diff options
| -rw-r--r-- | arch/arm/net/bpf_jit_32.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index b18fb70c5dcf..e13aca6e6d4b 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -796,7 +796,11 @@ static inline void emit_a32_rsh_i64(const u8 dst[], bool dstk, } /* Do LSR operation */ - if (val < 32) { + if (val == 0) { + /* An immediate value of 0 encodes a shift amount of 32 + * for LSR. To shift by 0, don't do anything. + */ + } else if (val < 32) { emit(ARM_MOV_SI(tmp2[1], rd, SRTYPE_LSR, val), ctx); emit(ARM_ORR_SI(rd, tmp2[1], rm, SRTYPE_ASL, 32 - val), ctx); emit(ARM_MOV_SI(rm, rm, SRTYPE_LSR, val), ctx); @@ -829,7 +833,11 @@ static inline void emit_a32_arsh_i64(const u8 dst[], bool dstk, } /* Do ARSH operation */ - if (val < 32) { + if (val == 0) { + /* An immediate value of 0 encodes a shift amount of 32 + * for ASR. To shift by 0, don't do anything. + */ + } else if (val < 32) { emit(ARM_MOV_SI(tmp2[1], rd, SRTYPE_LSR, val), ctx); emit(ARM_ORR_SI(rd, tmp2[1], rm, SRTYPE_ASL, 32 - val), ctx); emit(ARM_MOV_SI(rm, rm, SRTYPE_ASR, val), ctx); |