| # Copyright 2008-2024 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 |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # 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 <http://www.gnu.org/licenses/>. |
| |
| # |
| # Test support for stepping over longjmp. |
| # |
| |
| |
| standard_testfile .c |
| |
| if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug nowarnings}] != "" } { |
| untested "failed to compile" |
| return -1 |
| } |
| |
| proc do_test { with_probes } { |
| clean_restart ${::binfile} |
| |
| if { !$with_probes } { |
| gdb_test "maint ignore-probes libc ^longjmp$" |
| } |
| |
| if {![runto_main]} { |
| return 0 |
| } |
| |
| # With a libc with probes, all tests should pass. |
| # |
| # Without probes, we can still set a break on longjmp, but getting the longjmp |
| # target may not work, in the following cases: |
| # - gdbarch_get_longjmp_target_p (gdbarch) == 0: not implemented. |
| # - gdbarch_get_longjmp_target (gdbarch) == 0: for instance on amd64 if |
| # tdep->jb_pc_offset == -1. |
| # - gdbarch_get_longjmp_target (gdbarch) != 0: if we have a glibc with |
| # pointer mangling ( https://sourceware.org/glibc/wiki/PointerEncryption ) |
| # then we retrieve a mangled longjmp target that needs to be demangled. |
| # For instance on amd64 with target board unix/-m32. |
| # |
| # Pointer demangling is currently not implemented for any target. |
| # For the amd64 case, this would require copying for instance this: |
| # 48 c1 ca 11 ror $0x11,%rdx |
| # 64 48 33 14 25 30 00 xor %fs:0x30,%rdx |
| # into a scratch space, save the register set, set %rdx to the mangled |
| # longjmp target, displaced-step through the two insn and read the |
| # demangled longjmp target from %rdx, and restore the register set. |
| # |
| # The failure mode in the first two cases is that the next degrades into a |
| # continue. The failure mode in the latter case is a failure to set a |
| # breakpoint (matched by re_cannot_insert_bp) and a stop in longjmp. |
| # |
| # We detect the different failure modes and kfail these. |
| |
| set have_longjmp_probe [have_longjmp_probe] |
| |
| if { $with_probes } { |
| if { !$have_longjmp_probe } { |
| unsupported "longjmp probe required" |
| return |
| } |
| } else { |
| gdb_assert { !$have_longjmp_probe } |
| } |
| |
| # When using these line numbers in break linespecs, prefix each of these |
| # with "$subdir/$srcfile:" to avoid referring to a glibc file when stopped |
| # in __libc_siglongjmp or similar. |
| set bp_miss_step_1 [gdb_get_line_number "miss_step_1"] |
| set bp_miss_step_2 [gdb_get_line_number "miss_step_2"] |
| |
| set bp_start_test_1 [gdb_get_line_number "patt1"] |
| set bp_start_test_2 [gdb_get_line_number "patt2"] |
| set bp_start_test_3 [gdb_get_line_number "patt3"] |
| |
| set re_cannot_insert_bp \ |
| [multi_line \ |
| "Warning:" \ |
| "Cannot insert breakpoint $::decimal\\." \ |
| "Cannot access memory at address $::hex"] |
| |
| # |
| # Pattern 1 - simple longjmp. |
| # |
| |
| with_test_prefix "pattern 1" { |
| |
| with_test_prefix setup { |
| delete_breakpoints |
| |
| gdb_test "break $::subdir/$::srcfile:$bp_start_test_1" \ |
| "Breakpoint.*at.* file .*$::srcfile, line.*$bp_start_test_1.*" \ |
| "breakpoint at pattern start" |
| gdb_test "continue" "patt1.*" "continue to breakpoint at pattern start" |
| |
| # set safe-net break |
| gdb_test "break $::subdir/$::srcfile:$bp_miss_step_1" \ |
| "Breakpoint.*at.* file .*$::srcfile, line.*$bp_miss_step_1.*" \ |
| "breakpoint at safety net" |
| } |
| |
| gdb_test "next" "longjmps\\+\\+;.*" "next over setjmp" |
| gdb_test "next" "longjmp \\(env, 1\\);.*" "next to longjmp" |
| |
| set msg "next over longjmp" |
| gdb_test_multiple "next" $msg { |
| -re ".*patt1.*$::gdb_prompt $" { |
| pass $msg |
| gdb_test "next" "resumes\\+\\+.*" "next into else block" |
| gdb_test "next" "miss_step_1.*" "next into safety net" |
| } |
| -re "miss_step_1.*$::gdb_prompt $" { |
| if { $have_longjmp_probe } { |
| fail $gdb_test_name |
| } else { |
| kfail $gdb_test_name "gdb/26967" |
| } |
| } |
| -re -wrap "\r\n$re_cannot_insert_bp\r\n.*" { |
| if { $have_longjmp_probe } { |
| fail $gdb_test_name |
| } else { |
| kfail $gdb_test_name "gdb/26967" |
| } |
| } |
| } |
| } |
| |
| # |
| # Pattern 2 - longjmp from an inner function. |
| # |
| |
| with_test_prefix "pattern 2" { |
| |
| with_test_prefix setup { |
| delete_breakpoints |
| |
| gdb_test "break $::subdir/$::srcfile:$bp_start_test_2" \ |
| "Breakpoint.*at.* file .*$::srcfile, line.*$bp_start_test_2.*" \ |
| "breakpoint at pattern start" |
| gdb_test "continue" "patt2.*" "continue to breakpoint at pattern start" |
| |
| # set safe-net break |
| gdb_test "break $::subdir/$::srcfile:$bp_miss_step_2" \ |
| "Breakpoint.*at.* file .*$::srcfile, line.*$bp_miss_step_2.*" \ |
| "breakpoint at safety net" |
| } |
| |
| gdb_test "next" "call_longjmp.*" "next over setjmp" |
| |
| set msg "next over call_longjmp" |
| gdb_test_multiple "next" $msg { |
| -re ".*patt2.*$::gdb_prompt $" { |
| pass $msg |
| |
| gdb_test "next" "resumes\\+\\+.*" "next into else block" |
| gdb_test "next" "miss_step_2.*" "next into safety net" |
| } |
| -re "miss_step_2.*$::gdb_prompt $" { |
| if { $have_longjmp_probe } { |
| fail $gdb_test_name |
| } else { |
| kfail $gdb_test_name "gdb/26967" |
| } |
| } |
| -re -wrap "\r\n$re_cannot_insert_bp\r\n.*" { |
| if { $have_longjmp_probe } { |
| fail $gdb_test_name |
| } else { |
| kfail $gdb_test_name "gdb/26967" |
| } |
| } |
| } |
| } |
| |
| # |
| # Pattern 3 - setjmp/longjmp inside stepped-over function. |
| # |
| |
| with_test_prefix "pattern 3" { |
| |
| with_test_prefix setup { |
| delete_breakpoints |
| |
| gdb_test "break $::subdir/$::srcfile:$bp_start_test_3" \ |
| "Breakpoint.*at.* file .*$::srcfile, line.*$bp_start_test_3.*" \ |
| "breakpoint at pattern start" |
| gdb_test "continue" "patt3.*" "continue to breakpoint at pattern start" |
| } |
| |
| gdb_test_multiple "next" "next over pattern" { |
| -re -wrap "longjmp caught.*" { |
| pass $gdb_test_name |
| } |
| -re -wrap "\r\n$re_cannot_insert_bp\r\n.*" { |
| if { $have_longjmp_probe } { |
| fail $gdb_test_name |
| } else { |
| kfail $gdb_test_name "gdb/26967" |
| } |
| } |
| } |
| } |
| } |
| |
| foreach_with_prefix with_probes { 0 1 } { |
| do_test $with_probes |
| } |