1# Copyright (C) 2009, 2010, 2011 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 20set testfile "gnu-ifunc" 21set executable ${testfile} 22set srcfile ${testfile}.c 23set binfile ${objdir}/${subdir}/${executable} 24set staticexecutable ${executable}-static 25set staticbinfile ${objdir}/${subdir}/${staticexecutable} 26 27set libfile "${testfile}-lib" 28set libsrc ${libfile}.c 29set lib_so ${objdir}/${subdir}/${libfile}.so 30# $lib_o must not have {debug}, it would override the STT_GNU_IFUNC ELF markers. 31set lib_o ${objdir}/${subdir}/${libfile}.o 32 33# We need DWARF for the "final" function as we "step" into the function and GDB 34# would step-over the "final" function if there would be no line number debug 35# information (DWARF) available. 36# 37# We must not have DWARF for the "gnu_ifunc" function as DWARF has no way to 38# express the STT_GNU_IFUNC type and it would be considered as a regular 39# function due to DWARF by GDB. In ELF gnu-ifunc is expressed by the 40# STT_GNU_IFUNC type. 41# 42# Both functions need to be in the same shared library file but 43# gdb_compile_shlib has no way to specify source-specific compilation options. 44# 45# Therefore $libfile contains only the STT_GNU_IFUNC function with no DWARF 46# referencing all the other parts from the main executable with DWARF. 47 48set lib_opts {} 49set exec_opts [list debug shlib=$lib_so] 50 51if [get_compiler_info ${binfile}] { 52 return -1 53} 54 55if { [gdb_compile_shlib ${srcdir}/${subdir}/$libsrc $lib_so $lib_opts] != "" 56 || [gdb_compile ${srcdir}/${subdir}/$srcfile $binfile executable $exec_opts] != ""} { 57 untested "Could not compile dynamic executable $binfile." 58 return -1 59} 60 61# Start with a fresh gdb. 62 63clean_restart $executable 64gdb_load_shlibs ${lib_so} 65 66if ![runto_main] then { 67 fail "Can't run to main" 68 return 1; 69} 70 71# The "if" condition is artifical to test regression of a former patch. 72gdb_breakpoint "[gdb_get_line_number "break-at-nextcall"] if i && gnu_ifunc (i) != 42" 73 74gdb_breakpoint [gdb_get_line_number "break-at-call"] 75gdb_continue_to_breakpoint "break-at-call" ".*break-at-call.*" 76 77# Test GDB will automatically indirect the call. 78 79gdb_test "p gnu_ifunc (3)" " = 4" 80 81# Test GDB will skip the gnu_ifunc resolver on first call. 82 83gdb_test "step" "\r\nfinal .*" 84 85# Test GDB will not break before the final chosen implementation. 86 87# Also test a former patch regression: 88# Continuing. 89# Error in testing breakpoint condition: 90# Attempt to take address of value not located in memory. 91# 92# Breakpoint 2, main () at ./gdb.base/gnu-ifunc.c:33 93 94gdb_test "continue" "Continuing.\r\n\r\nBreakpoint .* (at|in) .*break-at-nextcall.*" \ 95 "continue to break-at-nextcall" 96 97gdb_breakpoint "gnu_ifunc" 98 99gdb_continue_to_breakpoint "nextcall gnu_ifunc" 100 101gdb_test "frame" "#0 +(0x\[0-9a-f\]+ in +)?final \\(.*" "nextcall gnu_ifunc skipped" 102 103 104# Check any commands not doing an inferior call access the address of the 105# STT_GNU_IFUNC resolver, not the target function. 106 107if {[istarget powerpc64-*] && [is_lp64_target]} { 108 # With only minimal symbols GDB provides the function descriptors. With 109 # full debug info the function code would be displayed. 110 set func_prefix {\.} 111} else { 112 set func_prefix {} 113} 114 115gdb_test "p gnu_ifunc" " = {<text gnu-indirect-function variable, no debug info>} 0x\[0-9a-f\]+ <${func_prefix}gnu_ifunc>" "p gnu_ifunc executing" 116gdb_test "info sym gnu_ifunc" "gnu_ifunc in section .*" "info sym gnu_ifunc executing" 117 118set test "info addr gnu_ifunc" 119gdb_test_multiple $test $test { 120 -re "Symbol \"gnu_ifunc\" is at (0x\[0-9a-f\]+) in .*$gdb_prompt $" { 121 pass $test 122 } 123} 124gdb_test "info sym $expect_out(1,string)" "gnu_ifunc in section .*" "info sym <gnu_ifunc-address>" 125 126 127# Test statically linked ifunc resolving during inferior start. 128# https://bugzilla.redhat.com/show_bug.cgi?id=624967 129 130if ![target_info exists gdb_stub] { 131 132 # Compile $staticbinfile separately as it may exit on error (ld/12595). 133 134 if { [gdb_compile ${srcdir}/${subdir}/$libsrc $lib_o object {}] != "" 135 || [gdb_compile "${srcdir}/${subdir}/$srcfile $lib_o" $staticbinfile executable {debug}] != "" } { 136 untested "Could not compile static executable $staticbinfile." 137 return -1 138 } 139 140 clean_restart $staticexecutable 141 142 gdb_breakpoint "gnu_ifunc" 143 gdb_breakpoint "main" 144 gdb_run_cmd 145 gdb_test "" "Breakpoint \[0-9\]*, main .*" "static gnu_ifunc" 146} 147