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List:       linux-mips
Subject:    Re: [PATCH 6/9] MIPS: Call relocate_kernel if CONFIG_RELOCATABLE=y
From:       Sergei Shtylyov <sergei.shtylyov () cogentembedded ! com>
Date:       2015-12-03 17:46:14
Message-ID: 56607FE6.7040001 () cogentembedded ! com
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On 12/03/2015 05:53 PM, Matt Redfearn wrote:

>>> If CONFIG_RELOCATABLE is enabled, jump to 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>
>>> ---
>>>   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
>>
>>    Can't you account for it in the previous PTR_LI?

> During relocate_kernel, $28, pointer to the current thread,

    Ah, it's a register! I thought it was an immediate. Nevermind then. :-)

[...]

MBR, Sergei


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