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48 lines
1.3 KiB
Markdown
48 lines
1.3 KiB
Markdown
# GDB Support
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This feature allows remote guest debugging using GDB. Note that this feature is only supported on x86_64/KVM.
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To enable debugging with GDB, build with the `guest_debug` feature enabled:
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```bash
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cargo build --features guest_debug
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```
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To use the `--gdb` option, specify the Unix Domain Socket with `path` that Cloud Hypervisor will use to communicate with the host's GDB:
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```bash
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./cloud-hypervisor \
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--kernel hypervisor-fw \
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--disk path=bionic-server-cloudimg-amd64.raw \
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--cpus boot=1 \
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--memory size=1024M \
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--net "tap=,mac=,ip=,mask=" \
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--console off \
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--serial tty \
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--gdb path=/tmp/ch-gdb-sock
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```
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Cloud Hypervisor will listen for GDB on the host side before starting the guest.
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On the host side, connect to the GDB remote server as follows:
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```bash
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gdb -q
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(gdb) target remote /tmp/ch-gdb-sock
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Remote debugging using /tmp/ch-gdb-sock
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warning: No executable has been specified, and target does not support
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determining executable automatically. Try using the "file" command.
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0x000000000011217e in ?? ()
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```
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You can set up to four hardware breakpoints using the x86 debug register:
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```bash
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(gdb) hb *0x1121b7
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Hardware assisted breakpoint 1 at 0x1121b7
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(gdb) c
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Continuing.
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Breakpoint 1, 0x00000000001121b7 in ?? ()
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(gdb)
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```
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