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authorPaul Gortmaker <paul.gortmaker@gmail.com>2009-05-07 16:18:40 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-05-07 17:21:01 +0100
commitae51e609843f7d0aaeb1c2ad9f89d252a4899885 (patch)
treeaf632106715c1c3db9c974fdecf6903e86eef1ed
parenta029b706d3b2d3a139bdeae84131d9a0f35f6478 (diff)
[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>
-rw-r--r--arch/arm/include/asm/elf.h16
-rw-r--r--arch/arm/kernel/module.c15
2 files changed, 24 insertions, 7 deletions
diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h
index d7da19bcf92..c207504de84 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.
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index d1731e39b49..bac03c81489 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -169,6 +169,21 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
*(u32 *)loc = offset & 0x7fffffff;
break;
+ case R_ARM_MOVW_ABS_NC:
+ case R_ARM_MOVT_ABS:
+ offset = *(u32 *)loc;
+ offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
+ offset = (offset ^ 0x8000) - 0x8000;
+
+ offset += sym->st_value;
+ if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
+ offset >>= 16;
+
+ *(u32 *)loc &= 0xfff0f000;
+ *(u32 *)loc |= ((offset & 0xf000) << 4) |
+ (offset & 0x0fff);
+ break;
+
default:
printk(KERN_ERR "%s: unknown relocation: %u\n",
module->name, ELF32_R_TYPE(rel->r_info));