diff options
Diffstat (limited to 'arch/arm/net/bpf_jit_32.h')
| -rw-r--r-- | arch/arm/net/bpf_jit_32.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/net/bpf_jit_32.h b/arch/arm/net/bpf_jit_32.h index afb84621ff6f..b2d7d92859d3 100644 --- a/arch/arm/net/bpf_jit_32.h +++ b/arch/arm/net/bpf_jit_32.h @@ -114,6 +114,20 @@ #define ARM_INST_UMULL 0x00800090 +/* + * Use a suitable undefined instruction to use for ARM/Thumb2 faulting. + * We need to be careful not to conflict with those used by other modules + * (BUG, kprobes, etc) and the register_undef_hook() system. + * + * The ARM architecture reference manual guarantees that the following + * instruction space will produce an undefined instruction exception on + * all CPUs: + * + * ARM: xxxx 0111 1111 xxxx xxxx xxxx 1111 xxxx ARMv7-AR, section A5.4 + * Thumb: 1101 1110 xxxx xxxx ARMv7-M, section A5.2.6 + */ +#define ARM_INST_UDF 0xe7fddef1 + /* register */ #define _AL3_R(op, rd, rn, rm) ((op ## _R) | (rd) << 12 | (rn) << 16 | (rm)) /* immediate */ |