From: Miles Chen <miles.chen@mediatek.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Matthias Brugger <matthias.bgg@gmail.com>
Cc: Miles Chen <miles.chen@mediatek.com>,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, wsd_upstream@mediatek.com
Subject: [PATCH] arm64: kaslr: print PHYS_OFFSET in dump_kernel_offset()
Date: Wed, 12 Dec 2018 18:56:49 +0800 [thread overview]
Message-ID: <1544612209-13660-1-git-send-email-miles.chen@mediatek.com> (raw)
When debug with kaslr, it is sometimes necessary to have PHYS_OFFSET to
perform linear virtual address to physical address translation.
Sometimes we're debugging with only few information such as a kernel log
and a symbol file, print PHYS_OFFSET in dump_kernel_offset() for that case.
Tested by:
echo c > /proc/sysrq-trigger
[ 11.996161] SMP: stopping secondary CPUs
[ 11.996732] Kernel Offset: 0x2522200000 from 0xffffff8008000000
[ 11.996881] PHYS_OFFSET: 0xffffffeb40000000
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Tested-by: Miles Chen <miles.chen@mediatek.com>
---
arch/arm64/kernel/setup.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index f4fc1e0544b7..4b0e1231625c 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -388,6 +388,7 @@ static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
offset, KIMAGE_VADDR);
+ pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
} else {
pr_emerg("Kernel Offset: disabled\n");
}
--
2.18.0
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next reply other threads:[~2018-12-12 10:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-12 10:56 Miles Chen [this message]
2018-12-13 18:13 ` [PATCH] arm64: kaslr: print PHYS_OFFSET in dump_kernel_offset() Will Deacon
2018-12-13 18:15 ` Ard Biesheuvel
2018-12-14 0:52 ` Miles Chen
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