2011-10-31 Pedro Alves <pedro@codesourcery.com>

gdb/gdbserver/
	* mem-break.c (check_mem_write): Add `myaddr' parameter.  Don't
	clobber the breakpoints' shadows with fast tracepoint jumps.
	* mem-break.h (check_mem_write): Add `myaddr' parameter.
	* target.c (write_inferior_memory): Also pass MYADDR down to
	check_mem_write.

	gdb/testsuite/
        * gdb.trace/trace-break.c: New.
        * gdb.trace/trace-break.exp: New.

gdb/gdbserver/ChangeLog

@@ -1,3 +1,11 @@
+2011-10-31  Pedro Alves  <pedro@codesourcery.com>
+
+	* mem-break.c (check_mem_write): Add `myaddr' parameter.  Don't
+	clobber the breakpoints' shadows with fast tracepoint jumps.
+	* mem-break.h (check_mem_write): Add `myaddr' parameter.
+	* target.c (write_inferior_memory): Also pass MYADDR down to
+	check_mem_write.
+
 2011-10-07  Ulrich Weigand  <ulrich.weigand@linaro.org>
 
 	* configure.ac: Check support for personality routine.

gdb/gdbserver/mem-break.c

@@ -1029,7 +1029,8 @@ check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)
 }
 
 void
-check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)
+check_mem_write (CORE_ADDR mem_addr, unsigned char *buf,
+		 const unsigned char *myaddr, int mem_len)
 {
   struct process_info *proc = current_process ();
   struct raw_breakpoint *bp = proc->raw_breakpoints;
@@ -1063,7 +1064,7 @@ check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)
       buf_offset = start - mem_addr;
 
       memcpy (fast_tracepoint_jump_shadow (jp) + copy_offset,
-	      buf + buf_offset, copy_len);
+	      myaddr + buf_offset, copy_len);
       if (jp->inserted)
 	memcpy (buf + buf_offset,
 		fast_tracepoint_jump_insn (jp) + copy_offset, copy_len);
@@ -1092,7 +1093,7 @@ check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)
       copy_offset = start - bp->pc;
       buf_offset = start - mem_addr;
 
-      memcpy (bp->old_data + copy_offset, buf + buf_offset, copy_len);
+      memcpy (bp->old_data + copy_offset, myaddr + buf_offset, copy_len);
       if (bp->inserted)
 	{
 	  if (validate_inserted_breakpoint (bp))

gdb/gdbserver/mem-break.h

@@ -102,9 +102,11 @@ void check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len);
 
 /* See if any breakpoints shadow the target memory area from MEM_ADDR
    to MEM_ADDR + MEM_LEN.  Update the data to be written to the target
-   (in BUF) if necessary, as well as the original data for any breakpoints.  */
+   (in BUF, a copy of MYADDR on entry) if necessary, as well as the
+   original data for any breakpoints.  */
 
-void check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len);
+void check_mem_write (CORE_ADDR mem_addr,
+		      unsigned char *buf, const unsigned char *myaddr, int mem_len);
 
 /* Set the byte pattern to insert for memory breakpoints.  This function
    must be called before any breakpoints are set.  */

gdb/gdbserver/target.c

@@ -63,7 +63,7 @@ write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
 
   buffer = xmalloc (len);
   memcpy (buffer, myaddr, len);
-  check_mem_write (memaddr, buffer, len);
+  check_mem_write (memaddr, buffer, myaddr, len);
   res = (*the_target->write_memory) (memaddr, buffer, len);
   free (buffer);
   buffer = NULL;

gdb/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2011-10-31  Yao Qi  <yao@codesourcery.com>
+	    Pedro Alves  <pedro@codesourcery.com>
+
+        * gdb.trace/trace-break.c: New.
+        * gdb.trace/trace-break.exp: New.
+
 2011-10-28  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	* gdb.threads/no-unwaited-for-left.exp: Specify $srcfile for

gdb/testsuite/gdb.trace/trace-break.c

@@ -0,0 +1,58 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2011 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef SYMBOL_PREFIX
+#define SYMBOL(str)     SYMBOL_PREFIX #str
+#else
+#define SYMBOL(str)     #str
+#endif
+
+/* Called from asm.  */
+static void __attribute__((used))
+func (void)
+{}
+
+static void
+marker (void)
+{
+  /* Some code to make sure `b marker' and `b set_point' set
+     breakpoints at different addresses.  */
+  int a = 0;
+  int b = a;
+
+  /* `set_point' is the label where we'll set multiple tracepoints and
+     breakpoints at.  The insn at the label must the large enough to
+     fit a fast tracepoint jump.  */
+  asm ("    .global " SYMBOL(set_point) "\n"
+       SYMBOL(set_point) ":\n"
+#if (defined __x86_64__ || defined __i386__)
+       "    call " SYMBOL(func) "\n"
+#endif
+       );
+}
+
+static void
+end (void)
+{}
+
+int
+main ()
+{
+  marker ();
+  end ();
+  return 0;
+}

gdb/testsuite/gdb.trace/trace-break.exp

@@ -0,0 +1,240 @@
+# Copyright 2011 Free Software Foundation, Inc.
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+load_lib "trace-support.exp";
+
+set testfile "trace-break"
+set executable $testfile
+set srcfile $testfile.c
+set binfile $objdir/$subdir/$testfile
+set expfile $testfile.exp
+
+# Some targets have leading underscores on assembly symbols.
+set additional_flags [gdb_target_symbol_prefix_flags]
+
+if [prepare_for_testing $expfile $executable $srcfile \
+	[list debug $additional_flags]] {
+    untested "failed to prepare for trace tests"
+    return -1
+}
+
+if ![runto_main] {
+    fail "Can't run to main to check for trace support"
+    return -1
+}
+
+if ![gdb_target_supports_trace] {
+    unsupported "target does not support trace"
+    return -1;
+}
+
+# Set breakpoint and tracepoint at the same address.
+
+proc break_trace_same_addr_1 { trace_type option } {
+    global executable
+    global pf_prefix
+    global hex
+
+    set old_pf_prefix $pf_prefix
+    set pf_prefix "$pf_prefix 1 $trace_type $option:"
+
+    # Start with a fresh gdb.
+    clean_restart ${executable}
+    if ![runto_main] {
+	fail "Can't run to main"
+	set pf_prefix $old_pf_prefix
+	return -1
+    }
+
+    gdb_test_no_output "set breakpoint always-inserted ${option}"
+
+    gdb_test "break end" "Breakpoint \[0-9\] at $hex: file.*"
+
+    gdb_test "break set_point" "Breakpoint \[0-9\] at $hex: file.*"
+    gdb_test "${trace_type} set_point" "\(Fast t|T\)racepoint \[0-9\] at $hex: file.*"
+
+    gdb_test_no_output "tstart"
+
+    gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*" "continue to set_point"
+
+    gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*" "continue to end"
+    gdb_test_no_output "tstop"
+
+    gdb_test "tfind" "Found trace frame 0, tracepoint .*" "tfind frame 0"
+    gdb_test "tfind" "Target failed to find requested trace frame\\..*"
+
+    set pf_prefix $old_pf_prefix
+}
+
+# Set multiple tracepoints at the same address.
+
+proc break_trace_same_addr_2 { trace_type1 trace_type2 option } {
+    global executable
+    global pf_prefix
+    global hex
+
+    set old_pf_prefix $pf_prefix
+    set pf_prefix "$pf_prefix 2 $trace_type1 $trace_type2 $option:"
+
+    # Start with a fresh gdb.
+    clean_restart ${executable}
+    if ![runto_main] {
+	fail "Can't run to main"
+	set pf_prefix $old_pf_prefix
+	return -1
+    }
+
+    gdb_test_no_output "set breakpoint always-inserted ${option}"
+
+    gdb_test "break end" "Breakpoint \[0-9\] at $hex: file.*"
+
+    gdb_test "${trace_type1} set_point" \
+	"\(Fast t|T\)racepoint \[0-9\] at $hex: file.*" \
+	"${trace_type1} set_point (1)"
+
+    gdb_test "${trace_type2} set_point" \
+	"\(Fast t|T\)racepoint \[0-9\] at $hex: file.*" \
+	"${trace_type2} set_point (2)"
+
+    gdb_test_no_output "tstart"
+    gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*" "continue to end"
+
+    gdb_test_no_output "tstop"
+
+    gdb_test "tfind" "Found trace frame 0, tracepoint .*" "tfind frame 0"
+    gdb_test "tfind" "Found trace frame 1, tracepoint .*" "tfind frame 1"
+    gdb_test "tfind" "Target failed to find requested trace frame\\..*"
+
+    set pf_prefix $old_pf_prefix
+}
+
+# Set breakpoint and tracepoint at the same address.  Delete breakpoint, and verify
+# that tracepoint still works.
+
+proc break_trace_same_addr_3 { trace_type option } {
+    global executable
+    global pf_prefix
+    global hex
+
+    set old_pf_prefix $pf_prefix
+    set pf_prefix "$pf_prefix 3 $trace_type $option:"
+
+    # Start with a fresh gdb.
+    clean_restart ${executable}
+    if ![runto_main] {
+	fail "Can't run to main"
+	set pf_prefix $old_pf_prefix
+	return -1
+    }
+
+    gdb_test_no_output "set breakpoint always-inserted ${option}"
+    gdb_test "break marker" "Breakpoint \[0-9\] at $hex: file.*"
+    gdb_test "break end" "Breakpoint \[0-9\] at $hex: file.*"
+
+    gdb_test "break set_point" "Breakpoint \[0-9\] at $hex: file.*"
+    gdb_test "${trace_type} set_point" "\(Fast t|T\)racepoint \[0-9\] at $hex: file.*"
+
+    gdb_test_no_output "tstart"
+
+    gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*" "continue to marker"
+    gdb_test "delete break 4"
+
+    gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*" "continue to end"
+    gdb_test_no_output "tstop"
+
+    gdb_test "tfind" "Found trace frame 0, tracepoint .*" "tfind frame 0"
+    gdb_test "tfind" "Target failed to find requested trace frame\\..*"
+
+    set pf_prefix $old_pf_prefix
+}
+
+# Set breakpoint and tracepoint at the same address.  Delete tracepoint, and verify
+# that breakpoint still works.
+
+proc break_trace_same_addr_4 { trace_type option } {
+    global executable
+    global pf_prefix
+    global hex
+
+    set old_pf_prefix $pf_prefix
+    set pf_prefix "$pf_prefix 4 $trace_type $option:"
+
+    # Start with a fresh gdb.
+    clean_restart ${executable}
+    if ![runto_main] {
+	fail "Can't run to main"
+	set pf_prefix $old_pf_prefix
+	return -1
+    }
+
+    gdb_test_no_output "set breakpoint always-inserted ${option}"
+    gdb_test "break marker" "Breakpoint \[0-9\] at $hex: file.*"
+    gdb_test "break end" "Breakpoint \[0-9\] at $hex: file.*"
+
+    gdb_test "break set_point" "Breakpoint \[0-9\] at $hex: file.*"
+    gdb_test "${trace_type} set_point" "\(Fast t|T\)racepoint \[0-9\] at $hex: file.*"
+
+    gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*" "continue to marker"
+    # Delete tracepoint set on set_point.
+    gdb_test "delete trace 5"
+
+    gdb_test "tstart" "No tracepoints defined, not starting trace.*"
+
+    gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*" "continue to set_point"
+    gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*" "continue to end"
+    gdb_test "tstop" "Trace is not running.*"
+
+    gdb_test "tfind" "Target failed to find requested trace frame\\..*"
+
+    set pf_prefix $old_pf_prefix
+}
+
+foreach break_always_inserted { "on" "off" } {
+    break_trace_same_addr_1 "trace" ${break_always_inserted}
+    break_trace_same_addr_2 "trace" "trace" ${break_always_inserted}
+    break_trace_same_addr_3 "trace" ${break_always_inserted}
+    break_trace_same_addr_4 "trace" ${break_always_inserted}
+}
+
+set libipa $objdir/../gdbserver/libinproctrace.so
+gdb_load_shlibs $libipa
+
+# Can't use prepare_for_testing, because that splits compiling into
+# building objects and then linking, and we'd fail with "linker input
+# file unused because linking not done" when building the object.
+
+if { [gdb_compile "$srcdir/$subdir/$srcfile" $binfile \
+	  executable [list debug $additional_flags shlib=$libipa] ] != "" } {
+    untested "failed to compile ftrace tests"
+    return -1
+}
+clean_restart ${executable}
+
+if ![runto_main] {
+    fail "Can't run to main for ftrace tests"
+    return 0
+}
+
+gdb_reinitialize_dir $srcdir/$subdir
+if { [gdb_test "info sharedlibrary" ".*libinproctrace\.so.*" "IPA loaded"] != 0 } {
+    untested "Could not find IPA lib loaded"
+} else {
+    foreach break_always_inserted { "on" "off" } {
+	break_trace_same_addr_1 "ftrace" ${break_always_inserted}
+	break_trace_same_addr_2 "trace" "ftrace" ${break_always_inserted}
+	break_trace_same_addr_2 "ftrace" "trace" ${break_always_inserted}
+	break_trace_same_addr_3 "ftrace" ${break_always_inserted}
+	break_trace_same_addr_4 "ftrace" ${break_always_inserted}
+    }
+}