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