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| author | Catalin Marinas <catalin.marinas@arm.com> | 2009-07-24 11:32:59 (GMT) |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2009-07-24 11:32:59 (GMT) |
| commit | adca6dc23bc620ea95392659625200a252b97be3 (patch) | |
| tree | baf8826c30b10e85a77a76a11f7e744182afeed4 /arch/arm/include | |
| parent | 0e056f20f18d0efa5da920f3cf8532adc56d5779 (diff) | |
| download | linux-adca6dc23bc620ea95392659625200a252b97be3.tar.xz | |
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.h | 3 | ||||
| -rw-r--r-- | arch/arm/include/asm/memory.h | 6 |
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 |