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# 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 $test
}
-re "Target does not support.*$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 $" {
unsupported $test
}
-re "No hardware breakpoint support.*$gdb_prompt $" {
unsupported $test
}
-re "$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"
}
}
}
}
}
}
}
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