bpf, arm: remove obsolete exception handling from div/mod

Since we've changed div/mod exception handling for src_reg in eBPF verifier itself, remove the leftovers from arm32 JIT. Signed-off-by: Daniel Borkmann <[email protected]> Cc: Shubham Bansal <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]>
josf · Jan 27, 2018 · 73ae3c0 · 73ae3c0
1 parent e472d5d
commit 73ae3c0
Showing 1 changed file with 0 additions and 8 deletions.
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
@@ -363,15 +363,7 @@ static inline int epilogue_offset(const struct jit_ctx *ctx)
 static inline void emit_udivmod(u8 rd, u8 rm, u8 rn, struct jit_ctx *ctx, u8 op)
 {
 	const u8 *tmp = bpf2a32[TMP_REG_1];
-	s32 jmp_offset;
 
-	/* checks if divisor is zero or not. If it is, then
-	 * exit directly.
-	 */
-	emit(ARM_CMP_I(rn, 0), ctx);
-	_emit(ARM_COND_EQ, ARM_MOV_I(ARM_R0, 0), ctx);
-	jmp_offset = epilogue_offset(ctx);
-	_emit(ARM_COND_EQ, ARM_B(jmp_offset), ctx);
 #if __LINUX_ARM_ARCH__ == 7
 	if (elf_hwcap & HWCAP_IDIVA) {
 		if (op == BPF_DIV)