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| author | Jon Medhurst | 2011-07-07 15:03:08 +0200 |
|---|---|---|
| committer | Tixy | 2011-07-13 19:32:48 +0200 |
| commit | 7be7ee2d295f6a069e1e92db95bf92eea2a173cf (patch) | |
| tree | 510fae54b9554bbef9a8e8d1443c11b1985dadba | |
| parent | ARM: kprobes: Add alu_write_pc() (diff) | |
| download | kernel-qcow2-linux-7be7ee2d295f6a069e1e92db95bf92eea2a173cf.tar.gz kernel-qcow2-linux-7be7ee2d295f6a069e1e92db95bf92eea2a173cf.tar.xz kernel-qcow2-linux-7be7ee2d295f6a069e1e92db95bf92eea2a173cf.zip | |
ARM: kprobes: Add BLX macro
This is for use by inline assembler which will be added to kprobes-arm.c
It saves memory when used on newer ARM architectures and also provides
correct interworking should ARM probes be required on Thumb kernels in
the future.
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
| -rw-r--r-- | arch/arm/kernel/kprobes-arm.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/kernel/kprobes-arm.c b/arch/arm/kernel/kprobes-arm.c index ea96214ef341..80a941100f8c 100644 --- a/arch/arm/kernel/kprobes-arm.c +++ b/arch/arm/kernel/kprobes-arm.c @@ -67,6 +67,13 @@ #define branch_displacement(insn) sign_extend(((insn) & 0xffffff) << 2, 25) +#if __LINUX_ARM_ARCH__ >= 6 +#define BLX(reg) "blx "reg" \n\t" +#else +#define BLX(reg) "mov lr, pc \n\t" \ + "mov pc, "reg" \n\t" +#endif + #define is_r15(insn, bitpos) (((insn) & (0xf << bitpos)) == (0xf << bitpos)) #define PSR_fs (PSR_f|PSR_s) |