仿真平台内核初版 -tlib库 包含<sparc arm riscv powerPC>

scripts/complex/reverse_execution/README.md

@@ -0,0 +1,72 @@
+# 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.
+
+```bash
+renode scripts/complex/reverse_execution/gdb_reverse_execution.resc
+```
+
+2. Use `script.gdb` GDB script to easily connect to Renode with preset breakpoints.
+
+```bash
+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!
+
+---
+
+For more information visit [Renode documentation](https://renode.readthedocs.io/en/latest/debugging/gdb.html#reverse-execution)

scripts/complex/reverse_execution/gdb_reverse_execution.resc

@@ -0,0 +1,59 @@
+mach create
+machine LoadPlatformDescription @platforms/cpus/sifive-fe310.repl
+
+cpu AssembleBlock 0x80000000 """
+.equ UART0_BASE, 0x10013000
+.equ UART_TXDATA, 0x00
+.equ UART_TXCTRL, 0x08
+
+li sp, 0x80004000
+// UART Setup
+li t0, UART0_BASE
+li t1, 1
+sw t1, UART_TXCTRL(t0)
+
+// Our test
+li t3, 0x1337
+beq t3, t4, ok
+
+wrong:
+la a0, wrong_str
+call uart_puts
+j hang
+
+ok:
+la a0, ok_str
+call uart_puts
+
+hang:
+j hang
+
+uart_putc:
+li t2, UART0_BASE
+sw a0, UART_TXDATA(t2)
+ret
+
+uart_puts:
+addi sp, sp, -16
+sw ra, 12(sp)
+mv t0, a0
+1:  lbu a0, 0(t0)
+beqz a0, 2f
+addi t0, t0, 1
+call uart_putc
+j 1b
+2:  lw ra, 12(sp)
+addi sp, sp, 16
+ret
+
+wrong_str:
+.string ":("
+ok_str:
+.string "OK"
+"""
+
+cpu PC 0x80000000
+
+showAnalyzer uart0
+machine StartGdbServer 3333
+reverseExecMode true

scripts/complex/reverse_execution/script.gdb

@@ -0,0 +1,11 @@
+layout asm
+target remote :3333
+
+# Break on the beginning of the program
+break *0x80000000
+
+# Break on the `beq t3, t4, ok` test
+break *0x80000014
+
+# Break on infinite loop
+break *0x8000003a