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From: Peter Maydell <peter.maydell@linaro.org>
To: "Philippe Mathieu-Daudé" <philmd@redhat.com>
Cc: qemu-arm <qemu-arm@nongnu.org>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"QEMU Developers" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH v2 01/15] target/arm/arm-semi: Capture errno in softmmu version of set_swi_errno()
Date: Fri, 4 Oct 2019 10:50:08 +0100	[thread overview]
Message-ID: <CAFEAcA9Qt++kGXTHiArfigjoZNmL=uLvDbZ9pCbcRgHP269sRg@mail.gmail.com> (raw)
In-Reply-To: <a10f43ac-82e8-7600-94d3-513feafaf325@redhat.com>

On Fri, 4 Oct 2019 at 00:24, Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>
> On 9/16/19 4:15 PM, Peter Maydell wrote:
> > The set_swi_errno() function is called to capture the errno
> > from a host system call, so that we can return -1 from the
> > semihosting function and later allow the guest to get a more
> > specific error code with the SYS_ERRNO function. It comes in
> > two versions, one for user-only and one for softmmu. We forgot
> > to capture the errno in the softmmu version; fix the error.
> >
> > (Semihosting calls directed to gdb are unaffected because
> > they go through a different code path that captures the
> > error return from the gdbstub call in arm_semi_cb() or
> > arm_semi_flen_cb().)
> >
>
> Fixes: 8e71621f784

That was the commit that added support for semihosting
to softmmu in 2007, so I don't think suggesting that this
is a 'fix' to that makes much sense. This has just been
broken forever. (It's also pretty unimportant as a bug because
the semihosting 'errno' is so ill-defined as to be unused,
I think.)

thanks
-- PMM


  reply	other threads:[~2019-10-04 10:58 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-16 14:15 [Qemu-devel] [PATCH v2 00/15] target/arm: Implement semihosting v2.0 Peter Maydell
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 01/15] target/arm/arm-semi: Capture errno in softmmu version of set_swi_errno() Peter Maydell
2019-10-03 23:24   ` Philippe Mathieu-Daudé
2019-10-04  9:50     ` Peter Maydell [this message]
2019-10-07 13:36   ` Richard Henderson
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 02/15] target/arm/arm-semi: Always set some kind of errno for failed calls Peter Maydell
2019-10-03 23:27   ` Philippe Mathieu-Daudé
2019-10-07 13:37   ` Richard Henderson
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 03/15] target/arm/arm-semi: Correct comment about gdb syscall races Peter Maydell
2019-10-07 14:06   ` Richard Henderson
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 04/15] target/arm/arm-semi: Make semihosting code hand out its own file descriptors Peter Maydell
2019-10-07 14:09   ` Richard Henderson
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 05/15] target/arm/arm-semi: Restrict use of TaskState* Peter Maydell
2019-10-07 14:12   ` Richard Henderson
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 06/15] target/arm/arm-semi: Use set_swi_errno() in gdbstub callback functions Peter Maydell
2019-10-03 23:29   ` Philippe Mathieu-Daudé
2019-10-07 14:13   ` Richard Henderson
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 07/15] target/arm/arm-semi: Factor out implementation of SYS_CLOSE Peter Maydell
2019-10-03 23:32   ` Philippe Mathieu-Daudé
2019-10-07 14:15   ` Richard Henderson
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 08/15] target/arm/arm-semi: Factor out implementation of SYS_WRITE Peter Maydell
2019-10-03 23:33   ` Philippe Mathieu-Daudé
2019-10-07 14:16   ` Richard Henderson
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 09/15] target/arm/arm-semi: Factor out implementation of SYS_READ Peter Maydell
2019-10-03 23:35   ` Philippe Mathieu-Daudé
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 10/15] target/arm/arm-semi: Factor out implementation of SYS_ISTTY Peter Maydell
2019-10-03 23:35   ` Philippe Mathieu-Daudé
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 11/15] target/arm/arm-semi: Factor out implementation of SYS_SEEK Peter Maydell
2019-10-03 23:37   ` Philippe Mathieu-Daudé
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 12/15] target/arm/arm-semi: Factor out implementation of SYS_FLEN Peter Maydell
2019-10-03 23:38   ` Philippe Mathieu-Daudé
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 13/15] target/arm/arm-semi: Implement support for semihosting feature detection Peter Maydell
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 14/15] target/arm/arm-semi: Implement SH_EXT_EXIT_EXTENDED extension Peter Maydell
2019-09-16 14:15 ` [Qemu-devel] [PATCH v2 15/15] target/arm/arm-semi: Implement SH_EXT_STDOUT_STDERR extension Peter Maydell
2019-10-03 13:03 ` [PATCH v2 00/15] target/arm: Implement semihosting v2.0 Peter Maydell

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