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[PATCH/RFC,bpf-next,11/16] sparc: bpf: eliminate zero extension code-gen

Message ID 1553623539-15474-12-git-send-email-jiong.wang@netronome.com
State RFC
Delegated to: BPF Maintainers
Headers show
Series bpf: eliminate zero extensions for sub-register writes | expand

Commit Message

Jiong Wang March 26, 2019, 6:05 p.m. UTC 
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
---
 arch/sparc/net/bpf_jit_comp_64.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/sparc/net/bpf_jit_comp_64.c b/arch/sparc/net/bpf_jit_comp_64.c
index 65428e7..e58f84e 100644
--- a/arch/sparc/net/bpf_jit_comp_64.c
+++ b/arch/sparc/net/bpf_jit_comp_64.c
@@ -1144,7 +1144,8 @@  static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
 		break;
 
 	do_alu32_trunc:
-		if (BPF_CLASS(code) == BPF_ALU)
+		if (BPF_CLASS(code) == BPF_ALU &&
+		    ctx->prog->aux->no_verifier_zext)
 			emit_alu_K(SRL, dst, 0, ctx);
 		break;
 
@@ -1432,6 +1433,11 @@  static void jit_fill_hole(void *area, unsigned int size)
 		*ptr++ = 0x91d02005; /* ta 5 */
 }
 
+bool bpf_jit_hardware_zext(void)
+{
+	return false;
+}
+
 struct sparc64_jit_data {
 	struct bpf_binary_header *header;
 	u8 *image;