1# Copyright 2004-2020 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 16# This test is to check that a frame's "info frame", especially the 17# saved registers list, doesn't change while that frame isn't current. 18 19# It uses the program savedregs.c to construct a somewhat warped 20# backtrace (contains both signal and dummy frames) and then, at each 21# step checks that non-inner frames have consistent "info frame" 22# output. Note that a frame's "info frame" can only be captured after 23# it is non-current (made a call, interrupted, ...), this is because 24# instructions executed to perform the call may affect "info frame" 25# output. 26 27if [target_info exists gdb,nosignals] { 28 verbose "Skipping savedregs.exp because of nosignals." 29 continue 30} 31 32 33standard_testfile .c 34 35if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } { 36 untested "failed to compile" 37 return -1 38} 39 40# get things started 41clean_restart ${binfile} 42 43# Advance to main 44if ![runto_main] then { 45 fail "can't run to main" 46 return 0 47} 48 49proc process_saved_regs { current inner outer } { 50 global gdb_prompt 51 global expect_out 52 global saved_regs 53 54 # Skip the CURRENT frame. 55 56 set level 1 57 58 # Run over the list of INNER frames capturing the "info frame" 59 # output for each. Both dummy and sigtramp frames need to be 60 # handled specially: they do not yet have correct function names; 61 # and for dummy frames won't have saved registers. If there's a 62 # problem, fail but capture the output anyway, hopefully later 63 # "info frame" requests for that same frame will at least fail in 64 # a consistent manner (stops propogated fails). 65 66 foreach func $inner { 67 set saved_regs($func) "error" 68 set test "get $func info frame" 69 # Both dummy and sigtramp frames have problems. 70 switch $func { 71 dummy { 72 # Dummy frame's do not have saved registers, and do 73 # not print <dummy>. 74 set pat "Stack frame at .*" 75 } 76 sigtramp { 77 # Sigtramp frames don't yet print <signal trampoline>. 78 set pat "Stack frame at .* Saved registers:.*" 79 } 80 default { 81 set pat "Stack frame at .* in $func .*( Saved registers:.*)?" 82 } 83 } 84 # If the "info frame" barf, capture the output anyway so that 85 # it does not cascade further failures. 86 gdb_test_multiple "info frame $level" "$test" { 87 -re "($pat)$gdb_prompt " { 88 set saved_regs($func) "$expect_out(1,string)" 89 pass "$test" 90 } 91 -re "(Stack frame at .*)$gdb_prompt " { 92 set saved_regs($func) "$expect_out(1,string)" 93 fail "$test" 94 } 95 -re "(Cannot access .*)$gdb_prompt " { 96 set saved_regs($func) "$expect_out(1,string)" 97 fail "$test" 98 } 99 } 100 incr level 101 } 102 103 # Now iterate through the list of OUTER frames checking that the 104 # "info frame" output from each still matches what was captured 105 # during an early query. To avoid cascading failures, checking is 106 # abandoned after the first failure. The assumption is that, 107 # since frames outer to the botched frame rely on the botched 108 # frame's info, those more outer frames are also botched. Besides 109 # we've got the failure we're after. 110 111 set ok 1 112 foreach func $outer { 113 set test [concat "Check $func info frame; stack contains" \ 114 $current $inner $outer] 115 if $ok { 116 set ok 0 117 set pat [string_to_regexp "$saved_regs($func)"] 118 gdb_test_multiple "info frame $level" "$test" { 119 -re "$pat$gdb_prompt " { 120 pass "$test" 121 set ok 1 122 } 123 } 124 } { 125 pass "$test (skipped)" 126 } 127 incr level 128 } 129} 130 131 132# Continue to the signal thrower, capture main's saved-reg info. 133gdb_test "advance thrower" "thrower .* at .*" 134process_saved_regs thrower { main } { } 135 136# Continue to the signal catcher, check main's saved-reg info, capture 137# catcher's saved-reg info. 138gdb_test "handle SIGSEGV pass print nostop" 139gdb_test "handle SIGILL pass print nostop" 140gdb_test "advance catcher" "catcher .* at .*" 141process_saved_regs catcher { sigtramp thrower } { main } 142 143# Breakpoint at and call the caller function, saved-regs of main and 144# catcher, capture caller's registers. 145gdb_test "break caller" 146gdb_test "call caller (1,2,3,4,5,6,7,8)" 147process_saved_regs caller { dummy catcher } { sigtramp thrower main } 148 149# Run to callee, again check everything. 150gdb_test "advance callee" "callee .* at .*" 151process_saved_regs callee { caller } { dummy catcher sigtramp thrower main } 152