Eric Lee / smarc-fsl-linux-kernel

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samples/bpf/bpf_insn.h 5.43 KB
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b24413180   Greg Kroah-Hartman   License cleanup: ... 
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  /* SPDX-License-Identifier: GPL-2.0 */
8d9304507   Jakub Kicinski   samples: bpf: ren... 
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  /* eBPF instruction mini library */
  #ifndef __BPF_INSN_H
  #define __BPF_INSN_H
3c731eba4   Alexei Starovoitov   bpf: mini eBPF li... 
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 Joe Stringer
 
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  struct bpf_insn;









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 Alexei Starovoitov
 
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  /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
  
  #define BPF_ALU64_REG(OP, DST, SRC)				\
  	((struct bpf_insn) {					\
  		.code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,	\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = 0,					\
  		.imm   = 0 })
  
  #define BPF_ALU32_REG(OP, DST, SRC)				\
  	((struct bpf_insn) {					\
  		.code  = BPF_ALU | BPF_OP(OP) | BPF_X,		\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = 0,					\
  		.imm   = 0 })
  
  /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
  
  #define BPF_ALU64_IMM(OP, DST, IMM)				\
  	((struct bpf_insn) {					\
  		.code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,	\
  		.dst_reg = DST,					\
  		.src_reg = 0,					\
  		.off   = 0,					\
  		.imm   = IMM })
  
  #define BPF_ALU32_IMM(OP, DST, IMM)				\
  	((struct bpf_insn) {					\
  		.code  = BPF_ALU | BPF_OP(OP) | BPF_K,		\
  		.dst_reg = DST,					\
  		.src_reg = 0,					\
  		.off   = 0,					\
  		.imm   = IMM })
  
  /* Short form of mov, dst_reg = src_reg */
  
  #define BPF_MOV64_REG(DST, SRC)					\
  	((struct bpf_insn) {					\
  		.code  = BPF_ALU64 | BPF_MOV | BPF_X,		\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = 0,					\
  		.imm   = 0 })









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 Alexei Starovoitov
 
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  #define BPF_MOV32_REG(DST, SRC)					\
  	((struct bpf_insn) {					\
  		.code  = BPF_ALU | BPF_MOV | BPF_X,		\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = 0,					\
  		.imm   = 0 })









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 Alexei Starovoitov
 
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  /* Short form of mov, dst_reg = imm32 */
  
  #define BPF_MOV64_IMM(DST, IMM)					\
  	((struct bpf_insn) {					\
  		.code  = BPF_ALU64 | BPF_MOV | BPF_K,		\
  		.dst_reg = DST,					\
  		.src_reg = 0,					\
  		.off   = 0,					\









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  		.imm   = IMM })
  
  #define BPF_MOV32_IMM(DST, IMM)					\
  	((struct bpf_insn) {					\
  		.code  = BPF_ALU | BPF_MOV | BPF_K,		\
  		.dst_reg = DST,					\
  		.src_reg = 0,					\
  		.off   = 0,					\









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  		.imm   = IMM })
  
  /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
  #define BPF_LD_IMM64(DST, IMM)					\
  	BPF_LD_IMM64_RAW(DST, 0, IMM)
  
  #define BPF_LD_IMM64_RAW(DST, SRC, IMM)				\
  	((struct bpf_insn) {					\
  		.code  = BPF_LD | BPF_DW | BPF_IMM,		\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = 0,					\
  		.imm   = (__u32) (IMM) }),			\
  	((struct bpf_insn) {					\
  		.code  = 0, /* zero is reserved opcode */	\
  		.dst_reg = 0,					\
  		.src_reg = 0,					\
  		.off   = 0,					\
  		.imm   = ((__u64) (IMM)) >> 32 })









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  #ifndef BPF_PSEUDO_MAP_FD
  # define BPF_PSEUDO_MAP_FD	1
  #endif









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  /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
  #define BPF_LD_MAP_FD(DST, MAP_FD)				\
  	BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)









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  /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
  
  #define BPF_LD_ABS(SIZE, IMM)					\
  	((struct bpf_insn) {					\
  		.code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,	\
  		.dst_reg = 0,					\
  		.src_reg = 0,					\
  		.off   = 0,					\
  		.imm   = IMM })









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  /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
  
  #define BPF_LDX_MEM(SIZE, DST, SRC, OFF)			\
  	((struct bpf_insn) {					\
  		.code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,	\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = OFF,					\
  		.imm   = 0 })
  
  /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
  
  #define BPF_STX_MEM(SIZE, DST, SRC, OFF)			\
  	((struct bpf_insn) {					\
  		.code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,	\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = OFF,					\
  		.imm   = 0 })









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  /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
  
  #define BPF_STX_XADD(SIZE, DST, SRC, OFF)			\
  	((struct bpf_insn) {					\
  		.code  = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD,	\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = OFF,					\
  		.imm   = 0 })









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 Alexei Starovoitov
 
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  /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
  
  #define BPF_ST_MEM(SIZE, DST, OFF, IMM)				\
  	((struct bpf_insn) {					\
  		.code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,	\
  		.dst_reg = DST,					\
  		.src_reg = 0,					\
  		.off   = OFF,					\
  		.imm   = IMM })
  
  /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
  
  #define BPF_JMP_REG(OP, DST, SRC, OFF)				\
  	((struct bpf_insn) {					\
  		.code  = BPF_JMP | BPF_OP(OP) | BPF_X,		\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = OFF,					\
  		.imm   = 0 })









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  /* Like BPF_JMP_REG, but with 32-bit wide operands for comparison. */
  
  #define BPF_JMP32_REG(OP, DST, SRC, OFF)			\
  	((struct bpf_insn) {					\
  		.code  = BPF_JMP32 | BPF_OP(OP) | BPF_X,	\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = OFF,					\
  		.imm   = 0 })









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 Alexei Starovoitov
 
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  /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
  
  #define BPF_JMP_IMM(OP, DST, IMM, OFF)				\
  	((struct bpf_insn) {					\
  		.code  = BPF_JMP | BPF_OP(OP) | BPF_K,		\
  		.dst_reg = DST,					\
  		.src_reg = 0,					\
  		.off   = OFF,					\
  		.imm   = IMM })









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 Jiong Wang
 
selftests: bpf: f...




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  /* Like BPF_JMP_IMM, but with 32-bit wide operands for comparison. */
  
  #define BPF_JMP32_IMM(OP, DST, IMM, OFF)			\
  	((struct bpf_insn) {					\
  		.code  = BPF_JMP32 | BPF_OP(OP) | BPF_K,	\
  		.dst_reg = DST,					\
  		.src_reg = 0,					\
  		.off   = OFF,					\
  		.imm   = IMM })









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 Alexei Starovoitov
 
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  /* Raw code statement block */
  
  #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)			\
  	((struct bpf_insn) {					\
  		.code  = CODE,					\
  		.dst_reg = DST,					\
  		.src_reg = SRC,					\
  		.off   = OFF,					\
  		.imm   = IMM })
  
  /* Program exit */
  
  #define BPF_EXIT_INSN()						\
  	((struct bpf_insn) {					\
  		.code  = BPF_JMP | BPF_EXIT,			\
  		.dst_reg = 0,					\
  		.src_reg = 0,					\
  		.off   = 0,					\
  		.imm   = 0 })
  
  #endif