From d8f106289ffc338f15568f373b209f0c47755a54 Mon Sep 17 00:00:00 2001 From: Chris Zankel Date: Wed, 20 Feb 2008 00:30:54 +0000 Subject: Xtensa: Provide an architecture specific sigaction and sa_restorer function in libc to avoid having to place executable code on stack. Signed-off-by: Chris Zankel --- libc/sysdeps/linux/xtensa/sigaction.c | 59 +++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 libc/sysdeps/linux/xtensa/sigaction.c (limited to 'libc/sysdeps/linux/xtensa/sigaction.c') diff --git a/libc/sysdeps/linux/xtensa/sigaction.c b/libc/sysdeps/linux/xtensa/sigaction.c new file mode 100644 index 000000000..5ef40c36e --- /dev/null +++ b/libc/sysdeps/linux/xtensa/sigaction.c @@ -0,0 +1,59 @@ +/* vi: set sw=4 ts=4: */ +/* + * sigaction() for Xtensa uClibc + * + * Copyright (C) 2007, 2008 Tensilica Inc. + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +#include +#include +#include +#include +#include + +#define SA_RESTORER 0x04000000 + +extern void __default_sa_restorer (void); + +libc_hidden_proto(memcpy) + +int __libc_sigaction (int signum, const struct sigaction *act, + struct sigaction *oldact) +{ + struct kernel_sigaction kact, koldact; + int result; + + if (act) { + kact.k_sa_handler = act->sa_handler; + memcpy(&kact.sa_mask, &act->sa_mask, sizeof (kact.sa_mask)); + kact.sa_flags = act->sa_flags; + + if (kact.sa_flags & SA_RESTORER) { + kact.sa_restorer = act->sa_restorer; + } else { + kact.sa_restorer = __default_sa_restorer; + kact.sa_flags |= SA_RESTORER; + } + } + + result = __syscall_rt_sigaction(signum, act ? __ptrvalue (&kact) : NULL, + oldact ? __ptrvalue (&koldact) : NULL, + _NSIG / 8); + + if (oldact && result >= 0) { + oldact->sa_handler = koldact.k_sa_handler; + memcpy(&oldact->sa_mask, &koldact.sa_mask, sizeof(oldact->sa_mask)); + oldact->sa_flags = koldact.sa_flags; + oldact->sa_restorer = koldact.sa_restorer; + } + + return result; +} + +#ifndef LIBC_SIGACTION +libc_hidden_proto (sigaction) +weak_alias (__libc_sigaction, sigaction) +libc_hidden_weak (sigaction) +#endif -- cgit v1.2.3