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Message-ID: <1459415142-3412-7-git-send-email-matt.redfearn@imgtec.com>
Date: Thu, 31 Mar 2016 10:05:37 +0100
From: Matt Redfearn <matt.redfearn@...tec.com>
To: Ralf Baechle <ralf@...ux-mips.org>
CC: <linux-mips@...ux-mips.org>, <kernel-hardening@...ts.openwall.com>, "Matt
Redfearn" <matt.redfearn@...tec.com>, <linux-kernel@...r.kernel.org>, "Jonas
Gorski" <jogo@...nwrt.org>
Subject: [PATCH v2 06/11] MIPS: Call relocate_kernel if CONFIG_RELOCATABLE=y
If CONFIG_RELOCATABLE is enabled, call relocate_kernel.
This function will return the entry point of the relocated kernel if
copy/relocate is sucessful or the original entry point if not. The stack
pointer must then be pointed into the new image.
Signed-off-by: Matt Redfearn <matt.redfearn@...tec.com>
---
Changes in v2: None
arch/mips/kernel/head.S | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index 4e4cc5b9a771..7dc043349d66 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -132,7 +132,27 @@ not_found:
set_saved_sp sp, t0, t1
PTR_SUBU sp, 4 * SZREG # init stack pointer
+#ifdef CONFIG_RELOCATABLE
+ /* Copy kernel and apply the relocations */
+ jal relocate_kernel
+
+ /* Repoint the sp into the new kernel image */
+ PTR_LI sp, _THREAD_SIZE - 32 - PT_SIZE
+ PTR_ADDU sp, $28
+ set_saved_sp sp, t0, t1
+ PTR_SUBU sp, 4 * SZREG # init stack pointer
+
+ /*
+ * relocate_kernel returns the entry point either
+ * in the relocated kernel or the original if for
+ * some reason relocation failed - jump there now
+ * with instruction hazard barrier because of the
+ * newly sync'd icache.
+ */
+ jr.hb v0
+#else
j start_kernel
+#endif
END(kernel_entry)
#ifdef CONFIG_SMP
--
2.5.0
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