[PATCH] Set unknown_syscall differently on arm linux

[Yao Qi <qiyaoltc@gmail.com>]

Currently, we use 123456789 as unknown or illegal syscall number, and
expect program return ENOSYS.  Although 123456789 is an illegal syscall
number on arm linux, kernel sends SIGILL rather than returns -ENOSYS.
However, arm linux kernel returns -ENOSYS if syscall number is within
0xf0001..0xf07ff, so we can use 0xf07ff for unknown_syscall in test.

gdb/testsuite:

2016-06-28  Yao Qi  <yao.qi@linaro.org>

	* gdb.base/catch-syscall.c [__arm__]: Set unknown_syscall to
	0x0f07ff.
---
 gdb/testsuite/gdb.base/catch-syscall.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gdb/testsuite/gdb.base/catch-syscall.c b/gdb/testsuite/gdb.base/catch-syscall.c
index 98222fa..2e3c5d1 100644
--- a/gdb/testsuite/gdb.base/catch-syscall.c
+++ b/gdb/testsuite/gdb.base/catch-syscall.c
@@ -28,7 +28,11 @@ int pipe_syscall = SYS_pipe;
 int pipe2_syscall = SYS_pipe2;
 #endif
 int write_syscall = SYS_write;
+#if defined(__arm__)
+int unknown_syscall = 0x0f07ff;
+#else
 int unknown_syscall = 123456789;
+#endif
 int exit_group_syscall = SYS_exit_group;
 
 /* Set by the test when it wants execve.  */
-- 
1.9.1