[PATCH 3/3] Add gdb remote protocol handling to strace

[Stan Cox]

Add a test:  gdbrsp.c and a test driver gdbrsp.test.  The test checks if 
gdbserver is available and if it supports syscall catching.


diff --git a/tests/Makefile.am b/../src/tests/Makefile.am
index 90b7bf3..2c059e4 100644
--- a/tests/Makefile.am
+++ b/../src/tests/Makefile.am
@@ -143,7 +143,6 @@ check_PROGRAMS = \
         ftruncate64 \
         futex \
         futimesat \
-       gdbrsp \
         get_mempolicy \
         getcpu \
         getcwd \
@@ -547,7 +546,6 @@ DECODER_TESTS = \
         ftruncate64.test \
         futex.test \
         futimesat.test \
-       gdbrsp.test \
         get_mempolicy.test \
         getcpu.test \
         getcwd.test \

diff --git a/tests/gdbrsp.c b/tests/gdbrsp.c
new file mode 100644
index 0000000..f39a7c9
--- /dev/null
+++ b/tests/gdbrsp.c
@@ -0,0 +1,79 @@
+/* This file is used to test the 'catch syscall' feature on GDB.
+
+   Please, if you are going to edit this file DO NOT change the syscalls
+   being called (nor the order of them).  If you really must do this, then
+   take a look at catch-syscall.exp and modify there too.
+
+   Written by Sergio Durigan Junior <sergiodj at linux.vnet.ibm.com>
+   September, 2008
+
+   This is the gdb catch-syscall.c test */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sched.h>
+
+/* These are the syscalls numbers used by the test.  */
+
+int close_syscall = SYS_close;
+int chroot_syscall = SYS_chroot;
+/* GDB had a bug where it couldn't catch syscall number 0 (PR 16297).
+   In most GNU/Linux architectures, syscall number 0 is
+   restart_syscall, which can't be called from userspace.  However,
+   the "read" syscall is zero on x86_64.  */
+int read_syscall = SYS_read;
+#ifdef SYS_pipe
+int pipe_syscall = SYS_pipe;
+#else
+int pipe2_syscall = SYS_pipe2;
+#endif
+int write_syscall = SYS_write;
+#if defined(__arm__)
+/* Although 123456789 is an illegal syscall umber 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.  */
+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.  */
+int do_execve = 0;
+
+int
+main (int argc, char *const argv[])
+{
+	int fd[2];
+	char buf1[2] = "a";
+	char buf2[2];
+
+	/* Test a simple self-exec, but only on request.  */
+	if (do_execve)
+	  execv (*argv, argv);
+
+	/* A close() with a wrong argument.  We are only
+	   interested in the syscall.  */
+	close (-1);
+
+	chroot (".");
+
+	pipe (fd);
+
+	write (fd[1], buf1, sizeof (buf1));
+	read (fd[0], buf2, sizeof (buf2));
+
+	/* Test vfork-event interactions.  Child exits immediately.
+	   (Plain fork won't work on no-mmu kernel configurations.)  */
+	if (vfork () == 0)
+	  _exit (0);
+
+	/* Trigger an intentional ENOSYS.  */
+	syscall (unknown_syscall);
+
+	/* The last syscall.  Do not change this.  */
+	_exit (0);
+}


diff --git a/tests/gdbrsp.test b/tests/gdbrsp.test
new file mode 100755
index 0000000..9f8767e
--- /dev/null
+++ b/tests/gdbrsp.test
@@ -0,0 +1,65 @@
+#!/bin/sh
+#
+# Check -G option: gdb remote serial protocol
+#
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. The name of the author may not be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+. "${srcdir=.}/init.sh"
+
+check_prog gdb
+check_prog gdbserver
+
+gdb -batch -iex 'target remote | gdbserver --remote-debug - 
/usr/bin/true' >| /tmp/,gdb 2>&1
+if grep QCatchSyscalls /tmp/,gdb > /dev/null
+then :
+else framework_skip_ "Correct version of gdbserver is not available"
+fi
+
+run_prog > /dev/null
+
+gdbserver --once --multi :65432 &
+if [ $? -gt 0 ] ; then
+    framework_skip_ "Unable to start gdbserver"
+fi
+$STRACE -G localhost:65432 $(readlink -f ./gdbrsp) >& $LOG
+
+EXPECTED="$LOG.expected"
+cat > "$EXPECTED" << __EOF__
+close.-1..* = -1 EBADF .Bad file descriptor.
+chroot.* = -1 EPERM .Operation not permitted.*
+pipe..3, 4...* = 0
+write.4, "a.0", 2..* = 2
+read.3, "a.0", 2..* = 2
+vfork.*unfinished.*
+.pid.*exited with 0.*
+.pid.*vfork resumed.* =.*
+__EOF__
+
+match_grep "$LOG" "$EXPECTED"
+rm -f $EXPECTED
+
+exit 0
+
+