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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/semantic-bugs/semantic/1923197
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloademulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
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@@ -1,149 +0,0 @@
-semantic: 0.907
-mistranslation: 0.879
-other: 0.869
-assembly: 0.855
-instruction: 0.854
-socket: 0.832
-device: 0.813
-graphic: 0.805
-KVM: 0.794
-vnc: 0.737
-boot: 0.724
-network: 0.710
-
-RISC-V priviledged instruction error
-
-Hello when performing an MRET with MPP set to something else than 0b11 in MSTATUS, 'Invalid Instruction' exception will be triggered. The problem appeared in code after version 5.2.0.
-
-<pre>
-  # setup interrupt handling for monitor mode
-  la t0, entry_loop
-  la t1, entry_trap
-  li t2, 0x888
-  li t3, 0x1880 # MPP in MSTATUS selects to which mode to return & MPIE selects if to enable interrupts after MRET
-  csrw mepc, t0
-  csrw mtvec, t1
-  csrs mie, t2
-  csrs mstatus, t3
-
-  # if supervisor mode not supported, then loop forever
-  csrr t0, misa
-  li t1, 0x40000
-  and t2, t1, t0
-  beqz t2, 1f
-
-  # setup interrupt i& exception delegation for supervisor mode
-  li t0, 0xc0000000 # 3 GiB (entry address of supervisor)
-  li t1, 0x1000
-  #li t2, 0x300 # bit 8 & 9 is for ecall from user & supervisor mode
-  #li t3, 0x222
-  csrw mepc, t0
-  csrc mstatus, t1
-  #csrs medeleg, t2
-  #csrs mideleg, t3
-
-  # pass mhartid as first parameter to supervisor
-  csrr a0, mhartid
-
-1:
-  mret
-</pre>
-
-I'm guessing that this is a bug in your guest as it hasn't configured PMP regions.
-
-From the RISC-V spec:
-
-"
-If no PMP entry matches an M-mode access, the access succeeds. If no PMP entry matches an
-S-mode or U-mode access, but at least one PMP entry is implemented, the access fails.
-"
-
-Confusingly implemented here means implemented in hardware, not just configured.
-
-You can check this by reverting this QEMU commit:
-
-commit d102f19a2085ac931cb998e6153b73248cca49f1
-Author: Atish Patra <email address hidden>
-Date:   Wed Dec 23 11:25:53 2020 -0800
-
-    target/riscv/pmp: Raise exception if no PMP entry is configured
-    
-    As per the privilege specification, any access from S/U mode should fail
-    if no pmp region is configured.
-    
-    Signed-off-by: Atish Patra <email address hidden>
-    Reviewed-by: Alistair Francis <email address hidden>
-    Message-id: <email address hidden>
-    Signed-off-by: Alistair Francis <email address hidden>
-
-
-Hello Francis,
-
-I'll configure PMP than do the test again. Sorry I hadn't understood what
-changed between version 5.2 and 6.0-rc2, since my code worked before.
-
-Best regards,
-Teodori Serge
-
-On Thu, 15 Apr 2021, 06:15 Alistair Francis, <email address hidden>
-wrote:
-
-> I'm guessing that this is a bug in your guest as it hasn't configured
-> PMP regions.
->
-> >From the RISC-V spec:
->
-> "
-> If no PMP entry matches an M-mode access, the access succeeds. If no PMP
-> entry matches an
-> S-mode or U-mode access, but at least one PMP entry is implemented, the
-> access fails.
-> "
->
-> Confusingly implemented here means implemented in hardware, not just
-> configured.
->
-> ** Changed in: qemu
->        Status: Confirmed => Invalid
->
-> --
-> You received this bug notification because you are subscribed to the bug
-> report.
-> https://bugs.launchpad.net/bugs/1923197
->
-> Title:
->   RISC-V priviledged instruction error
->
-> To manage notifications about this bug go to:
-> https://bugs.launchpad.net/qemu/+bug/1923197/+subscriptions
->
-
-
-We fixed a bug to make QEMU act more like hardware, which now means that PMP must be configured in M-mode.
-
-Hello Francis,
-
-Yes thank you. I added code to setup a basic PMP and it works now. Thank
-you and best regards,
-
-Teodori Serge
-
-On Sun, 18 Apr 2021, 05:55 Alistair Francis, <email address hidden>
-wrote:
-
-> We fixed a bug to make QEMU act more like hardware, which now means that
-> PMP must be configured in M-mode.
->
-> --
-> You received this bug notification because you are subscribed to the bug
-> report.
-> https://bugs.launchpad.net/bugs/1923197
->
-> Title:
->   RISC-V priviledged instruction error
->
-> To manage notifications about this bug go to:
-> https://bugs.launchpad.net/qemu/+bug/1923197/+subscriptions
->
-
-