mirror of
https://sourceware.org/git/binutils-gdb.git
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252 lines
6.8 KiB
Plaintext
252 lines
6.8 KiB
Plaintext
# Copyright 2014-2018 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test alternating between watchpoint types, watching a sliding window
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# of addresses (thus alternating between aligned and unaligned
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# addresses). Only a single watchpoint exists at any given time. On
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# targets that only update the debug registers on resume, this
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# stresses the debug register setup code, both in GDB and in the
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# target/kernel as one watchpoint replaces the other in a single
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# operation. (Note that we don't have any of these watchpoints
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# trigger.)
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if [target_info exists gdb,no_hardware_watchpoints] {
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unsupported "no target support"
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return
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}
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standard_testfile
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if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
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return -1
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}
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if ![runto_main] then {
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fail "can't run to main"
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return 0
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}
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# The line we'll be stepping.
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set srcline [gdb_get_line_number "stepi line"]
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# The address the program is stopped at currently.
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set cur_addr ""
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# Get the current PC.
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proc get_pc {} {
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global hex gdb_prompt
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set addr ""
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set test "get PC"
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gdb_test_multiple "p /x \$pc" "$test" {
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-re " = ($hex).*$gdb_prompt $" {
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set addr $expect_out(1,string)
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pass "$test"
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}
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}
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return $addr
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}
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# Issue a stepi, and make sure the program advanced past the current
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# instruction (stored in the CUR_ADDR global).
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proc stepi {} {
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global hex gdb_prompt cur_addr
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set srcline " for (i = 0; i < 100000; i++); /* stepi line */"
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set test "stepi advanced"
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gdb_test_multiple "stepi" $test {
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-re "($hex).*[string_to_regexp $srcline]\r\n$gdb_prompt $" {
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set addr $expect_out(1,string)
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if {$addr != $cur_addr} {
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pass $test
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} else {
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fail $test
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}
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set cur_addr addr
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}
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}
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}
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gdb_breakpoint $srcline
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gdb_continue_to_breakpoint "stepi line"
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# The test tries various sequences of different types of watchpoints.
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# Probe for support first.
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# So we get an immediate warning/error if the target doesn't support a
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# given watchpoint type.
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gdb_test_no_output "set breakpoint always-inserted on"
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# The list of supported commands. Below we'll probe for support and
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# add elements to this list.
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set cmds {}
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foreach cmd {"watch" "awatch" "rwatch"} {
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set test $cmd
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gdb_test_multiple "$cmd buf.byte\[0\]" $test {
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-re "You may have requested too many.*$gdb_prompt $" {
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unsupported $test
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}
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-re "Target does not support.*$gdb_prompt $" {
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unsupported $test
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}
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-re "$gdb_prompt $" {
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pass $test
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lappend cmds $cmd
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}
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}
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delete_breakpoints
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}
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set test "hbreak"
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gdb_test_multiple "hbreak main" $test {
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-re "You may have requested too many.*$gdb_prompt $" {
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unsupported $test
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}
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-re "No hardware breakpoint support.*$gdb_prompt $" {
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unsupported $test
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}
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-re "$gdb_prompt $" {
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pass $test
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lappend cmds "hbreak"
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}
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}
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delete_breakpoints
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set cur_addr [get_pc]
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# Return true if the memory range [buf.byte + OFFSET, +WIDTH] can be
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# monitored by CMD, otherwise return false.
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proc valid_addr_p {cmd offset width} {
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if { [istarget "aarch64*-*-linux*"] } {
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# The aarch64 Linux kernel port only accepts 4-byte aligned addresses
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# for hardware breakpoints and 8-byte aligned addresses for hardware
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# watchpoints. However, both GDB and GDBserver support unaligned
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# watchpoints by using more than one properly aligned watchpoint
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# registers to represent the whole unaligned region. Breakpoint
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# addresses must still be aligned though.
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if {$cmd == "hbreak" } {
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if { [expr ($offset) % 4] != 0 } {
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return 0
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}
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}
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} elseif { [istarget "arm*-*-linux*"] } {
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if { $cmd == "hbreak" } {
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# Breakpoints must be of length 2 (thumb) or 4 (ARM) bytes.
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if { $width != 2 && $width != 4 } {
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return 0
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}
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} else {
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# Watchpoints can be of length 1, 2, 4 or 8 bytes.
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if { [expr $width % 2] != 0 } {
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return 0
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}
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}
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if { [expr ($offset) % 8] == 0 && $width == 8 } {
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# If WIDTH is 8 byte, the address should be 8-byte aligned.
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return 1
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} elseif { [expr ($offset) % 4] == 0 } {
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return 1
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} elseif { [expr ($offset) % 4] == 2 && $width == 2 } {
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# Halfword watchpoints and breakpoints.
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return 1
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} elseif { [expr ($offset) % 4] == 1 && $width == 1 && $cmd != "hbreak" } {
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# Single byte watchpoints.
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return 1
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} else {
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return 0
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}
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}
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return 1
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}
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# Watch WIDTH bytes at BASE + OFFSET. CMD specifices the specific
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# type of watchpoint to use. If CMD is "hbreak", WIDTH is ignored.
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proc watch_command {cmd base offset width} {
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global srcfile srcline hex
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if {$cmd == "hbreak"} {
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set expr "*(buf.byte + $base + $offset)"
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gdb_test "hbreak $expr" "Hardware assisted breakpoint \[0-9\]+ at $hex"
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} elseif {$cmd == "watch"} {
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set expr "*(buf.byte + $base + $offset)@$width"
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gdb_test "$cmd $expr" \
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"Hardware watchpoint \[0-9\]+: [string_to_regexp $expr]"
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} elseif {$cmd == "awatch"} {
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set expr "*(buf.byte + $base + $offset)@$width"
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gdb_test "$cmd $expr" \
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"Hardware access \\(read/write\\) watchpoint \[0-9\]+: [string_to_regexp $expr]"
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} elseif {$cmd == "rwatch"} {
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set expr "*(buf.byte + $base + $offset)@$width"
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gdb_test "$cmd $expr" \
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"Hardware read watchpoint \[0-9\]+: [string_to_regexp $expr]"
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}
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}
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# Run test proper. See intro for description.
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foreach always_inserted {"off" "on" } {
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gdb_test_no_output "set breakpoint always-inserted $always_inserted"
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foreach cmd1 $cmds {
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foreach cmd2 $cmds {
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for {set width 1} {$width < 4} {incr width} {
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if {$cmd1 == "hbreak" && $cmd2 == "hbreak" && $width > 1} {
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# hbreak ignores WIDTH, no use testing more than
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# once.
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continue
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}
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for {set x 0} {$x < 4} {incr x} {
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if { ![valid_addr_p $cmd1 $x $width]
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|| ![valid_addr_p $cmd2 $x+1 $width] } {
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# Skip tests if requested address or length
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# of breakpoint or watchpoint don't meet
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# target or kernel requirements.
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continue
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}
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set prefix "always-inserted $always_inserted: "
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append prefix "$cmd1 x $cmd2: "
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with_test_prefix "$prefix: width $width, iter $x" {
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with_test_prefix "base + 0" {
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watch_command $cmd1 $x 0 $width
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stepi
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gdb_test_no_output "delete \$bpnum"
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}
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with_test_prefix "base + 1" {
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watch_command $cmd2 $x 1 $width
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stepi
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gdb_test_no_output "delete \$bpnum"
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}
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}
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}
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}
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}
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}
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}
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