int restore_sigcontext(struct pt_regs *regs,
struct sigcontext __user *sc)
{
int err = 0;
int i;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
/*
* Enforce that sigcontext is like pt_regs, and doesn't mess
* up our stack alignment rules.
*/
BUILD_BUG_ON(sizeof(struct sigcontext) != sizeof(struct pt_regs));
BUILD_BUG_ON(sizeof(struct sigcontext) % 8 != 0);
for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
err |= __get_user(regs->regs[i], &sc->gregs[i]);
/* Ensure that the PL is always set to USER_PL. */
regs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(regs->ex1));
regs->faultnum = INT_SWINT_1_SIGRETURN;
return err;
}
/* Put registers back to task. */
static void putregs(struct task_struct *child, struct pt_regs *uregs)
{
struct pt_regs *regs = task_pt_regs(child);
/* Don't allow overwriting the kernel-internal flags word. */
uregs->flags = regs->flags;
/* Only allow setting the ICS bit in the ex1 word. */
uregs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(uregs->ex1));
*regs = *uregs;
}
/* Put registers back to task. */
static void putregs(struct task_struct *child, struct pt_regs *uregs)
{
struct pt_regs *regs = task_pt_regs(child);
/*
* Don't allow overwriting the kernel-internal flags word.
* But do set PT_FLAGS_RESTORE_REGS so that the kernel will reload
* all the callee-saved registers when returning to userspace.
*/
uregs->flags = regs->flags | PT_FLAGS_RESTORE_REGS;
/* Only allow setting the ICS bit in the ex1 word. */
uregs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(uregs->ex1));
*regs = *uregs;
}
int restore_sigcontext(struct pt_regs *regs,
struct sigcontext __user *sc)
{
int err = 0;
int i;
current_thread_info()->restart_block.fn = do_no_restart_syscall;
BUILD_BUG_ON(sizeof(struct sigcontext) != sizeof(struct pt_regs));
BUILD_BUG_ON(sizeof(struct sigcontext) % 8 != 0);
for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
err |= __get_user(regs->regs[i], &sc->gregs[i]);
regs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(regs->ex1));
regs->faultnum = INT_SWINT_1_SIGRETURN;
return err;
}
int restore_sigcontext(struct pt_regs *regs,
struct sigcontext __user *sc)
{
int err;
/* Always make any pending restarted system calls return -EINTR */
current->restart_block.fn = do_no_restart_syscall;
/*
* Enforce that sigcontext is like pt_regs, and doesn't mess
* up our stack alignment rules.
*/
BUILD_BUG_ON(sizeof(struct sigcontext) != sizeof(struct pt_regs));
BUILD_BUG_ON(sizeof(struct sigcontext) % 8 != 0);
err = __copy_from_user(regs, sc, sizeof(*regs));
/* Ensure that the PL is always set to USER_PL. */
regs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(regs->ex1));
regs->faultnum = INT_SWINT_1_SIGRETURN;
return err;
}
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
unsigned long __user *datap = (long __user __force *)data;
unsigned long tmp;
long ret = -EIO;
char *childreg;
struct pt_regs copyregs;
int ex1_offset;
switch (request) {
case PTRACE_PEEKUSR: /* */
if (addr >= PTREGS_SIZE)
break;
childreg = (char *)task_pt_regs(child) + addr;
#ifdef CONFIG_COMPAT
if (is_compat_task()) {
if (addr & (sizeof(compat_long_t)-1))
break;
ret = put_user(*(compat_long_t *)childreg,
(compat_long_t __user *)datap);
} else
#endif
{
if (addr & (sizeof(long)-1))
break;
ret = put_user(*(long *)childreg, datap);
}
break;
case PTRACE_POKEUSR: /* */
if (addr >= PTREGS_SIZE)
break;
childreg = (char *)task_pt_regs(child) + addr;
/* */
ex1_offset = PTREGS_OFFSET_EX1;
#if defined(CONFIG_COMPAT) && defined(__BIG_ENDIAN)
if (is_compat_task()) /* */
ex1_offset += sizeof(compat_long_t);
#endif
if (addr == ex1_offset)
data = PL_ICS_EX1(USER_PL, EX1_ICS(data));
#ifdef CONFIG_COMPAT
if (is_compat_task()) {
if (addr & (sizeof(compat_long_t)-1))
break;
*(compat_long_t *)childreg = data;
} else
#endif
{
if (addr & (sizeof(long)-1))
break;
*(long *)childreg = data;
}
ret = 0;
break;
case PTRACE_GETREGS: /* */
if (copy_to_user(datap, task_pt_regs(child),
sizeof(struct pt_regs)) == 0) {
ret = 0;
}
break;
case PTRACE_SETREGS: /* */
if (copy_from_user(©regs, datap,
sizeof(struct pt_regs)) == 0) {
copyregs.ex1 =
PL_ICS_EX1(USER_PL, EX1_ICS(copyregs.ex1));
*task_pt_regs(child) = copyregs;
ret = 0;
}
break;
case PTRACE_GETFPREGS: /* */
case PTRACE_SETFPREGS: /* */
break;
case PTRACE_SETOPTIONS:
/* */
child->ptrace &= ~PT_TRACE_MASK_TILE;
tmp = data & PTRACE_O_MASK_TILE;
data &= ~PTRACE_O_MASK_TILE;
ret = ptrace_request(child, request, addr, data);
if (tmp & PTRACE_O_TRACEMIGRATE)
child->ptrace |= PT_TRACE_MIGRATE;
break;
default:
#ifdef CONFIG_COMPAT
if (task_thread_info(current)->status & TS_COMPAT) {
ret = compat_ptrace_request(child, request,
addr, data);
break;
}
#endif
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}