forked from Imagelibrary/binutils-gdb
4a620b7e30
This commit includes the JIT object's symfile address in the names of objfiles created by JIT reader API (e.g., << JIT compiled code at 0x7ffd8a0c77a0 >>). This allows one to at least differentiate one from another. The address is the one that the debugged program has put in jit_code_entry::symfile_addr, and that the JIT reader's read function receives. As we can see in gdb.base/jit-reader-host.c and gdb.base/jit-reader.c, that may not be the actual value of where the JIT-ed code is. But it is a value chosen by the author of the JIT engine and the JIT reader, so including this value in the objfile name may help them correlate the JIT objfiles created by with their logs / data structures. To access this field, we need to pass down a reference to the jit_code_entry. So make jit_dbg_reader_data a structure (instead of an alias for a CORE_ADDR) that includes the address of the code entry in the inferior's address space (the previous meaning of jit_dbg_reader_data) plus a reference to the jit_code_entry as read into GDB's address space. And while at it, pass down the gdbarch, so that we don't have to call target_gdbarch. Co-Authored-By: Jan Vrany <jan.vrany@labware.com> Change-Id: Ib26c4d1bd8de503d651aff89ad2e500cb312afa5
277 lines
8.2 KiB
Plaintext
277 lines
8.2 KiB
Plaintext
# Copyright 2012-2022 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 jit-reader-host.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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# Increase this to see more detail.
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set test_verbose 0
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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 jit-reader
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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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set neg_decimal "-?$decimal"
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set expected \
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[multi_line \
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"rax $hex +$neg_decimal" \
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"rbx $hex +$neg_decimal" \
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"rcx $hex +$neg_decimal" \
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"rdx $hex +$neg_decimal" \
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"rsi $hex +$neg_decimal" \
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"rdi $hex +$neg_decimal" \
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"rbp $hex +$hex" \
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"rsp $sp +$sp" \
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"r8 $hex +$neg_decimal" \
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"r9 $hex +$neg_decimal" \
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"r10 $hex +$neg_decimal" \
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"r11 $hex +$neg_decimal" \
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"r12 $hex +$neg_decimal" \
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"r13 $hex +$neg_decimal" \
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"r14 $hex +$neg_decimal" \
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"r15 $hex +$neg_decimal" \
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"rip $hex +$hex$any" \
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"eflags $hex +\\\[$any\\\]" \
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"cs $hex +$neg_decimal" \
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"ss $hex +$neg_decimal" \
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"ds $hex +$neg_decimal" \
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"es $hex +$neg_decimal" \
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"fs $hex +$neg_decimal" \
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"gs $hex +$neg_decimal" \
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]
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# There may be more registers.
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append expected ".*"
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gdb_test "info registers" $expected
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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 test_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 $jit_reader_bin
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if {$test_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_stack_mangle ${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_stack_mangle $any" \
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"move up to caller"
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set caller_sp \
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[get_hexadecimal_valueof "\$sp" 0 "get caller sp"]
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}
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# Step over the instruction that mangles the stack pointer.
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# While that confuses GDB's built-in unwinder, the JIT
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# reader's unwinder understands the mangling and should thus
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# be able to unwind at that location.
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with_test_prefix "after mangling" {
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gdb_test "si" "in jit_function_stack_mangle .*" "step over stack mangling"
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set sp_after_mangling \
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[get_hexadecimal_valueof "\$sp" 0 "get sp"]
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gdb_assert {$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_stack_mangle ${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_stack_mangle.*"
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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_stack_mangle $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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set expected \
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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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# There may be more registers.
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append expected ".*"
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gdb_test "info registers" $expected
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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" " = $hex" "print pseudo register"
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# There's no way for the JIT reader API to support
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# modifyiable values.
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gdb_test "print \$rbp = -1" \
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"Attempt to assign to an unmodifiable value\." \
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"cannot assign to register"
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}
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if { ![skip_python_tests] } {
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gdb_test "python print(gdb.objfiles())" \
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"$any<gdb.Objfile filename=<< JIT compiled code at $hex >>>$any" \
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"python gdb.Objfile.__repr__ ()"
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gdb_test "python print(list(map(lambda objf : objf.filename, gdb.objfiles())))" \
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"$any'<< JIT compiled code at $hex >>'$any" \
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"python gdb.Objfile.filename"
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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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"Backtrace stopped: Cannot access memory at address $sp_after_mangling" \
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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_stack_mangle ${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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