powerpc: introduce macro LOAD_REG_ADDR_PIC
This is used to get the address of a variable when the kernel is not running at the linked or relocated address. Signed-off-by: Kevin Hao <haokexin@gmail.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
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@ -295,6 +295,11 @@ n:
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* you want to access various offsets within it). On ppc32 this is
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* identical to LOAD_REG_IMMEDIATE.
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*
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* LOAD_REG_ADDR_PIC(rn, name)
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* Loads the address of label 'name' into register 'run'. Use this when
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* the kernel doesn't run at the linked or relocated address. Please
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* note that this macro will clobber the lr register.
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*
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* LOAD_REG_ADDRBASE(rn, name)
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* ADDROFF(name)
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* LOAD_REG_ADDRBASE loads part of the address of label 'name' into
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@ -305,6 +310,14 @@ n:
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* LOAD_REG_ADDRBASE(rX, name)
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* ld rY,ADDROFF(name)(rX)
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*/
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/* Be careful, this will clobber the lr register. */
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#define LOAD_REG_ADDR_PIC(reg, name) \
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bl 0f; \
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0: mflr reg; \
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addis reg,reg,(name - 0b)@ha; \
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addi reg,reg,(name - 0b)@l;
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#ifdef __powerpc64__
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#define LOAD_REG_IMMEDIATE(reg,expr) \
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lis reg,(expr)@highest; \
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