diff options
Diffstat (limited to 'libc/sysdeps/linux/arc/sigrestorer.S')
| -rw-r--r-- | libc/sysdeps/linux/arc/sigrestorer.S | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/arc/sigrestorer.S b/libc/sysdeps/linux/arc/sigrestorer.S new file mode 100644 index 000000000..24531d89d --- /dev/null +++ b/libc/sysdeps/linux/arc/sigrestorer.S @@ -0,0 +1,21 @@ +/* + * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com) + * + * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + */ + +#include <sysdep.h> +#include <sys/syscall.h> + +/* + * Provide a real sigreturn stub to avoid kernel synthesizing one + * on user stack at runtime, which needs PTE permissions update + * (hence TLB entry update) and costly cache line flushes for + * code modification + */ + +ENTRY(__default_rt_sa_restorer) + mov r8, __NR_rt_sigreturn + ARC_TRAP_INSN +END(__default_rt_sa_restorer) +libc_hidden_def(__default_rt_sa_restorer) |