gdb/testsuite/
Test STT_GNU_IFUNC support. * gdb.base/gnu-ifunc-lib.c: New file. * gdb.base/gnu-ifunc.c: New file. * gdb.base/gnu-ifunc.exp: New file.
This commit is contained in:
Jan Kratochvil
parent
0e30163f12
commit
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2011-03-28 Jan Kratochvil <jan.kratochvil@redhat.com>
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Test STT_GNU_IFUNC support.
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* gdb.base/gnu-ifunc-lib.c: New file.
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* gdb.base/gnu-ifunc.c: New file.
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* gdb.base/gnu-ifunc.exp: New file.
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2011-03-28 Jan Kratochvil <jan.kratochvil@redhat.com>
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Support a ring of related breakpoints.
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@ -0,0 +1,33 @@
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/* This testcase is part of GDB, the GNU debugger.
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Copyright 2009, 2010, 2011 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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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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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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extern volatile int gnu_ifunc_initialized;
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extern int init_stub (int arg);
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extern int final (int arg);
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typedef int (*final_t) (int arg);
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asm (".type gnu_ifunc, @gnu_indirect_function");
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final_t
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gnu_ifunc (void)
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{
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if (! gnu_ifunc_initialized)
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return init_stub;
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else
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return final;
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}
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/* This testcase is part of GDB, the GNU debugger.
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Copyright 2009, 2010, 2011 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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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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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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#include <assert.h>
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int
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init_stub (int arg)
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{
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return 0;
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}
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int
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final (int arg)
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{
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return arg + 1;
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}
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/* Make differentiation of how the gnu_ifunc call resolves before and after
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calling gnu_ifunc_pre. This ensures the resolved function address is not
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being cached anywhere for the debugging purposes. */
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volatile int gnu_ifunc_initialized;
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static void
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gnu_ifunc_pre (void)
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{
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assert (!gnu_ifunc_initialized);
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gnu_ifunc_initialized = 1;
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}
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extern int gnu_ifunc (int arg);
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int
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main (void)
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{
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int i;
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gnu_ifunc_pre ();
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i = gnu_ifunc (1); /* break-at-call */
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assert (i == 2);
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gnu_ifunc (2); /* break-at-nextcall */
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return 0; /* break-at-exit */
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}
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# Copyright (C) 2009, 2010, 2011 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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if {[skip_shlib_tests]} {
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return 0
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}
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set testfile "gnu-ifunc"
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set executable ${testfile}
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set srcfile ${testfile}.c
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set binfile ${objdir}/${subdir}/${executable}
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set staticexecutable ${executable}-static
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set staticbinfile ${objdir}/${subdir}/${staticexecutable}
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set libfile "${testfile}-lib"
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set libsrc ${libfile}.c
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set lib_so ${objdir}/${subdir}/${libfile}.so
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# $lib_o must not have {debug}, it would override the STT_GNU_IFUNC ELF markers.
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set lib_o ${objdir}/${subdir}/${libfile}.o
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# We need DWARF for the "final" function as we "step" into the function and GDB
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# would step-over the "final" function if there would be no line number debug
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# information (DWARF) available.
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#
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# We must not have DWARF for the "gnu_ifunc" function as DWARF has no way to
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# express the STT_GNU_IFUNC type and it would be considered as a regular
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# function due to DWARF by GDB. In ELF gnu-ifunc is expressed by the
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# STT_GNU_IFUNC type.
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#
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# Both functions need to be in the same shared library file but
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# gdb_compile_shlib has no way to specify source-specific compilation options.
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#
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# Therefore $libfile contains only the STT_GNU_IFUNC function with no DWARF
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# referencing all the other parts from the main executable with DWARF.
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set lib_opts {}
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set exec_opts [list debug shlib=$lib_so]
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if [get_compiler_info ${binfile}] {
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return -1
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}
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if { [gdb_compile_shlib ${srcdir}/${subdir}/$libsrc $lib_so $lib_opts] != ""
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|| [gdb_compile ${srcdir}/${subdir}/$srcfile $binfile executable $exec_opts] != ""} {
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untested "Could not compile dynamic executable $binfile."
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return -1
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}
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# Start with a fresh gdb.
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clean_restart $executable
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gdb_load_shlibs ${lib_so}
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if ![runto_main] then {
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fail "Can't run to main"
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return 1;
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}
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# The "if" condition is artifical to test regression of a former patch.
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gdb_breakpoint "[gdb_get_line_number "break-at-nextcall"] if i && gnu_ifunc (i) != 42"
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gdb_breakpoint [gdb_get_line_number "break-at-call"]
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gdb_continue_to_breakpoint "break-at-call" ".*break-at-call.*"
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# Test GDB will automatically indirect the call.
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gdb_test "p gnu_ifunc (3)" " = 4"
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# Test GDB will skip the gnu_ifunc resolver on first call.
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gdb_test "step" "\r\nfinal .*"
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# Test GDB will not break before the final chosen implementation.
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# Also test a former patch regression:
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# Continuing.
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# Error in testing breakpoint condition:
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# Attempt to take address of value not located in memory.
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#
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# Breakpoint 2, main () at ./gdb.base/gnu-ifunc.c:33
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gdb_test "continue" "Continuing.\r\n\r\nBreakpoint .* (at|in) .*break-at-nextcall.*" \
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"continue to break-at-nextcall"
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gdb_breakpoint "gnu_ifunc"
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gdb_continue_to_breakpoint "nextcall gnu_ifunc"
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gdb_test "frame" "#0 +(0x\[0-9a-f\]+ in +)?final \\(.*" "nextcall gnu_ifunc skipped"
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# Check any commands not doing an inferior call access the address of the
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# STT_GNU_IFUNC resolver, not the target function.
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if {[istarget powerpc64-*] && [is_lp64_target]} {
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# With only minimal symbols GDB provides the function descriptors. With
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# full debug info the function code would be displayed.
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set func_prefix {\.}
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} else {
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set func_prefix {}
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}
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gdb_test "p gnu_ifunc" " = {<text gnu-indirect-function variable, no debug info>} 0x\[0-9a-f\]+ <${func_prefix}gnu_ifunc>" "p gnu_ifunc executing"
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gdb_test "info sym gnu_ifunc" "gnu_ifunc in section .*" "info sym gnu_ifunc executing"
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set test "info addr gnu_ifunc"
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gdb_test_multiple $test $test {
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-re "Symbol \"gnu_ifunc\" is at (0x\[0-9a-f\]+) in .*$gdb_prompt $" {
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pass $test
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}
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}
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gdb_test "info sym $expect_out(1,string)" "gnu_ifunc in section .*" "info sym <gnu_ifunc-address>"
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# Test statically linked ifunc resolving during inferior start.
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# https://bugzilla.redhat.com/show_bug.cgi?id=624967
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if ![target_info exists gdb_stub] {
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# Compile $staticbinfile separately as it may exit on error (ld/12595).
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if { [gdb_compile ${srcdir}/${subdir}/$libsrc $lib_o object {}] != ""
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|| [gdb_compile "${srcdir}/${subdir}/$srcfile $lib_o" $staticbinfile executable {debug}] != "" } {
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untested "Could not compile static executable $staticbinfile."
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return -1
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}
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clean_restart $staticexecutable
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gdb_breakpoint "gnu_ifunc"
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gdb_breakpoint "main"
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gdb_run_cmd
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gdb_test "" "Breakpoint \[0-9\]*, main .*" "static gnu_ifunc"
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}
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