gdb/testsuite/gdb.arch/ppc64-break-on-_exit.exp

   1 # Copyright 2021-2024 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 # Set a breakpoint on a local copy of glibc's _exit, and verify that it
  17 # triggers.  The function does a syscall immediately after the prologue, and
  18 # if the breakpoint is set past the syscall due to faulty prologue skipping,
  19 # the breakpoint will not trigger.
  20 #
  21 # In particular, we're trying to exercise the instruction analysis
  22 # functionality of prologue skipping.  If non-minimal symbols are
  23 # read, then that functionality might not be used because f.i.
  24 # line-info is used instead.  So, we use nodebug.
  25
  26 require {istarget "powerpc*"} is_lp64_target
  27
  28 set flags { nodebug }
  29 if [info exists COMPILE] {
  30     standard_testfile .c -main.c
  31     lappend flags optimize=-O2
  32     lappend flags additional_flags=-fno-stack-protector
  33     lappend flags additional_flags=-mlong-double-128
  34     lappend flags additional_flags=-fpic
  35     lappend flags additional_flags=-ftls-model=initial-exec
  36 } else {
  37     standard_testfile .s -main.c
  38 }
  39
  40 if { [prepare_for_testing "failed to prepare" ${testfile} \
  41           [list $srcfile $srcfile2] $flags] } {
  42     return -1
  43 }
  44
  45 if {![runto_main]} {
  46     return 0
  47 }
  48
  49 gdb_breakpoint "_exit"
  50
  51 # If the skip_prologue analysis of _exit is too eager, we may not hit the
  52 # breakpoint.
  53 gdb_continue_to_breakpoint "_exit" "_exit \\(\\).*"