如何在QEMU监控器中打印SPR_DECR（ppc-softmmu目标）？

Question

我有一个小问题。我在QEMU中使用ppc-softmmu目标，我需要在QEMU Monitor中打印SPR_DECR（在qemu/target-ppc/cpu.h中定义为0x016） 任何人都可以帮忙吗？

谢谢。

Answer 1

在监视器会话，你可以得到完整的寄存器转储：

(qemu) info registers 

在测试虚拟机，这给了我：

(qemu) info registers 
NIP 000000001dbe0bb0 LR 000000001dbe4924 CTR 000000001dbe0bb0 XER 0000000000000000 CPU#0 
MSR 8000000000000000 HID0 0000000000000000 HF 8000000000000000 idx 1 
TB 00000000 1101801658 DECR 3193165638 
GPR00 0000000000000001 000000001e45e6f0 000000001dbffc00 000000001dc43048 
GPR04 0000000000000010 ffffffffffffffe8 000000001e45b008 0000000000000040 
GPR08 0000000000000008 000000001dbfb440 000000001dbe0bb0 0000000000000040 
GPR12 000000001dbe701c 0000000000000000 0000000000000000 0000000000000000 
GPR16 0000000000000000 0000000000000000 0000000000000000 000000001dbe0d54 
GPR20 000000001dbfe070 0000000000000032 000000001dc1b900 000000001dbf9492 
GPR24 0000000000000003 0000000000000006 000000001dbf6800 000000001e45f060 
GPR28 000000001dbf92b0 0000000000000003 000000001dbfb390 000000001e45b010 
CR 40000208 [ G - - - - E - L ]    RES ffffffffffffffff 
FPR00 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
FPR04 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
FPR08 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
FPR12 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
FPR16 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
FPR20 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
FPR24 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
FPR28 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
FPSCR 0000000000000000 
SRR0 000000001dbe0730 SRR1 8000000000000000 PVR 00000000003f0203 VRSAVE 0000000000000000 
SPRG0 0000000000000000 SPRG1 000000000000bf20 SPRG2 0000000000000000 SPRG3 0000000000000000 
SPRG4 0000000000000000 SPRG5 0000000000000000 SPRG6 0000000000000000 SPRG7 0000000000000000 
CFAR 000000001dbe1808 
SDR1 00007f446c800004 DAR 0000000000000000 DSISR 0000000000000000 

- 看到DECR值出现。请注意，该值是十进制，而不是十六进制。

或者，仅打印单缩减器寄存器的值：

(qemu) print $decr 
0xbe53d746