arch/powerpc/kernel/ptrace-common.h

   1 /*
   2  *    Copyright (c) 2002 Stephen Rothwell, IBM Coproration
   3  *    Copyright (c) 2007 Benjamin Herrenschmidt, IBM Coproration
   4  *    Extracted from ptrace.c and ptrace32.c
   5  *
   6  * This file is subject to the terms and conditions of the GNU General
   7  * Public License.  See the file README.legal in the main directory of
   8  * this archive for more details.
   9  */
  10
  11 #ifndef _POWERPC_PTRACE_COMMON_H
  12 #define _POWERPC_PTRACE_COMMON_H
  13
  14 /*
  15  * Get contents of register REGNO in task TASK.
  16  */
  17 static inline unsigned long get_reg(struct task_struct *task, int regno)
  18 {
  19         unsigned long tmp = 0;
  20
  21         if (task->thread.regs == NULL)
  22                 return -EIO;
  23
  24         if (regno == PT_MSR) {
  25                 tmp = ((unsigned long *)task->thread.regs)[PT_MSR];
  26                 return PT_MUNGE_MSR(tmp, task);
  27         }
  28
  29         if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
  30                 return ((unsigned long *)task->thread.regs)[regno];
  31
  32         return -EIO;
  33 }
  34
  35 /*
  36  * Write contents of register REGNO in task TASK.
  37  */
  38 static inline int put_reg(struct task_struct *task, int regno,
  39                           unsigned long data)
  40 {
  41         if (task->thread.regs == NULL)
  42                 return -EIO;
  43
  44         if (regno <= PT_MAX_PUT_REG) {
  45                 if (regno == PT_MSR)
  46                         data = (data & MSR_DEBUGCHANGE)
  47                                 | (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
  48                 ((unsigned long *)task->thread.regs)[regno] = data;
  49                 return 0;
  50         }
  51         return -EIO;
  52 }
  53
  54
  55 #ifdef CONFIG_ALTIVEC
  56 /*
  57  * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
  58  * The transfer totals 34 quadword.  Quadwords 0-31 contain the
  59  * corresponding vector registers.  Quadword 32 contains the vscr as the
  60  * last word (offset 12) within that quadword.  Quadword 33 contains the
  61  * vrsave as the first word (offset 0) within the quadword.
  62  *
  63  * This definition of the VMX state is compatible with the current PPC32
  64  * ptrace interface.  This allows signal handling and ptrace to use the
  65  * same structures.  This also simplifies the implementation of a bi-arch
  66  * (combined (32- and 64-bit) gdb.
  67  */
  68
  69 /*
  70  * Get contents of AltiVec register state in task TASK
  71  */
  72 static inline int get_vrregs(unsigned long __user *data,
  73                              struct task_struct *task)
  74 {
  75         unsigned long regsize;
  76
  77         /* copy AltiVec registers VR[0] .. VR[31] */
  78         regsize = 32 * sizeof(vector128);
  79         if (copy_to_user(data, task->thread.vr, regsize))
  80                 return -EFAULT;
  81         data += (regsize / sizeof(unsigned long));
  82
  83         /* copy VSCR */
  84         regsize = 1 * sizeof(vector128);
  85         if (copy_to_user(data, &task->thread.vscr, regsize))
  86                 return -EFAULT;
  87         data += (regsize / sizeof(unsigned long));
  88
  89         /* copy VRSAVE */
  90         if (put_user(task->thread.vrsave, (u32 __user *)data))
  91                 return -EFAULT;
  92
  93         return 0;
  94 }
  95
  96 /*
  97  * Write contents of AltiVec register state into task TASK.
  98  */
  99 static inline int set_vrregs(struct task_struct *task,
 100                              unsigned long __user *data)
 101 {
 102         unsigned long regsize;
 103
 104         /* copy AltiVec registers VR[0] .. VR[31] */
 105         regsize = 32 * sizeof(vector128);
 106         if (copy_from_user(task->thread.vr, data, regsize))
 107                 return -EFAULT;
 108         data += (regsize / sizeof(unsigned long));
 109
 110         /* copy VSCR */
 111         regsize = 1 * sizeof(vector128);
 112         if (copy_from_user(&task->thread.vscr, data, regsize))
 113                 return -EFAULT;
 114         data += (regsize / sizeof(unsigned long));
 115
 116         /* copy VRSAVE */
 117         if (get_user(task->thread.vrsave, (u32 __user *)data))
 118                 return -EFAULT;
 119
 120         return 0;
 121 }
 122 #endif /* CONFIG_ALTIVEC */
 123
 124 static inline void set_single_step(struct task_struct *task)
 125 {
 126         struct pt_regs *regs = task->thread.regs;
 127
 128         if (regs != NULL) {
 129 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 130                 task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC;
 131                 regs->msr |= MSR_DE;
 132 #else
 133                 regs->msr |= MSR_SE;
 134 #endif
 135         }
 136         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 137 }
 138
 139 static inline void clear_single_step(struct task_struct *task)
 140 {
 141         struct pt_regs *regs = task->thread.regs;
 142
 143         if (regs != NULL) {
 144 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 145                 task->thread.dbcr0 = 0;
 146                 regs->msr &= ~MSR_DE;
 147 #else
 148                 regs->msr &= ~MSR_SE;
 149 #endif
 150         }
 151         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 152 }
 153
 154 #endif /* _POWERPC_PTRACE_COMMON_H */