derek.holloway
7502bf64a4
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66 lines
2.3 KiB
Plaintext
66 lines
2.3 KiB
Plaintext
# Copyright 2021-2024 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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# Set a breakpoint on libc's _exit, and verify that it triggers. The function
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# tends to do a syscall immediately after the prologue, and if the breakpoint is
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# set past the syscall due to faulty prologue skipping, the breakpoint will not
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# trigger.
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#
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# In particular, we're trying to exercise the instruction analysis
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# functionality of prologue skipping. If the non-minimal symbols are
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# read for libc, then that functionality might not be used because f.i.
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# line-info is used instead. Also, if the minimal symbols are not read
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# for libc, then the breakpoint is set on the exec-local _exit@plt instead,
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# and that functionality will also not be used.
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#
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# We may get the required setup in case of a libc with misssing separate
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# debuginfo, but we want the same effect if that debuginfo is installed.
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#
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# So, we use -readnever to read minimal symbols, but not non-miminal symbols.
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#
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# Because the code at _exit may be and usually is optimized, the test is in
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# the gdb.opt directory.
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standard_testfile
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# See if we have target board readnow.exp or similar.
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if {[readnow]} {
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untested "--readnever not allowed in combination with --readnow"
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return -1
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}
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save_vars { GDBFLAGS } {
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append GDBFLAGS " -readnever"
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if {[prepare_for_testing "failed to prepare" $testfile $srcfile nodebug]} {
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return -1
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}
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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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gdb_breakpoint "_exit"
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# Give some background information about the breakpoint(s) and corresponding
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# the shared lib(s).
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gdb_test "info breakpoints"
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gdb_test "info shared"
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# If the skip_prologue analysis of _exit is too eager, we may not hit the
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# breakpoint.
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gdb_continue_to_breakpoint "_exit" "_exit \\(\\) .*"
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