53 lines
1.7 KiB
Diff
53 lines
1.7 KiB
Diff
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From 5db331dc14cea38ceb96f7cd55365f7c7d326c29 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Tue, 27 Jun 2023 09:47:01 +0200
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Subject: [PATCH 3/4] pc-bios/s390-ccw: Provide space for initial stack frame
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in start.S
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Providing the space of a stack frame is the duty of the caller,
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so we should reserve 160 bytes before jumping into the main function.
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Otherwise the main() function might write past the stack array.
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While we're at it, add a proper STACK_SIZE macro for the stack size
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instead of using magic numbers (this is also required for the following
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patch).
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Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
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Reviewed-by: Cédric Le Goater <clg@redhat.com>
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Message-Id: <20230627074703.99608-3-thuth@redhat.com>
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Reviewed-by: Eric Farman <farman@linux.ibm.com>
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Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
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Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
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Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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(cherry picked from commit 74fe98ee7fb3344dbd085d1fa32c0dc2fc2c831f)
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---
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pc-bios/s390-ccw/start.S | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
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index d29de09cc6..abd6fe6639 100644
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--- a/pc-bios/s390-ccw/start.S
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+++ b/pc-bios/s390-ccw/start.S
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@@ -10,10 +10,13 @@
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* directory.
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*/
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+#define STACK_SIZE 0x8000
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+#define STACK_FRAME_SIZE 160
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+
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.globl _start
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_start:
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- larl %r15,stack + 0x8000 /* Set up stack */
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+ larl %r15,stack + STACK_SIZE - STACK_FRAME_SIZE /* Set up stack */
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/* clear bss */
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larl %r2,__bss_start
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--
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2.39.3
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