forked from Imagelibrary/binutils-gdb
d51a931152
On aarch64-linux (debian 12), when running test-case
gdb.base/longjmp-until-in-main.exp, I run into:
...
(gdb) until 33^M
warning: Breakpoint address adjusted from 0x70f727c678928489 to 0xfff727c678928489.^M
Warning:^M
Cannot insert breakpoint 0.^M
Cannot access memory at address 0xfff727c678928489^M
^M
0x0000fffff7e3a580 in siglongjmp () from /lib/aarch64-linux-gnu/libc.so.6^M
(gdb) FAIL: gdb.base/longjmp-until-in-main.exp: until $line, in main
...
This is PR gdb/26967: no longjmp probe is available:
...
(gdb) info probes stap libc ^longjmp$^M
No probes matched.^M
...
and glibc applies pointer mangling which makes it fairly difficult for gdb to
get the longjmp target.
There's a KFAIL for this in test-case gdb.base/longjmp.exp, added in commit
b5e7cd5cd3 ("[gdb/testsuite] Add KFAILs in gdb.base/longjmp.exp").
Factor out new proc have_longjmp_probe, and use it to add similar KFAIL in
this and one more test-case.
Tested on aarch64-linux.
Approved-By: Tom Tromey <tom@tromey.com>
219 lines
6.5 KiB
Plaintext
219 lines
6.5 KiB
Plaintext
# Copyright 2008-2024 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Test support for stepping over longjmp.
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#
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standard_testfile .c
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if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug nowarnings}] != "" } {
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untested "failed to compile"
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return -1
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}
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proc do_test { with_probes } {
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clean_restart ${::binfile}
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if { !$with_probes } {
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gdb_test "maint ignore-probes libc ^longjmp$"
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}
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if {![runto_main]} {
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return 0
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}
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# With a libc with probes, all tests should pass.
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#
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# Without probes, we can still set a break on longjmp, but getting the longjmp
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# target may not work, in the following cases:
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# - gdbarch_get_longjmp_target_p (gdbarch) == 0: not implemented.
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# - gdbarch_get_longjmp_target (gdbarch) == 0: for instance on amd64 if
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# tdep->jb_pc_offset == -1.
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# - gdbarch_get_longjmp_target (gdbarch) != 0: if we have a glibc with
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# pointer mangling ( https://sourceware.org/glibc/wiki/PointerEncryption )
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# then we retrieve a mangled longjmp target that needs to be demangled.
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# For instance on amd64 with target board unix/-m32.
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#
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# Pointer demangling is currently not implemented for any target.
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# For the amd64 case, this would require copying for instance this:
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# 48 c1 ca 11 ror $0x11,%rdx
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# 64 48 33 14 25 30 00 xor %fs:0x30,%rdx
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# into a scratch space, save the register set, set %rdx to the mangled
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# longjmp target, displaced-step through the two insn and read the
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# demangled longjmp target from %rdx, and restore the register set.
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#
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# The failure mode in the first two cases is that the next degrades into a
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# continue. The failure mode in the latter case is a failure to set a
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# breakpoint (matched by re_cannot_insert_bp) and a stop in longjmp.
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#
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# We detect the different failure modes and kfail these.
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set have_longjmp_probe [have_longjmp_probe]
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if { $with_probes } {
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if { !$have_longjmp_probe } {
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unsupported "longjmp probe required"
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return
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}
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} else {
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gdb_assert { !$have_longjmp_probe }
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}
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# When using these line numbers in break linespecs, prefix each of these
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# with "$subdir/$srcfile:" to avoid referring to a glibc file when stopped
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# in __libc_siglongjmp or similar.
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set bp_miss_step_1 [gdb_get_line_number "miss_step_1"]
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set bp_miss_step_2 [gdb_get_line_number "miss_step_2"]
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set bp_start_test_1 [gdb_get_line_number "patt1"]
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set bp_start_test_2 [gdb_get_line_number "patt2"]
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set bp_start_test_3 [gdb_get_line_number "patt3"]
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set re_cannot_insert_bp \
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[multi_line \
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"Warning:" \
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"Cannot insert breakpoint $::decimal\\." \
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"Cannot access memory at address $::hex"]
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#
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# Pattern 1 - simple longjmp.
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#
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with_test_prefix "pattern 1" {
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with_test_prefix setup {
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delete_breakpoints
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gdb_test "break $::subdir/$::srcfile:$bp_start_test_1" \
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"Breakpoint.*at.* file .*$::srcfile, line.*$bp_start_test_1.*" \
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"breakpoint at pattern start"
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gdb_test "continue" "patt1.*" "continue to breakpoint at pattern start"
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# set safe-net break
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gdb_test "break $::subdir/$::srcfile:$bp_miss_step_1" \
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"Breakpoint.*at.* file .*$::srcfile, line.*$bp_miss_step_1.*" \
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"breakpoint at safety net"
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}
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gdb_test "next" "longjmps\\+\\+;.*" "next over setjmp"
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gdb_test "next" "longjmp \\(env, 1\\);.*" "next to longjmp"
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set msg "next over longjmp"
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gdb_test_multiple "next" $msg {
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-re ".*patt1.*$::gdb_prompt $" {
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pass $msg
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gdb_test "next" "resumes\\+\\+.*" "next into else block"
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gdb_test "next" "miss_step_1.*" "next into safety net"
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}
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-re "miss_step_1.*$::gdb_prompt $" {
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if { $have_longjmp_probe } {
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fail $gdb_test_name
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} else {
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kfail $gdb_test_name "gdb/26967"
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}
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}
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-re -wrap "\r\n$re_cannot_insert_bp\r\n.*" {
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if { $have_longjmp_probe } {
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fail $gdb_test_name
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} else {
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kfail $gdb_test_name "gdb/26967"
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}
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}
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}
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}
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#
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# Pattern 2 - longjmp from an inner function.
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#
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with_test_prefix "pattern 2" {
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with_test_prefix setup {
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delete_breakpoints
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gdb_test "break $::subdir/$::srcfile:$bp_start_test_2" \
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"Breakpoint.*at.* file .*$::srcfile, line.*$bp_start_test_2.*" \
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"breakpoint at pattern start"
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gdb_test "continue" "patt2.*" "continue to breakpoint at pattern start"
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# set safe-net break
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gdb_test "break $::subdir/$::srcfile:$bp_miss_step_2" \
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"Breakpoint.*at.* file .*$::srcfile, line.*$bp_miss_step_2.*" \
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"breakpoint at safety net"
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}
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gdb_test "next" "call_longjmp.*" "next over setjmp"
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set msg "next over call_longjmp"
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gdb_test_multiple "next" $msg {
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-re ".*patt2.*$::gdb_prompt $" {
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pass $msg
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gdb_test "next" "resumes\\+\\+.*" "next into else block"
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gdb_test "next" "miss_step_2.*" "next into safety net"
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}
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-re "miss_step_2.*$::gdb_prompt $" {
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if { $have_longjmp_probe } {
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fail $gdb_test_name
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} else {
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kfail $gdb_test_name "gdb/26967"
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}
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}
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-re -wrap "\r\n$re_cannot_insert_bp\r\n.*" {
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if { $have_longjmp_probe } {
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fail $gdb_test_name
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} else {
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kfail $gdb_test_name "gdb/26967"
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}
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}
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}
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}
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#
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# Pattern 3 - setjmp/longjmp inside stepped-over function.
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#
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with_test_prefix "pattern 3" {
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with_test_prefix setup {
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delete_breakpoints
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gdb_test "break $::subdir/$::srcfile:$bp_start_test_3" \
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"Breakpoint.*at.* file .*$::srcfile, line.*$bp_start_test_3.*" \
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"breakpoint at pattern start"
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gdb_test "continue" "patt3.*" "continue to breakpoint at pattern start"
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}
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gdb_test_multiple "next" "next over pattern" {
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-re -wrap "longjmp caught.*" {
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pass $gdb_test_name
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}
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-re -wrap "\r\n$re_cannot_insert_bp\r\n.*" {
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if { $have_longjmp_probe } {
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fail $gdb_test_name
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} else {
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kfail $gdb_test_name "gdb/26967"
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}
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}
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}
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}
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}
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foreach_with_prefix with_probes { 0 1 } {
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do_test $with_probes
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}
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