From: Christian Borntraeger <borntraeger@linux.ibm.com>
To: Thomas Huth <thuth@redhat.com>, qemu-devel@nongnu.org
Cc: qemu-s390x@nongnu.org, mrezanin@redhat.com,
"Cédric Le Goater" <clg@kaod.org>
Subject: Re: [PATCH 2/4] pc-bios/s390-ccw: Provide space for initial stack frame in start.S
Date: Mon, 26 Jun 2023 16:46:16 +0200 [thread overview]
Message-ID: <0beb8843-994c-b883-31e8-3a9542a90a74@linux.ibm.com> (raw)
In-Reply-To: <20230626132138.87668-3-thuth@redhat.com>
Am 26.06.23 um 15:21 schrieb Thomas Huth:
> Providing the space of a stack frame is the duty of the caller,
> so we should reserve 160 bytes before jumping into the main function.
> Otherwise the main() function might write past the stack array.
>
> While we're at it, add a proper STACK_SIZE macro for the stack size
> instead of using magic numbers (this is also required for the following
> patch).
>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
> pc-bios/s390-ccw/start.S | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
> index d29de09cc6..29b0a9ece0 100644
> --- a/pc-bios/s390-ccw/start.S
> +++ b/pc-bios/s390-ccw/start.S
> @@ -10,10 +10,12 @@
> * directory.
> */
>
> +#define STACK_SIZE 0x8000
> +
> .globl _start
> _start:
>
> - larl %r15,stack + 0x8000 /* Set up stack */
> + larl %r15,stack + STACK_SIZE - 160 /* Set up stack */
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
next prev parent reply other threads:[~2023-06-26 14:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-26 13:21 [PATCH 0/4] pc-bios/s390-ccw: Fixes and improvements for start.S Thomas Huth
2023-06-26 13:21 ` [PATCH 1/4] pc-bios/s390-ccw: Fix indentation in start.S Thomas Huth
2023-06-26 13:40 ` Cédric Le Goater
2023-06-26 13:21 ` [PATCH 2/4] pc-bios/s390-ccw: Provide space for initial stack frame " Thomas Huth
2023-06-26 13:41 ` Cédric Le Goater
2023-06-26 14:46 ` Christian Borntraeger [this message]
2023-06-26 13:21 ` [PATCH 3/4] pc-bios/s390-ccw: Move the stack array into start.S Thomas Huth
2023-06-26 14:54 ` Christian Borntraeger
2023-06-26 15:25 ` Richard Henderson
2023-06-27 6:55 ` Thomas Huth
2023-06-26 13:21 ` [PATCH 4/4] pc-bios/s390-ccw: Don't use __bss_start with the "larl" instruction Thomas Huth
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