From: Richard Henderson <richard.henderson@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>,
Laurent Vivier <laurent@vivier.eu>
Subject: Re: [PATCH v4 05/25] linux-user/arm: Implement setup_sigtramp
Date: Tue, 28 Sep 2021 08:28:39 -0400 [thread overview]
Message-ID: <3044403d-7bfb-b935-8d5f-ab5bcd1362c2@linaro.org> (raw)
In-Reply-To: <CAFEAcA9Neuczc-g_xbe-NELJ+rejJTPF=7TUJe7=T9q-id0=TA@mail.gmail.com>
On 9/28/21 5:31 AM, Peter Maydell wrote:
>> + uint32_t *host_rc = g2h_untagged(retcode);
>
> ...but here we treat it as a normal guest address that we can
> convert into a host address and dereference. If the signal handler
> is being entered in Thumb mode this will be a misaligned pointer.
Oops, yes.
I've no idea why the kernel works so hard to match the mode of the signal handler to the
mode of the trampoline, but I presume it's ABI at this point.
r~
next prev parent reply other threads:[~2021-09-28 12:32 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-28 2:00 [PATCH v4 00/25] linux-user: Move signal trampolines to new page Richard Henderson
2021-09-28 2:00 ` [PATCH v4 01/25] linux-user: Add infrastructure for a signal trampoline page Richard Henderson
2021-09-28 2:00 ` [PATCH v4 02/25] linux-user/aarch64: Implement setup_sigtramp Richard Henderson
2021-09-28 2:00 ` [PATCH v4 03/25] linux-user/arm: Drop v1 signal frames Richard Henderson
2021-09-28 2:00 ` [PATCH v4 04/25] linux-user/arm: Drop "_v2" from symbols in signal.c Richard Henderson
2021-09-28 2:00 ` [PATCH v4 05/25] linux-user/arm: Implement setup_sigtramp Richard Henderson
2021-09-28 9:31 ` Peter Maydell
2021-09-28 12:28 ` Richard Henderson [this message]
2021-09-28 2:00 ` [PATCH v4 06/25] linux-user/alpha: " Richard Henderson
2021-09-28 2:00 ` [PATCH v4 07/25] linux-user/cris: " Richard Henderson
2021-09-28 2:00 ` [PATCH v4 08/25] linux-user/hexagon: " Richard Henderson
2021-09-28 2:00 ` [PATCH v4 09/25] linux-user/hppa: Document non-use of setup_sigtramp Richard Henderson
2021-09-28 2:00 ` [PATCH v4 10/25] linux-user/i386: Implement setup_sigtramp Richard Henderson
2021-09-28 6:51 ` Philippe Mathieu-Daudé
2021-09-28 2:00 ` [PATCH v4 11/25] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set Richard Henderson
2021-09-28 2:00 ` [PATCH v4 12/25] linux-user/m68k: Implement setup_sigtramp Richard Henderson
2021-09-28 2:00 ` [PATCH v4 13/25] linux-user/microblaze: " Richard Henderson
2021-09-28 2:00 ` [PATCH v4 14/25] linux-user/mips: Tidy install_sigtramp Richard Henderson
2021-09-28 2:00 ` [PATCH v4 15/25] linux-user/mips: Implement setup_sigtramp Richard Henderson
2021-09-28 2:00 ` [PATCH v4 16/25] linux-user/nios2: Document non-use of setup_sigtramp Richard Henderson
2021-09-28 9:24 ` Peter Maydell
2021-09-28 2:00 ` [PATCH v4 17/25] linux-user/openrisc: Implement setup_sigtramp Richard Henderson
2021-09-28 2:00 ` [PATCH v4 18/25] linux-user/ppc: Simplify encode_trampoline Richard Henderson
2021-09-28 2:00 ` [PATCH v4 19/25] linux-user/ppc: Implement setup_sigtramp Richard Henderson
2021-09-28 2:00 ` [PATCH v4 20/25] linux-user/riscv: " Richard Henderson
2021-09-28 2:00 ` [PATCH v4 21/25] linux-user/s390x: " Richard Henderson
2021-09-28 2:00 ` [PATCH v4 22/25] linux-user/sh4: " Richard Henderson
2021-09-28 2:00 ` [PATCH v4 23/25] linux-user/sparc: " Richard Henderson
2021-09-28 6:54 ` Philippe Mathieu-Daudé
2021-09-29 7:17 ` Mark Cave-Ayland
2021-09-28 2:00 ` [PATCH v4 24/25] linux-user/xtensa: " Richard Henderson
2021-09-28 2:00 ` [PATCH v4 25/25] linux-user: Remove default for TARGET_ARCH_HAS_SIGTRAMP_PAGE Richard Henderson
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