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$ riscv32-elf-gdb ./bin/blink.elf 
Reading symbols from ./bin/blink.elf...
(gdb) target extended-remote /dev/ttyACM0
Remote debugging using /dev/ttyACM0
0x0000019e in busywait (x=x@entry=300000) at blink.cpp:8
8          for (volatile int i = 0; i < x; i++) {
(gdb) p x
$1 = 300000
(gdb) info frame
Stack level 0, frame at 0x200007f0:
 pc = 0xd28 in busywait (blink.cpp:8); saved pc = 0xdb4
 called by frame at 0x200007fc
 source language c++.
 Arglist at 0x200007f0, args: x=x@entry=300000
 Locals at 0x200007f0, Previous frame's sp is 0x200007f0
(gdb) bt
#0  0x00000d28 in busywait (x=x@entry=300000) at blink.cpp:8
#1  0x00000db4 in main () at blink.cpp:35

(gdb) break 8
Breakpoint 1 at 0xd24: file blink.cpp, line 8.
Note: automatically using hardware breakpoints for read-only addresses.
(gdb) continue 
Continuing.

Breakpoint 1, busywait (x=32800, x@entry=300000) at blink.cpp:8
8          for (volatile int i = 0; i < x; i++) {
(gdb) info registers
ra             0xda4    0xda4 <main()+108>
sp             0x200007f0       0x200007f0
gp             0x20000800       0x20000800
tp             0x804e06a4       0x804e06a4
t0             0x1a0    416
t1             0x40014281       1073824385
t2             0x5b763111       1534472465
fp             0x0      0x0 <InterruptVectorDefault>
s1             0x40011000       1073811456
a0             0x8020   32800
a1             0x4002200c       1073881100
a2             0x8000d40        134221120
a3             0x50000  327680
a4             0x10040  65600
a5             0x90000  589824
pc             0xd2e    0xd2e <busywait(int)+12>

$CC -g -O0 -ffunction-sections -static-libgcc -lgcc -march=rv32ec_zicsr -mabi=ilp32e -I/usr/include/newlib -nostdlib -I. -Wall -c ch32v003fun.c -o obj/ch32v003fun.o

gdb-multiarch -x gdbinit -ex 'load' -ex 'detach' -ex 'quit' bin/blink.elf

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Reading symbols from bin/blink.elf...
0x000001e4 in busywait (x=600000) at blink.cpp:4
4	   for (volatile int i = 0; i < x; i++) {
(gdb) break 10
Breakpoint 1 at 0x212: file blink.cpp, line 10.
Note: automatically using hardware breakpoints for read-only addresses.
(gdb) break 11
Breakpoint 2 at 0x214: file blink.cpp, line 13.
(gdb) c
Continuing.

Program received signal SIGTRAP, Trace/breakpoint trap.
0x000001e4 in busywait (x=<error reading variable: Cannot access memory at address 0xfffffff4>) at blink.cpp:4
4	   for (volatile int i = 0; i < x; i++) {
(gdb)