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From: Eric DeVolder <eric_devolder@yahoo.com>
To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: riscv disassembler error with pmpcfg0
Date: Wed, 3 Apr 2024 18:16:46 +0000 (UTC)	[thread overview]
Message-ID: <183897139.5301881.1712168206289@mail.yahoo.com> (raw)
In-Reply-To: 183897139.5301881.1712168206289.ref@mail.yahoo.com

I've been using QEMU8 to collect instruction information on U-Boot + OpenSBI.

I'm running QEMU in this fashion to collect the information:

# qemu-system-riscv64 -plugin file=qemu/build/contrib/plugins/libexeclog.so -singlestep -d plugin,nochain -D execlog.txt ...

When examining the instruction trace in execlog, I've noticed that the disassembly for pmpcfg0 is erroneous, for example:

0, 0x5456, 0x3a002573, "csrrs                   a0,pmpcfg3,zero"

the CSR encoded in the instruction above is 0x3a0, which is pmpcfg0 (which also matches the code I'm examining).

For the Uboot+OpenSBI code I'm examining, pmpcfg0/3 is the only one that appears to have a problem.

I also checked QEMU9 and it behaves as described above as well.

I'm willing to provide a fix if I can get some advice/pointers on how this disassembly statement is generated...I did take a quick look but it didn't appear obvious how...

Thanks,
eric


       reply	other threads:[~2024-04-03 19:02 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <183897139.5301881.1712168206289.ref@mail.yahoo.com>
2024-04-03 18:16 ` Eric DeVolder [this message]
2024-05-14  5:19   ` riscv disassembler error with pmpcfg0 Alistair Francis
2024-05-16 11:30     ` Eric DeVolder

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