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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_riscv/host_missing/accel_TCG/1060.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 1060
-title = "RISC-V: mtval/stval is not correctly set to the instruction itself on illegal instructions"
-state = "closed"
-created_at = "2022-06-03T19:27:05.176Z"
-closed_at = "2022-07-03T04:38:37.975Z"
-labels = ["Closed::Fixed", "accel: TCG", "target: riscv"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/1060"
-host-os = "NixOS unstable, git commit 692517bf851f2d8d999f0ad50f53fa1d2dd5c8f9"
-host-arch = "x86-64"
-qemu-version = "7.0.0"
-guest-os = "n/a"
-guest-arch = "n/a"
-description = """QEMU 7.0 claims to support `stval`/`mtval` for illegal instructions, but `mtval`/`stval` is actually set to `0`"""
-reproduce = """1. Assemble and link `mtval-illegal.elf`. The code simply sets up a trap handler and generates an illegal instruction exception
-
-2. Start QEMU with:
-
-  ```
-  qemu-system-riscv64 -cpu rv64,h=off -bios mtval-illegal.elf -nographic -icount shift=0 -s -S
-  ```
-
-3. Attach with GDB:
-
-  ```
-  gdb mtval-illegal.elf
-
-  # Within GDB
-  target extended-remote :1234
-  break trap
-  disp $mtval
-
-  # Keep single stepping until breakpoint
-  stepi
-  ```
-
-4. When control flow reaches `trap`, `mtval` is written with `0` instead of the encoding of `csrw time, x0` (`0xc0101073`)"""
-additional = """Writing `0` to `mtval` on a illegal instruction trap is allowed by the specs, but since the [changelog of QEMU 7.0][changelog] says it should be supported, I would consider it a bug.
-
-[changelog]: https://wiki.qemu.org/ChangeLog/7.0#RISC-V
-
-I encountered this when trying to figure out why my program worked with QEMU 6 but breaks with QEMU 7. It's more complicated, but in that case I managed to get `mtval` written with neither `0` nor the actual illegal instruction, but a different illegal instruction. I will try gathering up all the dependencies and write down the steps to reproduce if needed and if I find the time."""