release/src-rt-6.x/linux/linux-2.6/arch/powerpc/kernel/ptrace-common.h

   1 /*
   2  *    Copyright (c) 2002 Stephen Rothwell, IBM Coproration
   3  *    Extracted from ptrace.c and ptrace32.c
   4  *
   5  * This file is subject to the terms and conditions of the GNU General
   6  * Public License.  See the file README.legal in the main directory of
   7  * this archive for more details.
   8  */
   9
  10 #ifndef _PPC64_PTRACE_COMMON_H
  11 #define _PPC64_PTRACE_COMMON_H
  12
  13 #include <asm/system.h>
  14
  15 /*
  16  * Set of msr bits that gdb can change on behalf of a process.
  17  */
  18 #define MSR_DEBUGCHANGE (MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1)
  19
  20 /*
  21  * Get contents of register REGNO in task TASK.
  22  */
  23 static inline unsigned long get_reg(struct task_struct *task, int regno)
  24 {
  25         unsigned long tmp = 0;
  26
  27         /*
  28          * Put the correct FP bits in, they might be wrong as a result
  29          * of our lazy FP restore.
  30          */
  31         if (regno == PT_MSR) {
  32                 tmp = ((unsigned long *)task->thread.regs)[PT_MSR];
  33                 tmp |= task->thread.fpexc_mode;
  34         } else if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long))) {
  35                 tmp = ((unsigned long *)task->thread.regs)[regno];
  36         }
  37
  38         return tmp;
  39 }
  40
  41 /*
  42  * Write contents of register REGNO in task TASK.
  43  */
  44 static inline int put_reg(struct task_struct *task, int regno,
  45                           unsigned long data)
  46 {
  47         if (regno < PT_SOFTE) {
  48                 if (regno == PT_MSR)
  49                         data = (data & MSR_DEBUGCHANGE)
  50                                 | (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
  51                 ((unsigned long *)task->thread.regs)[regno] = data;
  52                 return 0;
  53         }
  54         return -EIO;
  55 }
  56
  57 static inline void set_single_step(struct task_struct *task)
  58 {
  59         struct pt_regs *regs = task->thread.regs;
  60         if (regs != NULL)
  61                 regs->msr |= MSR_SE;
  62         set_tsk_thread_flag(task, TIF_SINGLESTEP);
  63 }
  64
  65 static inline void clear_single_step(struct task_struct *task)
  66 {
  67         struct pt_regs *regs = task->thread.regs;
  68         if (regs != NULL)
  69                 regs->msr &= ~MSR_SE;
  70         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
  71 }
  72
  73 #ifdef CONFIG_ALTIVEC
  74 /*
  75  * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
  76  * The transfer totals 34 quadword.  Quadwords 0-31 contain the
  77  * corresponding vector registers.  Quadword 32 contains the vscr as the
  78  * last word (offset 12) within that quadword.  Quadword 33 contains the
  79  * vrsave as the first word (offset 0) within the quadword.
  80  *
  81  * This definition of the VMX state is compatible with the current PPC32
  82  * ptrace interface.  This allows signal handling and ptrace to use the
  83  * same structures.  This also simplifies the implementation of a bi-arch
  84  * (combined (32- and 64-bit) gdb.
  85  */
  86
  87 /*
  88  * Get contents of AltiVec register state in task TASK
  89  */
  90 static inline int get_vrregs(unsigned long __user *data,
  91                              struct task_struct *task)
  92 {
  93         unsigned long regsize;
  94
  95         /* copy AltiVec registers VR[0] .. VR[31] */
  96         regsize = 32 * sizeof(vector128);
  97         if (copy_to_user(data, task->thread.vr, regsize))
  98                 return -EFAULT;
  99         data += (regsize / sizeof(unsigned long));
 100
 101         /* copy VSCR */
 102         regsize = 1 * sizeof(vector128);
 103         if (copy_to_user(data, &task->thread.vscr, regsize))
 104                 return -EFAULT;
 105         data += (regsize / sizeof(unsigned long));
 106
 107         /* copy VRSAVE */
 108         if (put_user(task->thread.vrsave, (u32 __user *)data))
 109                 return -EFAULT;
 110
 111         return 0;
 112 }
 113
 114 /*
 115  * Write contents of AltiVec register state into task TASK.
 116  */
 117 static inline int set_vrregs(struct task_struct *task,
 118                              unsigned long __user *data)
 119 {
 120         unsigned long regsize;
 121
 122         /* copy AltiVec registers VR[0] .. VR[31] */
 123         regsize = 32 * sizeof(vector128);
 124         if (copy_from_user(task->thread.vr, data, regsize))
 125                 return -EFAULT;
 126         data += (regsize / sizeof(unsigned long));
 127
 128         /* copy VSCR */
 129         regsize = 1 * sizeof(vector128);
 130         if (copy_from_user(&task->thread.vscr, data, regsize))
 131                 return -EFAULT;
 132         data += (regsize / sizeof(unsigned long));
 133
 134         /* copy VRSAVE */
 135         if (get_user(task->thread.vrsave, (u32 __user *)data))
 136                 return -EFAULT;
 137
 138         return 0;
 139 }
 140 #endif
 141
 142 static inline int ptrace_set_debugreg(struct task_struct *task,
 143                                       unsigned long addr, unsigned long data)
 144 {
 145         /* We only support one DABR and no IABRS at the moment */
 146         if (addr > 0)
 147                 return -EINVAL;
 148
 149         /* The bottom 3 bits are flags */
 150         if ((data & ~0x7UL) >= TASK_SIZE)
 151                 return -EIO;
 152
 153         /* Ensure translation is on */
 154         if (data && !(data & DABR_TRANSLATION))
 155                 return -EIO;
 156
 157         task->thread.dabr = data;
 158         return 0;
 159 }
 160
 161 #endif /* _PPC64_PTRACE_COMMON_H */