int copy_user(struct task_struct *task,saddr_t useraddr, addr_t copyaddr,
int len, int tofromuser, int writingtouser)
{
int copylen=0,copymax;
addr_t realuseraddr;
saddr_t enduseraddr;
unsigned long mask;
#ifdef CONFIG_S390_SUPPORT
if (current->thread.flags & S390_FLAG_31BIT) {
/* adjust user offsets to 64 bit structure */
if (useraddr < PT_PSWADDR / 2)
useraddr = 2 * useraddr;
else if(useraddr < PT_ACR0 / 2)
useraddr = 2 * useraddr + sizeof(addr_t) / 2;
else if(useraddr < PT_ACR0 / 2 + (PT_ORIGGPR2 - PT_ACR0))
useraddr = useraddr + PT_ACR0 / 2;
else if(useraddr < PT_ACR0 / 2 + (sizeof(struct user_regs_struct) - sizeof(addr_t) / 2 - PT_ACR0))
useraddr = useraddr + PT_ACR0 / 2 + sizeof(addr_t) / 2;
}
#endif
enduseraddr=useraddr+len;
if (useraddr < 0 || enduseraddr > sizeof(struct user)||
(useraddr < PT_ENDREGS && (useraddr&3))||
(enduseraddr < PT_ENDREGS && (enduseraddr&3)))
return (-EIO);
while(len>0)
{
mask=PSW_ADDR_MASK;
if(useraddr<PT_FPC)
{
realuseraddr=((addr_t) __KSTK_PTREGS(task)) + useraddr;
if(useraddr<PT_PSWMASK)
{
copymax=PT_PSWMASK;
}
else if(useraddr<(PT_PSWMASK+8))
{
copymax=(PT_PSWMASK+8);
if(writingtouser)
mask=PSW_MASK_DEBUGCHANGE;
}
else if(useraddr<(PT_PSWADDR+8))
{
copymax=PT_PSWADDR+8;
mask=PSW_ADDR_DEBUGCHANGE;
}
else
copymax=PT_FPC;
}
else if(useraddr<(PT_FPR15+sizeof(freg_t)))
{
copymax=(PT_FPR15+sizeof(freg_t));
realuseraddr=(addr_t)&(((u8 *)&task->thread.fp_regs)[useraddr-PT_FPC]);
}
else if(useraddr<sizeof(struct user_regs_struct))
{
copymax=sizeof(struct user_regs_struct);
realuseraddr=(addr_t)&(((u8 *)&task->thread.per_info)[useraddr-PT_CR_9]);
}
else
{
copymax=sizeof(struct user);
realuseraddr=(addr_t)NULL;
}
copylen=copymax-useraddr;
copylen=(copylen>len ? len:copylen);
if(ptrace_usercopy(realuseraddr,copyaddr,copylen,tofromuser,writingtouser,mask))
return (-EIO);
copyaddr+=copylen;
len-=copylen;
useraddr+=copylen;
}
FixPerRegisters(task);
return(0);
}
int copy_user(struct task_struct *task,saddr_t useraddr,addr_t copyaddr,int len,int tofromuser,int writingtouser)
{
int copylen=0,copymax;
addr_t realuseraddr;
saddr_t enduseraddr=useraddr+len;
u32 mask;
if (useraddr < 0 || enduseraddr > sizeof(struct user)||
(useraddr < PT_ENDREGS && (useraddr&3))||
(enduseraddr < PT_ENDREGS && (enduseraddr&3)))
return (-EIO);
while(len>0)
{
mask=0xffffffff;
if(useraddr<PT_FPC)
{
realuseraddr=((addr_t) __KSTK_PTREGS(task)) + useraddr;
if(useraddr<PT_PSWMASK)
{
copymax=PT_PSWMASK;
}
else if(useraddr<(PT_PSWMASK+4))
{
copymax=(PT_PSWMASK+4);
if(writingtouser)
mask=PSW_MASK_DEBUGCHANGE;
}
else if(useraddr<(PT_PSWADDR+4))
{
copymax=PT_PSWADDR+4;
mask=PSW_ADDR_DEBUGCHANGE;
}
else
copymax=PT_FPC;
}
else if(useraddr<(PT_FPR15_LO+4))
{
copymax=(PT_FPR15_LO+4);
realuseraddr=(addr_t)&(((u8 *)&task->thread.fp_regs)[useraddr-PT_FPC]);
}
else if(useraddr<sizeof(struct user_regs_struct))
{
copymax=sizeof(struct user_regs_struct);
realuseraddr=(addr_t)&(((u8 *)&task->thread.per_info)[useraddr-PT_CR_9]);
}
else
{
copymax=sizeof(struct user);
realuseraddr=(addr_t)NULL;
}
copylen=copymax-useraddr;
copylen=(copylen>len ? len:copylen);
if(ptrace_usercopy(realuseraddr,copyaddr,copylen,tofromuser,writingtouser,mask))
return (-EIO);
copyaddr+=copylen;
len-=copylen;
useraddr+=copylen;
}
FixPerRegisters(task);
return(0);
}