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Mon Mar 4 17:35:09 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>

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* hurd/catch-signal.c (hurd_safe_memmove): New function.
	(hurd_safe_copyin, hurd_safe_copyout): New functions.
	* hurd/hurd/sigpreempt.h: Declare them.
This commit is contained in:
Roland McGrath
1996-03-04 22:45:04 +00:00
parent 661fa17673
commit c3d3967cd2
4 changed files with 92 additions and 114 deletions
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79
hurd/catch-signal.c
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@ -85,3 +85,82 @@ hurd_safe_memset (void *dest, int byte, size_t nbytes)
(vm_address_t) dest, (vm_address_t) dest + nbytes,
&operate, SIG_ERR);
}
error_t
hurd_safe_copyout (void *dest, const void *src, size_t nbytes)
{
error_t operate (struct hurd_signal_preempter *preempter)
{
memcpy (dest, src, nbytes);
return 0;
}
return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV),
(vm_address_t) dest, (vm_address_t) dest + nbytes,
&operate, SIG_ERR);
}
error_t
hurd_safe_copyin (void *dest, const void *src, size_t nbytes)
{
error_t operate (struct hurd_signal_preempter *preempter)
{
memcpy (dest, src, nbytes);
return 0;
}
return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV),
(vm_address_t) src, (vm_address_t) src + nbytes,
&operate, SIG_ERR);
}
error_t
hurd_safe_memmove (void *dest, const void *src, size_t nbytes)
{
jmp_buf buf;
void throw (int signo, long int sigcode, struct sigcontext *scp)
{ longjmp (buf, scp->sc_error ?: EGRATUITOUS); }
struct hurd_signal_preempter src_preempter =
{
sigmask (SIGBUS) | sigmask (SIGSEGV),
(vm_address_t) src, (vm_address_t) src + nbytes,
NULL, (sighandler_t) &throw,
};
struct hurd_signal_preempter dest_preempter =
{
sigmask (SIGBUS) | sigmask (SIGSEGV),
(vm_address_t) dest, (vm_address_t) dest + nbytes,
NULL, (sighandler_t) &throw,
&src_preempter
};
struct hurd_sigstate *const ss = _hurd_self_sigstate ();
error_t error;
/* This returns again with nonzero value when we preempt a signal. */
error = setjmp (buf);
if (error == 0)
{
/* Install a signal preempter for the thread. */
__spin_lock (&ss->lock);
src_preempter.next = ss->preempters;
ss->preempters = &dest_preempter;
__spin_unlock (&ss->lock);
/* Do the copy; it might fault. */
memmove (dest, src, nbytes);
}
/* Either memmove completed happily and ERROR is still zero, or it hit
an expected signal and `throw' made setjmp return the signal error
code in ERROR. Now we can remove the preempter and return. */
__spin_lock (&ss->lock);
assert (ss->preempters == &dest_preempter);
ss->preempters = src_preempter.next;
__spin_unlock (&ss->lock);
return error;
}