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authorCatalin Marinas <catalin.marinas@arm.com>2009-07-24 12:32:59 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2009-07-24 12:32:59 +0100
commitadca6dc23bc620ea95392659625200a252b97be3 (patch)
treebaf8826c30b10e85a77a76a11f7e744182afeed4 /arch/arm/include
parent0e056f20f18d0efa5da920f3cf8532adc56d5779 (diff)
downloadop-kernel-dev-adca6dc23bc620ea95392659625200a252b97be3.zip
op-kernel-dev-adca6dc23bc620ea95392659625200a252b97be3.tar.gz
Thumb-2: Add support for loadable modules
Modules compiled to Thumb-2 have two additional relocations needing to be resolved at load time, R_ARM_THM_CALL and R_ARM_THM_JUMP24, for BL and B.W instructions. The maximum Thumb-2 addressing range is +/-2^24 (+/-16MB) therefore the MODULES_VADDR macro in asm/memory.h is set to (MODULES_END - 8MB) for the Thumb-2 compiled kernel. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/elf.h3
-rw-r--r--arch/arm/include/asm/memory.h6
2 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h
index c207504..c3b911e 100644
--- a/arch/arm/include/asm/elf.h
+++ b/arch/arm/include/asm/elf.h
@@ -55,6 +55,9 @@ typedef struct user_fp elf_fpregset_t;
#define R_ARM_MOVW_ABS_NC 43
#define R_ARM_MOVT_ABS 44
+#define R_ARM_THM_CALL 10
+#define R_ARM_THM_JUMP24 30
+
/*
* These are used to set parameters in the core dumps.
*/
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 85763db..376be1a 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -44,7 +44,13 @@
* The module space lives between the addresses given by TASK_SIZE
* and PAGE_OFFSET - it must be within 32MB of the kernel text.
*/
+#ifndef CONFIG_THUMB2_KERNEL
#define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
+#else
+/* smaller range for Thumb-2 symbols relocation (2^24)*/
+#define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024)
+#endif
+
#if TASK_SIZE > MODULES_VADDR
#error Top of user space clashes with start of module space
#endif
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