blob: 6ce7c83f9f8ad97244c7cc98763c1c4bd65db56d (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
Single-step exceptions incorrectly routed to EL1 when ELD is EL2 (TDE = 1) (qemu version 3.1)
Hi,
I've been encountering issues with QEMU 3.1 when trying to single-step EL1 code, with ELD = EL2 (MDCR_EL2.TDE = 1). I could test with latest commit in a few hours, if you want.
EL1 is Aarch64.
These happen as soon as MDSCR_EL1.SS is set to 1 and ERET is executed:
1) Single-step exceptions are generated even if they should not be (SPSR_EL2.SS = 0)
2) Single-step exceptions are routed to EL1
Exception return from AArch64 EL2 to AArch64 EL1 PC 0x4000005c
Taking exception 1 [Undefined Instruction]
...from EL1 to EL1
...with ESR 0x32/0xca000022
...with ELR 0x4000005c
...to EL1 PC 0x200 PSTATE 0x3c5
EC 0x32 (0b110010) is Exception_SoftwareStepLowerEl.
You can find enclosed minimal code (and resulting .elf) for reproduction.
qemu-system-aarch64 -nographic -machine virt,virtualization=on -d unimp,int -cpu cortex-a57 -kernel test_hyp.elf
|