derek.holloway
7502bf64a4
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68 lines
2.5 KiB
Plaintext
68 lines
2.5 KiB
Plaintext
# Copyright 2023-2024 Free Software Foundation, Inc.
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#
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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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# Ask GDB to watch a large structure before the inferior has started,
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# GDB will assume it can place a hardware watchpoint.
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#
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# Once the inferior starts GDB realises that it is not able to watch
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# such a large structure and downgrades to a software watchpoint.
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#
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# This test checks that GDB emits a warnings about this downgrade, as
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# a software watchpoint will be significantly slower than a hardware
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# watchpoint, and the user probably wants to know about this.
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require target_can_use_run_cmd is_x86_64_m64_target
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# The remote/extended-remote target has its own set of flags to
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# control the use of s/w vs h/w watchpoints, this test isn't about
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# those, so skip the test in these cases.
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if {[target_info gdb_protocol] == "remote"
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|| [target_info gdb_protocol] == "extended-remote"} {
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unsupported "using [target_info gdb_protocol] protocol"
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return -1
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}
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standard_testfile
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if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
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{ debug }] } {
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return -1
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}
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# Insert the watchpoint, it should default to a h/w watchpoint.
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gdb_test "watch global_var" \
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"Hardware watchpoint $decimal: global_var"
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set num [get_integer_valueof "\$bpnum" "*UNKNOWN*" \
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"get watchpoint number"]
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# Watchpoint should initially show as a h/w watchpoint.
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gdb_test "info watchpoints" \
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"\r\n$num\\s+hw watchpoint\\s+keep\\s+y\\s+global_var" \
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"check info watchpoints before starting"
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# Start the inferior, GDB should emit a warning that the watchpoint
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# type has changed.
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gdb_test "starti" \
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[multi_line \
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"warning: watchpoint $num downgraded to software watchpoint" \
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"" \
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"Program stopped\\." \
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".*"]
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# Watchpoint should now have downgraded to a s/w watchpoint.
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gdb_test "info watchpoints" \
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"\r\n$num\\s+watchpoint\\s+keep\\s+y\\s+global_var" \
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"check info watchpoints after starting"
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