arch/um/sys-ppc/ptrace.c

   1 #include <linux/sched.h>
   2 #include "asm/ptrace.h"
   3
   4 int putreg(struct task_struct *child, unsigned long regno,
   5                   unsigned long value)
   6 {
   7         child->thread.process_regs.regs[regno >> 2] = value;
   8         return 0;
   9 }
  10
  11 int poke_user(struct task_struct *child, long addr, long data)
  12 {
  13         if ((addr & 3) || addr < 0)
  14                 return -EIO;
  15
  16         if (addr < MAX_REG_OFFSET)
  17                 return putreg(child, addr, data);
  18
  19         else if((addr >= offsetof(struct user, u_debugreg[0])) &&
  20                 (addr <= offsetof(struct user, u_debugreg[7]))){
  21                   addr -= offsetof(struct user, u_debugreg[0]);
  22                   addr = addr >> 2;
  23                   if((addr == 4) || (addr == 5)) return -EIO;
  24                   child->thread.arch.debugregs[addr] = data;
  25                   return 0;
  26         }
  27         return -EIO;
  28 }
  29
  30 unsigned long getreg(struct task_struct *child, unsigned long regno)
  31 {
  32         unsigned long retval = ~0UL;
  33
  34         retval &= child->thread.process_regs.regs[regno >> 2];
  35         return retval;
  36 }
  37
  38 int peek_user(struct task_struct *child, long addr, long data)
  39 {
  40         /* read the word at location addr in the USER area. */
  41         unsigned long tmp;
  42
  43         if ((addr & 3) || addr < 0)
  44                 return -EIO;
  45
  46         tmp = 0;  /* Default return condition */
  47         if(addr < MAX_REG_OFFSET){
  48                 tmp = getreg(child, addr);
  49         }
  50         else if((addr >= offsetof(struct user, u_debugreg[0])) &&
  51                 (addr <= offsetof(struct user, u_debugreg[7]))){
  52                 addr -= offsetof(struct user, u_debugreg[0]);
  53                 addr = addr >> 2;
  54                 tmp = child->thread.arch.debugregs[addr];
  55         }
  56         return put_user(tmp, (unsigned long *) data);
  57 }
  58