1# Copyright (C) 2009-2014 Free Software Foundation, Inc. 2 3# This program is free software; you can redistribute it and/or modify 4# it under the terms of the GNU General Public License as published by 5# the Free Software Foundation; either version 3 of the License, or 6# (at your option) any later version. 7# 8# This program is distributed in the hope that it will be useful, 9# but WITHOUT ANY WARRANTY; without even the implied warranty of 10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11# GNU General Public License for more details. 12# 13# You should have received a copy of the GNU General Public License 14# along with this program. If not, see <http://www.gnu.org/licenses/>. 15 16if {[skip_shlib_tests]} { 17 return 0 18} 19 20standard_testfile .c 21set executable ${testfile} 22set staticexecutable ${executable}-static 23set staticbinfile [standard_output_file ${staticexecutable}] 24 25set libfile "${testfile}-lib" 26set libsrc ${libfile}.c 27set lib_so [standard_output_file ${libfile}.so] 28# $lib_o must not have {debug}, it would override the STT_GNU_IFUNC ELF markers. 29set lib_o [standard_output_file ${libfile}.o] 30 31# We need DWARF for the "final" function as we "step" into the function and GDB 32# would step-over the "final" function if there would be no line number debug 33# information (DWARF) available. 34# 35# We must not have DWARF for the "gnu_ifunc" function as DWARF has no way to 36# express the STT_GNU_IFUNC type and it would be considered as a regular 37# function due to DWARF by GDB. In ELF gnu-ifunc is expressed by the 38# STT_GNU_IFUNC type. 39# 40# Both functions need to be in the same shared library file but 41# gdb_compile_shlib has no way to specify source-specific compilation options. 42# 43# Therefore $libfile contains only the STT_GNU_IFUNC function with no DWARF 44# referencing all the other parts from the main executable with DWARF. 45 46set lib_opts {} 47set exec_opts [list debug shlib=$lib_so] 48 49if [get_compiler_info] { 50 return -1 51} 52 53if { [gdb_compile_shlib ${srcdir}/${subdir}/$libsrc $lib_so $lib_opts] != "" 54 || [gdb_compile ${srcdir}/${subdir}/$srcfile $binfile executable $exec_opts] != ""} { 55 untested "Could not compile dynamic executable $binfile." 56 return -1 57} 58 59# Start with a fresh gdb. 60 61clean_restart $executable 62gdb_load_shlibs ${lib_so} 63 64if ![runto_main] then { 65 fail "Can't run to main" 66 return 1 67} 68 69# The "if" condition is artifical to test regression of a former patch. 70gdb_breakpoint "[gdb_get_line_number "break-at-nextcall"] if i && gnu_ifunc (i) != 42" 71 72gdb_breakpoint [gdb_get_line_number "break-at-call"] 73gdb_continue_to_breakpoint "break-at-call" ".*break-at-call.*" 74 75# Test GDB will automatically indirect the call. 76 77gdb_test "p gnu_ifunc (3)" " = 4" 78 79# Test GDB will skip the gnu_ifunc resolver on first call. 80 81gdb_test "step" "\r\nfinal .*" 82 83# Test GDB will not break before the final chosen implementation. 84 85# Also test a former patch regression: 86# Continuing. 87# Error in testing breakpoint condition: 88# Attempt to take address of value not located in memory. 89# 90# Breakpoint 2, main () at ./gdb.base/gnu-ifunc.c:33 91 92gdb_test "continue" "Continuing.\r\n\r\nBreakpoint .* (at|in) .*break-at-nextcall.*" \ 93 "continue to break-at-nextcall" 94 95gdb_breakpoint "gnu_ifunc" 96 97gdb_continue_to_breakpoint "nextcall gnu_ifunc" 98 99gdb_test "frame" "#0 +(0x\[0-9a-f\]+ in +)?final \\(.*" "nextcall gnu_ifunc skipped" 100 101 102# Check any commands not doing an inferior call access the address of the 103# STT_GNU_IFUNC resolver, not the target function. 104 105if {[istarget powerpc64-*] && [is_lp64_target]} { 106 # With only minimal symbols GDB provides the function descriptors. With 107 # full debug info the function code would be displayed. 108 set func_prefix {\.} 109} else { 110 set func_prefix {} 111} 112 113gdb_test "p gnu_ifunc" " = {<text gnu-indirect-function variable, no debug info>} 0x\[0-9a-f\]+ <${func_prefix}gnu_ifunc>" "p gnu_ifunc executing" 114gdb_test "info sym gnu_ifunc" "gnu_ifunc in section .*" "info sym gnu_ifunc executing" 115 116set test "info addr gnu_ifunc" 117gdb_test_multiple $test $test { 118 -re "Symbol \"gnu_ifunc\" is at (0x\[0-9a-f\]+) in .*$gdb_prompt $" { 119 pass $test 120 } 121} 122gdb_test "info sym $expect_out(1,string)" "gnu_ifunc in section .*" "info sym <gnu_ifunc-address>" 123 124 125# Test statically linked ifunc resolving during inferior start. 126# https://bugzilla.redhat.com/show_bug.cgi?id=624967 127 128# Compile $staticbinfile separately as it may exit on error (ld/12595). 129 130if { [gdb_compile ${srcdir}/${subdir}/$libsrc $lib_o object {}] != "" 131 || [gdb_compile "${srcdir}/${subdir}/$srcfile $lib_o" $staticbinfile executable {debug}] != "" } { 132 untested "Could not compile static executable $staticbinfile." 133 return -1 134} 135 136clean_restart $staticexecutable 137 138gdb_breakpoint "gnu_ifunc" 139gdb_breakpoint "main" 140gdb_run_cmd 141gdb_test "" "Breakpoint \[0-9\]*, main .*" "static gnu_ifunc" 142