gdb/

	Fix memory access from signed 32bit inferior registers on 64bit GDB.
	* linux-nat.c (linux_xfer_partial <TARGET_OBJECT_MEMORY>): New variable
	addr_bit.  Mask OFFSET by the ADDR_BIT width.

gdb/testsuite/
	* gdb.arch/amd64-i386-address.exp, gdb.arch/amd64-i386-address.S: New.

2 files changed, 67 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.arch/amd64-i386-address.S b/gdb/testsuite/gdb.arch/amd64-i386-address.S
new file mode 100644
index 0000000..edec656
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-i386-address.S
@@ -0,0 +1,24 @@
+/* Copyright 2009 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/>.
+
+   This file is part of the gdb testsuite.  */
+
+_start:	.globl	_start
+	movl	$0xdeadf00d, %eax
+	pushl	%eax
+	movl	%esp, %ebx
+	int3
+	nop
+	nop
diff --git a/gdb/testsuite/gdb.arch/amd64-i386-address.exp b/gdb/testsuite/gdb.arch/amd64-i386-address.exp
new file mode 100644
index 0000000..22ede09
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-i386-address.exp
@@ -0,0 +1,43 @@
+# Copyright 2009 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/>.
+
+# This file is part of the gdb testsuite.
+
+# Test UNsigned extension of the 32-bit inferior address on a 64-bit host.
+# On native 32-bit host the test always PASSed.
+
+if {![istarget "x86_64-*-*"] && ![istarget "i?86-*-*"]} then {
+    verbose "Skipping amd64->i386 adress test."
+    return
+}
+
+if [prepare_for_testing amd64-i386-address.exp amd64-i386-address amd64-i386-address.S [list debug "additional_flags=-m32 -nostdlib"]] {
+    return -1
+}
+
+gdb_run_cmd
+
+set test "trap stop"
+gdb_test_multiple "" $test {
+    -re "Program received signal SIGTRAP,.*_start .*$gdb_prompt $" {
+	pass $test
+    }
+}
+
+gdb_test "x/wx \$esp" "0x\[0-9a-f\]*:\t0xdeadf00d"
+
+# Failure case would be:
+# 	0xff8d7f00:     Cannot access memory at address 0xff8d7f00
+gdb_test "x/wx \$ebx" "0x\[0-9a-f\]*:\t0xdeadf00d"