IAN@DESKTOP-9AEMEPL MINGW64 ~/Desktop/mini-riscv-os/07-ExterInterrupt (feat/getchar)
$ make
riscv64-unknown-elf-gcc -nostdlib -fno-builtin -mcmodel=medany -march=rv32ima -mabi=ilp32 -g -Wall -T os.ld -o os.elf start.s sys.s lib.c timer.c task.c os.c user.c trap.c lock.c plic.c
IAN@DESKTOP-9AEMEPL MINGW64 ~/Desktop/mini-riscv-os/07-ExterInterrupt (feat/getchar)
$ make qemu
Press Ctrl-A and then X to exit QEMU
qemu-system-riscv32 -nographic -smp 4 -machine virt -bios none -kernel os.elf
OS start
OS: Activate next task
Task0: Created!
Task0: Running...
Task0: Running...
Task0: Running...
Task0: Running...
Task0: Running...
external interruption!
j
Task0: Running...
Task0: Running...
external interruption!
k
Task0: Running...
Task0: Running...
Task0: Running...
external interruption!
j
Task0: Running...
external interruption!
k
external interruption!
j
Task0: Running...
timer interruption!
timer_handler: 1
OS: Back to OS
QEMU: Terminatedmake debug
riscv64-unknown-elf-gcc -nostdlib -fno-builtin -mcmodel=medany -march=rv32ima -mabi=ilp32 -g -Wall -T os.ld -o os.elf start.s sys.s lib.c timer.c task.c os.c user.c trap.c lock.c
Press Ctrl-C and then input 'quit' to exit GDB and QEMU
-------------------------------------------------------
Reading symbols from os.elf...
Breakpoint 1 at 0x80000000: file start.s, line 7.
0x00001000 in ?? ()
=> 0x00001000: 97 02 00 00 auipc t0,0x0
Thread 1 hit Breakpoint 1, _start () at start.s:7
7 csrr t0, mhartid # read current hart id
=> 0x80000000 <_start+0>: f3 22 40 f1 csrr t0,mhartid
(gdb)You can set the breakpoint in any c file:
(gdb) b trap.c:27
Breakpoint 2 at 0x80008f78: file trap.c, line 27.
(gdb)As the example above, when process running on trap.c, line 27 (Timer Interrupt).
The process will be suspended automatically until you press the key c (continue) or s (step).