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# Copyright 2012-2021 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/>.
standard_testfile jit-reader-host.c
if { (![istarget x86_64-*-*] && ![istarget i?86-*-*]) || ![is_lp64_target] } {
return -1;
}
if {[skip_shlib_tests]} {
return -1
}
if { ![isnative] } {
return -1
}
if {[get_compiler_info]} {
untested "could not get compiler info"
return 1
}
# Increase this to see more detail.
set test_verbose 0
set jit_host_src $srcfile
set jit_host_bin $binfile
# We inject the complete path to jit-reader.h into the source file
# lest we end up (incorrectly) building against a system-installed
# version.
set jit_reader_header [standard_output_file "../../../../../gdb/jit-reader.h"]
set jit_reader_flag "-DJIT_READER_H=\"$jit_reader_header\""
if { [gdb_compile "${srcdir}/${subdir}/${jit_host_src}" "${jit_host_bin}" \
executable [list debug additional_flags=$jit_reader_flag]] != "" } {
untested "failed to compile"
return -1
}
set jit_reader jit-reader
set jit_reader_src ${jit_reader}.c
set jit_reader_bin [standard_output_file ${jit_reader}.so]
if { [gdb_compile_shlib "${srcdir}/${subdir}/${jit_reader_src}" "${jit_reader_bin}" \
[list debug additional_flags=$jit_reader_flag]] != "" } {
untested "failed to compile"
return -1
}
# Test "info registers" in the current frame, expecting RSP's value to
# be SP.
proc info_registers_current_frame {sp} {
global hex decimal
set any "\[^\r\n\]*"
set neg_decimal "-?$decimal"
set expected \
[multi_line \
"rax $hex +$neg_decimal" \
"rbx $hex +$neg_decimal" \
"rcx $hex +$neg_decimal" \
"rdx $hex +$neg_decimal" \
"rsi $hex +$neg_decimal" \
"rdi $hex +$neg_decimal" \
"rbp $hex +$hex" \
"rsp $sp +$sp" \
"r8 $hex +$neg_decimal" \
"r9 $hex +$neg_decimal" \
"r10 $hex +$neg_decimal" \
"r11 $hex +$neg_decimal" \
"r12 $hex +$neg_decimal" \
"r13 $hex +$neg_decimal" \
"r14 $hex +$neg_decimal" \
"r15 $hex +$neg_decimal" \
"rip $hex +$hex$any" \
"eflags $hex +\\\[$any\\\]" \
"cs $hex +$neg_decimal" \
"ss $hex +$neg_decimal" \
"ds $hex +$neg_decimal" \
"es $hex +$neg_decimal" \
"fs $hex +$neg_decimal" \
"gs $hex +$neg_decimal" \
]
# There may be more registers.
append expected ".*"
gdb_test "info registers" $expected
}
proc jit_reader_test {} {
global jit_host_bin
global jit_reader_bin
global test_verbose
global hex decimal
set any "\[^\r\n\]*"
clean_restart $jit_host_bin
gdb_load_shlib $jit_reader_bin
if {$test_verbose > 0} {
gdb_test_no_output "set debug jit 1"
}
gdb_test_no_output "jit-reader-load ${jit_reader_bin}" "jit-reader-load"
gdb_run_cmd
gdb_test "" "Program received signal SIGTRAP, .*" "expect SIGTRAP"
# Test the JIT reader unwinder.
with_test_prefix "with jit-reader" {
with_test_prefix "before mangling" {
gdb_test "bt" \
[multi_line \
"#0 ${any} in jit_function_stack_mangle ${any}" \
"#1 ${any} in main ${any}" \
] \
"bt works"
set sp_before_mangling \
[get_hexadecimal_valueof "\$sp" 0 "get sp"]
gdb_test "up" "#1 $any in main $any\r\n$any function_stack_mangle $any" \
"move up to caller"
set caller_sp \
[get_hexadecimal_valueof "\$sp" 0 "get caller sp"]
}
# Step over the instruction that mangles the stack pointer.
# While that confuses GDB's built-in unwinder, the JIT
# reader's unwinder understands the mangling and should thus
# be able to unwind at that location.
with_test_prefix "after mangling" {
gdb_test "si" "in jit_function_stack_mangle .*" "step over stack mangling"
set sp_after_mangling \
[get_hexadecimal_valueof "\$sp" 0 "get sp"]
gdb_assert {$sp_before_mangling != $sp_after_mangling} \
"sp is mangled"
# Check that the jit unwinder manages to backtrace through
# the mangled stack pointer.
gdb_test "bt" \
[multi_line \
"#0 ${any} in jit_function_stack_mangle ${any}" \
"#1 ${any} in main ${any}" \
] \
"bt works"
with_test_prefix "current frame" {
info_registers_current_frame $sp_after_mangling
gdb_test "info frame" \
"Stack level 0, frame at $sp_before_mangling.*in jit_function_stack_mangle.*"
}
with_test_prefix "caller frame" {
gdb_test "up" "#1 $any in main $any\r\n$any function_stack_mangle $any" \
"up to caller"
# Since the JIT unwinder only provides RIP/RSP/RBP,
# all other registers should show as "<not saved>".
set expected \
[multi_line \
"rax <not saved>" \
"rbx <not saved>" \
"rcx <not saved>" \
"rdx <not saved>" \
"rsi <not saved>" \
"rdi <not saved>" \
"rbp $hex +$hex" \
"rsp $caller_sp +$caller_sp" \
"r8 <not saved>" \
"r9 <not saved>" \
"r10 <not saved>" \
"r11 <not saved>" \
"r12 <not saved>" \
"r13 <not saved>" \
"r14 <not saved>" \
"r15 <not saved>" \
"rip $hex +$hex $any" \
"eflags <not saved>" \
"cs <not saved>" \
"ss <not saved>" \
"ds <not saved>" \
"es <not saved>" \
"fs <not saved>" \
"gs <not saved>" \
]
# There may be more registers.
append expected ".*"
gdb_test "info registers" $expected
# Make sure that "info frame" doesn't crash.
gdb_test "info frame" "Stack level 1, .*in main.*"
# ... and that neither does printing a pseudo
# register.
gdb_test "print /x \$ebp" " = $hex" "print pseudo register"
# There's no way for the JIT reader API to support
# modifyiable values.
gdb_test "print \$rbp = -1" \
"Attempt to assign to an unmodifiable value\." \
"cannot assign to register"
}
}
}
# Now unload the jit reader, and ensure that backtracing really
# doesn't work without it.
with_test_prefix "without jit-reader" {
gdb_test_no_output "jit-reader-unload ${jit_reader_bin}" \
"jit-reader-unload"
# Check that we're no longer using the JIT unwinder, and that
# the built-in unwinder cannot backtrace through the mangled
# stack pointer.
gdb_test "bt" \
"Backtrace stopped: Cannot access memory at address $sp_after_mangling" \
"bt shows error"
gdb_test "info frame" "Cannot access memory at address.*" \
"info frame shows error"
info_registers_current_frame $sp_after_mangling
gdb_test "up" "Initial frame selected; you cannot go up\\." \
"cannot go up"
}
with_test_prefix "with jit-reader again" {
gdb_test_no_output "jit-reader-load ${jit_reader_bin}" "jit-reader-load"
# Check that the jit unwinder manages to backtrace through
# the mangled stack pointer.
gdb_test "bt" \
[multi_line \
"#0 ${any} in jit_function_stack_mangle ${any}" \
"#1 ${any} in main ${any}" \
]
}
}
jit_reader_test
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