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d82e5429b5
This changes skip_python_tests to invert the sense, and renames it to allow_python_tests.
97 lines
4.0 KiB
Plaintext
97 lines
4.0 KiB
Plaintext
# Copyright (C) 2021-2023 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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# Setup an unwinder that uses gdb.UnwindInfo.add_saved_register with
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# the register's 'pc' and 'sp'. On some (all?) targets, these
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# registers are implemented as user-registers, and so can't normally
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# be written to directly.
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#
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# The Python unwinder now includes code similar to how the expression
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# evaluator would handle something like 'set $pc=0x1234', we fetch the
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# value of '$pc', and then use the value's location to tell us which
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# register to write to.
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#
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# The unwinder defined here deliberately breaks the unwind by setting
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# the unwound $pc and $sp to be equal to the current frame's $pc and
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# $sp. GDB will spot this as a loop in the backtrace and terminate
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# the unwind.
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#
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# However, by the time the unwind terminates we have already shown
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# that it is possible to call add_saved_register with a user-register,
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# so the test is considered passed.
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#
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# For completeness this test checks two cases, calling
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# add_saved_register with a gdb.RegisterDescriptor and calling
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# add_saved_register with a string containing the register name.
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load_lib gdb-python.exp
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require allow_python_tests
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standard_testfile
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if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
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return -1
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}
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if {![runto_main]} {
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return 0
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}
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set pyfile [gdb_remote_download host ${srcdir}/${subdir}/${testfile}.py]
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gdb_breakpoint [gdb_get_line_number "Break here"]
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gdb_continue_to_breakpoint "stop at test breakpoint"
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# Load the script containing the unwinders. There are actually two
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# unwinders defined here that will catch the same function, so we
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# immediately disable one of the unwinders.
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gdb_test_no_output "source ${pyfile}"\
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"import python scripts"
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gdb_test "disable unwinder global \"break unwinding using strings\"" \
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"1 unwinder disabled" "disable the unwinder that uses strings"
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# At this point we are using the unwinder that passes a
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# gdb.RegisterDescriptor to add_saved_register.
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gdb_test_sequence "bt" "Backtrace corrupted by descriptor based unwinder" {
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"\\r\\n#0 \[^\r\n\]* foo \\(\\) at "
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"\\r\\n#1 \[^\r\n\]* bar \\(\\) at "
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"Backtrace stopped: previous frame inner to this frame \\(corrupt stack\\?\\)"
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}
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# Disable the unwinder that calls add_saved_register with a
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# gdb.RegisterDescriptor, and enable the unwinder that calls
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# add_saved_register with a string (containing the register name).
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gdb_test "disable unwinder global \"break unwinding using descriptors\"" \
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"1 unwinder disabled" "disable the unwinder that uses descriptors"
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gdb_test "enable unwinder global \"break unwinding using strings\"" \
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"1 unwinder enabled" "enable the unwinder that uses strings"
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gdb_test_sequence "bt" "Backtrace corrupted by string based unwinder" {
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"\\r\\n#0 \[^\r\n\]* foo \\(\\) at "
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"\\r\\n#1 \[^\r\n\]* bar \\(\\) at "
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"Backtrace stopped: previous frame inner to this frame \\(corrupt stack\\?\\)"
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}
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# Just for completeness, disable the string unwinder again (neither of
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# our special unwinders are now enabled), and check the backtrace. We
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# now get the complete stack back to main.
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gdb_test "disable unwinder global \"break unwinding using strings\"" \
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"1 unwinder disabled" "disable the unwinder that uses strings again"
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gdb_test_sequence "bt" "Backtrace not corrupted when using no unwinder" {
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"\\r\\n#0 \[^\r\n\]* foo \\(\\) at "
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"\\r\\n#1 \[^\r\n\]* bar \\(\\) at "
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"\\r\\n#2 \[^\r\n\]* main \\(\\) at "
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}
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