MIPS: bpf: Fix stack space allocation for BPF memwords on MIPS64

When allocating stack space for BPF memwords we need to use the appropriate 32 or 64-bit instruction to avoid losing the top 32 bits of the stack pointer. Signed-off-by: Markos Chandras <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Daniel Borkmann <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: [email protected] Cc: [email protected] Patchwork: https://patchwork.linux-mips.org/patch/7135/ Signed-off-by: Ralf Baechle <[email protected]>
patjak · Jun 26, 2014 · d8214ef · d8214ef
1 parent b6a14a9
commit d8214ef
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c
@@ -623,7 +623,10 @@ static void save_bpf_jit_regs(struct jit_ctx *ctx, unsigned offset)
 	if (ctx->flags & SEEN_MEM) {
 		if (real_off % (RSIZE * 2))
 			real_off += RSIZE;
-		emit_addiu(r_M, r_sp, real_off, ctx);
+		if (config_enabled(CONFIG_64BIT))
+			emit_daddiu(r_M, r_sp, real_off, ctx);
+		else
+			emit_addiu(r_M, r_sp, real_off, ctx);
 	}
 }