diff options
| author | Matt Redfearn <matt.redfearn@imgtec.com> | 2016-03-31 10:05:37 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-05-13 14:02:03 +0200 |
| commit | af09ab5e3fa7b6e137b135325a2ca00d57b4aea2 (patch) | |
| tree | 886526dd3d5f18252d9e55c3f547121c3de0d27b /arch/mips/kernel/head.S | |
| parent | 279b991b24d2439fbe9d2f093988b9c8aed2603d (diff) | |
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@imgtec.com>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: kernel-hardening@lists.openwall.com
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12984/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/head.S')
| -rw-r--r-- | arch/mips/kernel/head.S | 20 |
1 files changed, 20 insertions, 0 deletions
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 |