ptrace.c

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#include <linux/sched.h>
#include "asm/ptrace.h"

int putreg(struct task_struct *child, unsigned long regno, 
          unsigned long value)
{
    child->thread.process_regs.regs[regno >> 2] = value;
    return 0;
}

int poke_user(struct task_struct *child, long addr, long data)
{
    if ((addr & 3) || addr < 0)
        return -EIO;

    if (addr < MAX_REG_OFFSET)
        return putreg(child, addr, data);

    else if((addr >= offsetof(struct user, u_debugreg[0])) &&
        (addr <= offsetof(struct user, u_debugreg[7]))){
          addr -= offsetof(struct user, u_debugreg[0]);
          addr = addr >> 2;
          if((addr == 4) || (addr == 5)) return -EIO;
          child->thread.arch.debugregs[addr] = data;
          return 0;
    }
    return -EIO;
}

unsigned long getreg(struct task_struct *child, unsigned long regno)
{
    unsigned long retval = ~0UL;

    retval &= child->thread.process_regs.regs[regno >> 2];
    return retval;
}

int peek_user(struct task_struct *child, long addr, long data)
{
    /* read the word at location addr in the USER area. */
    unsigned long tmp;

    if ((addr & 3) || addr < 0)
        return -EIO;

    tmp = 0;  /* Default return condition */
    if(addr < MAX_REG_OFFSET){
        tmp = getreg(child, addr);
    }
    else if((addr >= offsetof(struct user, u_debugreg[0])) &&
        (addr <= offsetof(struct user, u_debugreg[7]))){
        addr -= offsetof(struct user, u_debugreg[0]);
        addr = addr >> 2;
        tmp = child->thread.arch.debugregs[addr];
    }
    return put_user(tmp, (unsigned long *) data);
}