openrisc: head: Init r0 to 0 on start
Originally openrisc spec 0 specified that r0 would be wired to ground. This is no longer the case. r0 is not guaranteed to be 0 at init, so we need to initialize it to 0 before using it. Also, if we are clearing r0 we cant use r0 to clear itself. Change the the CLEAR_GPR macro to use movhi for clearing. Reported-by: Jakob Viketoft <jakob.viketoft@aacmicrotec.com> Signed-off-by: Stafford Horne <shorne@gmail.com>
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@ -35,7 +35,7 @@
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l.add rd,rd,rs
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#define CLEAR_GPR(gpr) \
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l.or gpr,r0,r0
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l.movhi gpr,0x0
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#define LOAD_SYMBOL_2_GPR(gpr,symbol) \
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l.movhi gpr,hi(symbol) ;\
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@ -443,6 +443,9 @@ _dispatch_do_ipage_fault:
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__HEAD
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.global _start
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_start:
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/* Init r0 to zero as per spec */
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CLEAR_GPR(r0)
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/* save kernel parameters */
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l.or r25,r0,r3 /* pointer to fdt */
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