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-kernel: 0.902
-debug: 0.848
-graphic: 0.839
-device: 0.680
-performance: 0.679
-boot: 0.672
-architecture: 0.650
-risc-v: 0.549
-semantic: 0.448
-x86: 0.416
-peripherals: 0.375
-user-level: 0.371
-permissions: 0.314
-PID: 0.280
-ppc: 0.246
-mistranslation: 0.233
-register: 0.228
-i386: 0.213
-virtual: 0.210
-vnc: 0.171
-socket: 0.147
-network: 0.129
-hypervisor: 0.118
-TCG: 0.113
-VMM: 0.102
-assembly: 0.101
-KVM: 0.093
-arm: 0.072
-files: 0.063
-
-riscv64  cannot use the mret instruction to jump to the address corresponding to s mode
-Description of problem:
-I use coreboot to boot my linux kernel.The kernel is copied at 0x82200000,I set reg mepc 0x82200000,and set reg mstatus a00000800.
-and I use "mret" instruction so that qemu can jump to 0x82200000 and enter S mode.But some errors happened.
-It shows:
-[DEBUG]  Exception:          Instruction access fault
-[DEBUG]  Hart ID:            0
-[DEBUG]  Previous mode:      machine
-[DEBUG]  Bad instruction pc: 0x8103f7c0
-[DEBUG]  Bad address:        0x00000000
-[DEBUG]  Stored ra:          0x8103f7b8
-[DEBUG]  Stored sp:          0x82032f08
-Bad instruction pc: 0x8103f7c0 in my elf file instruction is "mret".
-So I can not jump to my kernel's load address.
-I think when I use -bios option,my qemu should in M mode.How could I can jump to my mepc address?
-Steps to reproduce:
-1.download qemu
-2.download coreboot
-Additional information:
-When I enter qemu with -bios option,I find that the reg mstatus is 0xa0000000.