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powerpc: mtspr/mtmsr should take an unsigned long
Add a cast in case the caller passes in a different type, as it would if mtspr/mtmsr were functions. Previously, if a 64-bit type was passed in on 32-bit, GCC would bind the constraint to a pair of registers, and would substitute the first register in the pair in the asm code. This corresponds to the upper half of the 64-bit register, which is generally not the desired behavior. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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1 changed files with 5 additions and 2 deletions
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@ -1024,13 +1024,16 @@
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#define mtmsrd(v) __mtmsrd((v), 0)
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#define mtmsr(v) mtmsrd(v)
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#else
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#define mtmsr(v) asm volatile("mtmsr %0" : : "r" (v) : "memory")
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#define mtmsr(v) asm volatile("mtmsr %0" : \
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: "r" ((unsigned long)(v)) \
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: "memory")
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#endif
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#define mfspr(rn) ({unsigned long rval; \
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asm volatile("mfspr %0," __stringify(rn) \
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: "=r" (rval)); rval;})
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#define mtspr(rn, v) asm volatile("mtspr " __stringify(rn) ",%0" : : "r" (v)\
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#define mtspr(rn, v) asm volatile("mtspr " __stringify(rn) ",%0" : \
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: "r" ((unsigned long)(v)) \
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: "memory")
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#ifdef __powerpc64__
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