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[bpf-next,v3,04/12] bpf: sparc64: Emit fixed-length instructions for BPF_PSEUDO_FUNC

Message ID 20230222223714.80671-5-iii@linux.ibm.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpf: Support 64-bit pointers to kfuncs | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR fail PR summary
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 11 maintainers not CCed: john.fastabend@gmail.com linux-riscv@lists.infradead.org palmer@dabbelt.com sparclinux@vger.kernel.org song@kernel.org martin.lau@linux.dev paul.walmsley@sifive.com haoluo@google.com yhs@fb.com aou@eecs.berkeley.edu kpsingh@kernel.org
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 21 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-VM_Test-9 success Logs for test_maps on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-10 success Logs for test_maps on aarch64 with llvm-17
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Commit Message

Ilya Leoshkevich Feb. 22, 2023, 10:37 p.m. UTC 
This is the same as commit b54b6003612a ("riscv, bpf: Emit fixed-length
instructions for BPF_PSEUDO_FUNC"), but for sparc64. The code sequence
is borrowed from sparc64-linux-gnu-gcc -Os.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 arch/sparc/net/bpf_jit_comp_64.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/sparc/net/bpf_jit_comp_64.c b/arch/sparc/net/bpf_jit_comp_64.c
index fa0759bfe498..59d2d9953aa7 100644
--- a/arch/sparc/net/bpf_jit_comp_64.c
+++ b/arch/sparc/net/bpf_jit_comp_64.c
@@ -1243,10 +1243,19 @@  static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
 	case BPF_LD | BPF_IMM | BPF_DW:
 	{
 		const struct bpf_insn insn1 = insn[1];
+		const u8 tmp = bpf2sparc[TMP_REG_1];
 		u64 imm64;
 
-		imm64 = (u64)insn1.imm << 32 | (u32)imm;
-		emit_loadimm64(imm64, dst, ctx);
+		if (bpf_pseudo_func(insn)) {
+			/* fixed-length insns for extra jit pass */
+			emit_set_const(dst, insn1.imm, ctx);
+			emit_set_const(tmp, imm, ctx);
+			emit_alu_K(SLLX, dst, 32, ctx);
+			emit_alu3(ADD, dst, tmp, dst, ctx);
+		} else {
+			imm64 = (u64)insn1.imm << 32 | (u32)imm;
+			emit_loadimm64(imm64, dst, ctx);
+		}
 
 		return 1;
 	}