| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 */ |