linux-kernel - Re: [PATCH v4] riscv: add userland instruction dump to RISC-V splats

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Message-ID: <878ra8o4qa.fsf@all.your.base.are.belong.to.us>
Date:   Fri, 18 Aug 2023 15:33:01 +0200
From:   Björn Töpel <bjorn@...nel.org>
To:     Yunhui Cui <cuiyunhui@...edance.com>, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, guoren@...nel.org,
        bjorn@...osinc.com, conor.dooley@...rochip.com, jszhang@...nel.org,
        andy.chiu@...ive.com, cuiyunhui@...edance.com,
        dave.hansen@...ux.intel.com, elver@...gle.com, glider@...gle.com,
        cyphar@...har.com, kirill.shutemov@...ux.intel.com,
        keescook@...omium.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] riscv: add userland instruction dump to RISC-V splats

Yunhui Cui <cuiyunhui@...edance.com> writes:

> Add userland instruction dump and rename dump_kernel_instr()
> to dump_instr().
>
> An example:
> [    0.822439] Freeing unused kernel image (initmem) memory: 6916K
> [    0.823817] Run /init as init process
> [    0.839411] init[1]: unhandled signal 4 code 0x1 at 0x000000000005be18 in bb[10000+5fb000]
> [    0.840751] CPU: 0 PID: 1 Comm: init Not tainted 5.14.0-rc4-00049-gbd644290aa72-dirty #187
> [    0.841373] Hardware name:  , BIOS
> [    0.841743] epc : 000000000005be18 ra : 0000000000079e74 sp : 0000003fffcafda0
> [    0.842271]  gp : ffffffff816e9dc8 tp : 0000000000000000 t0 : 0000000000000000
> [    0.842947]  t1 : 0000003fffc9fdf0 t2 : 0000000000000000 s0 : 0000000000000000
> [    0.843434]  s1 : 0000000000000000 a0 : 0000003fffca0190 a1 : 0000003fffcafe18
> [    0.843891]  a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
> [    0.844357]  a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000000000000
> [    0.844803]  s2 : 0000000000000000 s3 : 0000000000000000 s4 : 0000000000000000
> [    0.845253]  s5 : 0000000000000000 s6 : 0000000000000000 s7 : 0000000000000000
> [    0.845722]  s8 : 0000000000000000 s9 : 0000000000000000 s10: 0000000000000000
> [    0.846180]  s11: 0000000000d144e0 t3 : 0000000000000000 t4 : 0000000000000000
> [    0.846616]  t5 : 0000000000000000 t6 : 0000000000000000
> [    0.847204] status: 0000000200000020 badaddr: 00000000f0028053 cause: 0000000000000002
> [    0.848219] Code: f06f ff5f 3823 fa11 0113 fb01 2e23 0201 0293 0000 (8053) f002
> [    0.851016] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
>
> Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>

Nice!

Reviewed-by: Björn Töpel <bjorn@...osinc.com>