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powerpc: Handle new ELFv2 module relocations 

The new ELF ABI tends to use R_PPC64_REL16_LO and R_PPC64_REL16_HA
relocations (PC-relative), so implement them.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2014-03-18 19:59:27 +10:30 committed by Anton Blanchard
parent 4edebbeae3
commit 0906584a0a
2 changed files with 23 additions and 1 deletions
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7
arch/powerpc/include/uapi/asm/elf.h
View File

@ -295,8 +295,13 @@ do { \
#define R_PPC64_TLSLD 108
#define R_PPC64_TOCSAVE 109
#define R_PPC64_REL16 249
#define R_PPC64_REL16_LO 250
#define R_PPC64_REL16_HI 251
#define R_PPC64_REL16_HA 252
/* Keep this the last entry. */
#define R_PPC64_NUM 110
#define R_PPC64_NUM 253
/* There's actually a third entry here, but it's unused */
struct ppc64_opd_entry

17
arch/powerpc/kernel/module_64.c
View File

@ -491,6 +491,23 @@ int apply_relocate_add(Elf64_Shdr *sechdrs,
*/
break;
case R_PPC64_REL16_HA:
/* Subtract location pointer */
value -= (unsigned long)location;
value = ((value + 0x8000) >> 16);
*((uint16_t *) location)
= (*((uint16_t *) location) & ~0xffff)
| (value & 0xffff);
break;
case R_PPC64_REL16_LO:
/* Subtract location pointer */
value -= (unsigned long)location;
*((uint16_t *) location)
= (*((uint16_t *) location) & ~0xffff)
| (value & 0xffff);
break;
default:
printk("%s: Unknown ADD relocation: %lu\n",
me->name,