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Commit 44cf43c0 authored by Jiong Wang's avatar Jiong Wang Committed by Alexei Starovoitov
Browse files

ppc: bpf: implement jitting of BPF_ALU | BPF_ARSH | BPF_* 



This patch implements code-gen for BPF_ALU | BPF_ARSH | BPF_*.

Cc: Naveen N. Rao <naveen.n.rao@linux.ibm.com>
Cc: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: default avatarJiong Wang <jiong.wang@netronome.com>
Reviewed-by: default avatarSandipan Das <sandipan@linux.ibm.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent ee94b90c

arch/powerpc/include/asm/ppc-opcode.h

+2 −0
Original line number Diff line number Diff line
@@ -342,6 +342,8 @@ 
#define PPC_INST_SLW			0x7c000030

#define PPC_INST_SLD			0x7c000036

#define PPC_INST_SRW			0x7c000430

#define PPC_INST_SRAW			0x7c000630

#define PPC_INST_SRAWI			0x7c000670

#define PPC_INST_SRD			0x7c000436

#define PPC_INST_SRAD			0x7c000634

#define PPC_INST_SRADI			0x7c000674

arch/powerpc/net/bpf_jit.h

+4 −0
Original line number Diff line number Diff line
@@ -152,6 +152,10 @@ 
				     ___PPC_RS(a) | ___PPC_RB(s))

#define PPC_SRW(d, a, s)	EMIT(PPC_INST_SRW | ___PPC_RA(d) |	      \

				     ___PPC_RS(a) | ___PPC_RB(s))

#define PPC_SRAW(d, a, s)	EMIT(PPC_INST_SRAW | ___PPC_RA(d) |	      \

				     ___PPC_RS(a) | ___PPC_RB(s))

#define PPC_SRAWI(d, a, i)	EMIT(PPC_INST_SRAWI | ___PPC_RA(d) |	      \

				     ___PPC_RS(a) | __PPC_SH(i))

#define PPC_SRD(d, a, s)	EMIT(PPC_INST_SRD | ___PPC_RA(d) |	      \

				     ___PPC_RS(a) | ___PPC_RB(s))

#define PPC_SRAD(d, a, s)	EMIT(PPC_INST_SRAD | ___PPC_RA(d) |	      \

arch/powerpc/net/bpf_jit_comp64.c

+6 −0
Original line number Diff line number Diff line
@@ -529,9 +529,15 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, 
			if (imm != 0)

				PPC_SRDI(dst_reg, dst_reg, imm);

			break;

		case BPF_ALU | BPF_ARSH | BPF_X: /* (s32) dst >>= src */

			PPC_SRAW(dst_reg, dst_reg, src_reg);

			goto bpf_alu32_trunc;

		case BPF_ALU64 | BPF_ARSH | BPF_X: /* (s64) dst >>= src */

			PPC_SRAD(dst_reg, dst_reg, src_reg);

			break;

		case BPF_ALU | BPF_ARSH | BPF_K: /* (s32) dst >>= imm */

			PPC_SRAWI(dst_reg, dst_reg, imm);

			goto bpf_alu32_trunc;

		case BPF_ALU64 | BPF_ARSH | BPF_K: /* (s64) dst >>= imm */

			if (imm != 0)

				PPC_SRADI(dst_reg, dst_reg, imm);