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authorVineet Gupta <vgupta@synopsys.com>2015-02-14 15:25:43 +0530
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2015-02-16 21:52:13 +0100
commit65bc357213f1c08e339757923740f5d68212cf76 (patch)
tree32cf153ea1fb1843987041386a735c3bdf985807
parent90b115c036d68c4c581ae974cdbf5352ad7daa84 (diff)
ARC: sigaction: fold default sigrestorer into "C"
Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
-rw-r--r--libc/sysdeps/linux/arc/Makefile.arch3
-rw-r--r--libc/sysdeps/linux/arc/sigaction.c14
-rw-r--r--libc/sysdeps/linux/arc/sigrestorer.S21
3 files changed, 8 insertions, 30 deletions
diff --git a/libc/sysdeps/linux/arc/Makefile.arch b/libc/sysdeps/linux/arc/Makefile.arch
index 656ea3518..1a52fc9bf 100644
--- a/libc/sysdeps/linux/arc/Makefile.arch
+++ b/libc/sysdeps/linux/arc/Makefile.arch
@@ -7,5 +7,4 @@
CSRC-y := syscall.c sigaction.c __syscall_error.c cacheflush.c
-SSRC-y := sigrestorer.S __longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S \
- vfork.S clone.S
+SSRC-y := __longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S vfork.S clone.S
diff --git a/libc/sysdeps/linux/arc/sigaction.c b/libc/sysdeps/linux/arc/sigaction.c
index a34c7cf4c..96c9983b1 100644
--- a/libc/sysdeps/linux/arc/sigaction.c
+++ b/libc/sysdeps/linux/arc/sigaction.c
@@ -10,8 +10,13 @@
#include <sys/syscall.h>
#include <bits/kernel_sigaction.h>
-extern void __default_rt_sa_restorer(void);
-//libc_hidden_proto(__default_rt_sa_restorer);
+/*
+ * Default sigretrun stub if user doesn't specify SA_RESTORER
+ */
+static void __default_rt_sa_restorer(void)
+{
+ INTERNAL_SYSCALL_NCS(__NR_rt_sigreturn, , 0);
+}
#define SA_RESTORER 0x04000000
@@ -25,11 +30,6 @@ __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
/*
* SA_RESTORER is only relevant for act != NULL case
* (!act means caller only wants to know @oact)
- *
- * For the normal/default cases (user not providing SA_RESTORER) use
- * 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
*/
if (act && !(act->sa_flags & SA_RESTORER)) {
kact.sa_restorer = __default_rt_sa_restorer;
diff --git a/libc/sysdeps/linux/arc/sigrestorer.S b/libc/sysdeps/linux/arc/sigrestorer.S
deleted file mode 100644
index 24531d89d..000000000
--- a/libc/sysdeps/linux/arc/sigrestorer.S
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * 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)