simulation_core/scripts/complex/reverse_execution/README.md

Reverse Execution Demo

This is a demo showcasing Renode's support for GDB reverse execution.

Running the demo

1. gdb_reverse_execution.resc Renode script creates a RISC-V machine with small assembly printing to UART.

renode scripts/complex/reverse_execution/gdb_reverse_execution.resc

2. Use script.gdb GDB script to easily connect to Renode with preset breakpoints.

gdb -x script.gdb

3. Follow the flow of the demonstration

Breakpoint 1, 0x80000000 in ?? ()
(gdb) continue
Continuing.

Breakpoint 2, 0x80000014 in ?? ()
(gdb) continue
Continuing.

Breakpoint 3, 0x8000003a in ?? ()

Now you can see :( printed on UART.

4. Execute reverse-* commands in GDB:

(gdb) reverse-continue
Continuing.

Breakpoint 2, 0x80000014 in ?? ()
(gdb) reverse-stepi
0x80000010 in ?? ()
(gdb) rsi
0x8000000e in ?? ()
(gdb) rc
Continuing.

Breakpoint 1, 0x80000000 in ?? ()
(gdb)

5. Set t4 register to 0x1337 to branch in beq t3, t4, ok test.

(gdb) set $t4=0x1337
(gdb) continue
Continuing.

Breakpoint 2, 0x80000014 in ?? ()
(gdb) continue
Continuing.

Breakpoint 3, 0x8000003a in ?? ()
(gdb)

Spot OK on UART console!

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For more information visit Renode documentation