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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
	Paul Burton <paulburton@kernel.org>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Christian Brauner <christian.brauner@canonical.com>
Subject: Re: [PATCH] mips: vdso: conditionalize 32-bit time functions on COMPAT_32BIT_TIME
Date: Mon, 30 Dec 2019 16:58:17 +0100	[thread overview]
Message-ID: <CAHmME9rnnoFwh=EHAgdQFM+c33D9mgCoVML_+d=Js=pXPnsxKQ@mail.gmail.com> (raw)
In-Reply-To: <CAK8P3a0NBuqDX63+920q7Q+yO2xCoSd0O7xUDJv6BBoco2kVOg@mail.gmail.com>

Makes sense w.r.t. time32 situation.

I still think that in spite of that there's still something weird
happening with the mips VDSO.

Here's a register dump before the call:

 $ 0   : 0000000000000000 0000000000000001 0000000010000000 fffffffffffffffc
 $ 4   : 0000000000000002 000000007fff2e40 0000000000000000 0000000000000001
 $ 8   : 0000000000000000 0000000000000000 0000000000000000 0000000000000000
 $12   : 0000000000000000 000000000000000a ffffffff80000000 000000007fffffda
 $16   : 0000000010001ba8 0000005800000015 0000000010000000 0000000010000000
 $20   : 0000000010000000 0000000010000000 0000000000000000 0000000077ff2ae8
 $24   : 0000000000000005 0000000077fa1d18
 $28   : 0000000010019cf0 000000007fff2e40 0000000000000000 0000000010000c30
 Hi    : 0000000000000000
 Lo    : 0000000000000000
 epc   : 0000000077fa1d18 0x77fa1d18
 ra    : 0000000010000c30 0x10000c30

And here it is immediately after:

 $ 0   : 0000000000000000 0000000000000001 ffffffffffffffa7 000000007fff5000
 $ 4   : 0000000000000002 000000007fff2e40 0000000077ff2000 0000000000000001
 $ 8   : 0000000000000006 0000000000000020 0000000000000002 0000000000000000
 $12   : 0000000000000000 0000000000001852 ffffffff80156160 000000007fffffda
 $16   : 0000000010001ba8 0000005800000015 0000000010000000 0000000010000000
 $20   : 0000000010000000 0000000010000000 0000000000000000 0000000077ff2b00
 $24   : 0000000000000005 0000000000000000
 $28   : 000000007fff5000 000000007fff2e30 0000000000000000 0000000077fa1e00
 Hi    : 0000000000000000
 Lo    : 0000000000000000
 epc   : 0000000077fa1e00 0x77fa1e00
 ra    : 0000000077fa1e00 0x77fa1e00

I wonder if a toolchain option or compiler bug or something is causing
the vdso to not restore certain registers (gp? ra?).

  reply	other threads:[~2019-12-30 15:58 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-23 13:08 vdso-related userspace crashes on 5.5 mips64 Jason A. Donenfeld
2019-12-23 21:44 ` Jason A. Donenfeld
2019-12-23 23:29 ` Paul Burton
2019-12-24 13:37   ` Jason A. Donenfeld
2019-12-30 15:58     ` Arnd Bergmann
2019-12-24 14:19   ` Jason A. Donenfeld
2019-12-24 13:54 ` [PATCH] mips: vdso: conditionalize 32-bit time functions on COMPAT_32BIT_TIME Jason A. Donenfeld
2019-12-30 11:57   ` Arnd Bergmann
2019-12-30 12:26     ` Jason A. Donenfeld
2019-12-30 12:34       ` Arnd Bergmann
2019-12-30 14:37         ` Jason A. Donenfeld
2019-12-30 15:10           ` Jason A. Donenfeld
2019-12-30 15:37           ` Arnd Bergmann
2019-12-30 15:39             ` Jason A. Donenfeld
2019-12-30 15:47               ` Arnd Bergmann
2019-12-30 15:58                 ` Jason A. Donenfeld [this message]
2019-12-30 17:33                   ` Arnd Bergmann
2019-12-30 21:09                     ` Jason A. Donenfeld
2019-12-30 21:42                       ` Jason A. Donenfeld
2019-12-31 16:14                         ` Jason A. Donenfeld
2020-01-01  4:10                           ` Paul Burton
2020-01-01  4:25                             ` Paul Burton
2020-01-01  9:47                               ` Jason A. Donenfeld
2020-01-01  9:47                             ` Jason A. Donenfeld

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