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| author | Jon Medhurst <tixy@yxit.co.uk> | 2011-03-26 20:19:07 +0100 |
|---|---|---|
| committer | Tixy <tixy@medhuaa1.miniserver.com> | 2011-07-13 19:32:40 +0200 |
| commit | 592201a9f154cdd5db59304d1369e94d8b551803 (patch) | |
| tree | e177ebb35bab0d1bfa2608335b4cd6d51bc3ecfb /arch/arm/include | |
| parent | ARM: Thumb-2: Fix exception return sequence to restore stack correctly (diff) | |
| download | linux-592201a9f154cdd5db59304d1369e94d8b551803.tar.xz linux-592201a9f154cdd5db59304d1369e94d8b551803.zip | |
ARM: Thumb-2: Support Thumb-2 in undefined instruction handler
This patch allows undef_hook's to be specified for 32-bit Thumb
instructions and also to be used for thumb kernel-side code.
32-bit Thumb instructions are specified in the form:
((first_half << 16 ) | second_half)
which matches the layout used by the ARM ARM.
ptrace was handling 32-bit Thumb instructions by hooking the first
halfword and manually checking the second half. This method would be
broken by this patch so it is migrated to make use of the new Thumb-2
support.
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/ptrace.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h index 312d10877bd7..d484871698da 100644 --- a/arch/arm/include/asm/ptrace.h +++ b/arch/arm/include/asm/ptrace.h @@ -200,6 +200,14 @@ extern unsigned long profile_pc(struct pt_regs *regs); #define PREDICATE_ALWAYS 0xe0000000 /* + * True if instr is a 32-bit thumb instruction. This works if instr + * is the first or only half-word of a thumb instruction. It also works + * when instr holds all 32-bits of a wide thumb instruction if stored + * in the form (first_half<<16)|(second_half) + */ +#define is_wide_instruction(instr) ((unsigned)(instr) >= 0xe800) + +/* * kprobe-based event tracer support */ #include <linux/stddef.h> |