diff mbox series

[bpf-next,v2,1/6] riscv, bpf: Unify 32-bit sign-extension to emit_sextw

Message ID 20230919035839.3297328-2-pulehui@huaweicloud.com (mailing list archive)
State Handled Elsewhere, archived
Headers show
Series Zbb support and code simplification for RV64 JIT | expand

Checks

Context Check Description
conchuod/cover_letter success Series has a cover letter
conchuod/tree_selection success Guessed tree name to be for-next at HEAD 0bb80ecc33a8
conchuod/fixes_present success Fixes tag not required for -next series
conchuod/maintainers_pattern success MAINTAINERS pattern errors before the patch: 5 and now 5
conchuod/verify_signedoff success Signed-off-by tag matches author and committer
conchuod/kdoc success Errors and warnings before: 0 this patch: 0
conchuod/build_rv64_clang_allmodconfig success Errors and warnings before: 12 this patch: 12
conchuod/module_param success Was 0 now: 0
conchuod/build_rv64_gcc_allmodconfig success Errors and warnings before: 13 this patch: 13
conchuod/build_rv32_defconfig success Build OK
conchuod/dtb_warn_rv64 success Errors and warnings before: 25 this patch: 25
conchuod/header_inline success No static functions without inline keyword in header files
conchuod/checkpatch success total: 0 errors, 0 warnings, 0 checks, 45 lines checked
conchuod/build_rv64_nommu_k210_defconfig success Build OK
conchuod/verify_fixes success No Fixes tag
conchuod/build_rv64_nommu_virt_defconfig success Build OK

Commit Message

Pu Lehui Sept. 19, 2023, 3:58 a.m. UTC 
From: Pu Lehui <pulehui@huawei.com>

For code unification, add emit_sextw wrapper to unify all the 32-bit
sign-extension operations.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
---
 arch/riscv/net/bpf_jit.h        |  5 +++++
 arch/riscv/net/bpf_jit_comp64.c | 10 +++++-----
 2 files changed, 10 insertions(+), 5 deletions(-)

Comments

Björn Töpel Sept. 28, 2023, 10:45 a.m. UTC | #1 
Pu Lehui <pulehui@huaweicloud.com> writes:

> From: Pu Lehui <pulehui@huawei.com>
>
> For code unification, add emit_sextw wrapper to unify all the 32-bit
> sign-extension operations.
>
> Signed-off-by: Pu Lehui <pulehui@huawei.com>

Acked-by: Björn Töpel <bjorn@kernel.org>
diff mbox series

Patch

diff --git a/arch/riscv/net/bpf_jit.h b/arch/riscv/net/bpf_jit.h
index d21c6c92a..03a6ecb43 100644
--- a/arch/riscv/net/bpf_jit.h
+++ b/arch/riscv/net/bpf_jit.h
@@ -1084,6 +1084,11 @@  static inline void emit_subw(u8 rd, u8 rs1, u8 rs2, struct rv_jit_context *ctx)
 		emit(rv_subw(rd, rs1, rs2), ctx);
 }
 
+static inline void emit_sextw(u8 rd, u8 rs, struct rv_jit_context *ctx)
+{
+	emit_addiw(rd, rs, 0, ctx);
+}
+
 #endif /* __riscv_xlen == 64 */
 
 void bpf_jit_build_prologue(struct rv_jit_context *ctx);
diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index 8423f4ddf..8b654c0cf 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -413,8 +413,8 @@  static void emit_zext_32_rd_rs(u8 *rd, u8 *rs, struct rv_jit_context *ctx)
 
 static void emit_sext_32_rd_rs(u8 *rd, u8 *rs, struct rv_jit_context *ctx)
 {
-	emit_addiw(RV_REG_T2, *rd, 0, ctx);
-	emit_addiw(RV_REG_T1, *rs, 0, ctx);
+	emit_sextw(RV_REG_T2, *rd, ctx);
+	emit_sextw(RV_REG_T1, *rs, ctx);
 	*rd = RV_REG_T2;
 	*rs = RV_REG_T1;
 }
@@ -429,7 +429,7 @@  static void emit_zext_32_rd_t1(u8 *rd, struct rv_jit_context *ctx)
 
 static void emit_sext_32_rd(u8 *rd, struct rv_jit_context *ctx)
 {
-	emit_addiw(RV_REG_T2, *rd, 0, ctx);
+	emit_sextw(RV_REG_T2, *rd, ctx);
 	*rd = RV_REG_T2;
 }
 
@@ -1057,7 +1057,7 @@  int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
 			emit_srai(rd, RV_REG_T1, 64 - insn->off, ctx);
 			break;
 		case 32:
-			emit_addiw(rd, rs, 0, ctx);
+			emit_sextw(rd, rs, ctx);
 			break;
 		}
 		if (!is64 && !aux->verifier_zext)
@@ -1457,7 +1457,7 @@  int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
 		 * as t1 is used only in comparison against zero.
 		 */
 		if (!is64 && imm < 0)
-			emit_addiw(RV_REG_T1, RV_REG_T1, 0, ctx);
+			emit_sextw(RV_REG_T1, RV_REG_T1, ctx);
 		e = ctx->ninsns;
 		rvoff -= ninsns_rvoff(e - s);
 		emit_branch(BPF_JNE, RV_REG_T1, RV_REG_ZERO, rvoff, ctx);