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Debugging: Add kernel debugging support
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.
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2 changed files with 16 additions and 2 deletions
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@ -119,11 +119,11 @@ KERNEL = 1
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PROGRAM = kernel
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SUBPROJECT_CXXFLAGS += -pie -fPIE -ffreestanding -mno-80387 -mno-mmx -mno-sse -mno-sse2 -fno-asynchronous-unwind-tables
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SUBPROJECT_CXXFLAGS += -nostdlib -nostdinc -nostdinc++
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SUBPROJECT_CXXFLAGS += -nostdlib -nostdinc -nostdinc++ -g3
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SUBPROJECT_CXXFLAGS += -I../Toolchain/Local/i686-pc-serenity/include/c++/9.2.0/
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SUBPROJECT_CXXFLAGS += -I../Toolchain/Local/i686-pc-serenity/include/c++/9.2.0/i686-pc-serenity/
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LDFLAGS += -Ttext 0x100000 -Wl,-T linker.ld -nostdlib -lgcc -lstdc++
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LDFLAGS += -Ttext 0x100000 -Wl,-T linker.ld -nostdlib -lgcc -lstdc++ -g3
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all: $(PROGRAM) $(MODULE_OBJS) kernel.map
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14
Kernel/debug-kernel
Executable file
14
Kernel/debug-kernel
Executable file
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@ -0,0 +1,14 @@
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#!/bin/sh
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# Set this environment variable to override the default debugger.
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#
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[ -z "$SERENITY_KERNEL_DEBUGGER" ] && SERENITY_KERNEL_DEBUGGER="gdb"
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# The QEMU -s option (enabled by default in ./run) sets up a debugger
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# remote on localhost:1234. So point our debugger there, and inform
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# the debugger which binary to load symbols, etc from.
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#
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$SERENITY_KERNEL_DEBUGGER \
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-ex "file $(pwd)/kernel" \
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-ex 'set arch i386:intel' \
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-ex 'target remote localhost:1234'
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