Gdbstub support
===========
The Qemu version must be above 9.2 to support two serial ports.
One window:
./tools/configure.sh qemu-armv7a:gdbstub; make -j25
qemu-system-arm -cpu cortex-a7 -nographic -machine virt,virtualization=off,gic-version=2 -net none -kernel ./nuttx -serial mon:stdio -serial pty
char device redirected to /dev/pts/26 (label serial1)
nx_start: Entry
uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
Another window:
gdb-multiarch nuttx -ex "target remot /dev/pts/26"
GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git
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Reading symbols from nuttx...
Remote debugging using /dev/pts/26
gdb_get_registers (state=0x402052f8) at gdbstub/lib_gdbstub.c:1020
1020 reg = state->running_regs;
(gdb) c
Signed-off-by: hujun5 <hujun5@xiaomi.com>
857fdad220