mirror of
https://sourceware.org/git/binutils-gdb.git
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252 lines
7.4 KiB
Plaintext
252 lines
7.4 KiB
Plaintext
# Copyright 2012-2018 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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standard_testfile jithost.c
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if { (![istarget x86_64-*-*] && ![istarget i?86-*-*]) || ![is_lp64_target] } {
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return -1;
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}
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if {[skip_shlib_tests]} {
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return -1
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}
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if { ![isnative] } {
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return -1
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}
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if {[get_compiler_info]} {
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untested "could not get compiler info"
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return 1
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}
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set jit_host_src $srcfile
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set jit_host_bin $binfile
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# We inject the complete path to jit-reader.h into the source file
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# lest we end up (incorrectly) building against a system-installed
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# version.
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set jit_reader_header [standard_output_file "../../../../../gdb/jit-reader.h"]
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set jit_reader_flag "-DJIT_READER_H=\"$jit_reader_header\""
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if { [gdb_compile "${srcdir}/${subdir}/${jit_host_src}" "${jit_host_bin}" \
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executable [list debug additional_flags=$jit_reader_flag]] != "" } {
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untested "failed to compile"
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return -1
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}
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set jit_reader jitreader
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set jit_reader_src ${jit_reader}.c
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set jit_reader_bin [standard_output_file ${jit_reader}.so]
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if { [gdb_compile_shlib "${srcdir}/${subdir}/${jit_reader_src}" "${jit_reader_bin}" \
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[list debug additional_flags=$jit_reader_flag]] != "" } {
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untested "failed to compile"
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return -1
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}
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# Test "info registers" in the current frame, expecting RSP's value to
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# be SP.
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proc info_registers_current_frame {sp} {
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global hex decimal
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set any "\[^\r\n\]*"
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gdb_test "info registers" \
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[multi_line \
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"rax $hex $decimal" \
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"rbx $hex $decimal" \
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"rcx $hex $decimal" \
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"rdx $hex $decimal" \
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"rsi $hex $decimal" \
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"rdi $hex $decimal" \
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"rbp $hex $hex" \
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"rsp $sp $sp" \
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"r8 $hex $decimal" \
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"r9 $hex $decimal" \
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"r10 $hex $decimal" \
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"r11 $hex $decimal" \
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"r12 $hex $decimal" \
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"r13 $hex $decimal" \
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"r14 $hex $decimal" \
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"r15 $hex $decimal" \
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"rip $hex $hex$any" \
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"eflags $hex \\\[$any\\\]" \
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"cs $hex $decimal" \
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"ss $hex $decimal" \
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"ds $hex $decimal" \
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"es $hex $decimal" \
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"fs $hex $decimal" \
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"gs $hex $decimal" \
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]
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}
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proc jit_reader_test {} {
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global jit_host_bin
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global jit_reader_bin
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global verbose
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global hex decimal
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set any "\[^\r\n\]*"
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clean_restart $jit_host_bin
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gdb_load_shlib $jit_reader_bin
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if {$verbose > 0} {
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gdb_test_no_output "set debug jit 1"
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}
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gdb_test_no_output "jit-reader-load ${jit_reader_bin}" "jit-reader-load"
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gdb_run_cmd
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gdb_test "" "Program received signal SIGTRAP, .*" "expect SIGTRAP"
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# Test the JIT reader unwinder.
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with_test_prefix "with jit-reader" {
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with_test_prefix "before mangling" {
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gdb_test "bt" \
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[multi_line \
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"#0 ${any} in jit_function_00 ${any}" \
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"#1 ${any} in main ${any}" \
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] \
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"bt works"
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set sp_before_mangling \
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[get_hexadecimal_valueof "\$sp" 0 "get sp"]
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gdb_test "up" "#1 $any in main $any\r\n$any function $any" \
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"move up to caller"
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set caller_sp \
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[get_hexadecimal_valueof "\$sp" 0 "get caller sp"]
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}
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# Step over the instruction that mangles the stack pointer.
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# While that confuses GDB's built-in unwinder, the JIT
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# reader's unwinder understands the mangling and should thus
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# be able to unwind at that location.
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with_test_prefix "after mangling" {
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gdb_test "si" "in jit_function_00 .*" "step over stack mangling"
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set sp_after_mangling \
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[get_hexadecimal_valueof "\$sp" 0 "get sp"]
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gdb_assert {$sp_before_mangling != $sp_after_mangling} \
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"sp is mangled"
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# Check that the jit unwinder manages to backtrace through
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# the mangled stack pointer.
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gdb_test "bt" \
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[multi_line \
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"#0 ${any} in jit_function_00 ${any}" \
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"#1 ${any} in main ${any}" \
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] \
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"bt works"
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with_test_prefix "current frame" {
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info_registers_current_frame $sp_after_mangling
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gdb_test "info frame" \
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"Stack level 0, frame at $sp_before_mangling.*in jit_function_00.*"
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}
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with_test_prefix "caller frame" {
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gdb_test "up" "#1 $any in main $any\r\n$any function $any" \
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"up to caller"
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# Since the JIT unwinder only provides RIP/RSP/RBP,
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# all other registers should show as "<not saved>".
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gdb_test "info registers" \
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[multi_line \
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"rax <not saved>" \
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"rbx <not saved>" \
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"rcx <not saved>" \
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"rdx <not saved>" \
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"rsi <not saved>" \
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"rdi <not saved>" \
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"rbp $hex $hex" \
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"rsp $caller_sp $caller_sp" \
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"r8 <not saved>" \
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"r9 <not saved>" \
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"r10 <not saved>" \
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"r11 <not saved>" \
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"r12 <not saved>" \
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"r13 <not saved>" \
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"r14 <not saved>" \
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"r15 <not saved>" \
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"rip $hex $hex $any" \
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"eflags <not saved>" \
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"cs <not saved>" \
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"ss <not saved>" \
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"ds <not saved>" \
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"es <not saved>" \
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"fs <not saved>" \
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"gs <not saved>" \
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]
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# Make sure that "info frame" doesn't crash.
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gdb_test "info frame" "Stack level 1, .*in main.*"
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# ... and that neither does printing a pseudo
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# register.
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gdb_test "print /x \$ebp" " = $hex" "print pseudo register"
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# There's no way for the JIT reader API to support
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# modifyiable values.
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gdb_test "print \$rbp = -1" \
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"Attempt to assign to an unmodifiable value\." \
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"cannot assign to register"
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}
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}
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}
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# Now unload the jit reader, and ensure that backtracing really
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# doesn't work without it.
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with_test_prefix "without jit-reader" {
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gdb_test_no_output "jit-reader-unload ${jit_reader_bin}" \
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"jit-reader-unload"
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# Check that we're no longer using the JIT unwinder, and that
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# the built-in unwinder cannot backtrace through the mangled
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# stack pointer.
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gdb_test "bt" \
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[multi_line \
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"Backtrace stopped: Cannot access memory at address $sp_after_mangling" \
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] \
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"bt shows error"
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gdb_test "info frame" "Cannot access memory at address.*" \
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"info frame shows error"
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info_registers_current_frame $sp_after_mangling
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gdb_test "up" "Initial frame selected; you cannot go up\\." \
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"cannot go up"
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}
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with_test_prefix "with jit-reader again" {
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gdb_test_no_output "jit-reader-load ${jit_reader_bin}" "jit-reader-load"
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# Check that the jit unwinder manages to backtrace through
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# the mangled stack pointer.
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gdb_test "bt" \
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[multi_line \
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"#0 ${any} in jit_function_00 ${any}" \
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"#1 ${any} in main ${any}" \
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]
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}
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}
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jit_reader_test
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