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/* Wrapper for setting errno.
*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* This routine is jumped to by all the syscall handlers, to stash
* an error number into errno. */
/* This version uses a lot of magic and relies heavily on x86
* calling convention ... The advantage is that this is the same
* size as the previous __syscall_error() but all the .S functions
* need just one instruction.
*
* Local .S files have to set %eax to the negative errno value
* and then jump to this function. The neglected return to caller
* and return value of -1 is taken care of here so we don't have to
* worry about it in the .S functions.
*
* We have to stash the errno from %eax in a local stack var because
* __set_errno will prob call a function thus clobbering %eax on us.
*/
#include <errno.h>
#include <features.h>
int attribute_hidden __syscall_error(void)
{
register int edx __asm__("%edx");
__asm__("mov %eax, %edx");
__asm__("negl %edx");
__set_errno(edx);
return -1;
}
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