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# Copyright 2004-2021 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
# 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 <>.
# This test is to check that a frame's "info frame", especially the
# saved registers list, doesn't change while that frame isn't current.
# It uses the program savedregs.c to construct a somewhat warped
# backtrace (contains both signal and dummy frames) and then, at each
# step checks that non-inner frames have consistent "info frame"
# output. Note that a frame's "info frame" can only be captured after
# it is non-current (made a call, interrupted, ...), this is because
# instructions executed to perform the call may affect "info frame"
# output.
if [target_info exists gdb,nosignals] {
verbose "Skipping savedregs.exp because of nosignals."
standard_testfile .c
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
untested "failed to compile"
return -1
# get things started
clean_restart ${binfile}
# Advance to main
if ![runto_main] then {
return 0
proc process_saved_regs { current inner outer } {
global gdb_prompt
global expect_out
global saved_regs
# Skip the CURRENT frame.
set level 1
# Run over the list of INNER frames capturing the "info frame"
# output for each. Both dummy and sigtramp frames need to be
# handled specially: they do not yet have correct function names;
# and for dummy frames won't have saved registers. If there's a
# problem, fail but capture the output anyway, hopefully later
# "info frame" requests for that same frame will at least fail in
# a consistent manner (stops propogated fails).
foreach func $inner {
set saved_regs($func) "error"
set test "get $func info frame"
# Both dummy and sigtramp frames have problems.
switch $func {
dummy {
# Dummy frame's do not have saved registers, and do
# not print <dummy>.
set pat "Stack frame at .*"
sigtramp {
# Sigtramp frames don't yet print <signal trampoline>.
set pat "Stack frame at .* Saved registers:.*"
default {
set pat "Stack frame at .* in $func .*( Saved registers:.*)?"
# If the "info frame" barf, capture the output anyway so that
# it does not cascade further failures.
gdb_test_multiple "info frame $level" "$test" {
-re "($pat)$gdb_prompt " {
set saved_regs($func) "$expect_out(1,string)"
pass "$test"
-re "(Stack frame at .*)$gdb_prompt " {
set saved_regs($func) "$expect_out(1,string)"
fail "$test"
-re "(Cannot access .*)$gdb_prompt " {
set saved_regs($func) "$expect_out(1,string)"
fail "$test"
incr level
# Now iterate through the list of OUTER frames checking that the
# "info frame" output from each still matches what was captured
# during an early query. To avoid cascading failures, checking is
# abandoned after the first failure. The assumption is that,
# since frames outer to the botched frame rely on the botched
# frame's info, those more outer frames are also botched. Besides
# we've got the failure we're after.
set ok 1
foreach func $outer {
set test [concat "Check $func info frame; stack contains" \
$current $inner $outer]
if $ok {
set ok 0
set pat [string_to_regexp "$saved_regs($func)"]
gdb_test_multiple "info frame $level" "$test" {
-re "$pat$gdb_prompt " {
pass "$test"
set ok 1
} {
pass "$test (skipped)"
incr level
# Continue to the signal thrower, capture main's saved-reg info.
gdb_test "advance thrower" "thrower .* at .*"
process_saved_regs thrower { main } { }
# Continue to the signal catcher, check main's saved-reg info, capture
# catcher's saved-reg info.
gdb_test "handle SIGSEGV pass print nostop"
gdb_test "handle SIGILL pass print nostop"
gdb_test "advance catcher" "catcher .* at .*"
process_saved_regs catcher { sigtramp thrower } { main }
# Breakpoint at and call the caller function, saved-regs of main and
# catcher, capture caller's registers.
gdb_test "break caller"
gdb_test "call caller (1,2,3,4,5,6,7,8)"
process_saved_regs caller { dummy catcher } { sigtramp thrower main }
# Run to callee, again check everything.
gdb_test "advance callee" "callee .* at .*"
process_saved_regs callee { caller } { dummy catcher sigtramp thrower main }