include/asm-ppc64/ptrace-common.h

   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 */