diff options
author | Jon Medhurst <tixy@yxit.co.uk> | 2011-06-10 20:29:04 +0100 |
---|---|---|
committer | Tixy <tixy@medhuaa1.miniserver.com> | 2011-07-13 17:32:45 +0000 |
commit | 263e368a2f1f960db07d7524a4a3e7df951f1f72 (patch) | |
tree | eb8b1ba0a5d07368de5bd65b579a5f69233ddb07 /arch/arm/kernel/kprobes.h | |
parent | f39ca8b488a6c1e8db47746e1cdb841a6999edd7 (diff) | |
download | linux-263e368a2f1f960db07d7524a4a3e7df951f1f72.tar.gz |
ARM: kprobes: Add load_write_pc()
This writes a value to PC which was obtained as the result of a
LDR or LDM instruction. For ARMv5T and later this must perform
interworking.
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Diffstat (limited to 'arch/arm/kernel/kprobes.h')
-rw-r--r-- | arch/arm/kernel/kprobes.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/kernel/kprobes.h b/arch/arm/kernel/kprobes.h index 12627a376bf6..5d6bf0d0a18a 100644 --- a/arch/arm/kernel/kprobes.h +++ b/arch/arm/kernel/kprobes.h @@ -109,6 +109,30 @@ static inline void __kprobes bx_write_pc(long pcv, struct pt_regs *regs) regs->ARM_pc = pcv; } + +#if __LINUX_ARM_ARCH__ >= 6 + +/* Kernels built for >= ARMv6 should never run on <= ARMv5 hardware, so... */ +#define load_write_pc_interworks true +#define test_load_write_pc_interworking() + +#else /* __LINUX_ARM_ARCH__ < 6 */ + +/* We need run-time testing to determine if load_write_pc() should interwork. */ +extern bool load_write_pc_interworks; +void __init test_load_write_pc_interworking(void); + +#endif + +static inline void __kprobes load_write_pc(long pcv, struct pt_regs *regs) +{ + if (load_write_pc_interworks) + bx_write_pc(pcv, regs); + else + regs->ARM_pc = pcv; +} + + void __kprobes kprobe_simulate_nop(struct kprobe *p, struct pt_regs *regs); void __kprobes kprobe_emulate_none(struct kprobe *p, struct pt_regs *regs); |