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Debugging: Add kernel debugging support

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Introduce the 'debug-kernel' script to allow developers to
quickly attach a debugger to the QEMU debug remote. The
setting (-s) is already enabled by ./run today when using
QEMU for virtualisation.

If the system is running under QEMU, the debugger
will break in when the script is run. If you add
the -S option to QEMU it will wait for the debugger
to connect before booting the kernel. This allows
you to debug the init/boot process.

Personally I use cgdb instead of gdb, so I opted
to make the debugger used by the script customizable
via an environment variable.

This change also adds -g3 to the kernel build so that
rich debug symbols are available in the kernel binary.
This commit is contained in:
Brian Gianforcaro 2020-01-12 22:50:47 -08:00 • committed by Andreas Kling
parent 10c1f27b7a
commit 46c60fd451
2 changed files with 16 additions and 2 deletions
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4
Kernel/Makefile
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@ -119,11 +119,11 @@ KERNEL = 1
PROGRAM = kernel PROGRAM = kernel
SUBPROJECT_CXXFLAGS += -pie -fPIE -ffreestanding -mno-80387 -mno-mmx -mno-sse -mno-sse2 -fno-asynchronous-unwind-tables SUBPROJECT_CXXFLAGS += -pie -fPIE -ffreestanding -mno-80387 -mno-mmx -mno-sse -mno-sse2 -fno-asynchronous-unwind-tables
SUBPROJECT_CXXFLAGS += -nostdlib -nostdinc -nostdinc++ SUBPROJECT_CXXFLAGS += -nostdlib -nostdinc -nostdinc++ -g3
SUBPROJECT_CXXFLAGS += -I../Toolchain/Local/i686-pc-serenity/include/c++/9.2.0/ SUBPROJECT_CXXFLAGS += -I../Toolchain/Local/i686-pc-serenity/include/c++/9.2.0/
SUBPROJECT_CXXFLAGS += -I../Toolchain/Local/i686-pc-serenity/include/c++/9.2.0/i686-pc-serenity/ SUBPROJECT_CXXFLAGS += -I../Toolchain/Local/i686-pc-serenity/include/c++/9.2.0/i686-pc-serenity/
LDFLAGS += -Ttext 0x100000 -Wl,-T linker.ld -nostdlib -lgcc -lstdc++ LDFLAGS += -Ttext 0x100000 -Wl,-T linker.ld -nostdlib -lgcc -lstdc++ -g3
all: $(PROGRAM) $(MODULE_OBJS) kernel.map all: $(PROGRAM) $(MODULE_OBJS) kernel.map

14
Kernel/debug-kernel Executable file
View file

@ -0,0 +1,14 @@
#!/bin/sh
# Set this environment variable to override the default debugger.
#
[ -z "$SERENITY_KERNEL_DEBUGGER" ] && SERENITY_KERNEL_DEBUGGER="gdb"
# The QEMU -s option (enabled by default in ./run) sets up a debugger
# remote on localhost:1234. So point our debugger there, and inform
# the debugger which binary to load symbols, etc from.
#
$SERENITY_KERNEL_DEBUGGER \
-ex "file $(pwd)/kernel" \
-ex 'set arch i386:intel' \
-ex 'target remote localhost:1234'