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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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