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-id = 2074
-title = "riscv64  cannot use the mret instruction to jump to the address corresponding to s mode"
-state = "closed"
-created_at = "2024-01-05T08:17:33.034Z"
-closed_at = "2024-01-18T06:49:14.552Z"
-labels = ["target: riscv"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2074"
-host-os = "Linux"
-host-arch = "x86"
-qemu-version = "QEMU emulator version 8.1.90"
-guest-os = "coreboot/bios"
-guest-arch = "riscv"
-description = """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?"""
-reproduce = """1.download qemu
-2.download coreboot"""
-additional = """When I enter qemu with -bios option,I find that the reg mstatus is 0xa0000000."""