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      1 # Copyright 2018-2024 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 require supports_reverse
     17 
     18 require {istarget "x86*"}
     19 
     20 standard_testfile
     21 
     22 set cflags {}
     23 lappend cflags debug
     24 lappend cflags additional_flags=-mindirect-branch=thunk
     25 lappend cflags additional_flags=-mfunction-return=thunk
     26 
     27 set fcf_protection_none additional_flags=-fcf-protection=none
     28 if { [gdb_can_simple_compile fcf-protection-none {int main () { return 0; }} \
     29 	  executable $fcf_protection_none] } {
     30     lappend cflags $fcf_protection_none
     31 }
     32 
     33 if { [prepare_for_testing "failed to prepare" $testfile $srcfile $cflags] } {
     34     return -1
     35 }
     36 
     37 if { ![runto_main] } {
     38     return -1
     39 }
     40 
     41 gdb_test_no_output "record"
     42 gdb_test "next" ".*" "record trace"
     43 
     44 # Normal stepping steps through all thunks.
     45 gdb_test "reverse-step" "apply\.3.*" "reverse-step into apply"
     46 gdb_test "reverse-step" "inc\.3.*" "reverse-step into inc"
     47 gdb_test "reverse-step" "inc\.2.*" "reverse-step inside inc"
     48 gdb_test "reverse-step" "apply\.2.*" \
     49     "reverse-step through call thunk into apply, first time"
     50 gdb_test "reverse-step" "main\.2.*" "reverse-step into main"
     51 gdb_test "step" "apply\.2.*" "step into apply"
     52 gdb_test "step" "inc\.2.*" "step through call thunk into inc"
     53 gdb_test "reverse-step" "apply\.2.*" \
     54     "reverse-step through call thunk into apply, second time"
     55 gdb_test "next" "apply\.3.*" "step through thunks and over inc"
     56 gdb_test "reverse-next" "apply\.2.*" \
     57     "reverse-step through thunks and over inc"
     58 
     59 # We can use instruction stepping to step into thunks.
     60 repeat_cmd_until "stepi" "apply\.2" "indirect_thunk" "stepi into call thunk"
     61 repeat_cmd_until "stepi" "indirect_thunk" "inc" \
     62     "stepi out of call thunk into inc"
     63 set alphanum_re "\[a-zA-Z0-9\]"
     64 set pic_thunk_re  "__$alphanum_re*\\.get_pc_thunk\\.$alphanum_re* \\(\\)"
     65 repeat_cmd_until "stepi" "(inc|$pic_thunk_re)" "return_thunk" "stepi into return thunk"
     66 repeat_cmd_until "stepi" "return_thunk" "apply" \
     67     "stepi out of return thunk back into apply"
     68 
     69 repeat_cmd_until "reverse-stepi" "apply" "return_thunk" \
     70     "reverse-stepi into return thunk"
     71 repeat_cmd_until "reverse-stepi" "return_thunk" "inc" \
     72     "reverse-stepi out of return thunk into inc"
     73 repeat_cmd_until "reverse-stepi" "(inc|$pic_thunk_re)" "indirect_thunk" \
     74     "reverse-stepi into call thunk"
     75 repeat_cmd_until "reverse-stepi" "indirect_thunk" "apply" \
     76     "reverse-stepi out of call thunk into apply"
     77