[PATCH kexec-tools] ppc64: correct @ha relocation

[Milton Miller]

The @ha relocation is supposed to account for the @l relocation being
a signed quantity by adding 1 if the msb of @l is set.

The trick of adding 0x8000 stolen from the linux kernel file
arch/powerpc/kernel/module_64.c which credits binutils.

Signed-off-by: Milton Miller <miltonm at bga.com>

--- 
This relocation is used in v2wrap.S to hold and release the slave cpus.
Without this fix the memory location may be 64k off the initialized variable
which is checked against 0.


--- kexec-tools-testing/kexec/arch/ppc64/kexec-elf-rel-ppc64.c.orig	2007-04-10 22:29:59.000000000 -0500
+++ kexec-tools-testing/kexec/arch/ppc64/kexec-elf-rel-ppc64.c	2007-04-10 22:29:59.000000000 -0500
@@ -97,7 +97,7 @@ void machine_apply_elf_rel(struct mem_eh
 		break;
 
 	case R_PPC64_ADDR16_HA:
-		*(uint16_t *)location = ((value>>16)  & 0xffff);
+		*(uint16_t *)location = (((value+0x8000)>>16)  & 0xffff);
 		break;
 
 	case R_PPC64_ADDR16_HIGHEST: