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121 lines
5.6 KiB
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121 lines
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Mon, 14 May 2012 13:42:37 +1000 (EST)
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Message-ID: <1336966957.6727.15.camel@pasglop>
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Subject: [PATCH] grub: Fix module trampoline for powerpc
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From: Benjamin Herrenschmidt <benh@au1.ibm.com>
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To: Brent Baude <baude@us.ibm.com>, pjones@fedoraproject.org
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Cc: hamzy@us.ibm.com, Josh Boyer <jwboyer@gmail.com>
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Date: Mon, 14 May 2012 13:42:37 +1000
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X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12
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X-Scanned-By: MIMEDefang 2.68 on 10.5.110.17
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X-Scanned-By: MIMEDefang 2.67 on 10.11.45.6
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[ --- snip --- ]
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Not sure who to send that to, I picked Peter as he's in
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the rpm log as author of the of the powerpc patches,
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feel free to do whatever with that one, it should ultimately
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go to upstream grub I suppose ...
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Without this, grub doesn't work for me at all with fc17 beta
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[ --- snip --- ]
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The trampoline generated by grub powerpc's dl.c to call from
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modules into the main grub code uses r0 as a scratch register.
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However, nowadays, gcc can (and will) generate function calls
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to spill registers to the stack (well, it's even stupid enough
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to do it when there's only one register to save ! go figure....)
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Those calls happen during the function prolog, before the
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return address has been saved on the stack, typically it's held
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in r0 at this stage. Since those calls will hit the trampoline
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in grub, which clobbers r0, this will clobber the return address
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and cause a crash.
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This patch changes the trampolines to use r12 instead which
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is safe to use in our case.
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Note: It might be better to actually link those low level gcc
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support functions statically into the modules but that's beyond
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the level of grub hacking I'm prepared to do today.
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Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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---
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diff --git a/grub-core/kern/powerpc/dl.c b/grub-core/kern/powerpc/dl.c
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index b8a2b50..0a8ec85 100644
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--- a/grub-core/kern/powerpc/dl.c
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+++ b/grub-core/kern/powerpc/dl.c
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@@ -89,9 +89,9 @@ struct trampoline
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static const struct trampoline trampoline_template =
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{
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- 0x3c000000,
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- 0x60000000,
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- 0x7c0903a6,
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+ 0x3d800000,
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+ 0x618c0000,
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+ 0x7d8903a6,
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0x4e800420,
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};
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