[ARM] 5507/1: support R_ARM_MOVW_ABS_NC and MOVT_ABS relocation types

From: Bruce Ashfield <bruce.ashfield@windriver.com>

To fully support the armv7-a instruction set/optimizations, support
for the R_ARM_MOVW_ABS_NC and R_ARM_MOVT_ABS relocation types is
required.

The MOVW and MOVT are both load-immediate instructions, MOVW loads 16
bits into the bottom half of a register, and MOVT loads 16 bits into the
top half of a register.

The relocation information for these instructions has a full 32 bit
value, plus an addend which is stored in the 16 immediate bits in the
instruction itself.  The immediate bits in the instruction are not
contiguous (the register # splits it into a 4 bit and 12 bit value),
so the addend has to be extracted accordingly and added to the value.
The value is then split and put into the instruction; a MOVW uses the
bottom 16 bits of the value, and a MOVT uses the top 16 bits.

Signed-off-by: David Borman <david.borman@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 9 insertions, 7 deletions

diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h
index d7da19bcf928..c207504de84d 100644
--- a/arch/arm/include/asm/elf.h
+++ b/arch/arm/include/asm/elf.h
@@ -45,13 +45,15 @@ typedef struct user_fp elf_fpregset_t;
 #define EF_ARM_HASENTRY         0x00000002      /* All */
 #define EF_ARM_RELEXEC          0x00000001      /* All */
 
-#define R_ARM_NONE      0
-#define R_ARM_PC24      1
-#define R_ARM_ABS32     2
-#define R_ARM_CALL      28
-#define R_ARM_JUMP24    29
-#define R_ARM_V4BX      40
-#define R_ARM_PREL31    42
+#define R_ARM_NONE              0
+#define R_ARM_PC24              1
+#define R_ARM_ABS32             2
+#define R_ARM_CALL              28
+#define R_ARM_JUMP24            29
+#define R_ARM_V4BX              40
+#define R_ARM_PREL31            42
+#define R_ARM_MOVW_ABS_NC       43
+#define R_ARM_MOVT_ABS          44
 
 /*
  * These are used to set parameters in the core dumps.