CORE_ADDR addr, unsigned len_rw_bits)
{
int i, retval = -1;
+ int all_vacant = 1;
ALL_DEBUG_REGISTERS (i)
{
/* Reset our mirror. */
state->dr_mirror[i] = 0;
I386_DR_DISABLE (state, i);
+ /* Even though not strictly necessary, clear out all
+ bits in DR_CONTROL related to this debug register.
+ Debug output is clearer when we don't have stale bits
+ in place. This also allows the assertion below. */
+ I386_DR_SET_RW_LEN (state, i, 0);
}
retval = 0;
}
+
+ if (!I386_DR_VACANT (state, i))
+ all_vacant = 0;
}
+ if (all_vacant)
+ {
+ /* Even though not strictly necessary, clear out all of
+ DR_CONTROL, so that when we have no debug registers in use,
+ we end up with DR_CONTROL == 0. The Linux support relies on
+ this for an optimization. Plus, it makes for clearer debug
+ output. */
+ state->dr_control_mirror &= ~DR_LOCAL_SLOWDOWN;
+
+ gdb_assert (state->dr_control_mirror == 0);
+ }
return retval;
}
--- /dev/null
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2014 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/>. */
+
+union aligned_buf
+{
+ char byte[12];
+
+ /* So that testing consistently starts on an aligned address. */
+ unsigned long long force_align;
+};
+
+union aligned_buf buf;
+
+int
+main (void)
+{
+ volatile int i = 0;
+
+ /* Must be a single line. */
+ for (i = 0; i < 100000; i++); /* stepi line */
+
+ return 0;
+}
--- /dev/null
+# Copyright 2014 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/>.
+
+# Test alternating between watchpoint types, watching a sliding window
+# of addresses (thus alternating between aligned and unaligned
+# addresses). Only a single watchpoint exists at any given time. On
+# targets that only update the debug registers on resume, this
+# stresses the debug register setup code, both in GDB and in the
+# target/kernel as one watchpoint replaces the other in a single
+# operation. (Note that we don't have any of these watchpoints
+# trigger.)
+
+if [target_info exists gdb,no_hardware_watchpoints] {
+ unsupported "no target support"
+ return
+}
+
+standard_testfile
+
+if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
+ return -1
+}
+
+if ![runto_main] then {
+ fail "Can't run to main"
+ return 0
+}
+
+# The line we'll be stepping.
+set srcline [gdb_get_line_number "stepi line"]
+
+# The address the program is stopped at currently.
+set cur_addr ""
+
+# Get the current PC.
+
+proc get_pc {} {
+ global hex gdb_prompt
+
+ set addr ""
+ set test "get PC"
+ gdb_test_multiple "p /x \$pc" "$test" {
+ -re " = ($hex).*$gdb_prompt $" {
+ set addr $expect_out(1,string)
+ pass "$test"
+ }
+ }
+
+ return $addr
+}
+
+
+# Issue a stepi, and make sure the program advanced past the current
+# instruction (stored in the CUR_ADDR global).
+
+proc stepi {} {
+ global hex gdb_prompt cur_addr
+
+ set srcline " for (i = 0; i < 100000; i++); /* stepi line */"
+ set test "stepi advanced"
+ gdb_test_multiple "stepi" $test {
+ -re "($hex).*[string_to_regexp $srcline]\r\n$gdb_prompt $" {
+ set addr $expect_out(1,string)
+ if {$addr != $cur_addr} {
+ pass $test
+ } else {
+ fail $test
+ }
+ set cur_addr addr
+ }
+ }
+}
+
+gdb_breakpoint $srcline
+gdb_continue_to_breakpoint "stepi line"
+
+# The test tries various sequences of different types of watchpoints.
+# Probe for support first.
+
+# So we get an immediate warning/error if the target doesn't support a
+# given watchpoint type.
+gdb_test_no_output "set breakpoint always-inserted on"
+
+# The list of supported commands. Below we'll probe for support and
+# add elements to this list.
+set cmds {}
+
+foreach cmd {"watch" "awatch" "rwatch"} {
+ set test $cmd
+ gdb_test_multiple "$cmd buf.byte\[0\]" $test {
+ -re "You may have requested too many.*$gdb_prompt $" {
+ unsupported $test
+ }
+ -re "$gdb_prompt $" {
+ pass $test
+ lappend cmds $cmd
+ }
+ }
+
+ delete_breakpoints
+}
+
+set test "hbreak"
+gdb_test_multiple "hbreak main" $test {
+ -re "You may have requested too many.*$gdb_prompt $" {
+ pass $test
+ }
+ -re "$gdb_prompt $" {
+ pass $test
+ lappend cmds "hbreak"
+ }
+}
+
+delete_breakpoints
+
+set cur_addr [get_pc]
+
+# Watch WIDTH bytes at BASE + OFFSET. CMD specifices the specific
+# type of watchpoint to use. If CMD is "hbreak", WIDTH is ignored.
+
+proc watch_command {cmd base offset width} {
+ global srcfile srcline hex
+
+ if {$cmd == "hbreak"} {
+ set expr "*(buf.byte + $base + $offset)"
+ gdb_test "hbreak $expr" "Hardware assisted breakpoint \[0-9\]+ at $hex"
+ } elseif {$cmd == "watch"} {
+ set expr "*(buf.byte + $base + $offset)@$width"
+ gdb_test "$cmd $expr" \
+ "Hardware watchpoint \[0-9\]+: [string_to_regexp $expr]"
+ } elseif {$cmd == "awatch"} {
+ set expr "*(buf.byte + $base + $offset)@$width"
+ gdb_test "$cmd $expr" \
+ "Hardware access \\(read/write\\) watchpoint \[0-9\]+: [string_to_regexp $expr]"
+ } elseif {$cmd == "rwatch"} {
+ set expr "*(buf.byte + $base + $offset)@$width"
+ gdb_test "$cmd $expr" \
+ "Hardware read watchpoint \[0-9\]+: [string_to_regexp $expr]"
+ }
+}
+
+# Run test proper. See intro for description.
+
+foreach always_inserted {"off" "on" } {
+ gdb_test_no_output "set breakpoint always-inserted $always_inserted"
+ foreach cmd1 $cmds {
+ foreach cmd2 $cmds {
+ for {set width 1} {$width < 4} {incr width} {
+
+ if {$cmd1 == "hbreak" && $cmd2 == "hbreak" && $width > 1} {
+ # hbreak ignores WIDTH, no use testing more than
+ # once.
+ continue
+ }
+
+ for {set x 0} {$x < 4} {incr x} {
+ set prefix "always-inserted $always_inserted: "
+ append prefix "$cmd1 x $cmd2: "
+ with_test_prefix "$prefix: width $width, iter $x" {
+ with_test_prefix "base + 0" {
+ watch_command $cmd1 $x 0 $width
+ stepi
+ gdb_test_no_output "delete \$bpnum"
+ }
+ with_test_prefix "base + 1" {
+ watch_command $cmd2 $x 1 $width
+ stepi
+ gdb_test_no_output "delete \$bpnum"
+ }
+ }
+ }
+ }
+ }
+ }
+}
projects / binutils-gdb.git / commitdiff