This starts gdb with `file` being the `hello` (elf) binary, and runs the `openocd.gdb` script, which loads (flashes) the binary to the target (our devkit). The script connects to the `openocd` server, enables `semihosting` and `ITM` tracing, sets `breakpoint`s at `main` (as well as some exception handlers, more on those later), finally it flashes the binary and runs the first instruction (`stepi`). (You can change the startup behavior in the `openocd.gdb` scritp, e.g., to `continue` instead of `stepi`.)
This starts gdb with `file` being the `hello` (elf) binary, and runs the `openocd.gdb` script, which loads (flashes) the binary to the target (our devkit). The script connects to the `openocd` server, enables `semihosting` and `ITM` tracing, sets `breakpoint`s at `main` (as well as some exception handlers, more on those later), finally it flashes the binary and runs the first instruction (`stepi`). (You can change the startup behavior in the `openocd.gdb` script, e.g., to `continue` instead of `stepi`.)
4. You can now continue debugging of the program:
``` console
...
Note: automatically using hardware breakpoints for read-only addresses.
halted: PC: 0x08000a72
DefaultPreInit ()
at /home/pln/.cargo/registry/src/github.com-1ecc6299db9ec823/cortex-m-rt-0.6.12/src/lib.rs:571
571 pub unsafe extern "C" fn DefaultPreInit() {}
(gdb) c
Continuing.
...
...
@@ -96,13 +103,20 @@ The `cortex-m-rt` run-time initializes the system and your global variables (in
``` console
(gdb) c
Continuing.
halted: PC: 0x08000608
halted: PC: 0x0800043a
^C
Program received signal SIGINT, Interrupt.
hello::__cortex_m_rt_main () at examples/hello.rs:15
15 loop {
```
At this point, the `openocd` terminal should read:
At this point, the `openocd` terminal should read something like:
@@ -117,7 +131,7 @@ Program received signal SIGINT, Interrupt.
(gdb)
```
You have now compiled and debugged a minimal Rust `hello` example. `gdb` is a very useful tool so lookup some tutorials/docs (e.g., https://sourceware.org/gdb/onlinedocs/gdb/), a Cheat Sheet can be found at https://darkdust.net/files/GDB%20Cheat%20Sheet.pdf.
You have now compiled and debugged a minimal Rust `hello` example. `gdb` is a very useful tool so lookup some tutorials/docs (e.g., [gdb-doc](https://sourceware.org/gdb/onlinedocs/gdb/), and the [GDB Cheat Sheet](https://darkdust.net/files/GDB%20Cheat%20Sheet.pdf).
