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powerpc: Define and use PPC64_ELF_ABI_v2/v1

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We're approaching 20 locations where we need to check for ELF ABI v2.
That's fine, except the logic is a bit awkward, because we have to check
that _CALL_ELF is defined and then what its value is.

So check it once in asm/types.h and define PPC64_ELF_ABI_v2 when ELF ABI
v2 is detected.

We also have a few places where what we're really trying to check is
that we are using the 64-bit v1 ABI, ie. function descriptors. So also
add a #define for that, which simplifies several checks.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman
2016-06-06 22:26:10 +05:30
parent ac9cd1709c
commit f55d966536
16 changed files with 39 additions and 35 deletions
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2
arch/powerpc/kernel/misc_64.S
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@@ -661,7 +661,7 @@ _GLOBAL(kexec_sequence)
#ifndef CONFIG_PPC_BOOK3E
/* clear out hardware hash page table and tlb */
#if !defined(_CALL_ELF) || _CALL_ELF != 2
#ifdef PPC64_ELF_ABI_v1
ld r12,0(r27) /* deref function descriptor */
#else
mr r12,r27