSR) | |
48 | data = (data & MSR_DEBUGCHANGE) | |
49 | | (task->thread.regs->msr & ~MSR_DEBUGCHANGE); | |
50 | ((unsigned long *)task->thread.regs)[regno] = data; | |
51 | return 0; | |
52 | } | |
53 | return -EIO; | |
54 | } | |
55 | ||
56 | static inline void set_single_step(struct task_struct *task) | |
57 | { | |
58 | struct pt_regs *regs = task->thread.regs; | |
59 | if (regs != NULL) | |
60 | regs->msr |= MSR_SE; | |
61 | set_ti_thread_flag(task->thread_info, TIF_SINGLESTEP); | |
62 | } | |
63 | ||
64 | static inline void clear_single_step(struct task_struct *task) | |
65 | { | |
66 | struct pt_regs *regs = task->thread.regs; | |
67 | if (regs != NULL) | |
68 | regs->msr &= ~MSR_SE; | |
69 | clear_ti_thread_flag(task->thread_info, TIF_SINGLESTEP); | |
70 | } | |
71 | ||
72 | #endif /* _PPC64_PTRACE_COMMON_H */ |